URL https://opencores.org/ocsvn/altor32/altor32/trunk

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[/] [altor32/] [trunk/] [sw/] [gdb_stub/] [boot.S] - Blame information for rev 43

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Line No.	Rev	Author	Line
1	43	ultra_embe	`.nodelay`
2
3			`#include "exception.inc"`
4
5			`#-------------------------------------------------------------`
6			`# VECTOR 0x100 - Reset`
7			`#-------------------------------------------------------------`
8			`.org 0x100`
9			`vector_reset:`
10
11			`# Setup SP (R1)`
12			`l.movhi r4,hi(_sp);`
13			`l.ori r1,r4,lo(_sp);`
14
15			`# R4 = _bss_start`
16			`l.movhi r4,hi(_bss_start);`
17			`l.ori r4,r4,lo(_bss_start);`
18
19			`# R5 = _bss_end`
20			`l.movhi r5,hi(_bss_end);`
21			`l.ori r5,r5,lo(_bss_end);`
22
23			`BSS_CLEAR:`
24			`l.sw 0x0(r4),r0 # Write 0x00 to mem[r4]`
25			`l.sfleu r4,r5 # SR[F] = (r4 < r5)`
26			`l.addi r4, r4, 4 # r4 += 4`
27			`l.bf BSS_CLEAR # If SR[F] == 0, jump to BSS_CLEAR`
28			`l.nop`
29
30			`# Jump to debug agent`
31			`l.j gdb_main`
32			`l.nop`
33
34			`.size vector_reset, .-vector_reset`
35
36			`#-------------------------------------------------------------`
37			`# VECTOR 0x200 - Fault / Illegal Instruction`
38			`#-------------------------------------------------------------`
39			`.org 0x200`
40			`vector_fault:`
41
42			`# Save context`
43			`asm_save_context`
44
45			`# Arg 2 = Fault`
46			`l.addi r4, r0, 1`
47
48			`l.j handle_exception`
49			`l.nop`
50
51			`.size vector_fault, .-vector_fault`
52
53			`#-------------------------------------------------------------`
54			`# VECTOR 0x300 - External Interrupt`
55			`#-------------------------------------------------------------`
56			`.org 0x300`
57			`vector_extint:`
58
59			`# Save context`
60			`asm_save_context`
61
62			`# Arg 2 = Ext Int`
63			`l.addi r4, r0, 2`
64
65			`l.j handle_exception`
66			`l.nop`
67
68			`.size vector_extint, .-vector_extint`
69
70			`#-------------------------------------------------------------`
71			`# VECTOR 0x400 - Syscall`
72			`#-------------------------------------------------------------`
73			`.org 0x400`
74			`vector_syscall:`
75
76			`# Save context`
77			`asm_save_context`
78
79			`# Arg 2 = Syscall`
80			`l.addi r4, r0, 3`
81
82			`l.j handle_exception`
83			`l.nop`
84
85			`.size vector_syscall, .-vector_syscall`
86
87			`#-------------------------------------------------------------`
88			`# VECTOR 0x600 - Trap`
89			`#-------------------------------------------------------------`
90			`.org 0x600`
91			`vector_trap:`
92
93			`# Save context`
94			`asm_save_context`
95
96			`# Arg 2 = Trap`
97			`l.addi r4, r0, 4`
98
99			`# Fall through...`
100
101			`.size vector_trap, .-vector_trap`
102
103			`#-------------------------------------------------------------`
104			`# handle_exception: Common exception handling code`
105			`#-------------------------------------------------------------`
106			`handle_exception:`
107
108			`# Copy stack pointer to arg1`
109			`l.add r3, r0, r1`
110
111			`# Jump to debug handler`
112			`l.movhi r10,hi(gdb_exception);`
113			`l.ori r10,r10,lo(gdb_exception);`
114			`l.jalr r10`
115			`l.nop`
116
117			`# Return value is stack pointer`
118			`l.add r1, r0, r11`
119
120			`# Restore context`
121			`asm_load_context`
122
123			`.size handle_exception, .-handle_exception`

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Subversion Repositories altor32

[/] [altor32/] [trunk/] [sw/] [gdb_stub/] [boot.S] - Blame information for rev 43