source backends/Kconfig
source accel/Kconfig
source hw/Kconfig
+source semihosting/Kconfig
Semihosting
M: Alex Bennée <alex.bennee@linaro.org>
S: Maintained
-F: hw/semihosting/
+F: semihosting/
F: include/semihosting/
Multi-process QEMU
source rtc/Kconfig
source scsi/Kconfig
source sd/Kconfig
-source semihosting/Kconfig
source smbios/Kconfig
source ssi/Kconfig
source timer/Kconfig
subdir('rtc')
subdir('scsi')
subdir('sd')
-subdir('semihosting')
subdir('smbios')
subdir('ssi')
subdir('timer')
+++ /dev/null
-
-config SEMIHOSTING
- bool
-
-config ARM_COMPATIBLE_SEMIHOSTING
- bool
- select SEMIHOSTING
+++ /dev/null
-/*
- * Semihosting support for systems modeled on the Arm "Angel"
- * semihosting syscalls design. This includes Arm and RISC-V processors
- *
- * Copyright (c) 2005, 2007 CodeSourcery.
- * Copyright (c) 2019 Linaro
- * Written by Paul Brook.
- *
- * Copyright © 2020 by Keith Packard <keithp@keithp.com>
- * Adapted for systems other than ARM, including RISC-V, by Keith Packard
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
- *
- * ARM Semihosting is documented in:
- * Semihosting for AArch32 and AArch64 Release 2.0
- * https://static.docs.arm.com/100863/0200/semihosting.pdf
- *
- * RISC-V Semihosting is documented in:
- * RISC-V Semihosting
- * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
- */
-
-#include "qemu/osdep.h"
-
-#include "cpu.h"
-#include "semihosting/semihost.h"
-#include "semihosting/console.h"
-#include "semihosting/common-semi.h"
-#include "qemu/log.h"
-#include "qemu/timer.h"
-#ifdef CONFIG_USER_ONLY
-#include "qemu.h"
-
-#define COMMON_SEMI_HEAP_SIZE (128 * 1024 * 1024)
-#else
-#include "exec/gdbstub.h"
-#include "qemu/cutils.h"
-#ifdef TARGET_ARM
-#include "hw/arm/boot.h"
-#endif
-#include "hw/boards.h"
-#endif
-
-#define TARGET_SYS_OPEN 0x01
-#define TARGET_SYS_CLOSE 0x02
-#define TARGET_SYS_WRITEC 0x03
-#define TARGET_SYS_WRITE0 0x04
-#define TARGET_SYS_WRITE 0x05
-#define TARGET_SYS_READ 0x06
-#define TARGET_SYS_READC 0x07
-#define TARGET_SYS_ISERROR 0x08
-#define TARGET_SYS_ISTTY 0x09
-#define TARGET_SYS_SEEK 0x0a
-#define TARGET_SYS_FLEN 0x0c
-#define TARGET_SYS_TMPNAM 0x0d
-#define TARGET_SYS_REMOVE 0x0e
-#define TARGET_SYS_RENAME 0x0f
-#define TARGET_SYS_CLOCK 0x10
-#define TARGET_SYS_TIME 0x11
-#define TARGET_SYS_SYSTEM 0x12
-#define TARGET_SYS_ERRNO 0x13
-#define TARGET_SYS_GET_CMDLINE 0x15
-#define TARGET_SYS_HEAPINFO 0x16
-#define TARGET_SYS_EXIT 0x18
-#define TARGET_SYS_SYNCCACHE 0x19
-#define TARGET_SYS_EXIT_EXTENDED 0x20
-#define TARGET_SYS_ELAPSED 0x30
-#define TARGET_SYS_TICKFREQ 0x31
-
-/* ADP_Stopped_ApplicationExit is used for exit(0),
- * anything else is implemented as exit(1) */
-#define ADP_Stopped_ApplicationExit (0x20026)
-
-#ifndef O_BINARY
-#define O_BINARY 0
-#endif
-
-#define GDB_O_RDONLY 0x000
-#define GDB_O_WRONLY 0x001
-#define GDB_O_RDWR 0x002
-#define GDB_O_APPEND 0x008
-#define GDB_O_CREAT 0x200
-#define GDB_O_TRUNC 0x400
-#define GDB_O_BINARY 0
-
-static int gdb_open_modeflags[12] = {
- GDB_O_RDONLY,
- GDB_O_RDONLY | GDB_O_BINARY,
- GDB_O_RDWR,
- GDB_O_RDWR | GDB_O_BINARY,
- GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC,
- GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
- GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC,
- GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
- GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND,
- GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY,
- GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND,
- GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY
-};
-
-static int open_modeflags[12] = {
- O_RDONLY,
- O_RDONLY | O_BINARY,
- O_RDWR,
- O_RDWR | O_BINARY,
- O_WRONLY | O_CREAT | O_TRUNC,
- O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
- O_RDWR | O_CREAT | O_TRUNC,
- O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
- O_WRONLY | O_CREAT | O_APPEND,
- O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
- O_RDWR | O_CREAT | O_APPEND,
- O_RDWR | O_CREAT | O_APPEND | O_BINARY
-};
-
-typedef enum GuestFDType {
- GuestFDUnused = 0,
- GuestFDHost = 1,
- GuestFDGDB = 2,
- GuestFDFeatureFile = 3,
-} GuestFDType;
-
-/*
- * Guest file descriptors are integer indexes into an array of
- * these structures (we will dynamically resize as necessary).
- */
-typedef struct GuestFD {
- GuestFDType type;
- union {
- int hostfd;
- target_ulong featurefile_offset;
- };
-} GuestFD;
-
-static GArray *guestfd_array;
-
-#ifndef CONFIG_USER_ONLY
-#include "exec/address-spaces.h"
-/*
- * Find the base of a RAM region containing the specified address
- */
-static inline hwaddr
-common_semi_find_region_base(hwaddr addr)
-{
- MemoryRegion *subregion;
-
- /*
- * Find the chunk of R/W memory containing the address. This is
- * used for the SYS_HEAPINFO semihosting call, which should
- * probably be using information from the loaded application.
- */
- QTAILQ_FOREACH(subregion, &get_system_memory()->subregions,
- subregions_link) {
- if (subregion->ram && !subregion->readonly) {
- Int128 top128 = int128_add(int128_make64(subregion->addr),
- subregion->size);
- Int128 addr128 = int128_make64(addr);
- if (subregion->addr <= addr && int128_lt(addr128, top128)) {
- return subregion->addr;
- }
- }
- }
- return 0;
-}
-#endif
-
-#ifdef TARGET_ARM
-static inline target_ulong
-common_semi_arg(CPUState *cs, int argno)
-{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
- if (is_a64(env)) {
- return env->xregs[argno];
- } else {
- return env->regs[argno];
- }
-}
-
-static inline void
-common_semi_set_ret(CPUState *cs, target_ulong ret)
-{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
- if (is_a64(env)) {
- env->xregs[0] = ret;
- } else {
- env->regs[0] = ret;
- }
-}
-
-static inline bool
-common_semi_sys_exit_extended(CPUState *cs, int nr)
-{
- return (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(cs->env_ptr));
-}
-
-#ifndef CONFIG_USER_ONLY
-#include "hw/arm/boot.h"
-static inline target_ulong
-common_semi_rambase(CPUState *cs)
-{
- CPUArchState *env = cs->env_ptr;
- const struct arm_boot_info *info = env->boot_info;
- target_ulong sp;
-
- if (info) {
- return info->loader_start;
- }
-
- if (is_a64(env)) {
- sp = env->xregs[31];
- } else {
- sp = env->regs[13];
- }
- return common_semi_find_region_base(sp);
-}
-#endif
-
-#endif /* TARGET_ARM */
-
-#ifdef TARGET_RISCV
-static inline target_ulong
-common_semi_arg(CPUState *cs, int argno)
-{
- RISCVCPU *cpu = RISCV_CPU(cs);
- CPURISCVState *env = &cpu->env;
- return env->gpr[xA0 + argno];
-}
-
-static inline void
-common_semi_set_ret(CPUState *cs, target_ulong ret)
-{
- RISCVCPU *cpu = RISCV_CPU(cs);
- CPURISCVState *env = &cpu->env;
- env->gpr[xA0] = ret;
-}
-
-static inline bool
-common_semi_sys_exit_extended(CPUState *cs, int nr)
-{
- return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8);
-}
-
-#ifndef CONFIG_USER_ONLY
-
-static inline target_ulong
-common_semi_rambase(CPUState *cs)
-{
- RISCVCPU *cpu = RISCV_CPU(cs);
- CPURISCVState *env = &cpu->env;
- return common_semi_find_region_base(env->gpr[xSP]);
-}
-#endif
-
-#endif
-
-/*
- * Allocate a new guest file descriptor and return it; if we
- * couldn't allocate a new fd then return -1.
- * This is a fairly simplistic implementation because we don't
- * expect that most semihosting guest programs will make very
- * heavy use of opening and closing fds.
- */
-static int alloc_guestfd(void)
-{
- guint i;
-
- if (!guestfd_array) {
- /* New entries zero-initialized, i.e. type GuestFDUnused */
- guestfd_array = g_array_new(FALSE, TRUE, sizeof(GuestFD));
- }
-
- /* SYS_OPEN should return nonzero handle on success. Start guestfd from 1 */
- for (i = 1; i < guestfd_array->len; i++) {
- GuestFD *gf = &g_array_index(guestfd_array, GuestFD, i);
-
- if (gf->type == GuestFDUnused) {
- return i;
- }
- }
-
- /* All elements already in use: expand the array */
- g_array_set_size(guestfd_array, i + 1);
- return i;
-}
-
-/*
- * Look up the guestfd in the data structure; return NULL
- * for out of bounds, but don't check whether the slot is unused.
- * This is used internally by the other guestfd functions.
- */
-static GuestFD *do_get_guestfd(int guestfd)
-{
- if (!guestfd_array) {
- return NULL;
- }
-
- if (guestfd <= 0 || guestfd >= guestfd_array->len) {
- return NULL;
- }
-
- return &g_array_index(guestfd_array, GuestFD, guestfd);
-}
-
-/*
- * Associate the specified guest fd (which must have been
- * allocated via alloc_fd() and not previously used) with
- * the specified host/gdb fd.
- */
-static void associate_guestfd(int guestfd, int hostfd)
-{
- GuestFD *gf = do_get_guestfd(guestfd);
-
- assert(gf);
- gf->type = use_gdb_syscalls() ? GuestFDGDB : GuestFDHost;
- gf->hostfd = hostfd;
-}
-
-/*
- * Deallocate the specified guest file descriptor. This doesn't
- * close the host fd, it merely undoes the work of alloc_fd().
- */
-static void dealloc_guestfd(int guestfd)
-{
- GuestFD *gf = do_get_guestfd(guestfd);
-
- assert(gf);
- gf->type = GuestFDUnused;
-}
-
-/*
- * Given a guest file descriptor, get the associated struct.
- * If the fd is not valid, return NULL. This is the function
- * used by the various semihosting calls to validate a handle
- * from the guest.
- * Note: calling alloc_guestfd() or dealloc_guestfd() will
- * invalidate any GuestFD* obtained by calling this function.
- */
-static GuestFD *get_guestfd(int guestfd)
-{
- GuestFD *gf = do_get_guestfd(guestfd);
-
- if (!gf || gf->type == GuestFDUnused) {
- return NULL;
- }
- return gf;
-}
-
-/*
- * The semihosting API has no concept of its errno being thread-safe,
- * as the API design predates SMP CPUs and was intended as a simple
- * real-hardware set of debug functionality. For QEMU, we make the
- * errno be per-thread in linux-user mode; in softmmu it is a simple
- * global, and we assume that the guest takes care of avoiding any races.
- */
-#ifndef CONFIG_USER_ONLY
-static target_ulong syscall_err;
-
-#include "exec/softmmu-semi.h"
-#endif
-
-static inline uint32_t set_swi_errno(CPUState *cs, uint32_t code)
-{
- if (code == (uint32_t)-1) {
-#ifdef CONFIG_USER_ONLY
- TaskState *ts = cs->opaque;
-
- ts->swi_errno = errno;
-#else
- syscall_err = errno;
-#endif
- }
- return code;
-}
-
-static inline uint32_t get_swi_errno(CPUState *cs)
-{
-#ifdef CONFIG_USER_ONLY
- TaskState *ts = cs->opaque;
-
- return ts->swi_errno;
-#else
- return syscall_err;
-#endif
-}
-
-static target_ulong common_semi_syscall_len;
-
-static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
-{
- target_ulong reg0 = common_semi_arg(cs, 0);
-
- if (ret == (target_ulong)-1) {
- errno = err;
- set_swi_errno(cs, -1);
- reg0 = ret;
- } else {
- /* Fixup syscalls that use nonstardard return conventions. */
- switch (reg0) {
- case TARGET_SYS_WRITE:
- case TARGET_SYS_READ:
- reg0 = common_semi_syscall_len - ret;
- break;
- case TARGET_SYS_SEEK:
- reg0 = 0;
- break;
- default:
- reg0 = ret;
- break;
- }
- }
- common_semi_set_ret(cs, reg0);
-}
-
-static target_ulong common_semi_flen_buf(CPUState *cs)
-{
- target_ulong sp;
-#ifdef TARGET_ARM
- /* Return an address in target memory of 64 bytes where the remote
- * gdb should write its stat struct. (The format of this structure
- * is defined by GDB's remote protocol and is not target-specific.)
