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. */
150 int ptrace_getfpregs(struct task_struct *child, __u32 __user *data)
154 if (!access_ok(VERIFY_WRITE, data, 33 * 8))
157 if (tsk_used_math(child)) {
158 union fpureg *fregs = get_fpu_regs(child);
159 for (i = 0; i < 32; i++)
160 __put_user(get_fpr64(&fregs[i], 0),
161 i + (__u64 __user *)data);
163 for (i = 0; i < 32; i++)
164 __put_user((__u64) -1, i + (__u64 __user *) data);
167 __put_user(child->thread.fpu.fcr31, data + 64);
168 __put_user(boot_cpu_data.fpu_id, data + 65);
173 int ptrace_setfpregs(struct task_struct *child, __u32 __user *data)
180 if (!access_ok(VERIFY_READ, data, 33 * 8))
184 fregs = get_fpu_regs(child);
186 for (i = 0; i < 32; i++) {
187 __get_user(fpr_val, i + (__u64 __user *)data);
188 set_fpr64(&fregs[i], 0, fpr_val);
191 __get_user(value, data + 64);
192 ptrace_setfcr31(child, value);
194 /* FIR may not be written. */
199 int ptrace_get_watch_regs(struct task_struct *child,
200 struct pt_watch_regs __user *addr)
202 enum pt_watch_style style;
205 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
207 if (!access_ok(VERIFY_WRITE, addr, sizeof(struct pt_watch_regs)))
211 style = pt_watch_style_mips32;
212 #define WATCH_STYLE mips32
214 style = pt_watch_style_mips64;
215 #define WATCH_STYLE mips64
218 __put_user(style, &addr->style);
219 __put_user(boot_cpu_data.watch_reg_use_cnt,
220 &addr->WATCH_STYLE.num_valid);
221 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
222 __put_user(child->thread.watch.mips3264.watchlo[i],
223 &addr->WATCH_STYLE.watchlo[i]);
224 __put_user(child->thread.watch.mips3264.watchhi[i] &
225 (MIPS_WATCHHI_MASK | MIPS_WATCHHI_IRW),
226 &addr->WATCH_STYLE.watchhi[i]);
227 __put_user(boot_cpu_data.watch_reg_masks[i],
228 &addr->WATCH_STYLE.watch_masks[i]);
231 __put_user(0, &addr->WATCH_STYLE.watchlo[i]);
232 __put_user(0, &addr->WATCH_STYLE.watchhi[i]);
233 __put_user(0, &addr->WATCH_STYLE.watch_masks[i]);
239 int ptrace_set_watch_regs(struct task_struct *child,
240 struct pt_watch_regs __user *addr)
243 int watch_active = 0;
244 unsigned long lt[NUM_WATCH_REGS];
245 u16 ht[NUM_WATCH_REGS];
247 if (!cpu_has_watch || boot_cpu_data.watch_reg_use_cnt == 0)
249 if (!access_ok(VERIFY_READ, addr, sizeof(struct pt_watch_regs)))
251 /* Check the values. */
252 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
253 __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]);
255 if (lt[i] & __UA_LIMIT)
258 if (test_tsk_thread_flag(child, TIF_32BIT_ADDR)) {
259 if (lt[i] & 0xffffffff80000000UL)
262 if (lt[i] & __UA_LIMIT)
266 __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]);
267 if (ht[i] & ~MIPS_WATCHHI_MASK)
271 for (i = 0; i < boot_cpu_data.watch_reg_use_cnt; i++) {
272 if (lt[i] & MIPS_WATCHLO_IRW)
274 child->thread.watch.mips3264.watchlo[i] = lt[i];
276 child->thread.watch.mips3264.watchhi[i] = ht[i];
280 set_tsk_thread_flag(child, TIF_LOAD_WATCH);
282 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
287 /* regset get/set implementations */
289 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
291 static int gpr32_get(struct task_struct *target,
292 const struct user_regset *regset,
293 unsigned int pos, unsigned int count,
294 void *kbuf, void __user *ubuf)
296 struct pt_regs *regs = task_pt_regs(target);
297 u32 uregs[ELF_NGREG] = {};
299 mips_dump_regs32(uregs, regs);
300 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
304 static int gpr32_set(struct task_struct *target,
305 const struct user_regset *regset,
306 unsigned int pos, unsigned int count,
307 const void *kbuf, const void __user *ubuf)
309 struct pt_regs *regs = task_pt_regs(target);
310 u32 uregs[ELF_NGREG];
311 unsigned start, num_regs, i;
314 start = pos / sizeof(u32);
315 num_regs = count / sizeof(u32);
317 if (start + num_regs > ELF_NGREG)
320 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
325 for (i = start; i < num_regs; i++) {
327 * Cast all values to signed here so that if this is a 64-bit
328 * kernel, the supplied 32-bit values will be sign extended.
