1 /* By Ross Biro 1/23/92 */
3 * Pentium III FXSR, SSE support
4 * Gareth Hughes <gareth@valinux.com>, May 2000
7 * Markus Metzger <markus.t.metzger@intel.com>, Dec 2007
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
13 #include <linux/smp.h>
14 #include <linux/errno.h>
15 #include <linux/ptrace.h>
16 #include <linux/regset.h>
17 #include <linux/user.h>
18 #include <linux/elf.h>
19 #include <linux/security.h>
20 #include <linux/audit.h>
21 #include <linux/seccomp.h>
22 #include <linux/signal.h>
24 #include <asm/uaccess.h>
25 #include <asm/pgtable.h>
26 #include <asm/system.h>
27 #include <asm/processor.h>
29 #include <asm/debugreg.h>
32 #include <asm/prctl.h>
33 #include <asm/proto.h>
46 * does not yet catch signals sent when the child dies.
47 * in exit.c or in signal.c.
51 * Determines which flags the user has access to [1 = access, 0 = no access].
53 #define FLAG_MASK_32 ((unsigned long) \
54 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
55 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
56 X86_EFLAGS_SF | X86_EFLAGS_TF | \
57 X86_EFLAGS_DF | X86_EFLAGS_OF | \
58 X86_EFLAGS_RF | X86_EFLAGS_AC))
61 * Determines whether a value may be installed in a segment register.
63 static inline bool invalid_selector(u16 value)
65 return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
70 #define FLAG_MASK FLAG_MASK_32
72 static long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
74 BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
78 return ®s->bx + regno;
81 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
84 * Returning the value truncates it to 16 bits.
87 if (offset != offsetof(struct user_regs_struct, gs))
88 retval = *pt_regs_access(task_pt_regs(task), offset);
90 retval = task->thread.gs;
92 savesegment(gs, retval);
97 static int set_segment_reg(struct task_struct *task,
98 unsigned long offset, u16 value)
101 * The value argument was already truncated to 16 bits.
103 if (invalid_selector(value))
107 * For %cs and %ss we cannot permit a null selector.
108 * We can permit a bogus selector as long as it has USER_RPL.
109 * Null selectors are fine for other segment registers, but
110 * we will never get back to user mode with invalid %cs or %ss
111 * and will take the trap in iret instead. Much code relies
112 * on user_mode() to distinguish a user trap frame (which can
113 * safely use invalid selectors) from a kernel trap frame.
116 case offsetof(struct user_regs_struct, cs):
117 case offsetof(struct user_regs_struct, ss):
118 if (unlikely(value == 0))
122 *pt_regs_access(task_pt_regs(task), offset) = value;
125 case offsetof(struct user_regs_struct, gs):
126 task->thread.gs = value;
129 * The user-mode %gs is not affected by
130 * kernel entry, so we must update the CPU.
132 loadsegment(gs, value);
138 static unsigned long debugreg_addr_limit(struct task_struct *task)
140 return TASK_SIZE - 3;
143 #else /* CONFIG_X86_64 */
145 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
147 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
149 BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
150 return ®s->r15 + (offset / sizeof(regs->r15));
153 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
156 * Returning the value truncates it to 16 bits.
161 case offsetof(struct user_regs_struct, fs):
162 if (task == current) {
163 /* Older gas can't assemble movq %?s,%r?? */
164 asm("movl %%fs,%0" : "=r" (seg));
167 return task->thread.fsindex;
168 case offsetof(struct user_regs_struct, gs):
169 if (task == current) {
170 asm("movl %%gs,%0" : "=r" (seg));
173 return task->thread.gsindex;
174 case offsetof(struct user_regs_struct, ds):
175 if (task == current) {
176 asm("movl %%ds,%0" : "=r" (seg));
179 return task->thread.ds;
180 case offsetof(struct user_regs_struct, es):
181 if (task == current) {
182 asm("movl %%es,%0" : "=r" (seg));
185 return task->thread.es;
187 case offsetof(struct user_regs_struct, cs):
188 case offsetof(struct user_regs_struct, ss):
191 return *pt_regs_access(task_pt_regs(task), offset);
194 static int set_segment_reg(struct task_struct *task,
195 unsigned long offset, u16 value)
198 * The value argument was already truncated to 16 bits.
200 if (invalid_selector(value))
204 case offsetof(struct user_regs_struct,fs):
206 * If this is setting fs as for normal 64-bit use but
207 * setting fs_base has implicitly changed it, leave it.
