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-rw-r--r--arch/sh/kernel/ptrace_32.c274
1 files changed, 274 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..ac725f0aeb72
--- /dev/null
+++ b/arch/sh/kernel/ptrace_32.c
@@ -0,0 +1,274 @@
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 *
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 <asm/uaccess.h>
23#include <asm/pgtable.h>
24#include <asm/system.h>
25#include <asm/processor.h>
26#include <asm/mmu_context.h>
27
28/*
29 * does not yet catch signals sent when the child dies.
30 * in exit.c or in signal.c.
31 */
32
33/*
34 * This routine will get a word off of the process kernel stack.
35 */
36static inline int get_stack_long(struct task_struct *task, int offset)
37{
38 unsigned char *stack;
39
40 stack = (unsigned char *)task_pt_regs(task);
41 stack += offset;
42 return (*((int *)stack));
43}
44
45/*
46 * This routine will put a word on the process kernel stack.
47 */
48static inline int put_stack_long(struct task_struct *task, int offset,
49 unsigned long data)
50{
51 unsigned char *stack;
52
53 stack = (unsigned char *)task_pt_regs(task);
54 stack += offset;
55 *(unsigned long *) stack = data;
56 return 0;
57}
58
59static void ptrace_disable_singlestep(struct task_struct *child)
60{
61 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
62
63 /*
64 * Ensure the UBC is not programmed at the next context switch.
65 *
66 * Normally this is not needed but there are sequences such as
67 * singlestep, signal delivery, and continue that leave the
68 * ubc_pc non-zero leading to spurious SIGTRAPs.
69 */
70 if (child->thread.ubc_pc != 0) {
71 ubc_usercnt -= 1;
72 child->thread.ubc_pc = 0;
73 }
74}
75
76/*
77 * Called by kernel/ptrace.c when detaching..
78 *
79 * Make sure single step bits etc are not set.
80 */
81void ptrace_disable(struct task_struct *child)
82{
83 ptrace_disable_singlestep(child);
84}
85
86long arch_ptrace(struct task_struct *child, long request, long addr, long data)
87{
88 struct user * dummy = NULL;
89 int ret;
90
91 switch (request) {
92 /* when I and D space are separate, these will need to be fixed. */
93 case PTRACE_PEEKTEXT: /* read word at location addr. */
94 case PTRACE_PEEKDATA:
95 ret = generic_ptrace_peekdata(child, addr, data);
96 break;
97
98 /* read the word at location addr in the USER area. */
99 case PTRACE_PEEKUSR: {
100 unsigned long tmp;
101
102 ret = -EIO;
103 if ((addr & 3) || addr < 0 ||
104 addr > sizeof(struct user) - 3)
105 break;
106
107 if (addr < sizeof(struct pt_regs))
108 tmp = get_stack_long(child, addr);
109 else if (addr >= (long) &dummy->fpu &&
110 addr < (long) &dummy->u_fpvalid) {
111 if (!tsk_used_math(child)) {
112 if (addr == (long)&dummy->fpu.fpscr)
113 tmp = FPSCR_INIT;
114 else
115 tmp = 0;
116 } else
117 tmp = ((long *)&child->thread.fpu)
118 [(addr - (long)&dummy->fpu) >> 2];
119 } else if (addr == (long) &dummy->u_fpvalid)
120 tmp = !!tsk_used_math(child);
121 else
122 tmp = 0;
123 ret = put_user(tmp, (unsigned long __user *)data);
124 break;
125 }
126
127 /* when I and D space are separate, this will have to be fixed. */
128 case PTRACE_POKETEXT: /* write the word at location addr. */
129 case PTRACE_POKEDATA:
130 ret = generic_ptrace_pokedata(child, addr, data);
131 break;
132
133 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
134 ret = -EIO;
135 if ((addr & 3) || addr < 0 ||
136 addr > sizeof(struct user) - 3)
137 break;
138
139 if (addr < sizeof(struct pt_regs))
140 ret = put_stack_long(child, addr, data);
141 else if (addr >= (long) &dummy->fpu &&
142 addr < (long) &dummy->u_fpvalid) {
143 set_stopped_child_used_math(child);
144 ((long *)&child->thread.fpu)
145 [(addr - (long)&dummy->fpu) >> 2] = data;
146 ret = 0;
147 } else if (addr == (long) &dummy->u_fpvalid) {
148 conditional_stopped_child_used_math(data, child);
149 ret = 0;
150 }
151 break;
152
153 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
154 case PTRACE_CONT: { /* restart after signal. */
155 ret = -EIO;
156 if (!valid_signal(data))
157 break;
158 if (request == PTRACE_SYSCALL)
159 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
160 else
161 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
162
163 ptrace_disable_singlestep(child);
164
165 child->exit_code = data;
166 wake_up_process(child);
167 ret = 0;
168 break;
169 }
170
171/*
172 * make the child exit. Best I can do is send it a sigkill.
