2 * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
6 #include "linux/sched.h"
8 #include "linux/errno.h"
9 #include "linux/smp_lock.h"
10 #include "linux/security.h"
11 #include "linux/ptrace.h"
12 #include "linux/audit.h"
14 #include "linux/proc_mm.h"
16 #include "asm/ptrace.h"
17 #include "asm/uaccess.h"
18 #include "kern_util.h"
19 #include "skas_ptrace.h"
20 #include "sysdep/ptrace.h"
23 * Called by kernel/ptrace.c when detaching..
25 void ptrace_disable(struct task_struct *child)
27 child->ptrace &= ~PT_DTRACE;
28 child->thread.singlestep_syscall = 0;
31 long sys_ptrace(long request, long pid, long addr, long data)
33 struct task_struct *child;
38 if (request == PTRACE_TRACEME) {
39 /* are we already being traced? */
40 if (current->ptrace & PT_PTRACED)
43 ret = security_ptrace(current->parent, current);
47 /* set the ptrace bit in the process flags. */
48 current->ptrace |= PT_PTRACED;
53 read_lock(&tasklist_lock);
54 child = find_task_by_pid(pid);
56 get_task_struct(child);
57 read_unlock(&tasklist_lock);
62 if (pid == 1) /* you may not mess with init */
65 if (request == PTRACE_ATTACH) {
66 ret = ptrace_attach(child);
70 ret = ptrace_check_attach(child, request == PTRACE_KILL);
75 /* when I and D space are separate, these will need to be fixed. */
76 case PTRACE_PEEKTEXT: /* read word at location addr. */
77 case PTRACE_PEEKDATA: {
82 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
83 if (copied != sizeof(tmp))
85 ret = put_user(tmp, (unsigned long __user *) data);
89 /* read the word at location addr in the USER area. */
90 case PTRACE_PEEKUSR: {
94 if ((addr & 3) || addr < 0)
97 tmp = 0; /* Default return condition */
98 if(addr < MAX_REG_OFFSET){
99 tmp = getreg(child, addr);
101 else if((addr >= offsetof(struct user, u_debugreg[0])) &&
102 (addr <= offsetof(struct user, u_debugreg[7]))){
103 addr -= offsetof(struct user, u_debugreg[0]);
105 tmp = child->thread.arch.debugregs[addr];
107 ret = put_user(tmp, (unsigned long __user *) data);
111 /* when I and D space are separate, this will have to be fixed. */
112 case PTRACE_POKETEXT: /* write the word at location addr. */
113 case PTRACE_POKEDATA:
115 if (access_process_vm(child, addr, &data, sizeof(data),
121 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
123 if ((addr & 3) || addr < 0)
126 if (addr < MAX_REG_OFFSET) {
127 ret = putreg(child, addr, data);
130 #if 0 /* XXX x86_64 */
131 else if((addr >= offsetof(struct user, u_debugreg[0])) &&
132 (addr <= offsetof(struct user, u_debugreg[7]))){
133 addr -= offsetof(struct user, u_debugreg[0]);
135 if((addr == 4) || (addr == 5)) break;
136 child->thread.arch.debugregs[addr] = data;
143 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
144 case PTRACE_CONT: { /* restart after signal. */
146 if ((unsigned long) data > _NSIG)
149 child->ptrace &= ~PT_DTRACE;
150 child->thread.singlestep_syscall = 0;
151 if (request == PTRACE_SYSCALL) {
152 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
155 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
157 child->exit_code = data;
158 wake_up_process(child);
164 * make the child exit. Best I can do is send it a sigkill.
