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 "signal_user.h"
14 #include "ptrace_user.h"
15 #include "sigcontext.h"
18 #ifdef CONFIG_MODE_SKAS
22 static int copy_sc_from_user_skas(struct pt_regs *regs,
23 struct sigcontext *from)
26 unsigned long fpregs[HOST_FP_SIZE];
29 err = copy_from_user(&sc, from, sizeof(sc));
30 err |= copy_from_user(fpregs, sc.fpstate, sizeof(fpregs));
34 REGS_GS(regs->regs.skas.regs) = sc.gs;
35 REGS_FS(regs->regs.skas.regs) = sc.fs;
36 REGS_ES(regs->regs.skas.regs) = sc.es;
37 REGS_DS(regs->regs.skas.regs) = sc.ds;
38 REGS_EDI(regs->regs.skas.regs) = sc.edi;
39 REGS_ESI(regs->regs.skas.regs) = sc.esi;
40 REGS_EBP(regs->regs.skas.regs) = sc.ebp;
41 REGS_SP(regs->regs.skas.regs) = sc.esp;
42 REGS_EBX(regs->regs.skas.regs) = sc.ebx;
43 REGS_EDX(regs->regs.skas.regs) = sc.edx;
44 REGS_ECX(regs->regs.skas.regs) = sc.ecx;
45 REGS_EAX(regs->regs.skas.regs) = sc.eax;
46 REGS_IP(regs->regs.skas.regs) = sc.eip;
47 REGS_CS(regs->regs.skas.regs) = sc.cs;
48 REGS_EFLAGS(regs->regs.skas.regs) = sc.eflags;
49 REGS_SS(regs->regs.skas.regs) = sc.ss;
50 regs->regs.skas.fault_addr = sc.cr2;
51 regs->regs.skas.fault_type = FAULT_WRITE(sc.err);
52 regs->regs.skas.trap_type = sc.trapno;
54 err = ptrace_setfpregs(userspace_pid[0], fpregs);
56 printk("copy_sc_from_user_skas - PTRACE_SETFPREGS failed, "
64 int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp,
65 struct pt_regs *regs, unsigned long fault_addr,
69 unsigned long fpregs[HOST_FP_SIZE];
72 sc.gs = REGS_GS(regs->regs.skas.regs);
73 sc.fs = REGS_FS(regs->regs.skas.regs);
74 sc.es = REGS_ES(regs->regs.skas.regs);
75 sc.ds = REGS_DS(regs->regs.skas.regs);
76 sc.edi = REGS_EDI(regs->regs.skas.regs);
77 sc.esi = REGS_ESI(regs->regs.skas.regs);
78 sc.ebp = REGS_EBP(regs->regs.skas.regs);
79 sc.esp = REGS_SP(regs->regs.skas.regs);
80 sc.ebx = REGS_EBX(regs->regs.skas.regs);
81 sc.edx = REGS_EDX(regs->regs.skas.regs);
82 sc.ecx = REGS_ECX(regs->regs.skas.regs);
83 sc.eax = REGS_EAX(regs->regs.skas.regs);
84 sc.eip = REGS_IP(regs->regs.skas.regs);
85 sc.cs = REGS_CS(regs->regs.skas.regs);
86 sc.eflags = REGS_EFLAGS(regs->regs.skas.regs);
87 sc.esp_at_signal = regs->regs.skas.regs[UESP];
88 sc.ss = regs->regs.skas.regs[SS];
90 sc.err = TO_SC_ERR(fault_type);
91 sc.trapno = regs->regs.skas.trap_type;
93 err = ptrace_getfpregs(userspace_pid[0], fpregs);
95 printk("copy_sc_to_user_skas - PTRACE_GETFPREGS failed, "
99 to_fp = (to_fp ? to_fp : (struct _fpstate *) (to + 1));
105 return(copy_to_user(to, &sc, sizeof(sc)) ||
106 copy_to_user(to_fp, fpregs, sizeof(fpregs)));
110 #ifdef CONFIG_MODE_TT
