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-rw-r--r--arch/x86/ia32/ptrace32.c404
1 files changed, 404 insertions, 0 deletions
diff --git a/arch/x86/ia32/ptrace32.c b/arch/x86/ia32/ptrace32.c
new file mode 100644
index 000000000000..4a233ad6269c
--- /dev/null
+++ b/arch/x86/ia32/ptrace32.c
@@ -0,0 +1,404 @@
1/*
2 * 32bit ptrace for x86-64.
3 *
4 * Copyright 2001,2002 Andi Kleen, SuSE Labs.
5 * Some parts copied from arch/i386/kernel/ptrace.c. See that file for earlier
6 * copyright.
7 *
8 * This allows to access 64bit processes too; but there is no way to see the extended
9 * register contents.
10 */
11
12#include <linux/kernel.h>
13#include <linux/stddef.h>
14#include <linux/sched.h>
15#include <linux/syscalls.h>
16#include <linux/unistd.h>
17#include <linux/mm.h>
18#include <linux/err.h>
19#include <linux/ptrace.h>
20#include <asm/ptrace.h>
21#include <asm/compat.h>
22#include <asm/uaccess.h>
23#include <asm/user32.h>
24#include <asm/user.h>
25#include <asm/errno.h>
26#include <asm/debugreg.h>
27#include <asm/i387.h>
28#include <asm/fpu32.h>
29#include <asm/ia32.h>
30
31/*
32 * Determines which flags the user has access to [1 = access, 0 = no access].
33 * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), IOPL(12-13), IF(9).
34 * Also masks reserved bits (31-22, 15, 5, 3, 1).
35 */
36#define FLAG_MASK 0x54dd5UL
37
38#define R32(l,q) \
39 case offsetof(struct user32, regs.l): stack[offsetof(struct pt_regs, q)/8] = val; break
40
41static int putreg32(struct task_struct *child, unsigned regno, u32 val)
42{
43 int i;
44 __u64 *stack = (__u64 *)task_pt_regs(child);
45
46 switch (regno) {
47 case offsetof(struct user32, regs.fs):
48 if (val && (val & 3) != 3) return -EIO;
49 child->thread.fsindex = val & 0xffff;
50 break;
51 case offsetof(struct user32, regs.gs):
52 if (val && (val & 3) != 3) return -EIO;
53 child->thread.gsindex = val & 0xffff;
54 break;
55 case offsetof(struct user32, regs.ds):
56 if (val && (val & 3) != 3) return -EIO;
57 child->thread.ds = val & 0xffff;
58 break;
59 case offsetof(struct user32, regs.es):
60 child->thread.es = val & 0xffff;
61 break;
62 case offsetof(struct user32, regs.ss):
63 if ((val & 3) != 3) return -EIO;
64 stack[offsetof(struct pt_regs, ss)/8] = val & 0xffff;
65 break;
66 case offsetof(struct user32, regs.cs):
67 if ((val & 3) != 3) return -EIO;
68 stack[offsetof(struct pt_regs, cs)/8] = val & 0xffff;
69 break;
70
71 R32(ebx, rbx);
72 R32(ecx, rcx);
73 R32(edx, rdx);
74 R32(edi, rdi);
75 R32(esi, rsi);
76 R32(ebp, rbp);
77 R32(eax, rax);
78 R32(orig_eax, orig_rax);
79 R32(eip, rip);
80 R32(esp, rsp);
81
82 case offsetof(struct user32, regs.eflags): {
83 __u64 *flags = &stack[offsetof(struct pt_regs, eflags)/8];
84 val &= FLAG_MASK;
85 *flags = val | (*flags & ~FLAG_MASK);
86 break;
87 }
88
89 case offsetof(struct user32, u_debugreg[4]):
90 case offsetof(struct user32, u_debugreg[5]):
91 return -EIO;
92
93 case offsetof(struct user32, u_debugreg[0]):
94 child->thread.debugreg0 = val;
95 break;
96
97 case offsetof(struct user32, u_debugreg[1]):
98 child->thread.debugreg1 = val;
99 break;
100
101 case offsetof(struct user32, u_debugreg[2]):
102 child->thread.debugreg2 = val;
103 break;
104
105 case offsetof(struct user32, u_debugreg[3]):
106 child->thread.debugreg3 = val;
107 break;
108
109 case offsetof(struct user32, u_debugreg[6]):
110 child->thread.debugreg6 = val;
111 break;
112
113 case offsetof(struct user32, u_debugreg[7]):
114 val &= ~DR_CONTROL_RESERVED;
115 /* See arch/i386/kernel/ptrace.c for an explanation of
116 * this awkward check.*/
117 for(i=0; i<4; i++)
