1124 lines
31 KiB
C
1124 lines
31 KiB
C
/* $Id: signal.c,v 1.110 2002/02/08 03:57:14 davem Exp $
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* 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 <asm/uaccess.h>
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#include <asm/ptrace.h>
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#include <asm/svr4.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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/* Signal frames: the original one (compatible with SunOS):
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*
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* Set up a signal frame... Make the stack look the way SunOS
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* expects it to look which is basically:
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*
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* ---------------------------------- <-- %sp at signal time
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* Struct sigcontext
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* Signal address
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* Ptr to sigcontext area above
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* Signal code
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* The signal number itself
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* One register window
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* ---------------------------------- <-- New %sp
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*/
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struct signal_sframe {
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struct reg_window sig_window;
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int sig_num;
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int sig_code;
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struct sigcontext __user *sig_scptr;
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int sig_address;
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struct sigcontext sig_context;
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unsigned int extramask[_NSIG_WORDS - 1];
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};
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/*
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* And the new one, intended to be used for Linux applications only
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* (we have enough in there to work with clone).
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* All the interesting bits are in the info field.
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*/
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struct new_signal_frame {
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struct sparc_stackf ss;
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__siginfo_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_sframe) + 7) & (~7)))
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#define NF_ALIGNEDSZ (((sizeof(struct new_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_sigpause(unsigned int set)
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{
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return _sigpause_common(set);
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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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static inline void do_new_sigreturn (struct pt_regs *regs)
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{
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struct new_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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sf = (struct new_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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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_sigreturn(struct pt_regs *regs)
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{
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struct sigcontext __user *scptr;
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unsigned long pc, npc, psr;
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sigset_t set;
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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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if (current->thread.new_signal) {
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do_new_sigreturn(regs);
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return;
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}
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scptr = (struct sigcontext __user *) regs->u_regs[UREG_I0];
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/* Check sanity of the user arg. */
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if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext)) ||
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(((unsigned long) scptr) & 3))
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goto segv_and_exit;
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err = __get_user(pc, &scptr->sigc_pc);
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err |= __get_user(npc, &scptr->sigc_npc);
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if ((pc | npc) & 3)
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goto segv_and_exit;
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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], &scptr->sigc_mask);
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/* Note that scptr + 1 points to extramask */
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err |= __copy_from_user(&set.sig[1], scptr + 1,
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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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regs->pc = pc;
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regs->npc = npc;
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err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp);
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err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0);
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err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1);
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/* User can only change condition codes in %psr. */
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err |= __get_user(psr, &scptr->sigc_psr);
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if (err)
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goto segv_and_exit;
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regs->psr &= ~(PSR_ICC);
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regs->psr |= (psr & PSR_ICC);
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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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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;
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sp = regs->u_regs[UREG_FP];
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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 (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7))
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sp = current->sas_ss_sp + current->sas_ss_size;
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}
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return (void __user *)(sp - framesize);
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}
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static inline void
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setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info)
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{
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struct signal_sframe __user *sframep;
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struct sigcontext __user *sc;
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int window = 0, err;
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unsigned long pc = regs->pc;
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unsigned long npc = regs->npc;
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struct thread_info *tp = current_thread_info();
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void __user *sig_address;
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int sig_code;
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synchronize_user_stack();
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sframep = (struct signal_sframe __user *)
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get_sigframe(sa, regs, SF_ALIGNEDSZ);
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if (invalid_frame_pointer(sframep, sizeof(*sframep))){
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/* Don't change signal code and address, so that
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* post mortem debuggers can have a look.
