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 unsigned 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);
327 * Orig_ax is really just a flag with small positive and
328 * negative values, so make sure to always sign-extend it
329 * from 32 bits so that it works correctly regardless of
330 * whether we come from a 32-bit environment or not.
332 case offsetof(struct user_regs_struct, orig_ax):
333 value = (long) (s32) value;
336 case offsetof(struct user_regs_struct,fs_base):
337 if (value >= TASK_SIZE_OF(child))
340 * When changing the segment base, use do_arch_prctl
341 * to set either thread.fs or thread.fsindex and the
342 * corresponding GDT slot.
344 if (child->thread.fs != value)
345 return do_arch_prctl(child, ARCH_SET_FS, value);
347 case offsetof(struct user_regs_struct,gs_base):
349 * Exactly the same here as the %fs handling above.
351 if (value >= TASK_SIZE_OF(child))
353 if (child->thread.gs != value)
354 return do_arch_prctl(child, ARCH_SET_GS, value);
359 *pt_regs_access(task_pt_regs(child), offset) = value;
363 static unsigned long getreg(struct task_struct *task, unsigned long offset)
366 case offsetof(struct user_regs_struct, cs):
367 case offsetof(struct user_regs_struct, ds):
368 case offsetof(struct user_regs_struct, es):
369 case offsetof(struct user_regs_struct, fs):
370 case offsetof(struct user_regs_struct, gs):
371 case offsetof(struct user_regs_struct, ss):
372 return get_segment_reg(task, offset);
374 case offsetof(struct user_regs_struct, flags):
375 return get_flags(task);
378 case offsetof(struct user_regs_struct, fs_base): {
380 * do_arch_prctl may have used a GDT slot instead of
381 * the MSR. To userland, it appears the same either
382 * way, except the %fs segment selector might not be 0.
384 unsigned int seg = task->thread.fsindex;
385 if (task->thread.fs != 0)
386 return task->thread.fs;
388 asm("movl %%fs,%0" : "=r" (seg));
389 if (seg != FS_TLS_SEL)
391 return get_desc_base(&task->thread.tls_array[FS_TLS]);
393 case offsetof(struct user_regs_struct, gs_base): {
395 * Exactly the same here as the %fs handling above.
397 unsigned int seg = task->thread.gsindex;
398 if (task->thread.gs != 0)
399 return task->thread.gs;
401 asm("movl %%gs,%0" : "=r" (seg));
402 if (seg != GS_TLS_SEL)
404 return get_desc_base(&task->thread.tls_array[GS_TLS]);
409 return *pt_regs_access(task_pt_regs(task), offset);
412 static int genregs_get(struct task_struct *target,
413 const struct user_regset *regset,
414 unsigned int pos, unsigned int count,
415 void *kbuf, void __user *ubuf)
418 unsigned long *k = kbuf;
420 *k++ = getreg(target, pos);
425 unsigned long __user *u = ubuf;
427 if (__put_user(getreg(target, pos), u++))
437 static int genregs_set(struct task_struct *target,
438 const struct user_regset *regset,
439 unsigned int pos, unsigned int count,
440 const void *kbuf, const void __user *ubuf)
444 const unsigned long *k = kbuf;
445 while (count > 0 && !ret) {
446 ret = putreg(target, pos, *k++);
451 const unsigned long __user *u = ubuf;
452 while (count > 0 && !ret) {
454 ret = __get_user(word, u++);
457 ret = putreg(target, pos, word);
466 * This function is trivial and will be inlined by the compiler.
467 * Having it separates the implementation details of debug
468 * registers from the interface details of ptrace.
470 static unsigned long ptrace_get_debugreg(struct task_struct *child, int n)
473 case 0: return child->thread.debugreg0;
474 case 1: return child->thread.debugreg1;
475 case 2: return child->thread.debugreg2;
476 case 3: return child->thread.debugreg3;
477 case 6: return child->thread.debugreg6;
478 case 7: return child->thread.debugreg7;
483 static int ptrace_set_debugreg(struct task_struct *child,
484 int n, unsigned long data)
488 if (unlikely(n == 4 || n == 5))
491 if (n < 4 && unlikely(data >= debugreg_addr_limit(child)))
495 case 0: child->thread.debugreg0 = data; break;
496 case 1: child->thread.debugreg1 = data; break;
497 case 2: child->thread.debugreg2 = data; break;
498 case 3: child->thread.debugreg3 = data; break;
501 if ((data & ~0xffffffffUL) != 0)
503 child->thread.debugreg6 = data;
508 * Sanity-check data. Take one half-byte at once with
509 * check = (val >> (16 + 4*i)) & 0xf. It contains the
510 * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits
511 * 2 and 3 are LENi. Given a list of invalid values,
512 * we do mask |= 1 << invalid_value, so that
513 * (mask >> check) & 1 is a correct test for invalid
516 * R/Wi contains the type of the breakpoint /
517 * watchpoint, LENi contains the length of the watched
518 * data in the watchpoint case.
