2 * ptrace for 32-bit processes running on a 64-bit kernel.
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@samba.org).
15 * This file is subject to the terms and conditions of the GNU General
16 * Public License. See the file COPYING in the main directory of
17 * this archive for more details.
20 #include <linux/config.h>
21 #include <linux/kernel.h>
22 #include <linux/sched.h>
24 #include <linux/smp.h>
25 #include <linux/smp_lock.h>
26 #include <linux/errno.h>
27 #include <linux/ptrace.h>
28 #include <linux/user.h>
29 #include <linux/security.h>
30 #include <linux/signal.h>
32 #include <asm/uaccess.h>
34 #include <asm/pgtable.h>
35 #include <asm/system.h>
37 #include "ptrace-common.h"
40 * does not yet catch signals sent when the child dies.
41 * in exit.c or in signal.c.
44 long compat_sys_ptrace(int request
, int pid
, unsigned long addr
,
47 struct task_struct
*child
;
51 if (request
== PTRACE_TRACEME
) {
52 /* are we already being traced? */
53 if (current
->ptrace
& PT_PTRACED
)
55 ret
= security_ptrace(current
->parent
, current
);
58 /* set the ptrace bit in the process flags. */
59 current
->ptrace
|= PT_PTRACED
;
64 read_lock(&tasklist_lock
);
65 child
= find_task_by_pid(pid
);
67 get_task_struct(child
);
68 read_unlock(&tasklist_lock
);
73 if (pid
== 1) /* you may not mess with init */
76 if (request
== PTRACE_ATTACH
) {
77 ret
= ptrace_attach(child
);
81 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
86 /* when I and D space are separate, these will need to be fixed. */
87 case PTRACE_PEEKTEXT
: /* read word at location addr. */
88 case PTRACE_PEEKDATA
: {
92 copied
= access_process_vm(child
, addr
, &tmp
, sizeof(tmp
), 0);
94 if (copied
!= sizeof(tmp
))
96 ret
= put_user(tmp
, (u32 __user
*)data
);
101 * Read 4 bytes of the other process' storage
102 * data is a pointer specifying where the user wants the
103 * 4 bytes copied into
104 * addr is a pointer in the user's storage that contains an 8 byte
105 * address in the other process of the 4 bytes that is to be read
106 * (this is run in a 32-bit process looking at a 64-bit process)
107 * when I and D space are separate, these will need to be fixed.
109 case PPC_PTRACE_PEEKTEXT_3264
:
110 case PPC_PTRACE_PEEKDATA_3264
: {
113 u32 __user
* addrOthers
;
117 /* Get the addr in the other process that we want to read */
118 if (get_user(addrOthers
, (u32 __user
* __user
*)addr
) != 0)
121 copied
= access_process_vm(child
, (u64
)addrOthers
, &tmp
,
123 if (copied
!= sizeof(tmp
))
125 ret
= put_user(tmp
, (u32 __user
*)data
);
129 /* Read a register (specified by ADDR) out of the "user area" */
130 case PTRACE_PEEKUSR
: {
135 /* convert to index and check */
136 index
= (unsigned long) addr
>> 2;
137 if ((addr
& 3) || (index
> PT_FPSCR32
))
140 if (index
< PT_FPR0
) {
141 tmp
= get_reg(child
, index
);
143 flush_fp_to_thread(child
);
145 * the user space code considers the floating point
146 * to be an array of unsigned int (32 bits) - the
147 * index passed in is based on this assumption.
149 tmp
= ((unsigned int *)child
->thread
.fpr
)[index
- PT_FPR0
];
151 ret
= put_user((unsigned int)tmp
, (u32 __user
*)data
);
156 * Read 4 bytes out of the other process' pt_regs area
157 * data is a pointer specifying where the user wants the
158 * 4 bytes copied into
159 * addr is the offset into the other process' pt_regs structure
161 * (this is run in a 32-bit process looking at a 64-bit process)
163 case PPC_PTRACE_PEEKUSR_3264
: {
171 /* Determine which register the user wants */
172 index
= (u64
)addr
>> 2;
174 /* Determine which part of the register the user wants */
176 part
= 1; /* want the 2nd half of the register (right-most). */
178 part
= 0; /* want the 1st half of the register (left-most). */
180 /* Validate the input - check to see if address is on the wrong boundary or beyond the end of the user area */
181 if ((addr
& 3) || numReg
> PT_FPSCR
)
184 if (numReg
>= PT_FPR0
) {
185 flush_fp_to_thread(child
);
186 tmp
= ((unsigned long int *)child
->thread
.fpr
)[numReg
- PT_FPR0
];
187 } else { /* register within PT_REGS struct */
188 tmp
= get_reg(child
, numReg
);
190 reg32bits
= ((u32
*)&tmp
)[part
];
191 ret
= put_user(reg32bits
, (u32 __user
*)data
);
195 /* If I and D space are separate, this will have to be fixed. */
196 case PTRACE_POKETEXT
: /* write the word at location addr. */
197 case PTRACE_POKEDATA
: {
201 if (access_process_vm(child
, addr
, &tmp
, sizeof(tmp
), 1)
209 * Write 4 bytes into the other process' storage
210 * data is the 4 bytes that the user wants written
211 * addr is a pointer in the user's storage that contains an
212 * 8 byte address in the other process where the 4 bytes
213 * that is to be written
214 * (this is run in a 32-bit process looking at a 64-bit process)
215 * when I and D space are separate, these will need to be fixed.
