3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 * Derived from "arch/m68k/kernel/ptrace.c"
6 * Copyright (C) 1994 by Hamish Macdonald
7 * Taken from linux/kernel/ptrace.c and modified for M680x0.
8 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
10 * Modified by Cort Dougan (cort@hq.fsmlabs.com)
11 * and Paul Mackerras (paulus@samba.org).
13 * This file is subject to the terms and conditions of the GNU General
14 * Public License. See the file README.legal in the main directory of
15 * this archive for more details.
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
21 #include <linux/smp.h>
22 #include <linux/errno.h>
23 #include <linux/ptrace.h>
24 #include <linux/regset.h>
25 #include <linux/elf.h>
26 #include <linux/user.h>
27 #include <linux/security.h>
28 #include <linux/signal.h>
29 #include <linux/seccomp.h>
30 #include <linux/audit.h>
32 #include <linux/module.h>
35 #include <asm/uaccess.h>
37 #include <asm/pgtable.h>
38 #include <asm/system.h>
41 * does not yet catch signals sent when the child dies.
42 * in exit.c or in signal.c.
46 * Set of msr bits that gdb can change on behalf of a process.
48 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
49 #define MSR_DEBUGCHANGE 0
51 #define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
55 * Max register writeable via put_reg
58 #define PT_MAX_PUT_REG PT_MQ
60 #define PT_MAX_PUT_REG PT_CCR
63 static unsigned long get_user_msr(struct task_struct *task)
65 return task->thread.regs->msr | task->thread.fpexc_mode;
68 static int set_user_msr(struct task_struct *task, unsigned long msr)
70 task->thread.regs->msr &= ~MSR_DEBUGCHANGE;
71 task->thread.regs->msr |= msr & MSR_DEBUGCHANGE;
76 * We prevent mucking around with the reserved area of trap
77 * which are used internally by the kernel.
79 static int set_user_trap(struct task_struct *task, unsigned long trap)
81 task->thread.regs->trap = trap & 0xfff0;
86 * Get contents of register REGNO in task TASK.
88 unsigned long ptrace_get_reg(struct task_struct *task, int regno)
90 if (task->thread.regs == NULL)
94 return get_user_msr(task);
96 if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long)))
97 return ((unsigned long *)task->thread.regs)[regno];
103 * Write contents of register REGNO in task TASK.
105 int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
107 if (task->thread.regs == NULL)
111 return set_user_msr(task, data);
112 if (regno == PT_TRAP)
113 return set_user_trap(task, data);
115 if (regno <= PT_MAX_PUT_REG) {
116 ((unsigned long *)task->thread.regs)[regno] = data;
123 static int fpr_get(struct task_struct *target, const struct user_regset *regset,
124 unsigned int pos, unsigned int count,
125 void *kbuf, void __user *ubuf)
127 flush_fp_to_thread(target);
129 BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
130 offsetof(struct thread_struct, fpr[32]));
132 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
133 &target->thread.fpr, 0, -1);
136 static int fpr_set(struct task_struct *target, const struct user_regset *regset,
137 unsigned int pos, unsigned int count,
138 const void *kbuf, const void __user *ubuf)
140 flush_fp_to_thread(target);
142 BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
143 offsetof(struct thread_struct, fpr[32]));
145 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
146 &target->thread.fpr, 0, -1);
149 static int get_fpregs(void __user *data, struct task_struct *task,
152 unsigned int count = has_fpscr ? 33 : 32;
153 if (!access_ok(VERIFY_WRITE, data, count * sizeof(double)))
155 return fpr_get(task, NULL, 0, count * sizeof(double), NULL, data);
158 static int set_fpregs(void __user *data, struct task_struct *task,
161 unsigned int count = has_fpscr ? 33 : 32;
162 if (!access_ok(VERIFY_READ, data, count * sizeof(double)))
164 return fpr_set(task, NULL, 0, count * sizeof(double), NULL, data);
168 #ifdef CONFIG_ALTIVEC
170 * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go.
171 * The transfer totals 34 quadword. Quadwords 0-31 contain the
172 * corresponding vector registers. Quadword 32 contains the vscr as the
173 * last word (offset 12) within that quadword. Quadword 33 contains the
174 * vrsave as the first word (offset 0) within the quadword.
