2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
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, version 2.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
15 #include <linux/sched.h>
17 #include <linux/smp.h>
18 #include <linux/smp_lock.h>
19 #include <linux/kernel.h>
20 #include <linux/signal.h>
21 #include <linux/errno.h>
22 #include <linux/wait.h>
23 #include <linux/unistd.h>
24 #include <linux/stddef.h>
25 #include <linux/personality.h>
26 #include <linux/suspend.h>
27 #include <linux/ptrace.h>
28 #include <linux/elf.h>
29 #include <linux/compat.h>
30 #include <linux/syscalls.h>
31 #include <linux/uaccess.h>
32 #include <asm/processor.h>
33 #include <asm/ucontext.h>
34 #include <asm/sigframe.h>
35 #include <asm/syscalls.h>
36 #include <arch/interrupts.h>
38 struct compat_sigaction {
39 compat_uptr_t sa_handler;
40 compat_ulong_t sa_flags;
41 compat_uptr_t sa_restorer;
42 sigset_t sa_mask __packed;
45 struct compat_sigaltstack {
48 compat_size_t ss_size;
51 struct compat_ucontext {
52 compat_ulong_t uc_flags;
53 compat_uptr_t uc_link;
54 struct compat_sigaltstack uc_stack;
55 struct sigcontext uc_mcontext;
56 sigset_t uc_sigmask; /* mask last for extensibility */
59 struct compat_siginfo {
65 int _pad[SI_PAD_SIZE];
69 unsigned int _pid; /* sender's pid */
70 unsigned int _uid; /* sender's uid */
75 compat_timer_t _tid; /* timer id */
76 int _overrun; /* overrun count */
77 compat_sigval_t _sigval; /* same as below */
78 int _sys_private; /* not to be passed to user */
79 int _overrun_incr; /* amount to add to overrun */
82 /* POSIX.1b signals */
84 unsigned int _pid; /* sender's pid */
85 unsigned int _uid; /* sender's uid */
86 compat_sigval_t _sigval;
91 unsigned int _pid; /* which child */
92 unsigned int _uid; /* sender's uid */
93 int _status; /* exit code */
94 compat_clock_t _utime;
95 compat_clock_t _stime;
98 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
100 unsigned int _addr; /* faulting insn/memory ref. */
101 #ifdef __ARCH_SI_TRAPNO
102 int _trapno; /* TRAP # which caused the signal */
108 int _band; /* POLL_IN, POLL_OUT, POLL_MSG */
114 struct compat_rt_sigframe {
115 unsigned char save_area[C_ABI_SAVE_AREA_SIZE]; /* caller save area */
116 struct compat_siginfo info;
117 struct compat_ucontext uc;
120 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
122 long compat_sys_rt_sigaction(int sig, struct compat_sigaction __user *act,
123 struct compat_sigaction __user *oact,
126 struct k_sigaction new_sa, old_sa;
129 /* XXX: Don't preclude handling different sized sigset_t's. */
130 if (sigsetsize != sizeof(sigset_t))
134 compat_uptr_t handler, restorer;
136 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
137 __get_user(handler, &act->sa_handler) ||
138 __get_user(new_sa.sa.sa_flags, &act->sa_flags) ||
139 __get_user(restorer, &act->sa_restorer) ||
140 __copy_from_user(&new_sa.sa.sa_mask, &act->sa_mask,
143 new_sa.sa.sa_handler = compat_ptr(handler);
144 new_sa.sa.sa_restorer = compat_ptr(restorer);
147 ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);
150 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
151 __put_user(ptr_to_compat(old_sa.sa.sa_handler),
152 &oact->sa_handler) ||
153 __put_user(ptr_to_compat(old_sa.sa.sa_restorer),
154 &oact->sa_restorer) ||
155 __put_user(old_sa.sa.sa_flags, &oact->sa_flags) ||
156 __copy_to_user(&oact->sa_mask, &old_sa.sa.sa_mask,
164 long compat_sys_rt_sigqueueinfo(int pid, int sig,
165 struct compat_siginfo __user *uinfo)
169 mm_segment_t old_fs = get_fs();
171 if (copy_siginfo_from_user32(&info, uinfo))
174 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *)&info);
179 int copy_siginfo_to_user32(struct compat_siginfo __user *to, siginfo_t *from)
183 if (!access_ok(VERIFY_WRITE, to, sizeof(struct compat_siginfo)))
186 /* If you change siginfo_t structure, please make sure that
187 this code is fixed accordingly.