209 if ((value == FS_TLS_SEL && task->thread.fsindex == 0 &&
210 task->thread.fs != 0) ||
211 (value == 0 && task->thread.fsindex == FS_TLS_SEL &&
212 task->thread.fs == 0))
214 task->thread.fsindex = value;
216 loadsegment(fs, task->thread.fsindex);
218 case offsetof(struct user_regs_struct,gs):
220 * If this is setting gs as for normal 64-bit use but
221 * setting gs_base has implicitly changed it, leave it.
223 if ((value == GS_TLS_SEL && task->thread.gsindex == 0 &&
224 task->thread.gs != 0) ||
225 (value == 0 && task->thread.gsindex == GS_TLS_SEL &&
226 task->thread.gs == 0))
228 task->thread.gsindex = value;
230 load_gs_index(task->thread.gsindex);
232 case offsetof(struct user_regs_struct,ds):
233 task->thread.ds = value;
235 loadsegment(ds, task->thread.ds);
237 case offsetof(struct user_regs_struct,es):
238 task->thread.es = value;
240 loadsegment(es, task->thread.es);
244 * Can't actually change these in 64-bit mode.
246 case offsetof(struct user_regs_struct,cs):
247 if (unlikely(value == 0))
249 #ifdef CONFIG_IA32_EMULATION
250 if (test_tsk_thread_flag(task, TIF_IA32))
251 task_pt_regs(task)->cs = value;
254 case offsetof(struct user_regs_struct,ss):
255 if (unlikely(value == 0))
257 #ifdef CONFIG_IA32_EMULATION
258 if (test_tsk_thread_flag(task, TIF_IA32))
259 task_pt_regs(task)->ss = value;
267 static unsigned long debugreg_addr_limit(struct task_struct *task)
269 #ifdef CONFIG_IA32_EMULATION
270 if (test_tsk_thread_flag(task, TIF_IA32))
271 return IA32_PAGE_OFFSET - 3;
273 return TASK_SIZE64 - 7;
276 #endif /* CONFIG_X86_32 */
278 static unsigned long get_flags(struct task_struct *task)
280 unsigned long retval = task_pt_regs(task)->flags;
283 * If the debugger set TF, hide it from the readout.
285 if (test_tsk_thread_flag(task, TIF_FORCED_TF))
286 retval &= ~X86_EFLAGS_TF;
291 static int set_flags(struct task_struct *task, unsigned long value)
293 struct pt_regs *regs = task_pt_regs(task);
296 * If the user value contains TF, mark that
297 * it was not "us" (the debugger) that set it.
298 * If not, make sure it stays set if we had.
300 if (value & X86_EFLAGS_TF)
301 clear_tsk_thread_flag(task, TIF_FORCED_TF);
302 else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
303 value |= X86_EFLAGS_TF;
305 regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
310 static int putreg(struct task_struct *child,
311 unsigned long offset, unsigned long value)
314 case offsetof(struct user_regs_struct, cs):
315 case offsetof(struct user_regs_struct, ds):
316 case offsetof(struct user_regs_struct, es):
317 case offsetof(struct user_regs_struct, fs):
318 case offsetof(struct user_regs_struct, gs):
319 case offsetof(struct user_regs_struct, ss):
320 return set_segment_reg(child, offset, value);
322 case offsetof(struct user_regs_struct, flags):
323 return set_flags(child, value);
326 case offsetof(struct user_regs_struct,fs_base):
327 if (value >= TASK_SIZE_OF(child))
330 * When changing the segment base, use do_arch_prctl
331 * to set either thread.fs or thread.fsindex and the
332 * corresponding GDT slot.
334 if (child->thread.fs != value)
335 return do_arch_prctl(child, ARCH_SET_FS, value);
337 case offsetof(struct user_regs_struct,gs_base):
339 * Exactly the same here as the %fs handling above.
341 if (value >= TASK_SIZE_OF(child))
343 if (child->thread.gs != value)
344 return do_arch_prctl(child, ARCH_SET_GS, value);
349 *pt_regs_access(task_pt_regs(child), offset) = value;
353 static unsigned long getreg(struct task_struct *task, unsigned long offset)
356 case offsetof(struct user_regs_struct, cs):
357 case offsetof(struct user_regs_struct, ds):
358 case offsetof(struct user_regs_struct, es):
359 case offsetof(struct user_regs_struct, fs):
360 case offsetof(struct user_regs_struct, gs):
361 case offsetof(struct user_regs_struct, ss):
362 return get_segment_reg(task, offset);
364 case offsetof(struct user_regs_struct, flags):
365 return get_flags(task);
368 case offsetof(struct user_regs_struct, fs_base): {
370 * do_arch_prctl may have used a GDT slot instead of
371 * the MSR. To userland, it appears the same either
372 * way, except the %fs segment selector might not be 0.
