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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - arch/mips/kernel/ptrace.c
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1992 Ross Biro
7 * Copyright (C) Linus Torvalds
8 * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
9 * Copyright (C) 1996 David S. Miller
10 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
11 * Copyright (C) 1999 MIPS Technologies, Inc.
12 * Copyright (C) 2000 Ulf Carlsson
14 * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
17 #include <linux/config.h>
18 #include <linux/compiler.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
22 #include <linux/errno.h>
23 #include <linux/ptrace.h>
24 #include <linux/audit.h>
25 #include <linux/smp.h>
26 #include <linux/smp_lock.h>
27 #include <linux/user.h>
28 #include <linux/security.h>
29 #include <linux/signal.h>
31 #include <asm/byteorder.h>
35 #include <asm/mipsregs.h>
36 #include <asm/mipsmtregs.h>
37 #include <asm/pgtable.h>
39 #include <asm/system.h>
40 #include <asm/uaccess.h>
41 #include <asm/bootinfo.h>
45 * Called by kernel/ptrace.c when detaching..
47 * Make sure single step bits etc are not set.
49 void ptrace_disable(struct task_struct
*child
)
55 * Read a general register set. We always use the 64-bit format, even
56 * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
57 * Registers are sign extended to fill the available space.
59 int ptrace_getregs (struct task_struct
*child
, __s64 __user
*data
)
64 if (!access_ok(VERIFY_WRITE
, data
, 38 * 8))
67 regs
= (struct pt_regs
*) ((unsigned long) child
->thread_info
+
68 THREAD_SIZE
- 32 - sizeof(struct pt_regs
));
70 for (i
= 0; i
< 32; i
++)
71 __put_user (regs
->regs
[i
], data
+ i
);
72 __put_user (regs
->lo
, data
+ EF_LO
- EF_R0
);
73 __put_user (regs
->hi
, data
+ EF_HI
- EF_R0
);
74 __put_user (regs
->cp0_epc
, data
+ EF_CP0_EPC
- EF_R0
);
75 __put_user (regs
->cp0_badvaddr
, data
+ EF_CP0_BADVADDR
- EF_R0
);
76 __put_user (regs
->cp0_status
, data
+ EF_CP0_STATUS
- EF_R0
);
77 __put_user (regs
->cp0_cause
, data
+ EF_CP0_CAUSE
- EF_R0
);
83 * Write a general register set. As for PTRACE_GETREGS, we always use
84 * the 64-bit format. On a 32-bit kernel only the lower order half
85 * (according to endianness) will be used.
87 int ptrace_setregs (struct task_struct
*child
, __s64 __user
*data
)
92 if (!access_ok(VERIFY_READ
, data
, 38 * 8))
95 regs
= (struct pt_regs
*) ((unsigned long) child
->thread_info
+
96 THREAD_SIZE
- 32 - sizeof(struct pt_regs
));
98 for (i
= 0; i
< 32; i
++)
99 __get_user (regs
->regs
[i
], data
+ i
);
100 __get_user (regs
->lo
, data
+ EF_LO
- EF_R0
);
101 __get_user (regs
->hi
, data
+ EF_HI
- EF_R0
);
102 __get_user (regs
->cp0_epc
, data
+ EF_CP0_EPC
- EF_R0
);
104 /* badvaddr, status, and cause may not be written. */
109 int ptrace_getfpregs (struct task_struct
*child
, __u32 __user
*data
)
113 if (!access_ok(VERIFY_WRITE
, data
, 33 * 8))
116 if (tsk_used_math(child
)) {
117 fpureg_t
*fregs
= get_fpu_regs(child
);
118 for (i
= 0; i
< 32; i
++)
119 __put_user (fregs
[i
], i
+ (__u64 __user
*) data
);
121 for (i
= 0; i
< 32; i
++)
122 __put_user ((__u64
) -1, i
+ (__u64 __user
*) data
);
126 unsigned int flags
, tmp
;
128 __put_user (child
->thread
.fpu
.hard
.fcr31
, data
+ 64);
131 if (cpu_has_mipsmt
) {
132 unsigned int vpflags
= dvpe();
133 flags
= read_c0_status();
135 __asm__
__volatile__("cfc1\t%0,$0" : "=r" (tmp
));
136 write_c0_status(flags
);
139 flags
= read_c0_status();
141 __asm__
__volatile__("cfc1\t%0,$0" : "=r" (tmp
));
142 write_c0_status(flags
);
145 __put_user (tmp
, data
+ 65);
147 __put_user (child
->thread
.fpu
.soft
.fcr31
, data
+ 64);
148 __put_user ((__u32
) 0, data
+ 65);
154 int ptrace_setfpregs (struct task_struct
*child
, __u32 __user
*data
)
159 if (!access_ok(VERIFY_READ
, data
, 33 * 8))
162 fregs
= get_fpu_regs(child
);
