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-rw-r--r--arch/sh/kernel/ptrace_32.c287
1 files changed, 287 insertions, 0 deletions
diff --git a/arch/sh/kernel/ptrace_32.c b/arch/sh/kernel/ptrace_32.c
new file mode 100644
index 000000000000..ce0664a58b49
--- /dev/null
+++ b/arch/sh/kernel/ptrace_32.c
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1/*
2 * linux/arch/sh/kernel/ptrace.c
3 *
4 * Original x86 implementation:
5 * By Ross Biro 1/23/92
6 * edited by Linus Torvalds
7 *
8 * SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
9 * Audit support: Yuichi Nakamura <ynakam@hitachisoft.jp>
10 */
11#include <linux/kernel.h>
12#include <linux/sched.h>
13#include <linux/mm.h>
14#include <linux/smp.h>
15#include <linux/errno.h>
16#include <linux/ptrace.h>
17#include <linux/user.h>
18#include <linux/slab.h>
19#include <linux/security.h>
20#include <linux/signal.h>
21#include <linux/io.h>
22#include <linux/audit.h>
23#include <asm/uaccess.h>
24#include <asm/pgtable.h>
25#include <asm/system.h>
26#include <asm/processor.h>
27#include <asm/mmu_context.h>
28
29/*
30 * does not yet catch signals sent when the child dies.
31 * in exit.c or in signal.c.
32 */
33
34/*
35 * This routine will get a word off of the process kernel stack.
36 */
37static inline int get_stack_long(struct task_struct *task, int offset)
38{
39 unsigned char *stack;
40
41 stack = (unsigned char *)task_pt_regs(task);
42 stack += offset;
43 return (*((int *)stack));
44}
45
46/*
47 * This routine will put a word on the process kernel stack.
48 */
49static inline int put_stack_long(struct task_struct *task, int offset,
50 unsigned long data)
51{
52 unsigned char *stack;
53
54 stack = (unsigned char *)task_pt_regs(task);
55 stack += offset;
56 *(unsigned long *) stack = data;
57 return 0;
58}
59
60static void ptrace_disable_singlestep(struct task_struct *child)
61{
62 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
63
64 /*
65 * Ensure the UBC is not programmed at the next context switch.
66 *
67 * Normally this is not needed but there are sequences such as
68 * singlestep, signal delivery, and continue that leave the
69 * ubc_pc non-zero leading to spurious SIGTRAPs.
70 */
71 if (child->thread.ubc_pc != 0) {
72 ubc_usercnt -= 1;
73 child->thread.ubc_pc = 0;
74 }
75}
76
77/*
78 * Called by kernel/ptrace.c when detaching..
79 *
80 * Make sure single step bits etc are not set.
81 */
82void ptrace_disable(struct task_struct *child)
83{
84 ptrace_disable_singlestep(child);
85}
86
87long arch_ptrace(struct task_struct *child, long request, long addr, long data)
88{
89 struct user * dummy = NULL;
90 int ret;
91
92 switch (request) {
93 /* when I and D space are separate, these will need to be fixed. */
94 case PTRACE_PEEKTEXT: /* read word at location addr. */
95 case PTRACE_PEEKDATA:
96 ret = generic_ptrace_peekdata(child, addr, data);
97 break;
98
99 /* read the word at location addr in the USER area. */
100 case PTRACE_PEEKUSR: {
101 unsigned long tmp;
102
103 ret = -EIO;
104 if ((addr & 3) || addr < 0 ||
105 addr > sizeof(struct user) - 3)
106 break;
107
108 if (addr < sizeof(struct pt_regs))
109 tmp = get_stack_long(child, addr);
110 else if (addr >= (long) &dummy->fpu &&
111 addr < (long) &dummy->u_fpvalid) {
112 if (!tsk_used_math(child)) {
113 if (addr == (long)&dummy->fpu.fpscr)
114 tmp = FPSCR_INIT;
115 else
116 tmp = 0;
117 } else
118 tmp = ((long *)&child->thread.fpu)
119 [(addr - (long)&dummy->fpu) >> 2];
120 } else if (addr == (long) &dummy->u_fpvalid)
121 tmp = !!tsk_used_math(child);
122 else
123 tmp = 0;
124 ret = put_user(tmp, (unsigned long __user *)data);
125 break;
126 }
127
128 /* when I and D space are separate, this will have to be fixed. */
129 case PTRACE_POKETEXT: /* write the word at location addr. */
130 case PTRACE_POKEDATA:
131 ret = generic_ptrace_pokedata(child, addr, data);
132 break;
133
134 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
135 ret = -EIO;
136 if ((addr & 3) || addr < 0 ||
137 addr > sizeof(struct user) - 3)
138 break;
139
140 if (addr < sizeof(struct pt_regs))
141 ret = put_stack_long(child, addr, data);
142 else if (addr >= (long) &dummy->fpu &&
143 addr < (long) &dummy->u_fpvalid) {
144 set_stopped_child_used_math(child);
145 ((long *)&child->thread.fpu)
146 [(addr - (long)&dummy->fpu) >> 2] = data;
147 ret = 0;
148 } else if (addr == (long) &dummy->u_fpvalid) {
149 conditional_stopped_child_used_math(data, child);
150 ret = 0;
151 }
152 break;
153
154 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
155 case PTRACE_CONT: { /* restart after signal. */
156 ret = -EIO;
157 if (!valid_signal(data))
158 break;
159 if (request == PTRACE_SYSCALL)
160 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
161 else
162 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
163
164 ptrace_disable_singlestep(child);
165
166 child->exit_code = data;
167 wake_up_process(child);
168 ret = 0;
169 break;
170 }
171
172/*
173 * make the child exit. Best I can do is send it a sigkill.
