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
11 * $Id: ptrace32.c,v 1.16 2003/03/14 16:06:35 ak Exp $
14 #include <linux/kernel.h>
15 #include <linux/stddef.h>
16 #include <linux/sched.h>
17 #include <linux/syscalls.h>
18 #include <linux/unistd.h>
20 #include <linux/ptrace.h>
21 #include <asm/ptrace.h>
22 #include <asm/uaccess.h>
23 #include <asm/user32.h>
25 #include <asm/errno.h>
26 #include <asm/debugreg.h>
28 #include <asm/fpu32.h>
30 /* determines which flags the user has access to. */
31 /* 1 = access 0 = no access */
32 #define FLAG_MASK 0x44dd5UL
35 case offsetof(struct user32, regs.l): stack[offsetof(struct pt_regs, q)/8] = val; break
37 static int putreg32(struct task_struct *child, unsigned regno, u32 val)
40 __u64 *stack = (__u64 *)(child->thread.rsp0 - sizeof(struct pt_regs));
43 case offsetof(struct user32, regs.fs):
44 if (val && (val & 3) != 3) return -EIO;
45 child->thread.fs = val & 0xffff;
47 case offsetof(struct user32, regs.gs):
48 if (val && (val & 3) != 3) return -EIO;
49 child->thread.gs = val & 0xffff;
51 case offsetof(struct user32, regs.ds):
52 if (val && (val & 3) != 3) return -EIO;
53 child->thread.ds = val & 0xffff;
55 case offsetof(struct user32, regs.es):
56 child->thread.es = val & 0xffff;
58 case offsetof(struct user32, regs.ss):
59 if ((val & 3) != 3) return -EIO;
60 stack[offsetof(struct pt_regs, ss)/8] = val & 0xffff;
62 case offsetof(struct user32, regs.cs):
63 if ((val & 3) != 3) return -EIO;
64 stack[offsetof(struct pt_regs, cs)/8] = val & 0xffff;
74 R32(orig_eax, orig_rax);
78 case offsetof(struct user32, regs.eflags): {
79 __u64 *flags = &stack[offsetof(struct pt_regs, eflags)/8];
81 *flags = val | (*flags & ~FLAG_MASK);
85 case offsetof(struct user32, u_debugreg[4]):
86 case offsetof(struct user32, u_debugreg[5]):
89 case offsetof(struct user32, u_debugreg[0]):
90 child->thread.debugreg0 = val;
93 case offsetof(struct user32, u_debugreg[1]):
94 child->thread.debugreg1 = val;
97 case offsetof(struct user32, u_debugreg[2]):
98 child->thread.debugreg2 = val;
101 case offsetof(struct user32, u_debugreg[3]):
102 child->thread.debugreg3 = val;
105 case offsetof(struct user32, u_debugreg[6]):
106 child->thread.debugreg6 = val;
109 case offsetof(struct user32, u_debugreg[7]):
110 val &= ~DR_CONTROL_RESERVED;
111 /* You are not expected to understand this ... I don't neither. */
113 if ((0x5454 >> ((val >> (16 + 4*i)) & 0xf)) & 1)
115 child->thread.debugreg7 = val;
119 if (regno > sizeof(struct user32) || (regno & 3))
122 /* Other dummy fields in the virtual user structure are ignored */
131 case offsetof(struct user32, regs.l): *val = stack[offsetof(struct pt_regs, q)/8]; break
133 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
135 __u64 *stack = (__u64 *)(child->thread.rsp0 - sizeof(struct pt_regs));
138 case offsetof(struct user32, regs.fs):
139 *val = child->thread.fs;
141 case offsetof(struct user32, regs.gs):
142 *val = child->thread.gs;
144 case offsetof(struct user32, regs.ds):
145 *val = child->thread.ds;
147 case offsetof(struct user32, regs.es):
148 *val = child->thread.es;
160 R32(orig_eax, orig_rax);
165 case offsetof(struct user32, u_debugreg[0]):
166 *val = child->thread.debugreg0;
168 case offsetof(struct user32, u_debugreg[1]):
169 *val = child->thread.debugreg1;
171 case offsetof(struct user32, u_debugreg[2]):
