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/config.h>
21 #include <linux/kernel.h>
22 #include <linux/sched.h>
24 #include <linux/smp.h>
25 #include <linux/smp_lock.h>
26 #include <linux/errno.h>
27 #include <linux/ptrace.h>
28 #include <linux/user.h>
29 #include <linux/security.h>
30 #include <linux/audit.h>
31 #include <linux/seccomp.h>
32 #include <linux/signal.h>
34 #include <asm/uaccess.h>
36 #include <asm/pgtable.h>
37 #include <asm/system.h>
38 #include <asm/ptrace-common.h>
41 * does not yet catch signals sent when the child dies.
42 * in exit.c or in signal.c.
46 * Called by kernel/ptrace.c when detaching..
48 * Make sure single step bits etc are not set.
50 void ptrace_disable(struct task_struct *child)
52 /* make sure the single step bit is not set. */
53 clear_single_step(child);
56 int sys_ptrace(long request, long pid, long addr, long data)
58 struct task_struct *child;
62 if (request == PTRACE_TRACEME) {
63 /* are we already being traced? */
64 if (current->ptrace & PT_PTRACED)
66 ret = security_ptrace(current->parent, current);
69 /* set the ptrace bit in the process flags. */
70 current->ptrace |= PT_PTRACED;
75 read_lock(&tasklist_lock);
76 child = find_task_by_pid(pid);
78 get_task_struct(child);
79 read_unlock(&tasklist_lock);
84 if (pid == 1) /* you may not mess with init */
87 if (request == PTRACE_ATTACH) {
88 ret = ptrace_attach(child);
92 ret = ptrace_check_attach(child, request == PTRACE_KILL);
97 /* when I and D space are separate, these will need to be fixed. */
98 case PTRACE_PEEKTEXT: /* read word at location addr. */
99 case PTRACE_PEEKDATA: {
103 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
105 if (copied != sizeof(tmp))
107 ret = put_user(tmp,(unsigned long __user *) data);
111 /* read the word at location addr in the USER area. */
112 case PTRACE_PEEKUSR: {
117 /* convert to index and check */
118 index = (unsigned long) addr >> 3;
119 if ((addr & 7) || (index > PT_FPSCR))
122 if (index < PT_FPR0) {
123 tmp = get_reg(child, (int)index);
125 flush_fp_to_thread(child);
126 tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0];
128 ret = put_user(tmp,(unsigned long __user *) data);
132 /* If 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)
142 /* write the word at location addr in the USER area */
143 case PTRACE_POKEUSR: {
147 /* convert to index and check */
148 index = (unsigned long) addr >> 3;
149 if ((addr & 7) || (index > PT_FPSCR))
152 if (index == PT_ORIG_R3)
154 if (index < PT_FPR0) {
155 ret = put_reg(child, index, data);
157 flush_fp_to_thread(child);
158 ((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data;
164 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
165 case PTRACE_CONT: { /* restart after signal. */
167 if (!valid_signal(data))
169 if (request == PTRACE_SYSCALL)
170 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
172 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
173 child->exit_code = data;
174 /* make sure the single step bit is not set. */
175 clear_single_step(child);
176 wake_up_process(child);
182 * make the child exit. Best I can do is send it a sigkill.
183 * perhaps it should be put in the status that it wants to
188 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
190 child->exit_code = SIGKILL;
191 /* make sure the single step bit is not set. */
192 clear_single_step(child);
193 wake_up_process(child);
197 case PTRACE_SINGLESTEP: { /* set the trap flag. */
199 if (!valid_signal(data))
201 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
202 set_single_step(child);
203 child->exit_code = data;
204 /* give it a chance to run. */
205 wake_up_process(child);
210 case PTRACE_GET_DEBUGREG: {
212 /* We only support one DABR and no IABRS at the moment */
215 ret = put_user(child->thread.dabr,
216 (unsigned long __user *)data);
220 case PTRACE_SET_DEBUGREG:
221 ret = ptrace_set_debugreg(child, addr, data);
224 ret = ptrace_detach(child, data);
227 case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
229 unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
230 unsigned long __user *tmp = (unsigned long __user *)addr;
232 for (i = 0; i < 32; i++) {
233 ret = put_user(*reg, tmp);
242 case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
244 unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
245 unsigned long __user *tmp = (unsigned long __user *)addr;
247 for (i = 0; i < 32; i++) {
248 ret = get_user(*reg, tmp);
257 case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
259 unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
260 unsigned long __user *tmp = (unsigned long __user *)addr;
262 flush_fp_to_thread(child);
264 for (i = 0; i < 32; i++) {
265 ret = put_user(*reg, tmp);
274 case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
276 unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
277 unsigned long __user *tmp = (unsigned long __user *)addr;
279 flush_fp_to_thread(child);
281 for (i = 0; i < 32; i++) {
282 ret = get_user(*reg, tmp);
291 #ifdef CONFIG_ALTIVEC
292 case PTRACE_GETVRREGS:
293 /* Get the child altivec register state. */
294 flush_altivec_to_thread(child);
295 ret = get_vrregs((unsigned long __user *)data, child);
298 case PTRACE_SETVRREGS:
299 /* Set the child altivec register state. */
300 flush_altivec_to_thread(child);
301 ret = set_vrregs(child, (unsigned long __user *)data);
306 ret = ptrace_request(child, request, addr, data);
310 put_task_struct(child);
316 static void do_syscall_trace(void)
318 /* the 0x80 provides a way for the tracing parent to distinguish
319 between a syscall stop and SIGTRAP delivery */
320 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
324 * this isn't the same as continuing with a signal, but it will do
325 * for normal use. strace only continues with a signal if the
326 * stopping signal is not SIGTRAP. -brl
328 if (current->exit_code) {
329 send_sig(current->exit_code, current, 1);
330 current->exit_code = 0;
334 void do_syscall_trace_enter(struct pt_regs *regs)
336 secure_computing(regs->gpr[0]);
338 if (test_thread_flag(TIF_SYSCALL_TRACE)
339 && (current->ptrace & PT_PTRACED))
342 if (unlikely(current->audit_context))
343 audit_syscall_entry(current,
344 test_thread_flag(TIF_32BIT)?AUDIT_ARCH_PPC:AUDIT_ARCH_PPC64,
346 regs->gpr[3], regs->gpr[4],
347 regs->gpr[5], regs->gpr[6]);
351 void do_syscall_trace_leave(struct pt_regs *regs)
353 if (unlikely(current->audit_context))
354 audit_syscall_exit(current,
355 (regs->ccr&0x1000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
358 if ((test_thread_flag(TIF_SYSCALL_TRACE)
359 || test_thread_flag(TIF_SINGLESTEP))
360 && (current->ptrace & PT_PTRACED))