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*/
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goto sigill_and_return;
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}
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sc = &sframep->sig_context;
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/* We've already made sure frame pointer isn't in kernel space... */
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err = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK),
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&sc->sigc_onstack);
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err |= __put_user(oldset->sig[0], &sc->sigc_mask);
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err |= __copy_to_user(sframep->extramask, &oldset->sig[1],
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(_NSIG_WORDS - 1) * sizeof(unsigned int));
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err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp);
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err |= __put_user(pc, &sc->sigc_pc);
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err |= __put_user(npc, &sc->sigc_npc);
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err |= __put_user(regs->psr, &sc->sigc_psr);
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err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1);
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err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0);
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err |= __put_user(tp->w_saved, &sc->sigc_oswins);
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if (tp->w_saved)
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for (window = 0; window < tp->w_saved; window++) {
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put_user((char *)tp->rwbuf_stkptrs[window],
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&sc->sigc_spbuf[window]);
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err |= __copy_to_user(&sc->sigc_wbuf[window],
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&tp->reg_window[window],
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sizeof(struct reg_window));
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}
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else
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err |= __copy_to_user(sframep, (char *) regs->u_regs[UREG_FP],
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sizeof(struct reg_window));
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tp->w_saved = 0; /* So process is allowed to execute. */
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err |= __put_user(signr, &sframep->sig_num);
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sig_address = NULL;
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sig_code = 0;
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if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) {
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sig_address = info->si_addr;
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switch (signr) {
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case SIGSEGV:
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switch (info->si_code) {
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case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break;
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default: sig_code = SUBSIG_PROTECTION; break;
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}
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break;
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case SIGILL:
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switch (info->si_code) {
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case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break;
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case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break;
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case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break;
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default: sig_code = SUBSIG_STACK; break;
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}
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break;
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case SIGFPE:
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switch (info->si_code) {
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case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break;
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case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break;
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case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break;
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case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break;
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case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break;
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case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break;
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case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break;
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default: sig_code = SUBSIG_FPERROR; break;
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}
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break;
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case SIGBUS:
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switch (info->si_code) {
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case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break;
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case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break;
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default: sig_code = SUBSIG_BUSTIMEOUT; break;
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}
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break;
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case SIGEMT:
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switch (info->si_code) {
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case EMT_TAGOVF: sig_code = SUBSIG_TAG; break;
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}
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break;
|
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case SIGSYS:
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if (info->si_code == (__SI_FAULT|0x100)) {
|
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/* See sys_sunos.c */
|
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sig_code = info->si_trapno;
|
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break;
|
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}
|
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default:
|
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sig_address = NULL;
|
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}
|
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}
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err |= __put_user((unsigned long)sig_address, &sframep->sig_address);
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err |= __put_user(sig_code, &sframep->sig_code);
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err |= __put_user(sc, &sframep->sig_scptr);
|
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if (err)
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goto sigsegv;
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|
|
regs->u_regs[UREG_FP] = (unsigned long) sframep;
|
|
regs->pc = (unsigned long) sa->sa_handler;
|
|
regs->npc = (regs->pc + 4);
|
|
return;
|
|
|
|
sigill_and_return:
|
|
do_exit(SIGILL);
|
|
sigsegv:
|
|
force_sigsegv(signr, current);
|
|
}
|
|
|
|
|
|
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(¤t->thread.float_regs[0], ¤t->thread.fsr,
|
|
¤t->thread.fpqueue[0], ¤t->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(¤t->thread.float_regs[0], ¤t->thread.fsr,
|
|
¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
|
|
last_task_used_math = NULL;
|
|
regs->psr &= ~(PSR_EF);
|
|
}
|
|
#endif
|
|
err |= __copy_to_user(&fpu->si_float_regs[0],
|
|
¤t->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],
|
|
¤t->thread.fpqueue[0],
|
|
((sizeof(unsigned long) +
|
|
(sizeof(unsigned long *)))*16));
|
|
clear_used_math();
|
|
return err;
|
|
}
|
|
|
|
static inline void
|
|
new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
|
|
int signo, sigset_t *oldset)
|
|
{
|
|
struct new_signal_frame __user *sf;
|
|
int sigframe_size, err;
|
|
|
|
/* 1. Make sure everything is clean */
|
|
synchronize_user_stack();
|
|
|
|
sigframe_size = NF_ALIGNEDSZ;
|
|
if (!used_math())
|
|
sigframe_size -= sizeof(__siginfo_fpu_t);
|
|
|
|
sf = (struct new_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 inline void
|
|
new_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);
|
|
}
|
|
|
|
/* Setup a Solaris stack frame */
|
|
static inline void
|
|
setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc,
|
|
struct pt_regs *regs, int signr, sigset_t *oldset)
|
|
{
|
|
svr4_signal_frame_t __user *sfp;
|
|
svr4_gregset_t __user *gr;
|
|
svr4_siginfo_t __user *si;
|
|
svr4_mcontext_t __user *mc;
|
|
svr4_gwindows_t __user *gw;
|
|
svr4_ucontext_t __user *uc;
|
|
svr4_sigset_t setv;
|
|
struct thread_info *tp = current_thread_info();
|
|
int window = 0, err;
|
|
|
|
synchronize_user_stack();
|
|
sfp = (svr4_signal_frame_t __user *)
|
|
get_sigframe(sa, regs, SVR4_SF_ALIGNED + sizeof(struct reg_window));
|
|
|
|
if (invalid_frame_pointer(sfp, sizeof(*sfp)))
|
|
goto sigill_and_return;
|
|
|
|
/* Start with a clean frame pointer and fill it */
|
|
err = __clear_user(sfp, sizeof(*sfp));
|
|
|
|
/* Setup convenience variables */
|
|
si = &sfp->si;
|
|
uc = &sfp->uc;
|
|
gw = &sfp->gw;
|
|
mc = &uc->mcontext;
|
|
gr = &mc->greg;
|
|
|
|
/* FIXME: where am I supposed to put this?