164 for (i
= 0; i
< 32; i
++)
165 __get_user (fregs
[i
], i
+ (__u64 __user
*) data
);
168 __get_user (child
->thread
.fpu
.hard
.fcr31
, data
+ 64);
170 __get_user (child
->thread
.fpu
.soft
.fcr31
, data
+ 64);
172 /* FIR may not be written. */
177 asmlinkage
long sys_ptrace(long request
, long pid
, long addr
, long data
)
179 struct task_struct
*child
;
183 printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n",
184 (int) request
, (int) pid
, (unsigned long) addr
,
185 (unsigned long) data
);
189 if (request
== PTRACE_TRACEME
) {
190 /* are we already being traced? */
191 if (current
->ptrace
& PT_PTRACED
)
193 if ((ret
= security_ptrace(current
->parent
, current
)))
195 /* set the ptrace bit in the process flags. */
196 current
->ptrace
|= PT_PTRACED
;
201 read_lock(&tasklist_lock
);
202 child
= find_task_by_pid(pid
);
204 get_task_struct(child
);
205 read_unlock(&tasklist_lock
);
210 if (pid
== 1) /* you may not mess with init */
213 if (request
== PTRACE_ATTACH
) {
214 ret
= ptrace_attach(child
);
218 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
223 /* when I and D space are separate, these will need to be fixed. */
224 case PTRACE_PEEKTEXT
: /* read word at location addr. */
225 case PTRACE_PEEKDATA
: {
229 copied
= access_process_vm(child
, addr
, &tmp
, sizeof(tmp
), 0);
231 if (copied
!= sizeof(tmp
))
233 ret
= put_user(tmp
,(unsigned long __user
*) data
);
237 /* Read the word at location addr in the USER area. */
238 case PTRACE_PEEKUSR
: {
239 struct pt_regs
*regs
;
240 unsigned long tmp
= 0;
242 regs
= (struct pt_regs
*) ((unsigned long) child
->thread_info
+
243 THREAD_SIZE
- 32 - sizeof(struct pt_regs
));
244 ret
= 0; /* Default return value. */
248 tmp
= regs
->regs
[addr
];
250 case FPR_BASE
... FPR_BASE
+ 31:
251 if (tsk_used_math(child
)) {
252 fpureg_t
*fregs
= get_fpu_regs(child
);
256 * The odd registers are actually the high
257 * order bits of the values stored in the even
258 * registers - unless we're using r2k_switch.S.
261 tmp
= (unsigned long) (fregs
[((addr
& ~1) - 32)] >> 32);
263 tmp
= (unsigned long) (fregs
[(addr
- 32)] & 0xffffffff);
266 tmp
= fregs
[addr
- FPR_BASE
];
269 tmp
= -1; /* FP not yet used */
276 tmp
= regs
->cp0_cause
;
279 tmp
= regs
->cp0_badvaddr
;
289 tmp
= child
->thread
.fpu
.hard
.fcr31
;
291 tmp
= child
->thread
.fpu
.soft
.fcr31
;
293 case FPC_EIR
: { /* implementation / version register */
300 if (cpu_has_mipsmt
) {
301 unsigned int vpflags
= dvpe();
302 flags
= read_c0_status();
304 __asm__
__volatile__("cfc1\t%0,$0": "=r" (tmp
));
305 write_c0_status(flags
);
308 flags
= read_c0_status();
310 __asm__
__volatile__("cfc1\t%0,$0": "=r" (tmp
));
311 write_c0_status(flags
);
316 case DSP_BASE
... DSP_BASE
+ 5: {
324 if (child
->thread
.dsp
.used_dsp
) {
325 dregs
= __get_dsp_regs(child
);
326 tmp
= (unsigned long) (dregs
[addr
- DSP_BASE
]);
328 tmp
= -1; /* DSP registers yet used */
338 tmp
= child
->thread
.dsp
.dspcontrol
;
345 ret
= put_user(tmp
, (unsigned long __user
*) data
);
349 /* when I and D space are separate, this will have to be fixed. */
350 case PTRACE_POKETEXT
: /* write the word at location addr. */
351 case PTRACE_POKEDATA
:
353 if (access_process_vm(child
, addr
, &data
, sizeof(data
), 1)
359 case PTRACE_POKEUSR
: {
360 struct pt_regs
*regs
;
362 regs
= (struct pt_regs
*) ((unsigned long) child
->thread_info
+
363 THREAD_SIZE
- 32 - sizeof(struct pt_regs
));
367 regs
->regs
[addr
] = data
;
369 case FPR_BASE
... FPR_BASE
+ 31: {
370 fpureg_t
*fregs
= get_fpu_regs(child
);
372 if (!tsk_used_math(child
)) {
373 /* FP not yet used */
374 memset(&child
->thread
.fpu
.hard
, ~0,
375 sizeof(child
->thread
.fpu
.hard
));
376 child
->thread
.fpu
.hard
.fcr31
= 0;
380 * The odd registers are actually the high order bits
381 * of the values stored in the even registers - unless
382 * we're using r2k_switch.S.
