2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1992 Ross Biro
7 * Copyright (C) Linus Torvalds
8 * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
9 * Copyright (C) 1996 David S. Miller
10 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
11 * Copyright (C) 1999 MIPS Technologies, Inc.
12 * Copyright (C) 2000 Ulf Carlsson
14 * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
17 #include <linux/compiler.h>
18 #include <linux/context_tracking.h>
19 #include <linux/elf.h>
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
22 #include <linux/sched/task_stack.h>
24 #include <linux/errno.h>
25 #include <linux/ptrace.h>
26 #include <linux/regset.h>
27 #include <linux/smp.h>
28 #include <linux/security.h>
29 #include <linux/stddef.h>
30 #include <linux/tracehook.h>
31 #include <linux/audit.h>
32 #include <linux/seccomp.h>
33 #include <linux/ftrace.h>
35 #include <asm/byteorder.h>
37 #include <asm/cpu-info.h>
40 #include <asm/mipsregs.h>
41 #include <asm/mipsmtregs.h>
42 #include <asm/pgtable.h>
44 #include <asm/syscall.h>
45 #include <linux/uaccess.h>
46 #include <asm/bootinfo.h>
49 #define CREATE_TRACE_POINTS
50 #include <trace/events/syscalls.h>
52 static void init_fp_ctx(struct task_struct *target)
54 /* If FP has been used then the target already has context */
55 if (tsk_used_math(target))
58 /* Begin with data registers set to all 1s... */
59 memset(&target->thread.fpu.fpr, ~0, sizeof(target->thread.fpu.fpr));
61 /* FCSR has been preset by `mips_set_personality_nan'. */
64 * Record that the target has "used" math, such that the context
65 * just initialised, and any modifications made by the caller,
68 set_stopped_child_used_math(target);
72 * Called by kernel/ptrace.c when detaching..
74 * Make sure single step bits etc are not set.
76 void ptrace_disable(struct task_struct *child)
78 /* Don't load the watchpoint registers for the ex-child. */
79 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
83 * Poke at FCSR according to its mask. Set the Cause bits even
84 * if a corresponding Enable bit is set. This will be noticed at
85 * the time the thread is switched to and SIGFPE thrown accordingly.
87 static void ptrace_setfcr31(struct task_struct *child, u32 value)
92 fcr31 = child->thread.fpu.fcr31;
93 mask = boot_cpu_data.fpu_msk31;
94 child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask);
98 * Read a general register set. We always use the 64-bit format, even
99 * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
100 * Registers are sign extended to fill the available space.
102 int ptrace_getregs(struct task_struct *child, struct user_pt_regs __user *data)
104 struct pt_regs *regs;
107 if (!access_ok(VERIFY_WRITE, data, 38 * 8))
110 regs = task_pt_regs(child);
112 for (i = 0; i < 32; i++)
113 __put_user((long)regs->regs[i], (__s64 __user *)&data->regs[i]);
114 __put_user((long)regs->lo, (__s64 __user *)&data->lo);
115 __put_user((long)regs->hi, (__s64 __user *)&data->hi);
116 __put_user((long)regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
117 __put_user((long)regs->cp0_badvaddr, (__s64 __user *)&data->cp0_badvaddr);
118 __put_user((long)regs->cp0_status, (__s64 __user *)&data->cp0_status);
119 __put_user((long)regs->cp0_cause, (__s64 __user *)&data->cp0_cause);
125 * Write a general register set. As for PTRACE_GETREGS, we always use
126 * the 64-bit format. On a 32-bit kernel only the lower order half
127 * (according to endianness) will be used.
