ia64/linux-2.6.18-xen.hg

view arch/mips/kernel/signal_n32.c @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 /*
2 * Copyright (C) 2003 Broadcom Corporation
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18 #include <linux/cache.h>
19 #include <linux/sched.h>
20 #include <linux/sched.h>
21 #include <linux/mm.h>
22 #include <linux/smp.h>
23 #include <linux/smp_lock.h>
24 #include <linux/kernel.h>
25 #include <linux/signal.h>
26 #include <linux/errno.h>
27 #include <linux/wait.h>
28 #include <linux/ptrace.h>
29 #include <linux/unistd.h>
30 #include <linux/compat.h>
31 #include <linux/bitops.h>
33 #include <asm/asm.h>
34 #include <asm/cacheflush.h>
35 #include <asm/sim.h>
36 #include <asm/uaccess.h>
37 #include <asm/ucontext.h>
38 #include <asm/system.h>
39 #include <asm/fpu.h>
40 #include <asm/cpu-features.h>
41 #include <asm/war.h>
43 #include "signal-common.h"
45 /*
46 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
47 */
48 #define __NR_N32_rt_sigreturn 6211
49 #define __NR_N32_restart_syscall 6214
51 #define DEBUG_SIG 0
53 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
55 /* IRIX compatible stack_t */
56 typedef struct sigaltstack32 {
57 s32 ss_sp;
58 compat_size_t ss_size;
59 int ss_flags;
60 } stack32_t;
62 struct ucontextn32 {
63 u32 uc_flags;
64 s32 uc_link;
65 stack32_t uc_stack;
66 struct sigcontext uc_mcontext;
67 sigset_t uc_sigmask; /* mask last for extensibility */
68 };
70 struct rt_sigframe_n32 {
71 u32 rs_ass[4]; /* argument save space for o32 */
72 #if ICACHE_REFILLS_WORKAROUND_WAR
73 u32 rs_pad[2];
74 #else
75 u32 rs_code[2]; /* signal trampoline */
76 #endif
77 struct siginfo rs_info;
78 struct ucontextn32 rs_uc;
79 #if ICACHE_REFILLS_WORKAROUND_WAR
80 u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
81 #endif
82 };
84 extern void sigset_from_compat (sigset_t *set, compat_sigset_t *compat);
86 save_static_function(sysn32_rt_sigsuspend);
87 __attribute_used__ noinline static int
88 _sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
89 {
90 compat_sigset_t __user *unewset;
91 compat_sigset_t uset;
92 size_t sigsetsize;
93 sigset_t newset;
95 /* XXX Don't preclude handling different sized sigset_t's. */
96 sigsetsize = regs.regs[5];
97 if (sigsetsize != sizeof(sigset_t))
98 return -EINVAL;
100 unewset = (compat_sigset_t __user *) regs.regs[4];
101 if (copy_from_user(&uset, unewset, sizeof(uset)))
102 return -EFAULT;
103 sigset_from_compat (&newset, &uset);
104 sigdelsetmask(&newset, ~_BLOCKABLE);
106 spin_lock_irq(&current->sighand->siglock);
107 current->saved_sigmask = current->blocked;
108 current->blocked = newset;
109 recalc_sigpending();
110 spin_unlock_irq(&current->sighand->siglock);
112 current->state = TASK_INTERRUPTIBLE;
113 schedule();
114 set_thread_flag(TIF_RESTORE_SIGMASK);
115 return -ERESTARTNOHAND;
116 }
118 save_static_function(sysn32_rt_sigreturn);
119 __attribute_used__ noinline static void
120 _sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
121 {
122 struct rt_sigframe_n32 __user *frame;
123 sigset_t set;
124 stack_t st;
125 s32 sp;
127 frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
128 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
129 goto badframe;
130 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
131 goto badframe;
133 sigdelsetmask(&set, ~_BLOCKABLE);
134 spin_lock_irq(&current->sighand->siglock);
135 current->blocked = set;
136 recalc_sigpending();
137 spin_unlock_irq(&current->sighand->siglock);
139 if (restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext))
140 goto badframe;
142 /* The ucontext contains a stack32_t, so we must convert! */
143 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
144 goto badframe;
145 st.ss_sp = (void __user *)(long) sp;
146 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
147 goto badframe;
148 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
149 goto badframe;
151 /* It is more difficult to avoid calling this function than to
152 call it and ignore errors. */
153 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
155 /*
156 * Don't let your children do this ...
157 */
158 __asm__ __volatile__(
159 "move\t$29, %0\n\t"
160 "j\tsyscall_exit"
161 :/* no outputs */
162 :"r" (&regs));
163 /* Unreached */
165 badframe:
166 force_sig(SIGSEGV, current);
167 }
169 int setup_rt_frame_n32(struct k_sigaction * ka,
170 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info)
171 {
172 struct rt_sigframe_n32 __user *frame;
173 int err = 0;
174 s32 sp;
176 frame = get_sigframe(ka, regs, sizeof(*frame));
177 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
178 goto give_sigsegv;
180 install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn);
182 /* Create siginfo. */
183 err |= copy_siginfo_to_user(&frame->rs_info, info);
185 /* Create the ucontext. */
186 err |= __put_user(0, &frame->rs_uc.uc_flags);
187 err |= __put_user(0, &frame->rs_uc.uc_link);
188 sp = (int) (long) current->sas_ss_sp;
189 err |= __put_user(sp,
190 &frame->rs_uc.uc_stack.ss_sp);
191 err |= __put_user(sas_ss_flags(regs->regs[29]),
192 &frame->rs_uc.uc_stack.ss_flags);
193 err |= __put_user(current->sas_ss_size,
194 &frame->rs_uc.uc_stack.ss_size);
195 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
196 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
198 if (err)
199 goto give_sigsegv;
201 /*
202 * Arguments to signal handler:
203 *
204 * a0 = signal number
205 * a1 = 0 (should be cause)
206 * a2 = pointer to ucontext
207 *
208 * $25 and c0_epc point to the signal handler, $29 points to
209 * the struct rt_sigframe.
210 */
211 regs->regs[ 4] = signr;
212 regs->regs[ 5] = (unsigned long) &frame->rs_info;
213 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
214 regs->regs[29] = (unsigned long) frame;
215 regs->regs[31] = (unsigned long) frame->rs_code;
216 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
218 #if DEBUG_SIG
219 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
220 current->comm, current->pid,
221 frame, regs->cp0_epc, regs->regs[31]);
222 #endif
223 return 0;
225 give_sigsegv:
226 force_sigsegv(signr, current);
227 return -EFAULT;
228 }