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290 lines
7.3 KiB
290 lines
7.3 KiB
/* |
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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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