| Line 58... |
Line 58... |
l.mfspr r5,r0,SPR_EPCR_BASE /* Source of the interrupt */ ;\
|
l.mfspr r5,r0,SPR_EPCR_BASE /* Source of the interrupt */ ;\
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l.jal printf ;\
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l.jal printf ;\
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l.sw 8(r1),r5 ;\
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l.sw 8(r1),r5 ;\
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;\
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;\
|
l.ori r3,r0,0xffff /* Failure RC */ ;\
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l.ori r3,r0,0xffff /* Failure RC */ ;\
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l.jal _exit ;\
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l.jal exit ;\
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l.nop ;\
|
l.nop ;\
|
;\
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;\
|
l.rfe /* Never executed we hope */
|
l.rfe /* Never executed we hope */
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|
|
|
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| Line 108... |
Line 108... |
/* -------------------------------------------------------------------------- */
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/* -------------------------------------------------------------------------- */
|
.section .vectors,"ax"
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.section .vectors,"ax"
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|
|
/* 0x100: RESET exception */
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/* 0x100: RESET exception */
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.org 0x100
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.org 0x100
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_reset:
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__reset:
|
/* Jump to program initialisation code */
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/* Jump to program initialisation code */
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l.j _start
|
l.j _start
|
l.nop
|
l.nop
|
|
|
/* 0x200: BUS exception is special, because during startup we use it
|
/* 0x200: BUS exception is special, because during startup we use it
|
| Line 122... |
Line 122... |
this code must be copied into the bus error vector each time. It is
|
this code must be copied into the bus error vector each time. It is
|
position independent to allow this copying.
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position independent to allow this copying.
|
|
|
We use registers we know will not interfere in this case. */
|
We use registers we know will not interfere in this case. */
|
.org 0x200
|
.org 0x200
|
_buserr:
|
__buserr:
|
l.nop /* Will be overwritten */
|
l.nop /* Will be overwritten */
|
l.nop
|
l.nop
|
l.nop
|
l.nop
|
l.nop
|
l.nop
|
|
|
_buserr_std:
|
__buserr_std:
|
UNHANDLED_EXCEPTION (.L200)
|
UNHANDLED_EXCEPTION (.L200)
|
|
|
_buserr_special:
|
__buserr_special:
|
l.mfspr r24,r0,SPR_EPCR_BASE
|
l.mfspr r24,r0,SPR_EPCR_BASE
|
l.addi r24,r24,4 /* Return one instruction on */
|
l.addi r24,r24,4 /* Return one instruction on */
|
l.mtspr r0,r24,SPR_EPCR_BASE
|
l.mtspr r0,r24,SPR_EPCR_BASE
|
l.rfe
|
l.rfe
|
|
|
| Line 270... |
Line 270... |
.type _start,@function
|
.type _start,@function
|
|
|
_start:
|
_start:
|
/* Finding the end of stack means we need to handle the bus
|
/* Finding the end of stack means we need to handle the bus
|
error. Patch in some special handler code. */
|
error. Patch in some special handler code. */
|
l.movhi r30,hi(_buserr) /* Where to copy to */
|
l.movhi r30,hi(__buserr) /* Where to copy to */
|
l.ori r30,r30,lo(_buserr)
|
l.ori r30,r30,lo(__buserr)
|
l.movhi r28,hi(_buserr_std) /* Where to stop copying */
|
l.movhi r28,hi(__buserr_std) /* Where to stop copying */
|
l.ori r28,r28,lo(_buserr_std)
|
l.ori r28,r28,lo(__buserr_std)
|
l.movhi r26,hi(_buserr_special) /* Where to copy from */
|
l.movhi r26,hi(__buserr_special)/* Where to copy from */
|
l.ori r26,r26,lo(_buserr_special)
|
l.ori r26,r26,lo(__buserr_special)
|
|
|
.L11: l.sfeq r28,r30
|
.L11: l.sfeq r28,r30
|
l.bf .L12
|
l.bf .L12
|
l.nop
|
l.nop
|
|
|
| Line 323... |
Line 323... |
/* Initialise stack and frame pointer (set to same value) */
|
/* Initialise stack and frame pointer (set to same value) */
|
l.add r1,r30,r0
|
l.add r1,r30,r0
|
l.add r2,r30,r0
|
l.add r2,r30,r0
|
|
|
/* Clear out the bus error vector special code. */
|
/* Clear out the bus error vector special code. */
|
l.movhi r30,hi(_buserr)
|
l.movhi r30,hi(__buserr)
|
l.ori r30,r30,lo(_buserr)
|
l.ori r30,r30,lo(__buserr)
|
l.movhi r28,hi(_buserr_std)
|
l.movhi r28,hi(__buserr_std)
|
l.ori r28,r28,lo(_buserr_std)
|
l.ori r28,r28,lo(__buserr_std)
|
l.movhi r26,0x1500 /* l.nop 0 */
|
l.movhi r26,0x1500 /* l.nop 0 */
|
l.ori r26,r26,0x0000
|
l.ori r26,r26,0x0000
|
|
|
.L5: l.sfeq r28,r30
|
.L5: l.sfeq r28,r30
|
l.bf .L6
|
l.bf .L6
|
| Line 451... |
Line 451... |
l.sfltu r28,r30
|
l.sfltu r28,r30
|
l.bf .L1
|
l.bf .L1
|
l.addi r28,r28,4 /* Delay slot */
|
l.addi r28,r28,4 /* Delay slot */
|
|
|
/* Call global and static constructors */
|
/* Call global and static constructors */
|
l.jal init
|
l.jal __init
|
l.nop
|
l.nop
|
|
|
/* Set up destructors to be called from exit if main never returns */
|
/* Set up destructors to be called from exit if main never returns */
|
l.movhi r3,hi(fini)
|
l.movhi r3,hi(__fini)
|
l.jal atexit
|
l.jal atexit
|
l.ori r3,r3,lo(fini) /* Delay slot */
|
l.ori r3,r3,lo(__fini) /* Delay slot */
|
|
|
/* Initialise UART in a C function. If the UART isn't present, we'll */
|
/* Initialise UART in a C function. If the UART isn't present, we'll */
|
/* link against a dummy function. */
|
/* link against a dummy function. */
|
l.jal _uart_init
|
l.jal __uart_init
|
l.nop
|
l.nop
|
|
|
/* Jump to main program entry point (argc = argv = envp = 0) */
|
/* Jump to main program entry point (argc = argv = envp = 0) */
|
l.or r3,r0,r0
|
l.or r3,r0,r0
|
l.or r4,r0,r0
|
l.or r4,r0,r0
|
l.jal main
|
l.jal main
|
l.or r5,r0,r0 /* Delay slot */
|
l.or r5,r0,r0 /* Delay slot */
|
|
|
/* If program exits, call exit routine */
|
/* If program exits, call exit routine */
|
l.jal _exit
|
l.jal exit
|
l.addi r3,r11,0 /* Delay slot */
|
l.addi r3,r11,0 /* Delay slot */
|
|
|
/* Loop forever */
|
/* Loop forever */
|
.L2: l.j .L2
|
.L2: l.j .L2
|
l.nop
|
l.nop
|
