]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/m68k/kernel/ptrace.c
0beb53333ba354ea947365e6df22b0a05efcb8c6
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>
23 #include <asm/uaccess.h>
25 #include <asm/pgtable.h>
26 #include <asm/system.h>
27 #include <asm/processor.h>
30 * does not yet catch signals sent when the child dies.
31 * in exit.c or in signal.c.
34 /* determines which bits in the SR the user has access to. */
35 /* 1 = access 0 = no access */
36 #define SR_MASK 0x001f
38 /* sets the trace bits. */
39 #define TRACE_BITS 0x8000
41 /* Find the stack offset for a register, relative to thread.esp0. */
42 #define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
43 #define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \
44 - sizeof(struct switch_stack))
45 /* Mapping from PT_xxx to the stack offset at which the register is
46 saved. Notice that usp has no stack-slot and needs to be treated
47 specially (see get_reg/put_reg below). */
48 static int regoff
[] = {
65 [16] = PT_REG(orig_d0
),
71 * Get contents of register REGNO in task TASK.
73 static inline long get_reg(struct task_struct
*task
, int regno
)
78 addr
= &task
->thread
.usp
;
79 else if (regno
< sizeof(regoff
)/sizeof(regoff
[0]))
80 addr
= (unsigned long *)(task
->thread
.esp0
+ regoff
[regno
]);
87 * Write contents of register REGNO in task TASK.
89 static inline int put_reg(struct task_struct
*task
, int regno
,
95 addr
= &task
->thread
.usp
;
96 else if (regno
< sizeof(regoff
)/sizeof(regoff
[0]))
97 addr
= (unsigned long *) (task
->thread
.esp0
+ regoff
[regno
]);
105 * Called by kernel/ptrace.c when detaching..
107 * Make sure the single step bit is not set.
109 void ptrace_disable(struct task_struct
*child
)
112 /* make sure the single step bit is not set. */
113 tmp
= get_reg(child
, PT_SR
) & ~(TRACE_BITS
<< 16);
114 put_reg(child
, PT_SR
, tmp
);
115 child
->thread
.work
.delayed_trace
= 0;
116 child
->thread
.work
.syscall_trace
= 0;
119 asmlinkage
int sys_ptrace(long request
, long pid
, long addr
, long data
)
121 struct task_struct
*child
;
126 if (request
== PTRACE_TRACEME
) {
127 /* are we already being traced? */
128 if (current
->ptrace
& PT_PTRACED
)
130 /* set the ptrace bit in the process flags. */
131 current
->ptrace
|= PT_PTRACED
;
136 read_lock(&tasklist_lock
);
137 child
= find_task_by_pid(pid
);
139 get_task_struct(child
);
140 read_unlock(&tasklist_lock
);
145 if (pid
== 1) /* you may not mess with init */
148 if (request
== PTRACE_ATTACH
) {
149 ret
= ptrace_attach(child
);
153 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
158 /* when I and D space are separate, these will need to be fixed. */
159 case PTRACE_PEEKTEXT
: /* read word at location addr. */
160 case PTRACE_PEEKDATA
: {
164 copied
= access_process_vm(child
, addr
, &tmp
, sizeof(tmp
), 0);
166 if (copied
!= sizeof(tmp
))
168 ret
= put_user(tmp
,(unsigned long *) data
);
172 /* read the word at location addr in the USER area. */
173 case PTRACE_PEEKUSR
: {
177 if ((addr
& 3) || addr
< 0 ||
178 addr
> sizeof(struct user
) - 3)
181 tmp
= 0; /* Default return condition */
182 addr
= addr
>> 2; /* temporary hack. */
185 tmp
= get_reg(child
, addr
);
188 } else if (addr
>= 21 && addr
< 49) {
189 tmp
= child
->thread
.fp
[addr
- 21];
190 #ifdef CONFIG_M68KFPU_EMU
191 /* Convert internal fpu reg representation
192 * into long double format
194 if (FPU_IS_EMU
&& (addr
< 45) && !(addr
% 3))
195 tmp
= ((tmp
& 0xffff0000) << 15) |
196 ((tmp
& 0x0000ffff) << 16);
200 ret
= put_user(tmp
,(unsigned long *) data
);
204 /* when I and D space are separate, this will have to be fixed. */
205 case PTRACE_POKETEXT
: /* write the word at location addr. */
206 case PTRACE_POKEDATA
:
208 if (access_process_vm(child
, addr
, &data
, sizeof(data
), 1) == sizeof(data
))
213 case PTRACE_POKEUSR
: /* write the word at location addr in the USER area */
215 if ((addr
& 3) || addr
< 0 ||
216 addr
> sizeof(struct user
) - 3)
219 addr
= addr
>> 2; /* temporary hack. */
224 data
|= get_reg(child
, PT_SR
) & ~(SR_MASK
<< 16);
227 if (put_reg(child
, addr
, data
))
232 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 ((unsigned long) data
> _NSIG
)
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 ((unsigned long) data
> _NSIG
)
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;