2 /* By Ross Biro 1/23/92 */
4 * Pentium III FXSR, SSE support
5 * Gareth Hughes <gareth@valinux.com>, May 2000
7 * x86-64 port 2000-2002 Andi Kleen
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
13 #include <linux/smp.h>
14 #include <linux/smp_lock.h>
15 #include <linux/errno.h>
16 #include <linux/ptrace.h>
17 #include <linux/user.h>
18 #include <linux/security.h>
19 #include <linux/audit.h>
21 #include <asm/uaccess.h>
22 #include <asm/pgtable.h>
23 #include <asm/system.h>
24 #include <asm/processor.h>
26 #include <asm/debugreg.h>
29 #include <asm/proto.h>
33 * does not yet catch signals sent when the child dies.
34 * in exit.c or in signal.c.
37 /* determines which flags the user has access to. */
38 /* 1 = access 0 = no access */
39 #define FLAG_MASK 0x44dd5UL
41 /* set's the trap flag. */
42 #define TRAP_FLAG 0x100UL
45 * eflags and offset of eflags on child stack..
47 #define EFLAGS offsetof(struct pt_regs, eflags)
48 #define EFL_OFFSET ((int)(EFLAGS-sizeof(struct pt_regs)))
51 * this routine will get a word off of the processes privileged stack.
52 * the offset is how far from the base addr as stored in the TSS.
53 * this routine assumes that all the privileged stacks are in our
56 static inline unsigned long get_stack_long(struct task_struct *task, int offset)
60 stack = (unsigned char *)task->thread.rsp0;
62 return (*((unsigned long *)stack));
66 * this routine will put a word on the processes privileged stack.
67 * the offset is how far from the base addr as stored in the TSS.
68 * this routine assumes that all the privileged stacks are in our
71 static inline long put_stack_long(struct task_struct *task, int offset,
74 unsigned char * stack;
76 stack = (unsigned char *) task->thread.rsp0;
78 *(unsigned long *) stack = data;
83 * Called by kernel/ptrace.c when detaching..
85 * Make sure the single step bit is not set.
87 void ptrace_disable(struct task_struct *child)
91 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
92 tmp = get_stack_long(child, EFL_OFFSET) & ~TRAP_FLAG;
93 put_stack_long(child, EFL_OFFSET, tmp);
96 static int putreg(struct task_struct *child,
97 unsigned long regno, unsigned long value)
101 /* Some code in the 64bit emulation may not be 64bit clean.
102 Don't take any chances. */
103 if (test_tsk_thread_flag(child, TIF_IA32))
106 case offsetof(struct user_regs_struct,fs):
107 if (value && (value & 3) != 3)
109 child->thread.fsindex = value & 0xffff;
111 case offsetof(struct user_regs_struct,gs):
112 if (value && (value & 3) != 3)
114 child->thread.gsindex = value & 0xffff;
116 case offsetof(struct user_regs_struct,ds):
117 if (value && (value & 3) != 3)
119 child->thread.ds = value & 0xffff;
121 case offsetof(struct user_regs_struct,es):
122 if (value && (value & 3) != 3)
124 child->thread.es = value & 0xffff;
126 case offsetof(struct user_regs_struct,ss):
127 if ((value & 3) != 3)
131 case offsetof(struct user_regs_struct,fs_base):
132 if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
134 child->thread.fs = value;
136 case offsetof(struct user_regs_struct,gs_base):
137 if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
139 child->thread.gs = value;
141 case offsetof(struct user_regs_struct, eflags):
143 tmp = get_stack_long(child, EFL_OFFSET);
147 case offsetof(struct user_regs_struct,cs):
148 if ((value & 3) != 3)
153 put_stack_long(child, regno - sizeof(struct pt_regs), value);
157 static unsigned long getreg(struct task_struct *child, unsigned long regno)
161 case offsetof(struct user_regs_struct, fs):
162 return child->thread.fsindex;
163 case offsetof(struct user_regs_struct, gs):
164 return child->thread.gsindex;
165 case offsetof(struct user_regs_struct, ds):
166 return child->thread.ds;
167 case offsetof(struct user_regs_struct, es):
168 return child->thread.es;
169 case offsetof(struct user_regs_struct, fs_base):
170 return child->thread.fs;
171 case offsetof(struct user_regs_struct, gs_base):
172 return child->thread.gs;
174 regno = regno - sizeof(struct pt_regs);
175 val = get_stack_long(child, regno);
176 if (test_tsk_thread_flag(child, TIF_IA32))
183 asmlinkage long sys_ptrace(long request, long pid, unsigned long addr, long data)
185 struct task_struct *child;
189 /* This lock_kernel fixes a subtle race with suid exec */
