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git.proxmox.com Git - mirror_ubuntu-hirsute-kernel.git/blob - arch/ppc/kernel/ptrace.c
2 * arch/ppc/kernel/ptrace.c
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
7 * Derived from "arch/m68k/kernel/ptrace.c"
8 * Copyright (C) 1994 by Hamish Macdonald
9 * Taken from linux/kernel/ptrace.c and modified for M680x0.
10 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
12 * Modified by Cort Dougan (cort@hq.fsmlabs.com)
13 * and Paul Mackerras (paulus@linuxcare.com.au).
15 * This file is subject to the terms and conditions of the GNU General
16 * Public License. See the file README.legal in the main directory of
17 * this archive for more details.
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
23 #include <linux/smp.h>
24 #include <linux/smp_lock.h>
25 #include <linux/errno.h>
26 #include <linux/ptrace.h>
27 #include <linux/user.h>
28 #include <linux/security.h>
30 #include <asm/uaccess.h>
32 #include <asm/pgtable.h>
33 #include <asm/system.h>
36 * Set of msr bits that gdb can change on behalf of a process.
38 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
39 #define MSR_DEBUGCHANGE 0
41 #define MSR_DEBUGCHANGE (MSR_SE | MSR_BE)
45 * does not yet catch signals sent when the child dies.
46 * in exit.c or in signal.c.
50 * Get contents of register REGNO in task TASK.
52 static inline unsigned long get_reg(struct task_struct
*task
, int regno
)
54 if (regno
< sizeof(struct pt_regs
) / sizeof(unsigned long)
55 && task
->thread
.regs
!= NULL
)
56 return ((unsigned long *)task
->thread
.regs
)[regno
];
61 * Write contents of register REGNO in task TASK.
63 static inline int put_reg(struct task_struct
*task
, int regno
,
66 if (regno
<= PT_MQ
&& task
->thread
.regs
!= NULL
) {
68 data
= (data
& MSR_DEBUGCHANGE
)
69 | (task
->thread
.regs
->msr
& ~MSR_DEBUGCHANGE
);
70 ((unsigned long *)task
->thread
.regs
)[regno
] = data
;
78 * Get contents of AltiVec register state in task TASK
80 static inline int get_vrregs(unsigned long __user
*data
, struct task_struct
*task
)
84 if (!access_ok(VERIFY_WRITE
, data
, 133 * sizeof(unsigned long)))
87 /* copy AltiVec registers VR[0] .. VR[31] */
88 for (i
= 0; i
< 32; i
++)
89 for (j
= 0; j
< 4; j
++, data
++)
90 if (__put_user(task
->thread
.vr
[i
].u
[j
], data
))
94 for (i
= 0; i
< 4; i
++, data
++)
95 if (__put_user(task
->thread
.vscr
.u
[i
], data
))
99 if (__put_user(task
->thread
.vrsave
, data
))
106 * Write contents of AltiVec register state into task TASK.
108 static inline int set_vrregs(struct task_struct
*task
, unsigned long __user
*data
)
112 if (!access_ok(VERIFY_READ
, data
, 133 * sizeof(unsigned long)))
115 /* copy AltiVec registers VR[0] .. VR[31] */
116 for (i
= 0; i
< 32; i
++)
117 for (j
= 0; j
< 4; j
++, data
++)
118 if (__get_user(task
->thread
.vr
[i
].u
[j
], data
))
122 for (i
= 0; i
< 4; i
++, data
++)
123 if (__get_user(task
->thread
.vscr
.u
[i
], data
))
127 if (__get_user(task
->thread
.vrsave
, data
))
137 * For get_evrregs/set_evrregs functions 'data' has the following layout:
147 * Get contents of SPE register state in task TASK.
