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[/] [openrisc/] [trunk/] [orpsocv2/] [sw/] [drivers/] [or1200/] [crt0.S] - Blame information for rev 522

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#include "spr-defs.h"
#include "board.h"
 
/* ======================================================= [ macros ] === */
 
#define REDZONE 128
#define EXCEPTION_STACK_SIZE (128 + REDZONE)
 
#define CLEAR_GPR(gpr) \
        l.or    gpr, r0, r0
 
#define ENTRY(symbol)    \
        .global symbol ; \
symbol:
 
#define LOAD_SYMBOL_2_GPR(gpr,symbol)  \
        .global symbol ;               \
        l.movhi gpr, hi(symbol) ;      \
        l.ori   gpr, gpr, lo(symbol)
 
        // Really goes to configurable interrupt handler
#define EXCEPTION_HANDLER            \
        l.addi  r1, r1, -EXCEPTION_STACK_SIZE;          \
        l.sw    4(r1), r3;             \
        l.sw    8(r1), r4;             \
        l.mfspr r3,r0,SPR_NPC;          \
        l.mfspr r4,r0,SPR_EPCR_BASE;   \
        l.j default_exception_handler; \
        l.nop
 
/* =================================================== [ exceptions ] === */
        .section .vectors, "ax"
 
/* ---[ 0x100: RESET exception ]----------------------------------------- */
        .org 0x100
        l.movhi r0, 0
        l.movhi r1, 0
        l.movhi r2, 0
        l.movhi r3, 0
        l.movhi r4, 0
        l.movhi r5, 0
        l.movhi r6, 0
        l.movhi r7, 0
        l.movhi r8, 0
        l.movhi r9, 0
        l.movhi r10, 0
        l.movhi r11, 0
        l.movhi r12, 0
        l.movhi r13, 0
        l.movhi r14, 0
        l.movhi r15, 0
        l.movhi r16, 0
        l.movhi r17, 0
        l.movhi r18, 0
        l.movhi r19, 0
        l.movhi r20, 0
        l.movhi r21, 0
        l.movhi r22, 0
        l.movhi r23, 0
        l.movhi r24, 0
        l.movhi r25, 0
        l.movhi r26, 0
        l.movhi r27, 0
        l.movhi r28, 0
        l.movhi r29, 0
        l.movhi r30, 0
        l.movhi r31, 0
        /* Clear status register, set supervisor mode */
        l.ori r1, r0, SPR_SR_SM
        l.mtspr r0, r1, SPR_SR
        /* Clear timer  */
        l.mtspr r0, r0, SPR_TTMR
        /* Early Stack initilization */
        LOAD_SYMBOL_2_GPR(r1, _stack)
        l.addi  r2, r0, -3
        l.and   r1, r1, r2
 
        /* Jump to program initialisation code */
        LOAD_SYMBOL_2_GPR(r4, _start)
        l.jr    r4
        l.nop
 
/* ---[ 0x200: BUS exception ]------------------------------------------- */
        .org 0x200
        EXCEPTION_HANDLER
 
/* ---[ 0x300: Data Page Fault exception ]------------------------------- */
        .org 0x300
        EXCEPTION_HANDLER
 
/* ---[ 0x400: Insn Page Fault exception ]------------------------------- */
        .org 0x400
        EXCEPTION_HANDLER
 
/* ---[ 0x500: Timer exception ]----------------------------------------- */
        .org 0x500
        EXCEPTION_HANDLER
 
/* ---[ 0x600: Aligment exception ]-------------------------------------- */
        .org 0x600
        EXCEPTION_HANDLER
 
/* ---[ 0x700: Illegal insn exception ]---------------------------------- */
        .org 0x700
        EXCEPTION_HANDLER
 
/* ---[ 0x800: External interrupt exception ]---------------------------- */
        .org 0x800
        EXCEPTION_HANDLER
 
/* ---[ 0x900: DTLB miss exception ]------------------------------------- */
        .org 0x900
        EXCEPTION_HANDLER
 
/* ---[ 0xa00: ITLB miss exception ]------------------------------------- */
        .org 0xa00
        EXCEPTION_HANDLER
 
/* ---[ 0xb00: Range exception ]----------------------------------------- */
        .org 0xb00
        EXCEPTION_HANDLER
 