374 unsigned int seg = task->thread.fsindex;
375 if (task->thread.fs != 0)
376 return task->thread.fs;
378 asm("movl %%fs,%0" : "=r" (seg));
379 if (seg != FS_TLS_SEL)
381 return get_desc_base(&task->thread.tls_array[FS_TLS]);
383 case offsetof(struct user_regs_struct, gs_base): {
385 * Exactly the same here as the %fs handling above.
387 unsigned int seg = task->thread.gsindex;
388 if (task->thread.gs != 0)
389 return task->thread.gs;
391 asm("movl %%gs,%0" : "=r" (seg));
392 if (seg != GS_TLS_SEL)
394 return get_desc_base(&task->thread.tls_array[GS_TLS]);
399 return *pt_regs_access(task_pt_regs(task), offset);
402 static int genregs_get(struct task_struct *target,
403 const struct user_regset *regset,
404 unsigned int pos, unsigned int count,
405 void *kbuf, void __user *ubuf)
408 unsigned long *k = kbuf;
410 *k++ = getreg(target, pos);
415 unsigned long __user *u = ubuf;
417 if (__put_user(getreg(target, pos), u++))
427 static int genregs_set(struct task_struct *target,
428 const struct user_regset *regset,
429 unsigned int pos, unsigned int count,
430 const void *kbuf, const void __user *ubuf)
434 const unsigned long *k = kbuf;
435 while (count > 0 && !ret) {
436 ret = putreg(target, pos, *k++);
441 const unsigned long __user *u = ubuf;
442 while (count > 0 && !ret) {
444 ret = __get_user(word, u++);
447 ret = putreg(target, pos, word);
456 * This function is trivial and will be inlined by the compiler.
457 * Having it separates the implementation details of debug
458 * registers from the interface details of ptrace.
460 static unsigned long ptrace_get_debugreg(struct task_struct *child, int n)
463 case 0: return child->thread.debugreg0;
464 case 1: return child->thread.debugreg1;
465 case 2: return child->thread.debugreg2;
466 case 3: return child->thread.debugreg3;
467 case 6: return child->thread.debugreg6;
468 case 7: return child->thread.debugreg7;
473 static int ptrace_set_debugreg(struct task_struct *child,
474 int n, unsigned long data)
478 if (unlikely(n == 4 || n == 5))
481 if (n < 4 && unlikely(data >= debugreg_addr_limit(child)))
485 case 0: child->thread.debugreg0 = data; break;
486 case 1: child->thread.debugreg1 = data; break;
487 case 2: child->thread.debugreg2 = data; break;
488 case 3: child->thread.debugreg3 = data; break;
491 if ((data & ~0xffffffffUL) != 0)
493 child->thread.debugreg6 = data;
498 * Sanity-check data. Take one half-byte at once with
499 * check = (val >> (16 + 4*i)) & 0xf. It contains the
500 * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits
501 * 2 and 3 are LENi. Given a list of invalid values,
502 * we do mask |= 1 << invalid_value, so that
503 * (mask >> check) & 1 is a correct test for invalid
506 * R/Wi contains the type of the breakpoint /
507 * watchpoint, LENi contains the length of the watched
508 * data in the watchpoint case.
510 * The invalid values are:
511 * - LENi == 0x10 (undefined), so mask |= 0x0f00. [32-bit]
512 * - R/Wi == 0x10 (break on I/O reads or writes), so
514 * - R/Wi == 0x00 && LENi != 0x00, so we have mask |=
517 * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54.
519 * See the Intel Manual "System Programming Guide",
522 * Note that LENi == 0x10 is defined on x86_64 in long
523 * mode (i.e. even for 32-bit userspace software, but
524 * 64-bit kernel), so the x86_64 mask value is 0x5454.
