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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - arch/mips/kernel/ptrace32.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/compiler.h>
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
21 #include <linux/errno.h>
22 #include <linux/ptrace.h>
23 #include <linux/smp.h>
24 #include <linux/smp_lock.h>
25 #include <linux/user.h>
26 #include <linux/security.h>
30 #include <asm/mipsregs.h>
31 #include <asm/pgtable.h>
33 #include <asm/system.h>
34 #include <asm/uaccess.h>
35 #include <asm/bootinfo.h>
38 * Tracing a 32-bit process with a 64-bit strace and vice versa will not
39 * work. I don't know how to fix this.
41 asmlinkage
int sys32_ptrace(int request
, int pid
, int addr
, int data
)
43 struct task_struct
*child
;
47 printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n",
48 (int) request
, (int) pid
, (unsigned long) addr
,
49 (unsigned long) data
);
53 if (request
== PTRACE_TRACEME
) {
54 /* are we already being traced? */
55 if (current
->ptrace
& PT_PTRACED
)
57 if ((ret
= security_ptrace(current
->parent
, current
)))
59 /* set the ptrace bit in the process flags. */
60 current
->ptrace
|= PT_PTRACED
;
65 read_lock(&tasklist_lock
);
66 child
= find_task_by_pid(pid
);
68 get_task_struct(child
);
69 read_unlock(&tasklist_lock
);
74 if (pid
== 1) /* you may not mess with init */
77 if (request
== PTRACE_ATTACH
) {
78 ret
= ptrace_attach(child
);
82 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
87 /* when I and D space are separate, these will need to be fixed. */
88 case PTRACE_PEEKTEXT
: /* read word at location addr. */
89 case PTRACE_PEEKDATA
: {
93 copied
= access_process_vm(child
, addr
, &tmp
, sizeof(tmp
), 0);
95 if (copied
!= sizeof(tmp
))
97 ret
= put_user(tmp
, (unsigned int *) (unsigned long) data
);
101 /* Read the word at location addr in the USER area. */
102 case PTRACE_PEEKUSR
: {
103 struct pt_regs
*regs
;
106 regs
= (struct pt_regs
*) ((unsigned long) child
->thread_info
+
107 THREAD_SIZE
- 32 - sizeof(struct pt_regs
));
108 ret
= 0; /* Default return value. */
112 tmp
= regs
->regs
[addr
];
114 case FPR_BASE
... FPR_BASE
+ 31:
115 if (tsk_used_math(child
)) {
116 fpureg_t
*fregs
= get_fpu_regs(child
);
119 * The odd registers are actually the high
120 * order bits of the values stored in the even
121 * registers - unless we're using r2k_switch.S.
124 tmp
= (unsigned long) (fregs
[((addr
& ~1) - 32)] >> 32);
126 tmp
= (unsigned long) (fregs
[(addr
- 32)] & 0xffffffff);
128 tmp
= -1; /* FP not yet used */
135 tmp
= regs
->cp0_cause
;
138 tmp
= regs
->cp0_badvaddr
;
148 tmp
= child
->thread
.fpu
.hard
.fcr31
;
150 tmp
= child
->thread
.fpu
.soft
.fcr31
;
152 case FPC_EIR
: { /* implementation / version register */
158 flags
= read_c0_status();
160 __asm__
__volatile__("cfc1\t%0,$0": "=r" (tmp
));
161 write_c0_status(flags
);
169 ret
= put_user(tmp
, (unsigned *) (unsigned long) data
);
173 /* when I and D space are separate, this will have to be fixed. */
174 case PTRACE_POKETEXT
: /* write the word at location addr. */
175 case PTRACE_POKEDATA
:
177 if (access_process_vm(child
, addr
, &data
, sizeof(data
), 1)
183 case PTRACE_POKEUSR
: {
184 struct pt_regs
*regs
;
186 regs
= (struct pt_regs
*) ((unsigned long) child
->thread_info
+
187 THREAD_SIZE
- 32 - sizeof(struct pt_regs
));
191 regs
->regs
[addr
] = data
;
193 case FPR_BASE
... FPR_BASE
+ 31: {
194 fpureg_t
*fregs
= get_fpu_regs(child
);
196 if (!tsk_used_math(child
)) {
197 /* FP not yet used */
198 memset(&child
->thread
.fpu
.hard
, ~0,
199 sizeof(child
->thread
.fpu
.hard
));
200 child
->thread
.fpu
.hard
.fcr31
= 0;
203 * The odd registers are actually the high order bits
204 * of the values stored in the even registers - unless
205 * we're using r2k_switch.S.
208 fregs
[(addr
& ~1) - FPR_BASE
] &= 0xffffffff;
209 fregs
[(addr
& ~1) - FPR_BASE
] |= ((unsigned long long) data
) << 32;
211 fregs
[addr
- FPR_BASE
] &= ~0xffffffffLL
;
212 /* Must cast, lest sign extension fill upper
214 fregs
[addr
- FPR_BASE
] |= (unsigned int)data
;
219 regs
->cp0_epc
= data
;
229 child
->thread
.fpu
.hard
.fcr31
= data
;
231 child
->thread
.fpu
.soft
.fcr31
= data
;
234 /* The rest are not allowed. */
241 case PTRACE_SYSCALL
: /* continue and stop at next (return from) syscall */
242 case PTRACE_CONT
: { /* restart after signal. */
244 if ((unsigned int) data
> _NSIG
)
246 if (request
== PTRACE_SYSCALL
) {
247 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
250 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
252 child
->exit_code
= data
;
253 wake_up_process(child
);
259 * make the child exit. Best I can do is send it a sigkill.
260 * perhaps it should be put in the status that it wants to
265 if (child
->exit_state
== EXIT_ZOMBIE
) /* already dead */
267 child
->exit_code
= SIGKILL
;
268 wake_up_process(child
);
271 case PTRACE_DETACH
: /* detach a process that was attached. */
272 ret
= ptrace_detach(child
, data
);
276 ret
= ptrace_request(child
, request
, addr
, data
);
281 put_task_struct(child
);