118 if ((0x5454 >> ((val >> (16 + 4*i)) & 0xf)) & 1)
119 return -EIO;
120 child->thread.debugreg7 = val;
121 if (val)
122 set_tsk_thread_flag(child, TIF_DEBUG);
123 else
124 clear_tsk_thread_flag(child, TIF_DEBUG);
125 break;
126
127 default:
128 if (regno > sizeof(struct user32) || (regno & 3))
129 return -EIO;
130
131 /* Other dummy fields in the virtual user structure are ignored */
132 break;
133 }
134 return 0;
135}
136
137#undef R32
138
139#define R32(l,q) \
140 case offsetof(struct user32, regs.l): *val = stack[offsetof(struct pt_regs, q)/8]; break
141
142static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
143{
144 __u64 *stack = (__u64 *)task_pt_regs(child);
145
146 switch (regno) {
147 case offsetof(struct user32, regs.fs):
148 *val = child->thread.fsindex;
149 break;
150 case offsetof(struct user32, regs.gs):
151 *val = child->thread.gsindex;
152 break;
153 case offsetof(struct user32, regs.ds):
154 *val = child->thread.ds;
155 break;
156 case offsetof(struct user32, regs.es):
157 *val = child->thread.es;
158 break;
159
160 R32(cs, cs);
161 R32(ss, ss);
162 R32(ebx, rbx);
163 R32(ecx, rcx);
164 R32(edx, rdx);
165 R32(edi, rdi);
166 R32(esi, rsi);
167 R32(ebp, rbp);
168 R32(eax, rax);
169 R32(orig_eax, orig_rax);
170 R32(eip, rip);
171 R32(eflags, eflags);
172 R32(esp, rsp);
173
174 case offsetof(struct user32, u_debugreg[0]):
175 *val = child->thread.debugreg0;
176 break;
177 case offsetof(struct user32, u_debugreg[1]):
178 *val = child->thread.debugreg1;
179 break;
180 case offsetof(struct user32, u_debugreg[2]):
181 *val = child->thread.debugreg2;
182 break;
183 case offsetof(struct user32, u_debugreg[3]):
184 *val = child->thread.debugreg3;
185 break;
186 case offsetof(struct user32, u_debugreg[6]):
187 *val = child->thread.debugreg6;
188 break;
189 case offsetof(struct user32, u_debugreg[7]):
190 *val = child->thread.debugreg7;
191 break;
192
193 default:
194 if (regno > sizeof(struct user32) || (regno & 3))
195 return -EIO;
196
197 /* Other dummy fields in the virtual user structure are ignored */
198 *val = 0;
199 break;
200 }
201 return 0;
202}
203
204#undef R32
205
206static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
207{
208 int ret;
209 compat_siginfo_t __user *si32 = compat_ptr(data);
210 siginfo_t ssi;
211 siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t));
212 if (request == PTRACE_SETSIGINFO) {
213 memset(&ssi, 0, sizeof(siginfo_t));
214 ret = copy_siginfo_from_user32(&ssi, si32);
215 if (ret)
216 return ret;
217 if (copy_to_user(si, &ssi, sizeof(siginfo_t)))
218 return -EFAULT;
219 }
220 ret = sys_ptrace(request, pid, addr, (unsigned long)si);
221 if (ret)
222 return ret;
223 if (request == PTRACE_GETSIGINFO) {
224 if (copy_from_user(&ssi, si, sizeof(siginfo_t)))
225 return -EFAULT;
226 ret = copy_siginfo_to_user32(si32, &ssi);
227 }
228 return ret;
229}
230
231asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
232{
233 struct task_struct *child;
234 struct pt_regs *childregs;
235 void __user *datap = compat_ptr(data);
236 int ret;
237 __u32 val;
238
239 switch (request) {
240 case PTRACE_TRACEME:
241 case PTRACE_ATTACH:
242 case PTRACE_KILL:
243 case PTRACE_CONT:
244 case PTRACE_SINGLESTEP:
245 case PTRACE_DETACH:
246 case PTRACE_SYSCALL:
247 case PTRACE_OLDSETOPTIONS:
248 case PTRACE_SETOPTIONS:
249 case PTRACE_SET_THREAD_AREA:
250 case PTRACE_GET_THREAD_AREA:
251 return sys_ptrace(request, pid, addr, data);
252
253 default:
254 return -EINVAL;
255
256 case PTRACE_PEEKTEXT:
257 case PTRACE_PEEKDATA:
258 case PTRACE_POKEDATA:
259 case PTRACE_POKETEXT:
260 case PTRACE_POKEUSR:
