2 * arch/sh/kernel/ptrace_64.c
4 * Copyright (C) 2000, 2001 Paolo Alberelli
5 * Copyright (C) 2003 - 2008 Paul Mundt
7 * Started from SH3/4 version:
8 * SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
10 * Original x86 implementation:
11 * By Ross Biro 1/23/92
12 * edited by Linus Torvalds
14 * This file is subject to the terms and conditions of the GNU General Public
15 * License. See the file "COPYING" in the main directory of this archive
18 #include <linux/kernel.h>
19 #include <linux/rwsem.h>
20 #include <linux/sched.h>
22 #include <linux/smp.h>
23 #include <linux/smp_lock.h>
24 #include <linux/errno.h>
25 #include <linux/ptrace.h>
26 #include <linux/user.h>
27 #include <linux/signal.h>
28 #include <linux/syscalls.h>
29 #include <linux/audit.h>
30 #include <linux/seccomp.h>
31 #include <linux/tracehook.h>
32 #include <linux/elf.h>
33 #include <linux/regset.h>
35 #include <asm/uaccess.h>
36 #include <asm/pgtable.h>
37 #include <asm/system.h>
38 #include <asm/processor.h>
39 #include <asm/mmu_context.h>
40 #include <asm/syscalls.h>
43 #define CREATE_TRACE_POINTS
44 #include <trace/events/syscalls.h>
46 /* This mask defines the bits of the SR which the user is not allowed to
47 change, which are everything except S, Q, M, PR, SZ, FR. */
48 #define SR_MASK (0xffff8cfd)
51 * does not yet catch signals sent when the child dies.
52 * in exit.c or in signal.c.
56 * This routine will get a word from the user area in the process kernel stack.
58 static inline int get_stack_long(struct task_struct *task, int offset)
62 stack = (unsigned char *)(task->thread.uregs);
64 return (*((int *)stack));
67 static inline unsigned long
68 get_fpu_long(struct task_struct *task, unsigned long addr)
72 regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
74 if (!tsk_used_math(task)) {
75 if (addr == offsetof(struct user_fpu_struct, fpscr)) {
78 tmp = 0xffffffffUL; /* matches initial value in fpu.c */
83 if (last_task_used_math == task) {
87 last_task_used_math = 0;
91 tmp = ((long *)task->thread.xstate)[addr / sizeof(unsigned long)];
96 * This routine will put a word into the user area in the process kernel stack.
98 static inline int put_stack_long(struct task_struct *task, int offset,
101 unsigned char *stack;
103 stack = (unsigned char *)(task->thread.uregs);
105 *(unsigned long *) stack = data;
110 put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
112 struct pt_regs *regs;
114 regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
116 if (!tsk_used_math(task)) {
118 } else if (last_task_used_math == task) {
122 last_task_used_math = 0;
126 ((long *)task->thread.xstate)[addr / sizeof(unsigned long)] = data;
130 void user_enable_single_step(struct task_struct *child)
132 struct pt_regs *regs = child->thread.uregs;
134 regs->sr |= SR_SSTEP; /* auto-resetting upon exception */
136 set_tsk_thread_flag(child, TIF_SINGLESTEP);
139 void user_disable_single_step(struct task_struct *child)
141 struct pt_regs *regs = child->thread.uregs;
143 regs->sr &= ~SR_SSTEP;
145 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
148 static int genregs_get(struct task_struct *target,
149 const struct user_regset *regset,
150 unsigned int pos, unsigned int count,
151 void *kbuf, void __user *ubuf)
153 const struct pt_regs *regs = task_pt_regs(target);
156 /* PC, SR, SYSCALL */
157 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
159 0, 3 * sizeof(unsigned long long));
163 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
165 offsetof(struct pt_regs, regs[0]),
166 63 * sizeof(unsigned long long));
169 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
171 offsetof(struct pt_regs, tregs[0]),
172 8 * sizeof(unsigned long long));
175 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
176 sizeof(struct pt_regs), -1);
181 static int genregs_set(struct task_struct *target,
182 const struct user_regset *regset,
183 unsigned int pos, unsigned int count,
184 const void *kbuf, const void __user *ubuf)
186 struct pt_regs *regs = task_pt_regs(target);
189 /* PC, SR, SYSCALL */
190 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
192 0, 3 * sizeof(unsigned long long));
195 if (!ret && count > 0)
196 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
198 offsetof(struct pt_regs, regs[0]),
199 63 * sizeof(unsigned long long));
202 if (!ret && count > 0)
203 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
205 offsetof(struct pt_regs, tregs[0]),
206 8 * sizeof(unsigned long long));
209 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
210 sizeof(struct pt_regs), -1);
216 int fpregs_get(struct task_struct *target,
217 const struct user_regset *regset,
218 unsigned int pos, unsigned int count,
219 void *kbuf, void __user *ubuf)
223 ret = init_fpu(target);
227 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
228 &target->thread.xstate->hardfpu, 0, -1);
231 static int fpregs_set(struct task_struct *target,
232 const struct user_regset *regset,
233 unsigned int pos, unsigned int count,
234 const void *kbuf, const void __user *ubuf)
238 ret = init_fpu(target);
242 set_stopped_child_used_math(target);
244 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
245 &target->thread.xstate->hardfpu, 0, -1);
248 static int fpregs_active(struct task_struct *target,
249 const struct user_regset *regset)
251 return tsk_used_math(target) ? regset->n : 0;
256 * These are our native regset flavours.
