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);
549 static int ptrace_bts_get_size(struct task_struct *child)
551 if (!child->thread.ds_area_msr)
554 return ds_get_bts_index((void *)child->thread.ds_area_msr);
557 static int ptrace_bts_read_record(struct task_struct *child,
559 struct bts_struct __user *out)
561 struct bts_struct ret;
566 if (!child->thread.ds_area_msr)
572 bts_end = ds_get_bts_end((void *)child->thread.ds_area_msr);
573 if (bts_end <= index)
576 /* translate the ptrace bts index into the ds bts index */
577 bts_index = ds_get_bts_index((void *)child->thread.ds_area_msr);
578 bts_index -= (index + 1);
580 bts_index += bts_end;
582 retval = ds_read_bts((void *)child->thread.ds_area_msr,
587 if (copy_to_user(out, &ret, sizeof(ret)))
593 static int ptrace_bts_write_record(struct task_struct *child,
594 const struct bts_struct *in)
598 if (!child->thread.ds_area_msr)
601 retval = ds_write_bts((void *)child->thread.ds_area_msr, in);
608 static int ptrace_bts_clear(struct task_struct *child)
610 if (!child->thread.ds_area_msr)
613 return ds_clear((void *)child->thread.ds_area_msr);
616 static int ptrace_bts_drain(struct task_struct *child,
618 struct bts_struct __user *out)
621 void *ds = (void *)child->thread.ds_area_msr;
626 end = ds_get_bts_index(ds);
630 if (size < (end * sizeof(struct bts_struct)))
633 for (i = 0; i < end; i++, out++) {
634 struct bts_struct ret;
637 retval = ds_read_bts(ds, i, &ret);
641 if (copy_to_user(out, &ret, sizeof(ret)))
650 static int ptrace_bts_realloc(struct task_struct *child,
651 int size, int reduce_size)
653 unsigned long rlim, vm;
659 old_size = ds_get_bts_size((void *)child->thread.ds_area_msr);
663 ret = ds_free((void **)&child->thread.ds_area_msr);
668 old_size >>= PAGE_SHIFT;
670 current->mm->total_vm -= old_size;
671 current->mm->locked_vm -= old_size;
676 rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT;
677 vm = current->mm->total_vm + size;
684 size = rlim - current->mm->total_vm;
689 rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
690 vm = current->mm->locked_vm + size;
697 size = rlim - current->mm->locked_vm;
702 ret = ds_allocate((void **)&child->thread.ds_area_msr,
707 current->mm->total_vm += size;
708 current->mm->locked_vm += size;
711 if (child->thread.ds_area_msr)
712 set_tsk_thread_flag(child, TIF_DS_AREA_MSR);
714 clear_tsk_thread_flag(child, TIF_DS_AREA_MSR);
719 static int ptrace_bts_config(struct task_struct *child,
721 const struct ptrace_bts_config __user *ucfg)
723 struct ptrace_bts_config cfg;
724 int bts_size, ret = 0;
727 if (cfg_size < sizeof(cfg))
730 if (copy_from_user(&cfg, ucfg, sizeof(cfg)))
733 if ((int)cfg.size < 0)
737 ds = (void *)child->thread.ds_area_msr;
739 bts_size = ds_get_bts_size(ds);
743 cfg.size = PAGE_ALIGN(cfg.size);
745 if (bts_size != cfg.size) {
746 ret = ptrace_bts_realloc(child, cfg.size,
747 cfg.flags & PTRACE_BTS_O_CUT_SIZE);
751 ds = (void *)child->thread.ds_area_msr;
754 if (cfg.flags & PTRACE_BTS_O_SIGNAL)
755 ret = ds_set_overflow(ds, DS_O_SIGNAL);
757 ret = ds_set_overflow(ds, DS_O_WRAP);
761 if (cfg.flags & PTRACE_BTS_O_TRACE)
762 child->thread.debugctlmsr |= ds_debugctl_mask();
764 child->thread.debugctlmsr &= ~ds_debugctl_mask();
766 if (cfg.flags & PTRACE_BTS_O_SCHED)
767 set_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
769 clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
774 if (child->thread.debugctlmsr)
775 set_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
777 clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
782 child->thread.debugctlmsr &= ~ds_debugctl_mask();
783 clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
787 static int ptrace_bts_status(struct task_struct *child,
789 struct ptrace_bts_config __user *ucfg)
791 void *ds = (void *)child->thread.ds_area_msr;
792 struct ptrace_bts_config cfg;
794 if (cfg_size < sizeof(cfg))
