2 * linux/arch/sh/kernel/ptrace.c
4 * Original x86 implementation:
6 * edited by Linus Torvalds
8 * SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
12 #include <linux/config.h>
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
16 #include <linux/smp.h>
17 #include <linux/smp_lock.h>
18 #include <linux/errno.h>
19 #include <linux/ptrace.h>
20 #include <linux/user.h>
21 #include <linux/slab.h>
22 #include <linux/security.h>
23 #include <linux/signal.h>
26 #include <asm/uaccess.h>
27 #include <asm/pgtable.h>
28 #include <asm/system.h>
29 #include <asm/processor.h>
30 #include <asm/mmu_context.h>
33 * does not yet catch signals sent when the child dies.
34 * in exit.c or in signal.c.
38 * This routine will get a word off of the process kernel stack.
40 static inline int get_stack_long(struct task_struct *task, int offset)
44 stack = (unsigned char *)
45 task->thread_info + THREAD_SIZE - sizeof(struct pt_regs)
47 - sizeof(struct pt_dspregs)
49 - sizeof(unsigned long);
51 return (*((int *)stack));
55 * This routine will put a word on the process kernel stack.
57 static inline int put_stack_long(struct task_struct *task, int offset,
62 stack = (unsigned char *)
63 task->thread_info + THREAD_SIZE - sizeof(struct pt_regs)
65 - sizeof(struct pt_dspregs)
67 - sizeof(unsigned long);
69 *(unsigned long *) stack = data;
74 * Called by kernel/ptrace.c when detaching..
76 * Make sure single step bits etc are not set.
78 void ptrace_disable(struct task_struct *child)
83 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
85 struct user * dummy = NULL;
89 /* when I and D space are separate, these will need to be fixed. */
90 case PTRACE_PEEKTEXT: /* read word at location addr. */
91 case PTRACE_PEEKDATA: {
95 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
97 if (copied != sizeof(tmp))
99 ret = put_user(tmp,(unsigned long *) data);
103 /* read the word at location addr in the USER area. */
104 case PTRACE_PEEKUSR: {
108 if ((addr & 3) || addr < 0 ||
109 addr > sizeof(struct user) - 3)
112 if (addr < sizeof(struct pt_regs))
113 tmp = get_stack_long(child, addr);
114 else if (addr >= (long) &dummy->fpu &&
115 addr < (long) &dummy->u_fpvalid) {
116 if (!tsk_used_math(child)) {
117 if (addr == (long)&dummy->fpu.fpscr)
122 tmp = ((long *)&child->thread.fpu)
123 [(addr - (long)&dummy->fpu) >> 2];
124 } else if (addr == (long) &dummy->u_fpvalid)
125 tmp = !!tsk_used_math(child);
128 ret = put_user(tmp, (unsigned long *)data);
132 /* when I and D space are separate, this will have to be fixed. */
133 case PTRACE_POKETEXT: /* write the word at location addr. */
134 case PTRACE_POKEDATA:
136 if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
141 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
143 if ((addr & 3) || addr < 0 ||
144 addr > sizeof(struct user) - 3)
147 if (addr < sizeof(struct pt_regs))
148 ret = put_stack_long(child, addr, data);
149 else if (addr >= (long) &dummy->fpu &&
150 addr < (long) &dummy->u_fpvalid) {
151 set_stopped_child_used_math(child);
152 ((long *)&child->thread.fpu)
153 [(addr - (long)&dummy->fpu) >> 2] = data;
155 } else if (addr == (long) &dummy->u_fpvalid) {
156 conditional_stopped_child_used_math(data, child);
161 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
162 case PTRACE_CONT: { /* restart after signal. */
164 if (!valid_signal(data))
166 if (request == PTRACE_SYSCALL)
167 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
169 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
170 child->exit_code = data;
171 wake_up_process(child);
177 * make the child exit. Best I can do is send it a sigkill.
178 * perhaps it should be put in the status that it wants to
183 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
185 child->exit_code = SIGKILL;
186 wake_up_process(child);
190 case PTRACE_SINGLESTEP: { /* set the trap flag. */
192 struct pt_regs *dummy = NULL;
195 if (!valid_signal(data))
197 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
198 if ((child->ptrace & PT_DTRACE) == 0) {
199 /* Spurious delayed TF traps may occur */
200 child->ptrace |= PT_DTRACE;
203 pc = get_stack_long(child, (long)&dummy->pc);
205 /* Next scheduling will set up UBC */
206 if (child->thread.ubc_pc == 0)
208 child->thread.ubc_pc = pc;
210 child->exit_code = data;
211 /* give it a chance to run. */
212 wake_up_process(child);
217 case PTRACE_DETACH: /* detach a process that was attached. */
218 ret = ptrace_detach(child, data);
222 case PTRACE_GETDSPREGS: {
226 dp = ((unsigned long) child) + THREAD_SIZE -
227 sizeof(struct pt_dspregs);
228 if (*((int *) (dp - 4)) == SR_FD) {
229 copy_to_user(addr, (void *) dp,
230 sizeof(struct pt_dspregs));
236 case PTRACE_SETDSPREGS: {
241 dp = ((unsigned long) child) + THREAD_SIZE -
242 sizeof(struct pt_dspregs);
243 if (*((int *) (dp - 4)) == SR_FD) {
244 copy_from_user((void *) dp, addr,
245 sizeof(struct pt_dspregs));
252 ret = ptrace_request(child, request, addr, data);
259 asmlinkage void do_syscall_trace(void)
261 struct task_struct *tsk = current;
263 if (!test_thread_flag(TIF_SYSCALL_TRACE))
265 if (!(tsk->ptrace & PT_PTRACED))
267 /* the 0x80 provides a way for the tracing parent to distinguish
268 between a syscall stop and SIGTRAP delivery */
269 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
273 * this isn't the same as continuing with a signal, but it will do
274 * for normal use. strace only continues with a signal if the
275 * stopping signal is not SIGTRAP. -brl
277 if (tsk->exit_code) {
278 send_sig(tsk->exit_code, tsk, 1);