1 /* ptrace.c: Sparc process tracing support.
3 * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
9 * Added Linux support -miguel (weird, eh?, the original code was meant
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
16 #include <linux/errno.h>
17 #include <linux/export.h>
18 #include <linux/ptrace.h>
19 #include <linux/user.h>
20 #include <linux/smp.h>
21 #include <linux/security.h>
22 #include <linux/seccomp.h>
23 #include <linux/audit.h>
24 #include <linux/signal.h>
25 #include <linux/regset.h>
26 #include <linux/tracehook.h>
27 #include <trace/syscall.h>
28 #include <linux/compat.h>
29 #include <linux/elf.h>
30 #include <linux/context_tracking.h>
33 #include <asm/pgtable.h>
34 #include <linux/uaccess.h>
35 #include <asm/psrcompat.h>
36 #include <asm/visasm.h>
37 #include <asm/spitfire.h>
39 #include <asm/cpudata.h>
40 #include <asm/cacheflush.h>
42 #define CREATE_TRACE_POINTS
43 #include <trace/events/syscalls.h>
47 /* #define ALLOW_INIT_TRACING */
49 struct pt_regs_offset {
54 #define REG_OFFSET_NAME(n, r) \
55 {.name = n, .offset = (PT_V9_##r)}
56 #define REG_OFFSET_END {.name = NULL, .offset = 0}
58 static const struct pt_regs_offset regoffset_table[] = {
59 REG_OFFSET_NAME("g0", G0),
60 REG_OFFSET_NAME("g1", G1),
61 REG_OFFSET_NAME("g2", G2),
62 REG_OFFSET_NAME("g3", G3),
63 REG_OFFSET_NAME("g4", G4),
64 REG_OFFSET_NAME("g5", G5),
65 REG_OFFSET_NAME("g6", G6),
66 REG_OFFSET_NAME("g7", G7),
68 REG_OFFSET_NAME("i0", I0),
69 REG_OFFSET_NAME("i1", I1),
70 REG_OFFSET_NAME("i2", I2),
71 REG_OFFSET_NAME("i3", I3),
72 REG_OFFSET_NAME("i4", I4),
73 REG_OFFSET_NAME("i5", I5),
74 REG_OFFSET_NAME("i6", I6),
75 REG_OFFSET_NAME("i7", I7),
77 REG_OFFSET_NAME("tstate", TSTATE),
78 REG_OFFSET_NAME("pc", TPC),
79 REG_OFFSET_NAME("npc", TNPC),
80 REG_OFFSET_NAME("y", Y),
81 REG_OFFSET_NAME("lr", I7),
87 * Called by kernel/ptrace.c when detaching..
89 * Make sure single step bits etc are not set.
91 void ptrace_disable(struct task_struct *child)
96 /* To get the necessary page struct, access_process_vm() first calls
97 * get_user_pages(). This has done a flush_dcache_page() on the
98 * accessed page. Then our caller (copy_{to,from}_user_page()) did
99 * to memcpy to read/write the data from that page.
