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add argv support

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use v5 code for function calls
This commit is contained in:
Dave Murphy 2007-07-24 08:42:22 +00:00
parent 112d69e563
commit bafdd64032
1 changed files with 79 additions and 9 deletions
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88
dkarm-eabi/crtls/ds_arm9_crt0.s
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@ -1,3 +1,9 @@
@---------------------------------------------------------------------------------
@ DS processor selection
@---------------------------------------------------------------------------------
.arch armv5te
.cpu arm946e-s
@---------------------------------------------------------------------------------
#define PAGE_4K (0b01011 << 1)
#define PAGE_8K (0b01100 << 1)
#define PAGE_16K (0b01101 << 1)
@ -32,6 +38,8 @@
#define DCACHE_ENABLE (1<<2)
#define PROTECT_ENABLE (1<<0)
.equ _libnds_argv,0x027FFF70
@---------------------------------------------------------------------------------
.section ".init"
.global _start
@ -129,7 +137,7 @@ _start:
@-------------------------------------------------------------------------
@ Write buffer enable
@-------------------------------------------------------------------------
ldr r0,=0b00000110
ldr r0,=0b00000010
mcr p15, 0, r0, c3, c0, 0
@-------------------------------------------------------------------------
@ -181,6 +189,8 @@ _start:
ldr r4, =__dtcm_end
bl CopyMemCheck
bl checkARGV @ check and process argv trickery
ldr r0, =__bss_start @ Clear BSS section
ldr r1, =__bss_end
sub r1, r1, r0
@ -190,23 +200,32 @@ _start:
ldr r1, =__sbss_end
sub r1, r1, r0
bl ClearMem
ldr r1, =fake_heap_end @ set heap end
ldr r0, =__eheap_end
str r0, [r1]
ldr r3, =__libc_init_array @ global constructors
bl _call_via_r3
blx r3
ldr r3, =initSystem
bl _call_via_r3 @ jump to user code
blx r3 @ jump to user code
ldr r0, =_libnds_argv
@ reset heap base
ldr r2, [r0,#20] @ newheap base
ldr r1,=fake_heap_start
str r2,[r1]
ldr r1, [r0,#16] @ argv
ldr r0, [r0,#12] @ argc
mov r0, #0 @ int argc
mov r1, #0 @ char *argv[]
ldr r3, =main
bl _call_via_r3 @ jump to user code
blx r3 @ jump to user code
@ If the user ever returns, go to an infinte loop
@ If the user ever returns, go back to passme loop
ldr r0, =ILoop
ldr r0, [r0]
ldr r1, =0x027FFE78
@ -215,6 +234,56 @@ _start:
ILoop:
b ILoop
@---------------------------------------------------------------------------------
@ check for a commandline
@---------------------------------------------------------------------------------
checkARGV:
@---------------------------------------------------------------------------------
ldr r0, =_libnds_argv @ argv structure
mov r1, #0
str r1, [r0,#12] @ clear argc
str r1, [r0,#16] @ clear argv
ldr r1, [r0] @ argv magic number
ldr r2, =0x5f617267 @ '_arg'
cmp r1, r2
bxne lr @ bail out if no magic
ldr r1, [r0, #4] @ command line address
ldr r2, [r0, #8] @ length of command line
@ copy to heap
ldr r3, =__end__ @ initial heap base
str r3, [r0, #4] @ set command line address
cmp r2, #0
subnes r4, r3, r1 @ dst-src
bxeq lr @ dst == src || len==0 : nothing to do.
cmphi r2, r4 @ len > (dst-src)
bhi .copybackward
.copyforward:
ldrb r4, [r1], #1
strb r4, [r3], #1
subs r2, r2, #1
bne .copyforward
b .copydone
.copybackward:
subs r2, r2, #1
ldrb r4, [r1, r2]
strb r4, [r3, r2]
bne .copybackward
.copydone:
push {lr}
ldr r3, =build_argv
blx r3
pop {lr}
bx lr
@---------------------------------------------------------------------------------
@ Clear memory to 0x00 if length != 0
@ r0 = Start Address
@ -263,6 +332,7 @@ CIDLoop:
bne CIDLoop
bx lr
@---------------------------------------------------------------------------------
.align
.pool