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
9 * see the extended register contents.
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/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>
25 #include <asm/errno.h>
26 #include <asm/debugreg.h>
28 #include <asm/fpu32.h>
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).
36 #define FLAG_MASK 0x54dd5UL
39 case offsetof(struct user32, regs.l): \
40 stack[offsetof(struct pt_regs, q) / 8] = val; break
42 static int putreg32(struct task_struct *child, unsigned regno, u32 val)
44 __u64 *stack = (__u64 *)task_pt_regs(child);
47 case offsetof(struct user32, regs.fs):
48 if (val && (val & 3) != 3)
50 child->thread.fsindex = val & 0xffff;
52 case offsetof(struct user32, regs.gs):
53 if (val && (val & 3) != 3)
55 child->thread.gsindex = val & 0xffff;
57 case offsetof(struct user32, regs.ds):
58 if (val && (val & 3) != 3)
60 child->thread.ds = val & 0xffff;
62 case offsetof(struct user32, regs.es):
63 child->thread.es = val & 0xffff;
65 case offsetof(struct user32, regs.ss):
68 stack[offsetof(struct pt_regs, ss)/8] = val & 0xffff;
70 case offsetof(struct user32, regs.cs):
73 stack[offsetof(struct pt_regs, cs)/8] = val & 0xffff;
83 R32(orig_eax, orig_rax);
87 case offsetof(struct user32, regs.eflags): {
88 __u64 *flags = &stack[offsetof(struct pt_regs, eflags)/8];
92 * If the user value contains TF, mark that
93 * it was not "us" (the debugger) that set it.
94 * If not, make sure it stays set if we had.
96 if (val & X86_EFLAGS_TF)
97 clear_tsk_thread_flag(child, TIF_FORCED_TF);
98 else if (test_tsk_thread_flag(child, TIF_FORCED_TF))
100 *flags = val | (*flags & ~FLAG_MASK);
104 case offsetof(struct user32, u_debugreg[0]) ...
105 offsetof(struct user32, u_debugreg[7]):
106 regno -= offsetof(struct user32, u_debugreg[0]);
107 return ptrace_set_debugreg(child, regno / 4, val);
110 if (regno > sizeof(struct user32) || (regno & 3))
114 * Other dummy fields in the virtual user structure
125 case offsetof(struct user32, regs.l): \
126 *val = stack[offsetof(struct pt_regs, q)/8]; break
128 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
130 __u64 *stack = (__u64 *)task_pt_regs(child);
133 case offsetof(struct user32, regs.fs):
134 *val = child->thread.fsindex;
136 case offsetof(struct user32, regs.gs):
137 *val = child->thread.gsindex;
139 case offsetof(struct user32, regs.ds):
140 *val = child->thread.ds;
142 case offsetof(struct user32, regs.es):
143 *val = child->thread.es;
155 R32(orig_eax, orig_rax);
159 case offsetof(struct user32, regs.eflags):
161 * If the debugger set TF, hide it from the readout.
163 *val = stack[offsetof(struct pt_regs, eflags)/8];
164 if (test_tsk_thread_flag(child, TIF_FORCED_TF))
165 *val &= ~X86_EFLAGS_TF;
168 case offsetof(struct user32, u_debugreg[0]) ...