129 int ptrace_setregs(struct task_struct *child, struct user_pt_regs __user *data)
131 struct pt_regs *regs;
134 if (!access_ok(VERIFY_READ, data, 38 * 8))
137 regs = task_pt_regs(child);
139 for (i = 0; i < 32; i++)
140 __get_user(regs->regs[i], (__s64 __user *)&data->regs[i]);
141 __get_user(regs->lo, (__s64 __user *)&data->lo);
142 __get_user(regs->hi, (__s64 __user *)&data->hi);
143 __get_user(regs->cp0_epc, (__s64 __user *)&data->cp0_epc);
145 /* badvaddr, status, and cause may not be written. */
147 /* System call number may have been changed */
148 mips_syscall_update_nr(child, regs);
153 int ptrace_getfpregs(struct task_struct *child, __u32 __user *data)
157 if (!access_ok(VERIFY_WRITE, data, 33 * 8))
160 if (tsk_used_math(child)) {
161 union fpureg *fregs = get_fpu_regs(child);
162 for (i = 0; i < 32; i++)
163 __put_user(get_fpr64(&fregs[i], 0),
164 i + (__u64 __user *)data);
166 for (i = 0; i < 32; i++)
167 __put_user((__u64) -1, i + (__u64 __user *) data);
170 __put_user(child->thread.fpu.fcr31, data + 64);
171 __put_user(boot_cpu_data.fpu_id, data + 65);
176 int ptrace_setfpregs(struct task_struct *child, __u32 __user *data)
183 if (!access_ok(VERIFY_READ, data, 33 * 8))
187 fregs = get_fpu_regs(child);
189 for (i = 0; i < 32; i++) {
190 __get_user(fpr_val, i + (__u64 __user *)data);
191 set_fpr64(&fregs[i], 0, fpr_val);
194 __get_user(value, data + 64);
195 ptrace_setfcr31(child, value);
197 /* FIR may not be written. */
202 int ptrace_get_watch_regs(struct task_struct *child,
203 struct pt_watch_regs __user *addr)
205 enum pt_watch_style style;
208 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
210 if (!access_ok(VERIFY_WRITE, addr, sizeof(struct pt_watch_regs)))
214 style = pt_watch_style_mips32;
215 #define WATCH_STYLE mips32
217 style = pt_watch_style_mips64;
218 #define WATCH_STYLE mips64
221 __put_user(style, &addr->style);
222 __put_user(boot_cpu_data.watch_reg_use_cnt,
223 &addr->WATCH_STYLE.num_valid);
224 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
225 __put_user(child->thread.watch.mips3264.watchlo[i],
226 &addr->WATCH_STYLE.watchlo[i]);
227 __put_user(child->thread.watch.mips3264.watchhi[i] &
228 (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW),
229 &addr->WATCH_STYLE.watchhi[i]);
230 __put_user(boot_cpu_data.watch_reg_masks[i],
231 &addr->WATCH_STYLE.watch_masks[i]);
234 __put_user(0, &addr->WATCH_STYLE.watchlo[i]);
235 __put_user(0, &addr->WATCH_STYLE.watchhi[i]);
236 __put_user(0, &addr->WATCH_STYLE.watch_masks[i]);
242 int ptrace_set_watch_regs(struct task_struct *child,
243 struct pt_watch_regs __user *addr)
246 int watch_active = 0;
247 unsigned long lt[NUM_WATCH_REGS];
248 u16 ht[NUM_WATCH_REGS];
250 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
252 if (!access_ok(VERIFY_READ, addr, sizeof(struct pt_watch_regs)))
254 /* Check the values. */
255 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
256 __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]);
258 if (lt[i] & __UA_LIMIT)
261 if (test_tsk_thread_flag(child, TIF_32BIT_ADDR)) {
262 if (lt[i] & 0xffffffff80000000UL)
265 if (lt[i] & __UA_LIMIT)
269 __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]);
270 if (ht[i] & ~MIPS_WATCHHI_MASK)
274 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
275 if (lt[i] & MIPS_WATCHLO_IRW)
277 child->thread.watch.mips3264.watchlo[i] = lt[i];
279 child->thread.watch.mips3264.watchhi[i] = ht[i];
283 set_tsk_thread_flag(child, TIF_LOAD_WATCH);
285 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
290 /* regset get/set implementations */
292 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
294 static int gpr32_get(struct task_struct *target,
295 const struct user_regset *regset,
296 unsigned int pos, unsigned int count,
297 void *kbuf, void __user *ubuf)
299 struct pt_regs *regs = task_pt_regs(target);
300 u32 uregs[ELF_NGREG] = {};
302 mips_dump_regs32(uregs, regs);
303 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
307 static int gpr32_set(struct task_struct *target,
308 const struct user_regset *regset,
309 unsigned int pos, unsigned int count,
310 const void *kbuf, const void __user *ubuf)
312 struct pt_regs *regs = task_pt_regs(target);
313 u32 uregs[ELF_NGREG];
314 unsigned start, num_regs, i;
317 start = pos / sizeof(u32);
318 num_regs = count / sizeof(u32);
320 if (start + num_regs > ELF_NGREG)
323 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
328 for (i = start; i < num_regs; i++) {
330 * Cast all values to signed here so that if this is a 64-bit
331 * kernel, the supplied 32-bit values will be sign extended.
