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>
15 #include <linux/sched/task_stack.h>
17 #include <linux/errno.h>
18 #include <linux/export.h>
19 #include <linux/ptrace.h>
20 #include <linux/user.h>
21 #include <linux/smp.h>
22 #include <linux/security.h>
23 #include <linux/seccomp.h>
24 #include <linux/audit.h>
25 #include <linux/signal.h>
26 #include <linux/regset.h>
27 #include <linux/tracehook.h>
28 #include <trace/syscall.h>
29 #include <linux/compat.h>
30 #include <linux/elf.h>
31 #include <linux/context_tracking.h>
34 #include <asm/pgtable.h>
35 #include <linux/uaccess.h>
36 #include <asm/psrcompat.h>
37 #include <asm/visasm.h>
38 #include <asm/spitfire.h>
40 #include <asm/cpudata.h>
41 #include <asm/cacheflush.h>
43 #define CREATE_TRACE_POINTS
44 #include <trace/events/syscalls.h>
48 /* #define ALLOW_INIT_TRACING */
50 struct pt_regs_offset {
55 #define REG_OFFSET_NAME(n, r) \
56 {.name = n, .offset = (PT_V9_##r)}
57 #define REG_OFFSET_END {.name = NULL, .offset = 0}
59 static const struct pt_regs_offset regoffset_table[] = {
60 REG_OFFSET_NAME("g0", G0),
61 REG_OFFSET_NAME("g1", G1),
62 REG_OFFSET_NAME("g2", G2),
63 REG_OFFSET_NAME("g3", G3),
64 REG_OFFSET_NAME("g4", G4),
65 REG_OFFSET_NAME("g5", G5),
66 REG_OFFSET_NAME("g6", G6),
67 REG_OFFSET_NAME("g7", G7),
69 REG_OFFSET_NAME("i0", I0),
70 REG_OFFSET_NAME("i1", I1),
71 REG_OFFSET_NAME("i2", I2),
72 REG_OFFSET_NAME("i3", I3),
73 REG_OFFSET_NAME("i4", I4),
74 REG_OFFSET_NAME("i5", I5),
75 REG_OFFSET_NAME("i6", I6),
76 REG_OFFSET_NAME("i7", I7),
78 REG_OFFSET_NAME("tstate", TSTATE),
79 REG_OFFSET_NAME("pc", TPC),
80 REG_OFFSET_NAME("npc", TNPC),
81 REG_OFFSET_NAME("y", Y),
82 REG_OFFSET_NAME("lr", I7),
88 * Called by kernel/ptrace.c when detaching..
90 * Make sure single step bits etc are not set.
92 void ptrace_disable(struct task_struct *child)
97 /* To get the necessary page struct, access_process_vm() first calls
98 * get_user_pages(). This has done a flush_dcache_page() on the
99 * accessed page. Then our caller (copy_{to,from}_user_page()) did
100 * to memcpy to read/write the data from that page.
102 * Now, the only thing we have to do is:
103 * 1) flush the D-cache if it's possible than an illegal alias
105 * 2) flush the I-cache if this is pre-cheetah and we did a write
107 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
108 unsigned long uaddr, void *kaddr,
109 unsigned long len, int write)
111 BUG_ON(len > PAGE_SIZE);
113 if (tlb_type == hypervisor)
118 #ifdef DCACHE_ALIASING_POSSIBLE
119 /* If bit 13 of the kernel address we used to access the
120 * user page is the same as the virtual address that page
121 * is mapped to in the user's address space, we can skip the
124 if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
125 unsigned long start = __pa(kaddr);
126 unsigned long end = start + len;
127 unsigned long dcache_line_size;
129 dcache_line_size = local_cpu_data().dcache_line_size;
131 if (tlb_type == spitfire) {
132 for (; start < end; start += dcache_line_size)
133 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
135 start &= ~(dcache_line_size - 1);
136 for (; start < end; start += dcache_line_size)
137 __asm__ __volatile__(
138 "stxa %%g0, [%0] %1\n\t"
142 "i" (ASI_DCACHE_INVALIDATE));
146 if (write && tlb_type == spitfire) {
147 unsigned long start = (unsigned long) kaddr;
