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 <linux/tracehook.h>
10 #include <asm/uaccess.h>
12 void user_enable_single_step(struct task_struct *child)
14 child->ptrace |= PT_DTRACE;
15 child->thread.singlestep_syscall = 0;
17 #ifdef SUBARCH_SET_SINGLESTEPPING
18 SUBARCH_SET_SINGLESTEPPING(child, 1);
22 void user_disable_single_step(struct task_struct *child)
24 child->ptrace &= ~PT_DTRACE;
25 child->thread.singlestep_syscall = 0;
27 #ifdef SUBARCH_SET_SINGLESTEPPING
28 SUBARCH_SET_SINGLESTEPPING(child, 0);
33 * Called by kernel/ptrace.c when detaching..
35 void ptrace_disable(struct task_struct *child)
37 user_disable_single_step(child);
40 extern int peek_user(struct task_struct * child, long addr, long data);
41 extern int poke_user(struct task_struct * child, long addr, long data);
43 long arch_ptrace(struct task_struct *child, long request,
44 unsigned long addr, unsigned long data)
47 unsigned long __user *p = (void __user *)data;
51 /* read the word at location addr in the USER area. */
53 ret = peek_user(child, addr, data);
56 /* write the word at location addr in the USER area */
58 ret = poke_user(child, addr, data);
62 case PTRACE_SYSEMU_SINGLESTEP:
67 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
68 if (!access_ok(VERIFY_WRITE, p, MAX_REG_OFFSET)) {
72 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
73 __put_user(getreg(child, i), p);
81 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
82 unsigned long tmp = 0;
83 if (!access_ok(VERIFY_READ, p, MAX_REG_OFFSET)) {
87 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
89 putreg(child, i, tmp);
96 case PTRACE_GET_THREAD_AREA:
97 ret = ptrace_get_thread_area(child, addr, vp);
100 case PTRACE_SET_THREAD_AREA:
101 ret = ptrace_set_thread_area(child, addr, vp);
105 ret = ptrace_request(child, request, addr, data);
107 ret = subarch_ptrace(child, request, addr, data);
114 static void send_sigtrap(struct task_struct *tsk, struct uml_pt_regs *regs,
119 memset(&info, 0, sizeof(info));
120 info.si_signo = SIGTRAP;
121 info.si_code = TRAP_BRKPT;
124 info.si_addr = UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL;
126 /* Send us the fake SIGTRAP */
127 force_sig_info(SIGTRAP, &info, tsk);
131 * XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
132 * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
134 void syscall_trace_enter(struct pt_regs *regs)
136 audit_syscall_entry(UPT_SYSCALL_NR(®s->regs),
137 UPT_SYSCALL_ARG1(®s->regs),
138 UPT_SYSCALL_ARG2(®s->regs),
139 UPT_SYSCALL_ARG3(®s->regs),
140 UPT_SYSCALL_ARG4(®s->regs));
142 if (!test_thread_flag(TIF_SYSCALL_TRACE))
145 tracehook_report_syscall_entry(regs);
148 void syscall_trace_leave(struct pt_regs *regs)
150 int ptraced = current->ptrace;
152 audit_syscall_exit(regs);
154 /* Fake a debug trap */
155 if (ptraced & PT_DTRACE)
156 send_sigtrap(current, ®s->regs, 0);
158 if (!test_thread_flag(TIF_SYSCALL_TRACE))
161 tracehook_report_syscall_exit(regs, 0);
162 /* force do_signal() --> is_syscall() */
163 if (ptraced & PT_PTRACED)
164 set_thread_flag(TIF_SIGPENDING);