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/ptrace.h>
18 #include <linux/user.h>
19 #include <linux/smp.h>
20 #include <linux/security.h>
21 #include <linux/seccomp.h>
22 #include <linux/audit.h>
23 #include <linux/signal.h>
24 #include <linux/regset.h>
25 #include <linux/tracehook.h>
26 #include <trace/syscall.h>
27 #include <linux/compat.h>
28 #include <linux/elf.h>
31 #include <asm/pgtable.h>
32 #include <asm/system.h>
33 #include <asm/uaccess.h>
34 #include <asm/psrcompat.h>
35 #include <asm/visasm.h>
36 #include <asm/spitfire.h>
38 #include <asm/cpudata.h>
39 #include <asm/cacheflush.h>
41 #define CREATE_TRACE_POINTS
42 #include <trace/events/syscalls.h>
46 /* #define ALLOW_INIT_TRACING */
49 * Called by kernel/ptrace.c when detaching..
51 * Make sure single step bits etc are not set.
53 void ptrace_disable(struct task_struct *child)
58 /* To get the necessary page struct, access_process_vm() first calls
59 * get_user_pages(). This has done a flush_dcache_page() on the
60 * accessed page. Then our caller (copy_{to,from}_user_page()) did
61 * to memcpy to read/write the data from that page.
63 * Now, the only thing we have to do is:
64 * 1) flush the D-cache if it's possible than an illegal alias
66 * 2) flush the I-cache if this is pre-cheetah and we did a write
68 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
69 unsigned long uaddr, void *kaddr,
70 unsigned long len, int write)
72 BUG_ON(len > PAGE_SIZE);
74 if (tlb_type == hypervisor)
79 #ifdef DCACHE_ALIASING_POSSIBLE
80 /* If bit 13 of the kernel address we used to access the
81 * user page is the same as the virtual address that page
82 * is mapped to in the user's address space, we can skip the
85 if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
86 unsigned long start = __pa(kaddr);
87 unsigned long end = start + len;
88 unsigned long dcache_line_size;
90 dcache_line_size = local_cpu_data().dcache_line_size;
92 if (tlb_type == spitfire) {
93 for (; start < end; start += dcache_line_size)
94 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
96 start &= ~(dcache_line_size - 1);
97 for (; start < end; start += dcache_line_size)
99 "stxa %%g0, [%0] %1\n\t"
103 "i" (ASI_DCACHE_INVALIDATE));
107 if (write && tlb_type == spitfire) {
108 unsigned long start = (unsigned long) kaddr;
109 unsigned long end = start + len;
110 unsigned long icache_line_size;
112 icache_line_size = local_cpu_data().icache_line_size;
114 for (; start < end; start += icache_line_size)
121 static int get_from_target(struct task_struct *target, unsigned long uaddr,
124 if (target == current) {
125 if (copy_from_user(kbuf, (void __user *) uaddr, len))
128 int len2 = access_process_vm(target, uaddr, kbuf, len, 0);
135 static int set_to_target(struct task_struct *target, unsigned long uaddr,
138 if (target == current) {
139 if (copy_to_user((void __user *) uaddr, kbuf, len))
142 int len2 = access_process_vm(target, uaddr, kbuf, len, 1);
149 static int regwindow64_get(struct task_struct *target,
150 const struct pt_regs *regs,
151 struct reg_window *wbuf)
153 unsigned long rw_addr = regs->u_regs[UREG_I6];
155 if (test_tsk_thread_flag(current, TIF_32BIT)) {
156 struct reg_window32 win32;
159 if (get_from_target(target, rw_addr, &win32, sizeof(win32)))
161 for (i = 0; i < 8; i++)
162 wbuf->locals[i] = win32.locals[i];
163 for (i = 0; i < 8; i++)
164 wbuf->ins[i] = win32.ins[i];
166 rw_addr += STACK_BIAS;
167 if (get_from_target(target, rw_addr, wbuf, sizeof(*wbuf)))
174 static int regwindow64_set(struct task_struct *target,
175 const struct pt_regs *regs,
176 struct reg_window *wbuf)
178 unsigned long rw_addr = regs->u_regs[UREG_I6];
180 if (test_tsk_thread_flag(current, TIF_32BIT)) {
181 struct reg_window32 win32;
184 for (i = 0; i < 8; i++)
185 win32.locals[i] = wbuf->locals[i];
186 for (i = 0; i < 8; i++)
187 win32.ins[i] = wbuf->ins[i];
189 if (set_to_target(target, rw_addr, &win32, sizeof(win32)))
192 rw_addr += STACK_BIAS;
193 if (set_to_target(target, rw_addr, wbuf, sizeof(*wbuf)))
205 static int genregs64_get(struct task_struct *target,
206 const struct user_regset *regset,
207 unsigned int pos, unsigned int count,
208 void *kbuf, void __user *ubuf)
210 const struct pt_regs *regs = task_pt_regs(target);
213 if (target == current)
216 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
218 0, 16 * sizeof(u64));
219 if (!ret && count && pos < (32 * sizeof(u64))) {
220 struct reg_window window;
222 if (regwindow64_get(target, regs, &window))
224 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
231 /* TSTATE, TPC, TNPC */
232 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
239 unsigned long y = regs->y;
241 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
248 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
249 36 * sizeof(u64), -1);
255 static int genregs64_set(struct task_struct *target,
256 const struct user_regset *regset,
257 unsigned int pos, unsigned int count,
258 const void *kbuf, const void __user *ubuf)
260 struct pt_regs *regs = task_pt_regs(target);
263 if (target == current)
266 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
268 0, 16 * sizeof(u64));
269 if (!ret && count && pos < (32 * sizeof(u64))) {
270 struct reg_window window;
272 if (regwindow64_get(target, regs, &window))
275 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
281 regwindow64_set(target, regs, &window))
285 if (!ret && count > 0) {
286 unsigned long tstate;
289 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
294 /* Only the condition codes and the "in syscall"
295 * state can be modified in the %tstate register.