148 unsigned long end = start + len;
149 unsigned long icache_line_size;
151 icache_line_size = local_cpu_data().icache_line_size;
153 for (; start < end; start += icache_line_size)
159 EXPORT_SYMBOL_GPL(flush_ptrace_access);
161 static int get_from_target(struct task_struct *target, unsigned long uaddr,
164 if (target == current) {
165 if (copy_from_user(kbuf, (void __user *) uaddr, len))
168 int len2 = access_process_vm(target, uaddr, kbuf, len,
176 static int set_to_target(struct task_struct *target, unsigned long uaddr,
179 if (target == current) {
180 if (copy_to_user((void __user *) uaddr, kbuf, len))
183 int len2 = access_process_vm(target, uaddr, kbuf, len,
184 FOLL_FORCE | FOLL_WRITE);
191 static int regwindow64_get(struct task_struct *target,
192 const struct pt_regs *regs,
193 struct reg_window *wbuf)
195 unsigned long rw_addr = regs->u_regs[UREG_I6];
197 if (!test_thread_64bit_stack(rw_addr)) {
198 struct reg_window32 win32;
201 if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
203 for (i = 0; i < 8; i++)
204 wbuf->locals[i] = win32.locals[i];
205 for (i = 0; i < 8; i++)
206 wbuf->ins[i] = win32.ins[i];
208 rw_addr += STACK_BIAS;
209 if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
216 static int regwindow64_set(struct task_struct *target,
217 const struct pt_regs *regs,
218 struct reg_window *wbuf)
220 unsigned long rw_addr = regs->u_regs[UREG_I6];
222 if (!test_thread_64bit_stack(rw_addr)) {
223 struct reg_window32 win32;
226 for (i = 0; i < 8; i++)
227 win32.locals[i] = wbuf->locals[i];
228 for (i = 0; i < 8; i++)
229 win32.ins[i] = wbuf->ins[i];
231 if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
234 rw_addr += STACK_BIAS;
235 if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
247 static int genregs64_get(struct task_struct *target,
248 const struct user_regset *regset,
249 unsigned int pos, unsigned int count,
250 void *kbuf, void __user *ubuf)
252 const struct pt_regs *regs = task_pt_regs(target);
255 if (target == current)
258 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
260 0, 16 * sizeof(u64));
261 if (!ret && count && pos < (32 * sizeof(u64))) {
262 struct reg_window window;
264 if (regwindow64_get(target, regs, &window))
266 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
273 /* TSTATE, TPC, TNPC */
274 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
281 unsigned long y = regs->y;
283 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
290 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
291 36 * sizeof(u64), -1);
297 static int genregs64_set(struct task_struct *target,
298 const struct user_regset *regset,
299 unsigned int pos, unsigned int count,
300 const void *kbuf, const void __user *ubuf)
302 struct pt_regs *regs = task_pt_regs(target);
305 if (target == current)
308 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
310 0, 16 * sizeof(u64));
311 if (!ret && count && pos < (32 * sizeof(u64))) {
312 struct reg_window window;
314 if (regwindow64_get(target, regs, &window))
317 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
323 regwindow64_set(target, regs, &window))
327 if (!ret && count > 0) {
328 unsigned long tstate;
331 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
336 /* Only the condition codes and the "in syscall"
337 * state can be modified in the %tstate register.
