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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
= task_pt_regs(child
);
69 for (i
= 0; i
< 32; i
++)
70 __put_user (regs
->regs
[i
], data
+ i
);
71 __put_user (regs
->lo
, data
+ EF_LO
- EF_R0
);
72 __put_user (regs
->hi
, data
+ EF_HI
- EF_R0
);
73 __put_user (regs
->cp0_epc
, data
+ EF_CP0_EPC
- EF_R0
);
74 __put_user (regs
->cp0_badvaddr
, data
+ EF_CP0_BADVADDR
- EF_R0
);
75 __put_user (regs
->cp0_status
, data
+ EF_CP0_STATUS
- EF_R0
);
76 __put_user (regs
->cp0_cause
, data
+ EF_CP0_CAUSE
- EF_R0
);
82 * Write a general register set. As for PTRACE_GETREGS, we always use
83 * the 64-bit format. On a 32-bit kernel only the lower order half
84 * (according to endianness) will be used.
86 int ptrace_setregs (struct task_struct
*child
, __s64 __user
*data
)
91 if (!access_ok(VERIFY_READ
, data
, 38 * 8))
94 regs
= task_pt_regs(child
);
96 for (i
= 0; i
< 32; i
++)
97 __get_user (regs
->regs
[i
], data
+ i
);
98 __get_user (regs
->lo
, data
+ EF_LO
- EF_R0
);
99 __get_user (regs
->hi
, data
+ EF_HI
- EF_R0
);
100 __get_user (regs
->cp0_epc
, data
+ EF_CP0_EPC
- EF_R0
);
102 /* badvaddr, status, and cause may not be written. */
107 int ptrace_getfpregs (struct task_struct
*child
, __u32 __user
*data
)
111 if (!access_ok(VERIFY_WRITE
, data
, 33 * 8))
114 if (tsk_used_math(child
)) {
115 fpureg_t
*fregs
= get_fpu_regs(child
);
116 for (i
= 0; i
< 32; i
++)
117 __put_user (fregs
[i
], i
+ (__u64 __user
*) data
);
119 for (i
= 0; i
< 32; i
++)
120 __put_user ((__u64
) -1, i
+ (__u64 __user
*) data
);
124 unsigned int flags
, tmp
;
126 __put_user (child
->thread
.fpu
.hard
.fcr31
, data
+ 64);
129 if (cpu_has_mipsmt
) {
130 unsigned int vpflags
= dvpe();
131 flags
= read_c0_status();
133 __asm__
__volatile__("cfc1\t%0,$0" : "=r" (tmp
));
134 write_c0_status(flags
);
137 flags
= read_c0_status();
139 __asm__
__volatile__("cfc1\t%0,$0" : "=r" (tmp
));
140 write_c0_status(flags
);
143 __put_user (tmp
, data
+ 65);
145 __put_user (child
->thread
.fpu
.soft
.fcr31
, data
+ 64);
146 __put_user ((__u32
) 0, data
+ 65);
152 int ptrace_setfpregs (struct task_struct
*child
, __u32 __user
*data
)
157 if (!access_ok(VERIFY_READ
, data
, 33 * 8))
160 fregs
= get_fpu_regs(child
);
162 for (i
= 0; i
< 32; i
++)
163 __get_user (fregs
[i
], i
+ (__u64 __user
*) data
);
166 __get_user (child
->thread
.fpu
.hard
.fcr31
, data
+ 64);
168 __get_user (child
->thread
.fpu
.soft
.fcr31
, data
+ 64);
170 /* FIR may not be written. */
175 long arch_ptrace(struct task_struct
*child
, long request
, long addr
, long data
)
180 /* when I and D space are separate, these will need to be fixed. */
181 case PTRACE_PEEKTEXT
: /* read word at location addr. */
182 case PTRACE_PEEKDATA
: {
186 copied
= access_process_vm(child
, addr
, &tmp
, sizeof(tmp
), 0);
188 if (copied
!= sizeof(tmp
))
190 ret
= put_user(tmp
,(unsigned long __user
*) data
);
194 /* Read the word at location addr in the USER area. */
195 case PTRACE_PEEKUSR
: {
196 struct pt_regs
*regs
;
197 unsigned long tmp
= 0;
199 regs
= task_pt_regs(child
);
200 ret
= 0; /* Default return value. */
204 tmp
= regs
->regs
[addr
];
206 case FPR_BASE
... FPR_BASE
+ 31:
207 if (tsk_used_math(child
)) {
208 fpureg_t
*fregs
= get_fpu_regs(child
);
212 * The odd registers are actually the high
213 * order bits of the values stored in the even
214 * registers - unless we're using r2k_switch.S.