- * We put this on the guest's stack just below SP.
- */
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
-
- if (is_a64(env)) {
- sp = env->xregs[31];
- } else {
- sp = env->regs[13];
- }
-#endif
-#ifdef TARGET_RISCV
- RISCVCPU *cpu = RISCV_CPU(cs);
- CPURISCVState *env = &cpu->env;
-
- sp = env->gpr[xSP];
-#endif
-
- return sp - 64;
-}
-
-static void
-common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
-{
- /* The size is always stored in big-endian order, extract
- the value. We assume the size always fit in 32 bits. */
- uint32_t size;
- cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) + 32,
- (uint8_t *)&size, 4, 0);
- size = be32_to_cpu(size);
- common_semi_set_ret(cs, size);
- errno = err;
- set_swi_errno(cs, -1);
-}
-
-static int common_semi_open_guestfd;
-
-static void
-common_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
-{
- if (ret == (target_ulong)-1) {
- errno = err;
- set_swi_errno(cs, -1);
- dealloc_guestfd(common_semi_open_guestfd);
- } else {
- associate_guestfd(common_semi_open_guestfd, ret);
- ret = common_semi_open_guestfd;
- }
- common_semi_set_ret(cs, ret);
-}
-
-static target_ulong
-common_semi_gdb_syscall(CPUState *cs, gdb_syscall_complete_cb cb,
- const char *fmt, ...)
-{
- va_list va;
-
- va_start(va, fmt);
- gdb_do_syscallv(cb, fmt, va);
- va_end(va);
-
- /*
- * FIXME: in softmmu mode, the gdbstub will schedule our callback
- * to occur, but will not actually call it to complete the syscall
- * until after this function has returned and we are back in the
- * CPU main loop. Therefore callers to this function must not
- * do anything with its return value, because it is not necessarily
- * the result of the syscall, but could just be the old value of X0.
- * The only thing safe to do with this is that the callers of
- * do_common_semihosting() will write it straight back into X0.
- * (In linux-user mode, the callback will have happened before
- * gdb_do_syscallv() returns.)
- *
- * We should tidy this up so neither this function nor
- * do_common_semihosting() return a value, so the mistake of
- * doing something with the return value is not possible to make.
- */
-
- return common_semi_arg(cs, 0);
-}
-
-/*
- * Types for functions implementing various semihosting calls
- * for specific types of guest file descriptor. These must all
- * do the work and return the required return value for the guest,
- * setting the guest errno if appropriate.
- */
-typedef uint32_t sys_closefn(CPUState *cs, GuestFD *gf);
-typedef uint32_t sys_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len);
-typedef uint32_t sys_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len);
-typedef uint32_t sys_isattyfn(CPUState *cs, GuestFD *gf);
-typedef uint32_t sys_seekfn(CPUState *cs, GuestFD *gf,
- target_ulong offset);
-typedef uint32_t sys_flenfn(CPUState *cs, GuestFD *gf);
-
-static uint32_t host_closefn(CPUState *cs, GuestFD *gf)
-{
- /*
- * Only close the underlying host fd if it's one we opened on behalf
- * of the guest in SYS_OPEN.
- */
- if (gf->hostfd == STDIN_FILENO ||
- gf->hostfd == STDOUT_FILENO ||
- gf->hostfd == STDERR_FILENO) {
- return 0;
- }
- return set_swi_errno(cs, close(gf->hostfd));
-}
-
-static uint32_t host_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- CPUArchState *env = cs->env_ptr;
- uint32_t ret;
- char *s = lock_user(VERIFY_READ, buf, len, 1);
- (void) env; /* Used in arm softmmu lock_user implicitly */
- if (!s) {
- /* Return bytes not written on error */
- return len;
- }
- ret = set_swi_errno(cs, write(gf->hostfd, s, len));
- unlock_user(s, buf, 0);
- if (ret == (uint32_t)-1) {
- ret = 0;
- }
- /* Return bytes not written */
- return len - ret;
-}
-
-static uint32_t host_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- CPUArchState *env = cs->env_ptr;
- uint32_t ret;
- char *s = lock_user(VERIFY_WRITE, buf, len, 0);
- (void) env; /* Used in arm softmmu lock_user implicitly */
- if (!s) {
- /* return bytes not read */
- return len;
- }
- do {
- ret = set_swi_errno(cs, read(gf->hostfd, s, len));
- } while (ret == -1 && errno == EINTR);
- unlock_user(s, buf, len);
- if (ret == (uint32_t)-1) {
- ret = 0;
- }
- /* Return bytes not read */
- return len - ret;
-}
-
-static uint32_t host_isattyfn(CPUState *cs, GuestFD *gf)
-{
- return isatty(gf->hostfd);
-}
-
-static uint32_t host_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
-{
- uint32_t ret = set_swi_errno(cs, lseek(gf->hostfd, offset, SEEK_SET));
- if (ret == (uint32_t)-1) {
- return -1;
- }
- return 0;
-}
-
-static uint32_t host_flenfn(CPUState *cs, GuestFD *gf)
-{
- struct stat buf;
- uint32_t ret = set_swi_errno(cs, fstat(gf->hostfd, &buf));
- if (ret == (uint32_t)-1) {
- return -1;
- }
- return buf.st_size;
-}
-
-static uint32_t gdb_closefn(CPUState *cs, GuestFD *gf)
-{
- return common_semi_gdb_syscall(cs, common_semi_cb, "close,%x", gf->hostfd);
-}
-
-static uint32_t gdb_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- common_semi_syscall_len = len;
- return common_semi_gdb_syscall(cs, common_semi_cb, "write,%x,%x,%x",
- gf->hostfd, buf, len);
-}
-
-static uint32_t gdb_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- common_semi_syscall_len = len;
- return common_semi_gdb_syscall(cs, common_semi_cb, "read,%x,%x,%x",
- gf->hostfd, buf, len);
-}
-
-static uint32_t gdb_isattyfn(CPUState *cs, GuestFD *gf)
-{
- return common_semi_gdb_syscall(cs, common_semi_cb, "isatty,%x", gf->hostfd);
-}
-
-static uint32_t gdb_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
-{
- return common_semi_gdb_syscall(cs, common_semi_cb, "lseek,%x,%x,0",
- gf->hostfd, offset);
-}
-
-static uint32_t gdb_flenfn(CPUState *cs, GuestFD *gf)
-{
- return common_semi_gdb_syscall(cs, common_semi_flen_cb, "fstat,%x,%x",
- gf->hostfd, common_semi_flen_buf(cs));
-}
-
-#define SHFB_MAGIC_0 0x53
-#define SHFB_MAGIC_1 0x48
-#define SHFB_MAGIC_2 0x46
-#define SHFB_MAGIC_3 0x42
-
-/* Feature bits reportable in feature byte 0 */
-#define SH_EXT_EXIT_EXTENDED (1 << 0)
-#define SH_EXT_STDOUT_STDERR (1 << 1)
-
-static const uint8_t featurefile_data[] = {
- SHFB_MAGIC_0,
- SHFB_MAGIC_1,
- SHFB_MAGIC_2,
- SHFB_MAGIC_3,
- SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */
-};
-
-static void init_featurefile_guestfd(int guestfd)
-{
- GuestFD *gf = do_get_guestfd(guestfd);
-
- assert(gf);
- gf->type = GuestFDFeatureFile;
- gf->featurefile_offset = 0;
-}
-
-static uint32_t featurefile_closefn(CPUState *cs, GuestFD *gf)
-{
- /* Nothing to do */
- return 0;
-}
-
-static uint32_t featurefile_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- /* This fd can never be open for writing */
-
- errno = EBADF;
- return set_swi_errno(cs, -1);
-}
-
-static uint32_t featurefile_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- CPUArchState *env = cs->env_ptr;
- uint32_t i;
- char *s;
-
- (void) env; /* Used in arm softmmu lock_user implicitly */
- s = lock_user(VERIFY_WRITE, buf, len, 0);
- if (!s) {
- return len;
- }
-
- for (i = 0; i < len; i++) {
- if (gf->featurefile_offset >= sizeof(featurefile_data)) {
- break;
- }
- s[i] = featurefile_data[gf->featurefile_offset];
- gf->featurefile_offset++;
- }
-
- unlock_user(s, buf, len);
-
- /* Return number of bytes not read */
- return len - i;
-}
-
-static uint32_t featurefile_isattyfn(CPUState *cs, GuestFD *gf)
-{
- return 0;
-}
-
-static uint32_t featurefile_seekfn(CPUState *cs, GuestFD *gf,
- target_ulong offset)
-{
- gf->featurefile_offset = offset;
- return 0;
-}
-
-static uint32_t featurefile_flenfn(CPUState *cs, GuestFD *gf)
-{
- return sizeof(featurefile_data);
-}
-
-typedef struct GuestFDFunctions {
- sys_closefn *closefn;
- sys_writefn *writefn;
- sys_readfn *readfn;
- sys_isattyfn *isattyfn;
- sys_seekfn *seekfn;
- sys_flenfn *flenfn;
-} GuestFDFunctions;
-
-static const GuestFDFunctions guestfd_fns[] = {
- [GuestFDHost] = {
- .closefn = host_closefn,
- .writefn = host_writefn,
- .readfn = host_readfn,
- .isattyfn = host_isattyfn,
- .seekfn = host_seekfn,
- .flenfn = host_flenfn,
- },
- [GuestFDGDB] = {
- .closefn = gdb_closefn,
- .writefn = gdb_writefn,
- .readfn = gdb_readfn,
- .isattyfn = gdb_isattyfn,
- .seekfn = gdb_seekfn,
- .flenfn = gdb_flenfn,
- },
- [GuestFDFeatureFile] = {
- .closefn = featurefile_closefn,
- .writefn = featurefile_writefn,
- .readfn = featurefile_readfn,
- .isattyfn = featurefile_isattyfn,
- .seekfn = featurefile_seekfn,
- .flenfn = featurefile_flenfn,
- },
-};
-
-/* Read the input value from the argument block; fail the semihosting
- * call if the memory read fails.
- */
-#ifdef TARGET_ARM
-#define GET_ARG(n) do { \
- if (is_a64(env)) { \
- if (get_user_u64(arg ## n, args + (n) * 8)) { \
- errno = EFAULT; \
- return set_swi_errno(cs, -1); \
- } \
- } else { \
- if (get_user_u32(arg ## n, args + (n) * 4)) { \
- errno = EFAULT; \
- return set_swi_errno(cs, -1); \
- } \
- } \
-} while (0)
-
-#define SET_ARG(n, val) \
- (is_a64(env) ? \
- put_user_u64(val, args + (n) * 8) : \
- put_user_u32(val, args + (n) * 4))
-#endif
-
-#ifdef TARGET_RISCV
-
-/*
- * get_user_ual is defined as get_user_u32 in softmmu-semi.h,
- * we need a macro that fetches a target_ulong
- */
-#define get_user_utl(arg, p) \
- ((sizeof(target_ulong) == 8) ? \
- get_user_u64(arg, p) : \
- get_user_u32(arg, p))
-
-/*
- * put_user_ual is defined as put_user_u32 in softmmu-semi.h,
- * we need a macro that stores a target_ulong
- */
-#define put_user_utl(arg, p) \
- ((sizeof(target_ulong) == 8) ? \
- put_user_u64(arg, p) : \
- put_user_u32(arg, p))
-
-#define GET_ARG(n) do { \
- if (get_user_utl(arg ## n, args + (n) * sizeof(target_ulong))) { \
- errno = EFAULT; \
- return set_swi_errno(cs, -1); \
- } \
- } while (0)
-
-#define SET_ARG(n, val) \
- put_user_utl(val, args + (n) * sizeof(target_ulong))
-#endif
-
-/*
- * Do a semihosting call.
- *
- * The specification always says that the "return register" either
- * returns a specific value or is corrupted, so we don't need to
- * report to our caller whether we are returning a value or trying to
- * leave the register unchanged. We use 0xdeadbeef as the return value
- * when there isn't a defined return value for the call.