339 tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
340 regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
341 regs->tstate |= tstate;
347 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
354 unsigned long y = regs->y;
356 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
365 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
366 36 * sizeof(u64), -1);
371 static int fpregs64_get(struct task_struct *target,
372 const struct user_regset *regset,
373 unsigned int pos, unsigned int count,
374 void *kbuf, void __user *ubuf)
376 const unsigned long *fpregs = task_thread_info(target)->fpregs;
377 unsigned long fprs, fsr, gsr;
380 if (target == current)
381 save_and_clear_fpu();
383 fprs = task_thread_info(target)->fpsaved[0];
386 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
388 0, 16 * sizeof(u64));
390 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
396 ret = user_regset_copyout(&pos, &count,
402 ret = user_regset_copyout_zero(&pos, &count,
408 if (fprs & FPRS_FEF) {
409 fsr = task_thread_info(target)->xfsr[0];
410 gsr = task_thread_info(target)->gsr[0];
416 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
421 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
426 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
432 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
433 35 * sizeof(u64), -1);
438 static int fpregs64_set(struct task_struct *target,
439 const struct user_regset *regset,
440 unsigned int pos, unsigned int count,
441 const void *kbuf, const void __user *ubuf)
443 unsigned long *fpregs = task_thread_info(target)->fpregs;
447 if (target == current)
448 save_and_clear_fpu();
450 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
452 0, 32 * sizeof(u64));
454 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
455 task_thread_info(target)->xfsr,
459 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
460 task_thread_info(target)->gsr,
464 fprs = task_thread_info(target)->fpsaved[0];
465 if (!ret && count > 0) {
466 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
472 fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
473 task_thread_info(target)->fpsaved[0] = fprs;
476 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
477 35 * sizeof(u64), -1);
481 static const struct user_regset sparc64_regsets[] = {
487 * TSTATE, TPC, TNPC, Y
490 .core_note_type = NT_PRSTATUS,
492 .size = sizeof(u64), .align = sizeof(u64),
493 .get = genregs64_get, .set = genregs64_set
502 .core_note_type = NT_PRFPREG,
504 .size = sizeof(u64), .align = sizeof(u64),
505 .get = fpregs64_get, .set = fpregs64_set
509 static const struct user_regset_view user_sparc64_view = {
510 .name = "sparc64", .e_machine = EM_SPARCV9,
511 .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
515 static int genregs32_get(struct task_struct *target,
516 const struct user_regset *regset,
517 unsigned int pos, unsigned int count,
518 void *kbuf, void __user *ubuf)
520 const struct pt_regs *regs = task_pt_regs(target);
521 compat_ulong_t __user *reg_window;
522 compat_ulong_t *k = kbuf;
523 compat_ulong_t __user *u = ubuf;
526 if (target == current)
530 count /= sizeof(reg);
533 for (; count > 0 && pos < 16; count--)
534 *k++ = regs->u_regs[pos++];
536 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
538 if (target == current) {
539 for (; count > 0 && pos < 32; count--) {
540 if (get_user(*k++, ®_window[pos++]))
544 for (; count > 0 && pos < 32; count--) {
545 if (access_process_vm(target,
557 for (; count > 0 && pos < 16; count--) {
558 if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
562 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
564 if (target == current) {
565 for (; count > 0 && pos < 32; count--) {
566 if (get_user(reg, ®_window[pos++]) ||
571 for (; count > 0 && pos < 32; count--) {
572 if (access_process_vm(target,
579 if (put_user(reg, u++))
587 reg = tstate_to_psr(regs->tstate);
608 else if (put_user(reg, u++))
615 count *= sizeof(reg);
617 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
618 38 * sizeof(reg), -1);
621 static int genregs32_set(struct task_struct *target,
622 const struct user_regset *regset,
623 unsigned int pos, unsigned int count,
624 const void *kbuf, const void __user *ubuf)
626 struct pt_regs *regs = task_pt_regs(target);
627 compat_ulong_t __user *reg_window;
628 const compat_ulong_t *k = kbuf;
629 const compat_ulong_t __user *u = ubuf;
632 if (target == current)
636 count /= sizeof(reg);
639 for (; count > 0 && pos < 16; count--)
640 regs->u_regs[pos++] = *k++;
642 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
