ia64/linux-2.6.18-xen.hg

view arch/um/sys-i386/signal.c @ 647:a5bb490065f6

Fix the build after public header sync.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Wed Aug 13 14:01:49 2008 +0100 (2008-08-13)
parents 831230e53067
children
line source
1 /*
2 * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
3 * Licensed under the GPL
4 */
6 #include "linux/signal.h"
7 #include "linux/ptrace.h"
8 #include "asm/current.h"
9 #include "asm/ucontext.h"
10 #include "asm/uaccess.h"
11 #include "asm/unistd.h"
12 #include "frame_kern.h"
13 #include "sigcontext.h"
14 #include "registers.h"
15 #include "mode.h"
17 #ifdef CONFIG_MODE_SKAS
19 #include "skas.h"
21 static int copy_sc_from_user_skas(struct pt_regs *regs,
22 struct sigcontext __user *from)
23 {
24 struct sigcontext sc;
25 unsigned long fpregs[HOST_FP_SIZE];
26 int err;
28 err = copy_from_user(&sc, from, sizeof(sc));
29 err |= copy_from_user(fpregs, sc.fpstate, sizeof(fpregs));
30 if(err)
31 return(err);
33 REGS_GS(regs->regs.skas.regs) = sc.gs;
34 REGS_FS(regs->regs.skas.regs) = sc.fs;
35 REGS_ES(regs->regs.skas.regs) = sc.es;
36 REGS_DS(regs->regs.skas.regs) = sc.ds;
37 REGS_EDI(regs->regs.skas.regs) = sc.edi;
38 REGS_ESI(regs->regs.skas.regs) = sc.esi;
39 REGS_EBP(regs->regs.skas.regs) = sc.ebp;
40 REGS_SP(regs->regs.skas.regs) = sc.esp;
41 REGS_EBX(regs->regs.skas.regs) = sc.ebx;
42 REGS_EDX(regs->regs.skas.regs) = sc.edx;
43 REGS_ECX(regs->regs.skas.regs) = sc.ecx;
44 REGS_EAX(regs->regs.skas.regs) = sc.eax;
45 REGS_IP(regs->regs.skas.regs) = sc.eip;
46 REGS_CS(regs->regs.skas.regs) = sc.cs;
47 REGS_EFLAGS(regs->regs.skas.regs) = sc.eflags;
48 REGS_SS(regs->regs.skas.regs) = sc.ss;
50 err = restore_fp_registers(userspace_pid[0], fpregs);
51 if(err < 0){
52 printk("copy_sc_from_user_skas - PTRACE_SETFPREGS failed, "
53 "errno = %d\n", err);
54 return(1);
55 }
57 return(0);
58 }
60 int copy_sc_to_user_skas(struct sigcontext __user *to, struct _fpstate __user *to_fp,
61 struct pt_regs *regs, unsigned long sp)
62 {
63 struct sigcontext sc;
64 unsigned long fpregs[HOST_FP_SIZE];
65 struct faultinfo * fi = &current->thread.arch.faultinfo;
66 int err;
68 sc.gs = REGS_GS(regs->regs.skas.regs);
69 sc.fs = REGS_FS(regs->regs.skas.regs);
70 sc.es = REGS_ES(regs->regs.skas.regs);
71 sc.ds = REGS_DS(regs->regs.skas.regs);
72 sc.edi = REGS_EDI(regs->regs.skas.regs);
73 sc.esi = REGS_ESI(regs->regs.skas.regs);
74 sc.ebp = REGS_EBP(regs->regs.skas.regs);
75 sc.esp = sp;
76 sc.ebx = REGS_EBX(regs->regs.skas.regs);
77 sc.edx = REGS_EDX(regs->regs.skas.regs);
78 sc.ecx = REGS_ECX(regs->regs.skas.regs);
79 sc.eax = REGS_EAX(regs->regs.skas.regs);
80 sc.eip = REGS_IP(regs->regs.skas.regs);
81 sc.cs = REGS_CS(regs->regs.skas.regs);
82 sc.eflags = REGS_EFLAGS(regs->regs.skas.regs);
83 sc.esp_at_signal = regs->regs.skas.regs[UESP];
84 sc.ss = regs->regs.skas.regs[SS];
85 sc.cr2 = fi->cr2;
86 sc.err = fi->error_code;
87 sc.trapno = fi->trap_no;
89 err = save_fp_registers(userspace_pid[0], fpregs);
90 if(err < 0){
91 printk("copy_sc_to_user_skas - PTRACE_GETFPREGS failed, "
92 "errno = %d\n", err);
93 return(1);
94 }
95 to_fp = (to_fp ? to_fp : (struct _fpstate __user *) (to + 1));
96 sc.fpstate = to_fp;
98 if(err)
99 return(err);
101 return(copy_to_user(to, &sc, sizeof(sc)) ||
102 copy_to_user(to_fp, fpregs, sizeof(fpregs)));
