74283369a1e3a768165cfa668ee1d18dc8476de7
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/pgtable.h>
38 #include <asm/system.h>
39 #include <asm/uaccess.h>
40 #include <asm/bootinfo.h>
43 * Called by kernel/ptrace.c when detaching..
45 * Make sure single step bits etc are not set.
47 void ptrace_disable(struct task_struct
*child
)
52 asmlinkage
int sys_ptrace(long request
, long pid
, long addr
, long data
)
54 struct task_struct
*child
;
58 printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n",
59 (int) request
, (int) pid
, (unsigned long) addr
,
60 (unsigned long) data
);
64 if (request
== PTRACE_TRACEME
) {
65 /* are we already being traced? */
66 if (current
->ptrace
& PT_PTRACED
)
68 if ((ret
= security_ptrace(current
->parent
, current
)))
70 /* set the ptrace bit in the process flags. */
71 current
->ptrace
|= PT_PTRACED
;
76 read_lock(&tasklist_lock
);
77 child
= find_task_by_pid(pid
);
79 get_task_struct(child
);
80 read_unlock(&tasklist_lock
);
85 if (pid
== 1) /* you may not mess with init */
88 if (request
== PTRACE_ATTACH
) {
89 ret
= ptrace_attach(child
);
93 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
98 /* when I and D space are separate, these will need to be fixed. */
99 case PTRACE_PEEKTEXT
: /* read word at location addr. */
100 case PTRACE_PEEKDATA
: {
104 copied
= access_process_vm(child
, addr
, &tmp
, sizeof(tmp
), 0);
106 if (copied
!= sizeof(tmp
))
108 ret
= put_user(tmp
,(unsigned long __user
*) data
);
112 /* Read the word at location addr in the USER area. */
113 case PTRACE_PEEKUSR
: {
114 struct pt_regs
*regs
;
115 unsigned long tmp
= 0;
117 regs
= (struct pt_regs
*) ((unsigned long) child
->thread_info
+
118 THREAD_SIZE
- 32 - sizeof(struct pt_regs
));
119 ret
= 0; /* Default return value. */
123 tmp
= regs
->regs
[addr
];
125 case FPR_BASE
... FPR_BASE
+ 31:
126 if (tsk_used_math(child
)) {
127 fpureg_t
*fregs
= get_fpu_regs(child
);
131 * The odd registers are actually the high
132 * order bits of the values stored in the even
133 * registers - unless we're using r2k_switch.S.
136 tmp
= (unsigned long) (fregs
[((addr
& ~1) - 32)] >> 32);
138 tmp
= (unsigned long) (fregs
[(addr
- 32)] & 0xffffffff);
141 tmp
= fregs
[addr
- FPR_BASE
];
144 tmp
= -1; /* FP not yet used */
151 tmp
= regs
->cp0_cause
;
154 tmp
= regs
->cp0_badvaddr
;
164 tmp
= child
->thread
.fpu
.hard
.fcr31
;
166 tmp
= child
->thread
.fpu
.soft
.fcr31
;
168 case FPC_EIR
: { /* implementation / version register */
174 flags
= read_c0_status();
176 __asm__
__volatile__("cfc1\t%0,$0": "=r" (tmp
));
177 write_c0_status(flags
);
180 case DSP_BASE
... DSP_BASE
+ 5: {
188 if (child
->thread
.dsp
.used_dsp
) {
189 dregs
= __get_dsp_regs(child
);
190 tmp
= (unsigned long) (dregs
[addr
- DSP_BASE
]);
192 tmp
= -1; /* DSP registers yet used */
202 tmp
= child
->thread
.dsp
.dspcontrol
;
209 ret
= put_user(tmp
, (unsigned long __user
*) data
);
213 /* when I and D space are separate, this will have to be fixed. */
214 case PTRACE_POKETEXT
: /* write the word at location addr. */
215 case PTRACE_POKEDATA
:
217 if (access_process_vm(child
, addr
, &data
, sizeof(data
), 1)
223 case PTRACE_POKEUSR
: {
224 struct pt_regs
*regs
;
226 regs
= (struct pt_regs
*) ((unsigned long) child
->thread_info
+
227 THREAD_SIZE
- 32 - sizeof(struct pt_regs
));
231 regs
->regs
[addr
] = data
;
233 case FPR_BASE
... FPR_BASE
+ 31: {
234 fpureg_t
*fregs
= get_fpu_regs(child
);
236 if (!tsk_used_math(child
)) {
237 /* FP not yet used */
238 memset(&child
->thread
.fpu
.hard
, ~0,
239 sizeof(child
->thread
.fpu
.hard
));
240 child
->thread
.fpu
.hard
.fcr31
= 0;
244 * The odd registers are actually the high order bits
245 * of the values stored in the even registers - unless
246 * we're using r2k_switch.S.
