2 * 32bit ptrace for x86-64.
4 * Copyright 2001,2002 Andi Kleen, SuSE Labs.
5 * Some parts copied from arch/i386/kernel/ptrace.c. See that file for earlier
8 * This allows to access 64bit processes too; but there is no way to see the extended
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>
18 #include <linux/ptrace.h>
19 #include <asm/ptrace.h>
20 #include <asm/compat.h>
21 #include <asm/uaccess.h>
22 #include <asm/user32.h>
24 #include <asm/errno.h>
25 #include <asm/debugreg.h>
27 #include <asm/fpu32.h>
31 * Determines which flags the user has access to [1 = access, 0 = no access].
32 * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), IOPL(12-13), IF(9).
33 * Also masks reserved bits (31-22, 15, 5, 3, 1).
35 #define FLAG_MASK 0x54dd5UL
38 case offsetof(struct user32, regs.l): stack[offsetof(struct pt_regs, q)/8] = val; break
40 static int putreg32(struct task_struct *child, unsigned regno, u32 val)
43 __u64 *stack = (__u64 *)task_pt_regs(child);
46 case offsetof(struct user32, regs.fs):
47 if (val && (val & 3) != 3) return -EIO;
48 child->thread.fsindex = val & 0xffff;
50 case offsetof(struct user32, regs.gs):
51 if (val && (val & 3) != 3) return -EIO;
52 child->thread.gsindex = val & 0xffff;
54 case offsetof(struct user32, regs.ds):
55 if (val && (val & 3) != 3) return -EIO;
56 child->thread.ds = val & 0xffff;
58 case offsetof(struct user32, regs.es):
59 child->thread.es = val & 0xffff;
61 case offsetof(struct user32, regs.ss):
62 if ((val & 3) != 3) return -EIO;
63 stack[offsetof(struct pt_regs, ss)/8] = val & 0xffff;
65 case offsetof(struct user32, regs.cs):
66 if ((val & 3) != 3) return -EIO;
67 stack[offsetof(struct pt_regs, cs)/8] = val & 0xffff;
77 R32(orig_eax, orig_rax);
81 case offsetof(struct user32, regs.eflags): {
82 __u64 *flags = &stack[offsetof(struct pt_regs, eflags)/8];
84 *flags = val | (*flags & ~FLAG_MASK);
88 case offsetof(struct user32, u_debugreg[4]):
89 case offsetof(struct user32, u_debugreg[5]):
92 case offsetof(struct user32, u_debugreg[0]):
93 child->thread.debugreg0 = val;
96 case offsetof(struct user32, u_debugreg[1]):
97 child->thread.debugreg1 = val;
100 case offsetof(struct user32, u_debugreg[2]):
101 child->thread.debugreg2 = val;
104 case offsetof(struct user32, u_debugreg[3]):
105 child->thread.debugreg3 = val;
108 case offsetof(struct user32, u_debugreg[6]):
109 child->thread.debugreg6 = val;
112 case offsetof(struct user32, u_debugreg[7]):
113 val &= ~DR_CONTROL_RESERVED;
114 /* See arch/i386/kernel/ptrace.c for an explanation of
115 * this awkward check.*/
117 if ((0x5454 >> ((val >> (16 + 4*i)) & 0xf)) & 1)
119 child->thread.debugreg7 = val;
123 if (regno > sizeof(struct user32) || (regno & 3))
126 /* Other dummy fields in the virtual user structure are ignored */
135 case offsetof(struct user32, regs.l): *val = stack[offsetof(struct pt_regs, q)/8]; break
137 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
139 __u64 *stack = (__u64 *)task_pt_regs(child);
142 case offsetof(struct user32, regs.fs):
143 *val = child->thread.fsindex;
145 case offsetof(struct user32, regs.gs):
146 *val = child->thread.gsindex;
148 case offsetof(struct user32, regs.ds):
149 *val = child->thread.ds;
151 case offsetof(struct user32, regs.es):
152 *val = child->thread.es;
164 R32(orig_eax, orig_rax);
169 case offsetof(struct user32, u_debugreg[0]):
170 *val = child->thread.debugreg0;
172 case offsetof(struct user32, u_debugreg[1]):
173 *val = child->thread.debugreg1;
175 case offsetof(struct user32, u_debugreg[2]):
176 *val = child->thread.debugreg2;
178 case offsetof(struct user32, u_debugreg[3]):
179 *val = child->thread.debugreg3;
181 case offsetof(struct user32, u_debugreg[6]):
182 *val = child->thread.debugreg6;