520 * The invalid values are:
521 * - LENi == 0x10 (undefined), so mask |= 0x0f00. [32-bit]
522 * - R/Wi == 0x10 (break on I/O reads or writes), so
524 * - R/Wi == 0x00 && LENi != 0x00, so we have mask |=
527 * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54.
529 * See the Intel Manual "System Programming Guide",
532 * Note that LENi == 0x10 is defined on x86_64 in long
533 * mode (i.e. even for 32-bit userspace software, but
534 * 64-bit kernel), so the x86_64 mask value is 0x5454.
535 * See the AMD manual no. 24593 (AMD64 System Programming)
538 #define DR7_MASK 0x5f54
540 #define DR7_MASK 0x5554
542 data &= ~DR_CONTROL_RESERVED;
543 for (i = 0; i < 4; i++)
544 if ((DR7_MASK >> ((data >> (16 + 4*i)) & 0xf)) & 1)
546 child->thread.debugreg7 = data;
548 set_tsk_thread_flag(child, TIF_DEBUG);
550 clear_tsk_thread_flag(child, TIF_DEBUG);
557 #ifdef CONFIG_X86_PTRACE_BTS
559 * The configuration for a particular BTS hardware implementation.
561 struct bts_configuration {
562 /* the size of a BTS record in bytes; at most BTS_MAX_RECORD_SIZE */
563 unsigned char sizeof_bts;
564 /* the size of a field in the BTS record in bytes */
565 unsigned char sizeof_field;
566 /* a bitmask to enable/disable BTS in DEBUGCTL MSR */
567 unsigned long debugctl_mask;
569 static struct bts_configuration bts_cfg;
571 #define BTS_MAX_RECORD_SIZE (8 * 3)
575 * Branch Trace Store (BTS) uses the following format. Different
576 * architectures vary in the size of those fields.
577 * - source linear address
578 * - destination linear address
581 * Later architectures use 64bit pointers throughout, whereas earlier
582 * architectures use 32bit pointers in 32bit mode.
584 * We compute the base address for the first 8 fields based on:
585 * - the field size stored in the DS configuration
586 * - the relative field position
588 * In order to store additional information in the BTS buffer, we use
589 * a special source address to indicate that the record requires
590 * special interpretation.
592 * Netburst indicated via a bit in the flags field whether the branch
593 * was predicted; this is ignored.
601 bts_escape = (unsigned long)-1,
603 bts_jiffies = bts_flags
606 static inline unsigned long bts_get(const char *base, enum bts_field field)
608 base += (bts_cfg.sizeof_field * field);
609 return *(unsigned long *)base;
612 static inline void bts_set(char *base, enum bts_field field, unsigned long val)
614 base += (bts_cfg.sizeof_field * field);;
615 (*(unsigned long *)base) = val;
619 * Translate a BTS record from the raw format into the bts_struct format
621 * out (out): bts_struct interpretation
622 * raw: raw BTS record
624 static void ptrace_bts_translate_record(struct bts_struct *out, const void *raw)
626 memset(out, 0, sizeof(*out));
627 if (bts_get(raw, bts_from) == bts_escape) {
628 out->qualifier = bts_get(raw, bts_qual);
629 out->variant.jiffies = bts_get(raw, bts_jiffies);
631 out->qualifier = BTS_BRANCH;
632 out->variant.lbr.from_ip = bts_get(raw, bts_from);
633 out->variant.lbr.to_ip = bts_get(raw, bts_to);
637 static int ptrace_bts_read_record(struct task_struct *child, size_t index,
638 struct bts_struct __user *out)
640 struct bts_struct ret;
641 const void *bts_record;
642 size_t bts_index, bts_end;
645 error = ds_get_bts_end(child, &bts_end);
649 if (bts_end <= index)
652 error = ds_get_bts_index(child, &bts_index);
656 /* translate the ptrace bts index into the ds bts index */
657 bts_index += bts_end - (index + 1);
658 if (bts_end <= bts_index)
659 bts_index -= bts_end;
661 error = ds_access_bts(child, bts_index, &bts_record);
665 ptrace_bts_translate_record(&ret, bts_record);
667 if (copy_to_user(out, &ret, sizeof(ret)))
673 static int ptrace_bts_drain(struct task_struct *child,
675 struct bts_struct __user *out)
677 struct bts_struct ret;
678 const unsigned char *raw;
682 error = ds_get_bts_index(child, &end);
686 if (size < (end * sizeof(struct bts_struct)))
