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-rw-r--r--arch/sh64/kernel/signal.c750
1 files changed, 0 insertions, 750 deletions
diff --git a/arch/sh64/kernel/signal.c b/arch/sh64/kernel/signal.c
deleted file mode 100644
index 79fc48cf54c..00000000000
--- a/arch/sh64/kernel/signal.c
+++ /dev/null
@@ -1,750 +0,0 @@
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * arch/sh64/kernel/signal.c
- *
- * Copyright (C) 2000, 2001 Paolo Alberelli
- * Copyright (C) 2003 Paul Mundt
- * Copyright (C) 2004 Richard Curnow
- *
- * Started from sh version.
- *
- */
-#include <linux/rwsem.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/kernel.h>
-#include <linux/signal.h>
-#include <linux/errno.h>
-#include <linux/wait.h>
-#include <linux/personality.h>
-#include <linux/freezer.h>
-#include <linux/ptrace.h>
-#include <linux/unistd.h>
-#include <linux/stddef.h>
-#include <asm/ucontext.h>
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
-
-
-#define REG_RET 9
-#define REG_ARG1 2
-#define REG_ARG2 3
-#define REG_ARG3 4
-#define REG_SP 15
-#define REG_PR 18
-#define REF_REG_RET regs->regs[REG_RET]
-#define REF_REG_SP regs->regs[REG_SP]
-#define DEREF_REG_PR regs->regs[REG_PR]
-
-#define DEBUG_SIG 0
-
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
-asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
-
-/*
- * Atomically swap in the new signal mask, and wait for a signal.
- */
-
-asmlinkage int
-sys_sigsuspend(old_sigset_t mask,
- unsigned long r3, unsigned long r4, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs * regs)
-{
- sigset_t saveset;
-
- mask &= _BLOCKABLE;
- spin_lock_irq(&current->sighand->siglock);
- saveset = current->blocked;
- siginitset(&current->blocked, mask);
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
-
- REF_REG_RET = -EINTR;
- while (1) {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- regs->pc += 4; /* because sys_sigreturn decrements the pc */
- if (do_signal(regs, &saveset)) {
- /* pc now points at signal handler. Need to decrement
- it because entry.S will increment it. */
- regs->pc -= 4;
- return -EINTR;
- }
- }
-}
-
-asmlinkage int
-sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
- unsigned long r4, unsigned long r5, unsigned long r6,
- unsigned long r7,
- struct pt_regs * regs)
-{
- sigset_t saveset, newset;
-
- /* XXX: Don't preclude handling different sized sigset_t's. */
- if (sigsetsize != sizeof(sigset_t))
- return -EINVAL;
-
- if (copy_from_user(&newset, unewset, sizeof(newset)))
- return -EFAULT;
- sigdelsetmask(&newset, ~_BLOCKABLE);
- spin_lock_irq(&current->sighand->siglock);
- saveset = current->blocked;
- current->blocked = newset;
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
-
- REF_REG_RET = -EINTR;
- while (1) {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- regs->pc += 4; /* because sys_sigreturn decrements the pc */
- if (do_signal(regs, &saveset)) {
- /* pc now points at signal handler. Need to decrement
- it because entry.S will increment it. */
- regs->pc -= 4;
- return -EINTR;
- }
- }
-}
-
-asmlinkage int
-sys_sigaction(int sig, const struct old_sigaction __user *act,
- struct old_sigaction __user *oact)
-{
- struct k_sigaction new_ka, old_ka;
- int ret;
-
- if (act) {
- old_sigset_t mask;
- if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
- __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
- __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
- return -EFAULT;
- __get_user(new_ka.sa.sa_flags, &act->sa_flags);
- __get_user(mask, &act->sa_mask);
- siginitset(&new_ka.sa.sa_mask, mask);
- }
-
- ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-
- if (!ret && oact) {
- if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
- __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
- __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
- return -EFAULT;
- __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
- __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
- }
-
- return ret;
-}
-
-asmlinkage int
-sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
- unsigned long r4, unsigned long r5, unsigned long r6,
- unsigned long r7,
- struct pt_regs * regs)
-{
- return do_sigaltstack(uss, uoss, REF_REG_SP);
-}
-
-
-/*
- * Do a signal return; undo the signal stack.
