333 lines
8.4 KiB
C
333 lines
8.4 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* arch/sh64/kernel/ptrace.c
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003 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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*/
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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/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.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 <asm/io.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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/* 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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fpsave(&task->thread.fpu.hard);
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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.fpu)[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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fpinit(&task->thread.fpu.hard);
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set_stopped_child_used_math(task);
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} else if (last_task_used_math == task) {
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enable_fpu();
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fpsave(&task->thread.fpu.hard);
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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.fpu)[addr / sizeof(unsigned long)] = data;
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return 0;
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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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int ret;
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switch (request) {
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/* when I and D space are separate, these will need to be fixed. */
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case PTRACE_PEEKTEXT: /* read word at location addr. */
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case PTRACE_PEEKDATA:
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ret = generic_ptrace_peekdata(child, addr, data);
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break;
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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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tmp = get_fpu_long(child, addr - offsetof(struct user, fpu));
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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, (unsigned long *)data);
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break;
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}
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/* when I and D space are separate, this will have to be fixed. */
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case PTRACE_POKETEXT: /* write the word at location addr. */
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case PTRACE_POKEDATA:
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ret = generic_ptrace_pokedata(child, addr, data);
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break;
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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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ret = put_fpu_long(child, addr - offsetof(struct user, fpu), data);
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}
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break;
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case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
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case PTRACE_CONT: { /* restart after signal. */
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ret = -EIO;
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if (!valid_signal(data))
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break;
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if (request == PTRACE_SYSCALL)
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set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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else
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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child->exit_code = data;
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wake_up_process(child);
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ret = 0;
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break;
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}
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/*
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* make the child exit. Best I can do is send it a sigkill.
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* perhaps it should be put in the status that it wants to
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* exit.
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*/
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case PTRACE_KILL: {
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ret = 0;
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if (child->exit_state == EXIT_ZOMBIE) /* already dead */
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break;
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child->exit_code = SIGKILL;
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wake_up_process(child);
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break;
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}
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case PTRACE_SINGLESTEP: { /* set the trap flag. */
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struct pt_regs *regs;
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ret = -EIO;
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if (!valid_signal(data))
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break;
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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if ((child->ptrace & PT_DTRACE) == 0) {
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/* Spurious delayed TF traps may occur */
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child->ptrace |= PT_DTRACE;
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}
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regs = child->thread.uregs;
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regs->sr |= SR_SSTEP; /* auto-resetting upon exception */
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child->exit_code = data;
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/* give it a chance to run. */
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wake_up_process(child);
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ret = 0;
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break;
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}
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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, long addr, long data)
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{
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extern void poke_real_address_q(unsigned long long addr, unsigned long long data);
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#define WPC_DBRMODE 0x0d104008
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static int first_call = 1;
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lock_kernel();
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if (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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first_call = 0;
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}
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unlock_kernel();
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return sys_ptrace(request, pid, addr, data);
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}
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asmlinkage void syscall_trace(void)
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{
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struct task_struct *tsk = current;
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if (!test_thread_flag(TIF_SYSCALL_TRACE))
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return;
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if (!(tsk->ptrace & PT_PTRACED))
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return;
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ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
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? 0x80 : 0));
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/*
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* this isn't the same as continuing with a signal, but it will do
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* for normal use. strace only continues with a signal if the
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* stopping signal is not SIGTRAP. -brl
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*/
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if (tsk->exit_code) {
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send_sig(tsk->exit_code, tsk, 1);
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tsk->exit_code = 0;
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}
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}
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/* Called with interrupts disabled */
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asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
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{
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/* This is called after a single step exception (DEBUGSS).
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There is no need to change the PC, as it is a post-execution
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exception, as entry.S does not do anything to the PC for DEBUGSS.
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We need to clear the Single Step setting in SR to avoid
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continually stepping. */
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local_irq_enable();
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regs->sr &= ~SR_SSTEP;
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force_sig(SIGTRAP, current);
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}
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/* Called with interrupts disabled */
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asmlinkage void do_software_break_point(unsigned long long vec,
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struct pt_regs *regs)
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{
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/* We need to forward step the PC, to counteract the backstep done
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in signal.c. */
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local_irq_enable();
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force_sig(SIGTRAP, current);
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regs->pc += 4;
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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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/* nothing to do.. */
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}
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