174 * perhaps it should be put in the status that it wants to
175 * exit.
176 */
177 case PTRACE_KILL: {
178 ret = 0;
179 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
180 break;
181 ptrace_disable_singlestep(child);
182 child->exit_code = SIGKILL;
183 wake_up_process(child);
184 break;
185 }
186
187 case PTRACE_SINGLESTEP: { /* set the trap flag. */
188 long pc;
189 struct pt_regs *regs = NULL;
190
191 ret = -EIO;
192 if (!valid_signal(data))
193 break;
194 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
195 if ((child->ptrace & PT_DTRACE) == 0) {
196 /* Spurious delayed TF traps may occur */
197 child->ptrace |= PT_DTRACE;
198 }
199
200 pc = get_stack_long(child, (long)&regs->pc);
201
202 /* Next scheduling will set up UBC */
203 if (child->thread.ubc_pc == 0)
204 ubc_usercnt += 1;
205 child->thread.ubc_pc = pc;
206
207 set_tsk_thread_flag(child, TIF_SINGLESTEP);
208 child->exit_code = data;
209 /* give it a chance to run. */
210 wake_up_process(child);
211 ret = 0;
212 break;
213 }
214
215#ifdef CONFIG_SH_DSP
216 case PTRACE_GETDSPREGS: {
217 unsigned long dp;
218
219 ret = -EIO;
220 dp = ((unsigned long) child) + THREAD_SIZE -
221 sizeof(struct pt_dspregs);
222 if (*((int *) (dp - 4)) == SR_FD) {
223 copy_to_user(addr, (void *) dp,
224 sizeof(struct pt_dspregs));
225 ret = 0;
226 }
227 break;
228 }
229
230 case PTRACE_SETDSPREGS: {
231 unsigned long dp;
232
233 ret = -EIO;
234 dp = ((unsigned long) child) + THREAD_SIZE -
235 sizeof(struct pt_dspregs);
236 if (*((int *) (dp - 4)) == SR_FD) {
237 copy_from_user((void *) dp, addr,
238 sizeof(struct pt_dspregs));
239 ret = 0;
240 }
241 break;
242 }
243#endif
244 default:
245 ret = ptrace_request(child, request, addr, data);
246 break;
247 }
248
249 return ret;
250}
251
252asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
253{
254 struct task_struct *tsk = current;
255
256 if (unlikely(current->audit_context) && entryexit)
257 audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
258 regs->regs[0]);
259
260 if (!test_thread_flag(TIF_SYSCALL_TRACE) &&
261 !test_thread_flag(TIF_SINGLESTEP))
262 goto out;
263 if (!(tsk->ptrace & PT_PTRACED))
264 goto out;
265
266 /* the 0x80 provides a way for the tracing parent to distinguish
267 between a syscall stop and SIGTRAP delivery */
268 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) &&
269 !test_thread_flag(TIF_SINGLESTEP) ? 0x80 : 0));
270
271 /*
272 * this isn't the same as continuing with a signal, but it will do
273 * for normal use. strace only continues with a signal if the
274 * stopping signal is not SIGTRAP. -brl
275 */
276 if (tsk->exit_code) {
277 send_sig(tsk->exit_code, tsk, 1);
278 tsk->exit_code = 0;
279 }
280
281out:
282 if (unlikely(current->audit_context) && !entryexit)
283 audit_syscall_entry(AUDIT_ARCH_SH, regs->regs[3],
284 regs->regs[4], regs->regs[5],
285 regs->regs[6], regs->regs[7]);
286
287}