265 static const struct user_regset sh_regsets[] = {
273 .core_note_type = NT_PRSTATUS,
275 .size = sizeof(long long),
276 .align = sizeof(long long),
283 .core_note_type = NT_PRFPREG,
284 .n = sizeof(struct user_fpu_struct) /
286 .size = sizeof(long long),
287 .align = sizeof(long long),
290 .active = fpregs_active,
295 static const struct user_regset_view user_sh64_native_view = {
298 .regsets = sh_regsets,
299 .n = ARRAY_SIZE(sh_regsets),
302 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
304 return &user_sh64_native_view;
307 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
312 /* read the word at location addr in the USER area. */
313 case PTRACE_PEEKUSR: {
317 if ((addr & 3) || addr < 0)
320 if (addr < sizeof(struct pt_regs))
321 tmp = get_stack_long(child, addr);
322 else if ((addr >= offsetof(struct user, fpu)) &&
323 (addr < offsetof(struct user, u_fpvalid))) {
324 tmp = get_fpu_long(child, addr - offsetof(struct user, fpu));
325 } else if (addr == offsetof(struct user, u_fpvalid)) {
326 tmp = !!tsk_used_math(child);
330 ret = put_user(tmp, (unsigned long *)data);
335 /* write the word at location addr in the USER area. We must
336 disallow any changes to certain SR bits or u_fpvalid, since
337 this could crash the kernel or result in a security
340 if ((addr & 3) || addr < 0)
343 if (addr < sizeof(struct pt_regs)) {
344 /* Ignore change of top 32 bits of SR */
345 if (addr == offsetof (struct pt_regs, sr)+4)
350 /* If lower 32 bits of SR, ignore non-user bits */
351 if (addr == offsetof (struct pt_regs, sr))
353 long cursr = get_stack_long(child, addr);
355 data |= (cursr & SR_MASK);
357 ret = put_stack_long(child, addr, data);
359 else if ((addr >= offsetof(struct user, fpu)) &&
360 (addr < offsetof(struct user, u_fpvalid))) {
361 ret = put_fpu_long(child, addr - offsetof(struct user, fpu), data);
366 return copy_regset_to_user(child, &user_sh64_native_view,
368 0, sizeof(struct pt_regs),
369 (void __user *)data);
371 return copy_regset_from_user(child, &user_sh64_native_view,
373 0, sizeof(struct pt_regs),
374 (const void __user *)data);
376 case PTRACE_GETFPREGS:
377 return copy_regset_to_user(child, &user_sh64_native_view,
379 0, sizeof(struct user_fpu_struct),
380 (void __user *)data);
381 case PTRACE_SETFPREGS:
382 return copy_regset_from_user(child, &user_sh64_native_view,
384 0, sizeof(struct user_fpu_struct),
385 (const void __user *)data);
388 ret = ptrace_request(child, request, addr, data);
395 asmlinkage int sh64_ptrace(long request, long pid, long addr, long data)
397 #define WPC_DBRMODE 0x0d104008
398 static int first_call = 1;
402 /* Set WPC.DBRMODE to 0. This makes all debug events get
403 * delivered through RESVEC, i.e. into the handlers in entry.S.
404 * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
405 * would normally be left set to 1, which makes debug events get
406 * delivered through DBRVEC, i.e. into the remote gdb's
407 * handlers. This prevents ptrace getting them, and confuses
408 * the remote gdb.) */
409 printk("DBRMODE set to 0 to permit native debugging\n");
410 poke_real_address_q(WPC_DBRMODE, 0);
415 return sys_ptrace(request, pid, addr, data);
418 static inline int audit_arch(void)
423 arch |= __AUDIT_ARCH_64BIT;
425 #ifdef CONFIG_CPU_LITTLE_ENDIAN
426 arch |= __AUDIT_ARCH_LE;
432 asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs)
436 secure_computing(regs->regs[9]);
438 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
439 tracehook_report_syscall_entry(regs))
441 * Tracing decided this syscall should not happen.
442 * We'll return a bogus call number to get an ENOSYS
443 * error, but leave the original number in regs->regs[0].
447 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
448 trace_sys_enter(regs, regs->regs[9]);
450 if (unlikely(current->audit_context))
451 audit_syscall_entry(audit_arch(), regs->regs[1],
452 regs->regs[2], regs->regs[3],
453 regs->regs[4], regs->regs[5]);
455 return ret ?: regs->regs[9];
458 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
462 if (unlikely(current->audit_context))
463 audit_syscall_exit(AUDITSC_RESULT(regs->regs[9]),
466 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
467 trace_sys_exit(regs, regs->regs[9]);
469 step = test_thread_flag(TIF_SINGLESTEP);
470 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
471 tracehook_report_syscall_exit(regs, step);
474 /* Called with interrupts disabled */
475 asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
477 /* This is called after a single step exception (DEBUGSS).
478 There is no need to change the PC, as it is a post-execution
479 exception, as entry.S does not do anything to the PC for DEBUGSS.
480 We need to clear the Single Step setting in SR to avoid
481 continually stepping. */
483 regs->sr &= ~SR_SSTEP;
484 force_sig(SIGTRAP, current);
487 /* Called with interrupts disabled */
488 BUILD_TRAP_HANDLER(breakpoint)
492 /* We need to forward step the PC, to counteract the backstep done
495 force_sig(SIGTRAP, current);
500 * Called by kernel/ptrace.c when detaching..
502 * Make sure single step bits etc are not set.
504 void ptrace_disable(struct task_struct *child)
506 user_disable_single_step(child);