-
Notifications
You must be signed in to change notification settings - Fork 24
/
amd64.c
175 lines (156 loc) · 6.31 KB
/
amd64.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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
#define LIBCO_C
#include "libco.h"
#include "settings.h"
#ifdef __cplusplus
extern "C" {
#endif
static thread_local long long co_active_buffer[64];
static thread_local cothread_t co_active_handle = 0;
static void (*co_swap)(cothread_t, cothread_t) = 0;
#ifdef LIBCO_MPROTECT
alignas(4096)
#else
section(text)
#endif
#ifdef _WIN32
/* ABI: Win64 */
static const unsigned char co_swap_function[4096] = {
0x48, 0x89, 0x22, /* mov [rdx],rsp */
0x48, 0x8b, 0x21, /* mov rsp,[rcx] */
0x58, /* pop rax */
0x48, 0x89, 0x6a, 0x08, /* mov [rdx+ 8],rbp */
0x48, 0x89, 0x72, 0x10, /* mov [rdx+16],rsi */
0x48, 0x89, 0x7a, 0x18, /* mov [rdx+24],rdi */
0x48, 0x89, 0x5a, 0x20, /* mov [rdx+32],rbx */
0x4c, 0x89, 0x62, 0x28, /* mov [rdx+40],r12 */
0x4c, 0x89, 0x6a, 0x30, /* mov [rdx+48],r13 */
0x4c, 0x89, 0x72, 0x38, /* mov [rdx+56],r14 */
0x4c, 0x89, 0x7a, 0x40, /* mov [rdx+64],r15 */
#if !defined(LIBCO_NO_SSE)
0x0f, 0x29, 0x72, 0x50, /* movaps [rdx+ 80],xmm6 */
0x0f, 0x29, 0x7a, 0x60, /* movaps [rdx+ 96],xmm7 */
0x44, 0x0f, 0x29, 0x42, 0x70, /* movaps [rdx+112],xmm8 */
0x48, 0x83, 0xc2, 0x70, /* add rdx,112 */
0x44, 0x0f, 0x29, 0x4a, 0x10, /* movaps [rdx+ 16],xmm9 */
0x44, 0x0f, 0x29, 0x52, 0x20, /* movaps [rdx+ 32],xmm10 */
0x44, 0x0f, 0x29, 0x5a, 0x30, /* movaps [rdx+ 48],xmm11 */
0x44, 0x0f, 0x29, 0x62, 0x40, /* movaps [rdx+ 64],xmm12 */
0x44, 0x0f, 0x29, 0x6a, 0x50, /* movaps [rdx+ 80],xmm13 */
0x44, 0x0f, 0x29, 0x72, 0x60, /* movaps [rdx+ 96],xmm14 */
0x44, 0x0f, 0x29, 0x7a, 0x70, /* movaps [rdx+112],xmm15 */
#endif
0x48, 0x8b, 0x69, 0x08, /* mov rbp,[rcx+ 8] */
0x48, 0x8b, 0x71, 0x10, /* mov rsi,[rcx+16] */
0x48, 0x8b, 0x79, 0x18, /* mov rdi,[rcx+24] */
0x48, 0x8b, 0x59, 0x20, /* mov rbx,[rcx+32] */
0x4c, 0x8b, 0x61, 0x28, /* mov r12,[rcx+40] */
0x4c, 0x8b, 0x69, 0x30, /* mov r13,[rcx+48] */
0x4c, 0x8b, 0x71, 0x38, /* mov r14,[rcx+56] */
0x4c, 0x8b, 0x79, 0x40, /* mov r15,[rcx+64] */
#if !defined(LIBCO_NO_SSE)
0x0f, 0x28, 0x71, 0x50, /* movaps xmm6, [rcx+ 80] */
0x0f, 0x28, 0x79, 0x60, /* movaps xmm7, [rcx+ 96] */
0x44, 0x0f, 0x28, 0x41, 0x70, /* movaps xmm8, [rcx+112] */
0x48, 0x83, 0xc1, 0x70, /* add rcx,112 */
0x44, 0x0f, 0x28, 0x49, 0x10, /* movaps xmm9, [rcx+ 16] */
0x44, 0x0f, 0x28, 0x51, 0x20, /* movaps xmm10,[rcx+ 32] */
0x44, 0x0f, 0x28, 0x59, 0x30, /* movaps xmm11,[rcx+ 48] */
0x44, 0x0f, 0x28, 0x61, 0x40, /* movaps xmm12,[rcx+ 64] */
0x44, 0x0f, 0x28, 0x69, 0x50, /* movaps xmm13,[rcx+ 80] */
0x44, 0x0f, 0x28, 0x71, 0x60, /* movaps xmm14,[rcx+ 96] */
0x44, 0x0f, 0x28, 0x79, 0x70, /* movaps xmm15,[rcx+112] */
#endif
0xff, 0xe0, /* jmp rax */
};
/* Valgrind is available on MINGW but not on MSVC. */
