forked from Minki/linux
dfbb83d32c
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
815 lines
23 KiB
C
815 lines
23 KiB
C
/* arch/sparc64/kernel/signal32.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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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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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/binfmts.h>
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#include <linux/compat.h>
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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/pgtable.h>
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#include <asm/psrcompat.h>
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#include <asm/fpumacro.h>
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#include <asm/visasm.h>
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#include <asm/compat_signal.h>
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#include <asm/switch_to.h>
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#include "sigutil.h"
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/* This magic should be in g_upper[0] for all upper parts
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* to be valid.
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*/
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#define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269
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typedef struct {
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unsigned int g_upper[8];
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unsigned int o_upper[8];
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unsigned int asi;
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} siginfo_extra_v8plus_t;
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struct signal_frame32 {
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struct sparc_stackf32 ss;
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__siginfo32_t info;
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/* __siginfo_fpu_t * */ u32 fpu_save;
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unsigned int insns[2];
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unsigned int extramask[_COMPAT_NSIG_WORDS - 1];
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unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
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/* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
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siginfo_extra_v8plus_t v8plus;
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/* __siginfo_rwin_t * */u32 rwin_save;
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} __attribute__((aligned(8)));
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struct rt_signal_frame32 {
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struct sparc_stackf32 ss;
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compat_siginfo_t info;
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struct pt_regs32 regs;
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compat_sigset_t mask;
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/* __siginfo_fpu_t * */ u32 fpu_save;
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unsigned int insns[2];
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compat_stack_t stack;
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unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
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/* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
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siginfo_extra_v8plus_t v8plus;
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/* __siginfo_rwin_t * */u32 rwin_save;
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} __attribute__((aligned(8)));
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int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
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{
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int err;
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if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
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return -EFAULT;
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/* If you change siginfo_t structure, please be sure
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this code is fixed accordingly.
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It should never copy any pad contained in the structure
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to avoid security leaks, but must copy the generic
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3 ints plus the relevant union member.
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This routine must convert siginfo from 64bit to 32bit as well
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at the same time. */
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err = __put_user(from->si_signo, &to->si_signo);
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err |= __put_user(from->si_errno, &to->si_errno);
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err |= __put_user((short)from->si_code, &to->si_code);
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if (from->si_code < 0)
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err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
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else {
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switch (from->si_code >> 16) {
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case __SI_TIMER >> 16:
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err |= __put_user(from->si_tid, &to->si_tid);
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err |= __put_user(from->si_overrun, &to->si_overrun);
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err |= __put_user(from->si_int, &to->si_int);
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break;
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case __SI_CHLD >> 16:
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err |= __put_user(from->si_utime, &to->si_utime);
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err |= __put_user(from->si_stime, &to->si_stime);
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err |= __put_user(from->si_status, &to->si_status);
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default:
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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break;
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case __SI_FAULT >> 16:
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err |= __put_user(from->si_trapno, &to->si_trapno);
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err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
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break;
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case __SI_POLL >> 16:
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err |= __put_user(from->si_band, &to->si_band);
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err |= __put_user(from->si_fd, &to->si_fd);
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break;
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case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
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case __SI_MESGQ >> 16:
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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err |= __put_user(from->si_int, &to->si_int);
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break;
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}
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}
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return err;
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}
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/* CAUTION: This is just a very minimalist implementation for the
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* sake of compat_sys_rt_sigqueueinfo()
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*/
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int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
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{
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if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t)))
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return -EFAULT;
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if (copy_from_user(to, from, 3*sizeof(int)) ||
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copy_from_user(to->_sifields._pad, from->_sifields._pad,
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SI_PAD_SIZE))
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return -EFAULT;
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return 0;
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}
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void do_sigreturn32(struct pt_regs *regs)
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{
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struct signal_frame32 __user *sf;
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compat_uptr_t fpu_save;
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compat_uptr_t rwin_save;
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unsigned int psr;
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unsigned pc, npc;
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sigset_t set;
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unsigned seta[_COMPAT_NSIG_WORDS];
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int err, i;
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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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regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
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sf = (struct signal_frame32 __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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(((unsigned long) sf) & 3))
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goto segv;
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if (get_user(pc, &sf->info.si_regs.pc) ||
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__get_user(npc, &sf->info.si_regs.npc))
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goto segv;
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if ((pc | npc) & 3)
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goto segv;