176 * This definition of the VMX state is compatible with the current PPC32
177 * ptrace interface. This allows signal handling and ptrace to use the
178 * same structures. This also simplifies the implementation of a bi-arch
179 * (combined (32- and 64-bit) gdb.
182 static int vr_active(struct task_struct *target,
183 const struct user_regset *regset)
185 flush_altivec_to_thread(target);
186 return target->thread.used_vr ? regset->n : 0;
189 static int vr_get(struct task_struct *target, const struct user_regset *regset,
190 unsigned int pos, unsigned int count,
191 void *kbuf, void __user *ubuf)
195 flush_altivec_to_thread(target);
197 BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
198 offsetof(struct thread_struct, vr[32]));
200 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
201 &target->thread.vr, 0,
202 33 * sizeof(vector128));
205 * Copy out only the low-order word of vrsave.
211 memset(&vrsave, 0, sizeof(vrsave));
212 vrsave.word = target->thread.vrsave;
213 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &vrsave,
214 33 * sizeof(vector128), -1);
220 static int vr_set(struct task_struct *target, const struct user_regset *regset,
221 unsigned int pos, unsigned int count,
222 const void *kbuf, const void __user *ubuf)
226 flush_altivec_to_thread(target);
228 BUILD_BUG_ON(offsetof(struct thread_struct, vscr) !=
229 offsetof(struct thread_struct, vr[32]));
231 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
232 &target->thread.vr, 0, 33 * sizeof(vector128));
233 if (!ret && count > 0) {
235 * We use only the first word of vrsave.
241 memset(&vrsave, 0, sizeof(vrsave));
242 vrsave.word = target->thread.vrsave;
243 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
244 33 * sizeof(vector128), -1);
246 target->thread.vrsave = vrsave.word;
253 * Get contents of AltiVec register state in task TASK
255 static int get_vrregs(unsigned long __user *data, struct task_struct *task)
257 if (!access_ok(VERIFY_WRITE, data,
258 33 * sizeof(vector128) + sizeof(u32)))
261 return vr_get(task, NULL, 0, 33 * sizeof(vector128) + sizeof(u32),
266 * Write contents of AltiVec register state into task TASK.
268 static int set_vrregs(struct task_struct *task, unsigned long __user *data)
270 if (!access_ok(VERIFY_READ, data, 33 * sizeof(vector128) + sizeof(u32)))
273 return vr_set(task, NULL, 0, 33 * sizeof(vector128) + sizeof(u32),
276 #endif /* CONFIG_ALTIVEC */
281 * For get_evrregs/set_evrregs functions 'data' has the following layout:
290 static int evr_active(struct task_struct *target,
291 const struct user_regset *regset)
293 flush_spe_to_thread(target);
294 return target->thread.used_spe ? regset->n : 0;
297 static int evr_get(struct task_struct *target, const struct user_regset *regset,
298 unsigned int pos, unsigned int count,
299 void *kbuf, void __user *ubuf)
303 flush_spe_to_thread(target);
305 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
307 0, sizeof(target->thread.evr));
309 BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
310 offsetof(struct thread_struct, spefscr));
313 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
315 sizeof(target->thread.evr), -1);
320 static int evr_set(struct task_struct *target, const struct user_regset *regset,
321 unsigned int pos, unsigned int count,
322 const void *kbuf, const void __user *ubuf)
326 flush_spe_to_thread(target);
328 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
330 0, sizeof(target->thread.evr));
332 BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
333 offsetof(struct thread_struct, spefscr));
336 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
338 sizeof(target->thread.evr), -1);
344 * Get contents of SPE register state in task TASK.
346 static int get_evrregs(unsigned long __user *data, struct task_struct *task)
348 if (!access_ok(VERIFY_WRITE, data, 35 * sizeof(u32)))
351 return evr_get(task, NULL, 0, 35 * sizeof(u32), NULL, data);
355 * Write contents of SPE register state into task TASK.