297 tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
298 regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
299 regs->tstate |= tstate;
305 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
314 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
323 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
324 36 * sizeof(u64), -1);
329 static int fpregs64_get(struct task_struct *target,
330 const struct user_regset *regset,
331 unsigned int pos, unsigned int count,
332 void *kbuf, void __user *ubuf)
334 const unsigned long *fpregs = task_thread_info(target)->fpregs;
335 unsigned long fprs, fsr, gsr;
338 if (target == current)
339 save_and_clear_fpu();
341 fprs = task_thread_info(target)->fpsaved[0];
344 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
346 0, 16 * sizeof(u64));
348 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
354 ret = user_regset_copyout(&pos, &count,
360 ret = user_regset_copyout_zero(&pos, &count,
366 if (fprs & FPRS_FEF) {
367 fsr = task_thread_info(target)->xfsr[0];
368 gsr = task_thread_info(target)->gsr[0];
374 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
379 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
384 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
390 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
391 35 * sizeof(u64), -1);
396 static int fpregs64_set(struct task_struct *target,
397 const struct user_regset *regset,
398 unsigned int pos, unsigned int count,
399 const void *kbuf, const void __user *ubuf)
401 unsigned long *fpregs = task_thread_info(target)->fpregs;
405 if (target == current)
406 save_and_clear_fpu();
408 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
410 0, 32 * sizeof(u64));
412 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
413 task_thread_info(target)->xfsr,
417 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
418 task_thread_info(target)->gsr,
422 fprs = task_thread_info(target)->fpsaved[0];
423 if (!ret && count > 0) {
424 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
430 fprs |= (FPRS_FEF | FPRS_DL | FPRS_DU);
431 task_thread_info(target)->fpsaved[0] = fprs;
434 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
435 35 * sizeof(u64), -1);
439 static const struct user_regset sparc64_regsets[] = {
445 * TSTATE, TPC, TNPC, Y
448 .core_note_type = NT_PRSTATUS,
450 .size = sizeof(u64), .align = sizeof(u64),
451 .get = genregs64_get, .set = genregs64_set
460 .core_note_type = NT_PRFPREG,
462 .size = sizeof(u64), .align = sizeof(u64),
463 .get = fpregs64_get, .set = fpregs64_set
467 static const struct user_regset_view user_sparc64_view = {
468 .name = "sparc64", .e_machine = EM_SPARCV9,
469 .regsets = sparc64_regsets, .n = ARRAY_SIZE(sparc64_regsets)
473 static int genregs32_get(struct task_struct *target,
474 const struct user_regset *regset,
475 unsigned int pos, unsigned int count,
476 void *kbuf, void __user *ubuf)
478 const struct pt_regs *regs = task_pt_regs(target);
479 compat_ulong_t __user *reg_window;
480 compat_ulong_t *k = kbuf;
481 compat_ulong_t __user *u = ubuf;
484 if (target == current)
488 count /= sizeof(reg);
491 for (; count > 0 && pos < 16; count--)
492 *k++ = regs->u_regs[pos++];
494 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
496 if (target == current) {
497 for (; count > 0 && pos < 32; count--) {
498 if (get_user(*k++, ®_window[pos++]))
502 for (; count > 0 && pos < 32; count--) {
503 if (access_process_vm(target,
514 for (; count > 0 && pos < 16; count--) {
515 if (put_user((compat_ulong_t) regs->u_regs[pos++], u++))
519 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
521 if (target == current) {
522 for (; count > 0 && pos < 32; count--) {
523 if (get_user(reg, ®_window[pos++]) ||
528 for (; count > 0 && pos < 32; count--) {
529 if (access_process_vm(target,
532 ®, sizeof(reg), 0)
535 if (access_process_vm(target,
537 ®, sizeof(reg), 1)
548 reg = tstate_to_psr(regs->tstate);
569 else if (put_user(reg, u++))
576 count *= sizeof(reg);
578 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
579 38 * sizeof(reg), -1);
582 static int genregs32_set(struct task_struct *target,
583 const struct user_regset *regset,