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if (test_thread_flag(TIF_32BIT)) {
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pc &= 0xffffffff;
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npc &= 0xffffffff;
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}
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regs->tpc = pc;
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regs->tnpc = npc;
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/* 2. Restore the state */
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err = __get_user(regs->y, &sf->info.si_regs.y);
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err |= __get_user(psr, &sf->info.si_regs.psr);
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for (i = UREG_G1; i <= UREG_I7; i++)
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err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
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if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
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err |= __get_user(i, &sf->v8plus.g_upper[0]);
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if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
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unsigned long asi;
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for (i = UREG_G1; i <= UREG_I7; i++)
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err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
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err |= __get_user(asi, &sf->v8plus.asi);
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regs->tstate &= ~TSTATE_ASI;
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regs->tstate |= ((asi & 0xffUL) << 24UL);
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}
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}
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/* User can only change condition codes in %tstate. */
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regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
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regs->tstate |= psr_to_tstate_icc(psr);
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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 (!err && fpu_save)
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err |= restore_fpu_state(regs, compat_ptr(fpu_save));
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err |= __get_user(rwin_save, &sf->rwin_save);
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if (!err && rwin_save) {
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if (restore_rwin_state(compat_ptr(rwin_save)))
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goto segv;
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}
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err |= __get_user(seta[0], &sf->info.si_mask);
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err |= copy_from_user(seta+1, &sf->extramask,
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(_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
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if (err)
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goto segv;
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switch (_NSIG_WORDS) {
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case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32);
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case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32);
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case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32);
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case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32);
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}
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set_current_blocked(&set);
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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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asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
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{
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struct rt_signal_frame32 __user *sf;
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unsigned int psr, pc, npc;
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compat_uptr_t fpu_save;
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compat_uptr_t rwin_save;
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sigset_t set;
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compat_sigset_t seta;
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int err, i;
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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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regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
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sf = (struct rt_signal_frame32 __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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(((unsigned long) sf) & 3))
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goto segv;
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if (get_user(pc, &sf->regs.pc) ||
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__get_user(npc, &sf->regs.npc))
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goto segv;
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if ((pc | npc) & 3)
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goto segv;
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if (test_thread_flag(TIF_32BIT)) {
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pc &= 0xffffffff;
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npc &= 0xffffffff;
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}
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regs->tpc = pc;
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regs->tnpc = npc;
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/* 2. Restore the state */
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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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for (i = UREG_G1; i <= UREG_I7; i++)
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err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
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if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
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err |= __get_user(i, &sf->v8plus.g_upper[0]);
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if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
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unsigned long asi;
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for (i = UREG_G1; i <= UREG_I7; i++)
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err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
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err |= __get_user(asi, &sf->v8plus.asi);
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regs->tstate &= ~TSTATE_ASI;
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regs->tstate |= ((asi & 0xffUL) << 24UL);
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}
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}
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/* User can only change condition codes in %tstate. */
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regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
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regs->tstate |= psr_to_tstate_icc(psr);
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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 (!err && fpu_save)
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err |= restore_fpu_state(regs, compat_ptr(fpu_save));
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err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t));
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err |= compat_restore_altstack(&sf->stack);
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if (err)
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goto segv;
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err |= __get_user(rwin_save, &sf->rwin_save);
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if (!err && rwin_save) {
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if (restore_rwin_state(compat_ptr(rwin_save)))
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goto segv;
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}
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switch (_NSIG_WORDS) {
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case 4: set.sig[3] = seta.sig[6] + (((long)seta.sig[7]) << 32);
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case 3: set.sig[2] = seta.sig[4] + (((long)seta.sig[5]) << 32);
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case 2: set.sig[1] = seta.sig[2] + (((long)seta.sig[3]) << 32);
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case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
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}
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set_current_blocked(&set);
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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 int invalid_frame_pointer(void __user *fp, int fplen)
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{
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if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen)
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return 1;
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return 0;
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}
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static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
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{
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unsigned long sp;
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regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
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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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sp = sigsp(sp, ksig) - 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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/* The I-cache flush instruction only works in the primary ASI, which
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* right now is the nucleus, aka. kernel space.
