![David S. Miller](/assets/img/avatar_default.png)
This is mandatory for 64-bit processes, and doing it also for 32-bit processes saves a conditional in the compat case. This fixes the glibc/nptl/tst-stdio1 test case, as well as many others, on 64-bit. Signed-off-by: David S. Miller <davem@davemloft.net>
636 lines
17 KiB
C
636 lines
17 KiB
C
/* linux/arch/sparc/kernel/signal.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
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* Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
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*/
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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#include <linux/unistd.h>
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#include <linux/mm.h>
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#include <linux/tty.h>
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#include <linux/smp.h>
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#include <linux/binfmts.h> /* do_coredum */
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#include <linux/bitops.h>
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#include <linux/tracehook.h>
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#include <asm/uaccess.h>
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#include <asm/ptrace.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/cacheflush.h> /* flush_sig_insns */
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
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void *fpqueue, unsigned long *fpqdepth);
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extern void fpload(unsigned long *fpregs, unsigned long *fsr);
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struct signal_frame {
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struct sparc_stackf ss;
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__siginfo32_t info;
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__siginfo_fpu_t __user *fpu_save;
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unsigned long insns[2] __attribute__ ((aligned (8)));
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unsigned int extramask[_NSIG_WORDS - 1];
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unsigned int extra_size; /* Should be 0 */
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__siginfo_fpu_t fpu_state;
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};
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struct rt_signal_frame {
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struct sparc_stackf ss;
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siginfo_t info;
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struct pt_regs regs;
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sigset_t mask;
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__siginfo_fpu_t __user *fpu_save;
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unsigned int insns[2];
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stack_t stack;
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unsigned int extra_size; /* Should be 0 */
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__siginfo_fpu_t fpu_state;
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};
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/* Align macros */
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#define SF_ALIGNEDSZ (((sizeof(struct signal_frame) + 7) & (~7)))
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#define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
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static int _sigpause_common(old_sigset_t set)
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{
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set &= _BLOCKABLE;
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spin_lock_irq(¤t->sighand->siglock);
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current->saved_sigmask = current->blocked;
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siginitset(¤t->blocked, set);
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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set_thread_flag(TIF_RESTORE_SIGMASK);
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return -ERESTARTNOHAND;
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}
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asmlinkage int sys_sigsuspend(old_sigset_t set)
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{
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return _sigpause_common(set);
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}
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static inline int
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restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
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{
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int err;
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#ifdef CONFIG_SMP
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if (test_tsk_thread_flag(current, TIF_USEDFPU))
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regs->psr &= ~PSR_EF;
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#else
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if (current == last_task_used_math) {
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last_task_used_math = NULL;
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regs->psr &= ~PSR_EF;
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}
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#endif
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set_used_math();
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clear_tsk_thread_flag(current, TIF_USEDFPU);
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if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
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return -EFAULT;
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err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0],
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(sizeof(unsigned long) * 32));
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err |= __get_user(current->thread.fsr, &fpu->si_fsr);
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err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
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if (current->thread.fpqdepth != 0)
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err |= __copy_from_user(¤t->thread.fpqueue[0],
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&fpu->si_fpqueue[0],
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((sizeof(unsigned long) +
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(sizeof(unsigned long *)))*16));
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return err;
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}
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asmlinkage void do_sigreturn(struct pt_regs *regs)
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{
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struct signal_frame __user *sf;
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unsigned long up_psr, pc, npc;
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sigset_t set;
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__siginfo_fpu_t __user *fpu_save;
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int err;
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/* Always make any pending restarted system calls return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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synchronize_user_stack();
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sf = (struct signal_frame __user *) regs->u_regs[UREG_FP];
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/* 1. Make sure we are not getting garbage from the user */
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if (!access_ok(VERIFY_READ, sf, sizeof(*sf)))
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goto segv_and_exit;
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if (((unsigned long) sf) & 3)
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goto segv_and_exit;
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err = __get_user(pc, &sf->info.si_regs.pc);
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err |= __get_user(npc, &sf->info.si_regs.npc);
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if ((pc | npc) & 3)
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goto segv_and_exit;
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/* 2. Restore the state */
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up_psr = regs->psr;
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err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs));
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/* User can only change condition codes and FPU enabling in %psr. */
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regs->psr = (up_psr & ~(PSR_ICC | PSR_EF))
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| (regs->psr & (PSR_ICC | PSR_EF));
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/* Prevent syscall restart. */
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pt_regs_clear_syscall(regs);
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err |= __get_user(fpu_save, &sf->fpu_save);
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if (fpu_save)
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err |= restore_fpu_state(regs, fpu_save);
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/* This is pretty much atomic, no amount locking would prevent
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* the races which exist anyways.