334 case MIPS32_EF_R1 ... MIPS32_EF_R25:
335 /* k0/k1 are ignored. */
336 case MIPS32_EF_R28 ... MIPS32_EF_R31:
337 regs->regs[i - MIPS32_EF_R0] = (s32)uregs[i];
340 regs->lo = (s32)uregs[i];
343 regs->hi = (s32)uregs[i];
345 case MIPS32_EF_CP0_EPC:
346 regs->cp0_epc = (s32)uregs[i];
351 /* System call number may have been changed */
352 mips_syscall_update_nr(target, regs);
357 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
361 static int gpr64_get(struct task_struct *target,
362 const struct user_regset *regset,
363 unsigned int pos, unsigned int count,
364 void *kbuf, void __user *ubuf)
366 struct pt_regs *regs = task_pt_regs(target);
367 u64 uregs[ELF_NGREG] = {};
369 mips_dump_regs64(uregs, regs);
370 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
374 static int gpr64_set(struct task_struct *target,
375 const struct user_regset *regset,
376 unsigned int pos, unsigned int count,
377 const void *kbuf, const void __user *ubuf)
379 struct pt_regs *regs = task_pt_regs(target);
380 u64 uregs[ELF_NGREG];
381 unsigned start, num_regs, i;
384 start = pos / sizeof(u64);
385 num_regs = count / sizeof(u64);
387 if (start + num_regs > ELF_NGREG)
390 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
395 for (i = start; i < num_regs; i++) {
397 case MIPS64_EF_R1 ... MIPS64_EF_R25:
398 /* k0/k1 are ignored. */
399 case MIPS64_EF_R28 ... MIPS64_EF_R31:
400 regs->regs[i - MIPS64_EF_R0] = uregs[i];
408 case MIPS64_EF_CP0_EPC:
409 regs->cp0_epc = uregs[i];
414 /* System call number may have been changed */
415 mips_syscall_update_nr(target, regs);
420 #endif /* CONFIG_64BIT */
422 static int fpr_get(struct task_struct *target,
423 const struct user_regset *regset,
424 unsigned int pos, unsigned int count,
425 void *kbuf, void __user *ubuf)
433 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
434 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
436 0, sizeof(elf_fpregset_t));
438 for (i = 0; i < NUM_FPU_REGS; i++) {
439 fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
440 err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
441 &fpr_val, i * sizeof(elf_fpreg_t),
442 (i + 1) * sizeof(elf_fpreg_t));
450 static int fpr_set(struct task_struct *target,
451 const struct user_regset *regset,
452 unsigned int pos, unsigned int count,
453 const void *kbuf, const void __user *ubuf)
463 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
464 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
466 0, sizeof(elf_fpregset_t));
468 BUILD_BUG_ON(sizeof(fpr_val) != sizeof(elf_fpreg_t));
469 for (i = 0; i < NUM_FPU_REGS && count >= sizeof(elf_fpreg_t); i++) {