/* ---[ 0xc00: Syscall exception ]--------------------------------------- */
        .org 0xc00
        EXCEPTION_HANDLER
 
/* ---[ 0xd00: FPU exception ]------------------------------------------- */
        .org 0xd00
        EXCEPTION_HANDLER
 
/* ---[ 0xe00: Trap exception ]------------------------------------------ */
        .org 0xe00
        EXCEPTION_HANDLER
 
/* ---[ 0xf00 - 0x1400: Reserved exceptions ]---------------------------- */
/*
        .org 0xf00
        EXCEPTION_HANDLER
 
        .org 0x1000
        EXCEPTION_HANDLER
 
        .org 0x1100
        EXCEPTION_HANDLER
 
        .org 0x1200
        EXCEPTION_HANDLER
 
        .org 0x1300
        EXCEPTION_HANDLER
 
        .org 0x1400
        EXCEPTION_HANDLER
 
*/
/* ---[ 0x1500 - 0x1800: Implementation-specific exceptions ]------------ */
/*
        .org 0x1500
        EXCEPTION_HANDLER
 
        .org 0x1600
        EXCEPTION_HANDLER
 
        .org 0x1700
        EXCEPTION_HANDLER
 
        .org 0x1800
        EXCEPTION_HANDLER
*/
/* ---[ 0x1500 - 0x1F00: Custom exceptions ]----------------------------- */
/*
        .org 0x1900
        EXCEPTION_HANDLER
 
        .org 0x1a00
        EXCEPTION_HANDLER
 
        .org 0x1b00
        EXCEPTION_HANDLER
 
        .org 0x1c00
        EXCEPTION_HANDLER
 
        .org 0x1d00
        EXCEPTION_HANDLER
 
        .org 0x1e00
        EXCEPTION_HANDLER
 
        .org 0x1f00
        EXCEPTION_HANDLER
*/
 
/* ========================================================= [ entry ] === */
        .section .text
 
ENTRY(_start)
 
 
 
        /* Instruction cache enable */
        /* Check if IC present and skip enabling otherwise */
        l.mfspr r24,r0,SPR_UPR
        l.andi  r26,r24,SPR_UPR_ICP
        l.sfeq  r26,r0
        l.bf    .L8
        l.nop
 
        /* Disable IC */
        l.mfspr r6,r0,SPR_SR
        l.addi  r5,r0,-1
        l.xori  r5,r5,SPR_SR_ICE
        l.and   r5,r6,r5
        l.mtspr r0,r5,SPR_SR
 
        /* Establish cache block size
        If BS=0, 16;
        If BS=1, 32;
        r14 contain block size
        */
        l.mfspr r24,r0,SPR_ICCFGR
        l.andi  r26,r24,SPR_ICCFGR_CBS
        l.srli  r28,r26,7
        l.ori   r30,r0,16
        l.sll   r14,r30,r28
 
        /* Establish number of cache sets
        r16 contains number of cache sets
        r28 contains log(# of cache sets)
        */
        l.andi  r26,r24,SPR_ICCFGR_NCS
        l.srli  r28,r26,3
        l.ori   r30,r0,1
        l.sll   r16,r30,r28
 
        /* Invalidate IC */
        l.addi  r6,r0,0
        l.sll   r5,r14,r28
 
.L7:
        l.mtspr r0,r6,SPR_ICBIR
        l.sfne  r6,r5
        l.bf    .L7
        l.add   r6,r6,r14
 
        /* Enable IC */
        l.mfspr r6,r0,SPR_SR
        l.ori   r6,r6,SPR_SR_ICE
        l.mtspr r0,r6,SPR_SR
        l.nop
        l.nop
        l.nop
        l.nop
        l.nop
        l.nop
        l.nop
        l.nop
 
