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>
23 void user_enable_single_step(struct task_struct *child)
25 set_tsk_thread_flag(child, TIF_SINGLESTEP);
28 void user_disable_single_step(struct task_struct *child)
30 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
34 * This routine will put a word on the process's privileged stack.
36 static void putreg(struct task_struct *task,
37 unsigned long addr, unsigned long value)
39 unsigned int regno = addr / sizeof(unsigned long);
40 struct pt_regs *childregs = task_pt_regs(task);
41 childregs->regs[regno] = value;
42 childregs->flags |= PT_FLAGS_RESTORE_REGS;
45 static unsigned long getreg(struct task_struct *task, unsigned long addr)
47 unsigned int regno = addr / sizeof(unsigned long);
48 struct pt_regs *childregs = task_pt_regs(task);
49 return childregs->regs[regno];
53 * Called by kernel/ptrace.c when detaching..
55 void ptrace_disable(struct task_struct *child)
57 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
60 * These two are currently unused, but will be set by arch_ptrace()
61 * and used in the syscall assembly when we do support them.
63 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
66 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
68 unsigned long __user *datap;
74 if (task_thread_info(current)->status & TS_COMPAT)
76 if (task_thread_info(child)->status & TS_COMPAT)
79 datap = (unsigned long __user *)data;
83 case PTRACE_PEEKUSR: /* Read register from pt_regs. */
84 if (addr & (sizeof(data)-1))
86 if (addr < 0 || addr >= PTREGS_SIZE)
88 tmp = getreg(child, addr); /* Read register */
89 ret = put_user(tmp, datap);
92 case PTRACE_POKEUSR: /* Write register in pt_regs. */
93 if (addr & (sizeof(data)-1))
95 if (addr < 0 || addr >= PTREGS_SIZE)
97 putreg(child, addr, data); /* Write register */
100 case PTRACE_GETREGS: /* Get all registers from the child. */
101 if (!access_ok(VERIFY_WRITE, datap, PTREGS_SIZE))
103 for (i = 0; i < PTREGS_SIZE; i += sizeof(long)) {
104 ret = __put_user(getreg(child, i), datap);
111 case PTRACE_SETREGS: /* Set all registers in the child. */
112 if (!access_ok(VERIFY_READ, datap, PTREGS_SIZE))
114 for (i = 0; i < PTREGS_SIZE; i += sizeof(long)) {
115 ret = __get_user(tmp, datap);
118 putreg(child, i, tmp);
123 case PTRACE_GETFPREGS: /* Get the child FPU state. */
124 case PTRACE_SETFPREGS: /* Set the child FPU state. */
127 case PTRACE_SETOPTIONS:
128 /* Support TILE-specific ptrace options. */
129 child->ptrace &= ~PT_TRACE_MASK_TILE;
130 tmp = data & PTRACE_O_MASK_TILE;
131 data &= ~PTRACE_O_MASK_TILE;
132 ret = ptrace_request(child, request, addr, data);
133 if (tmp & PTRACE_O_TRACEMIGRATE)
134 child->ptrace |= PT_TRACE_MIGRATE;
139 if (task_thread_info(current)->status & TS_COMPAT) {
140 ret = compat_ptrace_request(child, request,
145 ret = ptrace_request(child, request, addr, data);
153 /* Not used; we handle compat issues in arch_ptrace() directly. */
154 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
155 compat_ulong_t addr, compat_ulong_t data)
161 void do_syscall_trace(void)
163 if (!test_thread_flag(TIF_SYSCALL_TRACE))
166 if (!(current->ptrace & PT_PTRACED))
170 * The 0x80 provides a way for the tracing parent to distinguish
171 * between a syscall stop and SIGTRAP delivery
173 ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
176 * this isn't the same as continuing with a signal, but it will do
177 * for normal use. strace only continues with a signal if the
178 * stopping signal is not SIGTRAP. -brl
180 if (current->exit_code) {
181 send_sig(current->exit_code, current, 1);
182 current->exit_code = 0;
186 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
190 memset(&info, 0, sizeof(info));
191 info.si_signo = SIGTRAP;
192 info.si_code = TRAP_BRKPT;
193 info.si_addr = (void __user *) regs->pc;
195 /* Send us the fakey SIGTRAP */
196 force_sig_info(SIGTRAP, &info, tsk);
199 /* Handle synthetic interrupt delivered only by the simulator. */
200 void __kprobes do_breakpoint(struct pt_regs* regs, int fault_num)
202 send_sigtrap(current, regs, fault_num);