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 ret
= ptrace_traceme();
56 child
= ptrace_get_task_struct(pid
);
62 if (request
== PTRACE_ATTACH
) {
63 ret
= ptrace_attach(child
);
67 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
72 /* when I and D space are separate, these will need to be fixed. */
73 case PTRACE_PEEKTEXT
: /* read word at location addr. */
74 case PTRACE_PEEKDATA
: {
78 copied
= access_process_vm(child
, addr
, &tmp
, sizeof(tmp
), 0);
80 if (copied
!= sizeof(tmp
))
82 ret
= put_user(tmp
, (u32 __user
*)data
);
87 * Read 4 bytes of the other process' storage
88 * data is a pointer specifying where the user wants the
90 * addr is a pointer in the user's storage that contains an 8 byte
91 * address in the other process of the 4 bytes that is to be read
92 * (this is run in a 32-bit process looking at a 64-bit process)
93 * when I and D space are separate, these will need to be fixed.
95 case PPC_PTRACE_PEEKTEXT_3264
:
96 case PPC_PTRACE_PEEKDATA_3264
: {
99 u32 __user
* addrOthers
;
103 /* Get the addr in the other process that we want to read */
104 if (get_user(addrOthers
, (u32 __user
* __user
*)addr
) != 0)
107 copied
= access_process_vm(child
, (u64
)addrOthers
, &tmp
,
109 if (copied
!= sizeof(tmp
))
111 ret
= put_user(tmp
, (u32 __user
*)data
);
115 /* Read a register (specified by ADDR) out of the "user area" */
116 case PTRACE_PEEKUSR
: {
121 /* convert to index and check */
122 index
= (unsigned long) addr
>> 2;
123 if ((addr
& 3) || (index
> PT_FPSCR32
))
126 if (index
< PT_FPR0
) {
127 tmp
= get_reg(child
, index
);
129 flush_fp_to_thread(child
);
131 * the user space code considers the floating point
132 * to be an array of unsigned int (32 bits) - the
133 * index passed in is based on this assumption.
135 tmp
= ((unsigned int *)child
->thread
.fpr
)[index
- PT_FPR0
];
137 ret
= put_user((unsigned int)tmp
, (u32 __user
*)data
);
142 * Read 4 bytes out of the other process' pt_regs area
143 * data is a pointer specifying where the user wants the
144 * 4 bytes copied into
145 * addr is the offset into the other process' pt_regs structure
147 * (this is run in a 32-bit process looking at a 64-bit process)
149 case PPC_PTRACE_PEEKUSR_3264
: {
157 /* Determine which register the user wants */
158 index
= (u64
)addr
>> 2;
160 /* Determine which part of the register the user wants */
162 part
= 1; /* want the 2nd half of the register (right-most). */
164 part
= 0; /* want the 1st half of the register (left-most). */
166 /* Validate the input - check to see if address is on the wrong boundary or beyond the end of the user area */
167 if ((addr
& 3) || numReg
> PT_FPSCR
)
170 if (numReg
>= PT_FPR0
) {
171 flush_fp_to_thread(child
);
172 tmp
= ((unsigned long int *)child
->thread
.fpr
)[numReg
- PT_FPR0
];
173 } else { /* register within PT_REGS struct */
174 tmp
= get_reg(child
, numReg
);
176 reg32bits
= ((u32
*)&tmp
)[part
];
177 ret
= put_user(reg32bits
, (u32 __user
*)data
);
181 /* If I and D space are separate, this will have to be fixed. */
182 case PTRACE_POKETEXT
: /* write the word at location addr. */
183 case PTRACE_POKEDATA
: {
187 if (access_process_vm(child
, addr
, &tmp
, sizeof(tmp
), 1)
195 * Write 4 bytes into the other process' storage
196 * data is the 4 bytes that the user wants written
197 * addr is a pointer in the user's storage that contains an
198 * 8 byte address in the other process where the 4 bytes
199 * that is to be written
200 * (this is run in a 32-bit process looking at a 64-bit process)
201 * when I and D space are separate, these will need to be fixed.
203 case PPC_PTRACE_POKETEXT_3264
:
204 case PPC_PTRACE_POKEDATA_3264
: {
206 u32 __user
* addrOthers
;
208 /* Get the addr in the other process that we want to write into */
210 if (get_user(addrOthers
, (u32 __user
* __user
*)addr
) != 0)
213 if (access_process_vm(child
, (u64
)addrOthers
, &tmp
,
214 sizeof(tmp
), 1) == sizeof(tmp
))
220 /* write the word at location addr in the USER area */
221 case PTRACE_POKEUSR
: {
225 /* convert to index and check */
226 index
= (unsigned long) addr
>> 2;
227 if ((addr
& 3) || (index
> PT_FPSCR32
))
230 if (index
== PT_ORIG_R3
)
232 if (index
< PT_FPR0
) {
233 ret
= put_reg(child
, index
, data
);
235 flush_fp_to_thread(child
);
237 * the user space code considers the floating point
238 * to be an array of unsigned int (32 bits) - the
239 * index passed in is based on this assumption.