385 fregs
[(addr
& ~1) - FPR_BASE
] &= 0xffffffff;
386 fregs
[(addr
& ~1) - FPR_BASE
] |= ((unsigned long long) data
) << 32;
388 fregs
[addr
- FPR_BASE
] &= ~0xffffffffLL
;
389 fregs
[addr
- FPR_BASE
] |= data
;
393 fregs
[addr
- FPR_BASE
] = data
;
398 regs
->cp0_epc
= data
;
408 child
->thread
.fpu
.hard
.fcr31
= data
;
410 child
->thread
.fpu
.soft
.fcr31
= data
;
412 case DSP_BASE
... DSP_BASE
+ 5: {
420 dregs
= __get_dsp_regs(child
);
421 dregs
[addr
- DSP_BASE
] = data
;
429 child
->thread
.dsp
.dspcontrol
= data
;
432 /* The rest are not allowed. */
440 ret
= ptrace_getregs (child
, (__u64 __user
*) data
);
444 ret
= ptrace_setregs (child
, (__u64 __user
*) data
);
447 case PTRACE_GETFPREGS
:
448 ret
= ptrace_getfpregs (child
, (__u32 __user
*) data
);
451 case PTRACE_SETFPREGS
:
452 ret
= ptrace_setfpregs (child
, (__u32 __user
*) data
);
455 case PTRACE_SYSCALL
: /* continue and stop at next (return from) syscall */
456 case PTRACE_CONT
: { /* restart after signal. */
458 if (!valid_signal(data
))
460 if (request
== PTRACE_SYSCALL
) {
461 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
464 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
466 child
->exit_code
= data
;
467 wake_up_process(child
);
473 * make the child exit. Best I can do is send it a sigkill.
474 * perhaps it should be put in the status that it wants to
479 if (child
->exit_state
== EXIT_ZOMBIE
) /* already dead */
481 child
->exit_code
= SIGKILL
;
482 wake_up_process(child
);
485 case PTRACE_DETACH
: /* detach a process that was attached. */
486 ret
= ptrace_detach(child
, data
);
489 case PTRACE_GET_THREAD_AREA
:
490 ret
= put_user(child
->thread_info
->tp_value
,
491 (unsigned long __user
*) data
);
495 ret
= ptrace_request(child
, request
, addr
, data
);
500 put_task_struct(child
);
506 static inline int audit_arch(void)
510 arch
|= __AUDIT_ARCH_64BIT
;
512 #if defined(__LITTLE_ENDIAN)
513 arch
|= __AUDIT_ARCH_LE
;
519 * Notification of system call entry/exit
520 * - triggered by current->work.syscall_trace
522 asmlinkage
void do_syscall_trace(struct pt_regs
*regs
, int entryexit
)
524 if (unlikely(current
->audit_context
) && entryexit
)
525 audit_syscall_exit(current
, AUDITSC_RESULT(regs
->regs
[2]),
528 if (!(current
->ptrace
& PT_PTRACED
))
530 if (!test_thread_flag(TIF_SYSCALL_TRACE
))
533 /* The 0x80 provides a way for the tracing parent to distinguish
534 between a syscall stop and SIGTRAP delivery */
535 ptrace_notify(SIGTRAP
| ((current
->ptrace
& PT_TRACESYSGOOD
) ?
539 * this isn't the same as continuing with a signal, but it will do
540 * for normal use. strace only continues with a signal if the
541 * stopping signal is not SIGTRAP. -brl
543 if (current
->exit_code
) {
544 send_sig(current
->exit_code
, current
, 1);
545 current
->exit_code
= 0;
548 if (unlikely(current
->audit_context
) && !entryexit
)
549 audit_syscall_entry(current
, audit_arch(), regs
->regs
[2],
550 regs
->regs
[4], regs
->regs
[5],
551 regs
->regs
[6], regs
->regs
[7]);