644 if (target == current) {
645 for (; count > 0 && pos < 32; count--) {
646 if (put_user(*k++, ®_window[pos++]))
650 for (; count > 0 && pos < 32; count--) {
651 if (access_process_vm(target,
656 FOLL_FORCE | FOLL_WRITE)
664 for (; count > 0 && pos < 16; count--) {
665 if (get_user(reg, u++))
667 regs->u_regs[pos++] = reg;
670 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
672 if (target == current) {
673 for (; count > 0 && pos < 32; count--) {
674 if (get_user(reg, u++) ||
675 put_user(reg, ®_window[pos++]))
679 for (; count > 0 && pos < 32; count--) {
680 if (get_user(reg, u++))
682 if (access_process_vm(target,
686 FOLL_FORCE | FOLL_WRITE)
695 unsigned long tstate;
699 else if (get_user(reg, u++))
704 tstate = regs->tstate;
705 tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
706 tstate |= psr_to_tstate_icc(reg);
707 if (reg & PSR_SYSCALL)
708 tstate |= TSTATE_SYSCALL;
709 regs->tstate = tstate;
732 count *= sizeof(reg);
734 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
735 38 * sizeof(reg), -1);
738 static int fpregs32_get(struct task_struct *target,
739 const struct user_regset *regset,
740 unsigned int pos, unsigned int count,
741 void *kbuf, void __user *ubuf)
743 const unsigned long *fpregs = task_thread_info(target)->fpregs;
744 compat_ulong_t enabled;
749 if (target == current)
750 save_and_clear_fpu();
752 fprs = task_thread_info(target)->fpsaved[0];
753 if (fprs & FPRS_FEF) {
754 fsr = task_thread_info(target)->xfsr[0];
761 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
763 0, 32 * sizeof(u32));
766 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
770 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
778 val = (enabled << 8) | (8 << 16);
779 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
786 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
787 35 * sizeof(u32), -1);
792 static int fpregs32_set(struct task_struct *target,
793 const struct user_regset *regset,
794 unsigned int pos, unsigned int count,
795 const void *kbuf, const void __user *ubuf)
797 unsigned long *fpregs = task_thread_info(target)->fpregs;
801 if (target == current)
802 save_and_clear_fpu();
804 fprs = task_thread_info(target)->fpsaved[0];
806 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
808 0, 32 * sizeof(u32));
810 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
813 if (!ret && count > 0) {
817 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
822 val = task_thread_info(target)->xfsr[0];
823 val &= 0xffffffff00000000UL;
825 task_thread_info(target)->xfsr[0] = val;
829 fprs |= (FPRS_FEF | FPRS_DL);
830 task_thread_info(target)->fpsaved[0] = fprs;
833 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
834 34 * sizeof(u32), -1);
838 static const struct user_regset sparc32_regsets[] = {
844 * PSR, PC, nPC, Y, WIM, TBR
847 .core_note_type = NT_PRSTATUS,
849 .size = sizeof(u32), .align = sizeof(u32),
850 .get = genregs32_get, .set = genregs32_set
856 * FPU QUEUE COUNT (8-bit char)
857 * FPU QUEUE ENTRYSIZE (8-bit char)
858 * FPU ENABLED (8-bit char)
860 * FPU QUEUE (64 32-bit ints)
863 .core_note_type = NT_PRFPREG,
865 .size = sizeof(u32), .align = sizeof(u32),
866 .get = fpregs32_get, .set = fpregs32_set
870 static const struct user_regset_view user_sparc32_view = {
871 .name = "sparc", .e_machine = EM_SPARC,
872 .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
874 #endif /* CONFIG_COMPAT */
876 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
879 if (test_tsk_thread_flag(task, TIF_32BIT))
880 return &user_sparc32_view;
882 return &user_sparc64_view;
887 unsigned int regs[32];
893 unsigned int insnaddr;
898 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
899 compat_ulong_t caddr, compat_ulong_t cdata)
901 const struct user_regset_view *view = task_user_regset_view(current);
902 compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
903 struct pt_regs32 __user *pregs;
904 struct compat_fps __user *fps;
905 unsigned long addr2 = caddr2;
906 unsigned long addr = caddr;
907 unsigned long data = cdata;
910 pregs = (struct pt_regs32 __user *) addr;
911 fps = (struct compat_fps __user *) addr;
915 ret = (addr != 0) ? -EIO : 0;
919 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
924 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
931 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
936 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
942 case PTRACE_GETFPREGS:
943 ret = copy_regset_to_user(child, view, REGSET_FP,
948 ret = copy_regset_to_user(child, view, REGSET_FP,
