577 lines
14 KiB
C
577 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* arch/sh/kernel/ptrace_64.c
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003 - 2008 Paul Mundt
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*
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* Started from SH3/4 version:
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* SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
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*
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* Original x86 implementation:
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* By Ross Biro 1/23/92
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* edited by Linus Torvalds
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*/
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#include <linux/kernel.h>
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#include <linux/rwsem.h>
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/bitops.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/signal.h>
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#include <linux/syscalls.h>
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#include <linux/audit.h>
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#include <linux/seccomp.h>
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#include <linux/tracehook.h>
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#include <linux/elf.h>
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#include <linux/regset.h>
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#include <asm/io.h>
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#include <linux/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include <asm/mmu_context.h>
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#include <asm/syscalls.h>
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#include <asm/fpu.h>
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#include <asm/traps.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/syscalls.h>
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/* This mask defines the bits of the SR which the user is not allowed to
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change, which are everything except S, Q, M, PR, SZ, FR. */
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#define SR_MASK (0xffff8cfd)
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/*
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* does not yet catch signals sent when the child dies.
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* in exit.c or in signal.c.
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*/
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/*
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* This routine will get a word from the user area in the process kernel stack.
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*/
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static inline int get_stack_long(struct task_struct *task, int offset)
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{
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unsigned char *stack;
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stack = (unsigned char *)(task->thread.uregs);
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stack += offset;
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return (*((int *)stack));
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}
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static inline unsigned long
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get_fpu_long(struct task_struct *task, unsigned long addr)
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{
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unsigned long tmp;
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struct pt_regs *regs;
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regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
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if (!tsk_used_math(task)) {
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if (addr == offsetof(struct user_fpu_struct, fpscr)) {
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tmp = FPSCR_INIT;
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} else {
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tmp = 0xffffffffUL; /* matches initial value in fpu.c */
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}
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return tmp;
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}
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if (last_task_used_math == task) {
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enable_fpu();
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save_fpu(task);
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disable_fpu();
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last_task_used_math = 0;
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regs->sr |= SR_FD;
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}
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tmp = ((long *)task->thread.xstate)[addr / sizeof(unsigned long)];
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return tmp;
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}
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/*
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* This routine will put a word into the user area in the process kernel stack.
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*/
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static inline int put_stack_long(struct task_struct *task, int offset,
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unsigned long data)
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{
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unsigned char *stack;
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stack = (unsigned char *)(task->thread.uregs);
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stack += offset;
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*(unsigned long *) stack = data;
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return 0;
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}
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static inline int
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put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
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{
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struct pt_regs *regs;
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regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
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if (!tsk_used_math(task)) {
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init_fpu(task);
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} else if (last_task_used_math == task) {
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enable_fpu();
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save_fpu(task);
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disable_fpu();
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last_task_used_math = 0;
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regs->sr |= SR_FD;
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}
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((long *)task->thread.xstate)[addr / sizeof(unsigned long)] = data;
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return 0;
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}
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void user_enable_single_step(struct task_struct *child)
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{
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struct pt_regs *regs = child->thread.uregs;
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regs->sr |= SR_SSTEP; /* auto-resetting upon exception */
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set_tsk_thread_flag(child, TIF_SINGLESTEP);
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}
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void user_disable_single_step(struct task_struct *child)
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{
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struct pt_regs *regs = child->thread.uregs;
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regs->sr &= ~SR_SSTEP;
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clear_tsk_thread_flag(child, TIF_SINGLESTEP);
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}
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static int genregs_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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const struct pt_regs *regs = task_pt_regs(target);
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int ret;
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/* PC, SR, SYSCALL */
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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®s->pc,
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0, 3 * sizeof(unsigned long long));
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/* R1 -> R63 */
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if (!ret)
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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regs->regs,
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offsetof(struct pt_regs, regs[0]),
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63 * sizeof(unsigned long long));
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/* TR0 -> TR7 */
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if (!ret)
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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regs->tregs,
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offsetof(struct pt_regs, tregs[0]),
