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
|
/*
* vobj.c - identify and parse a mips object file
*/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mach.h>
#include "vc/v.out.h"
#include "obj.h"
typedef struct Addr Addr;
struct Addr
{
char type;
char sym;
char name;
};
static Addr addr(Biobuf*);
static char type2char(int);
static void skip(Biobuf*, int);
int
_isv(char *s)
{
return s[0] == ANAME /* ANAME */
&& s[1] == D_FILE /* type */
&& s[2] == 1 /* sym */
&& s[3] == '<'; /* name of file */
}
int
_readv(Biobuf *bp, Prog *p)
{
int as, n;
Addr a;
as = Bgetc(bp); /* as */
if(as < 0)
return 0;
p->kind = aNone;
p->sig = 0;
if(as == ANAME || as == ASIGNAME){
if(as == ASIGNAME){
Bread(bp, &p->sig, 4);
p->sig = leswal(p->sig);
}
p->kind = aName;
p->type = type2char(Bgetc(bp)); /* type */
p->sym = Bgetc(bp); /* sym */
n = 0;
for(;;) {
as = Bgetc(bp);
if(as < 0)
return 0;
n++;
if(as == 0)
break;
}
p->id = malloc(n);
if(p->id == 0)
return 0;
Bseek(bp, -n, 1);
if(Bread(bp, p->id, n) != n)
return 0;
return 1;
}
if(as == ATEXT)
p->kind = aText;
else if(as == AGLOBL)
p->kind = aData;
skip(bp, 5); /* reg(1), lineno(4) */
a = addr(bp);
addr(bp);
if(a.type != D_OREG || a.name != D_STATIC && a.name != D_EXTERN)
p->kind = aNone;
p->sym = a.sym;
return 1;
}
static Addr
addr(Biobuf *bp)
{
Addr a;
long off;
a.type = Bgetc(bp); /* a.type */
skip(bp,1); /* reg */
a.sym = Bgetc(bp); /* sym index */
a.name = Bgetc(bp); /* sym type */
switch(a.type){
default:
case D_NONE: case D_REG: case D_FREG: case D_MREG:
case D_FCREG: case D_LO: case D_HI:
break;
case D_OREG:
case D_CONST:
case D_BRANCH:
off = Bgetc(bp);
off |= Bgetc(bp) << 8;
off |= Bgetc(bp) << 16;
off |= Bgetc(bp) << 24;
if(off < 0)
off = -off;
if(a.sym && (a.name==D_PARAM || a.name==D_AUTO))
_offset(a.sym, off);
break;
case D_SCONST:
skip(bp, NSNAME);
break;
case D_FCONST:
skip(bp, 8);
break;
}
return a;
}
static char
type2char(int t)
{
switch(t){
case D_EXTERN: return 'U';
case D_STATIC: return 'b';
case D_AUTO: return 'a';
case D_PARAM: return 'p';
default: return UNKNOWN;
}
}
static void
skip(Biobuf *bp, int n)
{
while (n-- > 0)
Bgetc(bp);
}
|
