jens
21fa0293d6
- added call to libsys_init() which calls dbg_init(). libsys_init() is in libsys.c 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@636 cc03376c-175c-47c8-b038-4cd826a8556b
88 lines
1.2 KiB
ArmAsm
88 lines
1.2 KiB
ArmAsm
.file "startup.S"
|
|
|
|
.section .rodata
|
|
.data
|
|
argv0: .asciz "\"This-MIPS-program\""
|
|
argv: .word argv0
|
|
|
|
.text
|
|
.section .start, "ax"
|
|
.extern _init
|
|
.extern libsys_init
|
|
.extern _exc_vect_start
|
|
.extern _xcpt_handler
|
|
.align 2
|
|
.globl _start
|
|
_start:
|
|
.set noreorder
|
|
j init
|
|
nop
|
|
.set reorder
|
|
|
|
.text
|
|
.set noreorder
|
|
init:
|
|
# Set stack pointer
|
|
la $sp, stack_ptr
|
|
# Set global pointer
|
|
la $gp, _gp
|
|
|
|
# zero bss
|
|
la $8, __bss_start
|
|
la $9, _end
|
|
$zeroise:
|
|
sw $0, 0($8)
|
|
bne $8, $9, $zeroise
|
|
addiu $8, 4
|
|
|
|
# Install exception vector jump code
|
|
la $t1, _exc_vect_copy_start
|
|
la $t2, _exc_vect_copy_end
|
|
la $t0, _exc_vect_start
|
|
|
|
$install: lw $v0, 0($t1)
|
|
addiu $t1, 4
|
|
sw $v0, 0($t0)
|
|
bne $t1, $t2, $install
|
|
addiu $t0, 4
|
|
|
|
# Call _init
|
|
la $k0, _init
|
|
jalr $k0
|
|
nop
|
|
|
|
# Call libsys_init
|
|
la $k0, libsys_init
|
|
jalr $k0
|
|
nop
|
|
|
|
# Set user-mode
|
|
mfc0 $a0, $12
|
|
li $a1, 3
|
|
or $a0, $a1
|
|
mtc0 $a0, $12
|
|
|
|
# Set environment
|
|
li $a0, 1
|
|
la $a1, argv
|
|
|
|
# Call main
|
|
la $k0, main
|
|
jalr $k0
|
|
nop
|
|
|
|
# Terminate after main returns
|
|
_terminate:
|
|
nop
|
|
la $t0, exit
|
|
jalr $t0
|
|
move $a0, $v0
|
|
|
|
_exc_vect_copy_start:
|
|
la $k0, _xcpt_handler
|
|
jr $k0
|
|
nop
|
|
_exc_vect_copy_end:
|
|
|
|
.set reorder
|