diff options
Diffstat (limited to 'arch/sh/kernel/ptrace_32.c')
-rw-r--r-- | arch/sh/kernel/ptrace_32.c | 287 |
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 | |||
@@ -0,0 +1,287 @@ | |||
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 | */ | ||
37 | static 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 | */ | ||
49 | static 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 | |||
60 | static 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 | */ | ||
82 | void ptrace_disable(struct task_struct *child) | ||
83 | { | ||
84 | ptrace_disable_singlestep(child); | ||
85 | } | ||
86 | |||
87 | long 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)®s->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 | |||
252 | asmlinkage 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 | |||
281 | out: | ||
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 | } | ||