249 fregs
[(addr
& ~1) - FPR_BASE
] &= 0xffffffff;
250 fregs
[(addr
& ~1) - FPR_BASE
] |= ((unsigned long long) data
) << 32;
252 fregs
[addr
- FPR_BASE
] &= ~0xffffffffLL
;
253 fregs
[addr
- FPR_BASE
] |= data
;
257 fregs
[addr
- FPR_BASE
] = data
;
262 regs
->cp0_epc
= data
;
272 child
->thread
.fpu
.hard
.fcr31
= data
;
274 child
->thread
.fpu
.soft
.fcr31
= data
;
276 case DSP_BASE
... DSP_BASE
+ 5: {
284 dregs
= __get_dsp_regs(child
);
285 dregs
[addr
- DSP_BASE
] = data
;
293 child
->thread
.dsp
.dspcontrol
= data
;
296 /* The rest are not allowed. */
303 case PTRACE_SYSCALL
: /* continue and stop at next (return from) syscall */
304 case PTRACE_CONT
: { /* restart after signal. */
306 if (!valid_signal(data
))
308 if (request
== PTRACE_SYSCALL
) {
309 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
312 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
314 child
->exit_code
= data
;
315 wake_up_process(child
);
321 * make the child exit. Best I can do is send it a sigkill.
322 * perhaps it should be put in the status that it wants to
327 if (child
->exit_state
== EXIT_ZOMBIE
) /* already dead */
329 child
->exit_code
= SIGKILL
;
330 wake_up_process(child
);
333 case PTRACE_DETACH
: /* detach a process that was attached. */
334 ret
= ptrace_detach(child
, data
);
337 case PTRACE_GET_THREAD_AREA
:
338 ret
= put_user(child
->thread_info
->tp_value
,
339 (unsigned long __user
*) data
);
343 ret
= ptrace_request(child
, request
, addr
, data
);
348 put_task_struct(child
);
354 static inline int audit_arch(void)
358 arch
|= __AUDIT_ARCH_64BIT
;
360 #if defined(__LITTLE_ENDIAN)
361 arch
|= __AUDIT_ARCH_LE
;
367 * Notification of system call entry/exit
368 * - triggered by current->work.syscall_trace
370 asmlinkage
void do_syscall_trace(struct pt_regs
*regs
, int entryexit
)
372 if (unlikely(current
->audit_context
) && entryexit
)
373 audit_syscall_exit(current
, AUDITSC_RESULT(regs
->regs
[2]),
376 if (!(current
->ptrace
& PT_PTRACED
))
378 if (!test_thread_flag(TIF_SYSCALL_TRACE
))
381 /* The 0x80 provides a way for the tracing parent to distinguish
382 between a syscall stop and SIGTRAP delivery */
383 ptrace_notify(SIGTRAP
| ((current
->ptrace
& PT_TRACESYSGOOD
) ?
387 * this isn't the same as continuing with a signal, but it will do
388 * for normal use. strace only continues with a signal if the
389 * stopping signal is not SIGTRAP. -brl
391 if (current
->exit_code
) {
392 send_sig(current
->exit_code
, current
, 1);
393 current
->exit_code
= 0;
396 if (unlikely(current
->audit_context
) && !entryexit
)
397 audit_syscall_entry(current
, audit_arch(), regs
->regs
[2],
398 regs
->regs
[4], regs
->regs
[5],
399 regs
->regs
[6], regs
->regs
[7]);
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