470 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
471 &fpr_val, i * sizeof(elf_fpreg_t),
472 (i + 1) * sizeof(elf_fpreg_t));
475 set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val);
486 struct pt_regs_offset {
491 #define REG_OFFSET_NAME(reg, r) { \
493 .offset = offsetof(struct pt_regs, r) \
496 #define REG_OFFSET_END { \
501 static const struct pt_regs_offset regoffset_table[] = {
502 REG_OFFSET_NAME(r0, regs[0]),
503 REG_OFFSET_NAME(r1, regs[1]),
504 REG_OFFSET_NAME(r2, regs[2]),
505 REG_OFFSET_NAME(r3, regs[3]),
506 REG_OFFSET_NAME(r4, regs[4]),
507 REG_OFFSET_NAME(r5, regs[5]),
508 REG_OFFSET_NAME(r6, regs[6]),
509 REG_OFFSET_NAME(r7, regs[7]),
510 REG_OFFSET_NAME(r8, regs[8]),
511 REG_OFFSET_NAME(r9, regs[9]),
512 REG_OFFSET_NAME(r10, regs[10]),
513 REG_OFFSET_NAME(r11, regs[11]),
514 REG_OFFSET_NAME(r12, regs[12]),
515 REG_OFFSET_NAME(r13, regs[13]),
516 REG_OFFSET_NAME(r14, regs[14]),
517 REG_OFFSET_NAME(r15, regs[15]),
518 REG_OFFSET_NAME(r16, regs[16]),
519 REG_OFFSET_NAME(r17, regs[17]),
520 REG_OFFSET_NAME(r18, regs[18]),
521 REG_OFFSET_NAME(r19, regs[19]),
522 REG_OFFSET_NAME(r20, regs[20]),
523 REG_OFFSET_NAME(r21, regs[21]),
524 REG_OFFSET_NAME(r22, regs[22]),
525 REG_OFFSET_NAME(r23, regs[23]),
526 REG_OFFSET_NAME(r24, regs[24]),
527 REG_OFFSET_NAME(r25, regs[25]),
528 REG_OFFSET_NAME(r26, regs[26]),
529 REG_OFFSET_NAME(r27, regs[27]),
530 REG_OFFSET_NAME(r28, regs[28]),
531 REG_OFFSET_NAME(r29, regs[29]),
532 REG_OFFSET_NAME(r30, regs[30]),
533 REG_OFFSET_NAME(r31, regs[31]),
534 REG_OFFSET_NAME(c0_status, cp0_status),
535 REG_OFFSET_NAME(hi, hi),
536 REG_OFFSET_NAME(lo, lo),
537 #ifdef CONFIG_CPU_HAS_SMARTMIPS
538 REG_OFFSET_NAME(acx, acx),
540 REG_OFFSET_NAME(c0_badvaddr, cp0_badvaddr),
541 REG_OFFSET_NAME(c0_cause, cp0_cause),
542 REG_OFFSET_NAME(c0_epc, cp0_epc),
543 #ifdef CONFIG_CPU_CAVIUM_OCTEON
544 REG_OFFSET_NAME(mpl0, mpl[0]),
545 REG_OFFSET_NAME(mpl1, mpl[1]),
546 REG_OFFSET_NAME(mpl2, mpl[2]),
547 REG_OFFSET_NAME(mtp0, mtp[0]),
548 REG_OFFSET_NAME(mtp1, mtp[1]),
549 REG_OFFSET_NAME(mtp2, mtp[2]),
555 * regs_query_register_offset() - query register offset from its name
556 * @name: the name of a register
558 * regs_query_register_offset() returns the offset of a register in struct
559 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
561 int regs_query_register_offset(const char *name)
563 const struct pt_regs_offset *roff;
564 for (roff = regoffset_table; roff->name != NULL; roff++)
565 if (!strcmp(roff->name, name))
570 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