103 }
104 #endif
106 #ifdef CONFIG_MODE_TT
108 /* These copy a sigcontext to/from userspace. They copy the fpstate pointer,
109 * blowing away the old, good one. So, that value is saved, and then restored
110 * after the sigcontext copy. In copy_from, the variable holding the saved
111 * fpstate pointer, and the sigcontext that it should be restored to are both
112 * in the kernel, so we can just restore using an assignment. In copy_to, the
113 * saved pointer is in the kernel, but the sigcontext is in userspace, so we
114 * copy_to_user it.
115 */
116 int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext __user *from,
117 int fpsize)
118 {
119 struct _fpstate *to_fp;
120 struct _fpstate __user *from_fp;
121 unsigned long sigs;
122 int err;
124 to_fp = to->fpstate;
125 sigs = to->oldmask;
126 err = copy_from_user(to, from, sizeof(*to));
127 from_fp = to->fpstate;
128 to->oldmask = sigs;
129 to->fpstate = to_fp;
130 if(to_fp != NULL)
131 err |= copy_from_user(to_fp, from_fp, fpsize);
132 return(err);
133 }
135 int copy_sc_to_user_tt(struct sigcontext __user *to, struct _fpstate __user *fp,
136 struct sigcontext *from, int fpsize, unsigned long sp)
137 {
138 struct _fpstate __user *to_fp;
139 struct _fpstate *from_fp;
140 int err;
142 to_fp = (fp ? fp : (struct _fpstate __user *) (to + 1));
143 from_fp = from->fpstate;
144 err = copy_to_user(to, from, sizeof(*to));
146 /* The SP in the sigcontext is the updated one for the signal
147 * delivery. The sp passed in is the original, and this needs
148 * to be restored, so we stick it in separately.
149 */
150 err |= copy_to_user(&SC_SP(to), &sp, sizeof(sp));
152 if(from_fp != NULL){
153 err |= copy_to_user(&to->fpstate, &to_fp, sizeof(to->fpstate));
154 err |= copy_to_user(to_fp, from_fp, fpsize);
155 }
156 return err;
157 }
158 #endif
160 static int copy_sc_from_user(struct pt_regs *to, void __user *from)
161 {
162 int ret;
164 ret = CHOOSE_MODE(copy_sc_from_user_tt(UPT_SC(&to->regs), from,
165 sizeof(struct _fpstate)),
166 copy_sc_from_user_skas(to, from));
167 return(ret);
168 }
170 static int copy_sc_to_user(struct sigcontext __user *to, struct _fpstate __user *fp,
171 struct pt_regs *from, unsigned long sp)
172 {
173 return(CHOOSE_MODE(copy_sc_to_user_tt(to, fp, UPT_SC(&from->regs),
174 sizeof(*fp), sp),
175 copy_sc_to_user_skas(to, fp, from, sp)));
176 }
178 static int copy_ucontext_to_user(struct ucontext __user *uc, struct _fpstate __user *fp,
179 sigset_t *set, unsigned long sp)
180 {
181 int err = 0;
183 err |= put_user(current->sas_ss_sp, &uc->uc_stack.ss_sp);
184 err |= put_user(sas_ss_flags(sp), &uc->uc_stack.ss_flags);
185 err |= put_user(current->sas_ss_size, &uc->uc_stack.ss_size);
186 err |= copy_sc_to_user(&uc->uc_mcontext, fp, &current->thread.regs, sp);
187 err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set));
188 return(err);
189 }
191 struct sigframe
192 {
193 char __user *pretcode;
194 int sig;
195 struct sigcontext sc;
196 struct _fpstate fpstate;
197 unsigned long extramask[_NSIG_WORDS-1];
198 char retcode[8];
199 };
201 struct rt_sigframe
202 {
203 char __user *pretcode;
204 int sig;
205 struct siginfo __user *pinfo;
206 void __user *puc;
207 struct siginfo info;
208 struct ucontext uc;
209 struct _fpstate fpstate;
210 char retcode[8];
211 };
213 int setup_signal_stack_sc(unsigned long stack_top, int sig,
