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384 lines
12 KiB
384 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (C) 2005-2017 Andes Technology Corporation |
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#include <linux/errno.h> |
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#include <linux/signal.h> |
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#include <linux/ptrace.h> |
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#include <linux/personality.h> |
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#include <linux/freezer.h> |
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#include <linux/tracehook.h> |
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#include <linux/uaccess.h> |
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#include <asm/cacheflush.h> |
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#include <asm/ucontext.h> |
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#include <asm/unistd.h> |
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#include <asm/fpu.h> |
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#include <asm/ptrace.h> |
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#include <asm/vdso.h> |
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struct rt_sigframe { |
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struct siginfo info; |
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struct ucontext uc; |
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}; |
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#if IS_ENABLED(CONFIG_FPU) |
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static inline int restore_sigcontext_fpu(struct pt_regs *regs, |
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struct sigcontext __user *sc) |
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{ |
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struct task_struct *tsk = current; |
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unsigned long used_math_flag; |
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int ret = 0; |
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clear_used_math(); |
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__get_user_error(used_math_flag, &sc->used_math_flag, ret); |
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if (!used_math_flag) |
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return 0; |
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set_used_math(); |
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#if IS_ENABLED(CONFIG_LAZY_FPU) |
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preempt_disable(); |
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if (current == last_task_used_math) { |
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last_task_used_math = NULL; |
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disable_ptreg_fpu(regs); |
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} |
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preempt_enable(); |
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#else |
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clear_fpu(regs); |
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#endif |
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return __copy_from_user(&tsk->thread.fpu, &sc->fpu, |
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sizeof(struct fpu_struct)); |
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} |
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static inline int setup_sigcontext_fpu(struct pt_regs *regs, |
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struct sigcontext __user *sc) |
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{ |
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struct task_struct *tsk = current; |
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int ret = 0; |
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__put_user_error(used_math(), &sc->used_math_flag, ret); |
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if (!used_math()) |
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return ret; |
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preempt_disable(); |
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#if IS_ENABLED(CONFIG_LAZY_FPU) |
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if (last_task_used_math == tsk) |
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save_fpu(last_task_used_math); |
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#else |
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unlazy_fpu(tsk); |
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#endif |
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ret = __copy_to_user(&sc->fpu, &tsk->thread.fpu, |
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sizeof(struct fpu_struct)); |
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preempt_enable(); |
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return ret; |
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} |
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#endif |
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static int restore_sigframe(struct pt_regs *regs, |
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struct rt_sigframe __user * sf) |
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{ |
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sigset_t set; |
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int err; |
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err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set)); |
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if (err == 0) { |
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set_current_blocked(&set); |
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} |
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__get_user_error(regs->uregs[0], &sf->uc.uc_mcontext.nds32_r0, err); |
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__get_user_error(regs->uregs[1], &sf->uc.uc_mcontext.nds32_r1, err); |
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__get_user_error(regs->uregs[2], &sf->uc.uc_mcontext.nds32_r2, err); |
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__get_user_error(regs->uregs[3], &sf->uc.uc_mcontext.nds32_r3, err); |
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__get_user_error(regs->uregs[4], &sf->uc.uc_mcontext.nds32_r4, err); |
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__get_user_error(regs->uregs[5], &sf->uc.uc_mcontext.nds32_r5, err); |
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__get_user_error(regs->uregs[6], &sf->uc.uc_mcontext.nds32_r6, err); |
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__get_user_error(regs->uregs[7], &sf->uc.uc_mcontext.nds32_r7, err); |
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__get_user_error(regs->uregs[8], &sf->uc.uc_mcontext.nds32_r8, err); |
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__get_user_error(regs->uregs[9], &sf->uc.uc_mcontext.nds32_r9, err); |
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__get_user_error(regs->uregs[10], &sf->uc.uc_mcontext.nds32_r10, err); |