797 memset(&cfg, 0, sizeof(cfg));
800 cfg.size = ds_get_bts_size(ds);
802 if (ds_get_overflow(ds) == DS_O_SIGNAL)
803 cfg.flags |= PTRACE_BTS_O_SIGNAL;
805 if (test_tsk_thread_flag(child, TIF_DEBUGCTLMSR) &&
806 child->thread.debugctlmsr & ds_debugctl_mask())
807 cfg.flags |= PTRACE_BTS_O_TRACE;
809 if (test_tsk_thread_flag(child, TIF_BTS_TRACE_TS))
810 cfg.flags |= PTRACE_BTS_O_SCHED;
813 cfg.bts_size = sizeof(struct bts_struct);
815 if (copy_to_user(ucfg, &cfg, sizeof(cfg)))
821 void ptrace_bts_take_timestamp(struct task_struct *tsk,
822 enum bts_qualifier qualifier)
824 struct bts_struct rec = {
825 .qualifier = qualifier,
826 .variant.jiffies = jiffies_64
829 ptrace_bts_write_record(tsk, &rec);
834 * Called by kernel/ptrace.c when detaching..
836 * Make sure the single step bit is not set.
838 void ptrace_disable(struct task_struct *child)
840 user_disable_single_step(child);
841 #ifdef TIF_SYSCALL_EMU
842 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
844 if (child->thread.ds_area_msr) {
846 ptrace_bts_realloc(child, 0, 0);
848 child->thread.debugctlmsr &= ~ds_debugctl_mask();
849 if (!child->thread.debugctlmsr)
850 clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
851 clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
855 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
856 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
859 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
862 unsigned long __user *datap = (unsigned long __user *)data;
865 /* read the word at location addr in the USER area. */
866 case PTRACE_PEEKUSR: {
870 if ((addr & (sizeof(data) - 1)) || addr < 0 ||
871 addr >= sizeof(struct user))
874 tmp = 0; /* Default return condition */
875 if (addr < sizeof(struct user_regs_struct))
876 tmp = getreg(child, addr);
877 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
878 addr <= offsetof(struct user, u_debugreg[7])) {
879 addr -= offsetof(struct user, u_debugreg[0]);
880 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
882 ret = put_user(tmp, datap);
886 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
888 if ((addr & (sizeof(data) - 1)) || addr < 0 ||
889 addr >= sizeof(struct user))
892 if (addr < sizeof(struct user_regs_struct))
893 ret = putreg(child, addr, data);
894 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
895 addr <= offsetof(struct user, u_debugreg[7])) {
896 addr -= offsetof(struct user, u_debugreg[0]);
897 ret = ptrace_set_debugreg(child,
898 addr / sizeof(data), data);
902 case PTRACE_GETREGS: /* Get all gp regs from the child. */
903 return copy_regset_to_user(child,
904 task_user_regset_view(current),
906 0, sizeof(struct user_regs_struct),
909 case PTRACE_SETREGS: /* Set all gp regs in the child. */
910 return copy_regset_from_user(child,
911 task_user_regset_view(current),
913 0, sizeof(struct user_regs_struct),
916 case PTRACE_GETFPREGS: /* Get the child FPU state. */
917 return copy_regset_to_user(child,
918 task_user_regset_view(current),
920 0, sizeof(struct user_i387_struct),
923 case PTRACE_SETFPREGS: /* Set the child FPU state. */
924 return copy_regset_from_user(child,
925 task_user_regset_view(current),
927 0, sizeof(struct user_i387_struct),
931 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
932 return copy_regset_to_user(child, &user_x86_32_view,
934 0, sizeof(struct user_fxsr_struct),
937 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
938 return copy_regset_from_user(child, &user_x86_32_view,
940 0, sizeof(struct user_fxsr_struct),
944 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
945 case PTRACE_GET_THREAD_AREA:
948 ret = do_get_thread_area(child, addr,
949 (struct user_desc __user *) data);
952 case PTRACE_SET_THREAD_AREA:
955 ret = do_set_thread_area(child, addr,
956 (struct user_desc __user *) data, 0);
961 /* normal 64bit interface to access TLS data.