357 static int set_evrregs(struct task_struct *task, unsigned long *data)
359 if (!access_ok(VERIFY_READ, data, 35 * sizeof(u32)))
362 return evr_set(task, NULL, 0, 35 * sizeof(u32), NULL, data);
364 #endif /* CONFIG_SPE */
367 void user_enable_single_step(struct task_struct *task)
369 struct pt_regs *regs = task->thread.regs;
372 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
373 task->thread.dbcr0 = DBCR0_IDM | DBCR0_IC;
379 set_tsk_thread_flag(task, TIF_SINGLESTEP);
382 void user_disable_single_step(struct task_struct *task)
384 struct pt_regs *regs = task->thread.regs;
387 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
388 task->thread.dbcr0 = 0;
389 regs->msr &= ~MSR_DE;
391 regs->msr &= ~MSR_SE;
394 clear_tsk_thread_flag(task, TIF_SINGLESTEP);
397 static int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
400 /* We only support one DABR and no IABRS at the moment */
404 /* The bottom 3 bits are flags */
405 if ((data & ~0x7UL) >= TASK_SIZE)
408 /* Ensure translation is on */
409 if (data && !(data & DABR_TRANSLATION))
412 task->thread.dabr = data;
417 * Called by kernel/ptrace.c when detaching..
419 * Make sure single step bits etc are not set.
421 void ptrace_disable(struct task_struct *child)
423 /* make sure the single step bit is not set. */
424 user_disable_single_step(child);
428 * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
429 * we mark them as obsolete now, they will be removed in a future version
431 static long arch_ptrace_old(struct task_struct *child, long request, long addr,
437 case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
439 unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
440 unsigned long __user *tmp = (unsigned long __user *)addr;
442 CHECK_FULL_REGS(child->thread.regs);
443 for (i = 0; i < 32; i++) {
444 ret = put_user(*reg, tmp);
453 case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
455 unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
456 unsigned long __user *tmp = (unsigned long __user *)addr;
458 CHECK_FULL_REGS(child->thread.regs);
459 for (i = 0; i < 32; i++) {
460 ret = get_user(*reg, tmp);
469 case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
470 flush_fp_to_thread(child);
471 ret = get_fpregs((void __user *)addr, child, 0);
475 case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
476 flush_fp_to_thread(child);
477 ret = set_fpregs((void __user *)addr, child, 0);
485 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
490 /* when I and D space are separate, these will need to be fixed. */
491 case PTRACE_PEEKTEXT: /* read word at location addr. */
492 case PTRACE_PEEKDATA:
493 ret = generic_ptrace_peekdata(child, addr, data);
496 /* read the word at location addr in the USER area. */
497 case PTRACE_PEEKUSR: {
498 unsigned long index, tmp;
501 /* convert to index and check */
503 index = (unsigned long) addr >> 2;
504 if ((addr & 3) || (index > PT_FPSCR)
505 || (child->thread.regs == NULL))
507 index = (unsigned long) addr >> 3;
508 if ((addr & 7) || (index > PT_FPSCR))
512 CHECK_FULL_REGS(child->thread.regs);
513 if (index < PT_FPR0) {
514 tmp = ptrace_get_reg(child, (int) index);
516 flush_fp_to_thread(child);
517 tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0];
519 ret = put_user(tmp,(unsigned long __user *) data);
523 /* If I and D space are separate, this will have to be fixed. */
524 case PTRACE_POKETEXT: /* write the word at location addr. */
525 case PTRACE_POKEDATA:
526 ret = generic_ptrace_pokedata(child, addr, data);
529 /* write the word at location addr in the USER area */
530 case PTRACE_POKEUSR: {
534 /* convert to index and check */
536 index = (unsigned long) addr >> 2;
537 if ((addr & 3) || (index > PT_FPSCR)
538 || (child->thread.regs == NULL))
540 index = (unsigned long) addr >> 3;
541 if ((addr & 7) || (index > PT_FPSCR))
545 CHECK_FULL_REGS(child->thread.regs);
546 if (index < PT_FPR0) {
547 ret = ptrace_put_reg(child, index, data);
