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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/cris/arch-v10/kernel/ptrace.c
2 * Copyright (C) 2000-2003, Axis Communications AB.
5 #include <linux/kernel.h>
6 #include <linux/sched.h>
9 #include <linux/errno.h>
10 #include <linux/ptrace.h>
11 #include <linux/user.h>
12 #include <linux/signal.h>
13 #include <linux/security.h>
15 #include <asm/uaccess.h>
17 #include <asm/pgtable.h>
18 #include <asm/system.h>
19 #include <asm/processor.h>
22 * Determines which bits in DCCR the user has access to.
23 * 1 = access, 0 = no access.
25 #define DCCR_MASK 0x0000001f /* XNZVC */
28 * Get contents of register REGNO in task TASK.
30 inline long get_reg(struct task_struct
*task
, unsigned int regno
)
32 /* USP is a special case, it's not in the pt_regs struct but
33 * in the tasks thread struct
37 return task
->thread
.usp
;
38 else if (regno
< PT_MAX
)
39 return ((unsigned long *)task_pt_regs(task
))[regno
];
45 * Write contents of register REGNO in task TASK.
47 inline int put_reg(struct task_struct
*task
, unsigned int regno
,
51 task
->thread
.usp
= data
;
52 else if (regno
< PT_MAX
)
53 ((unsigned long *)task_pt_regs(task
))[regno
] = data
;
60 * Called by kernel/ptrace.c when detaching.
62 * Make sure the single step bit is not set.
65 ptrace_disable(struct task_struct
*child
)
67 /* Todo - pending singlesteps? */
71 * Note that this implementation of ptrace behaves differently from vanilla
72 * ptrace. Contrary to what the man page says, in the PTRACE_PEEKTEXT,
73 * PTRACE_PEEKDATA, and PTRACE_PEEKUSER requests the data variable is not
74 * ignored. Instead, the data variable is expected to point at a location
75 * (in user space) where the result of the ptrace call is written (instead of
78 long arch_ptrace(struct task_struct
*child
, long request
, long addr
, long data
)
81 unsigned long __user
*datap
= (unsigned long __user
*)data
;
84 /* Read word at location address. */
87 ret
= generic_ptrace_peekdata(child
, addr
, data
);
90 /* Read the word at location address in the USER area. */
91 case PTRACE_PEEKUSR
: {
95 if ((addr
& 3) || addr
< 0 || addr
> PT_MAX
<< 2)
98 tmp
= get_reg(child
, addr
>> 2);
99 ret
= put_user(tmp
, datap
);
103 /* Write the word at location address. */
104 case PTRACE_POKETEXT
:
105 case PTRACE_POKEDATA
:
108 if (access_process_vm(child
, addr
, &data
, sizeof(data
), 1) == sizeof(data
))
114 /* Write the word at location address in the USER area. */
117 if ((addr
& 3) || addr
< 0 || addr
> PT_MAX
<< 2)
122 if (addr
== PT_DCCR
) {
123 /* don't allow the tracing process to change stuff like
124 * interrupt enable, kernel/user bit, dma enables etc.
127 data
|= get_reg(child
, PT_DCCR
) & ~DCCR_MASK
;
129 if (put_reg(child
, addr
, data
))
138 if (!valid_signal(data
))
141 if (request
== PTRACE_SYSCALL
) {
142 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
145 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
148 child
->exit_code
= data
;
150 /* TODO: make sure any pending breakpoint is killed */
151 wake_up_process(child
);
156 /* Make the child exit by sending it a sigkill. */
160 if (child
->exit_state
== EXIT_ZOMBIE
)
163 child
->exit_code
= SIGKILL
;
165 /* TODO: make sure any pending breakpoint is killed */
166 wake_up_process(child
);
169 /* Set the trap flag. */
170 case PTRACE_SINGLESTEP
:
173 if (!valid_signal(data
))
176 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
178 /* TODO: set some clever breakpoint mechanism... */
180 child
->exit_code
= data
;
181 wake_up_process(child
);
186 ret
= ptrace_detach(child
, data
);
189 /* Get all GP registers from the child. */
190 case PTRACE_GETREGS
: {
195 for (i
= 0; i
<= PT_MAX
; i
++) {
196 tmp
= get_reg(child
, i
);
198 if (put_user(tmp
, datap
)) {
203 data
+= sizeof(long);
209 /* Set all GP registers in the child. */
210 case PTRACE_SETREGS
: {
215 for (i
= 0; i
<= PT_MAX
; i
++) {
216 if (get_user(tmp
, datap
)) {
223 tmp
|= get_reg(child
, PT_DCCR
) & ~DCCR_MASK
;
226 put_reg(child
, i
, tmp
);
227 data
+= sizeof(long);
234 ret
= ptrace_request(child
, request
, addr
, data
);
241 void do_syscall_trace(void)
243 if (!test_thread_flag(TIF_SYSCALL_TRACE
))
246 if (!(current
->ptrace
& PT_PTRACED
))
249 /* the 0x80 provides a way for the tracing parent to distinguish
250 between a syscall stop and SIGTRAP delivery */
251 ptrace_notify(SIGTRAP
| ((current
->ptrace
& PT_TRACESYSGOOD
)
255 * This isn't the same as continuing with a signal, but it will do for
258 if (current
->exit_code
) {
259 send_sig(current
->exit_code
, current
, 1);
260 current
->exit_code
= 0;