689 error = ds_access_bts(child, 0, (const void **)&raw);
693 for (i = 0; i < end; i++, out++, raw += bts_cfg.sizeof_bts) {
694 ptrace_bts_translate_record(&ret, raw);
696 if (copy_to_user(out, &ret, sizeof(ret)))
700 error = ds_clear_bts(child);
707 static void ptrace_bts_ovfl(struct task_struct *child)
709 send_sig(child->thread.bts_ovfl_signal, child, 0);
712 static int ptrace_bts_config(struct task_struct *child,
714 const struct ptrace_bts_config __user *ucfg)
716 struct ptrace_bts_config cfg;
720 if (!bts_cfg.sizeof_bts)
724 if (cfg_size < sizeof(cfg))
728 if (copy_from_user(&cfg, ucfg, sizeof(cfg)))
732 if ((cfg.flags & PTRACE_BTS_O_SIGNAL) &&
733 !(cfg.flags & PTRACE_BTS_O_ALLOC))
736 if (cfg.flags & PTRACE_BTS_O_ALLOC) {
737 ds_ovfl_callback_t ovfl = 0;
738 unsigned int sig = 0;
740 /* we ignore the error in case we were not tracing child */
741 (void)ds_release_bts(child);
743 if (cfg.flags & PTRACE_BTS_O_SIGNAL) {
748 ovfl = ptrace_bts_ovfl;
751 error = ds_request_bts(child, /* base = */ 0, cfg.size, ovfl);
755 child->thread.bts_ovfl_signal = sig;
759 if (!child->thread.ds_ctx && cfg.flags)
762 if (cfg.flags & PTRACE_BTS_O_TRACE)
763 child->thread.debugctlmsr |= bts_cfg.debugctl_mask;
765 child->thread.debugctlmsr &= ~bts_cfg.debugctl_mask;
767 if (cfg.flags & PTRACE_BTS_O_SCHED)
768 set_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
770 clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
775 if (child->thread.debugctlmsr)
776 set_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
778 clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
783 child->thread.debugctlmsr &= ~bts_cfg.debugctl_mask;
784 clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
788 static int ptrace_bts_status(struct task_struct *child,
790 struct ptrace_bts_config __user *ucfg)
792 struct ptrace_bts_config cfg;
794 const void *base, *max;
797 if (cfg_size < sizeof(cfg))
800 error = ds_get_bts_end(child, &end);
804 error = ds_access_bts(child, /* index = */ 0, &base);
808 error = ds_access_bts(child, /* index = */ end, &max);
812 memset(&cfg, 0, sizeof(cfg));
813 cfg.size = (max - base);
814 cfg.signal = child->thread.bts_ovfl_signal;
815 cfg.bts_size = sizeof(struct bts_struct);
818 cfg.flags |= PTRACE_BTS_O_SIGNAL;
820 if (test_tsk_thread_flag(child, TIF_DEBUGCTLMSR) &&
821 child->thread.debugctlmsr & bts_cfg.debugctl_mask)
822 cfg.flags |= PTRACE_BTS_O_TRACE;
824 if (test_tsk_thread_flag(child, TIF_BTS_TRACE_TS))
825 cfg.flags |= PTRACE_BTS_O_SCHED;
827 if (copy_to_user(ucfg, &cfg, sizeof(cfg)))
833 static int ptrace_bts_write_record(struct task_struct *child,
834 const struct bts_struct *in)
836 unsigned char bts_record[BTS_MAX_RECORD_SIZE];
838 BUG_ON(BTS_MAX_RECORD_SIZE < bts_cfg.sizeof_bts);
840 memset(bts_record, 0, bts_cfg.sizeof_bts);
841 switch (in->qualifier) {
846 bts_set(bts_record, bts_from, in->variant.lbr.from_ip);
847 bts_set(bts_record, bts_to, in->variant.lbr.to_ip);
850 case BTS_TASK_ARRIVES:
851 case BTS_TASK_DEPARTS:
852 bts_set(bts_record, bts_from, bts_escape);
853 bts_set(bts_record, bts_qual, in->qualifier);
854 bts_set(bts_record, bts_jiffies, in->variant.jiffies);
861 /* The writing task will be the switched-to task on a context
862 * switch. It needs to write into the switched-from task's BTS
864 return ds_unchecked_write_bts(child, bts_record, bts_cfg.sizeof_bts);
867 void ptrace_bts_take_timestamp(struct task_struct *tsk,
868 enum bts_qualifier qualifier)
870 struct bts_struct rec = {
871 .qualifier = qualifier,
872 .variant.jiffies = jiffies_64
875 ptrace_bts_write_record(tsk, &rec);
878 static const struct bts_configuration bts_cfg_netburst = {
879 .sizeof_bts = sizeof(long) * 3,
880 .sizeof_field = sizeof(long),
881 .debugctl_mask = (1<<2)|(1<<3)|(1<<5)
884 static const struct bts_configuration bts_cfg_pentium_m = {
885 .sizeof_bts = sizeof(long) * 3,
886 .sizeof_field = sizeof(long),
887 .debugctl_mask = (1<<6)|(1<<7)