549 flush_fp_to_thread(child);
550 ((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data;
556 case PTRACE_GET_DEBUGREG: {
558 /* We only support one DABR and no IABRS at the moment */
561 ret = put_user(child->thread.dabr,
562 (unsigned long __user *)data);
566 case PTRACE_SET_DEBUGREG:
567 ret = ptrace_set_debugreg(child, addr, data);
571 case PTRACE_GETREGS64:
573 case PTRACE_GETREGS: { /* Get all pt_regs from the child. */
575 if (!access_ok(VERIFY_WRITE, (void __user *)data,
576 sizeof(struct pt_regs))) {
580 CHECK_FULL_REGS(child->thread.regs);
582 for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
583 ret |= __put_user(ptrace_get_reg(child, ui),
584 (unsigned long __user *) data);
585 data += sizeof(long);
591 case PTRACE_SETREGS64:
593 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
596 if (!access_ok(VERIFY_READ, (void __user *)data,
597 sizeof(struct pt_regs))) {
601 CHECK_FULL_REGS(child->thread.regs);
603 for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
604 ret = __get_user(tmp, (unsigned long __user *) data);
607 ptrace_put_reg(child, ui, tmp);
608 data += sizeof(long);
613 case PTRACE_GETFPREGS: { /* Get the child FPU state (FPR0...31 + FPSCR) */
614 flush_fp_to_thread(child);
615 ret = get_fpregs((void __user *)data, child, 1);
619 case PTRACE_SETFPREGS: { /* Set the child FPU state (FPR0...31 + FPSCR) */
620 flush_fp_to_thread(child);
621 ret = set_fpregs((void __user *)data, child, 1);
625 #ifdef CONFIG_ALTIVEC
626 case PTRACE_GETVRREGS:
627 /* Get the child altivec register state. */
628 flush_altivec_to_thread(child);
629 ret = get_vrregs((unsigned long __user *)data, child);
632 case PTRACE_SETVRREGS:
633 /* Set the child altivec register state. */
634 flush_altivec_to_thread(child);
635 ret = set_vrregs(child, (unsigned long __user *)data);
639 case PTRACE_GETEVRREGS:
640 /* Get the child spe register state. */
641 flush_spe_to_thread(child);
642 ret = get_evrregs((unsigned long __user *)data, child);
645 case PTRACE_SETEVRREGS:
646 /* Set the child spe register state. */
647 /* this is to clear the MSR_SPE bit to force a reload
648 * of register state from memory */
649 flush_spe_to_thread(child);
650 ret = set_evrregs(child, (unsigned long __user *)data);
654 /* Old reverse args ptrace callss */
655 case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
656 case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
657 case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */
658 case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */
659 ret = arch_ptrace_old(child, request, addr, data);
663 ret = ptrace_request(child, request, addr, data);
669 static void do_syscall_trace(void)
671 /* the 0x80 provides a way for the tracing parent to distinguish
672 between a syscall stop and SIGTRAP delivery */
673 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
677 * this isn't the same as continuing with a signal, but it will do
678 * for normal use. strace only continues with a signal if the
679 * stopping signal is not SIGTRAP. -brl
681 if (current->exit_code) {
682 send_sig(current->exit_code, current, 1);
683 current->exit_code = 0;
687 void do_syscall_trace_enter(struct pt_regs *regs)
689 secure_computing(regs->gpr[0]);
691 if (test_thread_flag(TIF_SYSCALL_TRACE)
692 && (current->ptrace & PT_PTRACED))
695 if (unlikely(current->audit_context)) {
697 if (!test_thread_flag(TIF_32BIT))
698 audit_syscall_entry(AUDIT_ARCH_PPC64,
700 regs->gpr[3], regs->gpr[4],
701 regs->gpr[5], regs->gpr[6]);
704 audit_syscall_entry(AUDIT_ARCH_PPC,
706 regs->gpr[3] & 0xffffffff,
707 regs->gpr[4] & 0xffffffff,
708 regs->gpr[5] & 0xffffffff,
709 regs->gpr[6] & 0xffffffff);
713 void do_syscall_trace_leave(struct pt_regs *regs)
715 if (unlikely(current->audit_context))
716 audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS,
719 if ((test_thread_flag(TIF_SYSCALL_TRACE)
720 || test_thread_flag(TIF_SINGLESTEP))
721 && (current->ptrace & PT_PTRACED))