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*/
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err |= __get_user(set.sig[0], &sf->info.si_mask);
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err |= __copy_from_user(&set.sig[1], &sf->extramask,
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(_NSIG_WORDS-1) * sizeof(unsigned int));
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if (err)
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goto segv_and_exit;
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sigdelsetmask(&set, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = set;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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return;
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segv_and_exit:
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force_sig(SIGSEGV, current);
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}
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asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
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{
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struct rt_signal_frame __user *sf;
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unsigned int psr, pc, npc;
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__siginfo_fpu_t __user *fpu_save;
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mm_segment_t old_fs;
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sigset_t set;
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stack_t st;
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int err;
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synchronize_user_stack();
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sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
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if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
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(((unsigned long) sf) & 0x03))
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goto segv;
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err = __get_user(pc, &sf->regs.pc);
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err |= __get_user(npc, &sf->regs.npc);
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err |= ((pc | npc) & 0x03);
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err |= __get_user(regs->y, &sf->regs.y);
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err |= __get_user(psr, &sf->regs.psr);
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err |= __copy_from_user(®s->u_regs[UREG_G1],
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&sf->regs.u_regs[UREG_G1], 15 * sizeof(u32));
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regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);
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/* Prevent syscall restart. */
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pt_regs_clear_syscall(regs);
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err |= __get_user(fpu_save, &sf->fpu_save);
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if (fpu_save)
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err |= restore_fpu_state(regs, fpu_save);
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err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
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err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
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if (err)
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goto segv;
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regs->pc = pc;
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regs->npc = npc;
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/* It is more difficult to avoid calling this function than to
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* call it and ignore errors.
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*/
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old_fs = get_fs();
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set_fs(KERNEL_DS);
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do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
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set_fs(old_fs);
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sigdelsetmask(&set, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = set;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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return;
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segv:
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force_sig(SIGSEGV, current);
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}
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/* Checks if the fp is valid */
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static inline int invalid_frame_pointer(void __user *fp, int fplen)
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{
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if ((((unsigned long) fp) & 7) ||
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!__access_ok((unsigned long)fp, fplen) ||
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((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) &&
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((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000)))
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return 1;
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return 0;
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}
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static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
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{
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unsigned long sp = regs->u_regs[UREG_FP];
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/*
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* If we are on the alternate signal stack and would overflow it, don't.
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* Return an always-bogus address instead so we will die with SIGSEGV.
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*/
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if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
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return (void __user *) -1L;
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/* This is the X/Open sanctioned signal stack switching. */
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if (sa->sa_flags & SA_ONSTACK) {
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if (sas_ss_flags(sp) == 0)
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sp = current->sas_ss_sp + current->sas_ss_size;
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}
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sp -= framesize;
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/* Always align the stack frame. This handles two cases. First,
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* sigaltstack need not be mindful of platform specific stack
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* alignment. Second, if we took this signal because the stack
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* is not aligned properly, we'd like to take the signal cleanly
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* and report that.
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*/
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sp &= ~15UL;
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return (void __user *) sp;
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}
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static inline int
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save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
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{
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int err = 0;
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#ifdef CONFIG_SMP
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if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
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put_psr(get_psr() | PSR_EF);
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fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
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¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
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regs->psr &= ~(PSR_EF);
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clear_tsk_thread_flag(current, TIF_USEDFPU);
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}
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#else
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if (current == last_task_used_math) {
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put_psr(get_psr() | PSR_EF);
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fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
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¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
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last_task_used_math = NULL;
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regs->psr &= ~(PSR_EF);
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}
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#endif
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err |= __copy_to_user(&fpu->si_float_regs[0],
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¤t->thread.float_regs[0],
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(sizeof(unsigned long) * 32));
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err |= __put_user(current->thread.fsr, &fpu->si_fsr);
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err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
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if (current->thread.fpqdepth != 0)
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err |= __copy_to_user(&fpu->si_fpqueue[0],
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¤t->thread.fpqueue[0],
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((sizeof(unsigned long) +
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(sizeof(unsigned long *)))*16));
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clear_used_math();
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return err;
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}
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static void setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
