2 * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
3 * Licensed under the GPL
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"
17 #ifdef CONFIG_MODE_SKAS
21 static int copy_sc_from_user_skas(struct pt_regs *regs,
22 struct sigcontext *from)
25 unsigned long fpregs[HOST_FP_SIZE];
28 err = copy_from_user(&sc, from, sizeof(sc));
29 err |= copy_from_user(fpregs, sc.fpstate, sizeof(fpregs));
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);
52 printk("copy_sc_from_user_skas - PTRACE_SETFPREGS failed, "
60 int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp,
61 struct pt_regs *regs, unsigned long sp)
64 unsigned long fpregs[HOST_FP_SIZE];
65 struct faultinfo * fi = ¤t->thread.arch.faultinfo;
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);
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];
86 sc.err = fi->error_code;
87 sc.trapno = fi->trap_no;
89 err = save_fp_registers(userspace_pid[0], fpregs);
91 printk("copy_sc_to_user_skas - PTRACE_GETFPREGS failed, "
95 to_fp = (to_fp ? to_fp : (struct _fpstate *) (to + 1));
101 return(copy_to_user(to, &sc, sizeof(sc)) ||
102 copy_to_user(to_fp, fpregs, sizeof(fpregs)));
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
116 int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext *from,
119 struct _fpstate *to_fp, *from_fp;
125 err = copy_from_user(to, from, sizeof(*to));
126 from_fp = to->fpstate;
130 err |= copy_from_user(to_fp, from_fp, fpsize);
134 int copy_sc_to_user_tt(struct sigcontext *to, struct _fpstate *fp,
135 struct sigcontext *from, int fpsize, unsigned long sp)
137 struct _fpstate *to_fp, *from_fp;
140 to_fp = (fp ? fp : (struct _fpstate *) (to + 1));
141 from_fp = from->fpstate;
142 err = copy_to_user(to, from, sizeof(*to));
144 /* The SP in the sigcontext is the updated one for the signal
145 * delivery. The sp passed in is the original, and this needs
146 * to be restored, so we stick it in separately.
148 err |= copy_to_user(&SC_SP(to), sp, sizeof(sp));
151 err |= copy_to_user(&to->fpstate, &to_fp, sizeof(to->fpstate));
152 err |= copy_to_user(to_fp, from_fp, fpsize);
158 static int copy_sc_from_user(struct pt_regs *to, void __user *from)
162 ret = CHOOSE_MODE(copy_sc_from_user_tt(UPT_SC(&to->regs), from,
163 sizeof(struct _fpstate)),
164 copy_sc_from_user_skas(to, from));
168 static int copy_sc_to_user(struct sigcontext *to, struct _fpstate *fp,
169 struct pt_regs *from, unsigned long sp)
171 return(CHOOSE_MODE(copy_sc_to_user_tt(to, fp, UPT_SC(&from->regs),
173 copy_sc_to_user_skas(to, fp, from, sp)));
176 static int copy_ucontext_to_user(struct ucontext *uc, struct _fpstate *fp,
177 sigset_t *set, unsigned long sp)
181 err |= put_user(current->sas_ss_sp, &uc->uc_stack.ss_sp);
182 err |= put_user(sas_ss_flags(sp), &uc->uc_stack.ss_flags);
183 err |= put_user(current->sas_ss_size, &uc->uc_stack.ss_size);
184 err |= copy_sc_to_user(&uc->uc_mcontext, fp, ¤t->thread.regs, sp);
185 err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set));
193 struct sigcontext sc;
194 struct _fpstate fpstate;
195 unsigned long extramask[_NSIG_WORDS-1];
203 struct siginfo *pinfo;
207 struct _fpstate fpstate;
211 int setup_signal_stack_sc(unsigned long stack_top, int sig,
212 struct k_sigaction *ka, struct pt_regs *regs,
215 struct sigframe __user *frame;
217 unsigned long save_sp = PT_REGS_SP(regs);
221 frame = (struct sigframe *) stack_top - 1;
222 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
225 restorer = (void *) frame->retcode;
226 if(ka->sa.sa_flags & SA_RESTORER)
227 restorer = ka->sa.sa_restorer;
229 /* Update SP now because the page fault handler refuses to extend
230 * the stack if the faulting address is too far below the current
231 * SP, which frame now certainly is. If there's an error, the original
232 * value is restored on the way out.
233 * When writing the sigcontext to the stack, we have to write the
234 * original value, so that's passed to copy_sc_to_user, which does
235 * the right thing with it.