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8 * sizeof(unsigned long long));
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if (!ret)
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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sizeof(struct pt_regs), -1);
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return ret;
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}
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static int genregs_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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struct pt_regs *regs = task_pt_regs(target);
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int ret;
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/* PC, SR, SYSCALL */
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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®s->pc,
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0, 3 * sizeof(unsigned long long));
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/* R1 -> R63 */
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if (!ret && count > 0)
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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regs->regs,
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offsetof(struct pt_regs, regs[0]),
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63 * sizeof(unsigned long long));
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/* TR0 -> TR7 */
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if (!ret && count > 0)
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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regs->tregs,
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offsetof(struct pt_regs, tregs[0]),
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8 * sizeof(unsigned long long));
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if (!ret)
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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sizeof(struct pt_regs), -1);
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return ret;
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}
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#ifdef CONFIG_SH_FPU
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int fpregs_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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int ret;
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ret = init_fpu(target);
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if (ret)
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return ret;
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&target->thread.xstate->hardfpu, 0, -1);
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}
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static int fpregs_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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int ret;
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ret = init_fpu(target);
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if (ret)
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return ret;
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set_stopped_child_used_math(target);
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return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.xstate->hardfpu, 0, -1);
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}
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static int fpregs_active(struct task_struct *target,
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const struct user_regset *regset)
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{
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return tsk_used_math(target) ? regset->n : 0;
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}
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#endif
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const struct pt_regs_offset regoffset_table[] = {
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REG_OFFSET_NAME(pc),
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REG_OFFSET_NAME(sr),
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REG_OFFSET_NAME(syscall_nr),
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REGS_OFFSET_NAME(0),
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REGS_OFFSET_NAME(1),
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REGS_OFFSET_NAME(2),
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REGS_OFFSET_NAME(3),
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REGS_OFFSET_NAME(4),
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REGS_OFFSET_NAME(5),
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REGS_OFFSET_NAME(6),
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REGS_OFFSET_NAME(7),
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REGS_OFFSET_NAME(8),
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REGS_OFFSET_NAME(9),
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REGS_OFFSET_NAME(10),
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REGS_OFFSET_NAME(11),
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REGS_OFFSET_NAME(12),
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REGS_OFFSET_NAME(13),
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REGS_OFFSET_NAME(14),
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REGS_OFFSET_NAME(15),
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REGS_OFFSET_NAME(16),
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REGS_OFFSET_NAME(17),
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REGS_OFFSET_NAME(18),
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REGS_OFFSET_NAME(19),
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REGS_OFFSET_NAME(20),
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REGS_OFFSET_NAME(21),
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REGS_OFFSET_NAME(22),
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REGS_OFFSET_NAME(23),
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REGS_OFFSET_NAME(24),
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REGS_OFFSET_NAME(25),
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REGS_OFFSET_NAME(26),
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REGS_OFFSET_NAME(27),
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REGS_OFFSET_NAME(28),
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REGS_OFFSET_NAME(29),
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REGS_OFFSET_NAME(30),
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REGS_OFFSET_NAME(31),
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REGS_OFFSET_NAME(32),
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REGS_OFFSET_NAME(33),
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REGS_OFFSET_NAME(34),
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REGS_OFFSET_NAME(35),
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REGS_OFFSET_NAME(36),
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REGS_OFFSET_NAME(37),
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REGS_OFFSET_NAME(38),
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REGS_OFFSET_NAME(39),
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REGS_OFFSET_NAME(40),
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REGS_OFFSET_NAME(41),
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REGS_OFFSET_NAME(42),
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REGS_OFFSET_NAME(43),
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REGS_OFFSET_NAME(44),
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REGS_OFFSET_NAME(45),
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REGS_OFFSET_NAME(46),
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REGS_OFFSET_NAME(47),
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REGS_OFFSET_NAME(48),
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REGS_OFFSET_NAME(49),
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REGS_OFFSET_NAME(50),
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REGS_OFFSET_NAME(51),
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REGS_OFFSET_NAME(52),
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REGS_OFFSET_NAME(53),
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REGS_OFFSET_NAME(54),
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REGS_OFFSET_NAME(55),
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REGS_OFFSET_NAME(56),
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REGS_OFFSET_NAME(57),
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REGS_OFFSET_NAME(58),
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REGS_OFFSET_NAME(59),
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REGS_OFFSET_NAME(60),
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REGS_OFFSET_NAME(61),
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REGS_OFFSET_NAME(62),
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REGS_OFFSET_NAME(63),
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TREGS_OFFSET_NAME(0),
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TREGS_OFFSET_NAME(1),
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TREGS_OFFSET_NAME(2),
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TREGS_OFFSET_NAME(3),
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TREGS_OFFSET_NAME(4),
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TREGS_OFFSET_NAME(5),
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TREGS_OFFSET_NAME(6),
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TREGS_OFFSET_NAME(7),
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REG_OFFSET_END,
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};
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/*
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* These are our native regset flavours.