525 * See the AMD manual no. 24593 (AMD64 System Programming)
528 #define DR7_MASK 0x5f54
530 #define DR7_MASK 0x5554
532 data &= ~DR_CONTROL_RESERVED;
533 for (i = 0; i < 4; i++)
534 if ((DR7_MASK >> ((data >> (16 + 4*i)) & 0xf)) & 1)
536 child->thread.debugreg7 = data;
538 set_tsk_thread_flag(child, TIF_DEBUG);
540 clear_tsk_thread_flag(child, TIF_DEBUG);
547 static int ptrace_bts_get_size(struct task_struct *child)
549 if (!child->thread.ds_area_msr)
552 return ds_get_bts_index((void *)child->thread.ds_area_msr);
555 static int ptrace_bts_read_record(struct task_struct *child,
557 struct bts_struct __user *out)
559 struct bts_struct ret;
564 if (!child->thread.ds_area_msr)
570 bts_end = ds_get_bts_end((void *)child->thread.ds_area_msr);
571 if (bts_end <= index)
574 /* translate the ptrace bts index into the ds bts index */
575 bts_index = ds_get_bts_index((void *)child->thread.ds_area_msr);
576 bts_index -= (index + 1);
578 bts_index += bts_end;
580 retval = ds_read_bts((void *)child->thread.ds_area_msr,
585 if (copy_to_user(out, &ret, sizeof(ret)))
591 static int ptrace_bts_write_record(struct task_struct *child,
592 const struct bts_struct *in)
596 if (!child->thread.ds_area_msr)
599 retval = ds_write_bts((void *)child->thread.ds_area_msr, in);
606 static int ptrace_bts_clear(struct task_struct *child)
608 if (!child->thread.ds_area_msr)
611 return ds_clear((void *)child->thread.ds_area_msr);
614 static int ptrace_bts_drain(struct task_struct *child,
616 struct bts_struct __user *out)
619 void *ds = (void *)child->thread.ds_area_msr;
624 end = ds_get_bts_index(ds);
628 if (size < (end * sizeof(struct bts_struct)))
631 for (i = 0; i < end; i++, out++) {
632 struct bts_struct ret;
635 retval = ds_read_bts(ds, i, &ret);
639 if (copy_to_user(out, &ret, sizeof(ret)))
648 static int ptrace_bts_realloc(struct task_struct *child,
649 int size, int reduce_size)
651 unsigned long rlim, vm;
657 old_size = ds_get_bts_size((void *)child->thread.ds_area_msr);
661 ret = ds_free((void **)&child->thread.ds_area_msr);
666 old_size >>= PAGE_SHIFT;
668 current->mm->total_vm -= old_size;
669 current->mm->locked_vm -= old_size;
674 rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT;
675 vm = current->mm->total_vm + size;
682 size = rlim - current->mm->total_vm;
687 rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
688 vm = current->mm->locked_vm + size;
695 size = rlim - current->mm->locked_vm;
700 ret = ds_allocate((void **)&child->thread.ds_area_msr,
705 current->mm->total_vm += size;
706 current->mm->locked_vm += size;
709 if (child->thread.ds_area_msr)
710 set_tsk_thread_flag(child, TIF_DS_AREA_MSR);
712 clear_tsk_thread_flag(child, TIF_DS_AREA_MSR);
717 static int ptrace_bts_config(struct task_struct *child,
719 const struct ptrace_bts_config __user *ucfg)
721 struct ptrace_bts_config cfg;
722 int bts_size, ret = 0;
725 if (cfg_size < sizeof(cfg))
728 if (copy_from_user(&cfg, ucfg, sizeof(cfg)))
731 if ((int)cfg.size < 0)
735 ds = (void *)child->thread.ds_area_msr;
737 bts_size = ds_get_bts_size(ds);
741 cfg.size = PAGE_ALIGN(cfg.size);
743 if (bts_size != cfg.size) {
744 ret = ptrace_bts_realloc(child, cfg.size,
745 cfg.flags & PTRACE_BTS_O_CUT_SIZE);
749 ds = (void *)child->thread.ds_area_msr;
752 if (cfg.flags & PTRACE_BTS_O_SIGNAL)
753 ret = ds_set_overflow(ds, DS_O_SIGNAL);
755 ret = ds_set_overflow(ds, DS_O_WRAP);
759 if (cfg.flags & PTRACE_BTS_O_TRACE)
760 child->thread.debugctlmsr |= ds_debugctl_mask();
762 child->thread.debugctlmsr &= ~ds_debugctl_mask();
764 if (cfg.flags & PTRACE_BTS_O_SCHED)
765 set_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
767 clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
772 if (child->thread.debugctlmsr)
773 set_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
775 clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
780 child->thread.debugctlmsr &= ~ds_debugctl_mask();
781 clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
785 static int ptrace_bts_status(struct task_struct *child,
787 struct ptrace_bts_config __user *ucfg)
789 void *ds = (void *)child->thread.ds_area_msr;
790 struct ptrace_bts_config cfg;
792 if (cfg_size < sizeof(cfg))
795 memset(&cfg, 0, sizeof(cfg));
798 cfg.size = ds_get_bts_size(ds);
800 if (ds_get_overflow(ds) == DS_O_SIGNAL)
801 cfg.flags |= PTRACE_BTS_O_SIGNAL;
803 if (test_tsk_thread_flag(child, TIF_DEBUGCTLMSR) &&
804 child->thread.debugctlmsr & ds_debugctl_mask())
805 cfg.flags |= PTRACE_BTS_O_TRACE;
807 if (test_tsk_thread_flag(child, TIF_BTS_TRACE_TS))
808 cfg.flags |= PTRACE_BTS_O_SCHED;
811 cfg.bts_size = sizeof(struct bts_struct);
813 if (copy_to_user(ucfg, &cfg, sizeof(cfg)))
819 void ptrace_bts_take_timestamp(struct task_struct *tsk,
820 enum bts_qualifier qualifier)
822 struct bts_struct rec = {
823 .qualifier = qualifier,
824 .variant.jiffies = jiffies_64
827 ptrace_bts_write_record(tsk, &rec);
831 * Called by kernel/ptrace.c when detaching..
