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2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * arch/sh64/kernel/ptrace.c
8 * Copyright (C) 2000, 2001 Paolo Alberelli
9 * Copyright (C) 2003 Paul Mundt
11 * Started from SH3/4 version:
12 * SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
14 * Original x86 implementation:
15 * By Ross Biro 1/23/92
16 * edited by Linus Torvalds
20 #include <linux/config.h>
21 #include <linux/kernel.h>
22 #include <linux/rwsem.h>
23 #include <linux/sched.h>
25 #include <linux/smp.h>
26 #include <linux/smp_lock.h>
27 #include <linux/errno.h>
28 #include <linux/ptrace.h>
29 #include <linux/user.h>
30 #include <linux/signal.h>
31 #include <linux/syscalls.h>
34 #include <asm/uaccess.h>
35 #include <asm/pgtable.h>
36 #include <asm/system.h>
37 #include <asm/processor.h>
38 #include <asm/mmu_context.h>
40 /* This mask defines the bits of the SR which the user is not allowed to
41 change, which are everything except S, Q, M, PR, SZ, FR. */
42 #define SR_MASK (0xffff8cfd)
45 * does not yet catch signals sent when the child dies.
46 * in exit.c or in signal.c.
50 * This routine will get a word from the user area in the process kernel stack.
52 static inline int get_stack_long(struct task_struct
*task
, int offset
)
56 stack
= (unsigned char *)(task
->thread
.uregs
);
58 return (*((int *)stack
));
61 static inline unsigned long
62 get_fpu_long(struct task_struct
*task
, unsigned long addr
)
66 regs
= (struct pt_regs
*)((unsigned char *)task
+ THREAD_SIZE
) - 1;
68 if (!tsk_used_math(task
)) {
69 if (addr
== offsetof(struct user_fpu_struct
, fpscr
)) {
72 tmp
= 0xffffffffUL
; /* matches initial value in fpu.c */
77 if (last_task_used_math
== task
) {
79 fpsave(&task
->thread
.fpu
.hard
);
81 last_task_used_math
= 0;
85 tmp
= ((long *)&task
->thread
.fpu
)[addr
/ sizeof(unsigned long)];
90 * This routine will put a word into the user area in the process kernel stack.
92 static inline int put_stack_long(struct task_struct
*task
, int offset
,
97 stack
= (unsigned char *)(task
->thread
.uregs
);
99 *(unsigned long *) stack
= data
;
104 put_fpu_long(struct task_struct
*task
, unsigned long addr
, unsigned long data
)
106 struct pt_regs
*regs
;
108 regs
= (struct pt_regs
*)((unsigned char *)task
+ THREAD_SIZE
) - 1;
110 if (!tsk_used_math(task
)) {
111 fpinit(&task
->thread
.fpu
.hard
);
112 set_stopped_child_used_math(task
);
113 } else if (last_task_used_math
== task
) {
115 fpsave(&task
->thread
.fpu
.hard
);
117 last_task_used_math
= 0;
121 ((long *)&task
->thread
.fpu
)[addr
/ sizeof(unsigned long)] = data
;
126 long arch_ptrace(struct task_struct
*child
, long request
, long addr
, long data
)
131 /* when I and D space are separate, these will need to be fixed. */
132 case PTRACE_PEEKTEXT
: /* read word at location addr. */
133 case PTRACE_PEEKDATA
: {
137 copied
= access_process_vm(child
, addr
, &tmp
, sizeof(tmp
), 0);
139 if (copied
!= sizeof(tmp
))
141 ret
= put_user(tmp
,(unsigned long *) data
);
145 /* read the word at location addr in the USER area. */
146 case PTRACE_PEEKUSR
: {
150 if ((addr
& 3) || addr
< 0)
153 if (addr
< sizeof(struct pt_regs
))
154 tmp
= get_stack_long(child
, addr
);
155 else if ((addr
>= offsetof(struct user
, fpu
)) &&
156 (addr
< offsetof(struct user
, u_fpvalid
))) {
157 tmp
= get_fpu_long(child
, addr
- offsetof(struct user
, fpu
));
158 } else if (addr
== offsetof(struct user
, u_fpvalid
)) {
159 tmp
= !!tsk_used_math(child
);
163 ret
= put_user(tmp
, (unsigned long *)data
);
167 /* when I and D space are separate, this will have to be fixed. */
168 case PTRACE_POKETEXT
: /* write the word at location addr. */
169 case PTRACE_POKEDATA
:
171 if (access_process_vm(child
, addr
, &data
, sizeof(data
), 1) == sizeof(data
))
177 /* write the word at location addr in the USER area. We must
178 disallow any changes to certain SR bits or u_fpvalid, since
179 this could crash the kernel or result in a security
182 if ((addr
& 3) || addr
< 0)
185 if (addr
< sizeof(struct pt_regs
)) {
186 /* Ignore change of top 32 bits of SR */
187 if (addr
== offsetof (struct pt_regs
, sr
)+4)
192 /* If lower 32 bits of SR, ignore non-user bits */
193 if (addr
== offsetof (struct pt_regs
, sr
))
195 long cursr
= get_stack_long(child
, addr
);
197 data
|= (cursr
& SR_MASK
);
199 ret
= put_stack_long(child
, addr
, data
);
201 else if ((addr
>= offsetof(struct user
, fpu
)) &&
202 (addr
< offsetof(struct user
, u_fpvalid
))) {
203 ret
= put_fpu_long(child
, addr
- offsetof(struct user
, fpu
), data
);
207 case PTRACE_SYSCALL
: /* continue and stop at next (return from) syscall */
208 case PTRACE_CONT
: { /* restart after signal. */
210 if (!valid_signal(data
))
212 if (request
== PTRACE_SYSCALL
)
213 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
215 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
216 child
->exit_code
= data
;
217 wake_up_process(child
);
223 * make the child exit. Best I can do is send it a sigkill.