584 unsigned int pos, unsigned int count,
585 const void *kbuf, const void __user *ubuf)
587 struct pt_regs *regs = task_pt_regs(target);
588 compat_ulong_t __user *reg_window;
589 const compat_ulong_t *k = kbuf;
590 const compat_ulong_t __user *u = ubuf;
593 if (target == current)
597 count /= sizeof(reg);
600 for (; count > 0 && pos < 16; count--)
601 regs->u_regs[pos++] = *k++;
603 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
605 if (target == current) {
606 for (; count > 0 && pos < 32; count--) {
607 if (put_user(*k++, ®_window[pos++]))
611 for (; count > 0 && pos < 32; count--) {
612 if (access_process_vm(target,
624 for (; count > 0 && pos < 16; count--) {
625 if (get_user(reg, u++))
627 regs->u_regs[pos++] = reg;
630 reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
632 if (target == current) {
633 for (; count > 0 && pos < 32; count--) {
634 if (get_user(reg, u++) ||
635 put_user(reg, ®_window[pos++]))
639 for (; count > 0 && pos < 32; count--) {
640 if (access_process_vm(target,
643 ®, sizeof(reg), 0)
646 if (access_process_vm(target,
649 ®, sizeof(reg), 1)
658 unsigned long tstate;
662 else if (get_user(reg, u++))
667 tstate = regs->tstate;
668 tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
669 tstate |= psr_to_tstate_icc(reg);
670 if (reg & PSR_SYSCALL)
671 tstate |= TSTATE_SYSCALL;
672 regs->tstate = tstate;
695 count *= sizeof(reg);
697 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
698 38 * sizeof(reg), -1);
701 static int fpregs32_get(struct task_struct *target,
702 const struct user_regset *regset,
703 unsigned int pos, unsigned int count,
704 void *kbuf, void __user *ubuf)
706 const unsigned long *fpregs = task_thread_info(target)->fpregs;
707 compat_ulong_t enabled;
712 if (target == current)
713 save_and_clear_fpu();
715 fprs = task_thread_info(target)->fpsaved[0];
716 if (fprs & FPRS_FEF) {
717 fsr = task_thread_info(target)->xfsr[0];
724 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
726 0, 32 * sizeof(u32));
729 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
733 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
741 val = (enabled << 8) | (8 << 16);
742 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
749 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
750 35 * sizeof(u32), -1);
755 static int fpregs32_set(struct task_struct *target,
756 const struct user_regset *regset,
757 unsigned int pos, unsigned int count,
758 const void *kbuf, const void __user *ubuf)
760 unsigned long *fpregs = task_thread_info(target)->fpregs;
764 if (target == current)
765 save_and_clear_fpu();
767 fprs = task_thread_info(target)->fpsaved[0];
769 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
771 0, 32 * sizeof(u32));
773 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
776 if (!ret && count > 0) {
780 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
785 val = task_thread_info(target)->xfsr[0];
786 val &= 0xffffffff00000000UL;
788 task_thread_info(target)->xfsr[0] = val;
792 fprs |= (FPRS_FEF | FPRS_DL);
793 task_thread_info(target)->fpsaved[0] = fprs;
796 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
797 34 * sizeof(u32), -1);
801 static const struct user_regset sparc32_regsets[] = {
807 * PSR, PC, nPC, Y, WIM, TBR
810 .core_note_type = NT_PRSTATUS,
812 .size = sizeof(u32), .align = sizeof(u32),
813 .get = genregs32_get, .set = genregs32_set
819 * FPU QUEUE COUNT (8-bit char)
820 * FPU QUEUE ENTRYSIZE (8-bit char)
821 * FPU ENABLED (8-bit char)
823 * FPU QUEUE (64 32-bit ints)
826 .core_note_type = NT_PRFPREG,
828 .size = sizeof(u32), .align = sizeof(u32),
829 .get = fpregs32_get, .set = fpregs32_set
833 static const struct user_regset_view user_sparc32_view = {
834 .name = "sparc", .e_machine = EM_SPARC,
835 .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
837 #endif /* CONFIG_COMPAT */
839 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
842 if (test_tsk_thread_flag(task, TIF_32BIT))
843 return &user_sparc32_view;
845 return &user_sparc64_view;
850 unsigned int regs[32];
856 unsigned int insnaddr;
861 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