833 * Make sure the single step bit is not set.
835 void ptrace_disable(struct task_struct *child)
837 user_disable_single_step(child);
838 #ifdef TIF_SYSCALL_EMU
839 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
841 if (child->thread.ds_area_msr) {
842 ptrace_bts_realloc(child, 0, 0);
843 child->thread.debugctlmsr &= ~ds_debugctl_mask();
844 if (!child->thread.debugctlmsr)
845 clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
846 clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
850 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
851 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
854 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
857 unsigned long __user *datap = (unsigned long __user *)data;
860 /* read the word at location addr in the USER area. */
861 case PTRACE_PEEKUSR: {
865 if ((addr & (sizeof(data) - 1)) || addr < 0 ||
866 addr >= sizeof(struct user))
869 tmp = 0; /* Default return condition */
870 if (addr < sizeof(struct user_regs_struct))
871 tmp = getreg(child, addr);
872 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
873 addr <= offsetof(struct user, u_debugreg[7])) {
874 addr -= offsetof(struct user, u_debugreg[0]);
875 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
877 ret = put_user(tmp, datap);
881 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
883 if ((addr & (sizeof(data) - 1)) || addr < 0 ||
884 addr >= sizeof(struct user))
887 if (addr < sizeof(struct user_regs_struct))
888 ret = putreg(child, addr, data);
889 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
890 addr <= offsetof(struct user, u_debugreg[7])) {
891 addr -= offsetof(struct user, u_debugreg[0]);
892 ret = ptrace_set_debugreg(child,
893 addr / sizeof(data), data);
897 case PTRACE_GETREGS: /* Get all gp regs from the child. */
898 return copy_regset_to_user(child,
899 task_user_regset_view(current),
901 0, sizeof(struct user_regs_struct),
904 case PTRACE_SETREGS: /* Set all gp regs in the child. */
905 return copy_regset_from_user(child,
906 task_user_regset_view(current),
908 0, sizeof(struct user_regs_struct),
911 case PTRACE_GETFPREGS: /* Get the child FPU state. */
912 return copy_regset_to_user(child,
913 task_user_regset_view(current),
915 0, sizeof(struct user_i387_struct),
918 case PTRACE_SETFPREGS: /* Set the child FPU state. */
919 return copy_regset_from_user(child,
920 task_user_regset_view(current),
922 0, sizeof(struct user_i387_struct),
926 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
927 return copy_regset_to_user(child, &user_x86_32_view,
929 0, sizeof(struct user_fxsr_struct),
932 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
933 return copy_regset_from_user(child, &user_x86_32_view,
935 0, sizeof(struct user_fxsr_struct),
939 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
940 case PTRACE_GET_THREAD_AREA:
943 ret = do_get_thread_area(child, addr,
944 (struct user_desc __user *) data);
947 case PTRACE_SET_THREAD_AREA:
950 ret = do_set_thread_area(child, addr,
951 (struct user_desc __user *) data, 0);
956 /* normal 64bit interface to access TLS data.
957 Works just like arch_prctl, except that the arguments
959 case PTRACE_ARCH_PRCTL:
960 ret = do_arch_prctl(child, data, addr);
964 case PTRACE_BTS_CONFIG:
965 ret = ptrace_bts_config
966 (child, data, (struct ptrace_bts_config __user *)addr);
969 case PTRACE_BTS_STATUS:
970 ret = ptrace_bts_status
971 (child, data, (struct ptrace_bts_config __user *)addr);
974 case PTRACE_BTS_SIZE:
975 ret = ptrace_bts_get_size(child);
979 ret = ptrace_bts_read_record
980 (child, data, (struct bts_struct __user *) addr);
983 case PTRACE_BTS_CLEAR:
984 ret = ptrace_bts_clear(child);
987 case PTRACE_BTS_DRAIN:
988 ret = ptrace_bts_drain
989 (child, data, (struct bts_struct __user *) addr);
993 ret = ptrace_request(child, request, addr, data);
1000 #ifdef CONFIG_IA32_EMULATION
1002 #include <linux/compat.h>
1003 #include <linux/syscalls.h>
1004 #include <asm/ia32.h>
1005 #include <asm/user32.h>
1008 case offsetof(struct user32, regs.l): \
1009 regs->q = value; break
1012 case offsetof(struct user32, regs.rs): \
1013 return set_segment_reg(child, \
1014 offsetof(struct user_regs_struct, rs), \
1018 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
1020 struct pt_regs *regs = task_pt_regs(child);
1038 R32(orig_eax, orig_ax);
1042 case offsetof(struct user32, regs.eflags):
1043 return set_flags(child, value);
1045 case offsetof(struct user32, u_debugreg[0]) ...