|
|
* sc->sigc_onstack = old_status;
|
|
* anyways, it does not look like it is used for anything at all.
|
|
*/
|
|
setv.sigbits[0] = oldset->sig[0];
|
|
setv.sigbits[1] = oldset->sig[1];
|
|
if (_NSIG_WORDS >= 4) {
|
|
setv.sigbits[2] = oldset->sig[2];
|
|
setv.sigbits[3] = oldset->sig[3];
|
|
err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
|
|
} else
|
|
err |= __copy_to_user(&uc->sigmask, &setv,
|
|
2 * sizeof(unsigned int));
|
|
|
|
/* Store registers */
|
|
err |= __put_user(regs->pc, &((*gr)[SVR4_PC]));
|
|
err |= __put_user(regs->npc, &((*gr)[SVR4_NPC]));
|
|
err |= __put_user(regs->psr, &((*gr)[SVR4_PSR]));
|
|
err |= __put_user(regs->y, &((*gr)[SVR4_Y]));
|
|
|
|
/* Copy g[1..7] and o[0..7] registers */
|
|
err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs[UREG_G1],
|
|
sizeof(long) * 7);
|
|
err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs[UREG_I0],
|
|
sizeof(long) * 8);
|
|
|
|
/* Setup sigaltstack */
|
|
err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
|
|
err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
|
|
err |= __put_user(current->sas_ss_size, &uc->stack.size);
|
|
|
|
/* Save the currently window file: */
|
|
|
|
/* 1. Link sfp->uc->gwins to our windows */
|
|
err |= __put_user(gw, &mc->gwin);
|
|
|
|
/* 2. Number of windows to restore at setcontext(): */
|
|
err |= __put_user(tp->w_saved, &gw->count);
|
|
|
|
/* 3. Save each valid window
|
|
* Currently, it makes a copy of the windows from the kernel copy.
|
|
* David's code for SunOS, makes the copy but keeps the pointer to
|
|
* the kernel. My version makes the pointer point to a userland
|
|
* copy of those. Mhm, I wonder if I shouldn't just ignore those
|
|
* on setcontext and use those that are on the kernel, the signal
|
|
* handler should not be modyfing those, mhm.
|
|
*
|
|
* These windows are just used in case synchronize_user_stack failed
|
|
* to flush the user windows.
|
|
*/
|
|
for (window = 0; window < tp->w_saved; window++) {
|
|
err |= __put_user((int __user *) &(gw->win[window]), &gw->winptr[window]);
|
|
err |= __copy_to_user(&gw->win[window],
|
|
&tp->reg_window[window],
|
|
sizeof(svr4_rwindow_t));
|
|
err |= __put_user(0, gw->winptr[window]);
|
|
}
|
|
|
|
/* 4. We just pay attention to the gw->count field on setcontext */
|
|
tp->w_saved = 0; /* So process is allowed to execute. */
|
|
|
|
/* Setup the signal information. Solaris expects a bunch of
|
|
* information to be passed to the signal handler, we don't provide
|
|
* that much currently, should use siginfo.