241 ((unsigned int *)child
->thread
.fpr
)[index
- PT_FPR0
] = data
;
248 * Write 4 bytes into the other process' pt_regs area
249 * data is the 4 bytes that the user wants written
250 * addr is the offset into the other process' pt_regs structure
251 * that is to be written into
252 * (this is run in a 32-bit process looking at a 64-bit process)
254 case PPC_PTRACE_POKEUSR_3264
: {
259 /* Determine which register the user wants */
260 index
= (u64
)addr
>> 2;
263 * Validate the input - check to see if address is on the
264 * wrong boundary or beyond the end of the user area
266 if ((addr
& 3) || (numReg
> PT_FPSCR
))
268 /* Insure it is a register we let them change */
269 if ((numReg
== PT_ORIG_R3
)
270 || ((numReg
> PT_CCR
) && (numReg
< PT_FPR0
)))
272 if (numReg
>= PT_FPR0
) {
273 flush_fp_to_thread(child
);
275 if (numReg
== PT_MSR
)
276 data
= (data
& MSR_DEBUGCHANGE
)
277 | (child
->thread
.regs
->msr
& ~MSR_DEBUGCHANGE
);
278 ((u32
*)child
->thread
.regs
)[index
] = data
;
283 case PTRACE_SYSCALL
: /* continue and stop at next (return from) syscall */
284 case PTRACE_CONT
: { /* restart after signal. */
286 if (!valid_signal(data
))
288 if (request
== PTRACE_SYSCALL
)
289 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
291 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
292 child
->exit_code
= data
;
293 /* make sure the single step bit is not set. */
294 clear_single_step(child
);
295 wake_up_process(child
);
301 * make the child exit. Best I can do is send it a sigkill.
302 * perhaps it should be put in the status that it wants to
307 if (child
->exit_state
== EXIT_ZOMBIE
) /* already dead */
309 child
->exit_code
= SIGKILL
;
310 /* make sure the single step bit is not set. */
311 clear_single_step(child
);
312 wake_up_process(child
);
316 case PTRACE_SINGLESTEP
: { /* set the trap flag. */
318 if (!valid_signal(data
))
320 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
321 set_single_step(child
);
322 child
->exit_code
= data
;
323 /* give it a chance to run. */
324 wake_up_process(child
);
329 case PTRACE_GET_DEBUGREG
: {
331 /* We only support one DABR and no IABRS at the moment */
334 ret
= put_user(child
->thread
.dabr
, (u32 __user
*)data
);
338 case PTRACE_SET_DEBUGREG
:
339 ret
= ptrace_set_debugreg(child
, addr
, data
);
343 ret
= ptrace_detach(child
, data
);
346 case PPC_PTRACE_GETREGS
: { /* Get GPRs 0 - 31. */
348 unsigned long *reg
= &((unsigned long *)child
->thread
.regs
)[0];
349 unsigned int __user
*tmp
= (unsigned int __user
*)addr
;
351 for (i
= 0; i
< 32; i
++) {
352 ret
= put_user(*reg
, tmp
);
361 case PPC_PTRACE_SETREGS
: { /* Set GPRs 0 - 31. */
363 unsigned long *reg
= &((unsigned long *)child
->thread
.regs
)[0];
364 unsigned int __user
*tmp
= (unsigned int __user
*)addr
;
366 for (i
= 0; i
< 32; i
++) {
367 ret
= get_user(*reg
, tmp
);
376 case PPC_PTRACE_GETFPREGS
: { /* Get FPRs 0 - 31. */
378 unsigned long *reg
= &((unsigned long *)child
->thread
.fpr
)[0];
379 unsigned int __user
*tmp
= (unsigned int __user
*)addr
;
381 flush_fp_to_thread(child
);
383 for (i
= 0; i
< 32; i
++) {
384 ret
= put_user(*reg
, tmp
);
393 case PPC_PTRACE_SETFPREGS
: { /* Get FPRs 0 - 31. */
395 unsigned long *reg
= &((unsigned long *)child
->thread
.fpr
)[0];
396 unsigned int __user
*tmp
= (unsigned int __user
*)addr
;
398 flush_fp_to_thread(child
);
400 for (i
= 0; i
< 32; i
++) {
401 ret
= get_user(*reg
, tmp
);
410 case PTRACE_GETEVENTMSG
:
411 ret
= put_user(child
->ptrace_message
, (unsigned int __user
*) data
);
414 #ifdef CONFIG_ALTIVEC
415 case PTRACE_GETVRREGS
:
416 /* Get the child altivec register state. */
417 flush_altivec_to_thread(child
);
418 ret
= get_vrregs((unsigned long __user
*)data
, child
);
421 case PTRACE_SETVRREGS
:
422 /* Set the child altivec register state. */
423 flush_altivec_to_thread(child
);
424 ret
= set_vrregs(child
, (unsigned long __user
*)data
);
429 ret
= ptrace_request(child
, request
, addr
, data
);
433 put_task_struct(child
);