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
|
#include "obj.h"
#include "common.h"
#include "ir.h"
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
void elfinit(void);
void elfaddsym(const char *, int info, enum section, uvlong value, uvlong size);
void elfreloc(const char *sym, enum relockind, enum section, uint off, vlong addend);
void elffini(struct wbuf *);
struct objfile objout;
enum { NTEXT = 4<<20 /* 4MiB */ };
void
objini(const char *file)
{
assert(!objout.file);
objout.file = file;
objout.code = objout.textbegin = mapzeros(NTEXT);
objout.textend = objout.textbegin + NTEXT;
switch (mctarg->objkind) {
case OBJELF: elfinit(); break;
}
}
void
objdeffunc(const char *nam, bool globl, uint off, uint siz)
{
switch (mctarg->objkind) {
case OBJELF:
elfaddsym(nam, /*STT_LOCAL/GLOBAL*/globl << 4 | /*STT_FUNC*/2, Stext, off, siz);
break;
}
}
uint
objnewdat(const char *name, enum section sec, bool globl, uint siz, uint align)
{
uint off;
assert(siz && align && ispo2(align));
switch (sec) {
default: assert(0);
case Srodata:
if (align > objout.rodataalign) objout.rodataalign = align;
while (objout.rodata.n & (align - 1)) vpush(&objout.rodata, 0);
off = objout.rodata.n;
vresize(&objout.rodata, objout.rodata.n + siz);
memset(objout.rodata.p+off, 0, siz);
break;
case Sdata:
if (align > objout.dataalign) objout.dataalign = align;
while (objout.data.n & (align - 1)) vpush(&objout.data, 0);
off = objout.data.n;
vresize(&objout.data, objout.data.n + siz);
memset(objout.data.p+off, 0, siz);
break;
case Sbss:
if (align > objout.bssalign) objout.bssalign = align;
off = alignup(objout.nbss, align);
objout.nbss = off + siz;
break;
}
switch (mctarg->objkind) {
case OBJELF:
elfaddsym(name, /*STT_LOCAL/GLOBAL*/globl<<4 | /*STT_OBJECT*/1, sec, off, siz);
break;
}
return off;
}
void
objreloc(const char *sym, enum relockind reloc, enum section section, uint off, vlong addend)
{
switch (mctarg->objkind) {
case OBJELF:
elfreloc(sym, reloc, section, off, addend);
break;
}
}
void
objfini(void)
{
static char buf[1<<12];
struct wbuf out = FDBUF(buf, sizeof buf, open(objout.file, O_WRONLY | O_CREAT | O_TRUNC, 0666));
if (out.fd < 0) fatal(NULL, "could not open %'s for writing: %s", objout.file, strerror(errno));
switch (mctarg->objkind) {
case OBJELF: elffini(&out); break;
}
munmap(objout.textbegin, NTEXT);
ioflush(&out);
close(out.fd);
}
/* vim:set ts=3 sw=3 expandtab: */
|