890 static const struct bts_configuration bts_cfg_core2 = {
893 .debugctl_mask = (1<<6)|(1<<7)|(1<<9)
896 static inline void bts_configure(const struct bts_configuration *cfg)
901 void __cpuinit ptrace_bts_init_intel(struct cpuinfo_x86 *c)
905 switch (c->x86_model) {
907 case 0xE: /* Pentium M */
908 bts_configure(&bts_cfg_pentium_m);
910 case 0xF: /* Core2 */
911 case 0x1C: /* Atom */
912 bts_configure(&bts_cfg_core2);
915 /* sorry, don't know about them */
920 switch (c->x86_model) {
923 case 0x2: /* Netburst */
924 bts_configure(&bts_cfg_netburst);
927 /* sorry, don't know about them */
932 /* sorry, don't know about them */
936 #endif /* CONFIG_X86_PTRACE_BTS */
939 * Called by kernel/ptrace.c when detaching..
941 * Make sure the single step bit is not set.
943 void ptrace_disable(struct task_struct *child)
945 user_disable_single_step(child);
946 #ifdef TIF_SYSCALL_EMU
947 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
949 #ifdef CONFIG_X86_PTRACE_BTS
950 (void)ds_release_bts(child);
952 child->thread.debugctlmsr &= ~bts_cfg.debugctl_mask;
953 if (!child->thread.debugctlmsr)
954 clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
956 clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
957 #endif /* CONFIG_X86_PTRACE_BTS */
960 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
961 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
964 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
967 unsigned long __user *datap = (unsigned long __user *)data;
970 /* read the word at location addr in the USER area. */
971 case PTRACE_PEEKUSR: {
975 if ((addr & (sizeof(data) - 1)) || addr < 0 ||
976 addr >= sizeof(struct user))
979 tmp = 0; /* Default return condition */
980 if (addr < sizeof(struct user_regs_struct))
981 tmp = getreg(child, addr);
982 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
983 addr <= offsetof(struct user, u_debugreg[7])) {
984 addr -= offsetof(struct user, u_debugreg[0]);
985 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
987 ret = put_user(tmp, datap);
991 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
993 if ((addr & (sizeof(data) - 1)) || addr < 0 ||
994 addr >= sizeof(struct user))
997 if (addr < sizeof(struct user_regs_struct))
998 ret = putreg(child, addr, data);
999 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1000 addr <= offsetof(struct user, u_debugreg[7])) {
1001 addr -= offsetof(struct user, u_debugreg[0]);
1002 ret = ptrace_set_debugreg(child,
1003 addr / sizeof(data), data);
1007 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1008 return copy_regset_to_user(child,
1009 task_user_regset_view(current),
1011 0, sizeof(struct user_regs_struct),
1014 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1015 return copy_regset_from_user(child,
1016 task_user_regset_view(current),
1018 0, sizeof(struct user_regs_struct),
1021 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1022 return copy_regset_to_user(child,
1023 task_user_regset_view(current),
1025 0, sizeof(struct user_i387_struct),
1028 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1029 return copy_regset_from_user(child,
1030 task_user_regset_view(current),
1032 0, sizeof(struct user_i387_struct),
1035 #ifdef CONFIG_X86_32
1036 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1037 return copy_regset_to_user(child, &user_x86_32_view,
1039 0, sizeof(struct user_fxsr_struct),
1042 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1043 return copy_regset_from_user(child, &user_x86_32_view,
1045 0, sizeof(struct user_fxsr_struct),
1049 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1050 case PTRACE_GET_THREAD_AREA:
1053 ret = do_get_thread_area(child, addr,
1054 (struct user_desc __user *) data);
1057 case PTRACE_SET_THREAD_AREA:
1060 ret = do_set_thread_area(child, addr,
1061 (struct user_desc __user *) data, 0);
1065 #ifdef CONFIG_X86_64
1066 /* normal 64bit interface to access TLS data.
