2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
14 * Copied from i386: Ross Biro 1/23/92
17 #include <linux/kernel.h>
18 #include <linux/ptrace.h>
19 #include <linux/kprobes.h>
20 #include <linux/compat.h>
21 #include <linux/uaccess.h>
22 #include <asm/traps.h>
24 void user_enable_single_step(struct task_struct *child)
26 set_tsk_thread_flag(child, TIF_SINGLESTEP);
29 void user_disable_single_step(struct task_struct *child)
31 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
35 * Called by kernel/ptrace.c when detaching..
37 void ptrace_disable(struct task_struct *child)
39 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
42 * These two are currently unused, but will be set by arch_ptrace()
43 * and used in the syscall assembly when we do support them.
45 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
48 long arch_ptrace(struct task_struct *child, long request,
49 unsigned long addr, unsigned long data)
51 unsigned long __user *datap = (long __user __force *)data;
55 unsigned long *childregs;
60 case PTRACE_PEEKUSR: /* Read register from pt_regs. */
61 if (addr >= PTREGS_SIZE)
63 childreg = (char *)task_pt_regs(child) + addr;
65 if (is_compat_task()) {
66 if (addr & (sizeof(compat_long_t)-1))
68 ret = put_user(*(compat_long_t *)childreg,
69 (compat_long_t __user *)datap);
73 if (addr & (sizeof(long)-1))
75 ret = put_user(*(long *)childreg, datap);
79 case PTRACE_POKEUSR: /* Write register in pt_regs. */
80 if (addr >= PTREGS_SIZE)
82 childreg = (char *)task_pt_regs(child) + addr;
84 if (is_compat_task()) {
85 if (addr & (sizeof(compat_long_t)-1))
87 *(compat_long_t *)childreg = data;
91 if (addr & (sizeof(long)-1))
93 *(long *)childreg = data;
98 case PTRACE_GETREGS: /* Get all registers from the child. */
99 if (!access_ok(VERIFY_WRITE, datap, PTREGS_SIZE))
101 childregs = (long *)task_pt_regs(child);
102 for (i = 0; i < sizeof(struct pt_regs)/sizeof(unsigned long);
104 ret = __put_user(childregs[i], &datap[i]);
110 case PTRACE_SETREGS: /* Set all registers in the child. */
111 if (!access_ok(VERIFY_READ, datap, PTREGS_SIZE))
113 childregs = (long *)task_pt_regs(child);
114 for (i = 0; i < sizeof(struct pt_regs)/sizeof(unsigned long);
116 ret = __get_user(childregs[i], &datap[i]);
122 case PTRACE_GETFPREGS: /* Get the child FPU state. */
123 case PTRACE_SETFPREGS: /* Set the child FPU state. */
126 case PTRACE_SETOPTIONS:
127 /* Support TILE-specific ptrace options. */
128 child->ptrace &= ~PT_TRACE_MASK_TILE;
129 tmp = data & PTRACE_O_MASK_TILE;
130 data &= ~PTRACE_O_MASK_TILE;
131 ret = ptrace_request(child, request, addr, data);
132 if (tmp & PTRACE_O_TRACEMIGRATE)
133 child->ptrace |= PT_TRACE_MIGRATE;
138 if (task_thread_info(current)->status & TS_COMPAT) {
139 ret = compat_ptrace_request(child, request,
144 ret = ptrace_request(child, request, addr, data);
152 /* Not used; we handle compat issues in arch_ptrace() directly. */
153 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
154 compat_ulong_t addr, compat_ulong_t data)
160 void do_syscall_trace(void)
162 if (!test_thread_flag(TIF_SYSCALL_TRACE))
165 if (!(current->ptrace & PT_PTRACED))
169 * The 0x80 provides a way for the tracing parent to distinguish
170 * between a syscall stop and SIGTRAP delivery
172 ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
175 * this isn't the same as continuing with a signal, but it will do
176 * for normal use. strace only continues with a signal if the
177 * stopping signal is not SIGTRAP. -brl
179 if (current->exit_code) {
180 send_sig(current->exit_code, current, 1);
181 current->exit_code = 0;
185 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
189 memset(&info, 0, sizeof(info));
190 info.si_signo = SIGTRAP;
191 info.si_code = TRAP_BRKPT;
192 info.si_addr = (void __user *) regs->pc;
194 /* Send us the fakey SIGTRAP */
195 force_sig_info(SIGTRAP, &info, tsk);
198 /* Handle synthetic interrupt delivered only by the simulator. */
199 void __kprobes do_breakpoint(struct pt_regs* regs, int fault_num)
201 send_sigtrap(current, regs, fault_num);