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
|
#include "all.h"
char *gasloc, *gassym;
void
gasemitdat(Dat *d, FILE *f)
{
static int align;
static char *dtoa[] = {
[DAlign] = ".balign",
[DB] = "\t.byte",
[DH] = "\t.short",
[DW] = "\t.int",
[DL] = "\t.quad"
};
char *p;
switch (d->type) {
case DStart:
align = 0;
if (d->u.str) {
fprintf(f, ".section %s\n", d->u.str);
} else {
fprintf(f, ".data\n");
}
break;
case DEnd:
break;
case DName:
if (!align)
fprintf(f, ".balign 8\n");
p = d->u.str[0] == '"' ? "" : gassym;
if (d->export)
fprintf(f, ".globl %s%s\n", p, d->u.str);
fprintf(f, "%s%s:\n", p, d->u.str);
break;
case DZ:
fprintf(f, "\t.fill %"PRId64",1,0\n", d->u.num);
break;
default:
if (d->type == DAlign)
align = 1;
if (d->isstr) {
if (d->type != DB)
err("strings only supported for 'b' currently");
fprintf(f, "\t.ascii %s\n", d->u.str);
}
else if (d->isref) {
p = d->u.ref.nam[0] == '"' ? "" : gassym;
fprintf(f, "%s %s%s%+"PRId64"\n",
dtoa[d->type], p, d->u.ref.nam,
d->u.ref.off);
}
else {
fprintf(f, "%s %"PRId64"\n",
dtoa[d->type], d->u.num);
}
break;
}
}
typedef struct Asmbits Asmbits;
struct Asmbits {
char bits[16];
int size;
Asmbits *link;
};
static Asmbits *stash;
int
gasstash(void *bits, int size)
{
Asmbits **pb, *b;
int i;
assert(size == 4 || size == 8 || size == 16);
for (pb=&stash, i=0; (b=*pb); pb=&b->link, i++)
if (size <= b->size)
if (memcmp(bits, b->bits, size) == 0)
return i;
b = emalloc(sizeof *b);
memcpy(b->bits, bits, size);
b->size = size;
b->link = 0;
*pb = b;
return i;
}
void
gasemitfin(FILE *f)
{
Asmbits *b;
char *p;
int sz, i;
double d;
if (!stash)
return;
fprintf(f, "/* floating point constants */\n.data\n");
for (sz=16; sz>=4; sz/=2)
for (b=stash, i=0; b; b=b->link, i++) {
if (b->size == sz) {
fprintf(f,
".balign %d\n"
"%sfp%d:",
sz, gasloc, i
);
for (p=b->bits; p<&b->bits[sz]; p+=4)
fprintf(f, "\n\t.int %"PRId32,
*(int32_t *)p);
if (sz <= 8) {
if (sz == 4)
d = *(float *)b->bits;
else
d = *(double *)b->bits;
fprintf(f, " /* %f */\n", d);
} else
fprintf(f, "\n");
}
}
while ((b=stash)) {
stash = b->link;
free(b);
}
fprintf(f, ".section .note.GNU-stack,\"\",@progbits\n");
}
|