192 if (request == PTRACE_TRACEME) {
193 /* are we already being traced? */
194 if (current->ptrace & PT_PTRACED)
196 ret = security_ptrace(current->parent, current);
199 /* set the ptrace bit in the process flags. */
200 current->ptrace |= PT_PTRACED;
205 read_lock(&tasklist_lock);
206 child = find_task_by_pid(pid);
208 get_task_struct(child);
209 read_unlock(&tasklist_lock);
212 if (!vx_check(vx_task_xid(child), VX_WATCH|VX_IDENT))
216 if (pid == 1) /* you may not mess with init */
219 if (request == PTRACE_ATTACH) {
220 ret = ptrace_attach(child);
223 ret = ptrace_check_attach(child, request == PTRACE_KILL);
228 /* when I and D space are separate, these will need to be fixed. */
229 case PTRACE_PEEKTEXT: /* read word at location addr. */
230 case PTRACE_PEEKDATA: {
234 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
236 if (copied != sizeof(tmp))
238 ret = put_user(tmp,(unsigned long __user *) data);
242 /* read the word at location addr in the USER area. */
243 case PTRACE_PEEKUSR: {
248 addr > sizeof(struct user) - 7)
252 case 0 ... sizeof(struct user_regs_struct):
253 tmp = getreg(child, addr);
255 case offsetof(struct user, u_debugreg[0]):
256 tmp = child->thread.debugreg0;
258 case offsetof(struct user, u_debugreg[1]):
259 tmp = child->thread.debugreg1;
261 case offsetof(struct user, u_debugreg[2]):
262 tmp = child->thread.debugreg2;
264 case offsetof(struct user, u_debugreg[3]):
265 tmp = child->thread.debugreg3;
267 case offsetof(struct user, u_debugreg[6]):
268 tmp = child->thread.debugreg6;
270 case offsetof(struct user, u_debugreg[7]):
271 tmp = child->thread.debugreg7;
277 ret = put_user(tmp,(unsigned long __user *) data);
281 /* when I and D space are separate, this will have to be fixed. */
282 case PTRACE_POKETEXT: /* write the word at location addr. */
283 case PTRACE_POKEDATA:
285 if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
290 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
293 addr > sizeof(struct user) - 7)
297 case 0 ... sizeof(struct user_regs_struct):
298 ret = putreg(child, addr, data);
300 /* Disallows to set a breakpoint into the vsyscall */
301 case offsetof(struct user, u_debugreg[0]):
302 if (data >= TASK_SIZE-7) break;
303 child->thread.debugreg0 = data;
306 case offsetof(struct user, u_debugreg[1]):
307 if (data >= TASK_SIZE-7) break;
308 child->thread.debugreg1 = data;
311 case offsetof(struct user, u_debugreg[2]):
312 if (data >= TASK_SIZE-7) break;
313 child->thread.debugreg2 = data;
316 case offsetof(struct user, u_debugreg[3]):
317 if (data >= TASK_SIZE-7) break;
318 child->thread.debugreg3 = data;
321 case offsetof(struct user, u_debugreg[6]):
324 child->thread.debugreg6 = data;
327 case offsetof(struct user, u_debugreg[7]):
328 /* See arch/i386/kernel/ptrace.c for an explanation of
329 * this awkward check.*/
330 data &= ~DR_CONTROL_RESERVED;
332 if ((0x5454 >> ((data >> (16 + 4*i)) & 0xf)) & 1)
335 child->thread.debugreg7 = data;
341 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
342 case PTRACE_CONT: { /* restart after signal. */
346 if ((unsigned long) data > _NSIG)
348 if (request == PTRACE_SYSCALL)
349 set_tsk_thread_flag(child,TIF_SYSCALL_TRACE);
351 clear_tsk_thread_flag(child,TIF_SYSCALL_TRACE);
352 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
353 child->exit_code = data;
354 /* make sure the single step bit is not set. */
355 tmp = get_stack_long(child, EFL_OFFSET);
357 put_stack_long(child, EFL_OFFSET,tmp);
358 wake_up_process(child);
363 #ifdef CONFIG_IA32_EMULATION
364 /* This makes only sense with 32bit programs. Allow a
365 64bit debugger to fully examine them too. Better
366 don't use it against 64bit processes, use
367 PTRACE_ARCH_PRCTL instead. */
368 case PTRACE_SET_THREAD_AREA: {
369 struct user_desc __user *p;
371 p = (struct user_desc __user *)data;
372 get_user(old, &p->entry_number);
373 put_user(addr, &p->entry_number);
374 ret = do_set_thread_area(&child->thread, p);
375 put_user(old, &p->entry_number);
377 case PTRACE_GET_THREAD_AREA:
378 p = (struct user_desc __user *)data;
379 get_user(old, &p->entry_number);
380 put_user(addr, &p->entry_number);
381 ret = do_get_thread_area(&child->thread, p);
382 put_user(old, &p->entry_number);
386 /* normal 64bit interface to access TLS data.