572 static const struct user_regset mips_regsets[] = {
574 .core_note_type = NT_PRSTATUS,
576 .size = sizeof(unsigned int),
577 .align = sizeof(unsigned int),
582 .core_note_type = NT_PRFPREG,
584 .size = sizeof(elf_fpreg_t),
585 .align = sizeof(elf_fpreg_t),
591 static const struct user_regset_view user_mips_view = {
593 .e_machine = ELF_ARCH,
594 .ei_osabi = ELF_OSABI,
595 .regsets = mips_regsets,
596 .n = ARRAY_SIZE(mips_regsets),
599 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
603 static const struct user_regset mips64_regsets[] = {
605 .core_note_type = NT_PRSTATUS,
607 .size = sizeof(unsigned long),
608 .align = sizeof(unsigned long),
613 .core_note_type = NT_PRFPREG,
615 .size = sizeof(elf_fpreg_t),
616 .align = sizeof(elf_fpreg_t),
622 static const struct user_regset_view user_mips64_view = {
624 .e_machine = ELF_ARCH,
625 .ei_osabi = ELF_OSABI,
626 .regsets = mips64_regsets,
627 .n = ARRAY_SIZE(mips64_regsets),
630 #ifdef CONFIG_MIPS32_N32
632 static const struct user_regset_view user_mipsn32_view = {
634 .e_flags = EF_MIPS_ABI2,
635 .e_machine = ELF_ARCH,
636 .ei_osabi = ELF_OSABI,
637 .regsets = mips64_regsets,
638 .n = ARRAY_SIZE(mips64_regsets),
641 #endif /* CONFIG_MIPS32_N32 */
643 #endif /* CONFIG_64BIT */
645 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
648 return &user_mips_view;
650 #ifdef CONFIG_MIPS32_O32
651 if (test_tsk_thread_flag(task, TIF_32BIT_REGS))
652 return &user_mips_view;
654 #ifdef CONFIG_MIPS32_N32
655 if (test_tsk_thread_flag(task, TIF_32BIT_ADDR))
656 return &user_mipsn32_view;
658 return &user_mips64_view;
662 long arch_ptrace(struct task_struct *child, long request,
663 unsigned long addr, unsigned long data)
666 void __user *addrp = (void __user *) addr;
667 void __user *datavp = (void __user *) data;
668 unsigned long __user *datalp = (void __user *) data;
671 /* when I and D space are separate, these will need to be fixed. */
672 case PTRACE_PEEKTEXT: /* read word at location addr. */
673 case PTRACE_PEEKDATA:
674 ret = generic_ptrace_peekdata(child, addr, data);
677 /* Read the word at location addr in the USER area. */
678 case PTRACE_PEEKUSR: {
679 struct pt_regs *regs;
681 unsigned long tmp = 0;
683 regs = task_pt_regs(child);
684 ret = 0; /* Default return value. */
688 tmp = regs->regs[addr];
690 case FPR_BASE ... FPR_BASE + 31:
691 if (!tsk_used_math(child)) {
692 /* FP not yet used */
696 fregs = get_fpu_regs(child);
699 if (test_thread_flag(TIF_32BIT_FPREGS)) {
701 * The odd registers are actually the high
702 * order bits of the values stored in the even
703 * registers - unless we're using r2k_switch.S.