.L8:
        /* Data cache enable */
        /* Check if DC present and skip enabling otherwise */
        l.mfspr r24,r0,SPR_UPR
        l.andi  r26,r24,SPR_UPR_DCP
        l.sfeq  r26,r0
        l.bf    .L10
        l.nop
        /* Disable DC */
        l.mfspr r6,r0,SPR_SR
        l.addi  r5,r0,-1
        l.xori  r5,r5,SPR_SR_DCE
        l.and   r5,r6,r5
        l.mtspr r0,r5,SPR_SR
        /* Establish cache block size
           If BS=0, 16;
           If BS=1, 32;
           r14 contain block size
        */
        l.mfspr r24,r0,SPR_DCCFGR
        l.andi  r26,r24,SPR_DCCFGR_CBS
        l.srli  r28,r26,7
        l.ori   r30,r0,16
        l.sll   r14,r30,r28
        /* Establish number of cache sets
           r16 contains number of cache sets
           r28 contains log(# of cache sets)
        */
        l.andi  r26,r24,SPR_DCCFGR_NCS
        l.srli  r28,r26,3
        l.ori   r30,r0,1
        l.sll   r16,r30,r28
        /* Invalidate DC */
        l.addi  r6,r0,0
        l.sll   r5,r14,r28
.L9:
        l.mtspr r0,r6,SPR_DCBIR
        l.sfne  r6,r5
        l.bf    .L9
        l.add   r6,r6,r14
        /* Enable DC */
        l.mfspr r6,r0,SPR_SR
        l.ori   r6,r6,SPR_SR_DCE
        l.mtspr r0,r6,SPR_SR
 
.L10:
 
        /* Clear BSS */
        LOAD_SYMBOL_2_GPR(r28, _bss_start)
        LOAD_SYMBOL_2_GPR(r30, _bss_end)
1:
        l.sw    (0)(r28), r0
        l.sfltu r28, r30
        l.bf    1b
        l.addi  r28, r28, 4
 
        /* Initialise UART in a C function */
        /*l.jal    _uart_init
        l.nop*/
 
        /* Jump to main program entry point (argc = argv = 0) */
        CLEAR_GPR(r3)
        CLEAR_GPR(r4)
        l.jal   main
        l.nop
 
        /* If program exits, call exit routine */
        l.addi  r3, r11, 0
        l.jal   exit
        l.nop
 
 
/* ====================================== [ default exception handler ] === */
 
default_exception_handler:
        l.sw    0x00(r1), r2
        l.sw    0x0c(r1), r5
        l.sw    0x10(r1), r6
        l.sw    0x14(r1), r7
        l.sw    0x18(r1), r8
        l.sw    0x1c(r1), r9
        l.sw    0x20(r1), r10
        l.sw    0x24(r1), r11
        l.sw    0x28(r1), r12
        l.sw    0x2c(r1), r13
        l.sw    0x30(r1), r14
        l.sw    0x34(r1), r15
        l.sw    0x38(r1), r16
        l.sw    0x3c(r1), r17
        l.sw    0x40(r1), r18
        l.sw    0x44(r1), r19
        l.sw    0x48(r1), r20
        l.sw    0x4c(r1), r21
        l.sw    0x50(r1), r22
        l.sw    0x54(r1), r23
        l.sw    0x58(r1), r24
        l.sw    0x5c(r1), r25
        l.sw    0x60(r1), r26
        l.sw    0x64(r1), r27
        l.sw    0x68(r1), r28
        l.sw    0x6c(r1), r29
        l.sw    0x70(r1), r30
        l.sw    0x74(r1), r31
        l.sw    0x78(r1), r32
 
        l.jal   default_exception_handler_c
        l.nop
 
        l.lwz    r2, 0x00(r1)
        l.lwz    r3, 0x04(r1)
        l.lwz    r4, 0x08(r1)
        l.lwz    r5, 0x0c(r1)
        l.lwz    r6, 0x10(r1)
        l.lwz    r7, 0x14(r1)
        l.lwz    r8, 0x18(r1)
        l.lwz    r9, 0x1c(r1)
        l.lwz    r10, 0x20(r1)
        l.lwz    r11, 0x24(r1)
        l.lwz    r12, 0x28(r1)
        l.lwz    r13, 0x2c(r1)
        l.lwz    r14, 0x30(r1)
        l.lwz    r15, 0x34(r1)
        l.lwz    r16, 0x38(r1)
        l.lwz    r17, 0x3c(r1)
        l.lwz    r18, 0x40(r1)
        l.lwz    r19, 0x44(r1)
        l.lwz    r20, 0x48(r1)
        l.lwz    r21, 0x4c(r1)
        l.lwz    r22, 0x50(r1)
        l.lwz    r23, 0x54(r1)
        l.lwz    r24, 0x58(r1)
        l.lwz    r25, 0x5c(r1)
        l.lwz    r26, 0x60(r1)
        l.lwz    r27, 0x64(r1)
        l.lwz    r28, 0x68(r1)
        l.lwz    r29, 0x6c(r1)
        l.lwz    r30, 0x70(r1)
        l.lwz    r31, 0x74(r1)
        l.lwz    r32, 0x78(r1)
 
