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-rw-r--r--arch/sparc/kernel/signal.c631
1 files changed, 0 insertions, 631 deletions
diff --git a/arch/sparc/kernel/signal.c b/arch/sparc/kernel/signal.c
deleted file mode 100644
index c94f91c8b6e..00000000000
--- a/arch/sparc/kernel/signal.c
+++ /dev/null
@@ -1,631 +0,0 @@
-/* linux/arch/sparc/kernel/signal.c
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
- * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
- */
-
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/signal.h>
-#include <linux/errno.h>
-#include <linux/wait.h>
-#include <linux/ptrace.h>
-#include <linux/unistd.h>
-#include <linux/mm.h>
-#include <linux/tty.h>
-#include <linux/smp.h>
-#include <linux/binfmts.h> /* do_coredum */
-#include <linux/bitops.h>
-#include <linux/tracehook.h>
-
-#include <asm/uaccess.h>
-#include <asm/ptrace.h>
-#include <asm/pgalloc.h>
-#include <asm/pgtable.h>
-#include <asm/cacheflush.h> /* flush_sig_insns */
-
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
-extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
- void *fpqueue, unsigned long *fpqdepth);
-extern void fpload(unsigned long *fpregs, unsigned long *fsr);
-
-struct signal_frame {
- struct sparc_stackf ss;
- __siginfo_t info;
- __siginfo_fpu_t __user *fpu_save;
- unsigned long insns[2] __attribute__ ((aligned (8)));
- unsigned int extramask[_NSIG_WORDS - 1];
- unsigned int extra_size; /* Should be 0 */
- __siginfo_fpu_t fpu_state;
-};
-
-struct rt_signal_frame {
- struct sparc_stackf ss;
- siginfo_t info;
- struct pt_regs regs;
- sigset_t mask;
- __siginfo_fpu_t __user *fpu_save;
- unsigned int insns[2];
- stack_t stack;
- unsigned int extra_size; /* Should be 0 */
- __siginfo_fpu_t fpu_state;
-};
-
-/* Align macros */
-#define SF_ALIGNEDSZ (((sizeof(struct signal_frame) + 7) & (~7)))
-#define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
-
-static int _sigpause_common(old_sigset_t set)
-{
- set &= _BLOCKABLE;
- spin_lock_irq(&current->sighand->siglock);
- current->saved_sigmask = current->blocked;
- siginitset(&current->blocked, set);
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
-
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- set_thread_flag(TIF_RESTORE_SIGMASK);
-
- return -ERESTARTNOHAND;
-}
-
-asmlinkage int sys_sigsuspend(old_sigset_t set)
-{
- return _sigpause_common(set);
-}
-
-static inline int
-restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
-{
- int err;
-#ifdef CONFIG_SMP
- if (test_tsk_thread_flag(current, TIF_USEDFPU))
- regs->psr &= ~PSR_EF;
-#else
- if (current == last_task_used_math) {
- last_task_used_math = NULL;
- regs->psr &= ~PSR_EF;
- }
-#endif
- set_used_math();
- clear_tsk_thread_flag(current, TIF_USEDFPU);
-
- if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
- return -EFAULT;
-
- err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
- (sizeof(unsigned long) * 32));
- err |= __get_user(current->thread.fsr, &fpu->si_fsr);
- err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
- if (current->thread.fpqdepth != 0)
- err |= __copy_from_user(&current->thread.fpqueue[0],
- &fpu->si_fpqueue[0],
- ((sizeof(unsigned long) +
- (sizeof(unsigned long *)))*16));
- return err;
-}
-
-asmlinkage void do_sigreturn(struct pt_regs *regs)
-{
- struct signal_frame __user *sf;
- unsigned long up_psr, pc, npc;
- sigset_t set;
- __siginfo_fpu_t __user *fpu_save;
- int err;
-
- /* Always make any pending restarted system calls return -EINTR */
- current_thread_info()->restart_block.fn = do_no_restart_syscall;
-
- synchronize_user_stack();
-
- sf = (struct signal_frame __user *) regs->u_regs[UREG_FP];
-
- /* 1. Make sure we are not getting garbage from the user */
- if (!access_ok(VERIFY_READ, sf, sizeof(*sf)))
- goto segv_and_exit;
-
- if (((unsigned long) sf) & 3)
- goto segv_and_exit;
-
- err = __get_user(pc, &sf->info.si_regs.pc);
- err |= __get_user(npc, &sf->info.si_regs.npc);
-
- if ((pc | npc) & 3)
- goto segv_and_exit;
-
- /* 2. Restore the state */
- up_psr = regs->psr;
- err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs));
-
- /* User can only change condition codes and FPU enabling in %psr. */
- regs->psr = (up_psr & ~(PSR_ICC | PSR_EF))
- | (regs->psr & (PSR_ICC | PSR_EF));
-
- /* Prevent syscall restart. */
- pt_regs_clear_syscall(regs);
-
- err |= __get_user(fpu_save, &sf->fpu_save);
-
- if (fpu_save)
- err |= restore_fpu_state(regs, fpu_save);
-
- /* This is pretty much atomic, no amount locking would prevent
- * the races which exist anyways.
