1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Port on Texas Instruments TMS320C6x architecture
*
* Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
*
* Updated for 2.6.34: Mark Salter <msalter@redhat.com>
*/
#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/regset.h>
#include <linux/elf.h>
#include <linux/sched/task_stack.h>
#include <asm/cacheflush.h>
#define PT_REG_SIZE (sizeof(struct pt_regs))
/*
* Called by kernel/ptrace.c when detaching.
*/
void ptrace_disable(struct task_struct *child)
{
/* nothing to do */
}
/*
* Get a register number from live pt_regs for the specified task.
*/
static inline long get_reg(struct task_struct *task, int regno)
{
long *addr = (long *)task_pt_regs(task);
if (regno == PT_TSR || regno == PT_CSR)
return 0;
return addr[regno];
}
/*
* Write contents of register REGNO in task TASK.
*/
static inline int put_reg(struct task_struct *task,
int regno,
unsigned long data)
{
unsigned long *addr = (unsigned long *)task_pt_regs(task);
if (regno != PT_TSR && regno != PT_CSR)
addr[regno] = data;
return 0;
}
/* regset get/set implementations */
static int gpr_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
return membuf_write(&to, task_pt_regs(target), sizeof(struct pt_regs));
}
enum c6x_regset {
REGSET_GPR,
};
static const struct user_regset c6x_regsets[] = {
[REGSET_GPR] = {
.core_note_type = NT_PRSTATUS,
.n = ELF_NGREG,
.size = sizeof(u32),
.align = sizeof(u32),
.regset_get = gpr_get,
},
};
static const struct user_regset_view user_c6x_native_view = {
.name = "tic6x",
.e_machine = EM_TI_C6000,
.regsets = c6x_regsets,
.n = ARRAY_SIZE(c6x_regsets),
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &user_c6x_native_view;
}
/*
* Perform ptrace request
*/
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
int ret = 0;
switch (request) {
/*
* write the word at location addr.
*/
case PTRACE_POKETEXT:
ret = generic_ptrace_pokedata(child, addr, data);
if (ret == 0 && request == PTRACE_POKETEXT)
flush_icache_range(addr, addr + 4);
break;
default:
ret = ptrace_request(child, request, addr, data);
break;
}
return ret;
}
/*
* handle tracing of system call entry
* - return the revised system call number or ULONG_MAX to cause ENOSYS
*/
asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs)
{
if (tracehook_report_syscall_entry(regs))
/* tracing decided this syscall should not happen, so
* We'll return a bogus call number to get an ENOSYS
* error, but leave the original number in
* regs->orig_a4
*/
return ULONG_MAX;
return regs->b0;
}
/*
* handle tracing of system call exit
*/
asmlinkage void syscall_trace_exit(struct pt_regs *regs)
{
tracehook_report_syscall_exit(regs, 0);
}
|