149 static inline int get_evrregs(unsigned long *data
, struct task_struct
*task
)
153 if (!access_ok(VERIFY_WRITE
, data
, 35 * sizeof(unsigned long)))
157 if (__put_user(task
->thread
.spefscr
, &data
[34]))
160 /* copy SPE registers EVR[0] .. EVR[31] */
161 for (i
= 0; i
< 32; i
++, data
++)
162 if (__put_user(task
->thread
.evr
[i
], data
))
166 if (__put_user64(task
->thread
.acc
, (unsigned long long *)data
))
173 * Write contents of SPE register state into task TASK.
175 static inline int set_evrregs(struct task_struct
*task
, unsigned long *data
)
179 if (!access_ok(VERIFY_READ
, data
, 35 * sizeof(unsigned long)))
183 if (__get_user(task
->thread
.spefscr
, &data
[34]))
186 /* copy SPE registers EVR[0] .. EVR[31] */
187 for (i
= 0; i
< 32; i
++, data
++)
188 if (__get_user(task
->thread
.evr
[i
], data
))
191 if (__get_user64(task
->thread
.acc
, (unsigned long long*)data
))
196 #endif /* CONFIG_SPE */
199 set_single_step(struct task_struct
*task
)
201 struct pt_regs
*regs
= task
->thread
.regs
;
204 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
205 task
->thread
.dbcr0
= DBCR0_IDM
| DBCR0_IC
;
214 clear_single_step(struct task_struct
*task
)
216 struct pt_regs
*regs
= task
->thread
.regs
;
219 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
220 task
->thread
.dbcr0
= 0;
221 regs
->msr
&= ~MSR_DE
;
223 regs
->msr
&= ~MSR_SE
;
229 * Called by kernel/ptrace.c when detaching..
231 * Make sure single step bits etc are not set.
233 void ptrace_disable(struct task_struct
*child
)
235 /* make sure the single step bit is not set. */
236 clear_single_step(child
);
239 int sys_ptrace(long request
, long pid
, long addr
, long data
)
241 struct task_struct
*child
;
245 if (request
== PTRACE_TRACEME
) {
246 /* are we already being traced? */
247 if (current
->ptrace
& PT_PTRACED
)
249 ret
= security_ptrace(current
->parent
, current
);
252 /* set the ptrace bit in the process flags. */
253 current
->ptrace
|= PT_PTRACED
;
258 read_lock(&tasklist_lock
);
259 child
= find_task_by_pid(pid
);
261 get_task_struct(child
);
262 read_unlock(&tasklist_lock
);
267 if (pid
== 1) /* you may not mess with init */
270 if (request
== PTRACE_ATTACH
) {
271 ret
= ptrace_attach(child
);
275 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
280 /* when I and D space are separate, these will need to be fixed. */
281 case PTRACE_PEEKTEXT
: /* read word at location addr. */
282 case PTRACE_PEEKDATA
: {
286 copied
= access_process_vm(child
, addr
, &tmp
, sizeof(tmp
), 0);
288 if (copied
!= sizeof(tmp
))
290 ret
= put_user(tmp
,(unsigned long __user
*) data
);
294 /* read the word at location addr in the USER area. */
295 /* XXX this will need fixing for 64-bit */
296 case PTRACE_PEEKUSR
: {
297 unsigned long index
, tmp
;
300 /* convert to index and check */
301 index
= (unsigned long) addr
>> 2;
302 if ((addr
& 3) || index
> PT_FPSCR
303 || child
->thread
.regs
== NULL
)
306 CHECK_FULL_REGS(child
->thread
.regs
);
307 if (index
< PT_FPR0
) {
308 tmp
= get_reg(child
, (int) index
);
311 if (child
->thread
.regs
->msr
& MSR_FP
)
314 tmp
= ((unsigned long *)child
->thread
.fpr
)[index
- PT_FPR0
];
316 ret
= put_user(tmp
,(unsigned long __user
*) data
);
320 /* If I and D space are separate, this will have to be fixed. */
321 case PTRACE_POKETEXT
: /* write the word at location addr. */