111 int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext *from,
114 struct _fpstate *to_fp, *from_fp;
119 from_fp = from->fpstate;
121 err = copy_from_user(to, from, sizeof(*to));
124 err |= copy_from_user(&to->fpstate, &to_fp,
125 sizeof(to->fpstate));
126 err |= copy_from_user(to_fp, from_fp, fpsize);
131 int copy_sc_to_user_tt(struct sigcontext *to, struct _fpstate *fp,
132 struct sigcontext *from, int fpsize)
134 struct _fpstate *to_fp, *from_fp;
137 to_fp = (fp ? fp : (struct _fpstate *) (to + 1));
138 from_fp = from->fpstate;
139 err = copy_to_user(to, from, sizeof(*to));
141 err |= copy_to_user(&to->fpstate, &to_fp,
142 sizeof(to->fpstate));
143 err |= copy_to_user(to_fp, from_fp, fpsize);
149 static int copy_sc_from_user(struct pt_regs *to, void __user *from)
153 ret = CHOOSE_MODE(copy_sc_from_user_tt(UPT_SC(&to->regs), from,
154 sizeof(struct _fpstate)),
155 copy_sc_from_user_skas(to, from));
159 static int copy_sc_to_user(struct sigcontext *to, struct _fpstate *fp,
160 struct pt_regs *from)
162 return(CHOOSE_MODE(copy_sc_to_user_tt(to, fp, UPT_SC(&from->regs),
164 copy_sc_to_user_skas(to, fp, from,
166 current->thread.err)));
169 static int copy_ucontext_to_user(struct ucontext *uc, struct _fpstate *fp,
170 sigset_t *set, unsigned long sp)
174 err |= put_user(current->sas_ss_sp, &uc->uc_stack.ss_sp);
175 err |= put_user(sas_ss_flags(sp), &uc->uc_stack.ss_flags);
176 err |= put_user(current->sas_ss_size, &uc->uc_stack.ss_size);
177 err |= copy_sc_to_user(&uc->uc_mcontext, fp, ¤t->thread.regs);
178 err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set));
186 struct sigcontext sc;
187 struct _fpstate fpstate;
188 unsigned long extramask[_NSIG_WORDS-1];
196 struct siginfo *pinfo;
200 struct _fpstate fpstate;
204 int setup_signal_stack_sc(unsigned long stack_top, int sig,
205 struct k_sigaction *ka, struct pt_regs *regs,
208 struct sigframe __user *frame;
213 frame = (struct sigframe *) stack_top - 1;
214 if(verify_area(VERIFY_WRITE, frame, sizeof(*frame)))
217 restorer = (void *) frame->retcode;
218 if(ka->sa.sa_flags & SA_RESTORER)
219 restorer = ka->sa.sa_restorer;
221 err |= __put_user(restorer, &frame->pretcode);
222 err |= __put_user(sig, &frame->sig);
223 err |= copy_sc_to_user(&frame->sc, NULL, regs);
224 err |= __put_user(mask->sig[0], &frame->sc.oldmask);
226 err |= __copy_to_user(&frame->extramask, &mask->sig[1],
227 sizeof(frame->extramask));
230 * This is popl %eax ; movl $,%eax ; int $0x80
232 * WE DO NOT USE IT ANY MORE! It's only left here for historical
233 * reasons and because gdb uses it as a signature to notice
234 * signal handler stack frames.