1067 Works just like arch_prctl, except that the arguments
1069 case PTRACE_ARCH_PRCTL:
1070 ret = do_arch_prctl(child, data, addr);
1075 * These bits need more cooking - not enabled yet:
1077 #ifdef CONFIG_X86_PTRACE_BTS
1078 case PTRACE_BTS_CONFIG:
1079 ret = ptrace_bts_config
1080 (child, data, (struct ptrace_bts_config __user *)addr);
1083 case PTRACE_BTS_STATUS:
1084 ret = ptrace_bts_status
1085 (child, data, (struct ptrace_bts_config __user *)addr);
1088 case PTRACE_BTS_SIZE:
1089 ret = ds_get_bts_index(child, /* pos = */ 0);
1092 case PTRACE_BTS_GET:
1093 ret = ptrace_bts_read_record
1094 (child, data, (struct bts_struct __user *) addr);
1097 case PTRACE_BTS_CLEAR:
1098 ret = ds_clear_bts(child);
1101 case PTRACE_BTS_DRAIN:
1102 ret = ptrace_bts_drain
1103 (child, data, (struct bts_struct __user *) addr);
1105 #endif /* CONFIG_X86_PTRACE_BTS */
1108 ret = ptrace_request(child, request, addr, data);
1115 #ifdef CONFIG_IA32_EMULATION
1117 #include <linux/compat.h>
1118 #include <linux/syscalls.h>
1119 #include <asm/ia32.h>
1120 #include <asm/user32.h>
1123 case offsetof(struct user32, regs.l): \
1124 regs->q = value; break
1127 case offsetof(struct user32, regs.rs): \
1128 return set_segment_reg(child, \
1129 offsetof(struct user_regs_struct, rs), \
1133 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
1135 struct pt_regs *regs = task_pt_regs(child);
1156 case offsetof(struct user32, regs.orig_eax):
1158 * Sign-extend the value so that orig_eax = -1
1159 * causes (long)orig_ax < 0 tests to fire correctly.
1161 regs->orig_ax = (long) (s32) value;
1164 case offsetof(struct user32, regs.eflags):
1165 return set_flags(child, value);
1167 case offsetof(struct user32, u_debugreg[0]) ...
1168 offsetof(struct user32, u_debugreg[7]):
1169 regno -= offsetof(struct user32, u_debugreg[0]);
1170 return ptrace_set_debugreg(child, regno / 4, value);
1173 if (regno > sizeof(struct user32) || (regno & 3))
1177 * Other dummy fields in the virtual user structure
1189 case offsetof(struct user32, regs.l): \
1190 *val = regs->q; break
1193 case offsetof(struct user32, regs.rs): \
1194 *val = get_segment_reg(child, \
1195 offsetof(struct user_regs_struct, rs)); \
1198 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
1200 struct pt_regs *regs = task_pt_regs(child);
1218 R32(orig_eax, orig_ax);
1222 case offsetof(struct user32, regs.eflags):
1223 *val = get_flags(child);
1226 case offsetof(struct user32, u_debugreg[0]) ...