- */
-target_ulong do_common_semihosting(CPUState *cs)
-{
- CPUArchState *env = cs->env_ptr;
- target_ulong args;
- target_ulong arg0, arg1, arg2, arg3;
- target_ulong ul_ret;
- char * s;
- int nr;
- uint32_t ret;
- uint32_t len;
- GuestFD *gf;
- int64_t elapsed;
-
- (void) env; /* Used implicitly by arm lock_user macro */
- nr = common_semi_arg(cs, 0) & 0xffffffffU;
- args = common_semi_arg(cs, 1);
-
- switch (nr) {
- case TARGET_SYS_OPEN:
- {
- int guestfd;
-
- GET_ARG(0);
- GET_ARG(1);
- GET_ARG(2);
- s = lock_user_string(arg0);
- if (!s) {
- errno = EFAULT;
- return set_swi_errno(cs, -1);
- }
- if (arg1 >= 12) {
- unlock_user(s, arg0, 0);
- errno = EINVAL;
- return set_swi_errno(cs, -1);
- }
-
- guestfd = alloc_guestfd();
- if (guestfd < 0) {
- unlock_user(s, arg0, 0);
- errno = EMFILE;
- return set_swi_errno(cs, -1);
- }
-
- if (strcmp(s, ":tt") == 0) {
- int result_fileno;
-
- /*
- * We implement SH_EXT_STDOUT_STDERR, so:
- * open for read == stdin
- * open for write == stdout
- * open for append == stderr
- */
- if (arg1 < 4) {
- result_fileno = STDIN_FILENO;
- } else if (arg1 < 8) {
- result_fileno = STDOUT_FILENO;
- } else {
- result_fileno = STDERR_FILENO;
- }
- associate_guestfd(guestfd, result_fileno);
- unlock_user(s, arg0, 0);
- return guestfd;
- }
- if (strcmp(s, ":semihosting-features") == 0) {
- unlock_user(s, arg0, 0);
- /* We must fail opens for modes other than 0 ('r') or 1 ('rb') */
- if (arg1 != 0 && arg1 != 1) {
- dealloc_guestfd(guestfd);
- errno = EACCES;
- return set_swi_errno(cs, -1);
- }
- init_featurefile_guestfd(guestfd);
- return guestfd;
- }
-
- if (use_gdb_syscalls()) {
- common_semi_open_guestfd = guestfd;
- ret = common_semi_gdb_syscall(cs, common_semi_open_cb,
- "open,%s,%x,1a4", arg0, (int)arg2 + 1,
- gdb_open_modeflags[arg1]);
- } else {
- ret = set_swi_errno(cs, open(s, open_modeflags[arg1], 0644));
- if (ret == (uint32_t)-1) {
- dealloc_guestfd(guestfd);
- } else {
- associate_guestfd(guestfd, ret);
- ret = guestfd;
- }
- }
- unlock_user(s, arg0, 0);
- return ret;
- }
- case TARGET_SYS_CLOSE:
- GET_ARG(0);
-
- gf = get_guestfd(arg0);
- if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
- }
-
- ret = guestfd_fns[gf->type].closefn(cs, gf);
- dealloc_guestfd(arg0);
- return ret;
- case TARGET_SYS_WRITEC:
- qemu_semihosting_console_outc(cs->env_ptr, args);
- return 0xdeadbeef;
- case TARGET_SYS_WRITE0:
- return qemu_semihosting_console_outs(cs->env_ptr, args);
- case TARGET_SYS_WRITE:
- GET_ARG(0);
- GET_ARG(1);
- GET_ARG(2);
- len = arg2;
-
- gf = get_guestfd(arg0);
- if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
- }
-
- return guestfd_fns[gf->type].writefn(cs, gf, arg1, len);
- case TARGET_SYS_READ:
- GET_ARG(0);
- GET_ARG(1);
- GET_ARG(2);
- len = arg2;
-
- gf = get_guestfd(arg0);
- if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
- }
-
- return guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
- case TARGET_SYS_READC:
- return qemu_semihosting_console_inc(cs->env_ptr);
- case TARGET_SYS_ISERROR:
- GET_ARG(0);
- return (target_long) arg0 < 0 ? 1 : 0;
- case TARGET_SYS_ISTTY:
- GET_ARG(0);
-
- gf = get_guestfd(arg0);
- if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
- }
-
- return guestfd_fns[gf->type].isattyfn(cs, gf);
- case TARGET_SYS_SEEK:
- GET_ARG(0);
- GET_ARG(1);
-
- gf = get_guestfd(arg0);
- if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
- }
-
- return guestfd_fns[gf->type].seekfn(cs, gf, arg1);
- case TARGET_SYS_FLEN:
- GET_ARG(0);
-
- gf = get_guestfd(arg0);
- if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
- }
-
- return guestfd_fns[gf->type].flenfn(cs, gf);
- case TARGET_SYS_TMPNAM:
- GET_ARG(0);
- GET_ARG(1);
- GET_ARG(2);
- if (asprintf(&s, "/tmp/qemu-%x%02x", getpid(),
- (int) (arg1 & 0xff)) < 0) {
- return -1;
- }
- ul_ret = (target_ulong) -1;
-
- /* Make sure there's enough space in the buffer */
- if (strlen(s) < arg2) {
- char *output = lock_user(VERIFY_WRITE, arg0, arg2, 0);
- strcpy(output, s);
- unlock_user(output, arg0, arg2);
- ul_ret = 0;
- }
- free(s);
- return ul_ret;
- case TARGET_SYS_REMOVE:
- GET_ARG(0);
- GET_ARG(1);
- if (use_gdb_syscalls()) {
- ret = common_semi_gdb_syscall(cs, common_semi_cb, "unlink,%s",
- arg0, (int)arg1 + 1);
- } else {
- s = lock_user_string(arg0);
- if (!s) {
- errno = EFAULT;
- return set_swi_errno(cs, -1);
- }
- ret = set_swi_errno(cs, remove(s));
- unlock_user(s, arg0, 0);
- }
- return ret;
- case TARGET_SYS_RENAME:
- GET_ARG(0);
- GET_ARG(1);
- GET_ARG(2);
- GET_ARG(3);
- if (use_gdb_syscalls()) {
- return common_semi_gdb_syscall(cs, common_semi_cb, "rename,%s,%s",
- arg0, (int)arg1 + 1, arg2,
- (int)arg3 + 1);
- } else {
- char *s2;
- s = lock_user_string(arg0);
- s2 = lock_user_string(arg2);
- if (!s || !s2) {
- errno = EFAULT;
- ret = set_swi_errno(cs, -1);
- } else {
- ret = set_swi_errno(cs, rename(s, s2));
- }
- if (s2)
- unlock_user(s2, arg2, 0);
- if (s)
- unlock_user(s, arg0, 0);
- return ret;
- }
- case TARGET_SYS_CLOCK:
- return clock() / (CLOCKS_PER_SEC / 100);
- case TARGET_SYS_TIME:
- return set_swi_errno(cs, time(NULL));
- case TARGET_SYS_SYSTEM:
- GET_ARG(0);
- GET_ARG(1);
- if (use_gdb_syscalls()) {
- return common_semi_gdb_syscall(cs, common_semi_cb, "system,%s",
- arg0, (int)arg1 + 1);
- } else {
- s = lock_user_string(arg0);
- if (!s) {
- errno = EFAULT;
- return set_swi_errno(cs, -1);
- }
- ret = set_swi_errno(cs, system(s));
- unlock_user(s, arg0, 0);
- return ret;
- }
- case TARGET_SYS_ERRNO:
- return get_swi_errno(cs);
- case TARGET_SYS_GET_CMDLINE:
- {
- /* Build a command-line from the original argv.
- *
- * The inputs are:
- * * arg0, pointer to a buffer of at least the size
- * specified in arg1.
- * * arg1, size of the buffer pointed to by arg0 in
- * bytes.
- *
- * The outputs are:
- * * arg0, pointer to null-terminated string of the
- * command line.
- * * arg1, length of the string pointed to by arg0.
- */
-
- char *output_buffer;
- size_t input_size;
- size_t output_size;
- int status = 0;
-#if !defined(CONFIG_USER_ONLY)
- const char *cmdline;
-#else
- TaskState *ts = cs->opaque;
-#endif
- GET_ARG(0);
- GET_ARG(1);
- input_size = arg1;
- /* Compute the size of the output string. */
-#if !defined(CONFIG_USER_ONLY)
- cmdline = semihosting_get_cmdline();
- if (cmdline == NULL) {
- cmdline = ""; /* Default to an empty line. */
- }
- output_size = strlen(cmdline) + 1; /* Count terminating 0. */
-#else
- unsigned int i;
-
- output_size = ts->info->arg_end - ts->info->arg_start;
- if (!output_size) {
- /*
- * We special-case the "empty command line" case (argc==0).
- * Just provide the terminating 0.
- */
- output_size = 1;
- }
-#endif
-
- if (output_size > input_size) {
- /* Not enough space to store command-line arguments. */
- errno = E2BIG;
- return set_swi_errno(cs, -1);
- }
-
- /* Adjust the command-line length. */
- if (SET_ARG(1, output_size - 1)) {
- /* Couldn't write back to argument block */
- errno = EFAULT;
- return set_swi_errno(cs, -1);
- }
-
- /* Lock the buffer on the ARM side. */
- output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
- if (!output_buffer) {
- errno = EFAULT;
- return set_swi_errno(cs, -1);
- }
-
- /* Copy the command-line arguments. */
-#if !defined(CONFIG_USER_ONLY)
- pstrcpy(output_buffer, output_size, cmdline);
-#else
- if (output_size == 1) {
- /* Empty command-line. */
- output_buffer[0] = '\0';
- goto out;
- }
-
- if (copy_from_user(output_buffer, ts->info->arg_start,
- output_size)) {
- errno = EFAULT;
- status = set_swi_errno(cs, -1);
- goto out;
- }
-
- /* Separate arguments by white spaces. */
- for (i = 0; i < output_size - 1; i++) {
- if (output_buffer[i] == 0) {
- output_buffer[i] = ' ';
- }
- }
- out:
-#endif
- /* Unlock the buffer on the ARM side. */
- unlock_user(output_buffer, arg0, output_size);
-
- return status;
- }
- case TARGET_SYS_HEAPINFO:
- {
- target_ulong retvals[4];
- target_ulong limit;
- int i;
-#ifdef CONFIG_USER_ONLY
- TaskState *ts = cs->opaque;
-#else
- target_ulong rambase = common_semi_rambase(cs);
-#endif
-
- GET_ARG(0);
-
-#ifdef CONFIG_USER_ONLY
- /*
- * Some C libraries assume the heap immediately follows .bss, so
- * allocate it using sbrk.
- */
- if (!ts->heap_limit) {
- abi_ulong ret;
-
- ts->heap_base = do_brk(0);
- limit = ts->heap_base + COMMON_SEMI_HEAP_SIZE;
- /* Try a big heap, and reduce the size if that fails. */
- for (;;) {
- ret = do_brk(limit);
- if (ret >= limit) {
- break;
- }
- limit = (ts->heap_base >> 1) + (limit >> 1);
- }
- ts->heap_limit = limit;
- }
-
- retvals[0] = ts->heap_base;
- retvals[1] = ts->heap_limit;
- retvals[2] = ts->stack_base;
- retvals[3] = 0; /* Stack limit. */
-#else
- limit = current_machine->ram_size;
- /* TODO: Make this use the limit of the loaded application. */
- retvals[0] = rambase + limit / 2;
- retvals[1] = rambase + limit;
- retvals[2] = rambase + limit; /* Stack base */
- retvals[3] = rambase; /* Stack limit. */
-#endif
-
- for (i = 0; i < ARRAY_SIZE(retvals); i++) {
- bool fail;
-
- fail = SET_ARG(i, retvals[i]);
-
- if (fail) {
- /* Couldn't write back to argument block */
- errno = EFAULT;
- return set_swi_errno(cs, -1);
- }
- }
- return 0;
- }
- case TARGET_SYS_EXIT:
- case TARGET_SYS_EXIT_EXTENDED:
- if (common_semi_sys_exit_extended(cs, nr)) {
- /*
- * The A64 version of SYS_EXIT takes a parameter block,
- * so the application-exit type can return a subcode which
- * is the exit status code from the application.
- * SYS_EXIT_EXTENDED is an a new-in-v2.0 optional function
- * which allows A32/T32 guests to also provide a status code.
- */
- GET_ARG(0);
- GET_ARG(1);
-
- if (arg0 == ADP_Stopped_ApplicationExit) {
- ret = arg1;
- } else {
- ret = 1;
- }
- } else {
- /*
- * The A32/T32 version of SYS_EXIT specifies only
- * Stopped_ApplicationExit as normal exit, but does not
- * allow the guest to specify the exit status code.
- * Everything else is considered an error.
- */
- ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
- }
- gdb_exit(ret);
- exit(ret);
- case TARGET_SYS_ELAPSED:
- elapsed = get_clock() - clock_start;
- if (sizeof(target_ulong) == 8) {
- SET_ARG(0, elapsed);
- } else {
- SET_ARG(0, (uint32_t) elapsed);
- SET_ARG(1, (uint32_t) (elapsed >> 32));
- }
- return 0;
- case TARGET_SYS_TICKFREQ:
- /* qemu always uses nsec */
- return 1000000000;
- case TARGET_SYS_SYNCCACHE:
- /*
- * Clean the D-cache and invalidate the I-cache for the specified
- * virtual address range. This is a nop for us since we don't
- * implement caches. This is only present on A64.
- */
-#ifdef TARGET_ARM
- if (is_a64(cs->env_ptr)) {
- return 0;
- }
-#endif
-#ifdef TARGET_RISCV
- return 0;
-#endif
- /* fall through -- invalid for A32/T32 */
- default:
- fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
- cpu_dump_state(cs, stderr, 0);
- abort();
- }
-}
+++ /dev/null
-/*
- * Semihosting support for systems modeled on the Arm "Angel"
- * semihosting syscalls design. This includes Arm and RISC-V processors
- *
- * Copyright (c) 2005, 2007 CodeSourcery.