322 case PTRACE_POKEDATA
:
324 if (access_process_vm(child
, addr
, &data
, sizeof(data
), 1) == sizeof(data
))
329 /* write the word at location addr in the USER area */
330 case PTRACE_POKEUSR
: {
334 /* convert to index and check */
335 index
= (unsigned long) addr
>> 2;
336 if ((addr
& 3) || index
> PT_FPSCR
337 || child
->thread
.regs
== NULL
)
340 CHECK_FULL_REGS(child
->thread
.regs
);
341 if (index
== PT_ORIG_R3
)
343 if (index
< PT_FPR0
) {
344 ret
= put_reg(child
, index
, data
);
347 if (child
->thread
.regs
->msr
& MSR_FP
)
350 ((unsigned long *)child
->thread
.fpr
)[index
- PT_FPR0
] = data
;
356 case PTRACE_SYSCALL
: /* continue and stop at next (return from) syscall */
357 case PTRACE_CONT
: { /* restart after signal. */
359 if ((unsigned long) data
> _NSIG
)
361 if (request
== PTRACE_SYSCALL
) {
362 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
364 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
366 child
->exit_code
= data
;
367 /* make sure the single step bit is not set. */
368 clear_single_step(child
);
369 wake_up_process(child
);
375 * make the child exit. Best I can do is send it a sigkill.
376 * perhaps it should be put in the status that it wants to
381 if (child
->exit_state
== EXIT_ZOMBIE
) /* already dead */
383 child
->exit_code
= SIGKILL
;
384 /* make sure the single step bit is not set. */
385 clear_single_step(child
);
386 wake_up_process(child
);
390 case PTRACE_SINGLESTEP
: { /* set the trap flag. */
392 if ((unsigned long) data
> _NSIG
)
394 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
395 set_single_step(child
);
396 child
->exit_code
= data
;
397 /* give it a chance to run. */
398 wake_up_process(child
);
404 ret
= ptrace_detach(child
, data
);
407 #ifdef CONFIG_ALTIVEC
408 case PTRACE_GETVRREGS
:
409 /* Get the child altivec register state. */
411 if (child
->thread
.regs
->msr
& MSR_VEC
)
412 giveup_altivec(child
);
414 ret
= get_vrregs((unsigned long __user
*)data
, child
);
417 case PTRACE_SETVRREGS
:
418 /* Set the child altivec register state. */
419 /* this is to clear the MSR_VEC bit to force a reload
420 * of register state from memory */
422 if (child
->thread
.regs
->msr
& MSR_VEC
)
423 giveup_altivec(child
);
425 ret
= set_vrregs(child
, (unsigned long __user
*)data
);
429 case PTRACE_GETEVRREGS
:
430 /* Get the child spe register state. */
431 if (child
->thread
.regs
->msr
& MSR_SPE
)
433 ret
= get_evrregs((unsigned long __user
*)data
, child
);
436 case PTRACE_SETEVRREGS
:
437 /* Set the child spe register state. */
438 /* this is to clear the MSR_SPE bit to force a reload
439 * of register state from memory */
440 if (child
->thread
.regs
->msr
& MSR_SPE
)
442 ret
= set_evrregs(child
, (unsigned long __user
*)data
);
447 ret
= ptrace_request(child
, request
, addr
, data
);
451 put_task_struct(child
);
457 void do_syscall_trace(void)
459 if (!test_thread_flag(TIF_SYSCALL_TRACE
)
460 || !(current
->ptrace
& PT_PTRACED
))
462 ptrace_notify(SIGTRAP
| ((current
->ptrace
& PT_TRACESYSGOOD
)
466 * this isn't the same as continuing with a signal, but it will do
467 * for normal use. strace only continues with a signal if the
468 * stopping signal is not SIGTRAP. -brl
470 if (current
->exit_code
) {
471 send_sig(current
->exit_code
, current
, 1);
472 current
->exit_code
= 0;