First off to get the sceKernelExitGame function working you need to setup your main function in a thread, if you are using nem's source for hellopsp you will need to change the _start: function in startup.s. Here is an example.
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.ent _start
.weak _start
_start:
addiu $sp, 0x10
sw $ra, 0($sp)
sw $s0, 4($sp)
sw $s1, 8($sp)
move $s0, $a0 # Save args
move $s1, $a1
la $a0, _main_thread_name # Main thread setup
la $a1, xmain
li $a2, 0x20 # Priority
li $a3, 0x40000 # Stack size
lui $t0, 0x8000 # Attributes
jal sceKernelCreateThread
move $t1, $0
move $a0, $v0 # Start thread
move $a1, $s0
jal sceKernelStartThread
move $a2, $s1
lw $ra, 0($sp)
lw $s0, 4($sp)
lw $s1, 8($sp)
move $v0, $0
jr $ra
addiu $sp, 0x10
_main_thread_name:
.asciiz "user_main"
The home button will generate a callback whenever it is pressed, but only if one is registered. If one is not registered it will do nothing at all so to do this we call sceKernelCreateCallback to make a new callback and then pass it to SetExitCallback. So...
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int exit_callback(void)
{
// Cleanup the games resources etc (if required)
// Exit game
sceKernelExitGame();
return 0;
}
#define POWER_CB_POWER 0x80000000
#define POWER_CB_HOLDON 0x40000000
#define POWER_CB_STANDBY 0x00080000
#define POWER_CB_RESCOMP 0x00040000
#define POWER_CB_RESUME 0x00020000
#define POWER_CB_SUSPEND 0x00010000
#define POWER_CB_EXT 0x00001000
#define POWER_CB_BATLOW 0x00000100
#define POWER_CB_BATTERY 0x00000080
#define POWER_CB_BATTPOWER 0x0000007F
void power_callback(int unknown, int pwrflags)
{
// Combine pwrflags and the above defined masks
}
// Thread to create the callbacks and then begin polling
int CallbackThread(void *arg)
{
int cbid;
cbid = sceKernelCreateCallback("Exit Callback", exit_callback);
sceKernelRegisterExitCallback(cbid);
cbid = sceKernelCreateCallback("Power Callback", power_callback);
scePowerRegisterCallback(0, cbid);
KernelPollCallbacks();
}
/* Sets up the callback thread and returns its thread id */
int SetupCallbacks(void)
{
int thid = 0;
thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
if(thid >= 0)
{
sceKernelStartThread(thid, 0, 0);
}
return thid;
}
Before you ask the functions used in here are all listed in http://forums.ps2dev.org/viewtopic.php?t=1594