101 * Now, the only thing we have to do is:
102 * 1) flush the D-cache if it's possible than an illegal alias
104 * 2) flush the I-cache if this is pre-cheetah and we did a write
106 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
107 unsigned long uaddr, void *kaddr,
108 unsigned long len, int write)
110 BUG_ON(len > PAGE_SIZE);
112 if (tlb_type == hypervisor)
117 #ifdef DCACHE_ALIASING_POSSIBLE
118 /* If bit 13 of the kernel address we used to access the
119 * user page is the same as the virtual address that page
120 * is mapped to in the user's address space, we can skip the
123 if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
124 unsigned long start = __pa(kaddr);
125 unsigned long end = start + len;
126 unsigned long dcache_line_size;
128 dcache_line_size = local_cpu_data().dcache_line_size;
130 if (tlb_type == spitfire) {
131 for (; start < end; start += dcache_line_size)
132 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
134 start &= ~(dcache_line_size - 1);
135 for (; start < end; start += dcache_line_size)
136 __asm__ __volatile__(
137 "stxa %%g0, [%0] %1\n\t"
141 "i" (ASI_DCACHE_INVALIDATE));
145 if (write && tlb_type == spitfire) {
146 unsigned long start = (unsigned long) kaddr;
147 unsigned long end = start + len;
148 unsigned long icache_line_size;
150 icache_line_size = local_cpu_data().icache_line_size;
152 for (; start < end; start += icache_line_size)
158 EXPORT_SYMBOL_GPL(flush_ptrace_access);
160 static int get_from_target(struct task_struct *target, unsigned long uaddr,
163 if (target == current) {
164 if (copy_from_user(kbuf, (void __user *) uaddr, len))
167 int len2 = access_process_vm(target, uaddr, kbuf, len,
175 static int set_to_target(struct task_struct *target, unsigned long uaddr,
178 if (target == current) {
179 if (copy_to_user((void __user *) uaddr, kbuf, len))
182 int len2 = access_process_vm(target, uaddr, kbuf, len,
183 FOLL_FORCE | FOLL_WRITE);
190 static int regwindow64_get(struct task_struct *target,
191 const struct pt_regs *regs,
192 struct reg_window *wbuf)
194 unsigned long rw_addr = regs->u_regs[UREG_I6];
196 if (!test_thread_64bit_stack(rw_addr)) {
197 struct reg_window32 win32;
200 if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
202 for (i = 0; i < 8; i++)
203 wbuf->locals[i] = win32.locals[i];
204 for (i = 0; i < 8; i++)
205 wbuf->ins[i] = win32.ins[i];
207 rw_addr += STACK_BIAS;
208 if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
215 static int regwindow64_set(struct task_struct *target,
216 const struct pt_regs *regs,
217 struct reg_window *wbuf)
219 unsigned long rw_addr = regs->u_regs[UREG_I6];
221 if (!test_thread_64bit_stack(rw_addr)) {
222 struct reg_window32 win32;
225 for (i = 0; i < 8; i++)
226 win32.locals[i] = wbuf->locals[i];
227 for (i = 0; i < 8; i++)
228 win32.ins[i] = wbuf->ins[i];
230 if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
233 rw_addr += STACK_BIAS;
234 if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
246 static int genregs64_get(struct task_struct *target,
247 const struct user_regset *regset,
248 unsigned int pos, unsigned int count,
249 void *kbuf, void __user *ubuf)
251 const struct pt_regs *regs = task_pt_regs(target);
254 if (target == current)
257 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
259 0, 16 * sizeof(u64));
260 if (!ret && count && pos < (32 * sizeof(u64))) {
261 struct reg_window window;
263 if (regwindow64_get(target, regs, &window))
265 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
272 /* TSTATE, TPC, TNPC */
273 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
280 unsigned long y = regs->y;
282 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
289 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
290 36 * sizeof(u64), -1);
296 static int genregs64_set(struct task_struct *target,
297 const struct user_regset *regset,
298 unsigned int pos, unsigned int count,
299 const void *kbuf, const void __user *ubuf)
301 struct pt_regs *regs = task_pt_regs(target);
304 if (target == current)
307 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
309 0, 16 * sizeof(u64));
310 if (!ret && count && pos < (32 * sizeof(u64))) {
311 struct reg_window window;
313 if (regwindow64_get(target, regs, &window))
316 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
322 regwindow64_set(target, regs, &window))
326 if (!ret && count > 0) {
327 unsigned long tstate;
330 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
335 /* Only the condition codes and the "in syscall"
336 * state can be modified in the %tstate register.