224 * perhaps it should be put in the status that it wants to
229 if (child
->exit_state
== EXIT_ZOMBIE
) /* already dead */
231 child
->exit_code
= SIGKILL
;
232 wake_up_process(child
);
236 case PTRACE_SINGLESTEP
: { /* set the trap flag. */
237 struct pt_regs
*regs
;
240 if (!valid_signal(data
))
242 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
243 if ((child
->ptrace
& PT_DTRACE
) == 0) {
244 /* Spurious delayed TF traps may occur */
245 child
->ptrace
|= PT_DTRACE
;
248 regs
= child
->thread
.uregs
;
250 regs
->sr
|= SR_SSTEP
; /* auto-resetting upon exception */
252 child
->exit_code
= data
;
253 /* give it a chance to run. */
254 wake_up_process(child
);
259 case PTRACE_DETACH
: /* detach a process that was attached. */
260 ret
= ptrace_detach(child
, data
);
264 ret
= ptrace_request(child
, request
, addr
, data
);
270 asmlinkage
int sh64_ptrace(long request
, long pid
, long addr
, long data
)
272 extern void poke_real_address_q(unsigned long long addr
, unsigned long long data
);
273 #define WPC_DBRMODE 0x0d104008
274 static int first_call
= 1;
278 /* Set WPC.DBRMODE to 0. This makes all debug events get
279 * delivered through RESVEC, i.e. into the handlers in entry.S.
280 * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
281 * would normally be left set to 1, which makes debug events get
282 * delivered through DBRVEC, i.e. into the remote gdb's
283 * handlers. This prevents ptrace getting them, and confuses
284 * the remote gdb.) */
285 printk("DBRMODE set to 0 to permit native debugging\n");
286 poke_real_address_q(WPC_DBRMODE
, 0);
291 return sys_ptrace(request
, pid
, addr
, data
);
294 asmlinkage
void syscall_trace(void)
296 struct task_struct
*tsk
= current
;
298 if (!test_thread_flag(TIF_SYSCALL_TRACE
))
300 if (!(tsk
->ptrace
& PT_PTRACED
))
303 ptrace_notify(SIGTRAP
| ((current
->ptrace
& PT_TRACESYSGOOD
)
306 * this isn't the same as continuing with a signal, but it will do
307 * for normal use. strace only continues with a signal if the
308 * stopping signal is not SIGTRAP. -brl
310 if (tsk
->exit_code
) {
311 send_sig(tsk
->exit_code
, tsk
, 1);
316 /* Called with interrupts disabled */
317 asmlinkage
void do_single_step(unsigned long long vec
, struct pt_regs
*regs
)
319 /* This is called after a single step exception (DEBUGSS).
320 There is no need to change the PC, as it is a post-execution
321 exception, as entry.S does not do anything to the PC for DEBUGSS.
322 We need to clear the Single Step setting in SR to avoid
323 continually stepping. */
325 regs
->sr
&= ~SR_SSTEP
;
326 force_sig(SIGTRAP
, current
);
329 /* Called with interrupts disabled */
330 asmlinkage
void do_software_break_point(unsigned long long vec
,
331 struct pt_regs
*regs
)
333 /* We need to forward step the PC, to counteract the backstep done
336 force_sig(SIGTRAP
, current
);
341 * Called by kernel/ptrace.c when detaching..
343 * Make sure single step bits etc are not set.
345 void ptrace_disable(struct task_struct
*child
)
347 /* nothing to do.. */