261 case PTRACE_PEEKUSR:
262 case PTRACE_GETREGS:
263 case PTRACE_SETREGS:
264 case PTRACE_SETFPREGS:
265 case PTRACE_GETFPREGS:
266 case PTRACE_SETFPXREGS:
267 case PTRACE_GETFPXREGS:
268 case PTRACE_GETEVENTMSG:
269 break;
270
271 case PTRACE_SETSIGINFO:
272 case PTRACE_GETSIGINFO:
273 return ptrace32_siginfo(request, pid, addr, data);
274 }
275
276 child = ptrace_get_task_struct(pid);
277 if (IS_ERR(child))
278 return PTR_ERR(child);
279
280 ret = ptrace_check_attach(child, request == PTRACE_KILL);
281 if (ret < 0)
282 goto out;
283
284 childregs = task_pt_regs(child);
285
286 switch (request) {
287 case PTRACE_PEEKDATA:
288 case PTRACE_PEEKTEXT:
289 ret = 0;
290 if (access_process_vm(child, addr, &val, sizeof(u32), 0)!=sizeof(u32))
291 ret = -EIO;
292 else
293 ret = put_user(val, (unsigned int __user *)datap);
294 break;
295
296 case PTRACE_POKEDATA:
297 case PTRACE_POKETEXT:
298 ret = 0;
299 if (access_process_vm(child, addr, &data, sizeof(u32), 1)!=sizeof(u32))
300 ret = -EIO;
301 break;
302
303 case PTRACE_PEEKUSR:
304 ret = getreg32(child, addr, &val);
305 if (ret == 0)
306 ret = put_user(val, (__u32 __user *)datap);
307 break;
308
309 case PTRACE_POKEUSR:
310 ret = putreg32(child, addr, data);
311 break;
312
313 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
314 int i;
315 if (!access_ok(VERIFY_WRITE, datap, 16*4)) {
316 ret = -EIO;
317 break;
318 }
319 ret = 0;
320 for ( i = 0; i <= 16*4 ; i += sizeof(__u32) ) {
321 getreg32(child, i, &val);
322 ret |= __put_user(val,(u32 __user *)datap);
323 datap += sizeof(u32);
324 }
325 break;
326 }
327
328 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
329 unsigned long tmp;
330 int i;
331 if (!access_ok(VERIFY_READ, datap, 16*4)) {
332 ret = -EIO;
333 break;
334 }
335 ret = 0;
336 for ( i = 0; i <= 16*4; i += sizeof(u32) ) {
337 ret |= __get_user(tmp, (u32 __user *)datap);
338 putreg32(child, i, tmp);
339 datap += sizeof(u32);
340 }
341 break;
342 }
343
344 case PTRACE_GETFPREGS:
345 ret = -EIO;
346 if (!access_ok(VERIFY_READ, compat_ptr(data),
347 sizeof(struct user_i387_struct)))
348 break;
349 save_i387_ia32(child, datap, childregs, 1);
350 ret = 0;
351 break;
352
353 case PTRACE_SETFPREGS:
354 ret = -EIO;
355 if (!access_ok(VERIFY_WRITE, datap,
356 sizeof(struct user_i387_struct)))
357 break;
358 ret = 0;
359 /* don't check EFAULT to be bug-to-bug compatible to i386 */
360 restore_i387_ia32(child, datap, 1);
361 break;
362
363 case PTRACE_GETFPXREGS: {
364 struct user32_fxsr_struct __user *u = datap;
365 init_fpu(child);
366 ret = -EIO;
367 if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
368 break;
369 ret = -EFAULT;
370 if (__copy_to_user(u, &child->thread.i387.fxsave, sizeof(*u)))
371 break;
372 ret = __put_user(childregs->cs, &u->fcs);
373 ret |= __put_user(child->thread.ds, &u->fos);
374 break;
375 }
376 case PTRACE_SETFPXREGS: {
377 struct user32_fxsr_struct __user *u = datap;
378 unlazy_fpu(child);
379 ret = -EIO;
380 if (!access_ok(VERIFY_READ, u, sizeof(*u)))
381 break;
382 /* no checking to be bug-to-bug compatible with i386. */
383 /* but silence warning */
384 if (__copy_from_user(&child->thread.i387.fxsave, u, sizeof(*u)))
385 ;
386 set_stopped_child_used_math(child);
387 child->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
388 ret = 0;
389 break;
390 }
391
392 case PTRACE_GETEVENTMSG:
393 ret = put_user(child->ptrace_message,(unsigned int __user *)compat_ptr(data));
394 break;
395
396 default:
397 BUG();
398 }
399
400 out:
401 put_task_struct(child);
402 return ret;
403}
404
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