-
Notifications
You must be signed in to change notification settings - Fork 16
/
context.c
138 lines (119 loc) · 2.98 KB
/
context.c
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
/* Copyright (c) 2005-2006 Russ Cox, MIT; see COPYRIGHT */
#include "taskimpl.h"
#if defined(__APPLE__)
#if defined(__i386__)
#define NEEDX86MAKECONTEXT
#define NEEDSWAPCONTEXT
#elif defined(__x86_64__)
#define NEEDAMD64MAKECONTEXT
#define NEEDSWAPCONTEXT
#else
#define NEEDPOWERMAKECONTEXT
#define NEEDSWAPCONTEXT
#endif
#endif
#if defined(__FreeBSD__) && defined(__i386__) && __FreeBSD__ < 5
#define NEEDX86MAKECONTEXT
#define NEEDSWAPCONTEXT
#endif
#if defined(__OpenBSD__) && defined(__i386__)
#define NEEDX86MAKECONTEXT
#define NEEDSWAPCONTEXT
#endif
#if defined(__linux__) && defined(__arm__)
#define NEEDSWAPCONTEXT
#define NEEDARMMAKECONTEXT
#endif
#if defined(__linux__) && defined(__mips__)
#define NEEDSWAPCONTEXT
#define NEEDMIPSMAKECONTEXT
#endif
#ifdef NEEDPOWERMAKECONTEXT
void
makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
{
ulong *sp, *tos;
va_list arg;
tos = (ulong*)ucp->uc_stack.ss_sp+ucp->uc_stack.ss_size/sizeof(ulong);
sp = tos - 16;
ucp->mc.pc = (long)func;
ucp->mc.sp = (long)sp;
va_start(arg, argc);
ucp->mc.r3 = va_arg(arg, long);
va_end(arg);
}
#endif
#ifdef NEEDX86MAKECONTEXT
void
makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
{
int *sp;
sp = (int*)ucp->uc_stack.ss_sp+ucp->uc_stack.ss_size/4;
sp -= argc;
sp = (void*)((uintptr_t)sp - (uintptr_t)sp%16); /* 16-align for OS X */
memmove(sp, &argc+1, argc*sizeof(int));
*--sp = 0; /* return address */
ucp->uc_mcontext.mc_eip = (long)func;
ucp->uc_mcontext.mc_esp = (int)sp;
}
#endif
#ifdef NEEDAMD64MAKECONTEXT
void
makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
{
long *sp;
va_list va;
memset(&ucp->uc_mcontext, 0, sizeof ucp->uc_mcontext);
if(argc != 2)
*(int*)0 = 0;
va_start(va, argc);
ucp->uc_mcontext.mc_rdi = va_arg(va, int);
ucp->uc_mcontext.mc_rsi = va_arg(va, int);
va_end(va);
sp = (long*)ucp->uc_stack.ss_sp+ucp->uc_stack.ss_size/sizeof(long);
sp -= argc;
sp = (void*)((uintptr_t)sp - (uintptr_t)sp%16); /* 16-align for OS X */
*--sp = 0; /* return address */
ucp->uc_mcontext.mc_rip = (long)func;
ucp->uc_mcontext.mc_rsp = (long)sp;
}
#endif
#ifdef NEEDARMMAKECONTEXT
void
makecontext(ucontext_t *uc, void (*fn)(void), int argc, ...)
{
int i, *sp;
va_list arg;
sp = (int*)uc->uc_stack.ss_sp+uc->uc_stack.ss_size/4;
va_start(arg, argc);
for(i=0; i<4 && i<argc; i++)
uc->uc_mcontext.gregs[i] = va_arg(arg, uint);
va_end(arg);
uc->uc_mcontext.gregs[13] = (uint)sp;
uc->uc_mcontext.gregs[14] = (uint)fn;
}
#endif
#ifdef NEEDMIPSMAKECONTEXT
void
makecontext(ucontext_t *uc, void (*fn)(void), int argc, ...)
{
int i, *sp;
va_list arg;
va_start(arg, argc);
sp = (int*)uc->uc_stack.ss_sp+uc->uc_stack.ss_size/4;
for(i=0; i<4 && i<argc; i++)
uc->uc_mcontext.mc_regs[i+4] = va_arg(arg, int);
va_end(arg);
uc->uc_mcontext.mc_regs[29] = (int)sp;
uc->uc_mcontext.mc_regs[31] = (int)fn;
}
#endif
#ifdef NEEDSWAPCONTEXT
int
swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
{
if(getcontext(oucp) == 0)
setcontext(ucp);
return 0;
}
#endif