2 * linux/arch/ppc64/kernel/ptrace.c
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
7 * Derived from "arch/m68k/kernel/ptrace.c"
8 * Copyright (C) 1994 by Hamish Macdonald
9 * Taken from linux/kernel/ptrace.c and modified for M680x0.
10 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
12 * Modified by Cort Dougan (cort@hq.fsmlabs.com)
13 * and Paul Mackerras (paulus@linuxcare.com.au).
15 * This file is subject to the terms and conditions of the GNU General
16 * Public License. See the file README.legal in the main directory of
17 * this archive for more details.
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
23 #include <linux/smp.h>
24 #include <linux/smp_lock.h>
25 #include <linux/errno.h>
26 #include <linux/ptrace.h>
27 #include <linux/user.h>
28 #include <linux/security.h>
29 #include <linux/audit.h>
31 #include <asm/uaccess.h>
33 #include <asm/pgtable.h>
34 #include <asm/system.h>
35 #include <asm/ptrace-common.h>
38 * does not yet catch signals sent when the child dies.
39 * in exit.c or in signal.c.
43 * Called by kernel/ptrace.c when detaching..
45 * Make sure single step bits etc are not set.
47 void ptrace_disable(struct task_struct *child)
49 /* make sure the single step bit is not set. */
50 clear_single_step(child);
53 int sys_ptrace(long request, long pid, long addr, long data)
55 struct task_struct *child;
59 if (request == PTRACE_TRACEME) {
60 /* are we already being traced? */
61 if (current->ptrace & PT_PTRACED)
63 ret = security_ptrace(current->parent, current);
66 /* set the ptrace bit in the process flags. */
67 current->ptrace |= PT_PTRACED;
72 read_lock(&tasklist_lock);
73 child = find_task_by_pid(pid);
75 get_task_struct(child);
76 read_unlock(&tasklist_lock);
81 if (pid == 1) /* you may not mess with init */
84 if (request == PTRACE_ATTACH) {
85 ret = ptrace_attach(child);
89 ret = ptrace_check_attach(child, request == PTRACE_KILL);
94 /* when I and D space are separate, these will need to be fixed. */
95 case PTRACE_PEEKTEXT: /* read word at location addr. */
96 case PTRACE_PEEKDATA: {
100 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
102 if (copied != sizeof(tmp))
104 ret = put_user(tmp,(unsigned long *) data);
108 /* read the word at location addr in the USER area. */
109 case PTRACE_PEEKUSR: {
114 /* convert to index and check */
115 index = (unsigned long) addr >> 3;
116 if ((addr & 7) || (index > PT_FPSCR))
119 if (index < PT_FPR0) {
120 tmp = get_reg(child, (int)index);
122 if (child->thread.regs->msr & MSR_FP)
124 tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0];
126 ret = put_user(tmp,(unsigned long *) data);
130 /* If I and D space are separate, this will have to be fixed. */
131 case PTRACE_POKETEXT: /* write the word at location addr. */
132 case PTRACE_POKEDATA:
134 if (access_process_vm(child, addr, &data, sizeof(data), 1)
140 /* write the word at location addr in the USER area */
141 case PTRACE_POKEUSR: {
145 /* convert to index and check */
146 index = (unsigned long) addr >> 3;
147 if ((addr & 7) || (index > PT_FPSCR))
150 if (index == PT_ORIG_R3)
152 if (index < PT_FPR0) {
153 ret = put_reg(child, index, data);
155 if (child->thread.regs->msr & MSR_FP)
157 ((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data;
163 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
164 case PTRACE_CONT: { /* restart after signal. */
166 if ((unsigned long) data > _NSIG)
168 if (request == PTRACE_SYSCALL)
169 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
171 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
172 child->exit_code = data;
173 /* make sure the single step bit is not set. */
174 clear_single_step(child);
175 wake_up_process(child);
181 * make the child exit. Best I can do is send it a sigkill.
182 * perhaps it should be put in the status that it wants to
187 if (child->state == TASK_ZOMBIE) /* already dead */
189 child->exit_code = SIGKILL;
190 /* make sure the single step bit is not set. */
191 clear_single_step(child);
192 wake_up_process(child);
196 case PTRACE_SINGLESTEP: { /* set the trap flag. */
198 if ((unsigned long) data > _NSIG)
200 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
201 set_single_step(child);
202 child->exit_code = data;
203 /* give it a chance to run. */
204 wake_up_process(child);
210 ret = ptrace_detach(child, data);
213 case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
215 unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
216 unsigned long *tmp = (unsigned long *)addr;
218 for (i = 0; i < 32; i++) {
219 ret = put_user(*reg, tmp);
228 case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
230 unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
231 unsigned long *tmp = (unsigned long *)addr;
233 for (i = 0; i < 32; i++) {
234 ret = get_user(*reg, tmp);
243 case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
245 unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
246 unsigned long *tmp = (unsigned long *)addr;
248 if (child->thread.regs->msr & MSR_FP)
251 for (i = 0; i < 32; i++) {
252 ret = put_user(*reg, tmp);
261 case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
263 unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
264 unsigned long *tmp = (unsigned long *)addr;
266 if (child->thread.regs->msr & MSR_FP)
269 for (i = 0; i < 32; i++) {
270 ret = get_user(*reg, tmp);
280 ret = ptrace_request(child, request, addr, data);
284 put_task_struct(child);
290 static void do_syscall_trace(void)
292 /* the 0x80 provides a way for the tracing parent to distinguish
293 between a syscall stop and SIGTRAP delivery */
294 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
298 * this isn't the same as continuing with a signal, but it will do
299 * for normal use. strace only continues with a signal if the
300 * stopping signal is not SIGTRAP. -brl
302 if (current->exit_code) {
303 send_sig(current->exit_code, current, 1);
304 current->exit_code = 0;
308 void do_syscall_trace_enter(struct pt_regs *regs)
310 if (unlikely(current->audit_context))
311 audit_syscall_entry(current, regs->gpr[0],
312 regs->gpr[3], regs->gpr[4],
313 regs->gpr[5], regs->gpr[6]);
315 if (test_thread_flag(TIF_SYSCALL_TRACE)
316 && (current->ptrace & PT_PTRACED))
320 void do_syscall_trace_leave(void)
322 if (unlikely(current->audit_context))
323 audit_syscall_exit(current, 0); /* FIXME: pass pt_regs */
325 if (test_thread_flag(TIF_SYSCALL_TRACE)
326 && (current->ptrace & PT_PTRACED))