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Simple PRX Problem

 
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ADePSP



Joined: 13 Jul 2006
Posts: 58
PostPosted: Thu Sep 21, 2006 11:36 pm    Post subject: Simple PRX Problem Reply with quote
I've been trying to make a simple prx that just writes to a file when you press X but when I load it with DevHook it crashes the PSP when the Playstation animation comes up...

I copied my test.prx file to the root of the memstick ms0:/test.prx and then added that line to the following DevHook files (after the /kd/isofs.prx line),

ms0://dh/260/flash0/kd/pspbtcnf.txt
ms0://dh/260/flash0/kd/pspbtcnf_game.txt

My prx did nothing before I added this to the top of the source and after I did that it started crashing...

PSP_MODULE_INFO("PRX Test", 0x1000, 1, 0);
PSP_MAIN_THREAD_ATTR(0);

Can anyone see what i'm doing wrong here... Here's the main.c file,

Code:
#include <pspctrl.h>
#include <pspkernel.h>
#include <stdio.h>

PSP_MODULE_INFO("PRX Test", 0x1000, 1, 0);
PSP_MAIN_THREAD_ATTR(0);

int MainThread (SceSize args, void *argp) {

  SceCtrlData pad;
  int i;
  FILE* fp;

  while (1) {

     sceCtrlPeekBufferPositive(&pad, 1);

     if (pad.Buttons & PSP_CTRL_CROSS) {

        fp = fopen("ms0:/test.txt","w+");
        if (fp) {
           fprintf(fp,"Pressed X");
        }
        fclose(fp);

     }

     for (i=0; i<5; i++) {
        sceDisplayWaitVblankStart();
     }

  }

  return 0;

}

int module_start(SceSize args, void *argp) {

  SceUID thid;

  thid = sceKernelCreateThread("PRX_Test", MainThread, 0x18, 0x1000, 0, NULL);
  if (thid >= 0) sceKernelStartThread(thid, args, argp);

  return 0;

}

int module_stop(void) {

  return 0;

}


Here's the makefile,

Code:
TARGET = test
OBJS = main.o

BUILD_PRX=1

USE_PSPSDK_LIBC=1
USE_PSPSDK_LIBS=1
#USE_KERNEL_LIBC=1
#USE_KERNEL_LIBS=1

PRX_EXPORTS=exports.exp

INCDIR =
CFLAGS = -Os -G0 -Wall -fno-strict-aliasing -fno-builtin-printf
CXXFLAGS = $(CFLAGS) -fno-exceptions -fno-rtti
ASFLAGS = $(CFLAGS)

LIBDIR =
LDFLAGS = -mno-crt0 -nostartfiles
LIBS =

PSPSDK=$(shell psp-config --pspsdk-path)
include $(PSPSDK)/lib/build.mak


and here's the exports.exp,

Code:
# Define the exports for the prx

PSP_BEGIN_EXPORTS

# These four lines are mandatory (although you can add other functions like module_stop)
# syslib is a psynonym for the single mandatory export.

PSP_EXPORT_START(syslib, 0, 0x8000)

PSP_EXPORT_FUNC(module_start)
PSP_EXPORT_VAR(module_info)
PSP_EXPORT_FUNC(module_stop)

PSP_EXPORT_END

PSP_END_EXPORTS
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adrahil



Joined: 16 Mar 2006
Posts: 277
PostPosted: Fri Sep 22, 2006 3:54 am    Post subject: Reply with quote
Use sceIO* commands for file manipulation...

Here's a stripped down example of devhook prx:
Makefile:
Code:
TARGET = controls
OBJS = crt0_prx.o

# Define to build this as a prx (instead of a static elf)
BUILD_PRX=1
# Define the name of our custom exports (minus the .exp extension)
PRX_EXPORTS=exports.exp

USE_KERNEL_LIBS = 1
USE_KERNEL_LIBC = 1

INCDIR =
CFLAGS = -O2 -G0 -Wall
CXXFLAGS = $(CFLAGS) -fno-exceptions -fno-rtti
ASFLAGS = $(CFLAGS)

LIBDIR =
#LIBS =
LDFLAGS =  -nostdlib -nodefaultlibs


PSPSDK=$(shell psp-config --pspsdk-path)
include $(PSPSDK)/lib/build.mak


crt0_prx.c:
Code:
/*
   based by

 * PSP Software Development Kit - http://www.pspdev.org
 * -----------------------------------------------------------------------
 * Licensed under the BSD license, see LICENSE in PSPSDK root for details.
 *
 * crt0_prx.c - Pure PRX startup code.
 *
 * Copyright (c) 2005 Marcus R. Brown <mrbrown@ocgnet.org>
 *
 * $Id: crt0.c 1526 2005-12-06 21:56:06Z tyranid $

*/

#include <pspkerneltypes.h>
#include <pspmoduleinfo.h>
#include <pspiofilemgr.h>
#include <pspthreadman.h>
#include <stdlib.h>
#include <string.h>

PSP_MODULE_INFO("TESTPLUGIN", 0x3007, 1, 2);
PSP_MAIN_THREAD_ATTR(0); // 0 for kernel mode too

int module_start(SceSize args, void *argp) __attribute__((alias("_start")));


int _start(SceSize args, void *argp)
{
 int x,ret;

char *done="\nLOADED module!!!\n";
int afd;
afd = sceIoOpen("ms0:/test.txt", PSP_O_WRONLY|PSP_O_CREAT|PSP_O_APPEND, 0777);
sceIoWrite(afd, done, strlen(done)*sizeof(char));
sceIoClose(afd);

//
// ADD YOUR THREAD STARTING HERE
//
   return 0;
}

exports.exp:
Code:
# Define the exports for the prx
PSP_BEGIN_EXPORTS

PSP_EXPORT_START(syslib, 0, 0x8000)
PSP_EXPORT_FUNC_HASH(module_start)
PSP_EXPORT_VAR_HASH(module_info)
PSP_EXPORT_END

PSP_END_EXPORTS
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