217 case PPC_PTRACE_POKETEXT_3264
:
218 case PPC_PTRACE_POKEDATA_3264
: {
220 u32 __user
* addrOthers
;
222 /* Get the addr in the other process that we want to write into */
224 if (get_user(addrOthers
, (u32 __user
* __user
*)addr
) != 0)
227 if (access_process_vm(child
, (u64
)addrOthers
, &tmp
,
228 sizeof(tmp
), 1) == sizeof(tmp
))
234 /* write the word at location addr in the USER area */
235 case PTRACE_POKEUSR
: {
239 /* convert to index and check */
240 index
= (unsigned long) addr
>> 2;
241 if ((addr
& 3) || (index
> PT_FPSCR32
))
244 if (index
== PT_ORIG_R3
)
246 if (index
< PT_FPR0
) {
247 ret
= put_reg(child
, index
, data
);
249 flush_fp_to_thread(child
);
251 * the user space code considers the floating point
252 * to be an array of unsigned int (32 bits) - the
253 * index passed in is based on this assumption.
255 ((unsigned int *)child
->thread
.fpr
)[index
- PT_FPR0
] = data
;
262 * Write 4 bytes into the other process' pt_regs area
263 * data is the 4 bytes that the user wants written
264 * addr is the offset into the other process' pt_regs structure
265 * that is to be written into
266 * (this is run in a 32-bit process looking at a 64-bit process)
268 case PPC_PTRACE_POKEUSR_3264
: {
273 /* Determine which register the user wants */
274 index
= (u64
)addr
>> 2;
277 * Validate the input - check to see if address is on the
278 * wrong boundary or beyond the end of the user area
280 if ((addr
& 3) || (numReg
> PT_FPSCR
))
282 /* Insure it is a register we let them change */
283 if ((numReg
== PT_ORIG_R3
)
284 || ((numReg
> PT_CCR
) && (numReg
< PT_FPR0
)))
286 if (numReg
>= PT_FPR0
) {
287 flush_fp_to_thread(child
);
289 if (numReg
== PT_MSR
)
290 data
= (data
& MSR_DEBUGCHANGE
)
291 | (child
->thread
.regs
->msr
& ~MSR_DEBUGCHANGE
);
292 ((u32
*)child
->thread
.regs
)[index
] = data
;
297 case PTRACE_SYSCALL
: /* continue and stop at next (return from) syscall */
298 case PTRACE_CONT
: { /* restart after signal. */
300 if (!valid_signal(data
))
302 if (request
== PTRACE_SYSCALL
)
303 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
305 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
306 child
->exit_code
= data
;
307 /* make sure the single step bit is not set. */
308 clear_single_step(child
);
309 wake_up_process(child
);
315 * make the child exit. Best I can do is send it a sigkill.
316 * perhaps it should be put in the status that it wants to
321 if (child
->exit_state
== EXIT_ZOMBIE
) /* already dead */
323 child
->exit_code
= SIGKILL
;
324 /* make sure the single step bit is not set. */
325 clear_single_step(child
);
326 wake_up_process(child
);
330 case PTRACE_SINGLESTEP
: { /* set the trap flag. */
332 if (!valid_signal(data
))
334 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
335 set_single_step(child
);
336 child
->exit_code
= data
;
337 /* give it a chance to run. */
338 wake_up_process(child
);
343 case PTRACE_GET_DEBUGREG
: {
345 /* We only support one DABR and no IABRS at the moment */
348 ret
= put_user(child
->thread
.dabr
, (u32 __user
*)data
);
352 case PTRACE_SET_DEBUGREG
:
353 ret
= ptrace_set_debugreg(child
, addr
, data
);
357 ret
= ptrace_detach(child
, data
);
360 case PPC_PTRACE_GETREGS
: { /* Get GPRs 0 - 31. */
362 unsigned long *reg
= &((unsigned long *)child
->thread
.regs
)[0];
363 unsigned int __user
*tmp
= (unsigned int __user
*)addr
;
365 for (i
= 0; i
< 32; i
++) {
366 ret
= put_user(*reg
, tmp
);
375 case PPC_PTRACE_SETREGS
: { /* Set GPRs 0 - 31. */
377 unsigned long *reg
= &((unsigned long *)child
->thread
.regs
)[0];
378 unsigned int __user
*tmp
= (unsigned int __user
*)addr
;
380 for (i
= 0; i
< 32; i
++) {
381 ret
= get_user(*reg
, tmp
);
390 case PPC_PTRACE_GETFPREGS
: { /* Get FPRs 0 - 31. */
392 unsigned long *reg
= &((unsigned long *)child
->thread
.fpr
)[0];
393 unsigned int __user
*tmp
= (unsigned int __user
*)addr
;
395 flush_fp_to_thread(child
);
397 for (i
= 0; i
< 32; i
++) {
398 ret
= put_user(*reg
, tmp
);
407 case PPC_PTRACE_SETFPREGS
: { /* Get FPRs 0 - 31. */
409 unsigned long *reg
= &((unsigned long *)child
->thread
.fpr
)[0];
410 unsigned int __user
*tmp
= (unsigned int __user
*)addr
;
412 flush_fp_to_thread(child
);
414 for (i
= 0; i
< 32; i
++) {
415 ret
= get_user(*reg
, tmp
);
424 case PTRACE_GETEVENTMSG
:
425 ret
= put_user(child
->ptrace_message
, (unsigned int __user
*) data
);
428 #ifdef CONFIG_ALTIVEC
429 case PTRACE_GETVRREGS
:
430 /* Get the child altivec register state. */
431 flush_altivec_to_thread(child
);
432 ret
= get_vrregs((unsigned long __user
*)data
, child
);
435 case PTRACE_SETVRREGS
:
436 /* Set the child altivec register state. */
437 flush_altivec_to_thread(child
);
438 ret
= set_vrregs(child
, (unsigned long __user
*)data
);
443 ret
= ptrace_request(child
, request
, addr
, data
);
447 put_task_struct(child
);