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149 lines
3.8 KiB
149 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2003 Broadcom Corporation |
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*/ |
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#include <linux/cache.h> |
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#include <linux/sched.h> |
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#include <linux/mm.h> |
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#include <linux/smp.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/compat.h> |
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#include <linux/bitops.h> |
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#include <asm/abi.h> |
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#include <asm/asm.h> |
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#include <asm/cacheflush.h> |
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#include <asm/compat-signal.h> |
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#include <asm/sim.h> |
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#include <linux/uaccess.h> |
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#include <asm/ucontext.h> |
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#include <asm/fpu.h> |
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#include <asm/cpu-features.h> |
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#include <asm/war.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_N32_restart_syscall 6214 |
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extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *); |
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extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *); |
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struct ucontextn32 { |
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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 sigcontext 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_sigframe_n32 { |
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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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struct compat_siginfo rs_info; |
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struct ucontextn32 rs_uc; |
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}; |
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asmlinkage void sysn32_rt_sigreturn(void) |
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{ |
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struct rt_sigframe_n32 __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_sigframe_n32 __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_sigcontext(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_n32(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_sigframe_n32 __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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/* Create siginfo. */ |
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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_sigcontext(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_sigframe. |
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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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struct mips_abi mips_abi_n32 = { |
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.setup_rt_frame = setup_rt_frame_n32, |
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.restart = __NR_N32_restart_syscall, |
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.off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs), |
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.off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr), |
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.off_sc_used_math = offsetof(struct sigcontext, sc_used_math), |
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.vdso = &vdso_image_n32, |
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};
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