1046 offsetof(struct user32, u_debugreg[7]):
1047 regno -= offsetof(struct user32, u_debugreg[0]);
1048 return ptrace_set_debugreg(child, regno / 4, value);
1051 if (regno > sizeof(struct user32) || (regno & 3))
1055 * Other dummy fields in the virtual user structure
1067 case offsetof(struct user32, regs.l): \
1068 *val = regs->q; break
1071 case offsetof(struct user32, regs.rs): \
1072 *val = get_segment_reg(child, \
1073 offsetof(struct user_regs_struct, rs)); \
1076 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
1078 struct pt_regs *regs = task_pt_regs(child);
1096 R32(orig_eax, orig_ax);
1100 case offsetof(struct user32, regs.eflags):
1101 *val = get_flags(child);
1104 case offsetof(struct user32, u_debugreg[0]) ...
1105 offsetof(struct user32, u_debugreg[7]):
1106 regno -= offsetof(struct user32, u_debugreg[0]);
1107 *val = ptrace_get_debugreg(child, regno / 4);
1111 if (regno > sizeof(struct user32) || (regno & 3))
1115 * Other dummy fields in the virtual user structure
1127 static int genregs32_get(struct task_struct *target,
1128 const struct user_regset *regset,
1129 unsigned int pos, unsigned int count,
1130 void *kbuf, void __user *ubuf)
1133 compat_ulong_t *k = kbuf;
1135 getreg32(target, pos, k++);
1136 count -= sizeof(*k);
1140 compat_ulong_t __user *u = ubuf;
1142 compat_ulong_t word;
1143 getreg32(target, pos, &word);
1144 if (__put_user(word, u++))
1146 count -= sizeof(*u);
1154 static int genregs32_set(struct task_struct *target,
1155 const struct user_regset *regset,
1156 unsigned int pos, unsigned int count,
1157 const void *kbuf, const void __user *ubuf)
1161 const compat_ulong_t *k = kbuf;
1162 while (count > 0 && !ret) {
1163 ret = putreg(target, pos, *k++);
1164 count -= sizeof(*k);
1168 const compat_ulong_t __user *u = ubuf;
1169 while (count > 0 && !ret) {
1170 compat_ulong_t word;
1171 ret = __get_user(word, u++);
1174 ret = putreg(target, pos, word);
1175 count -= sizeof(*u);
1182 static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
1184 siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t));
1185 compat_siginfo_t __user *si32 = compat_ptr(data);
1189 if (request == PTRACE_SETSIGINFO) {
1190 memset(&ssi, 0, sizeof(siginfo_t));
1191 ret = copy_siginfo_from_user32(&ssi, si32);
1194 if (copy_to_user(si, &ssi, sizeof(siginfo_t)))
1197 ret = sys_ptrace(request, pid, addr, (unsigned long)si);
1200 if (request == PTRACE_GETSIGINFO) {
1201 if (copy_from_user(&ssi, si, sizeof(siginfo_t)))
1203 ret = copy_siginfo_to_user32(si32, &ssi);
1208 asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
1210 struct task_struct *child;
1211 struct pt_regs *childregs;
1212 void __user *datap = compat_ptr(data);
1217 case PTRACE_TRACEME:
1221 case PTRACE_SINGLESTEP:
1222 case PTRACE_SINGLEBLOCK:
1224 case PTRACE_SYSCALL:
1225 case PTRACE_OLDSETOPTIONS:
1226 case PTRACE_SETOPTIONS:
1227 case PTRACE_SET_THREAD_AREA:
1228 case PTRACE_GET_THREAD_AREA:
1229 case PTRACE_BTS_CONFIG:
1230 case PTRACE_BTS_STATUS:
1231 case PTRACE_BTS_SIZE:
1232 case PTRACE_BTS_GET:
1233 case PTRACE_BTS_CLEAR:
1234 case PTRACE_BTS_DRAIN:
1235 return sys_ptrace(request, pid, addr, data);
1240 case PTRACE_PEEKTEXT:
1241 case PTRACE_PEEKDATA:
1242 case PTRACE_POKEDATA:
1243 case PTRACE_POKETEXT:
1244 case PTRACE_POKEUSR:
1245 case PTRACE_PEEKUSR:
1246 case PTRACE_GETREGS:
1247 case PTRACE_SETREGS:
1248 case PTRACE_SETFPREGS:
1249 case PTRACE_GETFPREGS:
1250 case PTRACE_SETFPXREGS:
1251 case PTRACE_GETFPXREGS:
1252 case PTRACE_GETEVENTMSG:
1255 case PTRACE_SETSIGINFO:
1256 case PTRACE_GETSIGINFO:
1257 return ptrace32_siginfo(request, pid, addr, data);
1260 child = ptrace_get_task_struct(pid);
1262 return PTR_ERR(child);
1264 ret = ptrace_check_attach(child, request == PTRACE_KILL);
1268 childregs = task_pt_regs(child);
1271 case PTRACE_PEEKUSR:
1272 ret = getreg32(child, addr, &val);
1274 ret = put_user(val, (__u32 __user *)datap);
1277 case PTRACE_POKEUSR:
1278 ret = putreg32(child, addr, data);
1281 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1282 return copy_regset_to_user(child, &user_x86_32_view,
1284 0, sizeof(struct user_regs_struct32),
1287 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1288 return copy_regset_from_user(child, &user_x86_32_view,
1290 sizeof(struct user_regs_struct32),
1293 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1294 return copy_regset_to_user(child, &user_x86_32_view,