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int signo, sigset_t *oldset)
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{
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struct signal_frame __user *sf;
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int sigframe_size, err;
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/* 1. Make sure everything is clean */
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synchronize_user_stack();
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sigframe_size = SF_ALIGNEDSZ;
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if (!used_math())
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sigframe_size -= sizeof(__siginfo_fpu_t);
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sf = (struct signal_frame __user *)
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get_sigframe(&ka->sa, regs, sigframe_size);
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if (invalid_frame_pointer(sf, sigframe_size))
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goto sigill_and_return;
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if (current_thread_info()->w_saved != 0)
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goto sigill_and_return;
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/* 2. Save the current process state */
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err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs));
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err |= __put_user(0, &sf->extra_size);
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if (used_math()) {
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err |= save_fpu_state(regs, &sf->fpu_state);
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err |= __put_user(&sf->fpu_state, &sf->fpu_save);
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} else {
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err |= __put_user(0, &sf->fpu_save);
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}
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err |= __put_user(oldset->sig[0], &sf->info.si_mask);
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err |= __copy_to_user(sf->extramask, &oldset->sig[1],
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(_NSIG_WORDS - 1) * sizeof(unsigned int));
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err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
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sizeof(struct reg_window32));
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if (err)
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goto sigsegv;
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/* 3. signal handler back-trampoline and parameters */
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regs->u_regs[UREG_FP] = (unsigned long) sf;
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regs->u_regs[UREG_I0] = signo;
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regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
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regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
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/* 4. signal handler */
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regs->pc = (unsigned long) ka->sa.sa_handler;
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regs->npc = (regs->pc + 4);
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/* 5. return to kernel instructions */
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if (ka->ka_restorer)
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regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
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else {
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regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
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/* mov __NR_sigreturn, %g1 */
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err |= __put_user(0x821020d8, &sf->insns[0]);
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/* t 0x10 */
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err |= __put_user(0x91d02010, &sf->insns[1]);
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if (err)
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goto sigsegv;
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/* Flush instruction space. */
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flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
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}
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return;
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sigill_and_return:
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do_exit(SIGILL);
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sigsegv:
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force_sigsegv(signo, current);
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}
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static void setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
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int signo, sigset_t *oldset, siginfo_t *info)
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{
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struct rt_signal_frame __user *sf;
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int sigframe_size;
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unsigned int psr;
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int err;
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synchronize_user_stack();
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sigframe_size = RT_ALIGNEDSZ;
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if (!used_math())
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sigframe_size -= sizeof(__siginfo_fpu_t);
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sf = (struct rt_signal_frame __user *)
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get_sigframe(&ka->sa, regs, sigframe_size);
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if (invalid_frame_pointer(sf, sigframe_size))
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goto sigill;
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if (current_thread_info()->w_saved != 0)
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goto sigill;
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err = __put_user(regs->pc, &sf->regs.pc);
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err |= __put_user(regs->npc, &sf->regs.npc);
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err |= __put_user(regs->y, &sf->regs.y);
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psr = regs->psr;
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if (used_math())
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psr |= PSR_EF;
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err |= __put_user(psr, &sf->regs.psr);
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err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs));
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err |= __put_user(0, &sf->extra_size);
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if (psr & PSR_EF) {
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err |= save_fpu_state(regs, &sf->fpu_state);
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err |= __put_user(&sf->fpu_state, &sf->fpu_save);
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} else {
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err |= __put_user(0, &sf->fpu_save);
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}
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err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
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/* Setup sigaltstack */
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err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
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err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
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err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
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err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
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sizeof(struct reg_window32));
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err |= copy_siginfo_to_user(&sf->info, info);
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if (err)
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goto sigsegv;
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regs->u_regs[UREG_FP] = (unsigned long) sf;
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regs->u_regs[UREG_I0] = signo;
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regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
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regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
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regs->pc = (unsigned long) ka->sa.sa_handler;
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regs->npc = (regs->pc + 4);
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if (ka->ka_restorer)
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regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
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else {
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regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
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/* mov __NR_sigreturn, %g1 */
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err |= __put_user(0x821020d8, &sf->insns[0]);
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/* t 0x10 */
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err |= __put_user(0x91d02010, &sf->insns[1]);
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if (err)
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goto sigsegv;
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|
|
/* 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(¤t->sighand->siglock);
|
|
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
|
|
if (!(ka->sa.sa_flags & SA_NOMASK))
|
|
sigaddset(¤t->blocked, signr);
|
|
recalc_sigpending();
|
|
spin_unlock_irq(¤t->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 = ¤t->saved_sigmask;
|
|
else
|
|
oldset = ¤t->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, ¤t->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);
|
|
if (current->replacement_session_keyring)
|
|
key_replace_session_keyring();
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|