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*/
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enum sh_regset {
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REGSET_GENERAL,
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#ifdef CONFIG_SH_FPU
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REGSET_FPU,
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#endif
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};
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static const struct user_regset sh_regsets[] = {
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/*
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* Format is:
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* PC, SR, SYSCALL,
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* R1 --> R63,
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* TR0 --> TR7,
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*/
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[REGSET_GENERAL] = {
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.core_note_type = NT_PRSTATUS,
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.n = ELF_NGREG,
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.size = sizeof(long long),
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.align = sizeof(long long),
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.get = genregs_get,
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.set = genregs_set,
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},
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#ifdef CONFIG_SH_FPU
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[REGSET_FPU] = {
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.core_note_type = NT_PRFPREG,
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.n = sizeof(struct user_fpu_struct) /
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sizeof(long long),
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.size = sizeof(long long),
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.align = sizeof(long long),
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.get = fpregs_get,
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.set = fpregs_set,
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.active = fpregs_active,
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},
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#endif
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};
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static const struct user_regset_view user_sh64_native_view = {
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.name = "sh64",
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.e_machine = EM_SH,
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.regsets = sh_regsets,
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.n = ARRAY_SIZE(sh_regsets),
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};
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const struct user_regset_view *task_user_regset_view(struct task_struct *task)
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{
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return &user_sh64_native_view;
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}
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long arch_ptrace(struct task_struct *child, long request,
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unsigned long addr, unsigned long data)
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{
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int ret;
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unsigned long __user *datap = (unsigned long __user *) data;
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switch (request) {
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/* read the word at location addr in the USER area. */
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case PTRACE_PEEKUSR: {
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unsigned long tmp;
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ret = -EIO;
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if ((addr & 3) || addr < 0)
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break;
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if (addr < sizeof(struct pt_regs))
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tmp = get_stack_long(child, addr);
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else if ((addr >= offsetof(struct user, fpu)) &&
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(addr < offsetof(struct user, u_fpvalid))) {
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unsigned long index;
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ret = init_fpu(child);
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if (ret)
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break;
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index = addr - offsetof(struct user, fpu);
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tmp = get_fpu_long(child, index);
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} else if (addr == offsetof(struct user, u_fpvalid)) {
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tmp = !!tsk_used_math(child);
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} else {
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break;
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}
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ret = put_user(tmp, datap);
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break;
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}
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case PTRACE_POKEUSR:
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/* write the word at location addr in the USER area. We must
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disallow any changes to certain SR bits or u_fpvalid, since
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this could crash the kernel or result in a security
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loophole. */
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ret = -EIO;
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if ((addr & 3) || addr < 0)
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break;
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if (addr < sizeof(struct pt_regs)) {
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/* Ignore change of top 32 bits of SR */
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if (addr == offsetof (struct pt_regs, sr)+4)
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{
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ret = 0;
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break;
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}
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/* If lower 32 bits of SR, ignore non-user bits */
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if (addr == offsetof (struct pt_regs, sr))
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{
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long cursr = get_stack_long(child, addr);
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data &= ~(SR_MASK);
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data |= (cursr & SR_MASK);
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}
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ret = put_stack_long(child, addr, data);