- * Copyright (c) 2019 Linaro
- * Written by Paul Brook.
- *
- * Copyright © 2020 by Keith Packard <keithp@keithp.com>
- * Adapted for systems other than ARM, including RISC-V, by Keith Packard
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
- *
- * ARM Semihosting is documented in:
- * Semihosting for AArch32 and AArch64 Release 2.0
- * https://static.docs.arm.com/100863/0200/semihosting.pdf
- *
- * RISC-V Semihosting is documented in:
- * RISC-V Semihosting
- * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
- */
-
-#ifndef COMMON_SEMI_H
-#define COMMON_SEMI_H
-
-target_ulong do_common_semihosting(CPUState *cs);
-
-#endif /* COMMON_SEMI_H */
+++ /dev/null
-/*
- * Semihosting configuration
- *
- * Copyright (c) 2015 Imagination Technologies
- * Copyright (c) 2019 Linaro Ltd
- *
- * This controls the configuration of semihosting for all guest
- * targets that support it. Architecture specific handling is handled
- * in target/HW/HW-semi.c
- *
- * Semihosting is sightly strange in that it is also supported by some
- * linux-user targets. However in that use case no configuration of
- * the outputs and command lines is supported.
- *
- * The config module is common to all softmmu targets however as vl.c
- * needs to link against the helpers.
- *
- * SPDX-License-Identifier: GPL-2.0-or-later
- */
-
-#include "qemu/osdep.h"
-#include "qemu/option.h"
-#include "qemu/config-file.h"
-#include "qemu/error-report.h"
-#include "semihosting/semihost.h"
-#include "chardev/char.h"
-#include "sysemu/sysemu.h"
-
-QemuOptsList qemu_semihosting_config_opts = {
- .name = "semihosting-config",
- .implied_opt_name = "enable",
- .head = QTAILQ_HEAD_INITIALIZER(qemu_semihosting_config_opts.head),
- .desc = {
- {
- .name = "enable",
- .type = QEMU_OPT_BOOL,
- }, {
- .name = "target",
- .type = QEMU_OPT_STRING,
- }, {
- .name = "chardev",
- .type = QEMU_OPT_STRING,
- }, {
- .name = "arg",
- .type = QEMU_OPT_STRING,
- },
- { /* end of list */ }
- },
-};
-
-typedef struct SemihostingConfig {
- bool enabled;
- SemihostingTarget target;
- Chardev *chardev;
- const char **argv;
- int argc;
- const char *cmdline; /* concatenated argv */
-} SemihostingConfig;
-
-static SemihostingConfig semihosting;
-static const char *semihost_chardev;
-
-bool semihosting_enabled(void)
-{
- return semihosting.enabled;
-}
-
-SemihostingTarget semihosting_get_target(void)
-{
- return semihosting.target;
-}
-
-const char *semihosting_get_arg(int i)
-{
- if (i >= semihosting.argc) {
- return NULL;
- }
- return semihosting.argv[i];
-}
-
-int semihosting_get_argc(void)
-{
- return semihosting.argc;
-}
-
-const char *semihosting_get_cmdline(void)
-{
- if (semihosting.cmdline == NULL && semihosting.argc > 0) {
- semihosting.cmdline = g_strjoinv(" ", (gchar **)semihosting.argv);
- }
- return semihosting.cmdline;
-}
-
-static int add_semihosting_arg(void *opaque,
- const char *name, const char *val,
- Error **errp)
-{
- SemihostingConfig *s = opaque;
- if (strcmp(name, "arg") == 0) {
- s->argc++;
- /* one extra element as g_strjoinv() expects NULL-terminated array */
- s->argv = g_realloc(s->argv, (s->argc + 1) * sizeof(void *));
- s->argv[s->argc - 1] = val;
- s->argv[s->argc] = NULL;
- }
- return 0;
-}
-
-/* Use strings passed via -kernel/-append to initialize semihosting.argv[] */
-void semihosting_arg_fallback(const char *file, const char *cmd)
-{
- char *cmd_token;
-
- /* argv[0] */
- add_semihosting_arg(&semihosting, "arg", file, NULL);
-
- /* split -append and initialize argv[1..n] */
- cmd_token = strtok(g_strdup(cmd), " ");
- while (cmd_token) {
- add_semihosting_arg(&semihosting, "arg", cmd_token, NULL);
- cmd_token = strtok(NULL, " ");
- }
-}
-
-Chardev *semihosting_get_chardev(void)
-{
- return semihosting.chardev;
-}
-
-void qemu_semihosting_enable(void)
-{
- semihosting.enabled = true;
- semihosting.target = SEMIHOSTING_TARGET_AUTO;
-}
-
-int qemu_semihosting_config_options(const char *optarg)
-{
- QemuOptsList *opt_list = qemu_find_opts("semihosting-config");
- QemuOpts *opts = qemu_opts_parse_noisily(opt_list, optarg, false);
-
- semihosting.enabled = true;
-
- if (opts != NULL) {
- semihosting.enabled = qemu_opt_get_bool(opts, "enable",
- true);
- const char *target = qemu_opt_get(opts, "target");
- /* setup of chardev is deferred until they are initialised */
- semihost_chardev = qemu_opt_get(opts, "chardev");
- if (target != NULL) {
- if (strcmp("native", target) == 0) {
- semihosting.target = SEMIHOSTING_TARGET_NATIVE;
- } else if (strcmp("gdb", target) == 0) {
- semihosting.target = SEMIHOSTING_TARGET_GDB;
- } else if (strcmp("auto", target) == 0) {
- semihosting.target = SEMIHOSTING_TARGET_AUTO;
- } else {
- error_report("unsupported semihosting-config %s",
- optarg);
- return 1;
- }
- } else {
- semihosting.target = SEMIHOSTING_TARGET_AUTO;
- }
- /* Set semihosting argument count and vector */
- qemu_opt_foreach(opts, add_semihosting_arg,
- &semihosting, NULL);
- } else {
- error_report("unsupported semihosting-config %s", optarg);
- return 1;
- }
-
- return 0;
-}
-
-void qemu_semihosting_connect_chardevs(void)
-{
- /* We had to defer this until chardevs were created */
- if (semihost_chardev) {
- Chardev *chr = qemu_chr_find(semihost_chardev);
- if (chr == NULL) {
- error_report("semihosting chardev '%s' not found",
- semihost_chardev);
- exit(1);
- }
- semihosting.chardev = chr;
- }
-}
+++ /dev/null
-/*
- * Semihosting Console Support
- *
- * Copyright (c) 2015 Imagination Technologies
- * Copyright (c) 2019 Linaro Ltd
- *
- * This provides support for outputting to a semihosting console.
- *
- * While most semihosting implementations support reading and writing
- * to arbitrary file descriptors we treat the console as something
- * specifically for debugging interaction. This means messages can be
- * re-directed to gdb (if currently being used to debug) or even
- * re-directed elsewhere.
- *
- * SPDX-License-Identifier: GPL-2.0-or-later
- */
-
-#include "qemu/osdep.h"
-#include "cpu.h"
-#include "semihosting/semihost.h"
-#include "semihosting/console.h"
-#include "exec/gdbstub.h"
-#include "exec/exec-all.h"
-#include "qemu/log.h"
-#include "chardev/char.h"
-#include "chardev/char-fe.h"
-#include "sysemu/sysemu.h"
-#include "qemu/main-loop.h"
-#include "qapi/error.h"
-#include "qemu/fifo8.h"
-
-int qemu_semihosting_log_out(const char *s, int len)
-{
- Chardev *chardev = semihosting_get_chardev();
- if (chardev) {
- return qemu_chr_write_all(chardev, (uint8_t *) s, len);
- } else {
- return write(STDERR_FILENO, s, len);
- }
-}
-
-/*
- * A re-implementation of lock_user_string that we can use locally
- * instead of relying on softmmu-semi. Hopefully we can deprecate that
- * in time. Copy string until we find a 0 or address error.
- */
-static GString *copy_user_string(CPUArchState *env, target_ulong addr)
-{
- CPUState *cpu = env_cpu(env);
- GString *s = g_string_sized_new(128);
- uint8_t c;
-
- do {
- if (cpu_memory_rw_debug(cpu, addr++, &c, 1, 0) == 0) {
- if (c) {
- s = g_string_append_c(s, c);
- }
- } else {
- qemu_log_mask(LOG_GUEST_ERROR,
- "%s: passed inaccessible address " TARGET_FMT_lx,
- __func__, addr);
- break;
- }
- } while (c!=0);
-
- return s;
-}
-
-static void semihosting_cb(CPUState *cs, target_ulong ret, target_ulong err)
-{
- if (ret == (target_ulong) -1) {
- qemu_log("%s: gdb console output failed ("TARGET_FMT_ld")",
- __func__, err);
- }
-}
-
-int qemu_semihosting_console_outs(CPUArchState *env, target_ulong addr)
-{
- GString *s = copy_user_string(env, addr);
- int out = s->len;
-
- if (use_gdb_syscalls()) {
- gdb_do_syscall(semihosting_cb, "write,2,%x,%x", addr, s->len);
- } else {
- out = qemu_semihosting_log_out(s->str, s->len);
- }
-
- g_string_free(s, true);
- return out;
-}
-
-void qemu_semihosting_console_outc(CPUArchState *env, target_ulong addr)
-{
- CPUState *cpu = env_cpu(env);
- uint8_t c;
-
- if (cpu_memory_rw_debug(cpu, addr, &c, 1, 0) == 0) {
- if (use_gdb_syscalls()) {
- gdb_do_syscall(semihosting_cb, "write,2,%x,%x", addr, 1);
- } else {
- qemu_semihosting_log_out((const char *) &c, 1);
- }
- } else {
- qemu_log_mask(LOG_GUEST_ERROR,
- "%s: passed inaccessible address " TARGET_FMT_lx,
- __func__, addr);
- }
-}
-
-#define FIFO_SIZE 1024
-
-/* Access to this structure is protected by the BQL */
-typedef struct SemihostingConsole {
- CharBackend backend;
- GSList *sleeping_cpus;
- bool got;
- Fifo8 fifo;
-} SemihostingConsole;
-
-static SemihostingConsole console;
-
-static int console_can_read(void *opaque)
-{
- SemihostingConsole *c = opaque;
- int ret;
- g_assert(qemu_mutex_iothread_locked());
- ret = (int) fifo8_num_free(&c->fifo);
- return ret;
-}
-
-static void console_wake_up(gpointer data, gpointer user_data)
-{
- CPUState *cs = (CPUState *) data;
- /* cpu_handle_halt won't know we have work so just unbung here */
- cs->halted = 0;
- qemu_cpu_kick(cs);
-}
-
-static void console_read(void *opaque, const uint8_t *buf, int size)
-{
- SemihostingConsole *c = opaque;
- g_assert(qemu_mutex_iothread_locked());
- while (size-- && !fifo8_is_full(&c->fifo)) {
- fifo8_push(&c->fifo, *buf++);
- }
- g_slist_foreach(c->sleeping_cpus, console_wake_up, NULL);
- c->sleeping_cpus = NULL;
-}
-
-target_ulong qemu_semihosting_console_inc(CPUArchState *env)
-{
- uint8_t ch;
- SemihostingConsole *c = &console;
- g_assert(qemu_mutex_iothread_locked());
- g_assert(current_cpu);
- if (fifo8_is_empty(&c->fifo)) {
- c->sleeping_cpus = g_slist_prepend(c->sleeping_cpus, current_cpu);
- current_cpu->halted = 1;
- current_cpu->exception_index = EXCP_HALTED;
- cpu_loop_exit(current_cpu);
- /* never returns */
- }
- ch = fifo8_pop(&c->fifo);
- return (target_ulong) ch;
-}
-
-void qemu_semihosting_console_init(void)
-{
- Chardev *chr = semihosting_get_chardev();
-
- if (chr) {
- fifo8_create(&console.fifo, FIFO_SIZE);
- qemu_chr_fe_init(&console.backend, chr, &error_abort);
- qemu_chr_fe_set_handlers(&console.backend,
- console_can_read,
- console_read,
- NULL, NULL, &console,
- NULL, true);
- }
-}
+++ /dev/null
-specific_ss.add(when: 'CONFIG_SEMIHOSTING', if_true: files(
- 'config.c',
- 'console.c',
-))
-
-specific_ss.add(when: ['CONFIG_ARM_COMPATIBLE_SEMIHOSTING'],
- if_true: files('arm-compat-semi.c'))
subdir('monitor')
subdir('net')
subdir('replay')
+subdir('semihosting')
subdir('hw')
subdir('accel')
subdir('plugins')
--- /dev/null
+
+config SEMIHOSTING
+ bool
+
+config ARM_COMPATIBLE_SEMIHOSTING
+ bool
+ select SEMIHOSTING
--- /dev/null
+/*
+ * Semihosting support for systems modeled on the Arm "Angel"
+ * semihosting syscalls design. This includes Arm and RISC-V processors
+ *
+ * Copyright (c) 2005, 2007 CodeSourcery.