237 PT_REGS_SP(regs) = (unsigned long) frame;
239 err |= __put_user(restorer, &frame->pretcode);
240 err |= __put_user(sig, &frame->sig);
241 err |= copy_sc_to_user(&frame->sc, NULL, regs, save_sp);
242 err |= __put_user(mask->sig[0], &frame->sc.oldmask);
244 err |= __copy_to_user(&frame->extramask, &mask->sig[1],
245 sizeof(frame->extramask));
248 * This is popl %eax ; movl $,%eax ; int $0x80
250 * WE DO NOT USE IT ANY MORE! It's only left here for historical
251 * reasons and because gdb uses it as a signature to notice
252 * signal handler stack frames.
254 err |= __put_user(0xb858, (short __user *)(frame->retcode+0));
255 err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2));
256 err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
261 PT_REGS_SP(regs) = (unsigned long) frame;
262 PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
263 PT_REGS_EAX(regs) = (unsigned long) sig;
264 PT_REGS_EDX(regs) = (unsigned long) 0;
265 PT_REGS_ECX(regs) = (unsigned long) 0;
267 if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
268 ptrace_notify(SIGTRAP);
272 PT_REGS_SP(regs) = save_sp;
276 int setup_signal_stack_si(unsigned long stack_top, int sig,
277 struct k_sigaction *ka, struct pt_regs *regs,
278 siginfo_t *info, sigset_t *mask)
280 struct rt_sigframe __user *frame;
282 unsigned long save_sp = PT_REGS_SP(regs);
286 frame = (struct rt_sigframe *) stack_top - 1;
287 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
290 restorer = (void *) frame->retcode;
291 if(ka->sa.sa_flags & SA_RESTORER)
292 restorer = ka->sa.sa_restorer;
294 /* See comment above about why this is here */
295 PT_REGS_SP(regs) = (unsigned long) frame;
297 err |= __put_user(restorer, &frame->pretcode);
298 err |= __put_user(sig, &frame->sig);
299 err |= __put_user(&frame->info, &frame->pinfo);
300 err |= __put_user(&frame->uc, &frame->puc);
301 err |= copy_siginfo_to_user(&frame->info, info);
302 err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask,
306 * This is movl $,%eax ; int $0x80
308 * WE DO NOT USE IT ANY MORE! It's only left here for historical
309 * reasons and because gdb uses it as a signature to notice
310 * signal handler stack frames.
312 err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
313 err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1));
314 err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
319 PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
320 PT_REGS_EAX(regs) = (unsigned long) sig;
321 PT_REGS_EDX(regs) = (unsigned long) &frame->info;
322 PT_REGS_ECX(regs) = (unsigned long) &frame->uc;
324 if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
325 ptrace_notify(SIGTRAP);
329 PT_REGS_SP(regs) = save_sp;
333 long sys_sigreturn(struct pt_regs regs)
335 unsigned long sp = PT_REGS_SP(¤t->thread.regs);
336 struct sigframe __user *frame = (struct sigframe *)(sp - 8);
338 struct sigcontext __user *sc = &frame->sc;
339 unsigned long __user *oldmask = &sc->oldmask;
340 unsigned long __user *extramask = frame->extramask;
341 int sig_size = (_NSIG_WORDS - 1) * sizeof(unsigned long);
343 if(copy_from_user(&set.sig[0], oldmask, sizeof(set.sig[0])) ||
344 copy_from_user(&set.sig[1], extramask, sig_size))
347 sigdelsetmask(&set, ~_BLOCKABLE);
349 spin_lock_irq(¤t->sighand->siglock);
350 current->blocked = set;
352 spin_unlock_irq(¤t->sighand->siglock);
354 if(copy_sc_from_user(¤t->thread.regs, sc))
357 /* Avoid ERESTART handling */
358 PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1;
359 return(PT_REGS_SYSCALL_RET(¤t->thread.regs));
362 force_sig(SIGSEGV, current);
366 long sys_rt_sigreturn(struct pt_regs regs)
368 unsigned long __user sp = PT_REGS_SP(¤t->thread.regs);
369 struct rt_sigframe __user *frame = (struct rt_sigframe *) (sp - 4);
371 struct ucontext __user *uc = &frame->uc;
372 int sig_size = _NSIG_WORDS * sizeof(unsigned long);
374 if(copy_from_user(&set, &uc->uc_sigmask, sig_size))
377 sigdelsetmask(&set, ~_BLOCKABLE);
379 spin_lock_irq(¤t->sighand->siglock);
380 current->blocked = set;
382 spin_unlock_irq(¤t->sighand->siglock);
384 if(copy_sc_from_user(¤t->thread.regs, &uc->uc_mcontext))
387 /* Avoid ERESTART handling */
388 PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1;
389 return(PT_REGS_SYSCALL_RET(¤t->thread.regs));
392 force_sig(SIGSEGV, current);
397 * Overrides for Emacs so that we follow Linus's tabbing style.
398 * Emacs will notice this stuff at the end of the file and automatically
399 * adjust the settings for this buffer only. This must remain at the end
401 * ---------------------------------------------------------------------------
403 * c-file-style: "linux"