        l.addi  r1, r1, EXCEPTION_STACK_SIZE
 
        l.rfe
        l.nop
 

Line No.	Rev	Author	Line
1	349	julius	`#include "spr-defs.h"`
2			`#include "board.h"`
3
4			`/* ======================================================= [ macros ] === */`
5
6	470	julius	`#define REDZONE 128`
7			`#define EXCEPTION_STACK_SIZE (128 + REDZONE)`
8
9	349	julius	`#define CLEAR_GPR(gpr) \`
10			`l.or gpr, r0, r0`
11
12			`#define ENTRY(symbol) \`
13			`.global symbol ; \`
14			`symbol:`
15
16			`#define LOAD_SYMBOL_2_GPR(gpr,symbol) \`
17			`.global symbol ; \`
18			`l.movhi gpr, hi(symbol) ; \`
19			`l.ori gpr, gpr, lo(symbol)`
20
21			`// Really goes to configurable interrupt handler`
22	470	julius	`#define EXCEPTION_HANDLER \`
23			`l.addi r1, r1, -EXCEPTION_STACK_SIZE; \`
24	349	julius	`l.sw 4(r1), r3; \`
25			`l.sw 8(r1), r4; \`
26			`l.mfspr r3,r0,SPR_NPC; \`
27			`l.mfspr r4,r0,SPR_EPCR_BASE; \`
28			`l.j default_exception_handler; \`
29			`l.nop`
30
31			`/* =================================================== [ exceptions ] === */`
32			`.section .vectors, "ax"`
33
34			`/* ---[ 0x100: RESET exception ]----------------------------------------- */`
35			`.org 0x100`
36			`l.movhi r0, 0`
37	485	julius	`l.movhi r1, 0`
38			`l.movhi r2, 0`
39			`l.movhi r3, 0`
40			`l.movhi r4, 0`
41			`l.movhi r5, 0`
42			`l.movhi r6, 0`
43			`l.movhi r7, 0`
44			`l.movhi r8, 0`
45			`l.movhi r9, 0`
46			`l.movhi r10, 0`
47			`l.movhi r11, 0`
48			`l.movhi r12, 0`
49			`l.movhi r13, 0`
50			`l.movhi r14, 0`
51			`l.movhi r15, 0`
52			`l.movhi r16, 0`
53			`l.movhi r17, 0`
54			`l.movhi r18, 0`
55			`l.movhi r19, 0`
56			`l.movhi r20, 0`
57			`l.movhi r21, 0`
58			`l.movhi r22, 0`
59			`l.movhi r23, 0`
60			`l.movhi r24, 0`
61			`l.movhi r25, 0`
62			`l.movhi r26, 0`
63			`l.movhi r27, 0`
64			`l.movhi r28, 0`
65			`l.movhi r29, 0`
66			`l.movhi r30, 0`
67			`l.movhi r31, 0`
68	349	julius	`/* Clear status register, set supervisor mode */`
69			`l.ori r1, r0, SPR_SR_SM`
70			`l.mtspr r0, r1, SPR_SR`
71			`/* Clear timer */`
72			`l.mtspr r0, r0, SPR_TTMR`
73			`/* Early Stack initilization */`
74			`LOAD_SYMBOL_2_GPR(r1, _stack)`
75			`l.addi r2, r0, -3`
76			`l.and r1, r1, r2`
77
78			`/* Jump to program initialisation code */`
79			`LOAD_SYMBOL_2_GPR(r4, _start)`
80			`l.jr r4`
81			`l.nop`
82
83			`/* ---[ 0x200: BUS exception ]------------------------------------------- */`
84			`.org 0x200`
85	470	julius	`EXCEPTION_HANDLER`
86	349	julius
87			`/* ---[ 0x300: Data Page Fault exception ]------------------------------- */`
88			`.org 0x300`
89	470	julius	`EXCEPTION_HANDLER`
90	349	julius
91			`/* ---[ 0x400: Insn Page Fault exception ]------------------------------- */`
92			`.org 0x400`
93	470	julius	`EXCEPTION_HANDLER`
94	349	julius