331 case MIPS32_EF_R1 ... MIPS32_EF_R25:
332 /* k0/k1 are ignored. */
333 case MIPS32_EF_R28 ... MIPS32_EF_R31:
334 regs->regs[i - MIPS32_EF_R0] = (s32)uregs[i];
337 regs->lo = (s32)uregs[i];
340 regs->hi = (s32)uregs[i];
342 case MIPS32_EF_CP0_EPC:
343 regs->cp0_epc = (s32)uregs[i];
351 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
355 static int gpr64_get(struct task_struct *target,
356 const struct user_regset *regset,
357 unsigned int pos, unsigned int count,
358 void *kbuf, void __user *ubuf)
360 struct pt_regs *regs = task_pt_regs(target);
361 u64 uregs[ELF_NGREG] = {};
363 mips_dump_regs64(uregs, regs);
364 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
368 static int gpr64_set(struct task_struct *target,
369 const struct user_regset *regset,
370 unsigned int pos, unsigned int count,
371 const void *kbuf, const void __user *ubuf)
373 struct pt_regs *regs = task_pt_regs(target);
374 u64 uregs[ELF_NGREG];
375 unsigned start, num_regs, i;
378 start = pos / sizeof(u64);
379 num_regs = count / sizeof(u64);
381 if (start + num_regs > ELF_NGREG)
384 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
389 for (i = start; i < num_regs; i++) {
391 case MIPS64_EF_R1 ... MIPS64_EF_R25:
392 /* k0/k1 are ignored. */
393 case MIPS64_EF_R28 ... MIPS64_EF_R31:
394 regs->regs[i - MIPS64_EF_R0] = uregs[i];
402 case MIPS64_EF_CP0_EPC:
403 regs->cp0_epc = uregs[i];
411 #endif /* CONFIG_64BIT */
413 static int fpr_get(struct task_struct *target,
414 const struct user_regset *regset,
415 unsigned int pos, unsigned int count,
416 void *kbuf, void __user *ubuf)
424 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
425 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
427 0, sizeof(elf_fpregset_t));
429 for (i = 0; i < NUM_FPU_REGS; i++) {
430 fpr_val = get_fpr64(&target->thread.fpu.fpr[i], 0);
431 err = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
432 &fpr_val, i * sizeof(elf_fpreg_t),
433 (i + 1) * sizeof(elf_fpreg_t));
441 static int fpr_set(struct task_struct *target,
442 const struct user_regset *regset,
443 unsigned int pos, unsigned int count,
444 const void *kbuf, const void __user *ubuf)
454 if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
455 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
457 0, sizeof(elf_fpregset_t));
459 for (i = 0; i < NUM_FPU_REGS; i++) {
460 err = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
461 &fpr_val, i * sizeof(elf_fpreg_t),
462 (i + 1) * sizeof(elf_fpreg_t));
465 set_fpr64(&target->thread.fpu.fpr[i], 0, fpr_val);
476 struct pt_regs_offset {
481 #define REG_OFFSET_NAME(reg, r) { \
483 .offset = offsetof(struct pt_regs, r) \
486 #define REG_OFFSET_END { \
491 static const struct pt_regs_offset regoffset_table[] = {
492 REG_OFFSET_NAME(r0, regs[0]),
493 REG_OFFSET_NAME(r1, regs[1]),
494 REG_OFFSET_NAME(r2, regs[2]),
495 REG_OFFSET_NAME(r3, regs[3]),
496 REG_OFFSET_NAME(r4, regs[4]),
497 REG_OFFSET_NAME(r5, regs[5]),
498 REG_OFFSET_NAME(r6, regs[6]),
499 REG_OFFSET_NAME(r7, regs[7]),
500 REG_OFFSET_NAME(r8, regs[8]),
501 REG_OFFSET_NAME(r9, regs[9]),
502 REG_OFFSET_NAME(r10, regs[10]),
503 REG_OFFSET_NAME(r11, regs[11]),
504 REG_OFFSET_NAME(r12, regs[12]),
505 REG_OFFSET_NAME(r13, regs[13]),
506 REG_OFFSET_NAME(r14, regs[14]),
507 REG_OFFSET_NAME(r15, regs[15]),
508 REG_OFFSET_NAME(r16, regs[16]),
509 REG_OFFSET_NAME(r17, regs[17]),
510 REG_OFFSET_NAME(r18, regs[18]),
511 REG_OFFSET_NAME(r19, regs[19]),
512 REG_OFFSET_NAME(r20, regs[20]),
513 REG_OFFSET_NAME(r21, regs[21]),
514 REG_OFFSET_NAME(r22, regs[22]),
515 REG_OFFSET_NAME(r23, regs[23]),