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*
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* Therefore we have to kick the instructions out using the kernel
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* side linear mapping of the physical address backing the user
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* instructions.
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*/
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static void flush_signal_insns(unsigned long address)
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{
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unsigned long pstate, paddr;
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pte_t *ptep, pte;
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pgd_t *pgdp;
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pud_t *pudp;
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pmd_t *pmdp;
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/* Commit all stores of the instructions we are about to flush. */
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wmb();
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|
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/* Disable cross-call reception. In this way even a very wide
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* munmap() on another cpu can't tear down the page table
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* hierarchy from underneath us, since that can't complete
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* until the IPI tlb flush returns.
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*/
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__asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
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__asm__ __volatile__("wrpr %0, %1, %%pstate"
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: : "r" (pstate), "i" (PSTATE_IE));
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pgdp = pgd_offset(current->mm, address);
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if (pgd_none(*pgdp))
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goto out_irqs_on;
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pudp = pud_offset(pgdp, address);
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if (pud_none(*pudp))
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goto out_irqs_on;
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pmdp = pmd_offset(pudp, address);
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if (pmd_none(*pmdp))
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goto out_irqs_on;
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|
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ptep = pte_offset_map(pmdp, address);
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pte = *ptep;
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if (!pte_present(pte))
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goto out_unmap;
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paddr = (unsigned long) page_address(pte_page(pte));
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|
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__asm__ __volatile__("flush %0 + %1"
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: /* no outputs */
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: "r" (paddr),
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"r" (address & (PAGE_SIZE - 1))
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: "memory");
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|
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out_unmap:
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pte_unmap(ptep);
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out_irqs_on:
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__asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
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|
|
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}
|
|
|
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static int setup_frame32(struct ksignal *ksig, struct pt_regs *regs,
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sigset_t *oldset)
