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 static inline void set_singlestepping(struct task_struct *child, int on)
26 child->ptrace |= PT_DTRACE;
28 child->ptrace &= ~PT_DTRACE;
29 child->thread.singlestep_syscall = 0;
31 #ifdef SUBARCH_SET_SINGLESTEPPING
32 SUBARCH_SET_SINGLESTEPPING(child, on);
37 * Called by kernel/ptrace.c when detaching..
39 void ptrace_disable(struct task_struct *child)
41 set_singlestepping(child,0);
44 extern int peek_user(struct task_struct * child, long addr, long data);
45 extern int poke_user(struct task_struct * child, long addr, long data);
47 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
50 unsigned long __user *p = (void __user *)(unsigned long)data;
53 /* when I and D space are separate, these will need to be fixed. */
54 case PTRACE_PEEKTEXT: /* read word at location addr. */
56 ret = generic_ptrace_peekdata(child, addr, data);
59 /* read the word at location addr in the USER area. */
61 ret = peek_user(child, addr, data);
64 /* when I and D space are separate, this will have to be fixed. */
65 case PTRACE_POKETEXT: /* write the word at location addr. */
67 ret = generic_ptrace_pokedata(child, addr, data);
70 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
71 ret = poke_user(child, addr, data);
74 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
75 case PTRACE_CONT: { /* restart after signal. */
77 if (!valid_signal(data))
80 set_singlestepping(child, 0);
81 if (request == PTRACE_SYSCALL) {
82 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
85 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
87 child->exit_code = data;
88 wake_up_process(child);
94 * make the child exit. Best I can do is send it a sigkill.
95 * perhaps it should be put in the status that it wants to
100 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
103 set_singlestepping(child, 0);
104 child->exit_code = SIGKILL;
105 wake_up_process(child);
109 case PTRACE_SINGLESTEP: { /* set the trap flag. */
111 if (!valid_signal(data))
113 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
114 set_singlestepping(child, 1);
115 child->exit_code = data;
116 /* give it a chance to run. */
117 wake_up_process(child);
122 #ifdef PTRACE_GETREGS
123 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
124 if (!access_ok(VERIFY_WRITE, p, MAX_REG_OFFSET)) {
128 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
129 __put_user(getreg(child, i), p);
136 #ifdef PTRACE_SETREGS
137 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
138 unsigned long tmp = 0;
139 if (!access_ok(VERIFY_READ, p, MAX_REG_OFFSET)) {
143 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
145 putreg(child, i, tmp);
152 #ifdef PTRACE_GETFPREGS
153 case PTRACE_GETFPREGS: /* Get the child FPU state. */
154 ret = get_fpregs(data, child);
157 #ifdef PTRACE_SETFPREGS
158 case PTRACE_SETFPREGS: /* Set the child FPU state. */
159 ret = set_fpregs(data, child);
162 #ifdef PTRACE_GETFPXREGS
163 case PTRACE_GETFPXREGS: /* Get the child FPU state. */
164 ret = get_fpxregs(data, child);
167 #ifdef PTRACE_SETFPXREGS
168 case PTRACE_SETFPXREGS: /* Set the child FPU state. */
169 ret = set_fpxregs(data, child);
172 case PTRACE_GET_THREAD_AREA:
173 ret = ptrace_get_thread_area(child, addr,
174 (struct user_desc __user *) data);
177 case PTRACE_SET_THREAD_AREA:
178 ret = ptrace_set_thread_area(child, addr,
179 (struct user_desc __user *) data);
182 case PTRACE_FAULTINFO: {
183 /* Take the info from thread->arch->faultinfo,
184 * but transfer max. sizeof(struct ptrace_faultinfo).
185 * On i386, ptrace_faultinfo is smaller!
187 ret = copy_to_user(p, &child->thread.arch.faultinfo,
188 sizeof(struct ptrace_faultinfo));
196 struct ptrace_ldt ldt;
198 if(copy_from_user(&ldt, p, sizeof(ldt))){
203 /* This one is confusing, so just punt and return -EIO for
210 #ifdef CONFIG_PROC_MM
211 case PTRACE_SWITCH_MM: {
212 struct mm_struct *old = child->mm;
213 struct mm_struct *new = proc_mm_get_mm(data);
220 atomic_inc(&new->mm_users);
222 child->active_mm = new;
228 #ifdef PTRACE_ARCH_PRCTL
229 case PTRACE_ARCH_PRCTL:
230 /* XXX Calls ptrace on the host - needs some SMP thinking */
231 ret = arch_prctl_skas(child, data, (void *) addr);
235 ret = ptrace_request(child, request, addr, data);
242 void send_sigtrap(struct task_struct *tsk, union uml_pt_regs *regs,
247 memset(&info, 0, sizeof(info));
248 info.si_signo = SIGTRAP;
249 info.si_code = TRAP_BRKPT;
252 info.si_addr = UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL;
254 /* Send us the fakey SIGTRAP */
255 force_sig_info(SIGTRAP, &info, tsk);
258 /* XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
259 * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
261 void syscall_trace(union uml_pt_regs *regs, int entryexit)
263 int is_singlestep = (current->ptrace & PT_DTRACE) && entryexit;
266 if (unlikely(current->audit_context)) {
268 audit_syscall_entry(HOST_AUDIT_ARCH,
269 UPT_SYSCALL_NR(regs),
270 UPT_SYSCALL_ARG1(regs),
271 UPT_SYSCALL_ARG2(regs),
272 UPT_SYSCALL_ARG3(regs),
273 UPT_SYSCALL_ARG4(regs));
274 else audit_syscall_exit(AUDITSC_RESULT(UPT_SYSCALL_RET(regs)),
275 UPT_SYSCALL_RET(regs));
278 /* Fake a debug trap */
280 send_sigtrap(current, regs, 0);
282 if (!test_thread_flag(TIF_SYSCALL_TRACE))
285 if (!(current->ptrace & PT_PTRACED))
288 /* the 0x80 provides a way for the tracing parent to distinguish
289 between a syscall stop and SIGTRAP delivery */
290 tracesysgood = (current->ptrace & PT_TRACESYSGOOD);
291 ptrace_notify(SIGTRAP | (tracesysgood ? 0x80 : 0));
293 if (entryexit) /* force do_signal() --> is_syscall() */
294 set_thread_flag(TIF_SIGPENDING);
296 /* this isn't the same as continuing with a signal, but it will do
297 * for normal use. strace only continues with a signal if the
298 * stopping signal is not SIGTRAP. -brl
300 if (current->exit_code) {
301 send_sig(current->exit_code, current, 1);
302 current->exit_code = 0;