338 tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
339 regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
340 regs->tstate |= tstate;
346 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
355 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
364 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
365 36 * sizeof(u64), -1);
370 static int fpregs64_get(struct task_struct *target,
371 const struct user_regset *regset,
372 unsigned int pos, unsigned int count,
373 void *kbuf, void __user *ubuf)
375 const unsigned long *fpregs = task_thread_info(target)->fpregs;
376 unsigned long fprs, fsr, gsr;
379 if (target == current)
380 save_and_clear_fpu();
382 fprs = task_thread_info(target)->fpsaved[0];
385 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
387 0, 16 * sizeof(u64));
389 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
395 ret = user_regset_copyout(&pos, &count,
401 ret = user_regset_copyout_zero(&pos, &count,
407 if (fprs & FPRS_FEF) {
408 fsr = task_thread_info(target)->xfsr[0];
409 gsr = task_thread_info(target)->gsr[0];
415 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
420 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
425 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
431 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
432 35 * sizeof(u64), -1);
437 static int fpregs64_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)
442 unsigned long *fpregs = task_thread_info(target)->fpregs;
446 if (target == current)
447 save_and_clear_fpu();
449 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
451 0, 32 * sizeof(u64));
453 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
454 task_thread_info(target)->xfsr,
458 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
459 task_thread_info(target)->gsr,
463 fprs = task_thread_info(target)->fpsaved[0];
464 if (!ret && count > 0) {
465 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
471 fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
472 task_thread_info(target)->fpsaved[0] = fprs;
475 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
476 35 * sizeof(u64), -1);
480 static const struct user_regset sparc64_regsets[] = {
486 * TSTATE, TPC, TNPC, Y
489 .core_note_type = NT_PRSTATUS,
491 .size = sizeof(u64), .align = sizeof(u64),
492 .get = genregs64_get, .set = genregs64_set
501 .core_note_type = NT_PRFPREG,
503 .size = sizeof(u64), .align = sizeof(u64),
504 .get = fpregs64_get, .set = fpregs64_set
508 static const struct user_regset_view user_sparc64_view = {
509 .name = "sparc64", .e_machine = EM_SPARCV9,
510 .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
514 static int genregs32_get(struct task_struct *target,
515 const struct user_regset *regset,
516 unsigned int pos, unsigned int count,
517 void *kbuf, void __user *ubuf)
519 const struct pt_regs *regs = task_pt_regs(target);
520 compat_ulong_t __user *reg_window;
521 compat_ulong_t *k = kbuf;
522 compat_ulong_t __user *u = ubuf;
525 if (target == current)
529 count /= sizeof(reg);
532 for (; count > 0 && pos < 16; count--)
533 *k++ = regs->u_regs[pos++];
535 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
537 if (target == current) {
538 for (; count > 0 && pos < 32; count--) {
539 if (get_user(*k++, ®_window[pos++]))
543 for (; count > 0 && pos < 32; count--) {
544 if (access_process_vm(target,
556 for (; count > 0 && pos < 16; count--) {
557 if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
561 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
563 if (target == current) {
564 for (; count > 0 && pos < 32; count--) {
565 if (get_user(reg, ®_window[pos++]) ||
570 for (; count > 0 && pos < 32; count--) {
571 if (access_process_vm(target,
578 if (access_process_vm(target,
581 FOLL_FORCE | FOLL_WRITE)
592 reg = tstate_to_psr(regs->tstate);
613 else if (put_user(reg, u++))
620 count *= sizeof(reg);
622 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
623 38 * sizeof(reg), -1);
626 static int genregs32_set(struct task_struct *target,
627 const struct user_regset *regset,
628 unsigned int pos, unsigned int count,
629 const void *kbuf, const void __user *ubuf)
631 struct pt_regs *regs = task_pt_regs(target);