173 * perhaps it should be put in the status that it wants to
174 * exit.
175 */
176 case PTRACE_KILL: {
177 ret = 0;
178 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
179 break;
180 ptrace_disable_singlestep(child);
181 child->exit_code = SIGKILL;
182 wake_up_process(child);
183 break;
184 }
185
186 case PTRACE_SINGLESTEP: { /* set the trap flag. */
187 long pc;
188 struct pt_regs *regs = NULL;
189
190 ret = -EIO;
191 if (!valid_signal(data))
192 break;
193 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
194 if ((child->ptrace & PT_DTRACE) == 0) {
195 /* Spurious delayed TF traps may occur */
196 child->ptrace |= PT_DTRACE;
197 }
198
199 pc = get_stack_long(child, (long)&regs->pc);
200
201 /* Next scheduling will set up UBC */
202 if (child->thread.ubc_pc == 0)
203 ubc_usercnt += 1;
204 child->thread.ubc_pc = pc;
205
206 set_tsk_thread_flag(child, TIF_SINGLESTEP);
207 child->exit_code = data;
208 /* give it a chance to run. */
209 wake_up_process(child);
210 ret = 0;
211 break;
212 }
213
214#ifdef CONFIG_SH_DSP
215 case PTRACE_GETDSPREGS: {
216 unsigned long dp;
217
218 ret = -EIO;
219 dp = ((unsigned long) child) + THREAD_SIZE -
220 sizeof(struct pt_dspregs);
221 if (*((int *) (dp - 4)) == SR_FD) {
222 copy_to_user(addr, (void *) dp,
223 sizeof(struct pt_dspregs));
224 ret = 0;
225 }
226 break;
227 }
228
229 case PTRACE_SETDSPREGS: {
230 unsigned long dp;
231
232 ret = -EIO;
233 dp = ((unsigned long) child) + THREAD_SIZE -
234 sizeof(struct pt_dspregs);
235 if (*((int *) (dp - 4)) == SR_FD) {
236 copy_from_user((void *) dp, addr,
237 sizeof(struct pt_dspregs));
238 ret = 0;
239 }
240 break;
241 }
242#endif
243 default:
244 ret = ptrace_request(child, request, addr, data);
245 break;
246 }
247
248 return ret;
249}
250
251asmlinkage void do_syscall_trace(void)
252{
253 struct task_struct *tsk = current;
254
255 if (!test_thread_flag(TIF_SYSCALL_TRACE) &&
256 !test_thread_flag(TIF_SINGLESTEP))
257 return;
258 if (!(tsk->ptrace & PT_PTRACED))
259 return;
260 /* the 0x80 provides a way for the tracing parent to distinguish
261 between a syscall stop and SIGTRAP delivery */
262 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) &&
263 !test_thread_flag(TIF_SINGLESTEP) ? 0x80 : 0));
264
265 /*
266 * this isn't the same as continuing with a signal, but it will do
267 * for normal use. strace only continues with a signal if the
268 * stopping signal is not SIGTRAP. -brl
269 */
270 if (tsk->exit_code) {
271 send_sig(tsk->exit_code, tsk, 1);
272 tsk->exit_code = 0;
273 }
274}
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