217 tmp
= (unsigned long) (fregs
[((addr
& ~1) - 32)] >> 32);
219 tmp
= (unsigned long) (fregs
[(addr
- 32)] & 0xffffffff);
222 tmp
= fregs
[addr
- FPR_BASE
];
225 tmp
= -1; /* FP not yet used */
232 tmp
= regs
->cp0_cause
;
235 tmp
= regs
->cp0_badvaddr
;
245 tmp
= child
->thread
.fpu
.hard
.fcr31
;
247 tmp
= child
->thread
.fpu
.soft
.fcr31
;
249 case FPC_EIR
: { /* implementation / version register */
256 if (cpu_has_mipsmt
) {
257 unsigned int vpflags
= dvpe();
258 flags
= read_c0_status();
260 __asm__
__volatile__("cfc1\t%0,$0": "=r" (tmp
));
261 write_c0_status(flags
);
264 flags
= read_c0_status();
266 __asm__
__volatile__("cfc1\t%0,$0": "=r" (tmp
));
267 write_c0_status(flags
);
272 case DSP_BASE
... DSP_BASE
+ 5: {
280 dregs
= __get_dsp_regs(child
);
281 tmp
= (unsigned long) (dregs
[addr
- DSP_BASE
]);
290 tmp
= child
->thread
.dsp
.dspcontrol
;
297 ret
= put_user(tmp
, (unsigned long __user
*) data
);
301 /* when I and D space are separate, this will have to be fixed. */
302 case PTRACE_POKETEXT
: /* write the word at location addr. */
303 case PTRACE_POKEDATA
:
305 if (access_process_vm(child
, addr
, &data
, sizeof(data
), 1)
311 case PTRACE_POKEUSR
: {
312 struct pt_regs
*regs
;
314 regs
= task_pt_regs(child
);
318 regs
->regs
[addr
] = data
;
320 case FPR_BASE
... FPR_BASE
+ 31: {
321 fpureg_t
*fregs
= get_fpu_regs(child
);
323 if (!tsk_used_math(child
)) {
324 /* FP not yet used */
325 memset(&child
->thread
.fpu
.hard
, ~0,
326 sizeof(child
->thread
.fpu
.hard
));
327 child
->thread
.fpu
.hard
.fcr31
= 0;
331 * The odd registers are actually the high order bits
332 * of the values stored in the even registers - unless
333 * we're using r2k_switch.S.
336 fregs
[(addr
& ~1) - FPR_BASE
] &= 0xffffffff;
337 fregs
[(addr
& ~1) - FPR_BASE
] |= ((unsigned long long) data
) << 32;
339 fregs
[addr
- FPR_BASE
] &= ~0xffffffffLL
;
340 fregs
[addr
- FPR_BASE
] |= data
;
344 fregs
[addr
- FPR_BASE
] = data
;
349 regs
->cp0_epc
= data
;
359 child
->thread
.fpu
.hard
.fcr31
= data
;
361 child
->thread
.fpu
.soft
.fcr31
= data
;
363 case DSP_BASE
... DSP_BASE
+ 5: {
371 dregs
= __get_dsp_regs(child
);
372 dregs
[addr
- DSP_BASE
] = data
;
380 child
->thread
.dsp
.dspcontrol
= data
;
383 /* The rest are not allowed. */
391 ret
= ptrace_getregs (child
, (__u64 __user
*) data
);
395 ret
= ptrace_setregs (child
, (__u64 __user
*) data
);
398 case PTRACE_GETFPREGS
:
399 ret
= ptrace_getfpregs (child
, (__u32 __user
*) data
);
402 case PTRACE_SETFPREGS
:
403 ret
= ptrace_setfpregs (child
, (__u32 __user
*) data
);
406 case PTRACE_SYSCALL
: /* continue and stop at next (return from) syscall */
407 case PTRACE_CONT
: { /* restart after signal. */
409 if (!valid_signal(data
))
411 if (request
== PTRACE_SYSCALL
) {
412 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
415 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
417 child
->exit_code
= data
;
418 wake_up_process(child
);
424 * make the child exit. Best I can do is send it a sigkill.
425 * perhaps it should be put in the status that it wants to
430 if (child
->exit_state
== EXIT_ZOMBIE
) /* already dead */
432 child
->exit_code
= SIGKILL
;
433 wake_up_process(child
);
436 case PTRACE_DETACH
: /* detach a process that was attached. */
437 ret
= ptrace_detach(child
, data
);
440 case PTRACE_GET_THREAD_AREA
:
441 ret
= put_user(task_thread_info(child
)->tp_value
,
442 (unsigned long __user
*) data
);
446 ret
= ptrace_request(child
, request
, addr
, data
);
453 static inline int audit_arch(void)
457 arch
|= __AUDIT_ARCH_64BIT
;
459 #if defined(__LITTLE_ENDIAN)
460 arch
|= __AUDIT_ARCH_LE
;
466 * Notification of system call entry/exit
467 * - triggered by current->work.syscall_trace
469 asmlinkage
void do_syscall_trace(struct pt_regs
*regs
, int entryexit
)
471 if (unlikely(current
->audit_context
) && entryexit
)
472 audit_syscall_exit(current
, AUDITSC_RESULT(regs
->regs
[2]),
475 if (!(current
->ptrace
& PT_PTRACED
))
477 if (!test_thread_flag(TIF_SYSCALL_TRACE
))
480 /* The 0x80 provides a way for the tracing parent to distinguish
481 between a syscall stop and SIGTRAP delivery */
482 ptrace_notify(SIGTRAP
| ((current
->ptrace
& PT_TRACESYSGOOD
) ?
486 * this isn't the same as continuing with a signal, but it will do
487 * for normal use. strace only continues with a signal if the
488 * stopping signal is not SIGTRAP. -brl
490 if (current
->exit_code
) {
491 send_sig(current
->exit_code
, current
, 1);
492 current
->exit_code
= 0;
495 if (unlikely(current
->audit_context
) && !entryexit
)
496 audit_syscall_entry(current
, audit_arch(), regs
->regs
[2],
497 regs
->regs
[4], regs
->regs
[5],
498 regs
->regs
[6], regs
->regs
[7]);