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 * This routine will put a word on the process's privileged stack.
37 static void putreg(struct task_struct *task,
38 unsigned long addr, unsigned long value)
40 unsigned int regno = addr / sizeof(unsigned long);
41 struct pt_regs *childregs = task_pt_regs(task);
42 childregs->regs[regno] = value;
43 childregs->flags |= PT_FLAGS_RESTORE_REGS;
46 static unsigned long getreg(struct task_struct *task, unsigned long addr)
48 unsigned int regno = addr / sizeof(unsigned long);
49 struct pt_regs *childregs = task_pt_regs(task);
50 return childregs->regs[regno];
54 * Called by kernel/ptrace.c when detaching..
56 void ptrace_disable(struct task_struct *child)
58 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
61 * These two are currently unused, but will be set by arch_ptrace()
62 * and used in the syscall assembly when we do support them.
64 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
67 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
69 unsigned long __user *datap;
75 if (task_thread_info(current)->status & TS_COMPAT)
77 if (task_thread_info(child)->status & TS_COMPAT)
80 datap = (unsigned long __user __force *)data;
84 case PTRACE_PEEKUSR: /* Read register from pt_regs. */
85 if (addr & (sizeof(data)-1))
87 if (addr < 0 || addr >= PTREGS_SIZE)
89 tmp = getreg(child, addr); /* Read register */
90 ret = put_user(tmp, datap);
93 case PTRACE_POKEUSR: /* Write register in pt_regs. */
94 if (addr & (sizeof(data)-1))
96 if (addr < 0 || addr >= PTREGS_SIZE)
98 putreg(child, addr, data); /* Write register */
102 case PTRACE_GETREGS: /* Get all registers from the child. */
103 if (!access_ok(VERIFY_WRITE, datap, PTREGS_SIZE))
105 for (i = 0; i < PTREGS_SIZE; i += sizeof(long)) {
106 ret = __put_user(getreg(child, i), datap);
113 case PTRACE_SETREGS: /* Set all registers in the child. */
114 if (!access_ok(VERIFY_READ, datap, PTREGS_SIZE))
116 for (i = 0; i < PTREGS_SIZE; i += sizeof(long)) {
117 ret = __get_user(tmp, datap);
120 putreg(child, i, tmp);
125 case PTRACE_GETFPREGS: /* Get the child FPU state. */
126 case PTRACE_SETFPREGS: /* Set the child FPU state. */
129 case PTRACE_SETOPTIONS:
130 /* Support TILE-specific ptrace options. */
131 child->ptrace &= ~PT_TRACE_MASK_TILE;
132 tmp = data & PTRACE_O_MASK_TILE;
133 data &= ~PTRACE_O_MASK_TILE;
134 ret = ptrace_request(child, request, addr, data);
135 if (tmp & PTRACE_O_TRACEMIGRATE)
136 child->ptrace |= PT_TRACE_MIGRATE;
141 if (task_thread_info(current)->status & TS_COMPAT) {
142 ret = compat_ptrace_request(child, request,
147 ret = ptrace_request(child, request, addr, data);
155 /* Not used; we handle compat issues in arch_ptrace() directly. */
156 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
157 compat_ulong_t addr, compat_ulong_t data)
163 void do_syscall_trace(void)
165 if (!test_thread_flag(TIF_SYSCALL_TRACE))
168 if (!(current->ptrace & PT_PTRACED))
172 * The 0x80 provides a way for the tracing parent to distinguish
173 * between a syscall stop and SIGTRAP delivery
175 ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
178 * this isn't the same as continuing with a signal, but it will do
179 * for normal use. strace only continues with a signal if the
180 * stopping signal is not SIGTRAP. -brl
182 if (current->exit_code) {
183 send_sig(current->exit_code, current, 1);
184 current->exit_code = 0;
188 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
192 memset(&info, 0, sizeof(info));
193 info.si_signo = SIGTRAP;
194 info.si_code = TRAP_BRKPT;
195 info.si_addr = (void __user *) regs->pc;
197 /* Send us the fakey SIGTRAP */
198 force_sig_info(SIGTRAP, &info, tsk);
201 /* Handle synthetic interrupt delivered only by the simulator. */
202 void __kprobes do_breakpoint(struct pt_regs* regs, int fault_num)
204 send_sigtrap(current, regs, fault_num);