184 case offsetof(struct user32, u_debugreg[7]):
185 *val = child->thread.debugreg7;
189 if (regno > sizeof(struct user32) || (regno & 3))
192 /* Other dummy fields in the virtual user structure are ignored */
201 static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
204 compat_siginfo_t *si32 = (compat_siginfo_t *)compat_ptr(data);
206 siginfo_t *si = compat_alloc_user_space(sizeof(siginfo_t));
207 if (request == PTRACE_SETSIGINFO) {
208 memset(&ssi, 0, sizeof(siginfo_t));
209 ret = copy_siginfo_from_user32(&ssi, si32);
212 if (copy_to_user(si, &ssi, sizeof(siginfo_t)))
215 ret = sys_ptrace(request, pid, addr, (unsigned long)si);
218 if (request == PTRACE_GETSIGINFO) {
219 if (copy_from_user(&ssi, si, sizeof(siginfo_t)))
221 ret = copy_siginfo_to_user32(si32, &ssi);
226 asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
228 struct task_struct *child;
229 struct pt_regs *childregs;
230 void __user *datap = compat_ptr(data);
239 case PTRACE_SINGLESTEP:
242 case PTRACE_SETOPTIONS:
243 return sys_ptrace(request, pid, addr, data);
248 case PTRACE_PEEKTEXT:
249 case PTRACE_PEEKDATA:
250 case PTRACE_POKEDATA:
251 case PTRACE_POKETEXT:
256 case PTRACE_SETFPREGS:
257 case PTRACE_GETFPREGS:
258 case PTRACE_SETFPXREGS:
259 case PTRACE_GETFPXREGS:
260 case PTRACE_GETEVENTMSG:
263 case PTRACE_SETSIGINFO:
264 case PTRACE_GETSIGINFO:
265 return ptrace32_siginfo(request, pid, addr, data);
268 child = ptrace_get_task_struct(pid);
270 return PTR_ERR(child);
272 ret = ptrace_check_attach(child, request == PTRACE_KILL);
276 childregs = task_pt_regs(child);
279 case PTRACE_PEEKDATA:
280 case PTRACE_PEEKTEXT:
282 if (access_process_vm(child, addr, &val, sizeof(u32), 0)!=sizeof(u32))
285 ret = put_user(val, (unsigned int __user *)datap);
288 case PTRACE_POKEDATA:
289 case PTRACE_POKETEXT:
291 if (access_process_vm(child, addr, &data, sizeof(u32), 1)!=sizeof(u32))
296 ret = getreg32(child, addr, &val);
298 ret = put_user(val, (__u32 __user *)datap);
302 ret = putreg32(child, addr, data);
305 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
307 if (!access_ok(VERIFY_WRITE, datap, 16*4)) {
312 for ( i = 0; i <= 16*4 ; i += sizeof(__u32) ) {
313 getreg32(child, i, &val);
314 ret |= __put_user(val,(u32 __user *)datap);
315 datap += sizeof(u32);
320 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
323 if (!access_ok(VERIFY_READ, datap, 16*4)) {
328 for ( i = 0; i <= 16*4; i += sizeof(u32) ) {
329 ret |= __get_user(tmp, (u32 __user *)datap);
330 putreg32(child, i, tmp);
331 datap += sizeof(u32);
336 case PTRACE_GETFPREGS:
338 if (!access_ok(VERIFY_READ, compat_ptr(data),
339 sizeof(struct user_i387_struct)))
341 save_i387_ia32(child, datap, childregs, 1);
345 case PTRACE_SETFPREGS:
347 if (!access_ok(VERIFY_WRITE, datap,
348 sizeof(struct user_i387_struct)))
351 /* don't check EFAULT to be bug-to-bug compatible to i386 */
352 restore_i387_ia32(child, datap, 1);
355 case PTRACE_GETFPXREGS: {
356 struct user32_fxsr_struct __user *u = datap;
359 if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
362 if (__copy_to_user(u, &child->thread.i387.fxsave, sizeof(*u)))
364 ret = __put_user(childregs->cs, &u->fcs);
365 ret |= __put_user(child->thread.ds, &u->fos);
368 case PTRACE_SETFPXREGS: {
369 struct user32_fxsr_struct __user *u = datap;
372 if (!access_ok(VERIFY_READ, u, sizeof(*u)))
374 /* no checking to be bug-to-bug compatible with i386 */
375 __copy_from_user(&child->thread.i387.fxsave, u, sizeof(*u));
376 set_stopped_child_used_math(child);
377 child->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
382 case PTRACE_GETEVENTMSG:
383 ret = put_user(child->ptrace_message,(unsigned int __user *)compat_ptr(data));
391 put_task_struct(child);