1296 sizeof(struct user_i387_ia32_struct),
1299 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1300 return copy_regset_from_user(
1301 child, &user_x86_32_view, REGSET_FP,
1302 0, sizeof(struct user_i387_ia32_struct), datap);
1304 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1305 return copy_regset_to_user(child, &user_x86_32_view,
1307 sizeof(struct user32_fxsr_struct),
1310 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1311 return copy_regset_from_user(child, &user_x86_32_view,
1313 sizeof(struct user32_fxsr_struct),
1317 return compat_ptrace_request(child, request, addr, data);
1321 put_task_struct(child);
1325 #endif /* CONFIG_IA32_EMULATION */
1327 #ifdef CONFIG_X86_64
1329 static const struct user_regset x86_64_regsets[] = {
1330 [REGSET_GENERAL] = {
1331 .core_note_type = NT_PRSTATUS,
1332 .n = sizeof(struct user_regs_struct) / sizeof(long),
1333 .size = sizeof(long), .align = sizeof(long),
1334 .get = genregs_get, .set = genregs_set
1337 .core_note_type = NT_PRFPREG,
1338 .n = sizeof(struct user_i387_struct) / sizeof(long),
1339 .size = sizeof(long), .align = sizeof(long),
1340 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1344 static const struct user_regset_view user_x86_64_view = {
1345 .name = "x86_64", .e_machine = EM_X86_64,
1346 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1349 #else /* CONFIG_X86_32 */
1351 #define user_regs_struct32 user_regs_struct
1352 #define genregs32_get genregs_get
1353 #define genregs32_set genregs_set
1355 #endif /* CONFIG_X86_64 */
1357 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1358 static const struct user_regset x86_32_regsets[] = {
1359 [REGSET_GENERAL] = {
1360 .core_note_type = NT_PRSTATUS,
1361 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1362 .size = sizeof(u32), .align = sizeof(u32),
1363 .get = genregs32_get, .set = genregs32_set
1366 .core_note_type = NT_PRFPREG,
1367 .n = sizeof(struct user_i387_struct) / sizeof(u32),
1368 .size = sizeof(u32), .align = sizeof(u32),
1369 .active = fpregs_active, .get = fpregs_get, .set = fpregs_set
1372 .core_note_type = NT_PRXFPREG,
1373 .n = sizeof(struct user_i387_struct) / sizeof(u32),
1374 .size = sizeof(u32), .align = sizeof(u32),
1375 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1378 .core_note_type = NT_386_TLS,
1379 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1380 .size = sizeof(struct user_desc),
1381 .align = sizeof(struct user_desc),
1382 .active = regset_tls_active,
1383 .get = regset_tls_get, .set = regset_tls_set
1387 static const struct user_regset_view user_x86_32_view = {
1388 .name = "i386", .e_machine = EM_386,
1389 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1393 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1395 #ifdef CONFIG_IA32_EMULATION
1396 if (test_tsk_thread_flag(task, TIF_IA32))
1398 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1399 return &user_x86_32_view;
1401 #ifdef CONFIG_X86_64
1402 return &user_x86_64_view;
1406 #ifdef CONFIG_X86_32
1408 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
1410 struct siginfo info;
1412 tsk->thread.trap_no = 1;
1413 tsk->thread.error_code = error_code;
1415 memset(&info, 0, sizeof(info));
1416 info.si_signo = SIGTRAP;
1417 info.si_code = TRAP_BRKPT;
1420 info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL;
1422 /* Send us the fake SIGTRAP */
1423 force_sig_info(SIGTRAP, &info, tsk);
1426 /* notification of system call entry/exit
1427 * - triggered by current->work.syscall_trace
1429 __attribute__((regparm(3)))
1430 int do_syscall_trace(struct pt_regs *regs, int entryexit)
1432 int is_sysemu = test_thread_flag(TIF_SYSCALL_EMU);
1434 * With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP for syscall
1437 int is_singlestep = !is_sysemu && test_thread_flag(TIF_SINGLESTEP);
1440 /* do the secure computing check first */
1442 secure_computing(regs->orig_ax);
1444 if (unlikely(current->audit_context)) {
1446 audit_syscall_exit(AUDITSC_RESULT(regs->ax),
1448 /* Debug traps, when using PTRACE_SINGLESTEP, must be sent only
1449 * on the syscall exit path. Normally, when TIF_SYSCALL_AUDIT is
1450 * not used, entry.S will call us only on syscall exit, not
1451 * entry; so when TIF_SYSCALL_AUDIT is used we must avoid
1452 * calling send_sigtrap() on syscall entry.
