291 lines
7.3 KiB
C
291 lines
7.3 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1994 - 2000, 2006 Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2016, Imagination Technologies Ltd.
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*/
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#include <linux/compiler.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/sched/signal.h>
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#include <linux/uaccess.h>
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#include <asm/abi.h>
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#include <asm/compat-signal.h>
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#include <asm/dsp.h>
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#include <asm/sim.h>
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#include <asm/unistd.h>
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#include "signal-common.h"
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/*
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* Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
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*/
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#define __NR_O32_restart_syscall 4253
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struct sigframe32 {
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u32 sf_ass[4]; /* argument save space for o32 */
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u32 sf_pad[2]; /* Was: signal trampoline */
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struct sigcontext32 sf_sc;
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compat_sigset_t sf_mask;
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};
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struct ucontext32 {
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u32 uc_flags;
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s32 uc_link;
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compat_stack_t uc_stack;
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struct sigcontext32 uc_mcontext;
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compat_sigset_t uc_sigmask; /* mask last for extensibility */
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};
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struct rt_sigframe32 {
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u32 rs_ass[4]; /* argument save space for o32 */
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u32 rs_pad[2]; /* Was: signal trampoline */
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compat_siginfo_t rs_info;
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struct ucontext32 rs_uc;
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};
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static int setup_sigcontext32(struct pt_regs *regs,
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struct sigcontext32 __user *sc)
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{
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int err = 0;
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int i;
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err |= __put_user(regs->cp0_epc, &sc->sc_pc);
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err |= __put_user(0, &sc->sc_regs[0]);
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for (i = 1; i < 32; i++)
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err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
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err |= __put_user(regs->hi, &sc->sc_mdhi);
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err |= __put_user(regs->lo, &sc->sc_mdlo);
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if (cpu_has_dsp) {
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err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
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err |= __put_user(mfhi1(), &sc->sc_hi1);
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err |= __put_user(mflo1(), &sc->sc_lo1);
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err |= __put_user(mfhi2(), &sc->sc_hi2);
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err |= __put_user(mflo2(), &sc->sc_lo2);
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err |= __put_user(mfhi3(), &sc->sc_hi3);
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err |= __put_user(mflo3(), &sc->sc_lo3);
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}
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/*
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* Save FPU state to signal context. Signal handler
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* will "inherit" current FPU state.
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*/
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err |= protected_save_fp_context(sc);
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return err;
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}
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static int restore_sigcontext32(struct pt_regs *regs,
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struct sigcontext32 __user *sc)
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{
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int err = 0;
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s32 treg;
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int i;
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/* Always make any pending restarted system calls return -EINTR */
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current->restart_block.fn = do_no_restart_syscall;
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err |= __get_user(regs->cp0_epc, &sc->sc_pc);
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err |= __get_user(regs->hi, &sc->sc_mdhi);
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err |= __get_user(regs->lo, &sc->sc_mdlo);
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if (cpu_has_dsp) {
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err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
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err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
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err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
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err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
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err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
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err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
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err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
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}
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for (i = 1; i < 32; i++)
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err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
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return err ?: protected_restore_fp_context(sc);
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}
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static int setup_frame_32(void *sig_return, struct ksignal *ksig,
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struct pt_regs *regs, sigset_t *set)
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{
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struct sigframe32 __user *frame;
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int err = 0;
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frame = get_sigframe(ksig, regs, sizeof(*frame));
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if (!access_ok(frame, sizeof (*frame)))
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return -EFAULT;
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err |= setup_sigcontext32(regs, &frame->sf_sc);
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err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);
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if (err)
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return -EFAULT;
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/*
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* Arguments to signal handler:
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*
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* a0 = signal number
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* a1 = 0 (should be cause)
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* a2 = pointer to struct sigcontext
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*
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* $25 and c0_epc point to the signal handler, $29 points to the
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* struct sigframe.