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{
|
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struct signal_frame32 __user *sf;
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int i, err, wsaved;
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void __user *tail;
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int sigframe_size;
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u32 psr;
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unsigned int seta[_COMPAT_NSIG_WORDS];
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|
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/* 1. Make sure everything is clean */
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synchronize_user_stack();
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save_and_clear_fpu();
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|
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wsaved = get_thread_wsaved();
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|
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sigframe_size = sizeof(*sf);
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if (current_thread_info()->fpsaved[0] & FPRS_FEF)
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sigframe_size += sizeof(__siginfo_fpu_t);
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if (wsaved)
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sigframe_size += sizeof(__siginfo_rwin_t);
|
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|
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sf = (struct signal_frame32 __user *)
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get_sigframe(ksig, regs, sigframe_size);
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|
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if (invalid_frame_pointer(sf, sigframe_size)) {
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do_exit(SIGILL);
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return -EINVAL;
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}
|
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|
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tail = (sf + 1);
|
|
|
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/* 2. Save the current process state */
|
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if (test_thread_flag(TIF_32BIT)) {
|
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regs->tpc &= 0xffffffff;
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regs->tnpc &= 0xffffffff;
|
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}
|
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err = put_user(regs->tpc, &sf->info.si_regs.pc);
|
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err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
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err |= __put_user(regs->y, &sf->info.si_regs.y);
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psr = tstate_to_psr(regs->tstate);
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if (current_thread_info()->fpsaved[0] & FPRS_FEF)
|
|
psr |= PSR_EF;
|
|
err |= __put_user(psr, &sf->info.si_regs.psr);
|
|
for (i = 0; i < 16; i++)
|
|
err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
|
|
err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
|
|
err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
|
|
for (i = 1; i < 16; i++)
|
|
err |= __put_user(((u32 *)regs->u_regs)[2*i],
|
|
&sf->v8plus.g_upper[i]);
|
|
err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
|
|
&sf->v8plus.asi);
|
|
|
|
if (psr & PSR_EF) {
|
|
__siginfo_fpu_t __user *fp = tail;
|
|
tail += sizeof(*fp);
|
|
err |= save_fpu_state(regs, fp);
|
|
err |= __put_user((u64)fp, &sf->fpu_save);
|
|
} else {
|
|
err |= __put_user(0, &sf->fpu_save);
|
|
}
|
|
if (wsaved) {
|
|
__siginfo_rwin_t __user *rwp = tail;
|
|
tail += sizeof(*rwp);
|
|
err |= save_rwin_state(wsaved, rwp);
|
|
err |= __put_user((u64)rwp, &sf->rwin_save);
|
|
set_thread_wsaved(0);
|
|
} else {
|
|
err |= __put_user(0, &sf->rwin_save);
|
|
}
|
|
|
|
switch (_NSIG_WORDS) {
|
|
case 4: seta[7] = (oldset->sig[3] >> 32);
|
|
seta[6] = oldset->sig[3];
