jens
21f33a1768
S/W can write exception handler entry to this table. Exception handler can now reside anywhere in memory. Committed on the Free edition of March Hare Software CVSNT Server. Upgrade to CVS Suite for more features and support: http://march-hare.com/cvsnt/ git-svn-id: http://moon:8086/svn/vhdl/trunk@494 cc03376c-175c-47c8-b038-4cd826a8556b
88 lines
1.2 KiB
ArmAsm
88 lines
1.2 KiB
ArmAsm
.file "startup.S"
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.section .rodata
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.data
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argv0: .asciz "\"This-MIPS-program\""
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argv: .word argv0
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.text
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.section .start, "ax"
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.extern _init
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.extern dbg_init
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.extern _exc_vect_start
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.extern _xcpt_handler
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.align 2
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.globl _start
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_start:
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.set noreorder
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j init
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nop
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.set reorder
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.text
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.set noreorder
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init:
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# Set stack pointer
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la $sp, stack_ptr
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# Set global pointer
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la $gp, _gp
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# zero bss
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la $8, __bss_start
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la $9, _end
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$zeroise:
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sw $0, 0($8)
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bne $8, $9, $zeroise
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addiu $8, 4
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# Install exception vector jump code
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la $t1, _exc_vect_copy_start
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la $t2, _exc_vect_copy_end
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la $t0, _exc_vect_start
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$install: lw $v0, 0($t1)
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addiu $t1, 4
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sw $v0, 0($t0)
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bne $t1, $t2, $install
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addiu $t0, 4
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# Call _init
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la $k0, _init
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jalr $k0
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nop
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# Call dbg_init
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la $k0, dbg_init
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jalr $k0
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nop
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# Set environment
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li $a0, 1
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la $a1, argv
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# Set user-mode
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mfc0 $a0, $12
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li $a1, 3
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or $a0, $a1
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mtc0 $a0, $12
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# Call main
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la $k0, main
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jalr $k0
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nop
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# Terminate after main returns
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_terminate:
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nop
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la $t0, exit
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jalr $t0
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move $a0, $v0
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_exc_vect_copy_start:
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la $k0, _xcpt_handler
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jr $k0
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nop
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_exc_vect_copy_end:
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.set reorder
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