- */
-
-struct sigframe
-{
- struct sigcontext sc;
- unsigned long extramask[_NSIG_WORDS-1];
- long long retcode[2];
-};
-
-struct rt_sigframe
-{
- struct siginfo __user *pinfo;
- void *puc;
- struct siginfo info;
- struct ucontext uc;
- long long retcode[2];
-};
-
-#ifdef CONFIG_SH_FPU
-static inline int
-restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
-{
- int err = 0;
- int fpvalid;
-
- err |= __get_user (fpvalid, &sc->sc_fpvalid);
- conditional_used_math(fpvalid);
- if (! fpvalid)
- return err;
-
- if (current == last_task_used_math) {
- last_task_used_math = NULL;
- regs->sr |= SR_FD;
- }
-
- err |= __copy_from_user(&current->thread.fpu.hard, &sc->sc_fpregs[0],
- (sizeof(long long) * 32) + (sizeof(int) * 1));
-
- return err;
-}
-
-static inline int
-setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
-{
- int err = 0;
- int fpvalid;
-
- fpvalid = !!used_math();
- err |= __put_user(fpvalid, &sc->sc_fpvalid);
- if (! fpvalid)
- return err;
-
- if (current == last_task_used_math) {
- grab_fpu();
- fpsave(&current->thread.fpu.hard);
- release_fpu();
- last_task_used_math = NULL;
- regs->sr |= SR_FD;
- }
-
- err |= __copy_to_user(&sc->sc_fpregs[0], &current->thread.fpu.hard,
- (sizeof(long long) * 32) + (sizeof(int) * 1));
- clear_used_math();
-
- return err;
-}
-#else
-static inline int
-restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
-{}
-static inline int
-setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
-{}
-#endif
-
-static int
-restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, long long *r2_p)
-{
- unsigned int err = 0;
- unsigned long long current_sr, new_sr;
-#define SR_MASK 0xffff8cfd
-
-#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
-
- COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]);
- COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]);
- COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]);
- COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]);
- COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]);
- COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]);
- COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]);
- COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]);
- COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]);
- COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]);
- COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]);
- COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]);
- COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]);
- COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]);
- COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]);
- COPY(regs[60]); COPY(regs[61]); COPY(regs[62]);
- COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]);
- COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]);
-
- /* Prevent the signal handler manipulating SR in a way that can
- crash the kernel. i.e. only allow S, Q, M, PR, SZ, FR to be
- modified */
- current_sr = regs->sr;
- err |= __get_user(new_sr, &sc->sc_sr);
- regs->sr &= SR_MASK;
- regs->sr |= (new_sr & ~SR_MASK);
-
- COPY(pc);
-
-#undef COPY
-
- /* Must do this last in case it sets regs->sr.fd (i.e. after rest of sr
- * has been restored above.) */
- err |= restore_sigcontext_fpu(regs, sc);
-
- regs->syscall_nr = -1; /* disable syscall checks */
- err |= __get_user(*r2_p, &sc->sc_regs[REG_RET]);
- return err;
-}
-
-asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3,
- unsigned long r4, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs * regs)
-{
- struct sigframe __user *frame = (struct sigframe __user *) (long) REF_REG_SP;
- sigset_t set;
- long long ret;
-
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
- goto badframe;
-
- if (__get_user(set.sig[0], &frame->sc.oldmask)
- || (_NSIG_WORDS > 1
- && __copy_from_user(&set.sig[1], &frame->extramask,
- sizeof(frame->extramask))))
- goto badframe;
-
- sigdelsetmask(&set, ~_BLOCKABLE);
-
- spin_lock_irq(&current->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
-
- if (restore_sigcontext(regs, &frame->sc, &ret))
- goto badframe;
- regs->pc -= 4;
-
- return (int) ret;
-
-badframe:
- force_sig(SIGSEGV, current);
- return 0;
-}
-
-asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3,
- unsigned long r4, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs * regs)
-{
- struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (long) REF_REG_SP;
- sigset_t set;
- stack_t __user st;
- long long ret;
-
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
- goto badframe;
-
- if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
- goto badframe;
-
- sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(&current->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
-
- if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ret))
- goto badframe;
- regs->pc -= 4;
-
- if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
- goto badframe;
- /* It is more difficult to avoid calling this function than to
- call it and ignore errors. */
- do_sigaltstack(&st, NULL, REF_REG_SP);
-
- return (int) ret;
-
-badframe:
- force_sig(SIGSEGV, current);
- return 0;
-}
-
-/*
- * Set up a signal frame.
