1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
6 #include <linux/audit.h>
7 #include <linux/ptrace.h>
8 #include <linux/sched.h>
9 #include <linux/tracehook.h>
10 #include <linux/uaccess.h>
11 #include <asm/ptrace-abi.h>
13 void user_enable_single_step(struct task_struct *child)
15 set_tsk_thread_flag(child, TIF_SINGLESTEP);
16 child->thread.singlestep_syscall = 0;
18 #ifdef SUBARCH_SET_SINGLESTEPPING
19 SUBARCH_SET_SINGLESTEPPING(child, 1);
23 void user_disable_single_step(struct task_struct *child)
25 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
26 child->thread.singlestep_syscall = 0;
28 #ifdef SUBARCH_SET_SINGLESTEPPING
29 SUBARCH_SET_SINGLESTEPPING(child, 0);
34 * Called by kernel/ptrace.c when detaching..
36 void ptrace_disable(struct task_struct *child)
38 user_disable_single_step(child);
41 extern int peek_user(struct task_struct * child, long addr, long data);
42 extern int poke_user(struct task_struct * child, long addr, long data);
44 long arch_ptrace(struct task_struct *child, long request,
45 unsigned long addr, unsigned long data)
48 unsigned long __user *p = (void __user *)data;
52 /* read the word at location addr in the USER area. */
54 ret = peek_user(child, addr, data);
57 /* write the word at location addr in the USER area */
59 ret = poke_user(child, addr, data);
63 case PTRACE_SYSEMU_SINGLESTEP:
68 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
69 if (!access_ok(p, MAX_REG_OFFSET)) {
73 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
74 __put_user(getreg(child, i), p);
82 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
83 unsigned long tmp = 0;
84 if (!access_ok(p, MAX_REG_OFFSET)) {
88 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
90 putreg(child, i, tmp);
97 case PTRACE_GET_THREAD_AREA:
98 ret = ptrace_get_thread_area(child, addr, vp);
101 case PTRACE_SET_THREAD_AREA:
102 ret = ptrace_set_thread_area(child, addr, vp);
106 ret = ptrace_request(child, request, addr, data);
108 ret = subarch_ptrace(child, request, addr, data);
115 static void send_sigtrap(struct uml_pt_regs *regs, int error_code)
117 /* Send us the fake SIGTRAP */
118 force_sig_fault(SIGTRAP, TRAP_BRKPT,
120 UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL);
124 * XXX Check TIF_SINGLESTEP for singlestepping check and
125 * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
127 int syscall_trace_enter(struct pt_regs *regs)
129 audit_syscall_entry(UPT_SYSCALL_NR(®s->regs),
130 UPT_SYSCALL_ARG1(®s->regs),
131 UPT_SYSCALL_ARG2(®s->regs),
132 UPT_SYSCALL_ARG3(®s->regs),
133 UPT_SYSCALL_ARG4(®s->regs));
135 if (!test_thread_flag(TIF_SYSCALL_TRACE))
138 return tracehook_report_syscall_entry(regs);
141 void syscall_trace_leave(struct pt_regs *regs)
143 int ptraced = current->ptrace;
145 audit_syscall_exit(regs);
147 /* Fake a debug trap */
148 if (test_thread_flag(TIF_SINGLESTEP))
149 send_sigtrap(®s->regs, 0);
151 if (!test_thread_flag(TIF_SYSCALL_TRACE))
154 tracehook_report_syscall_exit(regs, 0);
155 /* force do_signal() --> is_syscall() */
156 if (ptraced & PT_PTRACED)
157 set_thread_flag(TIF_SIGPENDING);