516 REG_OFFSET_NAME(r24, regs[24]),
517 REG_OFFSET_NAME(r25, regs[25]),
518 REG_OFFSET_NAME(r26, regs[26]),
519 REG_OFFSET_NAME(r27, regs[27]),
520 REG_OFFSET_NAME(r28, regs[28]),
521 REG_OFFSET_NAME(r29, regs[29]),
522 REG_OFFSET_NAME(r30, regs[30]),
523 REG_OFFSET_NAME(r31, regs[31]),
524 REG_OFFSET_NAME(c0_status, cp0_status),
525 REG_OFFSET_NAME(hi, hi),
526 REG_OFFSET_NAME(lo, lo),
527 #ifdef CONFIG_CPU_HAS_SMARTMIPS
528 REG_OFFSET_NAME(acx, acx),
530 REG_OFFSET_NAME(c0_badvaddr, cp0_badvaddr),
531 REG_OFFSET_NAME(c0_cause, cp0_cause),
532 REG_OFFSET_NAME(c0_epc, cp0_epc),
533 #ifdef CONFIG_CPU_CAVIUM_OCTEON
534 REG_OFFSET_NAME(mpl0, mpl[0]),
535 REG_OFFSET_NAME(mpl1, mpl[1]),
536 REG_OFFSET_NAME(mpl2, mpl[2]),
537 REG_OFFSET_NAME(mtp0, mtp[0]),
538 REG_OFFSET_NAME(mtp1, mtp[1]),
539 REG_OFFSET_NAME(mtp2, mtp[2]),
545 * regs_query_register_offset() - query register offset from its name
546 * @name: the name of a register
548 * regs_query_register_offset() returns the offset of a register in struct
549 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
551 int regs_query_register_offset(const char *name)
553 const struct pt_regs_offset *roff;
554 for (roff = regoffset_table; roff->name != NULL; roff++)
555 if (!strcmp(roff->name, name))
560 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
562 static const struct user_regset mips_regsets[] = {
564 .core_note_type = NT_PRSTATUS,
566 .size = sizeof(unsigned int),
567 .align = sizeof(unsigned int),
572 .core_note_type = NT_PRFPREG,
574 .size = sizeof(elf_fpreg_t),
575 .align = sizeof(elf_fpreg_t),
581 static const struct user_regset_view user_mips_view = {
583 .e_machine = ELF_ARCH,
584 .ei_osabi = ELF_OSABI,
585 .regsets = mips_regsets,
586 .n = ARRAY_SIZE(mips_regsets),
589 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
593 static const struct user_regset mips64_regsets[] = {
595 .core_note_type = NT_PRSTATUS,
597 .size = sizeof(unsigned long),
598 .align = sizeof(unsigned long),
603 .core_note_type = NT_PRFPREG,
605 .size = sizeof(elf_fpreg_t),
606 .align = sizeof(elf_fpreg_t),
612 static const struct user_regset_view user_mips64_view = {
614 .e_machine = ELF_ARCH,
615 .ei_osabi = ELF_OSABI,
616 .regsets = mips64_regsets,
617 .n = ARRAY_SIZE(mips64_regsets),
620 #endif /* CONFIG_64BIT */
622 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
625 return &user_mips_view;
627 #ifdef CONFIG_MIPS32_O32
628 if (test_tsk_thread_flag(task, TIF_32BIT_REGS))
629 return &user_mips_view;
631 return &user_mips64_view;
635 long arch_ptrace(struct task_struct *child, long request,
636 unsigned long addr, unsigned long data)
639 void __user *addrp = (void __user *) addr;
640 void __user *datavp = (void __user *) data;
641 unsigned long __user *datalp = (void __user *) data;
644 /* when I and D space are separate, these will need to be fixed. */
645 case PTRACE_PEEKTEXT: /* read word at location addr. */
646 case PTRACE_PEEKDATA:
647 ret = generic_ptrace_peekdata(child, addr, data);
650 /* Read the word at location addr in the USER area. */
651 case PTRACE_PEEKUSR: {
652 struct pt_regs *regs;
654 unsigned long tmp = 0;
656 regs = task_pt_regs(child);
657 ret = 0; /* Default return value. */
661 tmp = regs->regs[addr];
663 case FPR_BASE ... FPR_BASE + 31:
664 if (!tsk_used_math(child)) {
665 /* FP not yet used */
669 fregs = get_fpu_regs(child);
672 if (test_thread_flag(TIF_32BIT_FPREGS)) {
674 * The odd registers are actually the high
675 * order bits of the values stored in the even
676 * registers - unless we're using r2k_switch.S.