- */
-
-static int
-setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
- unsigned long mask)
-{
- int err = 0;
-
- /* Do this first, otherwise is this sets sr->fd, that value isn't preserved. */
- err |= setup_sigcontext_fpu(regs, sc);
-
-#define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
-
- COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]);
- COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]);
- COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]);
- COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]);
- COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]);
- COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]);
- COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]);
- COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]);
- COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]);
- COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]);
- COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]);
- COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]);
- COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]);
- COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]);
- COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]);
- COPY(regs[60]); COPY(regs[61]); COPY(regs[62]);
- COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]);
- COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]);
- COPY(sr); COPY(pc);
-
-#undef COPY
-
- err |= __put_user(mask, &sc->oldmask);
-
- return err;
-}
-
-/*
- * Determine which stack to use..
- */
-static inline void __user *
-get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
-{
- if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
- sp = current->sas_ss_sp + current->sas_ss_size;
-
- return (void __user *)((sp - frame_size) & -8ul);
-}
-
-void sa_default_restorer(void); /* See comments below */
-void sa_default_rt_restorer(void); /* See comments below */
-
-static void setup_frame(int sig, struct k_sigaction *ka,
- sigset_t *set, struct pt_regs *regs)
-{
- struct sigframe __user *frame;
- int err = 0;
- int signal;
-
- frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame));
-
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
-
- signal = current_thread_info()->exec_domain
- && current_thread_info()->exec_domain->signal_invmap
- && sig < 32
- ? current_thread_info()->exec_domain->signal_invmap[sig]
- : sig;
-
- err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
-
- /* Give up earlier as i386, in case */
- if (err)
- goto give_sigsegv;
-
- if (_NSIG_WORDS > 1) {
- err |= __copy_to_user(frame->extramask, &set->sig[1],
- sizeof(frame->extramask)); }
-
- /* Give up earlier as i386, in case */
- if (err)
- goto give_sigsegv;
-
- /* Set up to return from userspace. If provided, use a stub
- already in userspace. */
- if (ka->sa.sa_flags & SA_RESTORER) {
- DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1;
-
- /*
- * On SH5 all edited pointers are subject to NEFF
- */
- DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
- (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
- } else {
- /*
- * Different approach on SH5.
- * . Endianness independent asm code gets placed in entry.S .
- * This is limited to four ASM instructions corresponding
- * to two long longs in size.
- * . err checking is done on the else branch only
- * . flush_icache_range() is called upon __put_user() only
- * . all edited pointers are subject to NEFF
- * . being code, linker turns ShMedia bit on, always
- * dereference index -1.
- */
- DEREF_REG_PR = (unsigned long) frame->retcode | 0x01;
- DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
- (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
-
- if (__copy_to_user(frame->retcode,
- (unsigned long long)sa_default_restorer & (~1), 16) != 0)
- goto give_sigsegv;
-
- /* Cohere the trampoline with the I-cache. */
- flush_cache_sigtramp(DEREF_REG_PR-1, DEREF_REG_PR-1+16);
- }
-
- /*
- * Set up registers for signal handler.
