forums.ps2dev.org

[lezy]

assume my function is running at pc=01e01234 and i would link to jump to 00172345, then i use jal or execps2, but both not work. i am puzzle and do not know how to do!

[Guest]

[mrbrown]

If he's trying to jump to 0x172345 then it's pretty obvious what's wrong :).
_________________
"He was warned..."

[pixel]

Indeed :)
_________________
pixel: A mischievous magical spirit associated with screen displays. The computer industry has frequently borrowed from mythology. Witness the sprites in computer graphics, the demons in artificial intelligence and the trolls in the marketing department.

[Guest]

[lezy]

my code is like this,i use naplink to execute it.when i do not define LOADFROMMEM,the rom0:TESTMODE can be load.buf if i defint LOADFROMMEM,it did not work;
#include <stdio.h>
#include <tamtypes.h>
#include <kernel.h>
#include <sifrpc.h>
#include <compat.h>
#include <malloc.h>
#include <fileio.h>
#include <loadfile.h>
#define LOADFROMMEM
#ifdef LOADFROMMEM
u32 cmdbuf[]={0x3c040016,0x24847cb8,0x0000282d,0x0000302d,0x24030006,0x0000000c};
#endif
void loadtestmode()
{
#ifndef LOADFROMMEM
asm volatile ( " .word 0x3c040016\n"// lui $4,0x16
" .word 0x24847cb8\n"// addiu $4,$4,0x7cb8
" .word 0x0000282d\n"// daddu $5,$0,$0
" .word 0x0000302d\n"// daddu $6,$0,$0
" .word 0x24030006\n"// addiu $3,$0,6
" .word 0x0000000c\n");// syscall
#else
asm volatile("nop\nnop\nnop\nnop\nnop\nnop\n");
#endif

}

int main()
{
u32 *p;
p=(u32 *)loadtestmode;
memcpy((u32*)0x00167cb8,"rom0:TESTMODE\0",16);
#ifdef LOADFROMMEM
memcpy(p,cmdbuf,sizeof(cmdbuf));
#endif
asm volatile ( "sync.p\n"
"sync\n"
"jal %0\n" :: "r" (p));
return 0;
}

[pixel]

Your code is really complex for something which is really simple...


Anyway, the problem here shouldn't belong to the "jal" you're doing, since you say the code works when not defining LOADFROMMEM. For me, the function "loadtestmode" has obviously a prolog. Your memcpy doesn't write at the first byte of your asm, but at some bytes in the prolog. Your solution should be to use the __attribute__((naked)) on your loadtestmode function so that no extra code is added by the compiler. But this still sound strange...


I wouldn't have done it like this at all anyway, and I still wonder what you're trying to achieve :)
_________________
pixel: A mischievous magical spirit associated with screen displays. The computer industry has frequently borrowed from mythology. Witness the sprites in computer graphics, the demons in artificial intelligence and the trolls in the marketing department.

[blackdroid]

[lezy]

thank you everybody.i have found the point.i add flushcache(0),flushcache(2) afer memcpy,then the code run well.
but could come one say something about flushcache,i do not know what it does.

[Guest]

[J.F.]