|
|
*/
|
|
err |= __put_user(signr, &si->siginfo.signo);
|
|
err |= __put_user(SVR4_SINOINFO, &si->siginfo.code);
|
|
if (err)
|
|
goto sigsegv;
|
|
|
|
regs->u_regs[UREG_FP] = (unsigned long) sfp;
|
|
regs->pc = (unsigned long) sa->sa_handler;
|
|
regs->npc = (regs->pc + 4);
|
|
|
|
/* Arguments passed to signal handler */
|
|
if (regs->u_regs[14]){
|
|
struct reg_window __user *rw = (struct reg_window __user *)
|
|
regs->u_regs[14];
|
|
|
|
err |= __put_user(signr, &rw->ins[0]);
|
|
err |= __put_user(si, &rw->ins[1]);
|
|
err |= __put_user(uc, &rw->ins[2]);
|
|
err |= __put_user(sfp, &rw->ins[6]); /* frame pointer */
|
|
if (err)
|
|
goto sigsegv;
|
|
|
|
regs->u_regs[UREG_I0] = signr;
|
|
regs->u_regs[UREG_I1] = (unsigned long) si;
|
|
regs->u_regs[UREG_I2] = (unsigned long) uc;
|
|
}
|
|
return;
|
|
|
|
sigill_and_return:
|
|
do_exit(SIGILL);
|
|
sigsegv:
|
|
force_sigsegv(signr, current);
|
|
}
|
|
|
|
asmlinkage int svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs)
|
|
{
|
|
svr4_gregset_t __user *gr;
|
|
svr4_mcontext_t __user *mc;
|
|
svr4_sigset_t setv;
|
|
int err = 0;
|
|
|
|
synchronize_user_stack();
|
|
|
|
if (current_thread_info()->w_saved)
|
|
return -EFAULT;
|
|
|
|
err = clear_user(uc, sizeof(*uc));
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
/* Setup convenience variables */
|
|
mc = &uc->mcontext;
|
|
gr = &mc->greg;
|
|
|
|
setv.sigbits[0] = current->blocked.sig[0];
|
|
setv.sigbits[1] = current->blocked.sig[1];
|
|
if (_NSIG_WORDS >= 4) {
|
|
setv.sigbits[2] = current->blocked.sig[2];
|
|
setv.sigbits[3] = current->blocked.sig[3];
|
|
err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
|
|
} else
|
|
err |= __copy_to_user(&uc->sigmask, &setv,
|
|
2 * sizeof(unsigned int));
|
|
|
|
/* Store registers */
|
|
err |= __put_user(regs->pc, &uc->mcontext.greg[SVR4_PC]);
|
|
err |= __put_user(regs->npc, &uc->mcontext.greg[SVR4_NPC]);
|
|
err |= __put_user(regs->psr, &uc->mcontext.greg[SVR4_PSR]);
|
|
err |= __put_user(regs->y, &uc->mcontext.greg[SVR4_Y]);
|
|
|
|
/* Copy g[1..7] and o[0..7] registers */
|
|
err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs[UREG_G1],
|
|
sizeof(uint) * 7);
|
|
err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs[UREG_I0],
|
|
sizeof(uint) * 8);
|
|
|
|
/* Setup sigaltstack */
|
|
err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
|
|
err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
|
|
err |= __put_user(current->sas_ss_size, &uc->stack.size);
|
|
|
|
/* The register file is not saved
|
|
* we have already stuffed all of it with sync_user_stack
|
|
*/
|
|
return (err ? -EFAULT : 0);
|
|
}
|
|
|
|
/* Set the context for a svr4 application, this is Solaris way to sigreturn */
|
|
asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs)
|
|
{
|
|
svr4_gregset_t __user *gr;
|
|
unsigned long pc, npc, psr;
|
|
mm_segment_t old_fs;
|
|
sigset_t set;
|
|
svr4_sigset_t setv;
|
|
int err;
|
|
stack_t st;
|
|
|
|
/* Fixme: restore windows, or is this already taken care of in
|
|
* svr4_setup_frame when sync_user_windows is done?
|
|
*/
|
|
flush_user_windows();
|
|
|
|
if (current_thread_info()->w_saved)
|
|
goto sigsegv_and_return;
|
|
|
|
if (((unsigned long) c) & 3)
|
|
goto sigsegv_and_return;
|
|
|
|
if (!__access_ok((unsigned long)c, sizeof(*c)))
|
|
goto sigsegv_and_return;
|
|
|
|
/* Check for valid PC and nPC */
|
|
gr = &c->mcontext.greg;
|
|
err = __get_user(pc, &((*gr)[SVR4_PC]));
|
|
err |= __get_user(npc, &((*gr)[SVR4_NPC]));
|
|
|
|
if ((pc | npc) & 3)
|
|
goto sigsegv_and_return;
|
|
|
|
/* Retrieve information from passed ucontext */
|
|
/* note that nPC is ored a 1, this is used to inform entry.S */
|
|
/* that we don't want it to mess with our PC and nPC */
|
|
|
|
/* This is pretty much atomic, no amount locking would prevent
|
|
* the races which exist anyways.
