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Heimdall
Joined: 10 Nov 2005
Posts: 259
Location: Netherlands
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 Posted: Fri Oct 10, 2008 10:07 pm Post subject: minumum hello world asm code for psp-as? |
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Hi guys, any of you can help me how and post a simple piece of asm code that i can build directly using psp-as?
I mean i'm not interested in gcc asm, i want the real deal :) I want to research some code generation stuff, but i'm kind of stuck on how to bootstrap my application.
Thanks! |
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[wl]
Joined: 05 May 2006
Posts: 16
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| Posted: Fri Oct 10, 2008 10:41 pm Post subject: |
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| you may get .s file, if u add "-save-temps"(without quotes) flag to CFLAGS in your makefile, to see the "right" structure of program, which can be compiled |
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Noko
Joined: 06 Sep 2008
Posts: 23
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| Posted: Fri Oct 10, 2008 10:42 pm Post subject: |
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| Code: | Andrey:/cygdrive/b/src/noscript$ cat>hello.c
#include "stdio.h"
int main(int argc,char **argv){
printf("Hello world!\n");
return 0;
}
[1]+ Stopped cat > hello.c
Andrey:/cygdrive/b/src/noscript$ psp-gcc hello.c -S -o hello.S
Andrey:/cygdrive/b/src/noscript$ cat hello.S
.file 1 "hello.c"
.section .mdebug.eabi32
.section .gcc_compiled_long32
.previous
.rdata
.align 2
$LC0:
.ascii "Hello world!\000"
.text
.align 2
.globl main
.ent main
main:
.frame $fp,16,$31 # vars= 8, regs= 2/0, args= 0, gp= 0
.mask 0xc0000000,-4
.fmask 0x00000000,0
.set noreorder
.set nomacro
addiu $sp,$sp,-16
sw $31,12($sp)
sw $fp,8($sp)
move $fp,$sp
sw $4,0($fp)
sw $5,4($fp)
lui $2,%hi($LC0)
addiu $4,$2,%lo($LC0)
jal puts
nop
move $2,$0
move $sp,$fp
lw $31,12($sp)
lw $fp,8($sp)
addiu $sp,$sp,16
j $31
nop
.set macro
.set reorder
.end main
.size main, .-main
.ident "GCC: (GNU) 4.1.0 (PSPDEV 20060507)"
Andrey:/cygdrive/b/src/noscript$ psp-as hello.S -o hello.o
Andrey:/cygdrive/b/src/noscript$
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Heimdall
Joined: 10 Nov 2005
Posts: 259
Location: Netherlands
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| Posted: Fri Oct 10, 2008 10:56 pm Post subject: |
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Thanks,
Of course, dah!!! i'm really slow today :) i can use GCC to make it!!! |
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J.F.
Joined: 22 Feb 2004
Posts: 2906
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| Posted: Sat Oct 11, 2008 6:15 am Post subject: |
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| Calling the sdk from assembly is easy - just put the arguments into a0-a3, and t0-t3. If you have more than 8 args (not often, but does sometimes happen), put the rest on the stack. Then just do "jal sdk_fn_name". jal has a delay slot, so don't forget that. Also don't forget the ABI... many registers may be destroyed by the called function. Only s0-s8 and a couple other regs won't be walked on. |
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