962 Works just like arch_prctl, except that the arguments
964 case PTRACE_ARCH_PRCTL:
965 ret = do_arch_prctl(child, data, addr);
970 * These bits need more cooking - not enabled yet:
973 case PTRACE_BTS_CONFIG:
974 ret = ptrace_bts_config
975 (child, data, (struct ptrace_bts_config __user *)addr);
978 case PTRACE_BTS_STATUS:
979 ret = ptrace_bts_status
980 (child, data, (struct ptrace_bts_config __user *)addr);
983 case PTRACE_BTS_SIZE:
984 ret = ptrace_bts_get_size(child);
988 ret = ptrace_bts_read_record
989 (child, data, (struct bts_struct __user *) addr);
992 case PTRACE_BTS_CLEAR:
993 ret = ptrace_bts_clear(child);
996 case PTRACE_BTS_DRAIN:
997 ret = ptrace_bts_drain
998 (child, data, (struct bts_struct __user *) addr);
1003 ret = ptrace_request(child, request, addr, data);
1010 #ifdef CONFIG_IA32_EMULATION
1012 #include <linux/compat.h>
1013 #include <linux/syscalls.h>
1014 #include <asm/ia32.h>
1015 #include <asm/user32.h>
1018 case offsetof(struct user32, regs.l): \
1019 regs->q = value; break
1022 case offsetof(struct user32, regs.rs): \
1023 return set_segment_reg(child, \
1024 offsetof(struct user_regs_struct, rs), \
1028 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
1030 struct pt_regs *regs = task_pt_regs(child);
1048 R32(orig_eax, orig_ax);
1052 case offsetof(struct user32, regs.eflags):
1053 return set_flags(child, value);
1055 case offsetof(struct user32, u_debugreg[0]) ...
1056 offsetof(struct user32, u_debugreg[7]):
1057 regno -= offsetof(struct user32, u_debugreg[0]);
1058 return ptrace_set_debugreg(child, regno / 4, value);
1061 if (regno > sizeof(struct user32) || (regno & 3))
1065 * Other dummy fields in the virtual user structure
1077 case offsetof(struct user32, regs.l): \
1078 *val = regs->q; break
1081 case offsetof(struct user32, regs.rs): \
1082 *val = get_segment_reg(child, \
1083 offsetof(struct user_regs_struct, rs)); \
1086 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
1088 struct pt_regs *regs = task_pt_regs(child);
1106 R32(orig_eax, orig_ax);
1110 case offsetof(struct user32, regs.eflags):
1111 *val = get_flags(child);
1114 case offsetof(struct user32, u_debugreg[0]) ...