632 compat_ulong_t __user *reg_window;
633 const compat_ulong_t *k = kbuf;
634 const compat_ulong_t __user *u = ubuf;
637 if (target == current)
641 count /= sizeof(reg);
644 for (; count > 0 && pos < 16; count--)
645 regs->u_regs[pos++] = *k++;
647 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
649 if (target == current) {
650 for (; count > 0 && pos < 32; count--) {
651 if (put_user(*k++, ®_window[pos++]))
655 for (; count > 0 && pos < 32; count--) {
656 if (access_process_vm(target,
661 FOLL_FORCE | FOLL_WRITE)
669 for (; count > 0 && pos < 16; count--) {
670 if (get_user(reg, u++))
672 regs->u_regs[pos++] = reg;
675 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
677 if (target == current) {
678 for (; count > 0 && pos < 32; count--) {
679 if (get_user(reg, u++) ||
680 put_user(reg, ®_window[pos++]))
684 for (; count > 0 && pos < 32; count--) {
685 if (access_process_vm(target,
692 if (access_process_vm(target,
696 FOLL_FORCE | FOLL_WRITE)
705 unsigned long tstate;
709 else if (get_user(reg, u++))
714 tstate = regs->tstate;
715 tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
716 tstate |= psr_to_tstate_icc(reg);
717 if (reg & PSR_SYSCALL)
718 tstate |= TSTATE_SYSCALL;
719 regs->tstate = tstate;
742 count *= sizeof(reg);
744 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
745 38 * sizeof(reg), -1);
748 static int fpregs32_get(struct task_struct *target,
749 const struct user_regset *regset,
750 unsigned int pos, unsigned int count,
751 void *kbuf, void __user *ubuf)
753 const unsigned long *fpregs = task_thread_info(target)->fpregs;
754 compat_ulong_t enabled;
759 if (target == current)
760 save_and_clear_fpu();
762 fprs = task_thread_info(target)->fpsaved[0];
763 if (fprs & FPRS_FEF) {
764 fsr = task_thread_info(target)->xfsr[0];
771 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
773 0, 32 * sizeof(u32));
776 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
780 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
788 val = (enabled << 8) | (8 << 16);
789 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
796 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
797 35 * sizeof(u32), -1);
802 static int fpregs32_set(struct task_struct *target,
803 const struct user_regset *regset,
804 unsigned int pos, unsigned int count,
805 const void *kbuf, const void __user *ubuf)
807 unsigned long *fpregs = task_thread_info(target)->fpregs;
811 if (target == current)
812 save_and_clear_fpu();
814 fprs = task_thread_info(target)->fpsaved[0];
816 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
818 0, 32 * sizeof(u32));
820 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
823 if (!ret && count > 0) {
827 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
832 val = task_thread_info(target)->xfsr[0];
833 val &= 0xffffffff00000000UL;
835 task_thread_info(target)->xfsr[0] = val;
839 fprs |= (FPRS_FEF | FPRS_DL);
840 task_thread_info(target)->fpsaved[0] = fprs;
843 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
844 34 * sizeof(u32), -1);
848 static const struct user_regset sparc32_regsets[] = {
854 * PSR, PC, nPC, Y, WIM, TBR
857 .core_note_type = NT_PRSTATUS,
859 .size = sizeof(u32), .align = sizeof(u32),
860 .get = genregs32_get, .set = genregs32_set
866 * FPU QUEUE COUNT (8-bit char)
867 * FPU QUEUE ENTRYSIZE (8-bit char)
868 * FPU ENABLED (8-bit char)
870 * FPU QUEUE (64 32-bit ints)
873 .core_note_type = NT_PRFPREG,
875 .size = sizeof(u32), .align = sizeof(u32),
876 .get = fpregs32_get, .set = fpregs32_set
880 static const struct user_regset_view user_sparc32_view = {
881 .name = "sparc", .e_machine = EM_SPARC,
882 .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
884 #endif /* CONFIG_COMPAT */
886 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
889 if (test_tsk_thread_flag(task, TIF_32BIT))
890 return &user_sparc32_view;
892 return &user_sparc64_view;
897 unsigned int regs[32];
903 unsigned int insnaddr;
908 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
909 compat_ulong_t caddr, compat_ulong_t cdata)
911 const struct user_regset_view *view = task_user_regset_view(current);
912 compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
913 struct pt_regs32 __user *pregs;