214 struct k_sigaction *ka, struct pt_regs *regs,
215 sigset_t *mask)
216 {
217 struct sigframe __user *frame;
218 void __user *restorer;
219 unsigned long save_sp = PT_REGS_SP(regs);
220 int err = 0;
222 stack_top &= -8UL;
223 frame = (struct sigframe __user *) stack_top - 1;
224 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
225 return 1;
227 restorer = frame->retcode;
228 if(ka->sa.sa_flags & SA_RESTORER)
229 restorer = ka->sa.sa_restorer;
231 /* Update SP now because the page fault handler refuses to extend
232 * the stack if the faulting address is too far below the current
233 * SP, which frame now certainly is. If there's an error, the original
234 * value is restored on the way out.
235 * When writing the sigcontext to the stack, we have to write the
236 * original value, so that's passed to copy_sc_to_user, which does
237 * the right thing with it.
238 */
239 PT_REGS_SP(regs) = (unsigned long) frame;
241 err |= __put_user(restorer, &frame->pretcode);
242 err |= __put_user(sig, &frame->sig);
243 err |= copy_sc_to_user(&frame->sc, NULL, regs, save_sp);
244 err |= __put_user(mask->sig[0], &frame->sc.oldmask);
245 if (_NSIG_WORDS > 1)
246 err |= __copy_to_user(&frame->extramask, &mask->sig[1],
247 sizeof(frame->extramask));
249 /*
250 * This is popl %eax ; movl $,%eax ; int $0x80
251 *
252 * WE DO NOT USE IT ANY MORE! It's only left here for historical
253 * reasons and because gdb uses it as a signature to notice
254 * signal handler stack frames.
255 */
256 err |= __put_user(0xb858, (short __user *)(frame->retcode+0));
257 err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2));
258 err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
260 if(err)
261 goto err;
263 PT_REGS_SP(regs) = (unsigned long) frame;
264 PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
265 PT_REGS_EAX(regs) = (unsigned long) sig;
266 PT_REGS_EDX(regs) = (unsigned long) 0;
267 PT_REGS_ECX(regs) = (unsigned long) 0;
269 if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
270 ptrace_notify(SIGTRAP);
271 return 0;
273 err:
274 PT_REGS_SP(regs) = save_sp;
275 return err;
276 }
278 int setup_signal_stack_si(unsigned long stack_top, int sig,
279 struct k_sigaction *ka, struct pt_regs *regs,
280 siginfo_t *info, sigset_t *mask)
281 {
282 struct rt_sigframe __user *frame;
283 void __user *restorer;
284 unsigned long save_sp = PT_REGS_SP(regs);
285 int err = 0;
287 stack_top &= -8UL;
288 frame = (struct rt_sigframe __user *) stack_top - 1;
289 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
290 return 1;
292 restorer = frame->retcode;
293 if(ka->sa.sa_flags & SA_RESTORER)
294 restorer = ka->sa.sa_restorer;
296 /* See comment above about why this is here */
297 PT_REGS_SP(regs) = (unsigned long) frame;
299 err |= __put_user(restorer, &frame->pretcode);
300 err |= __put_user(sig, &frame->sig);
301 err |= __put_user(&frame->info, &frame->pinfo);
302 err |= __put_user(&frame->uc, &frame->puc);
303 err |= copy_siginfo_to_user(&frame->info, info);
304 err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask,
305 save_sp);
307 /*
308 * This is movl $,%eax ; int $0x80
309 *
310 * WE DO NOT USE IT ANY MORE! It's only left here for historical
311 * reasons and because gdb uses it as a signature to notice
312 * signal handler stack frames.
