2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 * Copyright (C) 1994 - 2000, 2006 Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
10 #include <linux/cache.h>
11 #include <linux/compat.h>
12 #include <linux/sched.h>
14 #include <linux/smp.h>
15 #include <linux/kernel.h>
16 #include <linux/signal.h>
17 #include <linux/syscalls.h>
18 #include <linux/errno.h>
19 #include <linux/wait.h>
20 #include <linux/ptrace.h>
21 #include <linux/suspend.h>
22 #include <linux/compiler.h>
23 #include <linux/uaccess.h>
27 #include <asm/compat-signal.h>
28 #include <linux/bitops.h>
29 #include <asm/cacheflush.h>
31 #include <asm/ucontext.h>
37 #include "signal-common.h"
40 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
42 #define __NR_O32_restart_syscall 4253
44 /* 32-bit compatibility types */
46 typedef unsigned int __sighandler32_t;
47 typedef void (*vfptr_t)(void);
52 compat_stack_t uc_stack;
53 struct sigcontext32 uc_mcontext;
54 compat_sigset_t uc_sigmask; /* mask last for extensibility */
58 u32 sf_ass[4]; /* argument save space for o32 */
59 u32 sf_pad[2]; /* Was: signal trampoline */
60 struct sigcontext32 sf_sc;
61 compat_sigset_t sf_mask;
64 struct rt_sigframe32 {
65 u32 rs_ass[4]; /* argument save space for o32 */
66 u32 rs_pad[2]; /* Was: signal trampoline */
67 compat_siginfo_t rs_info;
68 struct ucontext32 rs_uc;
71 static int setup_sigcontext32(struct pt_regs *regs,
72 struct sigcontext32 __user *sc)
77 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
79 err |= __put_user(0, &sc->sc_regs[0]);
80 for (i = 1; i < 32; i++)
81 err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
83 err |= __put_user(regs->hi, &sc->sc_mdhi);
84 err |= __put_user(regs->lo, &sc->sc_mdlo);
86 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
87 err |= __put_user(mfhi1(), &sc->sc_hi1);
88 err |= __put_user(mflo1(), &sc->sc_lo1);
89 err |= __put_user(mfhi2(), &sc->sc_hi2);
90 err |= __put_user(mflo2(), &sc->sc_lo2);
91 err |= __put_user(mfhi3(), &sc->sc_hi3);
92 err |= __put_user(mflo3(), &sc->sc_lo3);
96 * Save FPU state to signal context. Signal handler
97 * will "inherit" current FPU state.
99 err |= protected_save_fp_context(sc);
104 static int restore_sigcontext32(struct pt_regs *regs,
105 struct sigcontext32 __user *sc)
111 /* Always make any pending restarted system calls return -EINTR */
112 current->restart_block.fn = do_no_restart_syscall;
114 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
115 err |= __get_user(regs->hi, &sc->sc_mdhi);
116 err |= __get_user(regs->lo, &sc->sc_mdlo);
118 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
119 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
120 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
121 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
122 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
123 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
124 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
127 for (i = 1; i < 32; i++)
128 err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
130 return err ?: protected_restore_fp_context(sc);
134 * Atomically swap in the new signal mask, and wait for a signal.
137 asmlinkage int sys32_sigsuspend(compat_sigset_t __user *uset)
139 return compat_sys_rt_sigsuspend(uset, sizeof(compat_sigset_t));
142 SYSCALL_DEFINE3(32_sigaction, long, sig, const struct compat_sigaction __user *, act,
143 struct compat_sigaction __user *, oact)
145 struct k_sigaction new_ka, old_ka;
153 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
155 err |= __get_user(handler, &act->sa_handler);
156 new_ka.sa.sa_handler = (void __user *)(s64)handler;
157 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
158 err |= __get_user(mask, &act->sa_mask.sig[0]);
162 siginitset(&new_ka.sa.sa_mask, mask);
165 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
168 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
170 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
171 err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
173 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
174 err |= __put_user(0, &oact->sa_mask.sig[1]);
175 err |= __put_user(0, &oact->sa_mask.sig[2]);
176 err |= __put_user(0, &oact->sa_mask.sig[3]);
184 int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from)
188 if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
191 /* If you change siginfo_t structure, please be sure
192 this code is fixed accordingly.
193 It should never copy any pad contained in the structure
194 to avoid security leaks, but must copy the generic
195 3 ints plus the relevant union member.