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__get_user_error(regs->uregs[11], &sf->uc.uc_mcontext.nds32_r11, err); |
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__get_user_error(regs->uregs[12], &sf->uc.uc_mcontext.nds32_r12, err); |
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__get_user_error(regs->uregs[13], &sf->uc.uc_mcontext.nds32_r13, err); |
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__get_user_error(regs->uregs[14], &sf->uc.uc_mcontext.nds32_r14, err); |
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__get_user_error(regs->uregs[15], &sf->uc.uc_mcontext.nds32_r15, err); |
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__get_user_error(regs->uregs[16], &sf->uc.uc_mcontext.nds32_r16, err); |
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__get_user_error(regs->uregs[17], &sf->uc.uc_mcontext.nds32_r17, err); |
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__get_user_error(regs->uregs[18], &sf->uc.uc_mcontext.nds32_r18, err); |
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__get_user_error(regs->uregs[19], &sf->uc.uc_mcontext.nds32_r19, err); |
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__get_user_error(regs->uregs[20], &sf->uc.uc_mcontext.nds32_r20, err); |
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__get_user_error(regs->uregs[21], &sf->uc.uc_mcontext.nds32_r21, err); |
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__get_user_error(regs->uregs[22], &sf->uc.uc_mcontext.nds32_r22, err); |
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__get_user_error(regs->uregs[23], &sf->uc.uc_mcontext.nds32_r23, err); |
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__get_user_error(regs->uregs[24], &sf->uc.uc_mcontext.nds32_r24, err); |
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__get_user_error(regs->uregs[25], &sf->uc.uc_mcontext.nds32_r25, err); |
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__get_user_error(regs->fp, &sf->uc.uc_mcontext.nds32_fp, err); |
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__get_user_error(regs->gp, &sf->uc.uc_mcontext.nds32_gp, err); |
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__get_user_error(regs->lp, &sf->uc.uc_mcontext.nds32_lp, err); |
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__get_user_error(regs->sp, &sf->uc.uc_mcontext.nds32_sp, err); |
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__get_user_error(regs->ipc, &sf->uc.uc_mcontext.nds32_ipc, err); |
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#if defined(CONFIG_HWZOL) |
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__get_user_error(regs->lc, &sf->uc.uc_mcontext.zol.nds32_lc, err); |
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__get_user_error(regs->le, &sf->uc.uc_mcontext.zol.nds32_le, err); |
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__get_user_error(regs->lb, &sf->uc.uc_mcontext.zol.nds32_lb, err); |
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#endif |
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#if IS_ENABLED(CONFIG_FPU) |
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err |= restore_sigcontext_fpu(regs, &sf->uc.uc_mcontext); |
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#endif |
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/* |
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* Avoid sys_rt_sigreturn() restarting. |
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*/ |
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forget_syscall(regs); |
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return err; |
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} |
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asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) |
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{ |
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struct rt_sigframe __user *frame; |
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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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/* |
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* Since we stacked the signal on a 64-bit boundary, |
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* then 'sp' should be two-word aligned here. If it's |
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* not, then the user is trying to mess with us. |
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*/ |
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if (regs->sp & 7) |
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goto badframe; |
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frame = (struct rt_sigframe __user *)regs->sp; |
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if (!access_ok(frame, sizeof(*frame))) |
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goto badframe; |
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if (restore_sigframe(regs, frame)) |
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goto badframe; |
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if (restore_altstack(&frame->uc.uc_stack)) |
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goto badframe; |
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return regs->uregs[0]; |
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badframe: |
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force_sig(SIGSEGV); |
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return 0; |
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} |
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static int |
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setup_sigframe(struct rt_sigframe __user * sf, struct pt_regs *regs, |
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sigset_t * set) |
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{ |
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int err = 0; |
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__put_user_error(regs->uregs[0], &sf->uc.uc_mcontext.nds32_r0, err); |
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__put_user_error(regs->uregs[1], &sf->uc.uc_mcontext.nds32_r1, err); |
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__put_user_error(regs->uregs[2], &sf->uc.uc_mcontext.nds32_r2, err); |
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__put_user_error(regs->uregs[3], &sf->uc.uc_mcontext.nds32_r3, err); |
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__put_user_error(regs->uregs[4], &sf->uc.uc_mcontext.nds32_r4, err); |
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__put_user_error(regs->uregs[5], &sf->uc.uc_mcontext.nds32_r5, err); |
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__put_user_error(regs->uregs[6], &sf->uc.uc_mcontext.nds32_r6, err); |
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__put_user_error(regs->uregs[7], &sf->uc.uc_mcontext.nds32_r7, err); |
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__put_user_error(regs->uregs[8], &sf->uc.uc_mcontext.nds32_r8, err); |
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__put_user_error(regs->uregs[9], &sf->uc.uc_mcontext.nds32_r9, err); |
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__put_user_error(regs->uregs[10], &sf->uc.uc_mcontext.nds32_r10, err); |