188 It should never copy any pad contained in the structure
189 to avoid security leaks, but must copy the generic
190 3 ints plus the relevant union member. */
191 err = __put_user(from->si_signo, &to->si_signo);
192 err |= __put_user(from->si_errno, &to->si_errno);
193 err |= __put_user((short)from->si_code, &to->si_code);
195 if (from->si_code < 0) {
196 err |= __put_user(from->si_pid, &to->si_pid);
197 err |= __put_user(from->si_uid, &to->si_uid);
198 err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr);
201 * First 32bits of unions are always present:
202 * si_pid === si_band === si_tid === si_addr(LS half)
204 err |= __put_user(from->_sifields._pad[0],
205 &to->_sifields._pad[0]);
206 switch (from->si_code >> 16) {
207 case __SI_FAULT >> 16:
209 case __SI_CHLD >> 16:
210 err |= __put_user(from->si_utime, &to->si_utime);
211 err |= __put_user(from->si_stime, &to->si_stime);
212 err |= __put_user(from->si_status, &to->si_status);
215 case __SI_KILL >> 16:
216 err |= __put_user(from->si_uid, &to->si_uid);
218 case __SI_POLL >> 16:
219 err |= __put_user(from->si_fd, &to->si_fd);
221 case __SI_TIMER >> 16:
222 err |= __put_user(from->si_overrun, &to->si_overrun);
223 err |= __put_user(ptr_to_compat(from->si_ptr),
226 /* This is not generated by the kernel as of now. */
228 case __SI_MESGQ >> 16:
229 err |= __put_user(from->si_uid, &to->si_uid);
230 err |= __put_user(from->si_int, &to->si_int);
237 int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
242 if (!access_ok(VERIFY_READ, from, sizeof(struct compat_siginfo)))
245 err = __get_user(to->si_signo, &from->si_signo);
246 err |= __get_user(to->si_errno, &from->si_errno);
247 err |= __get_user(to->si_code, &from->si_code);
249 err |= __get_user(to->si_pid, &from->si_pid);
250 err |= __get_user(to->si_uid, &from->si_uid);
251 err |= __get_user(ptr32, &from->si_ptr);
252 to->si_ptr = compat_ptr(ptr32);
257 long _compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr,
258 struct compat_sigaltstack __user *uoss_ptr,
259 struct pt_regs *regs)
268 memset(&uss, 0, sizeof(stack_t));
269 if (!access_ok(VERIFY_READ, uss_ptr, sizeof(*uss_ptr)) ||
270 __get_user(ptr, &uss_ptr->ss_sp) ||
271 __get_user(uss.ss_flags, &uss_ptr->ss_flags) ||
272 __get_user(uss.ss_size, &uss_ptr->ss_size))
274 uss.ss_sp = compat_ptr(ptr);
278 ret = do_sigaltstack(uss_ptr ? (stack_t __user __force *)&uss : NULL,
279 (stack_t __user __force *)&uoss,
280 (unsigned long)compat_ptr(regs->sp));
282 if (ret >= 0 && uoss_ptr) {
283 if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(*uoss_ptr)) ||
284 __put_user(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp) ||
285 __put_user(uoss.ss_flags, &uoss_ptr->ss_flags) ||
286 __put_user(uoss.ss_size, &uoss_ptr->ss_size))
292 long _compat_sys_rt_sigreturn(struct pt_regs *regs)
294 struct compat_rt_sigframe __user *frame =
295 (struct compat_rt_sigframe __user *) compat_ptr(regs->sp);
299 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
301 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
304 sigdelsetmask(&set, ~_BLOCKABLE);
305 spin_lock_irq(¤t->sighand->siglock);
306 current->blocked = set;
308 spin_unlock_irq(¤t->sighand->siglock);
310 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
313 if (_compat_sys_sigaltstack(&frame->uc.uc_stack, NULL, regs) != 0)
319 force_sig(SIGSEGV, current);
324 * Determine which stack to use..