196 This routine must convert siginfo from 64bit to 32bit as well
198 err = __put_user(from->si_signo, &to->si_signo);
199 err |= __put_user(from->si_errno, &to->si_errno);
200 err |= __put_user((short)from->si_code, &to->si_code);
201 if (from->si_code < 0)
202 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
204 switch (from->si_code >> 16) {
205 case __SI_TIMER >> 16:
206 err |= __put_user(from->si_tid, &to->si_tid);
207 err |= __put_user(from->si_overrun, &to->si_overrun);
208 err |= __put_user(from->si_int, &to->si_int);
210 case __SI_CHLD >> 16:
211 err |= __put_user(from->si_utime, &to->si_utime);
212 err |= __put_user(from->si_stime, &to->si_stime);
213 err |= __put_user(from->si_status, &to->si_status);
215 err |= __put_user(from->si_pid, &to->si_pid);
216 err |= __put_user(from->si_uid, &to->si_uid);
218 case __SI_FAULT >> 16:
219 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
221 case __SI_POLL >> 16:
222 err |= __put_user(from->si_band, &to->si_band);
223 err |= __put_user(from->si_fd, &to->si_fd);
225 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
226 case __SI_MESGQ >> 16:
227 err |= __put_user(from->si_pid, &to->si_pid);
228 err |= __put_user(from->si_uid, &to->si_uid);
229 err |= __put_user(from->si_int, &to->si_int);
236 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
238 if (copy_from_user(to, from, 3*sizeof(int)) ||
239 copy_from_user(to->_sifields._pad,
240 from->_sifields._pad, SI_PAD_SIZE32))
246 asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
248 struct sigframe32 __user *frame;
252 frame = (struct sigframe32 __user *) regs.regs[29];
253 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
255 if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))
258 set_current_blocked(&blocked);
260 sig = restore_sigcontext32(®s, &frame->sf_sc);
264 force_sig(sig, current);
267 * Don't let your children do this ...
269 __asm__ __volatile__(
277 force_sig(SIGSEGV, current);
280 asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
282 struct rt_sigframe32 __user *frame;
286 frame = (struct rt_sigframe32 __user *) regs.regs[29];
287 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
289 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
292 set_current_blocked(&set);
294 sig = restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext);
298 force_sig(sig, current);
300 if (compat_restore_altstack(&frame->rs_uc.uc_stack))
304 * Don't let your children do this ...
306 __asm__ __volatile__(
314 force_sig(SIGSEGV, current);
317 static int setup_frame_32(void *sig_return, struct ksignal *ksig,
318 struct pt_regs *regs, sigset_t *set)
320 struct sigframe32 __user *frame;
323 frame = get_sigframe(ksig, regs, sizeof(*frame));
324 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
327 err |= setup_sigcontext32(regs, &frame->sf_sc);
328 err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);
334 * Arguments to signal handler:
337 * a1 = 0 (should be cause)
338 * a2 = pointer to struct sigcontext
340 * $25 and c0_epc point to the signal handler, $29 points to the
343 regs->regs[ 4] = ksig->sig;
345 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
346 regs->regs[29] = (unsigned long) frame;
347 regs->regs[31] = (unsigned long) sig_return;
348 regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
350 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
351 current->comm, current->pid,
352 frame, regs->cp0_epc, regs->regs[31]);
357 static int setup_rt_frame_32(void *sig_return, struct ksignal *ksig,
358 struct pt_regs *regs, sigset_t *set)
360 struct rt_sigframe32 __user *frame;
363 frame = get_sigframe(ksig, regs, sizeof(*frame));
364 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
367 /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
368 err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
370 /* Create the ucontext. */
371 err |= __put_user(0, &frame->rs_uc.uc_flags);
372 err |= __put_user(0, &frame->rs_uc.uc_link);
373 err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
374 err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
375 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
381 * Arguments to signal handler:
384 * a1 = 0 (should be cause)
385 * a2 = pointer to ucontext
387 * $25 and c0_epc point to the signal handler, $29 points to
388 * the struct rt_sigframe32.
390 regs->regs[ 4] = ksig->sig;
391 regs->regs[ 5] = (unsigned long) &frame->rs_info;
392 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
393 regs->regs[29] = (unsigned long) frame;
394 regs->regs[31] = (unsigned long) sig_return;
395 regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
397 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
398 current->comm, current->pid,
399 frame, regs->cp0_epc, regs->regs[31]);
405 * o32 compatibility on 64-bit kernels, without DSP ASE
407 struct mips_abi mips_abi_32 = {
408 .setup_frame = setup_frame_32,
409 .signal_return_offset =
410 offsetof(struct mips_vdso, o32_signal_trampoline),
411 .setup_rt_frame = setup_rt_frame_32,
412 .rt_signal_return_offset =
413 offsetof(struct mips_vdso, o32_rt_signal_trampoline),
414 .restart = __NR_O32_restart_syscall,
416 .off_sc_fpregs = offsetof(struct sigcontext32, sc_fpregs),
417 .off_sc_fpc_csr = offsetof(struct sigcontext32, sc_fpc_csr),
418 .off_sc_used_math = offsetof(struct sigcontext32, sc_used_math),