- */
- err |= __get_user(set.sig[0], &sf->info.si_mask);
- err |= __copy_from_user(&set.sig[1], &sf->extramask,
- (_NSIG_WORDS-1) * sizeof(unsigned int));
-
- if (err)
- goto segv_and_exit;
-
- sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(&current->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
- return;
-
-segv_and_exit:
- force_sig(SIGSEGV, current);
-}
-
-asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
-{
- struct rt_signal_frame __user *sf;
- unsigned int psr, pc, npc;
- __siginfo_fpu_t __user *fpu_save;
- mm_segment_t old_fs;
- sigset_t set;
- stack_t st;
- int err;
-
- synchronize_user_stack();
- sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
- if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
- (((unsigned long) sf) & 0x03))
- goto segv;
-
- err = __get_user(pc, &sf->regs.pc);
- err |= __get_user(npc, &sf->regs.npc);
- err |= ((pc | npc) & 0x03);
-
- err |= __get_user(regs->y, &sf->regs.y);
- err |= __get_user(psr, &sf->regs.psr);
-
- err |= __copy_from_user(&regs->u_regs[UREG_G1],
- &sf->regs.u_regs[UREG_G1], 15 * sizeof(u32));
-
- regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);
-
- /* Prevent syscall restart. */
- pt_regs_clear_syscall(regs);
-
- err |= __get_user(fpu_save, &sf->fpu_save);
-
- if (fpu_save)
- err |= restore_fpu_state(regs, fpu_save);
- err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
-
- err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
-
- if (err)
- goto segv;
-
- regs->pc = pc;
- regs->npc = npc;
-
- /* It is more difficult to avoid calling this function than to
- * call it and ignore errors.
- */
- old_fs = get_fs();
- set_fs(KERNEL_DS);
- do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
- set_fs(old_fs);
-
- sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(&current->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
- return;
-segv:
- force_sig(SIGSEGV, current);
-}
-
-/* Checks if the fp is valid */
-static inline int invalid_frame_pointer(void __user *fp, int fplen)
-{
- if ((((unsigned long) fp) & 7) ||
- !__access_ok((unsigned long)fp, fplen) ||
- ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) &&
- ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000)))
- return 1;
-
- return 0;
-}
-
-static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
-{
- unsigned long sp = regs->u_regs[UREG_FP];
-
- /*
- * If we are on the alternate signal stack and would overflow it, don't.
- * Return an always-bogus address instead so we will die with SIGSEGV.
- */
- if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
- return (void __user *) -1L;
-
- /* This is the X/Open sanctioned signal stack switching. */
- if (sa->sa_flags & SA_ONSTACK) {
- if (sas_ss_flags(sp) == 0)
- sp = current->sas_ss_sp + current->sas_ss_size;
- }
-
- /* Always align the stack frame. This handles two cases. First,
- * sigaltstack need not be mindful of platform specific stack
- * alignment. Second, if we took this signal because the stack
- * is not aligned properly, we'd like to take the signal cleanly
- * and report that.
