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265 lines
5.8 KiB
265 lines
5.8 KiB
/*
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* linux/arch/sh/kernel/ptrace.c
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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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* SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
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* Audit support: Yuichi Nakamura <ynakam@hitachisoft.jp>
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/slab.h>
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#include <linux/security.h>
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#include <linux/signal.h>
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#include <linux/io.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 <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/processor.h>
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#include <asm/mmu_context.h>
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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 off of 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_pt_regs(task);
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stack += offset;
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return (*((int *)stack));
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}
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/*
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* This routine will put a word on 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_pt_regs(task);
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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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void user_enable_single_step(struct task_struct *child)
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{
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struct pt_regs *regs = task_pt_regs(child);
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long pc;
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pc = get_stack_long(child, (long)®s->pc);
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/* Next scheduling will set up UBC */
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if (child->thread.ubc_pc == 0)
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ubc_usercnt += 1;
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child->thread.ubc_pc = pc;
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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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clear_tsk_thread_flag(child, TIF_SINGLESTEP);
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/*
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* Ensure the UBC is not programmed at the next context switch.
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*
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* Normally this is not needed but there are sequences such as
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* singlestep, signal delivery, and continue that leave the
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* ubc_pc non-zero leading to spurious SIGTRAPs.
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*/
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if (child->thread.ubc_pc != 0) {
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ubc_usercnt -= 1;
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child->thread.ubc_pc = 0;
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}
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}
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/*
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* Called by kernel/ptrace.c when detaching..
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*
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* Make sure single step bits etc are not set.
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*/
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void ptrace_disable(struct task_struct *child)
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{
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user_disable_single_step(child);
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}
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long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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{
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struct user * dummy = NULL;
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int ret;
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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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addr > sizeof(struct user) - 3)
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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 >= (long) &dummy->fpu &&
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addr < (long) &dummy->u_fpvalid) {
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if (!tsk_used_math(child)) {
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if (addr == (long)&dummy->fpu.fpscr)
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tmp = FPSCR_INIT;
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else
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tmp = 0;
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} else
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tmp = ((long *)&child->thread.fpu)
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[(addr - (long)&dummy->fpu) >> 2];
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} else if (addr == (long) &dummy->u_fpvalid)
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tmp = !!tsk_used_math(child);
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else
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tmp = 0;
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ret = put_user(tmp, (unsigned long __user *)data);
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break;
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}
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case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
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ret = -EIO;
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if ((addr & 3) || addr < 0 ||
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addr > sizeof(struct user) - 3)
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break;
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if (addr < sizeof(struct pt_regs))
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ret = put_stack_long(child, addr, data);
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else if (addr >= (long) &dummy->fpu &&
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addr < (long) &dummy->u_fpvalid) {
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set_stopped_child_used_math(child);
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((long *)&child->thread.fpu)
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[(addr - (long)&dummy->fpu) >> 2] = data;
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ret = 0;
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} else if (addr == (long) &dummy->u_fpvalid) {
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conditional_stopped_child_used_math(data, child);
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ret = 0;
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}
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break;
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#ifdef CONFIG_SH_DSP
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case PTRACE_GETDSPREGS: {
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unsigned long dp;
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ret = -EIO;
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dp = ((unsigned long) child) + THREAD_SIZE -
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sizeof(struct pt_dspregs);
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if (*((int *) (dp - 4)) == SR_FD) {
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copy_to_user((void *)addr, (void *) dp,
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sizeof(struct pt_dspregs));
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ret = 0;
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}
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break;
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}
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case PTRACE_SETDSPREGS: {
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unsigned long dp;
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ret = -EIO;
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dp = ((unsigned long) child) + THREAD_SIZE -
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sizeof(struct pt_dspregs);
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if (*((int *) (dp - 4)) == SR_FD) {
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copy_from_user((void *) dp, (void *)addr,
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sizeof(struct pt_dspregs));
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ret = 0;
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}
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break;
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}
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#endif
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#ifdef CONFIG_BINFMT_ELF_FDPIC
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case PTRACE_GETFDPIC: {
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unsigned long tmp = 0;
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switch (addr) {
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case PTRACE_GETFDPIC_EXEC:
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tmp = child->mm->context.exec_fdpic_loadmap;
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break;
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case PTRACE_GETFDPIC_INTERP:
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tmp = child->mm->context.interp_fdpic_loadmap;
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break;
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default:
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break;
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}
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ret = 0;
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if (put_user(tmp, (unsigned long *) data)) {
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ret = -EFAULT;
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break;
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}
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break;
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}
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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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static inline int audit_arch(void)
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{
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int arch = EM_SH;
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#ifdef CONFIG_CPU_LITTLE_ENDIAN
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arch |= __AUDIT_ARCH_LE;
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#endif
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return arch;
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}
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asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
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{
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long ret = 0;
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secure_computing(regs->regs[0]);
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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 = -1L;
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if (unlikely(current->audit_context))
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audit_syscall_entry(audit_arch(), regs->regs[3],
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regs->regs[4], regs->regs[5],
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regs->regs[6], regs->regs[7]);
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return ret ?: regs->regs[0];
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}
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asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
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{
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int step;
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if (unlikely(current->audit_context))
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audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
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regs->regs[0]);
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step = test_thread_flag(TIF_SINGLESTEP);
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if (step || test_thread_flag(TIF_SYSCALL_TRACE))
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tracehook_report_syscall_exit(regs, step);
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}
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