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-rw-r--r--arch/tile/kernel/ptrace.c205
1 files changed, 205 insertions, 0 deletions
diff --git a/arch/tile/kernel/ptrace.c b/arch/tile/kernel/ptrace.c
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1/*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
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.
7 *
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
12 * more details.
13 *
14 * Copied from i386: Ross Biro 1/23/92
15 */
16
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>
23
24void user_enable_single_step(struct task_struct *child)
25{
26 set_tsk_thread_flag(child, TIF_SINGLESTEP);
27}
28
29void user_disable_single_step(struct task_struct *child)
30{
31 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
32}
33
34/*
35 * This routine will put a word on the process's privileged stack.
36 */
37static void putreg(struct task_struct *task,
38 unsigned long addr, unsigned long value)
39{
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;
44}
45
46static unsigned long getreg(struct task_struct *task, unsigned long addr)
47{
48 unsigned int regno = addr / sizeof(unsigned long);
49 struct pt_regs *childregs = task_pt_regs(task);
50 return childregs->regs[regno];
51}
52
53/*
54 * Called by kernel/ptrace.c when detaching..
55 */
56void ptrace_disable(struct task_struct *child)
57{
58 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
59
60 /*
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.
63 */
64 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
65}
66
67long arch_ptrace(struct task_struct *child, long request, long addr, long data)
68{
69 unsigned long __user *datap;
70 unsigned long tmp;
71 int i;
72 long ret = -EIO;
73
74#ifdef CONFIG_COMPAT
75 if (task_thread_info(current)->status & TS_COMPAT)
76 data = (u32)data;
77 if (task_thread_info(child)->status & TS_COMPAT)
78 addr = (u32)addr;
79#endif
80 datap = (unsigned long __user __force *)data;
81
82 switch (request) {
83
84 case PTRACE_PEEKUSR: /* Read register from pt_regs. */
85 if (addr & (sizeof(data)-1))
86 break;
87 if (addr < 0 || addr >= PTREGS_SIZE)
88 break;
89 tmp = getreg(child, addr); /* Read register */
90 ret = put_user(tmp, datap);
91 break;
92
93 case PTRACE_POKEUSR: /* Write register in pt_regs. */
94 if (addr & (sizeof(data)-1))
95 break;
96 if (addr < 0 || addr >= PTREGS_SIZE)
97 break;
98 putreg(child, addr, data); /* Write register */
99 ret = 0;
100 break;
101
102 case PTRACE_GETREGS: /* Get all registers from the child. */
103 if (!access_ok(VERIFY_WRITE, datap, PTREGS_SIZE))
104 break;
105 for (i = 0; i < PTREGS_SIZE; i += sizeof(long)) {
106 ret = __put_user(getreg(child, i), datap);
107 if (ret != 0)
108 break;
109 datap++;
110 }
111 break;
112
113 case PTRACE_SETREGS: /* Set all registers in the child. */
114 if (!access_ok(VERIFY_READ, datap, PTREGS_SIZE))
115 break;
116 for (i = 0; i < PTREGS_SIZE; i += sizeof(long)) {
117 ret = __get_user(tmp, datap);
118 if (ret != 0)
119 break;
120 putreg(child, i, tmp);
121 datap++;
122 }
123 break;
124
125 case PTRACE_GETFPREGS: /* Get the child FPU state. */
126 case PTRACE_SETFPREGS: /* Set the child FPU state. */
127 break;
128
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;
137 break;
138
139 default:
140#ifdef CONFIG_COMPAT
141 if (task_thread_info(current)->status & TS_COMPAT) {
142 ret = compat_ptrace_request(child, request,
143 addr, data);
144 break;
145 }
146#endif
147 ret = ptrace_request(child, request, addr, data);
148 break;
149 }
150
151 return ret;
152}
153
154#ifdef CONFIG_COMPAT
155/* Not used; we handle compat issues in arch_ptrace() directly. */
156long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
157 compat_ulong_t addr, compat_ulong_t data)
158{
159 BUG();
160}
161#endif
162
163void do_syscall_trace(void)
164{
165 if (!test_thread_flag(TIF_SYSCALL_TRACE))
166 return;
167
168 if (!(current->ptrace & PT_PTRACED))
169 return;
170
171 /*
172 * The 0x80 provides a way for the tracing parent to distinguish
173 * between a syscall stop and SIGTRAP delivery
174 */
175 ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
176
177 /*
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
181 */
182 if (current->exit_code) {
183 send_sig(current->exit_code, current, 1);
184 current->exit_code = 0;
185 }
186}
187
188void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
189{
190 struct siginfo info;
191
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;
196
197 /* Send us the fakey SIGTRAP */
198 force_sig_info(SIGTRAP, &info, tsk);
199}
200
201/* Handle synthetic interrupt delivered only by the simulator. */
202void __kprobes do_breakpoint(struct pt_regs* regs, int fault_num)
203{
204 send_sigtrap(current, regs, fault_num);
205}
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