2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
6 #include "linux/audit.h"
7 #include "linux/ptrace.h"
8 #include "linux/sched.h"
9 #include "asm/uaccess.h"
10 #include "skas_ptrace.h"
14 void user_enable_single_step(struct task_struct *child)
16 child->ptrace |= PT_DTRACE;
17 child->thread.singlestep_syscall = 0;
19 #ifdef SUBARCH_SET_SINGLESTEPPING
20 SUBARCH_SET_SINGLESTEPPING(child, 1);
24 void user_disable_single_step(struct task_struct *child)
26 child->ptrace &= ~PT_DTRACE;
27 child->thread.singlestep_syscall = 0;
29 #ifdef SUBARCH_SET_SINGLESTEPPING
30 SUBARCH_SET_SINGLESTEPPING(child, 0);
35 * Called by kernel/ptrace.c when detaching..
37 void ptrace_disable(struct task_struct *child)
39 user_disable_single_step(child);
42 extern int peek_user(struct task_struct * child, long addr, long data);
43 extern int poke_user(struct task_struct * child, long addr, long data);
45 long arch_ptrace(struct task_struct *child, long request,
46 unsigned long addr, unsigned long data)
49 unsigned long __user *p = (void __user *)data;
52 /* read word at location addr. */
55 ret = generic_ptrace_peekdata(child, addr, data);
58 /* read the word at location addr in the USER area. */
60 ret = peek_user(child, addr, data);
63 /* write the word at location addr. */
66 ret = generic_ptrace_pokedata(child, addr, data);
69 /* write the word at location addr in the USER area */
71 ret = poke_user(child, addr, data);
75 case PTRACE_SYSEMU_SINGLESTEP:
80 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
81 if (!access_ok(VERIFY_WRITE, p, MAX_REG_OFFSET)) {
85 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
86 __put_user(getreg(child, i), p);
94 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
95 unsigned long tmp = 0;
96 if (!access_ok(VERIFY_READ, p, MAX_REG_OFFSET)) {
100 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
102 putreg(child, i, tmp);
109 #ifdef PTRACE_GETFPREGS
110 case PTRACE_GETFPREGS: /* Get the child FPU state. */
111 ret = get_fpregs((struct user_i387_struct __user *) data,
115 #ifdef PTRACE_SETFPREGS
116 case PTRACE_SETFPREGS: /* Set the child FPU state. */
117 ret = set_fpregs((struct user_i387_struct __user *) data,
121 case PTRACE_GET_THREAD_AREA:
122 ret = ptrace_get_thread_area(child, addr,
123 (struct user_desc __user *) data);
126 case PTRACE_SET_THREAD_AREA:
127 ret = ptrace_set_thread_area(child, addr,
128 (struct user_desc __user *) data);
131 case PTRACE_FAULTINFO: {
133 * Take the info from thread->arch->faultinfo,
134 * but transfer max. sizeof(struct ptrace_faultinfo).
135 * On i386, ptrace_faultinfo is smaller!
137 ret = copy_to_user(p, &child->thread.arch.faultinfo,
138 sizeof(struct ptrace_faultinfo));
144 struct ptrace_ldt ldt;
146 if (copy_from_user(&ldt, p, sizeof(ldt))) {
152 * This one is confusing, so just punt and return -EIO for
159 #ifdef PTRACE_ARCH_PRCTL
160 case PTRACE_ARCH_PRCTL:
161 /* XXX Calls ptrace on the host - needs some SMP thinking */
162 ret = arch_prctl(child, data, (void *) addr);
166 ret = ptrace_request(child, request, addr, data);
168 ret = subarch_ptrace(child, request, addr, data);
175 static void send_sigtrap(struct task_struct *tsk, struct uml_pt_regs *regs,
180 memset(&info, 0, sizeof(info));
181 info.si_signo = SIGTRAP;
182 info.si_code = TRAP_BRKPT;
185 info.si_addr = UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL;
187 /* Send us the fake SIGTRAP */
188 force_sig_info(SIGTRAP, &info, tsk);
192 * XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
193 * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
195 void syscall_trace(struct uml_pt_regs *regs, int entryexit)
197 int is_singlestep = (current->ptrace & PT_DTRACE) && entryexit;
200 if (unlikely(current->audit_context)) {
202 audit_syscall_entry(HOST_AUDIT_ARCH,
203 UPT_SYSCALL_NR(regs),
204 UPT_SYSCALL_ARG1(regs),
205 UPT_SYSCALL_ARG2(regs),
206 UPT_SYSCALL_ARG3(regs),
207 UPT_SYSCALL_ARG4(regs));
208 else audit_syscall_exit(AUDITSC_RESULT(UPT_SYSCALL_RET(regs)),
209 UPT_SYSCALL_RET(regs));
212 /* Fake a debug trap */
214 send_sigtrap(current, regs, 0);
216 if (!test_thread_flag(TIF_SYSCALL_TRACE))
219 if (!(current->ptrace & PT_PTRACED))
223 * the 0x80 provides a way for the tracing parent to distinguish
224 * between a syscall stop and SIGTRAP delivery
226 tracesysgood = (current->ptrace & PT_TRACESYSGOOD);
227 ptrace_notify(SIGTRAP | (tracesysgood ? 0x80 : 0));
229 if (entryexit) /* force do_signal() --> is_syscall() */
230 set_thread_flag(TIF_SIGPENDING);
233 * this isn't the same as continuing with a signal, but it will do
234 * for normal use. strace only continues with a signal if the
235 * stopping signal is not SIGTRAP. -brl
237 if (current->exit_code) {
238 send_sig(current->exit_code, current, 1);
239 current->exit_code = 0;