387 Works just like arch_prctl, except that the arguments
389 case PTRACE_ARCH_PRCTL:
390 ret = do_arch_prctl(child, data, addr);
394 * make the child exit. Best I can do is send it a sigkill.
395 * perhaps it should be put in the status that it wants to
402 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
404 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
405 child->exit_code = SIGKILL;
406 /* make sure the single step bit is not set. */
407 tmp = get_stack_long(child, EFL_OFFSET) & ~TRAP_FLAG;
408 put_stack_long(child, EFL_OFFSET, tmp);
409 wake_up_process(child);
413 case PTRACE_SINGLESTEP: { /* set the trap flag. */
417 if ((unsigned long) data > _NSIG)
419 clear_tsk_thread_flag(child,TIF_SYSCALL_TRACE);
420 if ((child->ptrace & PT_DTRACE) == 0) {
421 /* Spurious delayed TF traps may occur */
422 child->ptrace |= PT_DTRACE;
424 tmp = get_stack_long(child, EFL_OFFSET) | TRAP_FLAG;
425 put_stack_long(child, EFL_OFFSET, tmp);
426 set_tsk_thread_flag(child, TIF_SINGLESTEP);
427 child->exit_code = data;
428 /* give it a chance to run. */
429 wake_up_process(child);
435 /* detach a process that was attached. */
436 ret = ptrace_detach(child, data);
439 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
440 if (!access_ok(VERIFY_WRITE, (unsigned __user *)data,
441 sizeof(struct user_regs_struct))) {
446 for (ui = 0; ui < sizeof(struct user_regs_struct); ui += sizeof(long)) {
447 ret |= __put_user(getreg(child, ui),(unsigned long __user *) data);
448 data += sizeof(long);
453 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
455 if (!access_ok(VERIFY_READ, (unsigned __user *)data,
456 sizeof(struct user_regs_struct))) {
461 for (ui = 0; ui < sizeof(struct user_regs_struct); ui += sizeof(long)) {
462 ret |= __get_user(tmp, (unsigned long __user *) data);
463 putreg(child, ui, tmp);
464 data += sizeof(long);
469 case PTRACE_GETFPREGS: { /* Get the child extended FPU state. */
470 if (!access_ok(VERIFY_WRITE, (unsigned __user *)data,
471 sizeof(struct user_i387_struct))) {
475 ret = get_fpregs((struct user_i387_struct __user *)data, child);
479 case PTRACE_SETFPREGS: { /* Set the child extended FPU state. */
480 if (!access_ok(VERIFY_READ, (unsigned __user *)data,
481 sizeof(struct user_i387_struct))) {
485 set_stopped_child_used_math(child);
486 ret = set_fpregs(child, (struct user_i387_struct __user *)data);
491 ret = ptrace_request(child, request, addr, data);
495 put_task_struct(child);
501 static void syscall_trace(struct pt_regs *regs)
505 printk("trace %s rip %lx rsp %lx rax %d origrax %d caller %lx tiflags %x ptrace %x\n",
507 regs->rip, regs->rsp, regs->rax, regs->orig_rax, __builtin_return_address(0),
508 current_thread_info()->flags, current->ptrace);
511 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
514 * this isn't the same as continuing with a signal, but it will do
515 * for normal use. strace only continues with a signal if the
516 * stopping signal is not SIGTRAP. -brl
518 if (current->exit_code) {
519 send_sig(current->exit_code, current, 1);
520 current->exit_code = 0;
524 asmlinkage void syscall_trace_enter(struct pt_regs *regs)
526 if (unlikely(current->audit_context))
527 audit_syscall_entry(current, regs->orig_rax,
528 regs->rdi, regs->rsi,
529 regs->rdx, regs->r10);
531 if (test_thread_flag(TIF_SYSCALL_TRACE)
532 && (current->ptrace & PT_PTRACED))
536 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
538 if (unlikely(current->audit_context))
539 audit_syscall_exit(current, regs->rax);
541 if ((test_thread_flag(TIF_SYSCALL_TRACE)
542 || test_thread_flag(TIF_SINGLESTEP))
543 && (current->ptrace & PT_PTRACED))