1115 offsetof(struct user32, u_debugreg[7]):
1116 regno -= offsetof(struct user32, u_debugreg[0]);
1117 *val = ptrace_get_debugreg(child, regno / 4);
1121 if (regno > sizeof(struct user32) || (regno & 3))
1125 * Other dummy fields in the virtual user structure
1137 static int genregs32_get(struct task_struct *target,
1138 const struct user_regset *regset,
1139 unsigned int pos, unsigned int count,
1140 void *kbuf, void __user *ubuf)
1143 compat_ulong_t *k = kbuf;
1145 getreg32(target, pos, k++);
1146 count -= sizeof(*k);
1150 compat_ulong_t __user *u = ubuf;
1152 compat_ulong_t word;
1153 getreg32(target, pos, &word);
1154 if (__put_user(word, u++))
1156 count -= sizeof(*u);
1164 static int genregs32_set(struct task_struct *target,
1165 const struct user_regset *regset,
1166 unsigned int pos, unsigned int count,
1167 const void *kbuf, const void __user *ubuf)
1171 const compat_ulong_t *k = kbuf;
1172 while (count > 0 && !ret) {
1173 ret = putreg32(target, pos, *k++);
1174 count -= sizeof(*k);
1178 const compat_ulong_t __user *u = ubuf;
1179 while (count > 0 && !ret) {
1180 compat_ulong_t word;
1181 ret = __get_user(word, u++);
1184 ret = putreg32(target, pos, word);
1185 count -= sizeof(*u);
1192 static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data)
1194 siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t));
1195 compat_siginfo_t __user *si32 = compat_ptr(data);
1199 if (request == PTRACE_SETSIGINFO) {
1200 memset(&ssi, 0, sizeof(siginfo_t));
1201 ret = copy_siginfo_from_user32(&ssi, si32);
1204 if (copy_to_user(si, &ssi, sizeof(siginfo_t)))
1207 ret = sys_ptrace(request, pid, addr, (unsigned long)si);
1210 if (request == PTRACE_GETSIGINFO) {
1211 if (copy_from_user(&ssi, si, sizeof(siginfo_t)))
1213 ret = copy_siginfo_to_user32(si32, &ssi);
1218 asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
1220 struct task_struct *child;
1221 struct pt_regs *childregs;
1222 void __user *datap = compat_ptr(data);
1227 case PTRACE_TRACEME:
1231 case PTRACE_SINGLESTEP:
1232 case PTRACE_SINGLEBLOCK:
1234 case PTRACE_SYSCALL:
1235 case PTRACE_OLDSETOPTIONS:
1236 case PTRACE_SETOPTIONS:
1237 case PTRACE_SET_THREAD_AREA:
1238 case PTRACE_GET_THREAD_AREA:
1240 case PTRACE_BTS_CONFIG:
1241 case PTRACE_BTS_STATUS:
1242 case PTRACE_BTS_SIZE:
1243 case PTRACE_BTS_GET:
1244 case PTRACE_BTS_CLEAR:
1245 case PTRACE_BTS_DRAIN:
1247 return sys_ptrace(request, pid, addr, data);
1252 case PTRACE_PEEKTEXT:
1253 case PTRACE_PEEKDATA:
1254 case PTRACE_POKEDATA:
1255 case PTRACE_POKETEXT:
1256 case PTRACE_POKEUSR:
1257 case PTRACE_PEEKUSR:
1258 case PTRACE_GETREGS:
1259 case PTRACE_SETREGS:
1260 case PTRACE_SETFPREGS:
1261 case PTRACE_GETFPREGS:
1262 case PTRACE_SETFPXREGS:
1263 case PTRACE_GETFPXREGS:
1264 case PTRACE_GETEVENTMSG:
1267 case PTRACE_SETSIGINFO:
1268 case PTRACE_GETSIGINFO:
1269 return ptrace32_siginfo(request, pid, addr, data);
1272 child = ptrace_get_task_struct(pid);
1274 return PTR_ERR(child);
1276 ret = ptrace_check_attach(child, request == PTRACE_KILL);
1280 childregs = task_pt_regs(child);
1283 case PTRACE_PEEKUSR:
1284 ret = getreg32(child, addr, &val);
1286 ret = put_user(val, (__u32 __user *)datap);
1289 case PTRACE_POKEUSR:
1290 ret = putreg32(child, addr, data);
1293 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1294 return copy_regset_to_user(child, &user_x86_32_view,
1296 0, sizeof(struct user_regs_struct32),
1299 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1300 return copy_regset_from_user(child, &user_x86_32_view,
1302 sizeof(struct user_regs_struct32),
1305 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1306 return copy_regset_to_user(child, &user_x86_32_view,
1308 sizeof(struct user_i387_ia32_struct),
1311 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1312 return copy_regset_from_user(
1313 child, &user_x86_32_view, REGSET_FP,
1314 0, sizeof(struct user_i387_ia32_struct), datap);
1316 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1317 return copy_regset_to_user(child, &user_x86_32_view,