- * All edited pointers are subject to NEFF.
- */
- regs->regs[REG_SP] = (unsigned long) frame;
- regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ?
- (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP];
- regs->regs[REG_ARG1] = signal; /* Arg for signal handler */
-
- /* FIXME:
- The glibc profiling support for SH-5 needs to be passed a sigcontext
- so it can retrieve the PC. At some point during 2003 the glibc
- support was changed to receive the sigcontext through the 2nd
- argument, but there are still versions of libc.so in use that use
- the 3rd argument. Until libc.so is stabilised, pass the sigcontext
- through both 2nd and 3rd arguments.
- */
-
- regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
- regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
-
- regs->pc = (unsigned long) ka->sa.sa_handler;
- regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc;
-
- set_fs(USER_DS);
-
-#if DEBUG_SIG
- /* Broken %016Lx */
- printk("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n",
- signal,
- current->comm, current->pid, frame,
- regs->pc >> 32, regs->pc & 0xffffffff,
- DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);
-#endif
-
- return;
-
-give_sigsegv:
- force_sigsegv(sig, current);
-}
-
-static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
-{
- struct rt_sigframe __user *frame;
- int err = 0;
- int signal;
-
- frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame));
-
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
-
- signal = current_thread_info()->exec_domain
- && current_thread_info()->exec_domain->signal_invmap
- && sig < 32
- ? current_thread_info()->exec_domain->signal_invmap[sig]
- : sig;
-
- err |= __put_user(&frame->info, &frame->pinfo);
- err |= __put_user(&frame->uc, &frame->puc);
- err |= copy_siginfo_to_user(&frame->info, info);
-
- /* Give up earlier as i386, in case */
- if (err)
- goto give_sigsegv;
-
- /* Create the ucontext. */
- err |= __put_user(0, &frame->uc.uc_flags);
- err |= __put_user(0, &frame->uc.uc_link);
- err |= __put_user((void *)current->sas_ss_sp,
- &frame->uc.uc_stack.ss_sp);
- err |= __put_user(sas_ss_flags(regs->regs[REG_SP]),
- &frame->uc.uc_stack.ss_flags);
- err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
- err |= setup_sigcontext(&frame->uc.uc_mcontext,
- regs, set->sig[0]);
- err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-
- /* Give up earlier as i386, in case */
- if (err)
- goto give_sigsegv;
-
- /* Set up to return from userspace. If provided, use a stub
- already in userspace. */
- if (ka->sa.sa_flags & SA_RESTORER) {
- DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1;
-
- /*
- * On SH5 all edited pointers are subject to NEFF
- */
- DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
- (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
- } else {
- /*
- * Different approach on SH5.
- * . Endianness independent asm code gets placed in entry.S .
- * This is limited to four ASM instructions corresponding
- * to two long longs in size.
- * . err checking is done on the else branch only
- * . flush_icache_range() is called upon __put_user() only
- * . all edited pointers are subject to NEFF
- * . being code, linker turns ShMedia bit on, always
- * dereference index -1.
- */
-
- DEREF_REG_PR = (unsigned long) frame->retcode | 0x01;
- DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
- (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
-
- if (__copy_to_user(frame->retcode,
- (unsigned long long)sa_default_rt_restorer & (~1), 16) != 0)
- goto give_sigsegv;
-
- flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15);
- }
-
- /*
- * Set up registers for signal handler.
- * All edited pointers are subject to NEFF.
- */
- regs->regs[REG_SP] = (unsigned long) frame;
- regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ?
