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 /* This mask defines the bits of the SR which the user is not allowed to
44 change, which are everything except S, Q, M, PR, SZ, FR. */
45 #define SR_MASK (0xffff8cfd)
48 * does not yet catch signals sent when the child dies.
49 * in exit.c or in signal.c.
53 * This routine will get a word from the user area in the process kernel stack.
55 static inline int get_stack_long(struct task_struct *task, int offset)
59 stack = (unsigned char *)(task->thread.uregs);
61 return (*((int *)stack));
64 static inline unsigned long
65 get_fpu_long(struct task_struct *task, unsigned long addr)
69 regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
71 if (!tsk_used_math(task)) {
72 if (addr == offsetof(struct user_fpu_struct, fpscr)) {
75 tmp = 0xffffffffUL; /* matches initial value in fpu.c */
80 if (last_task_used_math == task) {
84 last_task_used_math = 0;
88 tmp = ((long *)&task->thread.fpu)[addr / sizeof(unsigned long)];
93 * This routine will put a word into the user area in the process kernel stack.
95 static inline int put_stack_long(struct task_struct *task, int offset,
100 stack = (unsigned char *)(task->thread.uregs);
102 *(unsigned long *) stack = data;
107 put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
109 struct pt_regs *regs;
111 regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
113 if (!tsk_used_math(task)) {
114 fpinit(&task->thread.fpu.hard);
115 set_stopped_child_used_math(task);
116 } else if (last_task_used_math == task) {
118 save_fpu(task, regs);
120 last_task_used_math = 0;
124 ((long *)&task->thread.fpu)[addr / sizeof(unsigned long)] = data;
128 void user_enable_single_step(struct task_struct *child)
130 struct pt_regs *regs = child->thread.uregs;
132 regs->sr |= SR_SSTEP; /* auto-resetting upon exception */
135 void user_disable_single_step(struct task_struct *child)
137 struct pt_regs *regs = child->thread.uregs;
139 regs->sr &= ~SR_SSTEP;
142 static int genregs_get(struct task_struct *target,
143 const struct user_regset *regset,
144 unsigned int pos, unsigned int count,
145 void *kbuf, void __user *ubuf)
147 const struct pt_regs *regs = task_pt_regs(target);
150 /* PC, SR, SYSCALL */
151 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
153 0, 3 * sizeof(unsigned long long));
157 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
159 offsetof(struct pt_regs, regs[0]),
160 63 * sizeof(unsigned long long));
163 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
165 offsetof(struct pt_regs, tregs[0]),
166 8 * sizeof(unsigned long long));
169 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
170 sizeof(struct pt_regs), -1);
175 static int genregs_set(struct task_struct *target,
176 const struct user_regset *regset,
177 unsigned int pos, unsigned int count,
178 const void *kbuf, const void __user *ubuf)
180 struct pt_regs *regs = task_pt_regs(target);
183 /* PC, SR, SYSCALL */
184 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
186 0, 3 * sizeof(unsigned long long));
189 if (!ret && count > 0)
190 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
192 offsetof(struct pt_regs, regs[0]),
193 63 * sizeof(unsigned long long));
196 if (!ret && count > 0)
197 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
199 offsetof(struct pt_regs, tregs[0]),
200 8 * sizeof(unsigned long long));
203 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
204 sizeof(struct pt_regs), -1);
210 int fpregs_get(struct task_struct *target,
211 const struct user_regset *regset,
212 unsigned int pos, unsigned int count,
213 void *kbuf, void __user *ubuf)
217 ret = init_fpu(target);
221 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
222 &target->thread.fpu.hard, 0, -1);
225 static int fpregs_set(struct task_struct *target,
226 const struct user_regset *regset,
227 unsigned int pos, unsigned int count,
228 const void *kbuf, const void __user *ubuf)
232 ret = init_fpu(target);
236 set_stopped_child_used_math(target);
238 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
239 &target->thread.fpu.hard, 0, -1);
242 static int fpregs_active(struct task_struct *target,
243 const struct user_regset *regset)
245 return tsk_used_math(target) ? regset->n : 0;
250 * These are our native regset flavours.