1319 sizeof(struct user32_fxsr_struct),
1322 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1323 return copy_regset_from_user(child, &user_x86_32_view,
1325 sizeof(struct user32_fxsr_struct),
1329 return compat_ptrace_request(child, request, addr, data);
1333 put_task_struct(child);
1337 #endif /* CONFIG_IA32_EMULATION */
1339 #ifdef CONFIG_X86_64
1341 static const struct user_regset x86_64_regsets[] = {
1342 [REGSET_GENERAL] = {
1343 .core_note_type = NT_PRSTATUS,
1344 .n = sizeof(struct user_regs_struct) / sizeof(long),
1345 .size = sizeof(long), .align = sizeof(long),
1346 .get = genregs_get, .set = genregs_set
1349 .core_note_type = NT_PRFPREG,
1350 .n = sizeof(struct user_i387_struct) / sizeof(long),
1351 .size = sizeof(long), .align = sizeof(long),
1352 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1356 static const struct user_regset_view user_x86_64_view = {
1357 .name = "x86_64", .e_machine = EM_X86_64,
1358 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1361 #else /* CONFIG_X86_32 */
1363 #define user_regs_struct32 user_regs_struct
1364 #define genregs32_get genregs_get
1365 #define genregs32_set genregs_set
1367 #endif /* CONFIG_X86_64 */
1369 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1370 static const struct user_regset x86_32_regsets[] = {
1371 [REGSET_GENERAL] = {
1372 .core_note_type = NT_PRSTATUS,
1373 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1374 .size = sizeof(u32), .align = sizeof(u32),
1375 .get = genregs32_get, .set = genregs32_set
1378 .core_note_type = NT_PRFPREG,
1379 .n = sizeof(struct user_i387_struct) / sizeof(u32),
1380 .size = sizeof(u32), .align = sizeof(u32),
1381 .active = fpregs_active, .get = fpregs_get, .set = fpregs_set
1384 .core_note_type = NT_PRXFPREG,
1385 .n = sizeof(struct user_i387_struct) / sizeof(u32),
1386 .size = sizeof(u32), .align = sizeof(u32),
1387 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1390 .core_note_type = NT_386_TLS,
1391 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1392 .size = sizeof(struct user_desc),
1393 .align = sizeof(struct user_desc),
1394 .active = regset_tls_active,
1395 .get = regset_tls_get, .set = regset_tls_set
1399 static const struct user_regset_view user_x86_32_view = {
1400 .name = "i386", .e_machine = EM_386,
1401 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1405 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1407 #ifdef CONFIG_IA32_EMULATION
1408 if (test_tsk_thread_flag(task, TIF_IA32))
1410 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1411 return &user_x86_32_view;
1413 #ifdef CONFIG_X86_64
1414 return &user_x86_64_view;
1418 #ifdef CONFIG_X86_32
1420 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
1422 struct siginfo info;
1424 tsk->thread.trap_no = 1;
1425 tsk->thread.error_code = error_code;
1427 memset(&info, 0, sizeof(info));
1428 info.si_signo = SIGTRAP;
1429 info.si_code = TRAP_BRKPT;
1432 info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL;
1434 /* Send us the fake SIGTRAP */
1435 force_sig_info(SIGTRAP, &info, tsk);
1438 /* notification of system call entry/exit
1439 * - triggered by current->work.syscall_trace
1441 __attribute__((regparm(3)))
1442 int do_syscall_trace(struct pt_regs *regs, int entryexit)
1444 int is_sysemu = test_thread_flag(TIF_SYSCALL_EMU);
1446 * With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP for syscall
1449 int is_singlestep = !is_sysemu && test_thread_flag(TIF_SINGLESTEP);
1452 /* do the secure computing check first */
1454 secure_computing(regs->orig_ax);
1456 if (unlikely(current->audit_context)) {
1458 audit_syscall_exit(AUDITSC_RESULT(regs->ax),
1460 /* Debug traps, when using PTRACE_SINGLESTEP, must be sent only
1461 * on the syscall exit path. Normally, when TIF_SYSCALL_AUDIT is
1462 * not used, entry.S will call us only on syscall exit, not
1463 * entry; so when TIF_SYSCALL_AUDIT is used we must avoid
1464 * calling send_sigtrap() on syscall entry.