705 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
710 tmp = get_fpr32(&fregs[addr - FPR_BASE], 0);
716 tmp = regs->cp0_cause;
719 tmp = regs->cp0_badvaddr;
727 #ifdef CONFIG_CPU_HAS_SMARTMIPS
733 tmp = child->thread.fpu.fcr31;
736 /* implementation / version register */
737 tmp = boot_cpu_data.fpu_id;
739 case DSP_BASE ... DSP_BASE + 5: {
747 dregs = __get_dsp_regs(child);
748 tmp = (unsigned long) (dregs[addr - DSP_BASE]);
757 tmp = child->thread.dsp.dspcontrol;
764 ret = put_user(tmp, datalp);
768 /* when I and D space are separate, this will have to be fixed. */
769 case PTRACE_POKETEXT: /* write the word at location addr. */
770 case PTRACE_POKEDATA:
771 ret = generic_ptrace_pokedata(child, addr, data);
774 case PTRACE_POKEUSR: {
775 struct pt_regs *regs;
777 regs = task_pt_regs(child);
781 regs->regs[addr] = data;
782 /* System call number may have been changed */
784 mips_syscall_update_nr(child, regs);
785 else if (addr == 4 &&
786 mips_syscall_is_indirect(child, regs))
787 mips_syscall_update_nr(child, regs);
789 case FPR_BASE ... FPR_BASE + 31: {
790 union fpureg *fregs = get_fpu_regs(child);
794 if (test_thread_flag(TIF_32BIT_FPREGS)) {
796 * The odd registers are actually the high
797 * order bits of the values stored in the even
798 * registers - unless we're using r2k_switch.S.
800 set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
805 set_fpr64(&fregs[addr - FPR_BASE], 0, data);
809 regs->cp0_epc = data;
817 #ifdef CONFIG_CPU_HAS_SMARTMIPS
824 ptrace_setfcr31(child, data);
826 case DSP_BASE ... DSP_BASE + 5: {
834 dregs = __get_dsp_regs(child);
835 dregs[addr - DSP_BASE] = data;
843 child->thread.dsp.dspcontrol = data;
846 /* The rest are not allowed. */
854 ret = ptrace_getregs(child, datavp);
858 ret = ptrace_setregs(child, datavp);
861 case PTRACE_GETFPREGS:
862 ret = ptrace_getfpregs(child, datavp);
865 case PTRACE_SETFPREGS:
866 ret = ptrace_setfpregs(child, datavp);
869 case PTRACE_GET_THREAD_AREA:
870 ret = put_user(task_thread_info(child)->tp_value, datalp);
873 case PTRACE_GET_WATCH_REGS:
874 ret = ptrace_get_watch_regs(child, addrp);
877 case PTRACE_SET_WATCH_REGS:
878 ret = ptrace_set_watch_regs(child, addrp);
882 ret = ptrace_request(child, request, addr, data);
890 * Notification of system call entry/exit
891 * - triggered by current->work.syscall_trace
893 asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
897 current_thread_info()->syscall = syscall;
899 if (test_thread_flag(TIF_SYSCALL_TRACE)) {
900 if (tracehook_report_syscall_entry(regs))
902 syscall = current_thread_info()->syscall;
905 #ifdef CONFIG_SECCOMP
906 if (unlikely(test_thread_flag(TIF_SECCOMP))) {
908 struct seccomp_data sd;
909 unsigned long args[6];
912 sd.arch = syscall_get_arch();
913 syscall_get_arguments(current, regs, 0, 6, args);
914 for (i = 0; i < 6; i++)
915 sd.args[i] = args[i];
916 sd.instruction_pointer = KSTK_EIP(current);
918 ret = __secure_computing(&sd);
921 syscall = current_thread_info()->syscall;
925 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
926 trace_sys_enter(regs, regs->regs[2]);
928 audit_syscall_entry(syscall, regs->regs[4], regs->regs[5],
929 regs->regs[6], regs->regs[7]);
932 * Negative syscall numbers are mistaken for rejected syscalls, but
933 * won't have had the return value set appropriately, so we do so now.
936 syscall_set_return_value(current, regs, -ENOSYS, 0);
941 * Notification of system call entry/exit
942 * - triggered by current->work.syscall_trace
944 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
947 * We may come here right after calling schedule_user()
948 * or do_notify_resume(), in which case we can be in RCU
953 audit_syscall_exit(regs);
955 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
956 trace_sys_exit(regs, regs_return_value(regs));
958 if (test_thread_flag(TIF_SYSCALL_TRACE))
959 tracehook_report_syscall_exit(regs, 0);