259 static const struct user_regset sh_regsets[] = {
267 .core_note_type = NT_PRSTATUS,
269 .size = sizeof(long long),
270 .align = sizeof(long long),
277 .core_note_type = NT_PRFPREG,
278 .n = sizeof(struct user_fpu_struct) /
280 .size = sizeof(long long),
281 .align = sizeof(long long),
284 .active = fpregs_active,
289 static const struct user_regset_view user_sh64_native_view = {
292 .regsets = sh_regsets,
293 .n = ARRAY_SIZE(sh_regsets),
296 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
298 return &user_sh64_native_view;
301 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
306 /* read the word at location addr in the USER area. */
307 case PTRACE_PEEKUSR: {
311 if ((addr & 3) || addr < 0)
314 if (addr < sizeof(struct pt_regs))
315 tmp = get_stack_long(child, addr);
316 else if ((addr >= offsetof(struct user, fpu)) &&
317 (addr < offsetof(struct user, u_fpvalid))) {
318 tmp = get_fpu_long(child, addr - offsetof(struct user, fpu));
319 } else if (addr == offsetof(struct user, u_fpvalid)) {
320 tmp = !!tsk_used_math(child);
324 ret = put_user(tmp, (unsigned long *)data);
329 /* write the word at location addr in the USER area. We must
330 disallow any changes to certain SR bits or u_fpvalid, since
331 this could crash the kernel or result in a security
334 if ((addr & 3) || addr < 0)
337 if (addr < sizeof(struct pt_regs)) {
338 /* Ignore change of top 32 bits of SR */
339 if (addr == offsetof (struct pt_regs, sr)+4)
344 /* If lower 32 bits of SR, ignore non-user bits */
345 if (addr == offsetof (struct pt_regs, sr))
347 long cursr = get_stack_long(child, addr);
349 data |= (cursr & SR_MASK);
351 ret = put_stack_long(child, addr, data);
353 else if ((addr >= offsetof(struct user, fpu)) &&
354 (addr < offsetof(struct user, u_fpvalid))) {
355 ret = put_fpu_long(child, addr - offsetof(struct user, fpu), data);
360 return copy_regset_to_user(child, &user_sh64_native_view,
362 0, sizeof(struct pt_regs),
363 (void __user *)data);
365 return copy_regset_from_user(child, &user_sh64_native_view,
367 0, sizeof(struct pt_regs),
368 (const void __user *)data);
370 case PTRACE_GETFPREGS:
371 return copy_regset_to_user(child, &user_sh64_native_view,
373 0, sizeof(struct user_fpu_struct),
374 (void __user *)data);
375 case PTRACE_SETFPREGS:
376 return copy_regset_from_user(child, &user_sh64_native_view,
378 0, sizeof(struct user_fpu_struct),
379 (const void __user *)data);
382 ret = ptrace_request(child, request, addr, data);
389 asmlinkage int sh64_ptrace(long request, long pid, long addr, long data)
391 #define WPC_DBRMODE 0x0d104008
392 static int first_call = 1;
396 /* Set WPC.DBRMODE to 0. This makes all debug events get
397 * delivered through RESVEC, i.e. into the handlers in entry.S.
398 * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
399 * would normally be left set to 1, which makes debug events get
400 * delivered through DBRVEC, i.e. into the remote gdb's
401 * handlers. This prevents ptrace getting them, and confuses
402 * the remote gdb.) */
403 printk("DBRMODE set to 0 to permit native debugging\n");
404 poke_real_address_q(WPC_DBRMODE, 0);
409 return sys_ptrace(request, pid, addr, data);
412 static inline int audit_arch(void)
417 arch |= __AUDIT_ARCH_64BIT;
419 #ifdef CONFIG_CPU_LITTLE_ENDIAN
420 arch |= __AUDIT_ARCH_LE;
426 asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs)
430 secure_computing(regs->regs[9]);
432 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
433 tracehook_report_syscall_entry(regs))
435 * Tracing decided this syscall should not happen.
436 * We'll return a bogus call number to get an ENOSYS
437 * error, but leave the original number in regs->regs[0].
441 if (unlikely(current->audit_context))
442 audit_syscall_entry(audit_arch(), regs->regs[1],
443 regs->regs[2], regs->regs[3],
444 regs->regs[4], regs->regs[5]);
446 return ret ?: regs->regs[9];
449 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
451 if (unlikely(current->audit_context))
452 audit_syscall_exit(AUDITSC_RESULT(regs->regs[9]),
455 if (test_thread_flag(TIF_SYSCALL_TRACE))
456 tracehook_report_syscall_exit(regs, 0);
459 /* Called with interrupts disabled */
460 asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
462 /* This is called after a single step exception (DEBUGSS).
463 There is no need to change the PC, as it is a post-execution
464 exception, as entry.S does not do anything to the PC for DEBUGSS.
465 We need to clear the Single Step setting in SR to avoid
466 continually stepping. */
468 regs->sr &= ~SR_SSTEP;
469 force_sig(SIGTRAP, current);
472 /* Called with interrupts disabled */
473 asmlinkage void do_software_break_point(unsigned long long vec,
474 struct pt_regs *regs)
476 /* We need to forward step the PC, to counteract the backstep done
479 force_sig(SIGTRAP, current);
484 * Called by kernel/ptrace.c when detaching..
486 * Make sure single step bits etc are not set.
488 void ptrace_disable(struct task_struct *child)
490 user_disable_single_step(child);