1227 offsetof(struct user32, u_debugreg[7]):
1228 regno -= offsetof(struct user32, u_debugreg[0]);
1229 *val = ptrace_get_debugreg(child, regno / 4);
1233 if (regno > sizeof(struct user32) || (regno & 3))
1237 * Other dummy fields in the virtual user structure
1249 static int genregs32_get(struct task_struct *target,
1250 const struct user_regset *regset,
1251 unsigned int pos, unsigned int count,
1252 void *kbuf, void __user *ubuf)
1255 compat_ulong_t *k = kbuf;
1257 getreg32(target, pos, k++);
1258 count -= sizeof(*k);
1262 compat_ulong_t __user *u = ubuf;
1264 compat_ulong_t word;
1265 getreg32(target, pos, &word);
1266 if (__put_user(word, u++))
1268 count -= sizeof(*u);
1276 static int genregs32_set(struct task_struct *target,
1277 const struct user_regset *regset,
1278 unsigned int pos, unsigned int count,
1279 const void *kbuf, const void __user *ubuf)
1283 const compat_ulong_t *k = kbuf;
1284 while (count > 0 && !ret) {
1285 ret = putreg32(target, pos, *k++);
1286 count -= sizeof(*k);
1290 const compat_ulong_t __user *u = ubuf;
1291 while (count > 0 && !ret) {
1292 compat_ulong_t word;
1293 ret = __get_user(word, u++);
1296 ret = putreg32(target, pos, word);
1297 count -= sizeof(*u);
1304 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1305 compat_ulong_t caddr, compat_ulong_t cdata)
1307 unsigned long addr = caddr;
1308 unsigned long data = cdata;
1309 void __user *datap = compat_ptr(data);
1314 case PTRACE_PEEKUSR:
1315 ret = getreg32(child, addr, &val);
1317 ret = put_user(val, (__u32 __user *)datap);
1320 case PTRACE_POKEUSR:
1321 ret = putreg32(child, addr, data);
1324 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1325 return copy_regset_to_user(child, &user_x86_32_view,
1327 0, sizeof(struct user_regs_struct32),
1330 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1331 return copy_regset_from_user(child, &user_x86_32_view,
1333 sizeof(struct user_regs_struct32),
1336 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1337 return copy_regset_to_user(child, &user_x86_32_view,
1339 sizeof(struct user_i387_ia32_struct),
1342 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1343 return copy_regset_from_user(
1344 child, &user_x86_32_view, REGSET_FP,
1345 0, sizeof(struct user_i387_ia32_struct), datap);
1347 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1348 return copy_regset_to_user(child, &user_x86_32_view,
1350 sizeof(struct user32_fxsr_struct),
1353 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1354 return copy_regset_from_user(child, &user_x86_32_view,
1356 sizeof(struct user32_fxsr_struct),
1359 case PTRACE_GET_THREAD_AREA:
1360 case PTRACE_SET_THREAD_AREA:
1361 return arch_ptrace(child, request, addr, data);
1364 return compat_ptrace_request(child, request, addr, data);
1370 #endif /* CONFIG_IA32_EMULATION */
1372 #ifdef CONFIG_X86_64
1374 static const struct user_regset x86_64_regsets[] = {
1375 [REGSET_GENERAL] = {
1376 .core_note_type = NT_PRSTATUS,
1377 .n = sizeof(struct user_regs_struct) / sizeof(long),
1378 .size = sizeof(long), .align = sizeof(long),
1379 .get = genregs_get, .set = genregs_set
1382 .core_note_type = NT_PRFPREG,
1383 .n = sizeof(struct user_i387_struct) / sizeof(long),
1384 .size = sizeof(long), .align = sizeof(long),
1385 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1389 static const struct user_regset_view user_x86_64_view = {
1390 .name = "x86_64", .e_machine = EM_X86_64,
1391 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1394 #else /* CONFIG_X86_32 */
1396 #define user_regs_struct32 user_regs_struct
1397 #define genregs32_get genregs_get
1398 #define genregs32_set genregs_set
1400 #define user_i387_ia32_struct user_i387_struct
1401 #define user32_fxsr_struct user_fxsr_struct
1403 #endif /* CONFIG_X86_64 */
1405 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1406 static const struct user_regset x86_32_regsets[] = {
1407 [REGSET_GENERAL] = {
1408 .core_note_type = NT_PRSTATUS,
1409 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1410 .size = sizeof(u32), .align = sizeof(u32),
1411 .get = genregs32_get, .set = genregs32_set
