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
|
/*
* crt0.S -- startup file for hppa on RTEMS
*
* $Id$
*/
.COPYRIGHT "crt0.S for hppa"
.DATA
_progname .STRINGZ "simhppa"
_crt0_argv .WORD _progname, 0
/*
* Set up the standard spaces (sections) These definitions come
* from /lib/pcc_prefix.s.
*/
.TEXT
/*
* stuff we need that is defined elsewhere.
*/
.IMPORT boot_card, CODE
.IMPORT _bss_start, DATA
.IMPORT _bss_end, DATA
.IMPORT environ, DATA
/*
* start -- set things up so the application will run.
*
*/
.PROC
.CALLINFO SAVE_SP, FRAME=48
.EXPORT $START$,ENTRY
.EXPORT start,ENTRY
$START$
start:
/*
* Get a stack
*/
ldil L%crt_stack+48,%r30
ldo R%crt_stack+48(%r30),%r30
/*
* we need to set %r27 (global data pointer) here
*/
ldil L%$global$,%r27
ldo R%$global$(%r27),%r27
/*
* zerobss -- zero out the bss section
* XXX We don't do this since simulator and boot rom will do this for us.
*/
#if 0
; load the start of bss
ldil L%_bss_start,%r4
ldo R%_bss_start(%r4),%r4
; load the end of bss
ldil L%_bss_end,%r5
ldo R%_bss_end(%r5),%r5
bssloop
addi -1,%r5,%r5 ; decrement _bss_end
stb %r0,0(0,%r5) ; we do this by bytes for now even
; though it is slower, it is safer
combf,= %r4,%r5, bssloop
nop
#endif
ldi 1,%ret0
/*
* Call the "boot_card" routine from the application to get it going.
* We call it as boot_card(1, argv, 0)
*/
copy %r0, %r24
ldil L%_crt0_argv,%r25
ldo R%_crt0_argv(%r25),%r25
bl boot_card,%r2
ldo 1(%r0), %r26
.PROCEND
/*
* _exit -- Exit from the application. Normally we cause a user trap
* to return to the ROM monitor for another run, but with
* this monitor we can not. Still, "C" wants this symbol, it
* should be here. Jumping to 0xF0000004 jumps back into the
* firmware, while writing a 5 to 0xFFFE0030 causes a reset.
*/
_exit_fallthru
.PROC
.CALLINFO
.ENTRY
;; This just causes a breakpoint exception
break 0x0,0x0
bv,n (%rp)
nop
.EXIT
.PROCEND
/*
* _sr4export -- support for called functions. (mostly for GDB)
*/
.EXPORT _sr4export, ENTRY
_sr4export:
.PROC
.CALLINFO
.ENTRY
ble 0(%sr4,%r22)
copy %r31,%rp
ldw -18(%sr0,%sp),%rp
ldsid (%sr0,%rp),%r1
mtsp %r1,%sr0
be,n 0(%sr0,%rp)
nop
.EXIT
.PROCEND
.subspa $UNWIND_START$,QUAD=0,ALIGN=8,ACCESS=0x2c,SORT=56
.export $UNWIND_START
$UNWIND_START
.subspa $UNWIND$,QUAD=0,ALIGN=8,ACCESS=0x2c,SORT=64
.subspa $UNWIND_END$,QUAD=0,ALIGN=8,ACCESS=0x2c,SORT=72
.export $UNWIND_END
$UNWIND_END
.subspa $RECOVER_START$,QUAD=0,ALIGN=4,ACCESS=0x2c,SORT=73
.export $RECOVER_START
$RECOVER_START
.subspa $RECOVER$,QUAD=0,ALIGN=4,ACCESS=0x2c,SORT=80
.subspa $RECOVER_END$,QUAD=0,ALIGN=4,ACCESS=0x2c,SORT=88
.export $RECOVER_END
$RECOVER_END
/*
* Here we set up the standard date sub spaces.
*
* Set up some room for a stack. We just grab a chunk of memory.
* We also setup some space for the global variable space, which
* must be done using the reserved name "$global$" so "C" code
* can find it. The stack grows towards the higher addresses.
*/
.subspa $DATA$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=16
.subspa $SHORTDATA$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=24
.subspa $GLOBAL$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=40
.export $global$
$global$
.subspa $SHORTBSS$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=80,ZERO
.subspa $BSS$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=82,ZERO
.subspa $STACK$,QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=88,ZERO
.export crt_stack
crt_stack
.comm 0x1000
.end
|