862 compat_ulong_t caddr, compat_ulong_t cdata)
864 const struct user_regset_view *view = task_user_regset_view(current);
865 compat_ulong_t caddr2 = task_pt_regs(current)->u_regs[UREG_I4];
866 struct pt_regs32 __user *pregs;
867 struct compat_fps __user *fps;
868 unsigned long addr2 = caddr2;
869 unsigned long addr = caddr;
870 unsigned long data = cdata;
873 pregs = (struct pt_regs32 __user *) addr;
874 fps = (struct compat_fps __user *) addr;
878 ret = (addr != 0) ? -EIO : 0;
882 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
887 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
894 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
899 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
905 case PTRACE_GETFPREGS:
906 ret = copy_regset_to_user(child, view, REGSET_FP,
911 ret = copy_regset_to_user(child, view, REGSET_FP,
916 if (__put_user(0, &fps->flags) ||
917 __put_user(0, &fps->extra) ||
918 __put_user(0, &fps->fpqd) ||
919 clear_user(&fps->fpq[0], 32 * sizeof(unsigned int)))
924 case PTRACE_SETFPREGS:
925 ret = copy_regset_from_user(child, view, REGSET_FP,
930 ret = copy_regset_from_user(child, view, REGSET_FP,
936 case PTRACE_READTEXT:
937 case PTRACE_READDATA:
938 ret = ptrace_readdata(child, addr,
939 (char __user *)addr2, data);
946 case PTRACE_WRITETEXT:
947 case PTRACE_WRITEDATA:
948 ret = ptrace_writedata(child, (char __user *) addr2,
957 if (request == PTRACE_SPARC_DETACH)
958 request = PTRACE_DETACH;
959 ret = compat_ptrace_request(child, request, addr, data);
965 #endif /* CONFIG_COMPAT */
968 unsigned int regs[64];
972 long arch_ptrace(struct task_struct *child, long request,
973 unsigned long addr, unsigned long data)
975 const struct user_regset_view *view = task_user_regset_view(current);
976 unsigned long addr2 = task_pt_regs(current)->u_regs[UREG_I4];
977 struct pt_regs __user *pregs;
978 struct fps __user *fps;
982 pregs = (struct pt_regs __user *) addr;
983 fps = (struct fps __user *) addr;
984 addr2p = (void __user *) addr2;
988 ret = (addr != 0) ? -EIO : 0;
991 case PTRACE_GETREGS64:
992 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
997 /* XXX doesn't handle 'y' register correctly XXX */
998 ret = copy_regset_to_user(child, view, REGSET_GENERAL,
1005 case PTRACE_SETREGS64:
1006 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1011 /* XXX doesn't handle 'y' register correctly XXX */
1012 ret = copy_regset_from_user(child, view, REGSET_GENERAL,
1019 case PTRACE_GETFPREGS64:
1020 ret = copy_regset_to_user(child, view, REGSET_FP,
1026 case PTRACE_SETFPREGS64:
1027 ret = copy_regset_from_user(child, view, REGSET_FP,
1033 case PTRACE_READTEXT:
1034 case PTRACE_READDATA:
1035 ret = ptrace_readdata(child, addr, addr2p, data);
1042 case PTRACE_WRITETEXT:
1043 case PTRACE_WRITEDATA:
1044 ret = ptrace_writedata(child, addr2p, addr, data);
1052 if (request == PTRACE_SPARC_DETACH)
1053 request = PTRACE_DETACH;
1054 ret = ptrace_request(child, request, addr, data);
1061 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
1065 /* do the secure computing check first */
1066 secure_computing(regs->u_regs[UREG_G1]);
1068 if (test_thread_flag(TIF_SYSCALL_TRACE))
1069 ret = tracehook_report_syscall_entry(regs);
1071 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1072 trace_sys_enter(regs, regs->u_regs[UREG_G1]);
1074 if (unlikely(current->audit_context) && !ret)
1075 audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
1077 AUDIT_ARCH_SPARC64),
1078 regs->u_regs[UREG_G1],
1079 regs->u_regs[UREG_I0],
1080 regs->u_regs[UREG_I1],
1081 regs->u_regs[UREG_I2],
1082 regs->u_regs[UREG_I3]);
1087 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1089 #ifdef CONFIG_AUDITSYSCALL
1090 if (unlikely(current->audit_context)) {
1091 unsigned long tstate = regs->tstate;
1092 int result = AUDITSC_SUCCESS;
1094 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
1095 result = AUDITSC_FAILURE;
1097 audit_syscall_exit(result, regs->u_regs[UREG_I0]);
1100 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1101 trace_sys_exit(regs, regs->u_regs[UREG_G1]);
1103 if (test_thread_flag(TIF_SYSCALL_TRACE))
1104 tracehook_report_syscall_exit(regs, 0);