|
|
case 3: seta[5] = (oldset->sig[2] >> 32);
|
|
seta[4] = oldset->sig[2];
|
|
case 2: seta[3] = (oldset->sig[1] >> 32);
|
|
seta[2] = oldset->sig[1];
|
|
case 1: seta[1] = (oldset->sig[0] >> 32);
|
|
seta[0] = oldset->sig[0];
|
|
}
|
|
err |= __put_user(seta[0], &sf->info.si_mask);
|
|
err |= __copy_to_user(sf->extramask, seta + 1,
|
|
(_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
|
|
|
|
if (!wsaved) {
|
|
err |= copy_in_user((u32 __user *)sf,
|
|
(u32 __user *)(regs->u_regs[UREG_FP]),
|
|
sizeof(struct reg_window32));
|
|
} else {
|
|
struct reg_window *rp;
|
|
|
|
rp = ¤t_thread_info()->reg_window[wsaved - 1];
|
|
for (i = 0; i < 8; i++)
|
|
err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
|
|
for (i = 0; i < 6; i++)
|
|
err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
|
|
err |= __put_user(rp->ins[6], &sf->ss.fp);
|
|
err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
|
|
}
|
|
if (err)
|
|
return err;
|
|
|
|
/* 3. signal handler back-trampoline and parameters */
|
|
regs->u_regs[UREG_FP] = (unsigned long) sf;
|
|
regs->u_regs[UREG_I0] = ksig->sig;
|
|
regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
|
|
regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
|
|
|
|
/* 4. signal handler */
|
|
regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
|
|
regs->tnpc = (regs->tpc + 4);
|
|
if (test_thread_flag(TIF_32BIT)) {
|
|
regs->tpc &= 0xffffffff;
|
|
regs->tnpc &= 0xffffffff;
|
|
}
|
|
|
|
/* 5. return to kernel instructions */
|
|
if (ksig->ka.ka_restorer) {
|
|
regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
|
|
} else {
|
|
unsigned long address = ((unsigned long)&(sf->insns[0]));
|
|
|
|
regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
|
|
|
|
err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
|
|
err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
|
|
if (err)
|
|
return err;
|
|
flush_signal_insns(address);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs,
|
|
sigset_t *oldset)
|
|
{
|
|
struct rt_signal_frame32 __user *sf;
|
|
int i, err, wsaved;
|
|
void __user *tail;
|
|
int sigframe_size;
|
|
u32 psr;
|
|
compat_sigset_t seta;
|
|
|
|
/* 1. Make sure everything is clean */
|
|
synchronize_user_stack();
|
|
save_and_clear_fpu();
|
|
|
|
wsaved = get_thread_wsaved();
|
|
|
|
sigframe_size = sizeof(*sf);
|
|
if (current_thread_info()->fpsaved[0] & FPRS_FEF)
|
|
sigframe_size += sizeof(__siginfo_fpu_t);
|
|
if (wsaved)
|
|
sigframe_size += sizeof(__siginfo_rwin_t);
|
|
|
|
sf = (struct rt_signal_frame32 __user *)
|
|
get_sigframe(ksig, regs, sigframe_size);
|
|
|
|
if (invalid_frame_pointer(sf, sigframe_size)) {
|
|
do_exit(SIGILL);
|
|
return -EINVAL;
|
|
}
|
|
|
|
tail = (sf + 1);
|
|
|
|
/* 2. Save the current process state */
|
|
if (test_thread_flag(TIF_32BIT)) {
|
|
regs->tpc &= 0xffffffff;
|
|
regs->tnpc &= 0xffffffff;
|
|
}
|
|
err = put_user(regs->tpc, &sf->regs.pc);
|
|
err |= __put_user(regs->tnpc, &sf->regs.npc);
|
|
err |= __put_user(regs->y, &sf->regs.y);
|
|
psr = tstate_to_psr(regs->tstate);
|
|
if (current_thread_info()->fpsaved[0] & FPRS_FEF)
|
|
psr |= PSR_EF;
|
|
err |= __put_user(psr, &sf->regs.psr);
|
|
for (i = 0; i < 16; i++)
|
|
err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
|
|
err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
|
|
err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
|
|
for (i = 1; i < 16; i++)
|
|
err |= __put_user(((u32 *)regs->u_regs)[2*i],
|
|
&sf->v8plus.g_upper[i]);
|
|
err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
|
|
&sf->v8plus.asi);
|
|
|
|
if (psr & PSR_EF) {
|
|
__siginfo_fpu_t __user *fp = tail;
|
|
tail += sizeof(*fp);
|
|
err |= save_fpu_state(regs, fp);
|
|
err |= __put_user((u64)fp, &sf->fpu_save);
|
|
} else {
|
|
err |= __put_user(0, &sf->fpu_save);
|
|
}
|
|
if (wsaved) {
|
|
__siginfo_rwin_t __user *rwp = tail;
|
|
tail += sizeof(*rwp);
|
|
err |= save_rwin_state(wsaved, rwp);
|
|
err |= __put_user((u64)rwp, &sf->rwin_save);
|
|
set_thread_wsaved(0);
|
|
} else {
|
|
err |= __put_user(0, &sf->rwin_save);
|
|
}
|
|
|
|
/* Update the siginfo structure. */
|
|
err |= copy_siginfo_to_user32(&sf->info, &ksig->info);
|
|
|
|