- */
- sp &= ~7UL;
-
- return (void __user *)(sp - framesize);
-}
-
-static inline int
-save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
-{
- int err = 0;
-#ifdef CONFIG_SMP
- if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
- put_psr(get_psr() | PSR_EF);
- fpsave(&current->thread.float_regs[0], &current->thread.fsr,
- &current->thread.fpqueue[0], &current->thread.fpqdepth);
- regs->psr &= ~(PSR_EF);
- clear_tsk_thread_flag(current, TIF_USEDFPU);
- }
-#else
- if (current == last_task_used_math) {
- put_psr(get_psr() | PSR_EF);
- fpsave(&current->thread.float_regs[0], &current->thread.fsr,
- &current->thread.fpqueue[0], &current->thread.fpqdepth);
- last_task_used_math = NULL;
- regs->psr &= ~(PSR_EF);
- }
-#endif
- err |= __copy_to_user(&fpu->si_float_regs[0],
- &current->thread.float_regs[0],
- (sizeof(unsigned long) * 32));
- err |= __put_user(current->thread.fsr, &fpu->si_fsr);
- err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
- if (current->thread.fpqdepth != 0)
- err |= __copy_to_user(&fpu->si_fpqueue[0],
- &current->thread.fpqueue[0],
- ((sizeof(unsigned long) +
- (sizeof(unsigned long *)))*16));
- clear_used_math();
- return err;
-}
-
-static void setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
- int signo, sigset_t *oldset)
-{
- struct signal_frame __user *sf;
- int sigframe_size, err;
-
- /* 1. Make sure everything is clean */
- synchronize_user_stack();
-
- sigframe_size = SF_ALIGNEDSZ;
- if (!used_math())
- sigframe_size -= sizeof(__siginfo_fpu_t);
-
- sf = (struct signal_frame __user *)
- get_sigframe(&ka->sa, regs, sigframe_size);
-
- if (invalid_frame_pointer(sf, sigframe_size))
- goto sigill_and_return;
-
- if (current_thread_info()->w_saved != 0)
- goto sigill_and_return;
-
- /* 2. Save the current process state */
- err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs));
-
- err |= __put_user(0, &sf->extra_size);
-
- if (used_math()) {
- err |= save_fpu_state(regs, &sf->fpu_state);
- err |= __put_user(&sf->fpu_state, &sf->fpu_save);
- } else {
- err |= __put_user(0, &sf->fpu_save);
- }
-
- err |= __put_user(oldset->sig[0], &sf->info.si_mask);
- err |= __copy_to_user(sf->extramask, &oldset->sig[1],
- (_NSIG_WORDS - 1) * sizeof(unsigned int));
- err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
- sizeof(struct reg_window));
- if (err)
- goto sigsegv;
-
- /* 3. signal handler back-trampoline and parameters */
- regs->u_regs[UREG_FP] = (unsigned long) sf;
- regs->u_regs[UREG_I0] = signo;
- regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
- regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
-
- /* 4. signal handler */
- regs->pc = (unsigned long) ka->sa.sa_handler;
- regs->npc = (regs->pc + 4);
-
- /* 5. return to kernel instructions */
- if (ka->ka_restorer)
- regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
- else {
- regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
-
- /* mov __NR_sigreturn, %g1 */
- err |= __put_user(0x821020d8, &sf->insns[0]);
-
- /* t 0x10 */
- err |= __put_user(0x91d02010, &sf->insns[1]);
- if (err)
- goto sigsegv;
-
- /* Flush instruction space. */
- flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
- }
- return;
-
-sigill_and_return:
- do_exit(SIGILL);
-sigsegv:
- force_sigsegv(signo, current);
-}
-
-static void setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
- int signo, sigset_t *oldset, siginfo_t *info)
-{
- struct rt_signal_frame __user *sf;
- int sigframe_size;
- unsigned int psr;
- int err;
-
- synchronize_user_stack();
- sigframe_size = RT_ALIGNEDSZ;
- if (!used_math())
- sigframe_size -= sizeof(__siginfo_fpu_t);
- sf = (struct rt_signal_frame __user *)
- get_sigframe(&ka->sa, regs, sigframe_size);
- if (invalid_frame_pointer(sf, sigframe_size))
- goto sigill;
- if (current_thread_info()->w_saved != 0)
- goto sigill;
-
- err = __put_user(regs->pc, &sf->regs.pc);
- err |= __put_user(regs->npc, &sf->regs.npc);
- err |= __put_user(regs->y, &sf->regs.y);
- psr = regs->psr;
- if (used_math())
- psr |= PSR_EF;
- err |= __put_user(psr, &sf->regs.psr);
- err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs));
- err |= __put_user(0, &sf->extra_size);
-
- if (psr & PSR_EF) {
- err |= save_fpu_state(regs, &sf->fpu_state);
- err |= __put_user(&sf->fpu_state, &sf->fpu_save);
- } else {
- err |= __put_user(0, &sf->fpu_save);
- }
- err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
-
- /* Setup sigaltstack */
- err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
- err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
- err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
-
- err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
- sizeof(struct reg_window));
-
- err |= copy_siginfo_to_user(&sf->info, info);
-
- if (err)
- goto sigsegv;
-
- regs->u_regs[UREG_FP] = (unsigned long) sf;
- regs->u_regs[UREG_I0] = signo;
- regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
- regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
-
- regs->pc = (unsigned long) ka->sa.sa_handler;
- regs->npc = (regs->pc + 4);
-
- if (ka->ka_restorer)
- regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
- else {
- regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
-
- /* mov __NR_sigreturn, %g1 */
- err |= __put_user(0x821020d8, &sf->insns[0]);
-
- /* t 0x10 */
- err |= __put_user(0x91d02010, &sf->insns[1]);
- if (err)
- goto sigsegv;
-
- /* Flush instruction space. */
- flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
- }
- return;
-
-sigill:
- do_exit(SIGILL);
-sigsegv:
- force_sigsegv(signo, current);
-}
-
-static inline void
-handle_signal(unsigned long signr, struct k_sigaction *ka,
- siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
-{
- if (ka->sa.sa_flags & SA_SIGINFO)
- setup_rt_frame(ka, regs, signr, oldset, info);
- else
- setup_frame(ka, regs, signr, oldset);
-
- spin_lock_irq(&current->sighand->siglock);
- sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
- if (!(ka->sa.sa_flags & SA_NOMASK))
- sigaddset(&current->blocked, signr);
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
-}
-
-static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
- struct sigaction *sa)
-{
- switch(regs->u_regs[UREG_I0]) {
- case ERESTART_RESTARTBLOCK:
- case ERESTARTNOHAND:
- no_system_call_restart:
- regs->u_regs[UREG_I0] = EINTR;
- regs->psr |= PSR_C;
- break;
- case ERESTARTSYS:
- if (!(sa->sa_flags & SA_RESTART))
- goto no_system_call_restart;
- /* fallthrough */
- case ERESTARTNOINTR:
- regs->u_regs[UREG_I0] = orig_i0;
- regs->pc -= 4;
- regs->npc -= 4;
- }
-}
-
-/* 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.