95			`/* ---[ 0x500: Timer exception ]----------------------------------------- */`
96			`.org 0x500`
97	488	julius	`EXCEPTION_HANDLER`
98
99	349	julius	`/* ---[ 0x600: Aligment exception ]-------------------------------------- */`
100			`.org 0x600`
101	470	julius	`EXCEPTION_HANDLER`
102	349	julius
103			`/* ---[ 0x700: Illegal insn exception ]---------------------------------- */`
104			`.org 0x700`
105	470	julius	`EXCEPTION_HANDLER`
106	349	julius
107			`/* ---[ 0x800: External interrupt exception ]---------------------------- */`
108			`.org 0x800`
109	470	julius	`EXCEPTION_HANDLER`
110	349	julius
111			`/* ---[ 0x900: DTLB miss exception ]------------------------------------- */`
112			`.org 0x900`
113	470	julius	`EXCEPTION_HANDLER`
114	349	julius
115			`/* ---[ 0xa00: ITLB miss exception ]------------------------------------- */`
116			`.org 0xa00`
117	470	julius	`EXCEPTION_HANDLER`
118
119	349	julius	`/* ---[ 0xb00: Range exception ]----------------------------------------- */`
120			`.org 0xb00`
121	470	julius	`EXCEPTION_HANDLER`
122	349	julius
123			`/* ---[ 0xc00: Syscall exception ]--------------------------------------- */`
124			`.org 0xc00`
125	470	julius	`EXCEPTION_HANDLER`
126	349	julius
127	470	julius	`/* ---[ 0xd00: FPU exception ]------------------------------------------- */`
128	349	julius	`.org 0xd00`
129	470	julius	`EXCEPTION_HANDLER`
130	349	julius
131			`/* ---[ 0xe00: Trap exception ]------------------------------------------ */`
132			`.org 0xe00`
133	470	julius	`EXCEPTION_HANDLER`
134	349	julius
135	470	julius	`/* ---[ 0xf00 - 0x1400: Reserved exceptions ]---------------------------- */`
136			`/*`
137	349	julius	`.org 0xf00`
138	470	julius	`EXCEPTION_HANDLER`
139
140	349	julius	`.org 0x1000`
141	470	julius	`EXCEPTION_HANDLER`
142	349	julius
143			`.org 0x1100`
144	470	julius	`EXCEPTION_HANDLER`
145	349	julius
146			`.org 0x1200`
147	470	julius	`EXCEPTION_HANDLER`
148	349	julius
149			`.org 0x1300`
150	470	julius	`EXCEPTION_HANDLER`
151	349	julius
152			`.org 0x1400`
153	470	julius	`EXCEPTION_HANDLER`
154	349	julius
155	470	julius	`*/`
156			`/* ---[ 0x1500 - 0x1800: Implementation-specific exceptions ]------------ */`
157			`/*`
158	349	julius	`.org 0x1500`
159	470	julius	`EXCEPTION_HANDLER`
160	349	julius
161			`.org 0x1600`
162	470	julius	`EXCEPTION_HANDLER`
163	349	julius
164			`.org 0x1700`
165	470	julius	`EXCEPTION_HANDLER`
166	349	julius
167			`.org 0x1800`
168	470	julius	`EXCEPTION_HANDLER`
169			`*/`
170			`/* ---[ 0x1500 - 0x1F00: Custom exceptions ]----------------------------- */`
171			`/*`
172	349	julius	`.org 0x1900`
173	470	julius	`EXCEPTION_HANDLER`
174	349	julius
175			`.org 0x1a00`
176	470	julius	`EXCEPTION_HANDLER`
177	349	julius
178			`.org 0x1b00`
179	470	julius	`EXCEPTION_HANDLER`
180	349	julius
181			`.org 0x1c00`
182	470	julius	`EXCEPTION_HANDLER`