678 tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
683 tmp = get_fpr32(&fregs[addr - FPR_BASE], 0);
689 tmp = regs->cp0_cause;
692 tmp = regs->cp0_badvaddr;
700 #ifdef CONFIG_CPU_HAS_SMARTMIPS
706 tmp = child->thread.fpu.fcr31;
709 /* implementation / version register */
710 tmp = boot_cpu_data.fpu_id;
712 case DSP_BASE ... DSP_BASE + 5: {
720 dregs = __get_dsp_regs(child);
721 tmp = (unsigned long) (dregs[addr - DSP_BASE]);
730 tmp = child->thread.dsp.dspcontrol;
737 ret = put_user(tmp, datalp);
741 /* when I and D space are separate, this will have to be fixed. */
742 case PTRACE_POKETEXT: /* write the word at location addr. */
743 case PTRACE_POKEDATA:
744 ret = generic_ptrace_pokedata(child, addr, data);
747 case PTRACE_POKEUSR: {
748 struct pt_regs *regs;
750 regs = task_pt_regs(child);
754 regs->regs[addr] = data;
756 case FPR_BASE ... FPR_BASE + 31: {
757 union fpureg *fregs = get_fpu_regs(child);
761 if (test_thread_flag(TIF_32BIT_FPREGS)) {
763 * The odd registers are actually the high
764 * order bits of the values stored in the even
765 * registers - unless we're using r2k_switch.S.
767 set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
772 set_fpr64(&fregs[addr - FPR_BASE], 0, data);
776 regs->cp0_epc = data;
784 #ifdef CONFIG_CPU_HAS_SMARTMIPS
791 ptrace_setfcr31(child, data);
793 case DSP_BASE ... DSP_BASE + 5: {
801 dregs = __get_dsp_regs(child);
802 dregs[addr - DSP_BASE] = data;
810 child->thread.dsp.dspcontrol = data;
813 /* The rest are not allowed. */
821 ret = ptrace_getregs(child, datavp);
825 ret = ptrace_setregs(child, datavp);
828 case PTRACE_GETFPREGS:
829 ret = ptrace_getfpregs(child, datavp);
832 case PTRACE_SETFPREGS:
833 ret = ptrace_setfpregs(child, datavp);
836 case PTRACE_GET_THREAD_AREA:
837 ret = put_user(task_thread_info(child)->tp_value, datalp);
840 case PTRACE_GET_WATCH_REGS:
841 ret = ptrace_get_watch_regs(child, addrp);
844 case PTRACE_SET_WATCH_REGS:
845 ret = ptrace_set_watch_regs(child, addrp);
849 ret = ptrace_request(child, request, addr, data);
857 * Notification of system call entry/exit
858 * - triggered by current->work.syscall_trace
860 asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
864 current_thread_info()->syscall = syscall;
866 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
867 tracehook_report_syscall_entry(regs))
870 if (secure_computing(NULL) == -1)
873 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
874 trace_sys_enter(regs, regs->regs[2]);
876 audit_syscall_entry(syscall, regs->regs[4], regs->regs[5],
877 regs->regs[6], regs->regs[7]);
882 * Notification of system call entry/exit
883 * - triggered by current->work.syscall_trace
885 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
888 * We may come here right after calling schedule_user()
889 * or do_notify_resume(), in which case we can be in RCU
894 audit_syscall_exit(regs);
896 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
897 trace_sys_exit(regs, regs->regs[2]);
899 if (test_thread_flag(TIF_SYSCALL_TRACE))
900 tracehook_report_syscall_exit(regs, 0);