914 struct compat_fps __user *fps;
915 unsigned long addr2 = caddr2;
916 unsigned long addr = caddr;
917 unsigned long data = cdata;
920 pregs = (struct pt_regs32 __user *) addr;
921 fps = (struct compat_fps __user *) addr;
925 ret = (addr != 0) ? -EIO : 0;
929 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
934 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
941 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
946 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
952 case PTRACE_GETFPREGS:
953 ret = copy_regset_to_user(child, view, REGSET_FP,
958 ret = copy_regset_to_user(child, view, REGSET_FP,
963 if (__put_user(0, &fps->flags) ||
964 __put_user(0, &fps->extra) ||
965 __put_user(0, &fps->fpqd) ||
966 clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
971 case PTRACE_SETFPREGS:
972 ret = copy_regset_from_user(child, view, REGSET_FP,
977 ret = copy_regset_from_user(child, view, REGSET_FP,
983 case PTRACE_READTEXT:
984 case PTRACE_READDATA:
985 ret = ptrace_readdata(child, addr,
986 (char __user *)addr2, data);
993 case PTRACE_WRITETEXT:
994 case PTRACE_WRITEDATA:
995 ret = ptrace_writedata(child, (char __user *) addr2,
1004 if (request == PTRACE_SPARC_DETACH)
1005 request = PTRACE_DETACH;
1006 ret = compat_ptrace_request(child, request, addr, data);
1012 #endif /* CONFIG_COMPAT */
1015 unsigned int regs[64];
1019 long arch_ptrace(struct task_struct *child, long request,
1020 unsigned long addr, unsigned long data)
1022 const struct user_regset_view *view = task_user_regset_view(current);
1023 unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
1024 struct pt_regs __user *pregs;
1025 struct fps __user *fps;
1026 void __user *addr2p;
1029 pregs = (struct pt_regs __user *) addr;
1030 fps = (struct fps __user *) addr;
1031 addr2p = (void __user *) addr2;
1034 case PTRACE_PEEKUSR:
1035 ret = (addr != 0) ? -EIO : 0;
1038 case PTRACE_GETREGS64:
1039 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1044 /* XXX doesn't handle 'y' register correctly XXX */
1045 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1052 case PTRACE_SETREGS64:
1053 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1058 /* XXX doesn't handle 'y' register correctly XXX */
1059 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1066 case PTRACE_GETFPREGS64:
1067 ret = copy_regset_to_user(child, view, REGSET_FP,
1073 case PTRACE_SETFPREGS64:
1074 ret = copy_regset_from_user(child, view, REGSET_FP,
1080 case PTRACE_READTEXT:
1081 case PTRACE_READDATA:
1082 ret = ptrace_readdata(child, addr, addr2p, data);
1089 case PTRACE_WRITETEXT:
1090 case PTRACE_WRITEDATA:
1091 ret = ptrace_writedata(child, addr2p, addr, data);
1099 if (request == PTRACE_SPARC_DETACH)
1100 request = PTRACE_DETACH;
1101 ret = ptrace_request(child, request, addr, data);
1108 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1112 /* do the secure computing check first */
1113 secure_computing_strict(regs->u_regs[UREG_G1]);
1115 if (test_thread_flag(TIF_NOHZ))
1118 if (test_thread_flag(TIF_SYSCALL_TRACE))
1119 ret = tracehook_report_syscall_entry(regs);
1121 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1122 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1124 audit_syscall_entry(regs->u_regs[UREG_G1], regs->u_regs[UREG_I0],
1125 regs->u_regs[UREG_I1], regs->u_regs[UREG_I2],
1126 regs->u_regs[UREG_I3]);
1131 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1133 if (test_thread_flag(TIF_NOHZ))
1136 audit_syscall_exit(regs);
1138 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1139 trace_sys_exit(regs, regs->u_regs[UREG_I0]);
1141 if (test_thread_flag(TIF_SYSCALL_TRACE))
1142 tracehook_report_syscall_exit(regs, 0);
1144 if (test_thread_flag(TIF_NOHZ))
1149 * regs_query_register_offset() - query register offset from its name
1150 * @name: the name of a register
1152 * regs_query_register_offset() returns the offset of a register in struct
1153 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
1155 int regs_query_register_offset(const char *name)
1157 const struct pt_regs_offset *roff;
1159 for (roff = regoffset_table; roff->name != NULL; roff++)
1160 if (!strcmp(roff->name, name))
1161 return roff->offset;