- */
-static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
-{
- struct k_sigaction ka;
- int restart_syscall;
- sigset_t *oldset;
- siginfo_t info;
- int signr;
-
- if (pt_regs_is_syscall(regs) && (regs->psr & PSR_C))
- restart_syscall = 1;
- else
- restart_syscall = 0;
-
- if (test_thread_flag(TIF_RESTORE_SIGMASK))
- oldset = &current->saved_sigmask;
- else
- oldset = &current->blocked;
-
- signr = get_signal_to_deliver(&info, &ka, regs, NULL);
-
- /* If the debugger messes with the program counter, it clears
- * the software "in syscall" bit, directing us to not perform
- * a syscall restart.
- */
- if (restart_syscall && !pt_regs_is_syscall(regs))
- restart_syscall = 0;
-
- if (signr > 0) {
- if (restart_syscall)
- syscall_restart(orig_i0, regs, &ka.sa);
- handle_signal(signr, &ka, &info, oldset, regs);
-
- /* a signal was successfully delivered; the saved
- * sigmask will have been stored in the signal frame,
- * and will be restored by sigreturn, so we can simply
- * clear the TIF_RESTORE_SIGMASK flag.
- */
- if (test_thread_flag(TIF_RESTORE_SIGMASK))
- clear_thread_flag(TIF_RESTORE_SIGMASK);
-
- tracehook_signal_handler(signr, &info, &ka, regs, 0);
- return;
- }
- if (restart_syscall &&
- (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
- regs->u_regs[UREG_I0] == ERESTARTSYS ||
- regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
- /* replay the system call when we are done */
- regs->u_regs[UREG_I0] = orig_i0;
- regs->pc -= 4;
- regs->npc -= 4;
- }
- if (restart_syscall &&
- regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
- regs->u_regs[UREG_G1] = __NR_restart_syscall;
- regs->pc -= 4;
- regs->npc -= 4;
- }
-
- /* if there's no signal to deliver, we just 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);
- }
-}
-
-void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0,
- unsigned long thread_info_flags)
-{
- if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
- do_signal(regs, orig_i0);
- if (thread_info_flags & _TIF_NOTIFY_RESUME) {
- clear_thread_flag(TIF_NOTIFY_RESUME);
- tracehook_notify_resume(regs);
- }
-}
-
-asmlinkage int
-do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr,
- unsigned long sp)
-{
- int ret = -EFAULT;
-
- /* First see if old state is wanted. */
- if (ossptr) {
- if (put_user(current->sas_ss_sp + current->sas_ss_size,
- &ossptr->the_stack) ||
- __put_user(on_sig_stack(sp), &ossptr->cur_status))
- goto out;
- }
-
- /* Now see if we want to update the new state. */
- if (ssptr) {
- char *ss_sp;
-
- if (get_user(ss_sp, &ssptr->the_stack))
- goto out;
- /* If the current stack was set with sigaltstack, don't
- swap stacks while we are on it. */
- ret = -EPERM;
- if (current->sas_ss_sp && on_sig_stack(sp))
- goto out;
-
- /* Since we don't know the extent of the stack, and we don't
- track onstack-ness, but rather calculate it, we must
- presume a size. Ho hum this interface is lossy. */
- current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
- current->sas_ss_size = SIGSTKSZ;
- }
- ret = 0;
-out:
- return ret;
-}
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