/* Setup sigaltstack */
|
|
err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
|
|
|
|
switch (_NSIG_WORDS) {
|
|
case 4: seta.sig[7] = (oldset->sig[3] >> 32);
|
|
seta.sig[6] = oldset->sig[3];
|
|
case 3: seta.sig[5] = (oldset->sig[2] >> 32);
|
|
seta.sig[4] = oldset->sig[2];
|
|
case 2: seta.sig[3] = (oldset->sig[1] >> 32);
|
|
seta.sig[2] = oldset->sig[1];
|
|
case 1: seta.sig[1] = (oldset->sig[0] >> 32);
|
|
seta.sig[0] = oldset->sig[0];
|
|
}
|
|
err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t));
|
|
|
|
if (!wsaved) {
|
|
err |= copy_in_user((u32 __user *)sf,
|
|
(u32 __user *)(regs->u_regs[UREG_FP]),
|
|
sizeof(struct reg_window32));
|
|
} else {
|
|
struct reg_window *rp;
|
|
|
|
rp = ¤t_thread_info()->reg_window[wsaved - 1];
|
|
for (i = 0; i < 8; i++)
|
|
err |= __put_user(rp->locals[i], &sf->ss.locals[i]);
|
|
for (i = 0; i < 6; i++)
|
|
err |= __put_user(rp->ins[i], &sf->ss.ins[i]);
|
|
err |= __put_user(rp->ins[6], &sf->ss.fp);
|
|
err |= __put_user(rp->ins[7], &sf->ss.callers_pc);
|
|
}
|
|
if (err)
|
|
return err;
|
|
|
|
/* 3. signal handler back-trampoline and parameters */
|
|
regs->u_regs[UREG_FP] = (unsigned long) sf;
|
|
regs->u_regs[UREG_I0] = ksig->sig;
|
|
regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
|
|
regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
|
|
|
|
/* 4. signal handler */
|
|
regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
|
|
regs->tnpc = (regs->tpc + 4);
|
|
if (test_thread_flag(TIF_32BIT)) {
|
|
regs->tpc &= 0xffffffff;
|
|
regs->tnpc &= 0xffffffff;
|
|
}
|
|
|
|
/* 5. return to kernel instructions */
|
|
if (ksig->ka.ka_restorer)
|
|
regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
|
|
else {
|
|
unsigned long address = ((unsigned long)&(sf->insns[0]));
|
|
|
|
regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
|
|
|
|
/* mov __NR_rt_sigreturn, %g1 */
|
|
err |= __put_user(0x82102065, &sf->insns[0]);
|
|
|
|
/* t 0x10 */
|
|
err |= __put_user(0x91d02010, &sf->insns[1]);
|
|
if (err)
|
|
return err;
|
|
|
|
flush_signal_insns(address);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline void handle_signal32(struct ksignal *ksig,
|
|
struct pt_regs *regs)
|
|
{
|
|
sigset_t *oldset = sigmask_to_save();
|
|
int err;
|
|
|
|
if (ksig->ka.sa.sa_flags & SA_SIGINFO)
|
|
err = setup_rt_frame32(ksig, regs, oldset);
|
|
else
|
|
err = setup_frame32(ksig, regs, oldset);
|
|
|
|
signal_setup_done(err, ksig, 0);
|
|
}
|
|
|
|
static inline void syscall_restart32(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->tstate |= TSTATE_ICARRY;
|
|
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->tpc -= 4;
|
|
regs->tnpc -= 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.
|
|
*/
|
|
void do_signal32(struct pt_regs * regs)
|
|
{
|
|
struct ksignal ksig;
|
|
unsigned long orig_i0 = 0;
|
|
int restart_syscall = 0;
|
|
bool has_handler = get_signal(&ksig);
|
|
|
|
if (pt_regs_is_syscall(regs) &&
|
|
(regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
|
|
restart_syscall = 1;
|
|
orig_i0 = regs->u_regs[UREG_G6];
|
|
}
|
|
|
|
if (has_handler) {
|
|
if (restart_syscall)
|
|
syscall_restart32(orig_i0, regs, &ksig.ka.sa);
|
|
handle_signal32(&ksig, regs);
|
|
} else {
|
|
if (restart_syscall) {
|
|
switch (regs->u_regs[UREG_I0]) {
|
|
case ERESTARTNOHAND:
|
|
case ERESTARTSYS:
|
|
case ERESTARTNOINTR:
|
|
/* replay the system call when we are done */
|
|
regs->u_regs[UREG_I0] = orig_i0;
|
|
regs->tpc -= 4;
|
|
regs->tnpc -= 4;
|
|
pt_regs_clear_syscall(regs);
|
|
case ERESTART_RESTARTBLOCK:
|
|
regs->u_regs[UREG_G1] = __NR_restart_syscall;
|
|
regs->tpc -= 4;
|
|
regs->tnpc -= 4;
|
|
pt_regs_clear_syscall(regs);
|
|
}
|
|
}
|
|
restore_saved_sigmask();
|
|
}
|
|
}
|
|
|
|
struct sigstack32 {
|
|
u32 the_stack;
|
|
int cur_status;
|
|
};
|
|
|
|
asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
|
|
{
|
|
struct sigstack32 __user *ssptr =
|
|
(struct sigstack32 __user *)((unsigned long)(u_ssptr));
|
|
struct sigstack32 __user *ossptr =
|
|
(struct sigstack32 __user *)((unsigned long)(u_ossptr));
|
|
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) {
|
|
u32 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;
|
|
}
|