+ * Copyright (c) 2019 Linaro
+ * Written by Paul Brook.
+ *
+ * Copyright © 2020 by Keith Packard <keithp@keithp.com>
+ * Adapted for systems other than ARM, including RISC-V, by Keith Packard
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * ARM Semihosting is documented in:
+ * Semihosting for AArch32 and AArch64 Release 2.0
+ * https://static.docs.arm.com/100863/0200/semihosting.pdf
+ *
+ * RISC-V Semihosting is documented in:
+ * RISC-V Semihosting
+ * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
+ */
+
+#include "qemu/osdep.h"
+
+#include "cpu.h"
+#include "semihosting/semihost.h"
+#include "semihosting/console.h"
+#include "semihosting/common-semi.h"
+#include "qemu/log.h"
+#include "qemu/timer.h"
+#ifdef CONFIG_USER_ONLY
+#include "qemu.h"
+
+#define COMMON_SEMI_HEAP_SIZE (128 * 1024 * 1024)
+#else
+#include "exec/gdbstub.h"
+#include "qemu/cutils.h"
+#ifdef TARGET_ARM
+#include "hw/arm/boot.h"
+#endif
+#include "hw/boards.h"
+#endif
+
+#define TARGET_SYS_OPEN 0x01
+#define TARGET_SYS_CLOSE 0x02
+#define TARGET_SYS_WRITEC 0x03
+#define TARGET_SYS_WRITE0 0x04
+#define TARGET_SYS_WRITE 0x05
+#define TARGET_SYS_READ 0x06
+#define TARGET_SYS_READC 0x07
+#define TARGET_SYS_ISERROR 0x08
+#define TARGET_SYS_ISTTY 0x09
+#define TARGET_SYS_SEEK 0x0a
+#define TARGET_SYS_FLEN 0x0c
+#define TARGET_SYS_TMPNAM 0x0d
+#define TARGET_SYS_REMOVE 0x0e
+#define TARGET_SYS_RENAME 0x0f
+#define TARGET_SYS_CLOCK 0x10
+#define TARGET_SYS_TIME 0x11
+#define TARGET_SYS_SYSTEM 0x12
+#define TARGET_SYS_ERRNO 0x13
+#define TARGET_SYS_GET_CMDLINE 0x15
+#define TARGET_SYS_HEAPINFO 0x16
+#define TARGET_SYS_EXIT 0x18
+#define TARGET_SYS_SYNCCACHE 0x19
+#define TARGET_SYS_EXIT_EXTENDED 0x20
+#define TARGET_SYS_ELAPSED 0x30
+#define TARGET_SYS_TICKFREQ 0x31
+
+/* ADP_Stopped_ApplicationExit is used for exit(0),
+ * anything else is implemented as exit(1) */
+#define ADP_Stopped_ApplicationExit (0x20026)
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+#define GDB_O_RDONLY 0x000
+#define GDB_O_WRONLY 0x001
+#define GDB_O_RDWR 0x002
+#define GDB_O_APPEND 0x008
+#define GDB_O_CREAT 0x200
+#define GDB_O_TRUNC 0x400
+#define GDB_O_BINARY 0
+
+static int gdb_open_modeflags[12] = {
+ GDB_O_RDONLY,
+ GDB_O_RDONLY | GDB_O_BINARY,
+ GDB_O_RDWR,
+ GDB_O_RDWR | GDB_O_BINARY,
+ GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC,
+ GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
+ GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC,
+ GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
+ GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND,
+ GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY,
+ GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND,
+ GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY
+};
+
+static int open_modeflags[12] = {
+ O_RDONLY,
+ O_RDONLY | O_BINARY,
+ O_RDWR,
+ O_RDWR | O_BINARY,
+ O_WRONLY | O_CREAT | O_TRUNC,
+ O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
+ O_RDWR | O_CREAT | O_TRUNC,
+ O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
+ O_WRONLY | O_CREAT | O_APPEND,
+ O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
+ O_RDWR | O_CREAT | O_APPEND,
+ O_RDWR | O_CREAT | O_APPEND | O_BINARY
+};
+
+typedef enum GuestFDType {
+ GuestFDUnused = 0,
+ GuestFDHost = 1,
+ GuestFDGDB = 2,
+ GuestFDFeatureFile = 3,
+} GuestFDType;
+
+/*
+ * Guest file descriptors are integer indexes into an array of
+ * these structures (we will dynamically resize as necessary).
+ */
+typedef struct GuestFD {
+ GuestFDType type;
+ union {
+ int hostfd;
+ target_ulong featurefile_offset;
+ };
+} GuestFD;
+
+static GArray *guestfd_array;
+
+#ifndef CONFIG_USER_ONLY
+#include "exec/address-spaces.h"
+/*
+ * Find the base of a RAM region containing the specified address
+ */
+static inline hwaddr
+common_semi_find_region_base(hwaddr addr)
+{
+ MemoryRegion *subregion;
+
+ /*
+ * Find the chunk of R/W memory containing the address. This is
+ * used for the SYS_HEAPINFO semihosting call, which should
+ * probably be using information from the loaded application.
+ */
+ QTAILQ_FOREACH(subregion, &get_system_memory()->subregions,
+ subregions_link) {
+ if (subregion->ram && !subregion->readonly) {
+ Int128 top128 = int128_add(int128_make64(subregion->addr),
+ subregion->size);
+ Int128 addr128 = int128_make64(addr);
+ if (subregion->addr <= addr && int128_lt(addr128, top128)) {
+ return subregion->addr;
+ }
+ }
+ }
+ return 0;
+}
+#endif
+
+#ifdef TARGET_ARM
+static inline target_ulong
+common_semi_arg(CPUState *cs, int argno)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ if (is_a64(env)) {
+ return env->xregs[argno];
+ } else {
+ return env->regs[argno];
+ }
+}
+
+static inline void
+common_semi_set_ret(CPUState *cs, target_ulong ret)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ if (is_a64(env)) {
+ env->xregs[0] = ret;
+ } else {
+ env->regs[0] = ret;
+ }
+}
+
+static inline bool
+common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+ return (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(cs->env_ptr));
+}
+
+#ifndef CONFIG_USER_ONLY
+#include "hw/arm/boot.h"
+static inline target_ulong
+common_semi_rambase(CPUState *cs)
+{
+ CPUArchState *env = cs->env_ptr;
+ const struct arm_boot_info *info = env->boot_info;
+ target_ulong sp;
+
+ if (info) {
+ return info->loader_start;
+ }
+
+ if (is_a64(env)) {
+ sp = env->xregs[31];
+ } else {
+ sp = env->regs[13];
+ }
+ return common_semi_find_region_base(sp);
+}
+#endif
+
+#endif /* TARGET_ARM */
+
+#ifdef TARGET_RISCV
+static inline target_ulong
+common_semi_arg(CPUState *cs, int argno)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ return env->gpr[xA0 + argno];
+}
+
+static inline void
+common_semi_set_ret(CPUState *cs, target_ulong ret)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ env->gpr[xA0] = ret;
+}
+
+static inline bool
+common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+ return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8);
+}
+
+#ifndef CONFIG_USER_ONLY
+
+static inline target_ulong
+common_semi_rambase(CPUState *cs)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ return common_semi_find_region_base(env->gpr[xSP]);
+}
+#endif
+
+#endif
+
+/*
+ * Allocate a new guest file descriptor and return it; if we
+ * couldn't allocate a new fd then return -1.
+ * This is a fairly simplistic implementation because we don't
+ * expect that most semihosting guest programs will make very
+ * heavy use of opening and closing fds.
+ */
+static int alloc_guestfd(void)
+{
+ guint i;
+
+ if (!guestfd_array) {
+ /* New entries zero-initialized, i.e. type GuestFDUnused */
+ guestfd_array = g_array_new(FALSE, TRUE, sizeof(GuestFD));
+ }
+
+ /* SYS_OPEN should return nonzero handle on success. Start guestfd from 1 */
+ for (i = 1; i < guestfd_array->len; i++) {
+ GuestFD *gf = &g_array_index(guestfd_array, GuestFD, i);
+
+ if (gf->type == GuestFDUnused) {
+ return i;
+ }
+ }
+
+ /* All elements already in use: expand the array */
+ g_array_set_size(guestfd_array, i + 1);
+ return i;
+}
+
+/*
+ * Look up the guestfd in the data structure; return NULL
+ * for out of bounds, but don't check whether the slot is unused.
+ * This is used internally by the other guestfd functions.
+ */
+static GuestFD *do_get_guestfd(int guestfd)
+{
+ if (!guestfd_array) {
+ return NULL;
+ }
+
+ if (guestfd <= 0 || guestfd >= guestfd_array->len) {
+ return NULL;
+ }
+
+ return &g_array_index(guestfd_array, GuestFD, guestfd);
+}
+
+/*
+ * Associate the specified guest fd (which must have been
+ * allocated via alloc_fd() and not previously used) with
+ * the specified host/gdb fd.
+ */
+static void associate_guestfd(int guestfd, int hostfd)
+{
+ GuestFD *gf = do_get_guestfd(guestfd);
+
+ assert(gf);
+ gf->type = use_gdb_syscalls() ? GuestFDGDB : GuestFDHost;
+ gf->hostfd = hostfd;
+}
+
+/*
+ * Deallocate the specified guest file descriptor. This doesn't
+ * close the host fd, it merely undoes the work of alloc_fd().
+ */
+static void dealloc_guestfd(int guestfd)
+{
+ GuestFD *gf = do_get_guestfd(guestfd);
+
+ assert(gf);
+ gf->type = GuestFDUnused;
+}
+
+/*
+ * Given a guest file descriptor, get the associated struct.
+ * If the fd is not valid, return NULL. This is the function
+ * used by the various semihosting calls to validate a handle
+ * from the guest.
+ * Note: calling alloc_guestfd() or dealloc_guestfd() will
+ * invalidate any GuestFD* obtained by calling this function.
+ */
+static GuestFD *get_guestfd(int guestfd)
+{
+ GuestFD *gf = do_get_guestfd(guestfd);
+
+ if (!gf || gf->type == GuestFDUnused) {
+ return NULL;
+ }
+ return gf;
+}
+
+/*
+ * The semihosting API has no concept of its errno being thread-safe,
+ * as the API design predates SMP CPUs and was intended as a simple
+ * real-hardware set of debug functionality. For QEMU, we make the
+ * errno be per-thread in linux-user mode; in softmmu it is a simple
+ * global, and we assume that the guest takes care of avoiding any races.
+ */
+#ifndef CONFIG_USER_ONLY
+static target_ulong syscall_err;
+
+#include "exec/softmmu-semi.h"
+#endif
+
+static inline uint32_t set_swi_errno(CPUState *cs, uint32_t code)
+{
+ if (code == (uint32_t)-1) {
+#ifdef CONFIG_USER_ONLY
+ TaskState *ts = cs->opaque;
+
+ ts->swi_errno = errno;
+#else
+ syscall_err = errno;
+#endif
+ }
+ return code;
+}
+
+static inline uint32_t get_swi_errno(CPUState *cs)
+{
+#ifdef CONFIG_USER_ONLY
+ TaskState *ts = cs->opaque;
+
+ return ts->swi_errno;
+#else
+ return syscall_err;
+#endif
+}
+
+static target_ulong common_semi_syscall_len;
+
+static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
+{
+ target_ulong reg0 = common_semi_arg(cs, 0);
+
+ if (ret == (target_ulong)-1) {
+ errno = err;
+ set_swi_errno(cs, -1);
+ reg0 = ret;
+ } else {
+ /* Fixup syscalls that use nonstardard return conventions. */
+ switch (reg0) {
+ case TARGET_SYS_WRITE:
+ case TARGET_SYS_READ:
+ reg0 = common_semi_syscall_len - ret;
+ break;
+ case TARGET_SYS_SEEK:
+ reg0 = 0;
+ break;
+ default:
+ reg0 = ret;
+ break;
+ }
+ }
+ common_semi_set_ret(cs, reg0);
+}
+
+static target_ulong common_semi_flen_buf(CPUState *cs)
+{
+ target_ulong sp;
+#ifdef TARGET_ARM
+ /* Return an address in target memory of 64 bytes where the remote
+ * gdb should write its stat struct. (The format of this structure
+ * is defined by GDB's remote protocol and is not target-specific.)
+ * We put this on the guest's stack just below SP.
+ */
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+
+ if (is_a64(env)) {
+ sp = env->xregs[31];
+ } else {
+ sp = env->regs[13];
+ }
+#endif
+#ifdef TARGET_RISCV
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+
+ sp = env->gpr[xSP];
+#endif
+
+ return sp - 64;
+}
+
+static void
+common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
+{
+ /* The size is always stored in big-endian order, extract
+ the value. We assume the size always fit in 32 bits. */
+ uint32_t size;
+ cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) + 32,
+ (uint8_t *)&size, 4, 0);
+ size = be32_to_cpu(size);
+ common_semi_set_ret(cs, size);
+ errno = err;
+ set_swi_errno(cs, -1);
+}
+
+static int common_semi_open_guestfd;
+
+static void
+common_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
+{
+ if (ret == (target_ulong)-1) {
+ errno = err;
+ set_swi_errno(cs, -1);
+ dealloc_guestfd(common_semi_open_guestfd);
+ } else {
+ associate_guestfd(common_semi_open_guestfd, ret);
+ ret = common_semi_open_guestfd;
+ }
+ common_semi_set_ret(cs, ret);
+}
+
+static target_ulong
+common_semi_gdb_syscall(CPUState *cs, gdb_syscall_complete_cb cb,
+ const char *fmt, ...)