1414 .core_note_type = NT_PRFPREG,
1415 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1416 .size = sizeof(u32), .align = sizeof(u32),
1417 .active = fpregs_active, .get = fpregs_get, .set = fpregs_set
1420 .core_note_type = NT_PRXFPREG,
1421 .n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
1422 .size = sizeof(u32), .align = sizeof(u32),
1423 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1426 .core_note_type = NT_386_TLS,
1427 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1428 .size = sizeof(struct user_desc),
1429 .align = sizeof(struct user_desc),
1430 .active = regset_tls_active,
1431 .get = regset_tls_get, .set = regset_tls_set
1435 static const struct user_regset_view user_x86_32_view = {
1436 .name = "i386", .e_machine = EM_386,
1437 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1441 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1443 #ifdef CONFIG_IA32_EMULATION
1444 if (test_tsk_thread_flag(task, TIF_IA32))
1446 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1447 return &user_x86_32_view;
1449 #ifdef CONFIG_X86_64
1450 return &user_x86_64_view;
1454 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
1456 struct siginfo info;
1458 tsk->thread.trap_no = 1;
1459 tsk->thread.error_code = error_code;
1461 memset(&info, 0, sizeof(info));
1462 info.si_signo = SIGTRAP;
1463 info.si_code = TRAP_BRKPT;
1466 info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL;
1468 /* Send us the fake SIGTRAP */
1469 force_sig_info(SIGTRAP, &info, tsk);
1472 static void syscall_trace(struct pt_regs *regs)
1474 if (!(current->ptrace & PT_PTRACED))
1478 printk("trace %s ip %lx sp %lx ax %d origrax %d caller %lx tiflags %x ptrace %x\n",
1480 regs->ip, regs->sp, regs->ax, regs->orig_ax, __builtin_return_address(0),
1481 current_thread_info()->flags, current->ptrace);
1484 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
1487 * this isn't the same as continuing with a signal, but it will do
1488 * for normal use. strace only continues with a signal if the
1489 * stopping signal is not SIGTRAP. -brl
1491 if (current->exit_code) {
1492 send_sig(current->exit_code, current, 1);
1493 current->exit_code = 0;
1497 #ifdef CONFIG_X86_32
1499 #elif defined CONFIG_IA32_EMULATION
1500 # define IS_IA32 test_thread_flag(TIF_IA32)
1506 * We must return the syscall number to actually look up in the table.
1507 * This can be -1L to skip running any syscall at all.
1509 asmregparm long syscall_trace_enter(struct pt_regs *regs)
1514 * If we stepped into a sysenter/syscall insn, it trapped in
1515 * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP.
1516 * If user-mode had set TF itself, then it's still clear from
1517 * do_debug() and we need to set it again to restore the user
1518 * state. If we entered on the slow path, TF was already set.
1520 if (test_thread_flag(TIF_SINGLESTEP))
1521 regs->flags |= X86_EFLAGS_TF;
1523 /* do the secure computing check first */
1524 secure_computing(regs->orig_ax);
1526 if (unlikely(test_thread_flag(TIF_SYSCALL_EMU)))
1529 if (ret || test_thread_flag(TIF_SYSCALL_TRACE))
1530 syscall_trace(regs);
1532 if (unlikely(current->audit_context)) {
1534 audit_syscall_entry(AUDIT_ARCH_I386,
1537 regs->dx, regs->si);
1538 #ifdef CONFIG_X86_64
1540 audit_syscall_entry(AUDIT_ARCH_X86_64,
1543 regs->dx, regs->r10);
1547 return ret ?: regs->orig_ax;
1550 asmregparm void syscall_trace_leave(struct pt_regs *regs)
1552 if (unlikely(current->audit_context))
1553 audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
1555 if (test_thread_flag(TIF_SYSCALL_TRACE))
1556 syscall_trace(regs);
1559 * If TIF_SYSCALL_EMU is set, we only get here because of
1560 * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP).
1561 * We already reported this syscall instruction in
1562 * syscall_trace_enter(), so don't do any more now.
1564 if (unlikely(test_thread_flag(TIF_SYSCALL_EMU)))
1568 * If we are single-stepping, synthesize a trap to follow the
1569 * system call instruction.
1571 if (test_thread_flag(TIF_SINGLESTEP) &&
1572 (current->ptrace & PT_PTRACED))
1573 send_sigtrap(current, regs, 0);