953 if (__put_user(0, &fps->flags) ||
954 __put_user(0, &fps->extra) ||
955 __put_user(0, &fps->fpqd) ||
956 clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
961 case PTRACE_SETFPREGS:
962 ret = copy_regset_from_user(child, view, REGSET_FP,
967 ret = copy_regset_from_user(child, view, REGSET_FP,
973 case PTRACE_READTEXT:
974 case PTRACE_READDATA:
975 ret = ptrace_readdata(child, addr,
976 (char __user *)addr2, data);
983 case PTRACE_WRITETEXT:
984 case PTRACE_WRITEDATA:
985 ret = ptrace_writedata(child, (char __user *) addr2,
994 if (request == PTRACE_SPARC_DETACH)
995 request = PTRACE_DETACH;
996 ret = compat_ptrace_request(child, request, addr, data);
1002 #endif /* CONFIG_COMPAT */
1005 unsigned int regs[64];
1009 long arch_ptrace(struct task_struct *child, long request,
1010 unsigned long addr, unsigned long data)
1012 const struct user_regset_view *view = task_user_regset_view(current);
1013 unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
1014 struct pt_regs __user *pregs;
1015 struct fps __user *fps;
1016 void __user *addr2p;
1019 pregs = (struct pt_regs __user *) addr;
1020 fps = (struct fps __user *) addr;
1021 addr2p = (void __user *) addr2;
1024 case PTRACE_PEEKUSR:
1025 ret = (addr != 0) ? -EIO : 0;
1028 case PTRACE_GETREGS64:
1029 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1034 /* XXX doesn't handle 'y' register correctly XXX */
1035 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1042 case PTRACE_SETREGS64:
1043 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1048 /* XXX doesn't handle 'y' register correctly XXX */
1049 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1056 case PTRACE_GETFPREGS64:
1057 ret = copy_regset_to_user(child, view, REGSET_FP,
1063 case PTRACE_SETFPREGS64:
1064 ret = copy_regset_from_user(child, view, REGSET_FP,
1070 case PTRACE_READTEXT:
1071 case PTRACE_READDATA:
1072 ret = ptrace_readdata(child, addr, addr2p, data);
1079 case PTRACE_WRITETEXT:
1080 case PTRACE_WRITEDATA:
1081 ret = ptrace_writedata(child, addr2p, addr, data);
1089 if (request == PTRACE_SPARC_DETACH)
1090 request = PTRACE_DETACH;
1091 ret = ptrace_request(child, request, addr, data);
1098 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1102 /* do the secure computing check first */
1103 secure_computing_strict(regs->u_regs[UREG_G1]);
1105 if (test_thread_flag(TIF_NOHZ))
1108 if (test_thread_flag(TIF_SYSCALL_TRACE))
1109 ret = tracehook_report_syscall_entry(regs);
1111 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1112 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1114 audit_syscall_entry(regs->u_regs[UREG_G1], regs->u_regs[UREG_I0],
1115 regs->u_regs[UREG_I1], regs->u_regs[UREG_I2],
1116 regs->u_regs[UREG_I3]);
1121 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1123 if (test_thread_flag(TIF_NOHZ))
1126 audit_syscall_exit(regs);
1128 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1129 trace_sys_exit(regs, regs->u_regs[UREG_I0]);
1131 if (test_thread_flag(TIF_SYSCALL_TRACE))
1132 tracehook_report_syscall_exit(regs, 0);
1134 if (test_thread_flag(TIF_NOHZ))
1139 * regs_query_register_offset() - query register offset from its name
1140 * @name: the name of a register
1142 * regs_query_register_offset() returns the offset of a register in struct
1143 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
1145 int regs_query_register_offset(const char *name)
1147 const struct pt_regs_offset *roff;
1149 for (roff = regoffset_table; roff->name != NULL; roff++)
1150 if (!strcmp(roff->name, name))
1151 return roff->offset;
1156 * regs_within_kernel_stack() - check the address in the stack
1157 * @regs: pt_regs which contains kernel stack pointer.
1158 * @addr: address which is checked.
1160 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
1161 * If @addr is within the kernel stack, it returns true. If not, returns false.
1163 static inline int regs_within_kernel_stack(struct pt_regs *regs,
1166 unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS;
1167 return ((addr & ~(THREAD_SIZE - 1)) ==
1168 (ksp & ~(THREAD_SIZE - 1)));
1172 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1173 * @regs: pt_regs which contains kernel stack pointer.
1174 * @n: stack entry number.
1176 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1177 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
1180 unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1182 unsigned long ksp = kernel_stack_pointer(regs) + STACK_BIAS;
1183 unsigned long *addr = (unsigned long *)ksp;
1185 if (regs_within_kernel_stack(regs, (unsigned long)addr))