#if defined(__GNUC__)
#include "valgrind.h"
#endif
#include <windows.h>
static void co_init(void) {
#ifdef LIBCO_MPROTECT
DWORD old_privileges;
VirtualProtect((void*)co_swap_function, sizeof co_swap_function, PAGE_EXECUTE_READ, &old_privileges);
#endif
}
#else
/* ABI: SystemV */
static const unsigned char co_swap_function[4096] = {
0x48, 0x89, 0x26, /* mov [rsi],rsp */
0x48, 0x8b, 0x27, /* mov rsp,[rdi] */
0x58, /* pop rax */
0x48, 0x89, 0x6e, 0x08, /* mov [rsi+ 8],rbp */
0x48, 0x89, 0x5e, 0x10, /* mov [rsi+16],rbx */
0x4c, 0x89, 0x66, 0x18, /* mov [rsi+24],r12 */
0x4c, 0x89, 0x6e, 0x20, /* mov [rsi+32],r13 */
0x4c, 0x89, 0x76, 0x28, /* mov [rsi+40],r14 */
0x4c, 0x89, 0x7e, 0x30, /* mov [rsi+48],r15 */
0x48, 0x8b, 0x6f, 0x08, /* mov rbp,[rdi+ 8] */
0x48, 0x8b, 0x5f, 0x10, /* mov rbx,[rdi+16] */
0x4c, 0x8b, 0x67, 0x18, /* mov r12,[rdi+24] */
0x4c, 0x8b, 0x6f, 0x20, /* mov r13,[rdi+32] */
0x4c, 0x8b, 0x77, 0x28, /* mov r14,[rdi+40] */
0x4c, 0x8b, 0x7f, 0x30, /* mov r15,[rdi+48] */
0xff, 0xe0, /* jmp rax */
};
#include "valgrind.h"
#ifdef LIBCO_MPROTECT
#include <unistd.h>
#include <sys/mman.h>
#endif
static void co_init(void) {
#ifdef LIBCO_MPROTECT
unsigned long long addr = (unsigned long long)co_swap_function;
unsigned long long base = addr - (addr % sysconf(_SC_PAGESIZE));
unsigned long long size = (addr - base) + sizeof co_swap_function;
mprotect((void*)base, size, PROT_READ | PROT_EXEC);
#endif
}
#endif
static void crash(void) {
LIBCO_ASSERT(0); /* called only if cothread_t entrypoint returns */
}
cothread_t co_active(void) {
if(!co_active_handle) co_active_handle = &co_active_buffer;
return co_active_handle;
}
cothread_t co_derive(void* memory, unsigned int size, void (*entrypoint)(void)) {
cothread_t handle;
if(!co_swap) {
co_init();
co_swap = (void (*)(cothread_t, cothread_t))co_swap_function;
}
if(!co_active_handle) co_active_handle = &co_active_buffer;
#if defined(__VALGRIND_MAJOR__)
VALGRIND_STACK_REGISTER(memory, memory + size);
#endif
if((handle = (cothread_t)memory)) {
unsigned long long stack_top = (unsigned long long)handle + size;
long long *p;
stack_top -= 32;
stack_top &= ~((unsigned long long) 15);
p = (long long*)(stack_top); /* seek to top of stack */
*--p = (long long)crash; /* crash if entrypoint returns */
*--p = (long long)entrypoint; /* start of function */
*(long long*)handle = (long long)p; /* stack pointer */
}
return handle;
}
cothread_t co_create(unsigned int size, void (*entrypoint)(void)) {
void* memory = LIBCO_MALLOC(size);
if(!memory) return (cothread_t)0;
return co_derive(memory, size, entrypoint);
}
void co_delete(cothread_t handle) {
LIBCO_FREE(handle);
}
void co_switch(cothread_t handle) {
register cothread_t co_previous_handle = co_active_handle;
co_swap(co_active_handle = handle, co_previous_handle);
}
int co_serializable(void) {
return 1;
}
#ifdef __cplusplus
}
#endif