387 lines
12 KiB
C
387 lines
12 KiB
C
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// 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);
|
||
|
|
|
||
|
|
switch (regs->uregs[0]) {
|
||
|
|
case -ERESTART_RESTARTBLOCK:
|
||
|
|
case -ERESTARTNOHAND:
|
||
|
|
regs->uregs[0] = -EINTR;
|
||
|
|
break;
|
||
|
|
case -ERESTARTSYS:
|
||
|
|
if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
|
||
|
|
regs->uregs[0] = -EINTR;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
/* Else, fall through */
|
||
|
|
case -ERESTARTNOINTR:
|
||
|
|
regs->uregs[0] = regs->orig_r0;
|
||
|
|
regs->ipc -= 4;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/*
|
||
|
|
* Set up the stack frame
|
||
|
|
*/
|
||
|
|
ret = setup_rt_frame(ksig, oldset, regs);
|
||
|
|
|
||
|
|
signal_setup_done(ret, ksig, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* Note that we go through the signals twice: once to check the signals that
|
||
|
|
* the kernel can handle, and then we build all the user-level signal handling
|
||
|
|
* stack-frames in one go after that.
|
||
|
|
*/
|
||
|
|
static void do_signal(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
struct ksignal ksig;
|
||
|
|
|
||
|
|
if (get_signal(&ksig)) {
|
||
|
|
handle_signal(&ksig, regs);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If we were from a system call, check for system call restarting...
|
||
|
|
*/
|
||
|
|
if (in_syscall(regs)) {
|
||
|
|
/* Restart the system call - no handlers present */
|
||
|
|
|
||
|
|
/* Avoid additional syscall restarting via ret_slow_syscall. */
|
||
|
|
forget_syscall(regs);
|
||
|
|
|
||
|
|
switch (regs->uregs[0]) {
|
||
|
|
case -ERESTART_RESTARTBLOCK:
|
||
|
|
regs->uregs[15] = __NR_restart_syscall;
|
||
|
|
/* Fall through */
|
||
|
|
case -ERESTARTNOHAND:
|
||
|
|
case -ERESTARTSYS:
|
||
|
|
case -ERESTARTNOINTR:
|
||
|
|
regs->uregs[0] = regs->orig_r0;
|
||
|
|
regs->ipc -= 0x4;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
restore_saved_sigmask();
|
||
|
|
}
|
||
|
|
|
||
|
|
asmlinkage void
|
||
|
|
do_notify_resume(struct pt_regs *regs, unsigned int thread_flags)
|
||
|
|
{
|
||
|
|
if (thread_flags & _TIF_SIGPENDING)
|
||
|
|
do_signal(regs);
|
||
|
|
|
||
|
|
if (thread_flags & _TIF_NOTIFY_RESUME) {
|
||
|
|
clear_thread_flag(TIF_NOTIFY_RESUME);
|
||
|
|
tracehook_notify_resume(regs);
|
||
|
|
}
|
||
|
|
}
|