313 */
314 err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
315 err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1));
316 err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
318 if(err)
319 goto err;
321 PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
322 PT_REGS_EAX(regs) = (unsigned long) sig;
323 PT_REGS_EDX(regs) = (unsigned long) &frame->info;
324 PT_REGS_ECX(regs) = (unsigned long) &frame->uc;
326 if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
327 ptrace_notify(SIGTRAP);
328 return 0;
330 err:
331 PT_REGS_SP(regs) = save_sp;
332 return err;
333 }
335 long sys_sigreturn(struct pt_regs regs)
336 {
337 unsigned long sp = PT_REGS_SP(&current->thread.regs);
338 struct sigframe __user *frame = (struct sigframe __user *)(sp - 8);
339 sigset_t set;
340 struct sigcontext __user *sc = &frame->sc;
341 unsigned long __user *oldmask = &sc->oldmask;
342 unsigned long __user *extramask = frame->extramask;
343 int sig_size = (_NSIG_WORDS - 1) * sizeof(unsigned long);
345 if(copy_from_user(&set.sig[0], oldmask, sizeof(set.sig[0])) ||
346 copy_from_user(&set.sig[1], extramask, sig_size))
347 goto segfault;
349 sigdelsetmask(&set, ~_BLOCKABLE);
351 spin_lock_irq(&current->sighand->siglock);
352 current->blocked = set;
353 recalc_sigpending();
354 spin_unlock_irq(&current->sighand->siglock);
356 if(copy_sc_from_user(&current->thread.regs, sc))
357 goto segfault;
359 /* Avoid ERESTART handling */
360 PT_REGS_SYSCALL_NR(&current->thread.regs) = -1;
361 return(PT_REGS_SYSCALL_RET(&current->thread.regs));
363 segfault:
364 force_sig(SIGSEGV, current);
365 return 0;
366 }
368 long sys_rt_sigreturn(struct pt_regs regs)
369 {
370 unsigned long sp = PT_REGS_SP(&current->thread.regs);
371 struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (sp - 4);
372 sigset_t set;
373 struct ucontext __user *uc = &frame->uc;
374 int sig_size = _NSIG_WORDS * sizeof(unsigned long);
376 if(copy_from_user(&set, &uc->uc_sigmask, sig_size))
377 goto segfault;
379 sigdelsetmask(&set, ~_BLOCKABLE);
381 spin_lock_irq(&current->sighand->siglock);
382 current->blocked = set;
383 recalc_sigpending();
384 spin_unlock_irq(&current->sighand->siglock);
386 if(copy_sc_from_user(&current->thread.regs, &uc->uc_mcontext))
387 goto segfault;
389 /* Avoid ERESTART handling */
390 PT_REGS_SYSCALL_NR(&current->thread.regs) = -1;
391 return(PT_REGS_SYSCALL_RET(&current->thread.regs));
393 segfault:
394 force_sig(SIGSEGV, current);
395 return 0;
396 }
398 /*
399 * Overrides for Emacs so that we follow Linus's tabbing style.
400 * Emacs will notice this stuff at the end of the file and automatically
401 * adjust the settings for this buffer only. This must remain at the end
402 * of the file.
403 * ---------------------------------------------------------------------------
404 * Local variables:
405 * c-file-style: "linux"
406 * End:
407 */