236 err |= __put_user(0xb858, (short __user *)(frame->retcode+0));
237 err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2));
238 err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
243 PT_REGS_SP(regs) = (unsigned long) frame;
244 PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
245 PT_REGS_EAX(regs) = (unsigned long) sig;
246 PT_REGS_EDX(regs) = (unsigned long) 0;
247 PT_REGS_ECX(regs) = (unsigned long) 0;
249 if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
250 ptrace_notify(SIGTRAP);
254 int setup_signal_stack_si(unsigned long stack_top, int sig,
255 struct k_sigaction *ka, struct pt_regs *regs,
256 siginfo_t *info, sigset_t *mask)
258 struct rt_sigframe __user *frame;
263 frame = (struct rt_sigframe *) stack_top - 1;
264 if(verify_area(VERIFY_WRITE, frame, sizeof(*frame)))
267 restorer = (void *) frame->retcode;
268 if(ka->sa.sa_flags & SA_RESTORER)
269 restorer = ka->sa.sa_restorer;
271 err |= __put_user(restorer, &frame->pretcode);
272 err |= __put_user(sig, &frame->sig);
273 err |= __put_user(&frame->info, &frame->pinfo);
274 err |= __put_user(&frame->uc, &frame->puc);
275 err |= copy_siginfo_to_user(&frame->info, info);
276 err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask,
280 * This is movl $,%eax ; int $0x80
282 * WE DO NOT USE IT ANY MORE! It's only left here for historical
283 * reasons and because gdb uses it as a signature to notice
284 * signal handler stack frames.
286 err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
287 err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1));
288 err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
293 PT_REGS_SP(regs) = (unsigned long) frame;
294 PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
295 PT_REGS_EAX(regs) = (unsigned long) sig;
296 PT_REGS_EDX(regs) = (unsigned long) &frame->info;
297 PT_REGS_ECX(regs) = (unsigned long) &frame->uc;
299 if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
300 ptrace_notify(SIGTRAP);
304 long sys_sigreturn(struct pt_regs regs)
306 unsigned long __user sp = PT_REGS_SP(¤t->thread.regs);
307 struct sigframe __user *frame = (struct sigframe *)(sp - 8);
309 struct sigcontext __user *sc = &frame->sc;
310 unsigned long __user *oldmask = &sc->oldmask;
311 unsigned long __user *extramask = frame->extramask;
312 int sig_size = (_NSIG_WORDS - 1) * sizeof(unsigned long);
314 if(copy_from_user(&set.sig[0], oldmask, sizeof(&set.sig[0])) ||
315 copy_from_user(&set.sig[1], extramask, sig_size))
318 sigdelsetmask(&set, ~_BLOCKABLE);
320 spin_lock_irq(¤t->sighand->siglock);
321 current->blocked = set;
323 spin_unlock_irq(¤t->sighand->siglock);
325 if(copy_sc_from_user(¤t->thread.regs, sc))
328 /* Avoid ERESTART handling */
329 PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1;
330 return(PT_REGS_SYSCALL_RET(¤t->thread.regs));
333 force_sig(SIGSEGV, current);
337 long sys_rt_sigreturn(struct pt_regs regs)
339 unsigned long __user sp = PT_REGS_SP(¤t->thread.regs);
340 struct rt_sigframe __user *frame = (struct rt_sigframe *) (sp - 4);
342 struct ucontext __user *uc = &frame->uc;
343 int sig_size = _NSIG_WORDS * sizeof(unsigned long);
345 if(copy_from_user(&set, &uc->uc_sigmask, sig_size))
348 sigdelsetmask(&set, ~_BLOCKABLE);
350 spin_lock_irq(¤t->sighand->siglock);
351 current->blocked = set;
353 spin_unlock_irq(¤t->sighand->siglock);
355 if(copy_sc_from_user(¤t->thread.regs, &uc->uc_mcontext))
358 /* Avoid ERESTART handling */
359 PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1;
360 return(PT_REGS_SYSCALL_RET(¤t->thread.regs));
363 force_sig(SIGSEGV, current);
368 * Overrides for Emacs so that we follow Linus's tabbing style.
369 * Emacs will notice this stuff at the end of the file and automatically
370 * adjust the settings for this buffer only. This must remain at the end
372 * ---------------------------------------------------------------------------
374 * c-file-style: "linux"