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}
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else if ((addr >= offsetof(struct user, fpu)) &&
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(addr < offsetof(struct user, u_fpvalid))) {
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unsigned long index;
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ret = init_fpu(child);
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if (ret)
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break;
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index = addr - offsetof(struct user, fpu);
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ret = put_fpu_long(child, index, data);
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}
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break;
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case PTRACE_GETREGS:
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return copy_regset_to_user(child, &user_sh64_native_view,
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REGSET_GENERAL,
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0, sizeof(struct pt_regs),
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datap);
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case PTRACE_SETREGS:
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return copy_regset_from_user(child, &user_sh64_native_view,
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REGSET_GENERAL,
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0, sizeof(struct pt_regs),
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datap);
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#ifdef CONFIG_SH_FPU
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case PTRACE_GETFPREGS:
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return copy_regset_to_user(child, &user_sh64_native_view,
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REGSET_FPU,
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0, sizeof(struct user_fpu_struct),
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datap);
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case PTRACE_SETFPREGS:
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return copy_regset_from_user(child, &user_sh64_native_view,
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REGSET_FPU,
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0, sizeof(struct user_fpu_struct),
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datap);
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#endif
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default:
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ret = ptrace_request(child, request, addr, data);
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break;
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}
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return ret;
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}
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asmlinkage int sh64_ptrace(long request, long pid,
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unsigned long addr, unsigned long data)
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{
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#define WPC_DBRMODE 0x0d104008
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static unsigned long first_call;
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if (!test_and_set_bit(0, &first_call)) {
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/* Set WPC.DBRMODE to 0. This makes all debug events get
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* delivered through RESVEC, i.e. into the handlers in entry.S.
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* (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
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* would normally be left set to 1, which makes debug events get
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* delivered through DBRVEC, i.e. into the remote gdb's
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* handlers. This prevents ptrace getting them, and confuses
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* the remote gdb.) */
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printk("DBRMODE set to 0 to permit native debugging\n");
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poke_real_address_q(WPC_DBRMODE, 0);
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}
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return sys_ptrace(request, pid, addr, data);
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}
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asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs)
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{
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long long ret = 0;
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secure_computing_strict(regs->regs[9]);
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if (test_thread_flag(TIF_SYSCALL_TRACE) &&
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tracehook_report_syscall_entry(regs))
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/*
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* Tracing decided this syscall should not happen.
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* We'll return a bogus call number to get an ENOSYS
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* error, but leave the original number in regs->regs[0].
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*/
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ret = -1LL;
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if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
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trace_sys_enter(regs, regs->regs[9]);
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audit_syscall_entry(regs->regs[1], regs->regs[2], regs->regs[3],
|
|
regs->regs[4], regs->regs[5]);
|
|
|
|
return ret ?: regs->regs[9];
|
|
}
|
|
|
|
asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
|
|
{
|
|
int step;
|
|
|
|
audit_syscall_exit(regs);
|
|
|
|
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
|
|
trace_sys_exit(regs, regs->regs[9]);
|
|
|
|
step = test_thread_flag(TIF_SINGLESTEP);
|
|
if (step || test_thread_flag(TIF_SYSCALL_TRACE))
|
|
tracehook_report_syscall_exit(regs, step);
|
|
}
|
|
|
|
/* Called with interrupts disabled */
|
|
asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
|
|
{
|
|
/* This is called after a single step exception (DEBUGSS).
|
|
There is no need to change the PC, as it is a post-execution
|
|
exception, as entry.S does not do anything to the PC for DEBUGSS.
|
|
We need to clear the Single Step setting in SR to avoid
|
|
continually stepping. */
|
|
local_irq_enable();
|
|
regs->sr &= ~SR_SSTEP;
|
|
force_sig(SIGTRAP);
|
|
}
|
|
|
|
/* Called with interrupts disabled */
|
|
BUILD_TRAP_HANDLER(breakpoint)
|
|
{
|
|
TRAP_HANDLER_DECL;
|
|
|
|
/* We need to forward step the PC, to counteract the backstep done
|
|
in signal.c. */
|
|
local_irq_enable();
|
|
force_sig(SIGTRAP);
|
|
regs->pc += 4;
|
|
}
|
|
|
|
/*
|
|
* Called by kernel/ptrace.c when detaching..
|
|
*
|
|
* Make sure single step bits etc are not set.
|
|
*/
|
|
void ptrace_disable(struct task_struct *child)
|
|
{
|
|
user_disable_single_step(child);
|
|
}
|