183	349	julius
184			`.org 0x1d00`
185	470	julius	`EXCEPTION_HANDLER`
186	349	julius
187			`.org 0x1e00`
188	470	julius	`EXCEPTION_HANDLER`
189	349	julius
190			`.org 0x1f00`
191	470	julius	`EXCEPTION_HANDLER`
192	349	julius	`*/`
193
194			`/* ========================================================= [ entry ] === */`
195			`.section .text`
196
197			`ENTRY(_start)`
198
199	489	julius
200
201	349	julius	`/* Instruction cache enable */`
202			`/* Check if IC present and skip enabling otherwise */`
203			`l.mfspr r24,r0,SPR_UPR`
204			`l.andi r26,r24,SPR_UPR_ICP`
205			`l.sfeq r26,r0`
206			`l.bf .L8`
207			`l.nop`
208
209			`/* Disable IC */`
210			`l.mfspr r6,r0,SPR_SR`
211			`l.addi r5,r0,-1`
212			`l.xori r5,r5,SPR_SR_ICE`
213			`l.and r5,r6,r5`
214			`l.mtspr r0,r5,SPR_SR`
215
216			`/* Establish cache block size`
217			`If BS=0, 16;`
218			`If BS=1, 32;`
219			`r14 contain block size`
220			`*/`
221			`l.mfspr r24,r0,SPR_ICCFGR`
222			`l.andi r26,r24,SPR_ICCFGR_CBS`
223			`l.srli r28,r26,7`
224			`l.ori r30,r0,16`
225			`l.sll r14,r30,r28`
226
227			`/* Establish number of cache sets`
228			`r16 contains number of cache sets`
229			`r28 contains log(# of cache sets)`
230			`*/`
231			`l.andi r26,r24,SPR_ICCFGR_NCS`
232			`l.srli r28,r26,3`
233			`l.ori r30,r0,1`
234			`l.sll r16,r30,r28`
235
236			`/* Invalidate IC */`
237			`l.addi r6,r0,0`
238			`l.sll r5,r14,r28`
239
240			`.L7:`
241			`l.mtspr r0,r6,SPR_ICBIR`
242			`l.sfne r6,r5`
243			`l.bf .L7`
244			`l.add r6,r6,r14`
245
246			`/* Enable IC */`
247			`l.mfspr r6,r0,SPR_SR`
248			`l.ori r6,r6,SPR_SR_ICE`
249			`l.mtspr r0,r6,SPR_SR`
250			`l.nop`
251			`l.nop`
252			`l.nop`
253			`l.nop`
254			`l.nop`
255			`l.nop`
256			`l.nop`
257			`l.nop`
258
259			`.L8:`
260			`/* Data cache enable */`
261			`/* Check if DC present and skip enabling otherwise */`
262			`l.mfspr r24,r0,SPR_UPR`
263			`l.andi r26,r24,SPR_UPR_DCP`
264			`l.sfeq r26,r0`
265			`l.bf .L10`
266			`l.nop`
267			`/* Disable DC */`
268			`l.mfspr r6,r0,SPR_SR`
269			`l.addi r5,r0,-1`
270			`l.xori r5,r5,SPR_SR_DCE`
271			`l.and r5,r6,r5`
272			`l.mtspr r0,r5,SPR_SR`
273			`/* Establish cache block size`
274			`If BS=0, 16;`
275			`If BS=1, 32;`
276			`r14 contain block size`
277			`*/`
278			`l.mfspr r24,r0,SPR_DCCFGR`
279			`l.andi r26,r24,SPR_DCCFGR_CBS`
280			`l.srli r28,r26,7`
281			`l.ori r30,r0,16`
282			`l.sll r14,r30,r28`
283			`/* Establish number of cache sets`
284			`r16 contains number of cache sets`
285			`r28 contains log(# of cache sets)`
286			`*/`
287			`l.andi r26,r24,SPR_DCCFGR_NCS`
288			`l.srli r28,r26,3`
289			`l.ori r30,r0,1`
290			`l.sll r16,r30,r28`
291			`/* Invalidate DC */`
292			`l.addi r6,r0,0`
293			`l.sll r5,r14,r28`
294			`.L9:`
295			`l.mtspr r0,r6,SPR_DCBIR`
296			`l.sfne r6,r5`