|
|
*/
|
|
err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t));
|
|
|
|
err |= __get_user(st.ss_sp, &c->stack.sp);
|
|
err |= __get_user(st.ss_flags, &c->stack.flags);
|
|
err |= __get_user(st.ss_size, &c->stack.size);
|
|
|
|
if (err)
|
|
goto sigsegv_and_return;
|
|
|
|
/* 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,
|
|
regs->u_regs[UREG_I6]);
|
|
set_fs(old_fs);
|
|
|
|
set.sig[0] = setv.sigbits[0];
|
|
set.sig[1] = setv.sigbits[1];
|
|
if (_NSIG_WORDS >= 4) {
|
|
set.sig[2] = setv.sigbits[2];
|
|
set.sig[3] = setv.sigbits[3];
|
|
}
|
|
sigdelsetmask(&set, ~_BLOCKABLE);
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
current->blocked = set;
|
|
recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
regs->pc = pc;
|
|
regs->npc = npc | 1;
|
|
err |= __get_user(regs->y, &((*gr)[SVR4_Y]));
|
|
err |= __get_user(psr, &((*gr)[SVR4_PSR]));
|
|
regs->psr &= ~(PSR_ICC);
|
|
regs->psr |= (psr & PSR_ICC);
|
|
|
|
/* Restore g[1..7] and o[0..7] registers */
|
|
err |= __copy_from_user(®s->u_regs[UREG_G1], &(*gr)[SVR4_G1],
|
|
sizeof(long) * 7);
|
|
err |= __copy_from_user(®s->u_regs[UREG_I0], &(*gr)[SVR4_O0],
|
|
sizeof(long) * 8);
|
|
return (err ? -EFAULT : 0);
|
|
|
|
sigsegv_and_return:
|
|
force_sig(SIGSEGV, current);
|
|
return -EFAULT;
|
|
}
|
|
|
|
static inline void
|
|
handle_signal(unsigned long signr, struct k_sigaction *ka,
|
|
siginfo_t *info, sigset_t *oldset, struct pt_regs *regs,
|
|
int svr4_signal)
|
|
{
|
|
if (svr4_signal)
|
|
setup_svr4_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset);
|
|
else {
|
|
if (ka->sa.sa_flags & SA_SIGINFO)
|
|
new_setup_rt_frame(ka, regs, signr, oldset, info);
|
|
else if (current->thread.new_signal)
|
|
new_setup_frame(ka, regs, signr, oldset);
|
|
else
|
|
setup_frame(&ka->sa, regs, signr, oldset, info);
|
|
}
|
|
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.
|
|
*/
|
|
asmlinkage void do_signal(struct pt_regs * regs, unsigned long orig_i0, int restart_syscall)
|
|
{
|
|
siginfo_t info;
|
|
struct sparc_deliver_cookie cookie;
|
|
struct k_sigaction ka;
|
|
int signr;
|
|
sigset_t *oldset;
|
|
|
|
/*
|
|
* XXX Disable svr4 signal handling until solaris emulation works.
|
|
* It is buggy - Anton
|
|
*/
|
|
#define SVR4_SIGNAL_BROKEN 1
|
|
#ifdef SVR4_SIGNAL_BROKEN
|
|
int svr4_signal = 0;
|
|
#else
|
|
int svr4_signal = current->personality == PER_SVR4;
|
|
#endif
|
|
|
|
cookie.restart_syscall = restart_syscall;
|
|
cookie.orig_i0 = orig_i0;
|
|
|
|
if (test_thread_flag(TIF_RESTORE_SIGMASK))
|
|
oldset = ¤t->saved_sigmask;
|
|
else
|
|
oldset = ¤t->blocked;
|
|
|
|
signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
|
|
if (signr > 0) {
|
|
if (cookie.restart_syscall)
|
|
syscall_restart(cookie.orig_i0, regs, &ka.sa);
|
|
handle_signal(signr, &ka, &info, oldset,
|
|
regs, svr4_signal);
|
|
/* 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);
|
|
return;
|
|
}
|
|
if (cookie.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] = cookie.orig_i0;
|
|
regs->pc -= 4;
|
|
regs->npc -= 4;
|
|
}
|
|
if (cookie.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);
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
|
|
{
|
|
struct sparc_deliver_cookie *cp = cookie;
|
|
|
|
if (cp->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] = cp->orig_i0;
|
|
regs->pc -= 4;
|
|
regs->npc -= 4;
|
|
cp->restart_syscall = 0;
|
|
}
|
|
|
|
if (cp->restart_syscall &&
|
|
regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
|
|
regs->u_regs[UREG_G1] = __NR_restart_syscall;
|
|
regs->pc -= 4;
|
|
regs->npc -= 4;
|
|
cp->restart_syscall = 0;
|
|
}
|
|
}
|