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
|
/*
* This is based on the file srt0.s provided with the binary
* distribution of the SPARC Instruction Simulator (SIS) found
* at ftp://ftp.estec.esa.nl/pub/ws/wsd/erc32.
*/
#include "asm.h"
.data
.align 8
SYM(environ):
.long 0
.text
.globl SYM(start)
SYM(start):
sethi %hi(__stack), %g1
or %g1,%lo(__stack),%g1
mov %g1, %sp ! set the stack pointer
mov %sp, %fp
/* clear the bss */
sethi %hi(__bss_start),%g2
or %g2,%lo(__bss_start),%g2 ! start of bss
sethi %hi(_end),%g3
or %g3,%lo(_end),%g3 ! end of bss
mov %g0,%g1 ! so std has two zeros
zerobss:
std %g0,[%g2]
add %g2,8,%g2
cmp %g2,%g3
bleu,a zerobss
nop
/* move data segment to proper location */
#if 0
relocd:
set (_endtext),%g2 ! g2 = start of data in aout file
set (_environ),%g4 ! g4 = start of where data should go
set (_edata),%g3 ! g3 = end of where data should go
subcc %g3, %g4, %g5 ! g5 = length of data
subcc %g4, %g2, %g0 ! need to relocate data ?
ble initok
ld [%g4], %g6
subcc %g6, 1, %g0
be initok
mvdata:
subcc %g5, 8, %g5
ldd [%g2 + %g5], %g6
bg mvdata
std %g6, [%g4 + %g5]
initok:
#endif
call SYM(__fix_ctors)
nop
call SYM(main)
nop
/* call exit from the C library so atexit gets called, and the
* C++ destructors get run. This calls our exit routine below * when it's done.
*/
call SYM(exit)
nop
.globl SYM(_exit)
SYM(_exit):
set 0xdeadd00d, %o1 ! Magic number for simulator.
ta 0 ! Halt if _main returns ...
nop
|