172 *val = child->thread.debugreg2;
174 case offsetof(struct user32, u_debugreg[3]):
175 *val = child->thread.debugreg3;
177 case offsetof(struct user32, u_debugreg[6]):
178 *val = child->thread.debugreg6;
180 case offsetof(struct user32, u_debugreg[7]):
181 *val = child->thread.debugreg7;
185 if (regno > sizeof(struct user32) || (regno & 3))
188 /* Other dummy fields in the virtual user structure are ignored */
197 static struct task_struct *find_target(int request, int pid, int *err)
199 struct task_struct *child;
206 read_lock(&tasklist_lock);
207 child = find_task_by_pid(pid);
209 get_task_struct(child);
210 read_unlock(&tasklist_lock);
215 *err = ptrace_check_attach(child, request == PTRACE_KILL);
222 put_task_struct(child);
227 asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
229 struct task_struct *child;
230 struct pt_regs *childregs;
236 return sys_ptrace(request, pid, addr, data);
238 case PTRACE_PEEKTEXT:
239 case PTRACE_PEEKDATA:
240 case PTRACE_POKEDATA:
241 case PTRACE_POKETEXT:
246 case PTRACE_SETFPREGS:
247 case PTRACE_GETFPREGS:
248 case PTRACE_SETFPXREGS:
249 case PTRACE_GETFPXREGS:
254 child = find_target(request, pid, &ret);
258 childregs = (struct pt_regs *)(child->thread.rsp0 - sizeof(struct pt_regs));
261 case PTRACE_PEEKDATA:
262 case PTRACE_PEEKTEXT:
264 if (access_process_vm(child, addr, &val, sizeof(u32), 0)!=sizeof(u32))
267 ret = put_user(val, (unsigned int *)(u64)data);
270 case PTRACE_POKEDATA:
271 case PTRACE_POKETEXT:
273 if (access_process_vm(child, addr, &data, sizeof(u32), 1)!=sizeof(u32))
278 ret = getreg32(child, addr, &val);
280 ret = put_user(val, (__u32 *)(unsigned long) data);
284 ret = putreg32(child, addr, data);
287 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
289 if (!access_ok(VERIFY_WRITE, (unsigned *)(unsigned long)data, 16*4)) {
294 for ( i = 0; i <= 16*4 ; i += sizeof(__u32) ) {
295 getreg32(child, i, &val);
296 ret |= __put_user(val,(u32 *) (unsigned long) data);
302 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
305 if (!access_ok(VERIFY_READ, (unsigned *)(unsigned long)data, 16*4)) {
310 for ( i = 0; i <= 16*4; i += sizeof(u32) ) {
311 ret |= __get_user(tmp, (u32 *) (unsigned long) data);
312 putreg32(child, i, tmp);
318 case PTRACE_GETFPREGS:
320 if (!access_ok(VERIFY_READ, (void *)(u64)data,
321 sizeof(struct user_i387_struct)))
323 save_i387_ia32(child, (void *)(u64)data, childregs, 1);
327 case PTRACE_SETFPREGS:
329 if (!access_ok(VERIFY_WRITE, (void *)(u64)data,
330 sizeof(struct user_i387_struct)))
333 /* don't check EFAULT to be bug-to-bug compatible to i386 */
334 restore_i387_ia32(child, (void *)(u64)data, 1);
337 case PTRACE_GETFPXREGS: {
338 struct user32_fxsr_struct *u = (void *)(u64)data;
341 if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
344 if (__copy_to_user(u, &child->thread.i387.fxsave, sizeof(*u)))
346 ret = __put_user(childregs->cs, &u->fcs);
347 ret |= __put_user(child->thread.ds, &u->fos);
350 case PTRACE_SETFPXREGS: {
351 struct user32_fxsr_struct *u = (void *)(u64)data;
354 if (!access_ok(VERIFY_READ, u, sizeof(*u)))
356 /* no checking to be bug-to-bug compatible with i386 */
357 __copy_from_user(&child->thread.i387.fxsave, u, sizeof(*u));
358 child->used_math = 1;
359 child->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
369 put_task_struct(child);