326 static inline void __user *compat_get_sigframe(struct k_sigaction *ka,
327 struct pt_regs *regs,
332 /* Default to using normal stack */
333 sp = (unsigned long)compat_ptr(regs->sp);
336 * If we are on the alternate signal stack and would overflow
337 * it, don't. Return an always-bogus address instead so we
338 * will die with SIGSEGV.
340 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
341 return (void __user __force *)-1UL;
343 /* This is the X/Open sanctioned signal stack switching. */
344 if (ka->sa.sa_flags & SA_ONSTACK) {
345 if (sas_ss_flags(sp) == 0)
346 sp = current->sas_ss_sp + current->sas_ss_size;
351 * Align the stack pointer according to the TILE ABI,
352 * i.e. so that on function entry (sp & 15) == 0.
355 return (void __user *) sp;
358 int compat_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
359 sigset_t *set, struct pt_regs *regs)
361 unsigned long restorer;
362 struct compat_rt_sigframe __user *frame;
366 frame = compat_get_sigframe(ka, regs, sizeof(*frame));
368 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
371 usig = current_thread_info()->exec_domain
372 && current_thread_info()->exec_domain->signal_invmap
374 ? current_thread_info()->exec_domain->signal_invmap[sig]
377 /* Always write at least the signal number for the stack backtracer. */
378 if (ka->sa.sa_flags & SA_SIGINFO) {
379 /* At sigreturn time, restore the callee-save registers too. */
380 err |= copy_siginfo_to_user32(&frame->info, info);
381 regs->flags |= PT_FLAGS_RESTORE_REGS;
383 err |= __put_user(info->si_signo, &frame->info.si_signo);
386 /* Create the ucontext. */
387 err |= __clear_user(&frame->save_area, sizeof(frame->save_area));
388 err |= __put_user(0, &frame->uc.uc_flags);
389 err |= __put_user(0, &frame->uc.uc_link);
390 err |= __put_user(ptr_to_compat((void *)(current->sas_ss_sp)),
391 &frame->uc.uc_stack.ss_sp);
392 err |= __put_user(sas_ss_flags(regs->sp),
393 &frame->uc.uc_stack.ss_flags);
394 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
395 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs);
396 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
400 restorer = VDSO_BASE;
401 if (ka->sa.sa_flags & SA_RESTORER)
402 restorer = ptr_to_compat_reg(ka->sa.sa_restorer);
405 * Set up registers for signal handler.
406 * Registers that we don't modify keep the value they had from
407 * user-space at the time we took the signal.
409 regs->pc = ptr_to_compat_reg(ka->sa.sa_handler);
410 regs->ex1 = PL_ICS_EX1(USER_PL, 1); /* set crit sec in handler */
411 regs->sp = ptr_to_compat_reg(frame);
413 regs->regs[0] = (unsigned long) usig;
415 if (ka->sa.sa_flags & SA_SIGINFO) {
416 /* Need extra arguments, so mark to restore caller-saves. */
417 regs->regs[1] = ptr_to_compat_reg(&frame->info);
418 regs->regs[2] = ptr_to_compat_reg(&frame->uc);
419 regs->flags |= PT_FLAGS_CALLER_SAVES;
423 * Notify any tracer that was single-stepping it.
424 * The tracer may want to single-step inside the
427 if (test_thread_flag(TIF_SINGLESTEP))
428 ptrace_notify(SIGTRAP);
433 force_sigsegv(sig, current);