+{
+ va_list va;
+
+ va_start(va, fmt);
+ gdb_do_syscallv(cb, fmt, va);
+ va_end(va);
+
+ /*
+ * FIXME: in softmmu mode, the gdbstub will schedule our callback
+ * to occur, but will not actually call it to complete the syscall
+ * until after this function has returned and we are back in the
+ * CPU main loop. Therefore callers to this function must not
+ * do anything with its return value, because it is not necessarily
+ * the result of the syscall, but could just be the old value of X0.
+ * The only thing safe to do with this is that the callers of
+ * do_common_semihosting() will write it straight back into X0.
+ * (In linux-user mode, the callback will have happened before
+ * gdb_do_syscallv() returns.)
+ *
+ * We should tidy this up so neither this function nor
+ * do_common_semihosting() return a value, so the mistake of
+ * doing something with the return value is not possible to make.
+ */
+
+ return common_semi_arg(cs, 0);
+}
+
+/*
+ * Types for functions implementing various semihosting calls
+ * for specific types of guest file descriptor. These must all
+ * do the work and return the required return value for the guest,
+ * setting the guest errno if appropriate.
+ */
+typedef uint32_t sys_closefn(CPUState *cs, GuestFD *gf);
+typedef uint32_t sys_writefn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len);
+typedef uint32_t sys_readfn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len);
+typedef uint32_t sys_isattyfn(CPUState *cs, GuestFD *gf);
+typedef uint32_t sys_seekfn(CPUState *cs, GuestFD *gf,
+ target_ulong offset);
+typedef uint32_t sys_flenfn(CPUState *cs, GuestFD *gf);
+
+static uint32_t host_closefn(CPUState *cs, GuestFD *gf)
+{
+ /*
+ * Only close the underlying host fd if it's one we opened on behalf
+ * of the guest in SYS_OPEN.
+ */
+ if (gf->hostfd == STDIN_FILENO ||
+ gf->hostfd == STDOUT_FILENO ||
+ gf->hostfd == STDERR_FILENO) {
+ return 0;
+ }
+ return set_swi_errno(cs, close(gf->hostfd));
+}
+
+static uint32_t host_writefn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len)
+{
+ CPUArchState *env = cs->env_ptr;
+ uint32_t ret;
+ char *s = lock_user(VERIFY_READ, buf, len, 1);
+ (void) env; /* Used in arm softmmu lock_user implicitly */
+ if (!s) {
+ /* Return bytes not written on error */
+ return len;
+ }
+ ret = set_swi_errno(cs, write(gf->hostfd, s, len));
+ unlock_user(s, buf, 0);
+ if (ret == (uint32_t)-1) {
+ ret = 0;
+ }
+ /* Return bytes not written */
+ return len - ret;
+}
+
+static uint32_t host_readfn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len)
+{
+ CPUArchState *env = cs->env_ptr;
+ uint32_t ret;
+ char *s = lock_user(VERIFY_WRITE, buf, len, 0);
+ (void) env; /* Used in arm softmmu lock_user implicitly */
+ if (!s) {
+ /* return bytes not read */
+ return len;
+ }
+ do {
+ ret = set_swi_errno(cs, read(gf->hostfd, s, len));
+ } while (ret == -1 && errno == EINTR);
+ unlock_user(s, buf, len);
+ if (ret == (uint32_t)-1) {
+ ret = 0;
+ }
+ /* Return bytes not read */
+ return len - ret;
+}
+
+static uint32_t host_isattyfn(CPUState *cs, GuestFD *gf)
+{
+ return isatty(gf->hostfd);
+}
+
+static uint32_t host_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
+{
+ uint32_t ret = set_swi_errno(cs, lseek(gf->hostfd, offset, SEEK_SET));
+ if (ret == (uint32_t)-1) {
+ return -1;
+ }
+ return 0;
+}
+
+static uint32_t host_flenfn(CPUState *cs, GuestFD *gf)
+{
+ struct stat buf;
+ uint32_t ret = set_swi_errno(cs, fstat(gf->hostfd, &buf));
+ if (ret == (uint32_t)-1) {
+ return -1;
+ }
+ return buf.st_size;
+}
+
+static uint32_t gdb_closefn(CPUState *cs, GuestFD *gf)
+{
+ return common_semi_gdb_syscall(cs, common_semi_cb, "close,%x", gf->hostfd);
+}
+
+static uint32_t gdb_writefn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len)
+{
+ common_semi_syscall_len = len;
+ return common_semi_gdb_syscall(cs, common_semi_cb, "write,%x,%x,%x",
+ gf->hostfd, buf, len);
+}
+
+static uint32_t gdb_readfn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len)
+{
+ common_semi_syscall_len = len;
+ return common_semi_gdb_syscall(cs, common_semi_cb, "read,%x,%x,%x",
+ gf->hostfd, buf, len);
+}
+
+static uint32_t gdb_isattyfn(CPUState *cs, GuestFD *gf)
+{
+ return common_semi_gdb_syscall(cs, common_semi_cb, "isatty,%x", gf->hostfd);
+}
+
+static uint32_t gdb_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
+{
+ return common_semi_gdb_syscall(cs, common_semi_cb, "lseek,%x,%x,0",
+ gf->hostfd, offset);
+}
+
+static uint32_t gdb_flenfn(CPUState *cs, GuestFD *gf)
+{
+ return common_semi_gdb_syscall(cs, common_semi_flen_cb, "fstat,%x,%x",
+ gf->hostfd, common_semi_flen_buf(cs));
+}
+
+#define SHFB_MAGIC_0 0x53
+#define SHFB_MAGIC_1 0x48
+#define SHFB_MAGIC_2 0x46
+#define SHFB_MAGIC_3 0x42
+
+/* Feature bits reportable in feature byte 0 */
+#define SH_EXT_EXIT_EXTENDED (1 << 0)
+#define SH_EXT_STDOUT_STDERR (1 << 1)
+
+static const uint8_t featurefile_data[] = {
+ SHFB_MAGIC_0,
+ SHFB_MAGIC_1,
+ SHFB_MAGIC_2,
+ SHFB_MAGIC_3,
+ SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */
+};
+
+static void init_featurefile_guestfd(int guestfd)
+{
+ GuestFD *gf = do_get_guestfd(guestfd);
+
+ assert(gf);
+ gf->type = GuestFDFeatureFile;
+ gf->featurefile_offset = 0;
+}
+
+static uint32_t featurefile_closefn(CPUState *cs, GuestFD *gf)
+{
+ /* Nothing to do */
+ return 0;
+}
+
+static uint32_t featurefile_writefn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len)
+{
+ /* This fd can never be open for writing */
+
+ errno = EBADF;
+ return set_swi_errno(cs, -1);
+}
+
+static uint32_t featurefile_readfn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len)
+{
+ CPUArchState *env = cs->env_ptr;
+ uint32_t i;
+ char *s;
+
+ (void) env; /* Used in arm softmmu lock_user implicitly */
+ s = lock_user(VERIFY_WRITE, buf, len, 0);
+ if (!s) {
+ return len;
+ }
+
+ for (i = 0; i < len; i++) {
+ if (gf->featurefile_offset >= sizeof(featurefile_data)) {
+ break;
+ }
+ s[i] = featurefile_data[gf->featurefile_offset];
+ gf->featurefile_offset++;
+ }
+
+ unlock_user(s, buf, len);
+
+ /* Return number of bytes not read */
+ return len - i;
+}
+
+static uint32_t featurefile_isattyfn(CPUState *cs, GuestFD *gf)
+{
+ return 0;
+}
+
+static uint32_t featurefile_seekfn(CPUState *cs, GuestFD *gf,
+ target_ulong offset)
+{
+ gf->featurefile_offset = offset;
+ return 0;
+}
+
+static uint32_t featurefile_flenfn(CPUState *cs, GuestFD *gf)
+{
+ return sizeof(featurefile_data);
+}
+
+typedef struct GuestFDFunctions {
+ sys_closefn *closefn;
+ sys_writefn *writefn;
+ sys_readfn *readfn;
+ sys_isattyfn *isattyfn;
+ sys_seekfn *seekfn;
+ sys_flenfn *flenfn;
+} GuestFDFunctions;
+
+static const GuestFDFunctions guestfd_fns[] = {
+ [GuestFDHost] = {
+ .closefn = host_closefn,
+ .writefn = host_writefn,
+ .readfn = host_readfn,
+ .isattyfn = host_isattyfn,
+ .seekfn = host_seekfn,
+ .flenfn = host_flenfn,
+ },
+ [GuestFDGDB] = {
+ .closefn = gdb_closefn,
+ .writefn = gdb_writefn,
+ .readfn = gdb_readfn,
+ .isattyfn = gdb_isattyfn,
+ .seekfn = gdb_seekfn,
+ .flenfn = gdb_flenfn,
+ },
+ [GuestFDFeatureFile] = {
+ .closefn = featurefile_closefn,
+ .writefn = featurefile_writefn,
+ .readfn = featurefile_readfn,
+ .isattyfn = featurefile_isattyfn,
+ .seekfn = featurefile_seekfn,
+ .flenfn = featurefile_flenfn,
+ },
+};
+
+/* Read the input value from the argument block; fail the semihosting
+ * call if the memory read fails.
+ */
+#ifdef TARGET_ARM
+#define GET_ARG(n) do { \
+ if (is_a64(env)) { \
+ if (get_user_u64(arg ## n, args + (n) * 8)) { \
+ errno = EFAULT; \
+ return set_swi_errno(cs, -1); \
+ } \
+ } else { \
+ if (get_user_u32(arg ## n, args + (n) * 4)) { \
+ errno = EFAULT; \
+ return set_swi_errno(cs, -1); \
+ } \
+ } \
+} while (0)
+
+#define SET_ARG(n, val) \
+ (is_a64(env) ? \
+ put_user_u64(val, args + (n) * 8) : \
+ put_user_u32(val, args + (n) * 4))
+#endif
+
+#ifdef TARGET_RISCV
+
+/*
+ * get_user_ual is defined as get_user_u32 in softmmu-semi.h,
+ * we need a macro that fetches a target_ulong
+ */
+#define get_user_utl(arg, p) \
+ ((sizeof(target_ulong) == 8) ? \
+ get_user_u64(arg, p) : \
+ get_user_u32(arg, p))
+
+/*
+ * put_user_ual is defined as put_user_u32 in softmmu-semi.h,
+ * we need a macro that stores a target_ulong
+ */
+#define put_user_utl(arg, p) \
+ ((sizeof(target_ulong) == 8) ? \
+ put_user_u64(arg, p) : \
+ put_user_u32(arg, p))
+
+#define GET_ARG(n) do { \
+ if (get_user_utl(arg ## n, args + (n) * sizeof(target_ulong))) { \
+ errno = EFAULT; \
+ return set_swi_errno(cs, -1); \
+ } \
+ } while (0)
+
+#define SET_ARG(n, val) \
+ put_user_utl(val, args + (n) * sizeof(target_ulong))
+#endif
+
+/*
+ * Do a semihosting call.
+ *
+ * The specification always says that the "return register" either
+ * returns a specific value or is corrupted, so we don't need to
+ * report to our caller whether we are returning a value or trying to
+ * leave the register unchanged. We use 0xdeadbeef as the return value
+ * when there isn't a defined return value for the call.