1466 * Note that when PTRACE_SYSEMU_SINGLESTEP is used,
1467 * is_singlestep is false, despite his name, so we will still do
1468 * the correct thing.
1470 else if (is_singlestep)
1474 if (!(current->ptrace & PT_PTRACED))
1477 /* If a process stops on the 1st tracepoint with SYSCALL_TRACE
1478 * and then is resumed with SYSEMU_SINGLESTEP, it will come in
1479 * here. We have to check this and return */
1480 if (is_sysemu && entryexit)
1483 /* Fake a debug trap */
1485 send_sigtrap(current, regs, 0);
1487 if (!test_thread_flag(TIF_SYSCALL_TRACE) && !is_sysemu)
1490 /* the 0x80 provides a way for the tracing parent to distinguish
1491 between a syscall stop and SIGTRAP delivery */
1492 /* Note that the debugger could change the result of test_thread_flag!*/
1493 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ? 0x80:0));
1496 * this isn't the same as continuing with a signal, but it will do
1497 * for normal use. strace only continues with a signal if the
1498 * stopping signal is not SIGTRAP. -brl
1500 if (current->exit_code) {
1501 send_sig(current->exit_code, current, 1);
1502 current->exit_code = 0;
1506 if (unlikely(current->audit_context) && !entryexit)
1507 audit_syscall_entry(AUDIT_ARCH_I386, regs->orig_ax,
1508 regs->bx, regs->cx, regs->dx, regs->si);
1512 regs->orig_ax = -1; /* force skip of syscall restarting */
1513 if (unlikely(current->audit_context))
1514 audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
1518 #else /* CONFIG_X86_64 */
1520 static void syscall_trace(struct pt_regs *regs)
1524 printk("trace %s ip %lx sp %lx ax %d origrax %d caller %lx tiflags %x ptrace %x\n",
1526 regs->ip, regs->sp, regs->ax, regs->orig_ax, __builtin_return_address(0),
1527 current_thread_info()->flags, current->ptrace);
1530 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
1533 * this isn't the same as continuing with a signal, but it will do
1534 * for normal use. strace only continues with a signal if the
1535 * stopping signal is not SIGTRAP. -brl
1537 if (current->exit_code) {
1538 send_sig(current->exit_code, current, 1);
1539 current->exit_code = 0;
1543 asmlinkage void syscall_trace_enter(struct pt_regs *regs)
1545 /* do the secure computing check first */
1546 secure_computing(regs->orig_ax);
1548 if (test_thread_flag(TIF_SYSCALL_TRACE)
1549 && (current->ptrace & PT_PTRACED))
1550 syscall_trace(regs);
1552 if (unlikely(current->audit_context)) {
1553 if (test_thread_flag(TIF_IA32)) {
1554 audit_syscall_entry(AUDIT_ARCH_I386,
1557 regs->dx, regs->si);
1559 audit_syscall_entry(AUDIT_ARCH_X86_64,
1562 regs->dx, regs->r10);
1567 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1569 if (unlikely(current->audit_context))
1570 audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
1572 if ((test_thread_flag(TIF_SYSCALL_TRACE)
1573 || test_thread_flag(TIF_SINGLESTEP))
1574 && (current->ptrace & PT_PTRACED))
1575 syscall_trace(regs);
1578 #endif /* CONFIG_X86_32 */