- (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP];
- regs->regs[REG_ARG1] = signal; /* Arg for signal handler */
- regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info;
- regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext;
- regs->pc = (unsigned long) ka->sa.sa_handler;
- regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc;
-
- set_fs(USER_DS);
-
-#if DEBUG_SIG
- /* Broken %016Lx */
- printk("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n",
- signal,
- current->comm, current->pid, frame,
- regs->pc >> 32, regs->pc & 0xffffffff,
- DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);
-#endif
-
- return;
-
-give_sigsegv:
- force_sigsegv(sig, current);
-}
-
-/*
- * OK, we're invoking a handler
- */
-
-static void
-handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
- sigset_t *oldset, struct pt_regs * regs)
-{
- /* Are we from a system call? */
- if (regs->syscall_nr >= 0) {
- /* If so, check system call restarting.. */
- switch (regs->regs[REG_RET]) {
- case -ERESTART_RESTARTBLOCK:
- case -ERESTARTNOHAND:
- regs->regs[REG_RET] = -EINTR;
- break;
-
- case -ERESTARTSYS:
- if (!(ka->sa.sa_flags & SA_RESTART)) {
- regs->regs[REG_RET] = -EINTR;
- break;
- }
- /* fallthrough */
- case -ERESTARTNOINTR:
- /* Decode syscall # */
- regs->regs[REG_RET] = regs->syscall_nr;
- regs->pc -= 4;
- }
- }
-
- /* Set up the stack frame */
- if (ka->sa.sa_flags & SA_SIGINFO)
- setup_rt_frame(sig, ka, info, oldset, regs);
- else
- setup_frame(sig, ka, oldset, regs);
-
- spin_lock_irq(&current->sighand->siglock);
- sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
- if (!(ka->sa.sa_flags & SA_NODEFER))
- sigaddset(&current->blocked,sig);
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
-}
-
-/*
- * Note that 'init' is a special process: it doesn't get signals it doesn't
- * want to handle. Thus you cannot kill init even with a SIGKILL even by
- * mistake.
- *
- * Note that we go through the signals twice: once to check the signals that
- * the kernel can handle, and then we build all the user-level signal handling
- * stack-frames in one go after that.
- */
-int do_signal(struct pt_regs *regs, sigset_t *oldset)
-{
- siginfo_t info;
- int signr;
- struct k_sigaction ka;
-
- /*
- * We want the common case to go fast, which
- * is why we may in certain cases get here from
- * kernel mode. Just return without doing anything
- * if so.
- */
- if (!user_mode(regs))
- return 1;
-
- if (try_to_freeze())
- goto no_signal;
-
- if (test_thread_flag(TIF_RESTORE_SIGMASK))
- oldset = &current->saved_sigmask;
- else if (!oldset)
- oldset = &current->blocked;
-
- signr = get_signal_to_deliver(&info, &ka, regs, 0);
-
- if (signr > 0) {
- /* Whee! Actually deliver the signal. */
- handle_signal(signr, &info, &ka, oldset, regs);
-
- /*
- * If a signal was successfully delivered, the saved sigmask
- * is in its frame, and we can clear the TIF_RESTORE_SIGMASK
- * flag.
- */
- if (test_thread_flag(TIF_RESTORE_SIGMASK))
- clear_thread_flag(TIF_RESTORE_SIGMASK);
-
- return 1;
- }
-
-no_signal:
- /* Did we come from a system call? */
- if (regs->syscall_nr >= 0) {
- /* Restart the system call - no handlers present */
- switch (regs->regs[REG_RET]) {
- case -ERESTARTNOHAND:
- case -ERESTARTSYS:
- case -ERESTARTNOINTR:
- /* Decode Syscall # */
- regs->regs[REG_RET] = regs->syscall_nr;
- regs->pc -= 4;
- break;
-
- case -ERESTART_RESTARTBLOCK:
- regs->regs[REG_RET] = __NR_restart_syscall;
- regs->pc -= 4;
- break;
- }
- }
-
- /* No signal to deliver -- put the saved sigmask back */
- if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
- clear_thread_flag(TIF_RESTORE_SIGMASK);
- sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
- }
-
- return 0;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-27 02:52:50 +0000