2 * linux/arch/m68k/kernel/ptrace.c
4 * Copyright (C) 1994 by Hamish Macdonald
5 * Taken from linux/kernel/ptrace.c and modified for M680x0.
6 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
8 * This file is subject to the terms and conditions of the GNU General
9 * Public License. See the file COPYING in the main directory of
10 * this archive for more details.
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
16 #include <linux/smp.h>
17 #include <linux/smp_lock.h>
18 #include <linux/errno.h>
19 #include <linux/ptrace.h>
20 #include <linux/user.h>
21 #include <linux/config.h>
22 #include <linux/signal.h>
24 #include <asm/uaccess.h>
26 #include <asm/pgtable.h>
27 #include <asm/system.h>
28 #include <asm/processor.h>
31 * does not yet catch signals sent when the child dies.
32 * in exit.c or in signal.c.
35 /* determines which bits in the SR the user has access to. */
36 /* 1 = access 0 = no access */
37 #define SR_MASK 0x001f
39 /* sets the trace bits. */
40 #define TRACE_BITS 0x8000
42 /* Find the stack offset for a register, relative to thread.esp0. */
43 #define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
44 #define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \
45 - sizeof(struct switch_stack))
46 /* Mapping from PT_xxx to the stack offset at which the register is
47 saved. Notice that usp has no stack-slot and needs to be treated
48 specially (see get_reg/put_reg below). */
49 static int regoff
[] = {
66 [16] = PT_REG(orig_d0
),
72 * Get contents of register REGNO in task TASK.
74 static inline long get_reg(struct task_struct
*task
, int regno
)
79 addr
= &task
->thread
.usp
;
80 else if (regno
< sizeof(regoff
)/sizeof(regoff
[0]))
81 addr
= (unsigned long *)(task
->thread
.esp0
+ regoff
[regno
]);
88 * Write contents of register REGNO in task TASK.
90 static inline int put_reg(struct task_struct
*task
, int regno
,
96 addr
= &task
->thread
.usp
;
97 else if (regno
< sizeof(regoff
)/sizeof(regoff
[0]))
98 addr
= (unsigned long *)(task
->thread
.esp0
+ regoff
[regno
]);
106 * Called by kernel/ptrace.c when detaching..
108 * Make sure the single step bit is not set.
110 void ptrace_disable(struct task_struct
*child
)
113 /* make sure the single step bit is not set. */
114 tmp
= get_reg(child
, PT_SR
) & ~(TRACE_BITS
<< 16);
115 put_reg(child
, PT_SR
, tmp
);
116 child
->thread
.work
.delayed_trace
= 0;
117 child
->thread
.work
.syscall_trace
= 0;
120 asmlinkage
int sys_ptrace(long request
, long pid
, long addr
, long data
)
122 struct task_struct
*child
;
127 if (request
== PTRACE_TRACEME
) {
128 /* are we already being traced? */
129 if (current
->ptrace
& PT_PTRACED
)
131 /* set the ptrace bit in the process flags. */
132 current
->ptrace
|= PT_PTRACED
;
137 read_lock(&tasklist_lock
);
138 child
= find_task_by_pid(pid
);
140 get_task_struct(child
);
141 read_unlock(&tasklist_lock
);
146 if (pid
== 1) /* you may not mess with init */
149 if (request
== PTRACE_ATTACH
) {
150 ret
= ptrace_attach(child
);
154 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
159 /* when I and D space are separate, these will need to be fixed. */
160 case PTRACE_PEEKTEXT
: /* read word at location addr. */
161 case PTRACE_PEEKDATA
: {
165 copied
= access_process_vm(child
, addr
, &tmp
, sizeof(tmp
), 0);
167 if (copied
!= sizeof(tmp
))
169 ret
= put_user(tmp
, (unsigned long *)data
);
173 /* read the word at location addr in the USER area. */
174 case PTRACE_PEEKUSR
: {
178 if ((addr
& 3) || addr
< 0 ||
179 addr
> sizeof(struct user
) - 3)
182 tmp
= 0; /* Default return condition */
183 addr
= addr
>> 2; /* temporary hack. */
186 tmp
= get_reg(child
, addr
);
189 } else if (addr
>= 21 && addr
< 49) {
190 tmp
= child
->thread
.fp
[addr
- 21];
191 #ifdef CONFIG_M68KFPU_EMU
192 /* Convert internal fpu reg representation
193 * into long double format
195 if (FPU_IS_EMU
&& (addr
< 45) && !(addr