297			`l.bf .L9`
298			`l.add r6,r6,r14`
299			`/* Enable DC */`
300			`l.mfspr r6,r0,SPR_SR`
301			`l.ori r6,r6,SPR_SR_DCE`
302			`l.mtspr r0,r6,SPR_SR`
303
304			`.L10:`
305
306			`/* Clear BSS */`
307	475	julius	`LOAD_SYMBOL_2_GPR(r28, _bss_start)`
308			`LOAD_SYMBOL_2_GPR(r30, _bss_end)`
309	349	julius	`1:`
310			`l.sw (0)(r28), r0`
311			`l.sfltu r28, r30`
312			`l.bf 1b`
313			`l.addi r28, r28, 4`
314
315			`/* Initialise UART in a C function */`
316			`/*l.jal _uart_init`
317			`l.nop*/`
318
319			`/* Jump to main program entry point (argc = argv = 0) */`
320			`CLEAR_GPR(r3)`
321			`CLEAR_GPR(r4)`
322	373	julius	`l.jal main`
323	349	julius	`l.nop`
324
325			`/* If program exits, call exit routine */`
326			`l.addi r3, r11, 0`
327	373	julius	`l.jal exit`
328	349	julius	`l.nop`
329
330
331			`/* ====================================== [ default exception handler ] === */`
332
333			`default_exception_handler:`
334			`l.sw 0x00(r1), r2`
335			`l.sw 0x0c(r1), r5`
336			`l.sw 0x10(r1), r6`
337			`l.sw 0x14(r1), r7`
338			`l.sw 0x18(r1), r8`
339			`l.sw 0x1c(r1), r9`
340			`l.sw 0x20(r1), r10`
341			`l.sw 0x24(r1), r11`
342			`l.sw 0x28(r1), r12`
343			`l.sw 0x2c(r1), r13`
344			`l.sw 0x30(r1), r14`
345			`l.sw 0x34(r1), r15`
346			`l.sw 0x38(r1), r16`
347			`l.sw 0x3c(r1), r17`
348			`l.sw 0x40(r1), r18`
349			`l.sw 0x44(r1), r19`
350			`l.sw 0x48(r1), r20`
351			`l.sw 0x4c(r1), r21`
352			`l.sw 0x50(r1), r22`
353			`l.sw 0x54(r1), r23`
354			`l.sw 0x58(r1), r24`
355			`l.sw 0x5c(r1), r25`
356			`l.sw 0x60(r1), r26`
357			`l.sw 0x64(r1), r27`
358			`l.sw 0x68(r1), r28`
359			`l.sw 0x6c(r1), r29`
360			`l.sw 0x70(r1), r30`
361			`l.sw 0x74(r1), r31`
362			`l.sw 0x78(r1), r32`
363
364	373	julius	`l.jal default_exception_handler_c`
365	349	julius	`l.nop`
366
367			`l.lwz r2, 0x00(r1)`
368			`l.lwz r3, 0x04(r1)`
369			`l.lwz r4, 0x08(r1)`
370			`l.lwz r5, 0x0c(r1)`
371			`l.lwz r6, 0x10(r1)`
372			`l.lwz r7, 0x14(r1)`
373			`l.lwz r8, 0x18(r1)`
374			`l.lwz r9, 0x1c(r1)`
375			`l.lwz r10, 0x20(r1)`
376			`l.lwz r11, 0x24(r1)`
377			`l.lwz r12, 0x28(r1)`
378			`l.lwz r13, 0x2c(r1)`
379			`l.lwz r14, 0x30(r1)`
380			`l.lwz r15, 0x34(r1)`
381			`l.lwz r16, 0x38(r1)`
382			`l.lwz r17, 0x3c(r1)`
383			`l.lwz r18, 0x40(r1)`
384			`l.lwz r19, 0x44(r1)`
385			`l.lwz r20, 0x48(r1)`
386			`l.lwz r21, 0x4c(r1)`
387			`l.lwz r22, 0x50(r1)`
388			`l.lwz r23, 0x54(r1)`
389			`l.lwz r24, 0x58(r1)`
390			`l.lwz r25, 0x5c(r1)`
391			`l.lwz r26, 0x60(r1)`
392			`l.lwz r27, 0x64(r1)`
393			`l.lwz r28, 0x68(r1)`
394			`l.lwz r29, 0x6c(r1)`
395			`l.lwz r30, 0x70(r1)`
396			`l.lwz r31, 0x74(r1)`
397			`l.lwz r32, 0x78(r1)`
398
399	470	julius	`l.addi r1, r1, EXCEPTION_STACK_SIZE`
400	349	julius
401			`l.rfe`
402			`l.nop`
403

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