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*/
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regs->regs[ 4] = ksig->sig;
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regs->regs[ 5] = 0;
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regs->regs[ 6] = (unsigned long) &frame->sf_sc;
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regs->regs[29] = (unsigned long) frame;
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regs->regs[31] = (unsigned long) sig_return;
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regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
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DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
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current->comm, current->pid,
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frame, regs->cp0_epc, regs->regs[31]);
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return 0;
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}
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asmlinkage void sys32_rt_sigreturn(void)
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{
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struct rt_sigframe32 __user *frame;
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struct pt_regs *regs;
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sigset_t set;
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int sig;
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regs = current_pt_regs();
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frame = (struct rt_sigframe32 __user *)regs->regs[29];
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if (!access_ok(frame, sizeof(*frame)))
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goto badframe;
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if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
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goto badframe;
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set_current_blocked(&set);
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sig = restore_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
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if (sig < 0)
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goto badframe;
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else if (sig)
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force_sig(sig);
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if (compat_restore_altstack(&frame->rs_uc.uc_stack))
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goto badframe;
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/*
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* Don't let your children do this ...
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*/
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__asm__ __volatile__(
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"move\t$29, %0\n\t"
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"j\tsyscall_exit"
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: /* no outputs */
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: "r" (regs));
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/* Unreached */
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badframe:
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force_sig(SIGSEGV);
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}
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static int setup_rt_frame_32(void *sig_return, struct ksignal *ksig,
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struct pt_regs *regs, sigset_t *set)
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{
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struct rt_sigframe32 __user *frame;
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int err = 0;
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frame = get_sigframe(ksig, regs, sizeof(*frame));
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if (!access_ok(frame, sizeof (*frame)))
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return -EFAULT;
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/* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
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err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
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/* Create the ucontext. */
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err |= __put_user(0, &frame->rs_uc.uc_flags);
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err |= __put_user(0, &frame->rs_uc.uc_link);
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err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
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err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
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err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
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if (err)
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return -EFAULT;
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/*
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* Arguments to signal handler:
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*
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* a0 = signal number
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* a1 = 0 (should be cause)
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* a2 = pointer to ucontext
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*
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* $25 and c0_epc point to the signal handler, $29 points to
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* the struct rt_sigframe32.
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*/
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regs->regs[ 4] = ksig->sig;
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regs->regs[ 5] = (unsigned long) &frame->rs_info;
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regs->regs[ 6] = (unsigned long) &frame->rs_uc;
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regs->regs[29] = (unsigned long) frame;
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regs->regs[31] = (unsigned long) sig_return;
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regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
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DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
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current->comm, current->pid,
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frame, regs->cp0_epc, regs->regs[31]);
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return 0;
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}
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/*
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* o32 compatibility on 64-bit kernels, without DSP ASE
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*/
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struct mips_abi mips_abi_32 = {
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.setup_frame = setup_frame_32,
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.setup_rt_frame = setup_rt_frame_32,
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.restart = __NR_O32_restart_syscall,
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.off_sc_fpregs = offsetof(struct sigcontext32, sc_fpregs),
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.off_sc_fpc_csr = offsetof(struct sigcontext32, sc_fpc_csr),
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.off_sc_used_math = offsetof(struct sigcontext32, sc_used_math),
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.vdso = &vdso_image_o32,
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};
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asmlinkage void sys32_sigreturn(void)
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{
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struct sigframe32 __user *frame;
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struct pt_regs *regs;
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sigset_t blocked;
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int sig;
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regs = current_pt_regs();
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frame = (struct sigframe32 __user *)regs->regs[29];
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if (!access_ok(frame, sizeof(*frame)))
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goto badframe;
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if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))
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goto badframe;
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set_current_blocked(&blocked);
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sig = restore_sigcontext32(regs, &frame->sf_sc);
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if (sig < 0)
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goto badframe;
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else if (sig)
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force_sig(sig);
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/*
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* Don't let your children do this ...
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*/
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__asm__ __volatile__(
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"move\t$29, %0\n\t"
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"j\tsyscall_exit"
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: /* no outputs */
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: "r" (regs));
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/* Unreached */
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badframe:
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force_sig(SIGSEGV);
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}
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