% 3))
196 tmp
= ((tmp
& 0xffff0000) << 15) |
197 ((tmp
& 0x0000ffff) << 16);
201 ret
= put_user(tmp
, (unsigned long *)data
);
205 /* when I and D space are separate, this will have to be fixed. */
206 case PTRACE_POKETEXT
: /* write the word at location addr. */
207 case PTRACE_POKEDATA
:
209 if (access_process_vm(child
, addr
, &data
, sizeof(data
), 1) == sizeof(data
))
214 case PTRACE_POKEUSR
: /* write the word at location addr in the USER area */
216 if ((addr
& 3) || addr
< 0 ||
217 addr
> sizeof(struct user
) - 3)
220 addr
= addr
>> 2; /* temporary hack. */
225 data
|= get_reg(child
, PT_SR
) & ~(SR_MASK
<< 16);
228 if (put_reg(child
, addr
, data
))
233 if (addr
>= 21 && addr
< 48) {
234 #ifdef CONFIG_M68KFPU_EMU
235 /* Convert long double format
236 * into internal fpu reg representation
238 if (FPU_IS_EMU
&& (addr
< 45) && !(addr
% 3)) {
239 data
= (unsigned long)data
<< 15;
240 data
= (data
& 0xffff0000) |
241 ((data
& 0x0000ffff) >> 1);
244 child
->thread
.fp
[addr
- 21] = data
;
249 case PTRACE_SYSCALL
: /* continue and stop at next (return from) syscall */
250 case PTRACE_CONT
: { /* restart after signal. */
254 if (!valid_signal(data
))
256 if (request
== PTRACE_SYSCALL
) {
257 child
->thread
.work
.syscall_trace
= ~0;
259 child
->thread
.work
.syscall_trace
= 0;
261 child
->exit_code
= data
;
262 /* make sure the single step bit is not set. */
263 tmp
= get_reg(child
, PT_SR
) & ~(TRACE_BITS
<< 16);
264 put_reg(child
, PT_SR
, tmp
);
265 child
->thread
.work
.delayed_trace
= 0;
266 wake_up_process(child
);
272 * make the child exit. Best I can do is send it a sigkill.
273 * perhaps it should be put in the status that it wants to
280 if (child
->exit_state
== EXIT_ZOMBIE
) /* already dead */
282 child
->exit_code
= SIGKILL
;
283 /* make sure the single step bit is not set. */
284 tmp
= get_reg(child
, PT_SR
) & ~(TRACE_BITS
<< 16);
285 put_reg(child
, PT_SR
, tmp
);
286 child
->thread
.work
.delayed_trace
= 0;
287 wake_up_process(child
);
291 case PTRACE_SINGLESTEP
: { /* set the trap flag. */
295 if (!valid_signal(data
))
297 child
->thread
.work
.syscall_trace
= 0;
298 tmp
= get_reg(child
, PT_SR
) | (TRACE_BITS
<< 16);
299 put_reg(child
, PT_SR
, tmp
);
300 child
->thread
.work
.delayed_trace
= 1;
302 child
->exit_code
= data
;
303 /* give it a chance to run. */
304 wake_up_process(child
);
309 case PTRACE_DETACH
: /* detach a process that was attached. */
310 ret
= ptrace_detach(child
, data
);
313 case PTRACE_GETREGS
: { /* Get all gp regs from the child. */
316 for (i
= 0; i
< 19; i
++) {
317 tmp
= get_reg(child
, i
);
320 if (put_user(tmp
, (unsigned long *)data
)) {
324 data
+= sizeof(long);
330 case PTRACE_SETREGS
: { /* Set all gp regs in the child. */
333 for (i
= 0; i
< 19; i
++) {
334 if (get_user(tmp
, (unsigned long *)data
)) {
341 tmp
|= get_reg(child
, PT_SR
) & ~(SR_MASK
<< 16);
343 put_reg(child
, i
, tmp
);
344 data
+= sizeof(long);
350 case PTRACE_GETFPREGS
: { /* Get the child FPU state. */
352 if (copy_to_user((void *)data
, &child
->thread
.fp
,
353 sizeof(struct user_m68kfp_struct
)))
358 case PTRACE_SETFPREGS
: { /* Set the child FPU state. */
360 if (copy_from_user(&child
->thread
.fp
, (void *)data
,
361 sizeof(struct user_m68kfp_struct
)))
367 ret
= ptrace_request(child
, request
, addr
, data
);
371 put_task_struct(child
);
377 asmlinkage
void syscall_trace(void)
379 if (!current
->thread
.work
.delayed_trace
&&
380 !current
->thread
.work
.syscall_trace
)
382 ptrace_notify(SIGTRAP
| ((current
->ptrace
& PT_TRACESYSGOOD
)
385 * this isn't the same as continuing with a signal, but it will do
386 * for normal use. strace only continues with a signal if the
387 * stopping signal is not SIGTRAP. -brl
389 if (current
->exit_code
) {
390 send_sig(current
->exit_code
, current
, 1);
391 current
->exit_code
= 0;
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