+ */
+target_ulong do_common_semihosting(CPUState *cs)
+{
+ CPUArchState *env = cs->env_ptr;
+ target_ulong args;
+ target_ulong arg0, arg1, arg2, arg3;
+ target_ulong ul_ret;
+ char * s;
+ int nr;
+ uint32_t ret;
+ uint32_t len;
+ GuestFD *gf;
+ int64_t elapsed;
+
+ (void) env; /* Used implicitly by arm lock_user macro */
+ nr = common_semi_arg(cs, 0) & 0xffffffffU;
+ args = common_semi_arg(cs, 1);
+
+ switch (nr) {
+ case TARGET_SYS_OPEN:
+ {
+ int guestfd;
+
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ s = lock_user_string(arg0);
+ if (!s) {
+ errno = EFAULT;
+ return set_swi_errno(cs, -1);
+ }
+ if (arg1 >= 12) {
+ unlock_user(s, arg0, 0);
+ errno = EINVAL;
+ return set_swi_errno(cs, -1);
+ }
+
+ guestfd = alloc_guestfd();
+ if (guestfd < 0) {
+ unlock_user(s, arg0, 0);
+ errno = EMFILE;
+ return set_swi_errno(cs, -1);
+ }
+
+ if (strcmp(s, ":tt") == 0) {
+ int result_fileno;
+
+ /*
+ * We implement SH_EXT_STDOUT_STDERR, so:
+ * open for read == stdin
+ * open for write == stdout
+ * open for append == stderr
+ */
+ if (arg1 < 4) {
+ result_fileno = STDIN_FILENO;
+ } else if (arg1 < 8) {
+ result_fileno = STDOUT_FILENO;
+ } else {
+ result_fileno = STDERR_FILENO;
+ }
+ associate_guestfd(guestfd, result_fileno);
+ unlock_user(s, arg0, 0);
+ return guestfd;
+ }
+ if (strcmp(s, ":semihosting-features") == 0) {
+ unlock_user(s, arg0, 0);
+ /* We must fail opens for modes other than 0 ('r') or 1 ('rb') */
+ if (arg1 != 0 && arg1 != 1) {
+ dealloc_guestfd(guestfd);
+ errno = EACCES;
+ return set_swi_errno(cs, -1);
+ }
+ init_featurefile_guestfd(guestfd);
+ return guestfd;
+ }
+
+ if (use_gdb_syscalls()) {
+ common_semi_open_guestfd = guestfd;
+ ret = common_semi_gdb_syscall(cs, common_semi_open_cb,
+ "open,%s,%x,1a4", arg0, (int)arg2 + 1,
+ gdb_open_modeflags[arg1]);
+ } else {
+ ret = set_swi_errno(cs, open(s, open_modeflags[arg1], 0644));
+ if (ret == (uint32_t)-1) {
+ dealloc_guestfd(guestfd);
+ } else {
+ associate_guestfd(guestfd, ret);
+ ret = guestfd;
+ }
+ }
+ unlock_user(s, arg0, 0);
+ return ret;
+ }
+ case TARGET_SYS_CLOSE:
+ GET_ARG(0);
+
+ gf = get_guestfd(arg0);
+ if (!gf) {
+ errno = EBADF;
+ return set_swi_errno(cs, -1);
+ }
+
+ ret = guestfd_fns[gf->type].closefn(cs, gf);
+ dealloc_guestfd(arg0);
+ return ret;
+ case TARGET_SYS_WRITEC:
+ qemu_semihosting_console_outc(cs->env_ptr, args);
+ return 0xdeadbeef;
+ case TARGET_SYS_WRITE0:
+ return qemu_semihosting_console_outs(cs->env_ptr, args);
+ case TARGET_SYS_WRITE:
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ len = arg2;
+
+ gf = get_guestfd(arg0);
+ if (!gf) {
+ errno = EBADF;
+ return set_swi_errno(cs, -1);
+ }
+
+ return guestfd_fns[gf->type].writefn(cs, gf, arg1, len);
+ case TARGET_SYS_READ:
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ len = arg2;
+
+ gf = get_guestfd(arg0);
+ if (!gf) {
+ errno = EBADF;
+ return set_swi_errno(cs, -1);
+ }
+
+ return guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
+ case TARGET_SYS_READC:
+ return qemu_semihosting_console_inc(cs->env_ptr);
+ case TARGET_SYS_ISERROR:
+ GET_ARG(0);
+ return (target_long) arg0 < 0 ? 1 : 0;
+ case TARGET_SYS_ISTTY:
+ GET_ARG(0);
+
+ gf = get_guestfd(arg0);
+ if (!gf) {
+ errno = EBADF;
+ return set_swi_errno(cs, -1);
+ }
+
+ return guestfd_fns[gf->type].isattyfn(cs, gf);
+ case TARGET_SYS_SEEK:
+ GET_ARG(0);
+ GET_ARG(1);
+
+ gf = get_guestfd(arg0);
+ if (!gf) {
+ errno = EBADF;
+ return set_swi_errno(cs, -1);
+ }
+
+ return guestfd_fns[gf->type].seekfn(cs, gf, arg1);
+ case TARGET_SYS_FLEN:
+ GET_ARG(0);
+
+ gf = get_guestfd(arg0);
+ if (!gf) {
+ errno = EBADF;
+ return set_swi_errno(cs, -1);
+ }
+
+ return guestfd_fns[gf->type].flenfn(cs, gf);
+ case TARGET_SYS_TMPNAM:
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ if (asprintf(&s, "/tmp/qemu-%x%02x", getpid(),
+ (int) (arg1 & 0xff)) < 0) {
+ return -1;
+ }
+ ul_ret = (target_ulong) -1;
+
+ /* Make sure there's enough space in the buffer */
+ if (strlen(s) < arg2) {
+ char *output = lock_user(VERIFY_WRITE, arg0, arg2, 0);
+ strcpy(output, s);
+ unlock_user(output, arg0, arg2);
+ ul_ret = 0;
+ }
+ free(s);
+ return ul_ret;
+ case TARGET_SYS_REMOVE:
+ GET_ARG(0);
+ GET_ARG(1);
+ if (use_gdb_syscalls()) {
+ ret = common_semi_gdb_syscall(cs, common_semi_cb, "unlink,%s",
+ arg0, (int)arg1 + 1);
+ } else {
+ s = lock_user_string(arg0);
+ if (!s) {
+ errno = EFAULT;
+ return set_swi_errno(cs, -1);
+ }
+ ret = set_swi_errno(cs, remove(s));
+ unlock_user(s, arg0, 0);
+ }
+ return ret;
+ case TARGET_SYS_RENAME:
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ GET_ARG(3);
+ if (use_gdb_syscalls()) {
+ return common_semi_gdb_syscall(cs, common_semi_cb, "rename,%s,%s",
+ arg0, (int)arg1 + 1, arg2,
+ (int)arg3 + 1);
+ } else {
+ char *s2;
+ s = lock_user_string(arg0);
+ s2 = lock_user_string(arg2);
+ if (!s || !s2) {
+ errno = EFAULT;
+ ret = set_swi_errno(cs, -1);
+ } else {
+ ret = set_swi_errno(cs, rename(s, s2));
+ }
+ if (s2)
+ unlock_user(s2, arg2, 0);
+ if (s)
+ unlock_user(s, arg0, 0);
+ return ret;
+ }
+ case TARGET_SYS_CLOCK:
+ return clock() / (CLOCKS_PER_SEC / 100);
+ case TARGET_SYS_TIME:
+ return set_swi_errno(cs, time(NULL));
+ case TARGET_SYS_SYSTEM:
+ GET_ARG(0);
+ GET_ARG(1);
+ if (use_gdb_syscalls()) {
+ return common_semi_gdb_syscall(cs, common_semi_cb, "system,%s",
+ arg0, (int)arg1 + 1);
+ } else {
+ s = lock_user_string(arg0);
+ if (!s) {
+ errno = EFAULT;
+ return set_swi_errno(cs, -1);
+ }
+ ret = set_swi_errno(cs, system(s));
+ unlock_user(s, arg0, 0);
+ return ret;
+ }
+ case TARGET_SYS_ERRNO:
+ return get_swi_errno(cs);
+ case TARGET_SYS_GET_CMDLINE:
+ {
+ /* Build a command-line from the original argv.
+ *
+ * The inputs are:
+ * * arg0, pointer to a buffer of at least the size
+ * specified in arg1.
+ * * arg1, size of the buffer pointed to by arg0 in
+ * bytes.
+ *
+ * The outputs are:
+ * * arg0, pointer to null-terminated string of the
+ * command line.
+ * * arg1, length of the string pointed to by arg0.
+ */
+
+ char *output_buffer;
+ size_t input_size;
+ size_t output_size;
+ int status = 0;
+#if !defined(CONFIG_USER_ONLY)
+ const char *cmdline;
+#else
+ TaskState *ts = cs->opaque;
+#endif
+ GET_ARG(0);
+ GET_ARG(1);
+ input_size = arg1;
+ /* Compute the size of the output string. */
+#if !defined(CONFIG_USER_ONLY)
+ cmdline = semihosting_get_cmdline();
+ if (cmdline == NULL) {
+ cmdline = ""; /* Default to an empty line. */
+ }
+ output_size = strlen(cmdline) + 1; /* Count terminating 0. */
+#else
+ unsigned int i;
+
+ output_size = ts->info->arg_end - ts->info->arg_start;
+ if (!output_size) {
+ /*
+ * We special-case the "empty command line" case (argc==0).
+ * Just provide the terminating 0.
+ */
+ output_size = 1;
+ }
+#endif
+
+ if (output_size > input_size) {
+ /* Not enough space to store command-line arguments. */
+ errno = E2BIG;
+ return set_swi_errno(cs, -1);
+ }
+
+ /* Adjust the command-line length. */
+ if (SET_ARG(1, output_size - 1)) {
+ /* Couldn't write back to argument block */
+ errno = EFAULT;
+ return set_swi_errno(cs, -1);
+ }
+
+ /* Lock the buffer on the ARM side. */
+ output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
+ if (!output_buffer) {
+ errno = EFAULT;
+ return set_swi_errno(cs, -1);
+ }
+
+ /* Copy the command-line arguments. */
+#if !defined(CONFIG_USER_ONLY)
+ pstrcpy(output_buffer, output_size, cmdline);
+#else
+ if (output_size == 1) {
+ /* Empty command-line. */
+ output_buffer[0] = '\0';
+ goto out;
+ }
+
+ if (copy_from_user(output_buffer, ts->info->arg_start,
+ output_size)) {
+ errno = EFAULT;
+ status = set_swi_errno(cs, -1);
+ goto out;
+ }
+
+ /* Separate arguments by white spaces. */
+ for (i = 0; i < output_size - 1; i++) {
+ if (output_buffer[i] == 0) {
+ output_buffer[i] = ' ';
+ }
+ }
+ out:
+#endif
+ /* Unlock the buffer on the ARM side. */
+ unlock_user(output_buffer, arg0, output_size);
+
+ return status;
+ }
+ case TARGET_SYS_HEAPINFO:
+ {
+ target_ulong retvals[4];
+ target_ulong limit;
+ int i;
+#ifdef CONFIG_USER_ONLY
+ TaskState *ts = cs->opaque;
+#else
+ target_ulong rambase = common_semi_rambase(cs);
+#endif
+
+ GET_ARG(0);
+
+#ifdef CONFIG_USER_ONLY
+ /*
+ * Some C libraries assume the heap immediately follows .bss, so
+ * allocate it using sbrk.
+ */
+ if (!ts->heap_limit) {
+ abi_ulong ret;
+
+ ts->heap_base = do_brk(0);
+ limit = ts->heap_base + COMMON_SEMI_HEAP_SIZE;
+ /* Try a big heap, and reduce the size if that fails. */
+ for (;;) {
+ ret = do_brk(limit);
+ if (ret >= limit) {
+ break;
+ }
+ limit = (ts->heap_base >> 1) + (limit >> 1);
+ }
+ ts->heap_limit = limit;
+ }
+
+ retvals[0] = ts->heap_base;
+ retvals[1] = ts->heap_limit;
+ retvals[2] = ts->stack_base;
+ retvals[3] = 0; /* Stack limit. */
+#else
+ limit = current_machine->ram_size;
+ /* TODO: Make this use the limit of the loaded application. */
+ retvals[0] = rambase + limit / 2;
+ retvals[1] = rambase + limit;
+ retvals[2] = rambase + limit; /* Stack base */
+ retvals[3] = rambase; /* Stack limit. */
+#endif
+
+ for (i = 0; i < ARRAY_SIZE(retvals); i++) {
+ bool fail;
+
+ fail = SET_ARG(i, retvals[i]);
+
+ if (fail) {
+ /* Couldn't write back to argument block */
+ errno = EFAULT;
+ return set_swi_errno(cs, -1);
+ }
+ }
+ return 0;
+ }
+ case TARGET_SYS_EXIT:
+ case TARGET_SYS_EXIT_EXTENDED:
+ if (common_semi_sys_exit_extended(cs, nr)) {
+ /*
+ * The A64 version of SYS_EXIT takes a parameter block,
+ * so the application-exit type can return a subcode which
+ * is the exit status code from the application.
+ * SYS_EXIT_EXTENDED is an a new-in-v2.0 optional function
+ * which allows A32/T32 guests to also provide a status code.
+ */
+ GET_ARG(0);
+ GET_ARG(1);
+
+ if (arg0 == ADP_Stopped_ApplicationExit) {
+ ret = arg1;
+ } else {
+ ret = 1;
+ }
+ } else {
+ /*
+ * The A32/T32 version of SYS_EXIT specifies only
+ * Stopped_ApplicationExit as normal exit, but does not
+ * allow the guest to specify the exit status code.
+ * Everything else is considered an error.
+ */
+ ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
+ }
+ gdb_exit(ret);
+ exit(ret);
+ case TARGET_SYS_ELAPSED:
+ elapsed = get_clock() - clock_start;
+ if (sizeof(target_ulong) == 8) {
+ SET_ARG(0, elapsed);
+ } else {
+ SET_ARG(0, (uint32_t) elapsed);
+ SET_ARG(1, (uint32_t) (elapsed >> 32));
+ }
+ return 0;
+ case TARGET_SYS_TICKFREQ:
+ /* qemu always uses nsec */
+ return 1000000000;
+ case TARGET_SYS_SYNCCACHE:
+ /*
+ * Clean the D-cache and invalidate the I-cache for the specified
+ * virtual address range. This is a nop for us since we don't
+ * implement caches. This is only present on A64.