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__put_user_error(regs->uregs[11], &sf->uc.uc_mcontext.nds32_r11, err); |
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__put_user_error(regs->uregs[12], &sf->uc.uc_mcontext.nds32_r12, err); |
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__put_user_error(regs->uregs[13], &sf->uc.uc_mcontext.nds32_r13, err); |
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__put_user_error(regs->uregs[14], &sf->uc.uc_mcontext.nds32_r14, err); |
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__put_user_error(regs->uregs[15], &sf->uc.uc_mcontext.nds32_r15, err); |
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__put_user_error(regs->uregs[16], &sf->uc.uc_mcontext.nds32_r16, err); |
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__put_user_error(regs->uregs[17], &sf->uc.uc_mcontext.nds32_r17, err); |
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__put_user_error(regs->uregs[18], &sf->uc.uc_mcontext.nds32_r18, err); |
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__put_user_error(regs->uregs[19], &sf->uc.uc_mcontext.nds32_r19, err); |
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__put_user_error(regs->uregs[20], &sf->uc.uc_mcontext.nds32_r20, err); |
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__put_user_error(regs->uregs[21], &sf->uc.uc_mcontext.nds32_r21, err); |
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__put_user_error(regs->uregs[22], &sf->uc.uc_mcontext.nds32_r22, err); |
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__put_user_error(regs->uregs[23], &sf->uc.uc_mcontext.nds32_r23, err); |
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__put_user_error(regs->uregs[24], &sf->uc.uc_mcontext.nds32_r24, err); |
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__put_user_error(regs->uregs[25], &sf->uc.uc_mcontext.nds32_r25, err); |
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__put_user_error(regs->fp, &sf->uc.uc_mcontext.nds32_fp, err); |
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__put_user_error(regs->gp, &sf->uc.uc_mcontext.nds32_gp, err); |
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__put_user_error(regs->lp, &sf->uc.uc_mcontext.nds32_lp, err); |
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__put_user_error(regs->sp, &sf->uc.uc_mcontext.nds32_sp, err); |
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__put_user_error(regs->ipc, &sf->uc.uc_mcontext.nds32_ipc, err); |
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#if defined(CONFIG_HWZOL) |
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__put_user_error(regs->lc, &sf->uc.uc_mcontext.zol.nds32_lc, err); |
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__put_user_error(regs->le, &sf->uc.uc_mcontext.zol.nds32_le, err); |
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__put_user_error(regs->lb, &sf->uc.uc_mcontext.zol.nds32_lb, err); |
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#endif |
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#if IS_ENABLED(CONFIG_FPU) |
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err |= setup_sigcontext_fpu(regs, &sf->uc.uc_mcontext); |
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#endif |
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__put_user_error(current->thread.trap_no, &sf->uc.uc_mcontext.trap_no, |
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err); |
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__put_user_error(current->thread.error_code, |
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&sf->uc.uc_mcontext.error_code, err); |
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__put_user_error(current->thread.address, |
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&sf->uc.uc_mcontext.fault_address, err); |
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__put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err); |
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err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set)); |
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return err; |
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} |
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static inline void __user *get_sigframe(struct ksignal *ksig, |
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struct pt_regs *regs, int framesize) |
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{ |
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unsigned long sp; |
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/* Default to using normal stack */ |
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sp = regs->sp; |
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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 __force *)(-1UL); |
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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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/* |
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* nds32 mandates 8-byte alignment |
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*/ |
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sp &= ~0x7UL; |
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return (void __user *)sp; |
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} |
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static int |
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setup_return(struct pt_regs *regs, struct ksignal *ksig, void __user * frame) |
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{ |
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unsigned long handler = (unsigned long)ksig->ka.sa.sa_handler; |
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unsigned long retcode; |
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retcode = VDSO_SYMBOL(current->mm->context.vdso, rt_sigtramp); |
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regs->uregs[0] = ksig->sig; |
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regs->sp = (unsigned long)frame; |
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regs->lp = retcode; |
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regs->ipc = handler; |
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return 0; |
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} |
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static int |
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setup_rt_frame(struct ksignal *ksig, sigset_t * set, struct pt_regs *regs) |
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{ |
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struct rt_sigframe __user *frame = |
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get_sigframe(ksig, regs, sizeof(*frame)); |
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int err = 0; |
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if (!access_ok(frame, sizeof(*frame))) |
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return -EFAULT; |
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__put_user_error(0, &frame->uc.uc_flags, err); |
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__put_user_error(NULL, &frame->uc.uc_link, err); |