1454 * Note that when PTRACE_SYSEMU_SINGLESTEP is used,
1455 * is_singlestep is false, despite his name, so we will still do
1456 * the correct thing.
1458 else if (is_singlestep)
1462 if (!(current->ptrace & PT_PTRACED))
1465 /* If a process stops on the 1st tracepoint with SYSCALL_TRACE
1466 * and then is resumed with SYSEMU_SINGLESTEP, it will come in
1467 * here. We have to check this and return */
1468 if (is_sysemu && entryexit)
1471 /* Fake a debug trap */
1473 send_sigtrap(current, regs, 0);
1475 if (!test_thread_flag(TIF_SYSCALL_TRACE) && !is_sysemu)
1478 /* the 0x80 provides a way for the tracing parent to distinguish
1479 between a syscall stop and SIGTRAP delivery */
1480 /* Note that the debugger could change the result of test_thread_flag!*/
1481 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ? 0x80:0));
1484 * this isn't the same as continuing with a signal, but it will do
1485 * for normal use. strace only continues with a signal if the
1486 * stopping signal is not SIGTRAP. -brl
1488 if (current->exit_code) {
1489 send_sig(current->exit_code, current, 1);
1490 current->exit_code = 0;
1494 if (unlikely(current->audit_context) && !entryexit)
1495 audit_syscall_entry(AUDIT_ARCH_I386, regs->orig_ax,
1496 regs->bx, regs->cx, regs->dx, regs->si);
1500 regs->orig_ax = -1; /* force skip of syscall restarting */
1501 if (unlikely(current->audit_context))
1502 audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
1506 #else /* CONFIG_X86_64 */
1508 static void syscall_trace(struct pt_regs *regs)
1512 printk("trace %s ip %lx sp %lx ax %d origrax %d caller %lx tiflags %x ptrace %x\n",
1514 regs->ip, regs->sp, regs->ax, regs->orig_ax, __builtin_return_address(0),
1515 current_thread_info()->flags, current->ptrace);
1518 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
1521 * this isn't the same as continuing with a signal, but it will do
1522 * for normal use. strace only continues with a signal if the
1523 * stopping signal is not SIGTRAP. -brl
1525 if (current->exit_code) {
1526 send_sig(current->exit_code, current, 1);
1527 current->exit_code = 0;
1531 asmlinkage void syscall_trace_enter(struct pt_regs *regs)
1533 /* do the secure computing check first */
1534 secure_computing(regs->orig_ax);
1536 if (test_thread_flag(TIF_SYSCALL_TRACE)
1537 && (current->ptrace & PT_PTRACED))
1538 syscall_trace(regs);
1540 if (unlikely(current->audit_context)) {
1541 if (test_thread_flag(TIF_IA32)) {
1542 audit_syscall_entry(AUDIT_ARCH_I386,
1545 regs->dx, regs->si);
1547 audit_syscall_entry(AUDIT_ARCH_X86_64,
1550 regs->dx, regs->r10);
1555 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1557 if (unlikely(current->audit_context))
1558 audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
1560 if ((test_thread_flag(TIF_SYSCALL_TRACE)
1561 || test_thread_flag(TIF_SINGLESTEP))
1562 && (current->ptrace & PT_PTRACED))
1563 syscall_trace(regs);
1566 #endif /* CONFIG_X86_32 */