+ */
+#ifdef TARGET_ARM
+ if (is_a64(cs->env_ptr)) {
+ return 0;
+ }
+#endif
+#ifdef TARGET_RISCV
+ return 0;
+#endif
+ /* fall through -- invalid for A32/T32 */
+ default:
+ fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
+ cpu_dump_state(cs, stderr, 0);
+ abort();
+ }
+}
--- /dev/null
+/*
+ * Semihosting support for systems modeled on the Arm "Angel"
+ * semihosting syscalls design. This includes Arm and RISC-V processors
+ *
+ * Copyright (c) 2005, 2007 CodeSourcery.
+ * Copyright (c) 2019 Linaro
+ * Written by Paul Brook.
+ *
+ * Copyright © 2020 by Keith Packard <keithp@keithp.com>
+ * Adapted for systems other than ARM, including RISC-V, by Keith Packard
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * ARM Semihosting is documented in:
+ * Semihosting for AArch32 and AArch64 Release 2.0
+ * https://static.docs.arm.com/100863/0200/semihosting.pdf
+ *
+ * RISC-V Semihosting is documented in:
+ * RISC-V Semihosting
+ * https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc
+ */
+
+#ifndef COMMON_SEMI_H
+#define COMMON_SEMI_H
+
+target_ulong do_common_semihosting(CPUState *cs);
+
+#endif /* COMMON_SEMI_H */
--- /dev/null
+/*
+ * Semihosting configuration
+ *
+ * Copyright (c) 2015 Imagination Technologies
+ * Copyright (c) 2019 Linaro Ltd
+ *
+ * This controls the configuration of semihosting for all guest
+ * targets that support it. Architecture specific handling is handled
+ * in target/HW/HW-semi.c
+ *
+ * Semihosting is sightly strange in that it is also supported by some
+ * linux-user targets. However in that use case no configuration of
+ * the outputs and command lines is supported.
+ *
+ * The config module is common to all softmmu targets however as vl.c
+ * needs to link against the helpers.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/option.h"
+#include "qemu/config-file.h"
+#include "qemu/error-report.h"
+#include "semihosting/semihost.h"
+#include "chardev/char.h"
+#include "sysemu/sysemu.h"
+
+QemuOptsList qemu_semihosting_config_opts = {
+ .name = "semihosting-config",
+ .implied_opt_name = "enable",
+ .head = QTAILQ_HEAD_INITIALIZER(qemu_semihosting_config_opts.head),
+ .desc = {
+ {
+ .name = "enable",
+ .type = QEMU_OPT_BOOL,
+ }, {
+ .name = "target",
+ .type = QEMU_OPT_STRING,
+ }, {
+ .name = "chardev",
+ .type = QEMU_OPT_STRING,
+ }, {
+ .name = "arg",
+ .type = QEMU_OPT_STRING,
+ },
+ { /* end of list */ }
+ },
+};
+
+typedef struct SemihostingConfig {
+ bool enabled;
+ SemihostingTarget target;
+ Chardev *chardev;
+ const char **argv;
+ int argc;
+ const char *cmdline; /* concatenated argv */
+} SemihostingConfig;
+
+static SemihostingConfig semihosting;
+static const char *semihost_chardev;
+
+bool semihosting_enabled(void)
+{
+ return semihosting.enabled;
+}
+
+SemihostingTarget semihosting_get_target(void)
+{
+ return semihosting.target;
+}
+
+const char *semihosting_get_arg(int i)
+{
+ if (i >= semihosting.argc) {
+ return NULL;
+ }
+ return semihosting.argv[i];
+}
+
+int semihosting_get_argc(void)
+{
+ return semihosting.argc;
+}
+
+const char *semihosting_get_cmdline(void)
+{
+ if (semihosting.cmdline == NULL && semihosting.argc > 0) {
+ semihosting.cmdline = g_strjoinv(" ", (gchar **)semihosting.argv);
+ }
+ return semihosting.cmdline;
+}
+
+static int add_semihosting_arg(void *opaque,
+ const char *name, const char *val,
+ Error **errp)
+{
+ SemihostingConfig *s = opaque;
+ if (strcmp(name, "arg") == 0) {
+ s->argc++;
+ /* one extra element as g_strjoinv() expects NULL-terminated array */
+ s->argv = g_realloc(s->argv, (s->argc + 1) * sizeof(void *));
+ s->argv[s->argc - 1] = val;
+ s->argv[s->argc] = NULL;
+ }
+ return 0;
+}
+
+/* Use strings passed via -kernel/-append to initialize semihosting.argv[] */
+void semihosting_arg_fallback(const char *file, const char *cmd)
+{
+ char *cmd_token;
+
+ /* argv[0] */
+ add_semihosting_arg(&semihosting, "arg", file, NULL);
+
+ /* split -append and initialize argv[1..n] */
+ cmd_token = strtok(g_strdup(cmd), " ");
+ while (cmd_token) {
+ add_semihosting_arg(&semihosting, "arg", cmd_token, NULL);
+ cmd_token = strtok(NULL, " ");
+ }
+}
+
+Chardev *semihosting_get_chardev(void)
+{
+ return semihosting.chardev;
+}
+
+void qemu_semihosting_enable(void)
+{
+ semihosting.enabled = true;
+ semihosting.target = SEMIHOSTING_TARGET_AUTO;
+}
+
+int qemu_semihosting_config_options(const char *optarg)
+{
+ QemuOptsList *opt_list = qemu_find_opts("semihosting-config");
+ QemuOpts *opts = qemu_opts_parse_noisily(opt_list, optarg, false);
+
+ semihosting.enabled = true;
+
+ if (opts != NULL) {
+ semihosting.enabled = qemu_opt_get_bool(opts, "enable",
+ true);
+ const char *target = qemu_opt_get(opts, "target");
+ /* setup of chardev is deferred until they are initialised */
+ semihost_chardev = qemu_opt_get(opts, "chardev");
+ if (target != NULL) {
+ if (strcmp("native", target) == 0) {
+ semihosting.target = SEMIHOSTING_TARGET_NATIVE;
+ } else if (strcmp("gdb", target) == 0) {
+ semihosting.target = SEMIHOSTING_TARGET_GDB;
+ } else if (strcmp("auto", target) == 0) {
+ semihosting.target = SEMIHOSTING_TARGET_AUTO;
+ } else {
+ error_report("unsupported semihosting-config %s",
+ optarg);
+ return 1;
+ }
+ } else {
+ semihosting.target = SEMIHOSTING_TARGET_AUTO;
+ }
+ /* Set semihosting argument count and vector */
+ qemu_opt_foreach(opts, add_semihosting_arg,
+ &semihosting, NULL);
+ } else {
+ error_report("unsupported semihosting-config %s", optarg);
+ return 1;
+ }
+
+ return 0;
+}
+
+void qemu_semihosting_connect_chardevs(void)
+{
+ /* We had to defer this until chardevs were created */
+ if (semihost_chardev) {
+ Chardev *chr = qemu_chr_find(semihost_chardev);
+ if (chr == NULL) {
+ error_report("semihosting chardev '%s' not found",
+ semihost_chardev);
+ exit(1);
+ }
+ semihosting.chardev = chr;
+ }
+}
--- /dev/null
+/*
+ * Semihosting Console Support
+ *
+ * Copyright (c) 2015 Imagination Technologies
+ * Copyright (c) 2019 Linaro Ltd
+ *
+ * This provides support for outputting to a semihosting console.
+ *
+ * While most semihosting implementations support reading and writing
+ * to arbitrary file descriptors we treat the console as something
+ * specifically for debugging interaction. This means messages can be
+ * re-directed to gdb (if currently being used to debug) or even
+ * re-directed elsewhere.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "semihosting/semihost.h"
+#include "semihosting/console.h"
+#include "exec/gdbstub.h"
+#include "exec/exec-all.h"
+#include "qemu/log.h"
+#include "chardev/char.h"
+#include "chardev/char-fe.h"
+#include "sysemu/sysemu.h"
+#include "qemu/main-loop.h"
+#include "qapi/error.h"
+#include "qemu/fifo8.h"
+
+int qemu_semihosting_log_out(const char *s, int len)
+{
+ Chardev *chardev = semihosting_get_chardev();
+ if (chardev) {
+ return qemu_chr_write_all(chardev, (uint8_t *) s, len);
+ } else {
+ return write(STDERR_FILENO, s, len);
+ }
+}
+
+/*
+ * A re-implementation of lock_user_string that we can use locally
+ * instead of relying on softmmu-semi. Hopefully we can deprecate that
+ * in time. Copy string until we find a 0 or address error.
+ */
+static GString *copy_user_string(CPUArchState *env, target_ulong addr)
+{
+ CPUState *cpu = env_cpu(env);
+ GString *s = g_string_sized_new(128);
+ uint8_t c;
+
+ do {
+ if (cpu_memory_rw_debug(cpu, addr++, &c, 1, 0) == 0) {
+ if (c) {
+ s = g_string_append_c(s, c);
+ }
+ } else {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: passed inaccessible address " TARGET_FMT_lx,
+ __func__, addr);
+ break;
+ }
+ } while (c!=0);
+
+ return s;
+}
+
+static void semihosting_cb(CPUState *cs, target_ulong ret, target_ulong err)
+{
+ if (ret == (target_ulong) -1) {
+ qemu_log("%s: gdb console output failed ("TARGET_FMT_ld")",
+ __func__, err);
+ }
+}
+
+int qemu_semihosting_console_outs(CPUArchState *env, target_ulong addr)
+{
+ GString *s = copy_user_string(env, addr);
+ int out = s->len;
+
+ if (use_gdb_syscalls()) {
+ gdb_do_syscall(semihosting_cb, "write,2,%x,%x", addr, s->len);
+ } else {
+ out = qemu_semihosting_log_out(s->str, s->len);
+ }
+
+ g_string_free(s, true);
+ return out;
+}
+
+void qemu_semihosting_console_outc(CPUArchState *env, target_ulong addr)
+{
+ CPUState *cpu = env_cpu(env);
+ uint8_t c;
+
+ if (cpu_memory_rw_debug(cpu, addr, &c, 1, 0) == 0) {
+ if (use_gdb_syscalls()) {
+ gdb_do_syscall(semihosting_cb, "write,2,%x,%x", addr, 1);
+ } else {
+ qemu_semihosting_log_out((const char *) &c, 1);
+ }
+ } else {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: passed inaccessible address " TARGET_FMT_lx,
+ __func__, addr);
+ }
+}
+
+#define FIFO_SIZE 1024
+
+/* Access to this structure is protected by the BQL */
+typedef struct SemihostingConsole {
+ CharBackend backend;
+ GSList *sleeping_cpus;
+ bool got;
+ Fifo8 fifo;
+} SemihostingConsole;
+
+static SemihostingConsole console;
+
+static int console_can_read(void *opaque)
+{
+ SemihostingConsole *c = opaque;
+ int ret;
+ g_assert(qemu_mutex_iothread_locked());
+ ret = (int) fifo8_num_free(&c->fifo);
+ return ret;
+}
+
+static void console_wake_up(gpointer data, gpointer user_data)
+{
+ CPUState *cs = (CPUState *) data;
+ /* cpu_handle_halt won't know we have work so just unbung here */
+ cs->halted = 0;
+ qemu_cpu_kick(cs);
+}
+
+static void console_read(void *opaque, const uint8_t *buf, int size)
+{
+ SemihostingConsole *c = opaque;
+ g_assert(qemu_mutex_iothread_locked());
+ while (size-- && !fifo8_is_full(&c->fifo)) {
+ fifo8_push(&c->fifo, *buf++);
+ }
+ g_slist_foreach(c->sleeping_cpus, console_wake_up, NULL);
+ c->sleeping_cpus = NULL;
+}
+
+target_ulong qemu_semihosting_console_inc(CPUArchState *env)
+{
+ uint8_t ch;
+ SemihostingConsole *c = &console;
+ g_assert(qemu_mutex_iothread_locked());
+ g_assert(current_cpu);
+ if (fifo8_is_empty(&c->fifo)) {
+ c->sleeping_cpus = g_slist_prepend(c->sleeping_cpus, current_cpu);
+ current_cpu->halted = 1;
+ current_cpu->exception_index = EXCP_HALTED;
+ cpu_loop_exit(current_cpu);
+ /* never returns */
+ }
+ ch = fifo8_pop(&c->fifo);
+ return (target_ulong) ch;
+}
+
+void qemu_semihosting_console_init(void)
+{
+ Chardev *chr = semihosting_get_chardev();
+
+ if (chr) {
+ fifo8_create(&console.fifo, FIFO_SIZE);
+ qemu_chr_fe_init(&console.backend, chr, &error_abort);
+ qemu_chr_fe_set_handlers(&console.backend,
+ console_can_read,
+ console_read,
+ NULL, NULL, &console,
+ NULL, true);
+ }
+}
--- /dev/null
+specific_ss.add(when: 'CONFIG_SEMIHOSTING', if_true: files(
+ 'config.c',
+ 'console.c',
+))
+
+specific_ss.add(when: ['CONFIG_ARM_COMPATIBLE_SEMIHOSTING'],
+ if_true: files('arm-compat-semi.c'))
projects / qemu-xen.git / commitdiff