Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
此提交包含在：
Linus Torvalds
320
arch/sh/kernel/ptrace.c
一般檔案
320
arch/sh/kernel/ptrace.c
一般檔案
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/*
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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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*
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*/
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#include <linux/config.h>
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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/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/slab.h>
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#include <linux/security.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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/*
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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 *)
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task->thread_info + THREAD_SIZE - sizeof(struct pt_regs)
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#ifdef CONFIG_SH_DSP
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- sizeof(struct pt_dspregs)
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#endif
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- sizeof(unsigned long);
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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 *)
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task->thread_info + THREAD_SIZE - sizeof(struct pt_regs)
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#ifdef CONFIG_SH_DSP
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- sizeof(struct pt_dspregs)
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#endif
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- sizeof(unsigned long);
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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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/*
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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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asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
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{
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struct task_struct *child;
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struct user * dummy = NULL;
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int ret;
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lock_kernel();
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ret = -EPERM;
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if (request == PTRACE_TRACEME) {
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/* are we already being traced? */
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if (current->ptrace & PT_PTRACED)
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goto out;
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ret = security_ptrace(current->parent, current);
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if (ret)
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goto out;
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/* set the ptrace bit in the process flags. */
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current->ptrace |= PT_PTRACED;
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ret = 0;
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goto out;
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}
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ret = -ESRCH;
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read_lock(&tasklist_lock);
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child = find_task_by_pid(pid);
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if (child)
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get_task_struct(child);
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read_unlock(&tasklist_lock);
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if (!child)
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goto out;
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ret = -EPERM;
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if (pid == 1) /* you may not mess with init */
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goto out_tsk;
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if (request == PTRACE_ATTACH) {
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ret = ptrace_attach(child);
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goto out_tsk;
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}
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ret = ptrace_check_attach(child, request == PTRACE_KILL);
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if (ret < 0)
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goto out_tsk;
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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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unsigned long tmp;
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int copied;
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copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
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ret = -EIO;
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if (copied != sizeof(tmp))
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break;
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ret = put_user(tmp,(unsigned long *) data);
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break;
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}
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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 *)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 = 0;
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if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
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break;
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ret = -EIO;
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break;
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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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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 ((unsigned long) data > _NSIG)
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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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long pc;
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struct pt_regs *dummy = NULL;
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ret = -EIO;
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if ((unsigned long) data > _NSIG)
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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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pc = get_stack_long(child, (long)&dummy->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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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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case PTRACE_DETACH: /* detach a process that was attached. */
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ret = ptrace_detach(child, data);
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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(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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int i;
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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, 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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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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out_tsk:
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put_task_struct(child);
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out:
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unlock_kernel();
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return ret;
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}
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asmlinkage void do_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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/* the 0x80 provides a way for the tracing parent to distinguish
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between a syscall stop and SIGTRAP delivery */
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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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