169 offsetof(struct user32, u_debugreg[7]):
170 regno -= offsetof(struct user32, u_debugreg[0]);
171 *val = ptrace_get_debugreg(child, regno / 4);
175 if (regno > sizeof(struct user32) || (regno & 3))
179 * Other dummy fields in the virtual user structure
190 static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
192 siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t));
193 compat_siginfo_t __user *si32 = compat_ptr(data);
197 if (request == PTRACE_SETSIGINFO) {
198 memset(&ssi, 0, sizeof(siginfo_t));
199 ret = copy_siginfo_from_user32(&ssi, si32);
202 if (copy_to_user(si, &ssi, sizeof(siginfo_t)))
205 ret = sys_ptrace(request, pid, addr, (unsigned long)si);
208 if (request == PTRACE_GETSIGINFO) {
209 if (copy_from_user(&ssi, si, sizeof(siginfo_t)))
211 ret = copy_siginfo_to_user32(si32, &ssi);
216 asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
218 struct task_struct *child;
219 struct pt_regs *childregs;
220 void __user *datap = compat_ptr(data);
229 case PTRACE_SINGLESTEP:
230 case PTRACE_SINGLEBLOCK:
233 case PTRACE_OLDSETOPTIONS:
234 case PTRACE_SETOPTIONS:
235 case PTRACE_SET_THREAD_AREA:
236 case PTRACE_GET_THREAD_AREA:
237 return sys_ptrace(request, pid, addr, data);
242 case PTRACE_PEEKTEXT:
243 case PTRACE_PEEKDATA:
244 case PTRACE_POKEDATA:
245 case PTRACE_POKETEXT:
250 case PTRACE_SETFPREGS:
251 case PTRACE_GETFPREGS:
252 case PTRACE_SETFPXREGS:
253 case PTRACE_GETFPXREGS:
254 case PTRACE_GETEVENTMSG:
257 case PTRACE_SETSIGINFO:
258 case PTRACE_GETSIGINFO:
259 return ptrace32_siginfo(request, pid, addr, data);
262 child = ptrace_get_task_struct(pid);
264 return PTR_ERR(child);
266 ret = ptrace_check_attach(child, request == PTRACE_KILL);
270 childregs = task_pt_regs(child);
273 case PTRACE_PEEKDATA:
274 case PTRACE_PEEKTEXT:
276 if (access_process_vm(child, addr, &val, sizeof(u32), 0) !=
280 ret = put_user(val, (unsigned int __user *)datap);
283 case PTRACE_POKEDATA:
284 case PTRACE_POKETEXT:
286 if (access_process_vm(child, addr, &data, sizeof(u32), 1) !=
292 ret = getreg32(child, addr, &val);
294 ret = put_user(val, (__u32 __user *)datap);
298 ret = putreg32(child, addr, data);
301 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
304 if (!access_ok(VERIFY_WRITE, datap, 16*4)) {
309 for (i = 0; i <= 16*4; i += sizeof(__u32)) {
310 getreg32(child, i, &val);
311 ret |= __put_user(val, (u32 __user *)datap);
312 datap += sizeof(u32);
317 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
321 if (!access_ok(VERIFY_READ, datap, 16*4)) {
326 for (i = 0; i <= 16*4; i += sizeof(u32)) {
327 ret |= __get_user(tmp, (u32 __user *)datap);
328 putreg32(child, i, tmp);
329 datap += sizeof(u32);
334 case PTRACE_GETFPREGS:
336 if (!access_ok(VERIFY_READ, compat_ptr(data),
337 sizeof(struct user_i387_struct)))
339 save_i387_ia32(child, datap, childregs, 1);
343 case PTRACE_SETFPREGS:
345 if (!access_ok(VERIFY_WRITE, datap,
346 sizeof(struct user_i387_struct)))
349 /* don't check EFAULT to be bug-to-bug compatible to i386 */
350 restore_i387_ia32(child, datap, 1);
353 case PTRACE_GETFPXREGS: {
354 struct user32_fxsr_struct __user *u = datap;
358 if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
361 if (__copy_to_user(u, &child->thread.i387.fxsave, sizeof(*u)))
363 ret = __put_user(childregs->cs, &u->fcs);
364 ret |= __put_user(child->thread.ds, &u->fos);
367 case PTRACE_SETFPXREGS: {
368 struct user32_fxsr_struct __user *u = datap;
372 if (!access_ok(VERIFY_READ, u, sizeof(*u)))
375 * no checking to be bug-to-bug compatible with i386.
376 * but silence warning
378 if (__copy_from_user(&child->thread.i387.fxsave, u, sizeof(*u)))
380 set_stopped_child_used_math(child);
381 child->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
386 case PTRACE_GETEVENTMSG:
387 ret = put_user(child->ptrace_message,
388 (unsigned int __user *)compat_ptr(data));
396 put_task_struct(child);