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err |= __save_altstack(&frame->uc.uc_stack, regs->sp); |
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err |= setup_sigframe(frame, regs, set); |
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if (err == 0) { |
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setup_return(regs, ksig, frame); |
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if (ksig->ka.sa.sa_flags & SA_SIGINFO) { |
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err |= copy_siginfo_to_user(&frame->info, &ksig->info); |
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regs->uregs[1] = (unsigned long)&frame->info; |
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regs->uregs[2] = (unsigned long)&frame->uc; |
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} |
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} |
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return err; |
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} |
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/* |
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* OK, we're invoking a handler |
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*/ |
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static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) |
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{ |
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int ret; |
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sigset_t *oldset = sigmask_to_save(); |
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if (in_syscall(regs)) { |
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/* Avoid additional syscall restarting via ret_slow_syscall. */ |
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forget_syscall(regs); |
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switch (regs->uregs[0]) { |
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case -ERESTART_RESTARTBLOCK: |
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case -ERESTARTNOHAND: |
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regs->uregs[0] = -EINTR; |
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break; |
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case -ERESTARTSYS: |
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if (!(ksig->ka.sa.sa_flags & SA_RESTART)) { |
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regs->uregs[0] = -EINTR; |
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break; |
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} |
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fallthrough; |
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case -ERESTARTNOINTR: |
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regs->uregs[0] = regs->orig_r0; |
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regs->ipc -= 4; |
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break; |
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} |
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} |
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/* |
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* Set up the stack frame |
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*/ |
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ret = setup_rt_frame(ksig, oldset, regs); |
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signal_setup_done(ret, ksig, 0); |
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} |
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/* |
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* Note that 'init' is a special process: it doesn't get signals it doesn't |
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* want to handle. Thus you cannot kill init even with a SIGKILL even by |
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* mistake. |
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* |
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* Note that we go through the signals twice: once to check the signals that |
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* the kernel can handle, and then we build all the user-level signal handling |
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* stack-frames in one go after that. |
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*/ |
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static void do_signal(struct pt_regs *regs) |
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{ |
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struct ksignal ksig; |
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if (get_signal(&ksig)) { |
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handle_signal(&ksig, regs); |
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return; |
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} |
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/* |
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* If we were from a system call, check for system call restarting... |
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*/ |
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if (in_syscall(regs)) { |
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/* Restart the system call - no handlers present */ |
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/* Avoid additional syscall restarting via ret_slow_syscall. */ |
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forget_syscall(regs); |
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switch (regs->uregs[0]) { |
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case -ERESTART_RESTARTBLOCK: |
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regs->uregs[15] = __NR_restart_syscall; |
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fallthrough; |
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case -ERESTARTNOHAND: |
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case -ERESTARTSYS: |
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case -ERESTARTNOINTR: |
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regs->uregs[0] = regs->orig_r0; |
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regs->ipc -= 0x4; |
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break; |
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} |
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} |
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restore_saved_sigmask(); |
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} |
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asmlinkage void |
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do_notify_resume(struct pt_regs *regs, unsigned int thread_flags) |
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{ |
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if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) |
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do_signal(regs); |
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if (thread_flags & _TIF_NOTIFY_RESUME) |
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tracehook_notify_resume(regs); |
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}
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