165 * perhaps it should be put in the status that it wants to
170 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
173 child->ptrace &= ~PT_DTRACE;
174 child->thread.singlestep_syscall = 0;
175 child->exit_code = SIGKILL;
176 wake_up_process(child);
180 case PTRACE_SINGLESTEP: { /* set the trap flag. */
182 if ((unsigned long) data > _NSIG)
184 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
185 child->ptrace |= PT_DTRACE;
186 child->thread.singlestep_syscall = 0;
187 child->exit_code = data;
188 /* give it a chance to run. */
189 wake_up_process(child);
195 /* detach a process that was attached. */
196 ret = ptrace_detach(child, data);
199 #ifdef PTRACE_GETREGS
200 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
201 if (!access_ok(VERIFY_WRITE, (unsigned long *)data,
206 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
207 __put_user(getreg(child, i),
208 (unsigned long __user *) data);
209 data += sizeof(long);
215 #ifdef PTRACE_SETREGS
216 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
217 unsigned long tmp = 0;
218 if (!access_ok(VERIFY_READ, (unsigned *)data,
223 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
224 __get_user(tmp, (unsigned long __user *) data);
225 putreg(child, i, tmp);
226 data += sizeof(long);
232 #ifdef PTRACE_GETFPREGS
233 case PTRACE_GETFPREGS: /* Get the child FPU state. */
234 ret = get_fpregs(data, child);
237 #ifdef PTRACE_SETFPREGS
238 case PTRACE_SETFPREGS: /* Set the child FPU state. */
239 ret = set_fpregs(data, child);
242 #ifdef PTRACE_GETFPXREGS
243 case PTRACE_GETFPXREGS: /* Get the child FPU state. */
244 ret = get_fpxregs(data, child);
247 #ifdef PTRACE_SETFPXREGS
248 case PTRACE_SETFPXREGS: /* Set the child FPU state. */
249 ret = set_fpxregs(data, child);
252 case PTRACE_FAULTINFO: {
253 struct ptrace_faultinfo fault;
255 fault = ((struct ptrace_faultinfo)
256 { .is_write = child->thread.err,
257 .addr = child->thread.cr2 });
258 ret = copy_to_user((unsigned long __user *) data, &fault,
264 case PTRACE_SIGPENDING:
265 ret = copy_to_user((unsigned long __user *) data,
266 &child->pending.signal,
267 sizeof(child->pending.signal));
271 struct ptrace_ldt ldt;
273 if(copy_from_user(&ldt, (unsigned long __user *) data,
279 /* This one is confusing, so just punt and return -EIO for
285 #ifdef CONFIG_PROC_MM
286 case PTRACE_SWITCH_MM: {
287 struct mm_struct *old = child->mm;
288 struct mm_struct *new = proc_mm_get_mm(data);
295 atomic_inc(&new->mm_users);
297 child->active_mm = new;
304 ret = ptrace_request(child, request, addr, data);
308 put_task_struct(child);
314 void send_sigtrap(struct task_struct *tsk, union uml_pt_regs *regs,
319 memset(&info, 0, sizeof(info));
320 info.si_signo = SIGTRAP;
321 info.si_code = TRAP_BRKPT;
324 info.si_addr = UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL;
326 /* Send us the fakey SIGTRAP */
327 force_sig_info(SIGTRAP, &info, tsk);
330 /* XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
331 * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
333 void syscall_trace(union uml_pt_regs *regs, int entryexit)
335 int is_singlestep = (current->ptrace & PT_DTRACE) && entryexit;
338 if (unlikely(current->audit_context)) {
340 audit_syscall_entry(current,
341 UPT_SYSCALL_NR(®s->regs),
342 UPT_SYSCALL_ARG1(®s->regs),
343 UPT_SYSCALL_ARG2(®s->regs),
344 UPT_SYSCALL_ARG3(®s->regs),
345 UPT_SYSCALL_ARG4(®s->regs));
347 audit_syscall_exit(current,
348 UPT_SYSCALL_RET(®s->regs));
351 /* Fake a debug trap */
353 send_sigtrap(current, regs, 0);
355 if (!test_thread_flag(TIF_SYSCALL_TRACE))
358 if (!(current->ptrace & PT_PTRACED))
361 /* the 0x80 provides a way for the tracing parent to distinguish
362 between a syscall stop and SIGTRAP delivery */
363 tracesysgood = (current->ptrace & PT_TRACESYSGOOD);
364 ptrace_notify(SIGTRAP | (tracesysgood ? 0x80 : 0));
366 if (entryexit) /* force do_signal() --> is_syscall() */
367 set_thread_flag(TIF_SIGPENDING);
369 /* this isn't the same as continuing with a signal, but it will do
370 * for normal use. strace only continues with a signal if the
371 * stopping signal is not SIGTRAP. -brl
373 if (current->exit_code) {
374 send_sig(current->exit_code, current, 1);
375 current->exit_code = 0;
380 * Overrides for Emacs so that we follow Linus's tabbing style.
381 * Emacs will notice this stuff at the end of the file and automatically
382 * adjust the settings for this buffer only. This must remain at the end
384 * ---------------------------------------------------------------------------
386 * c-file-style: "linux"