libosd.c

Go to the documentation of this file.

/*
# _____     ___ ____     ___ ____
#  ____|   |    ____|   |        | |____|
# |     ___|   |____ ___|    ____| |    \    PS2DEV Open Source Project.
#-----------------------------------------------------------------------
# Licenced under Academic Free License version 2.0
# Review ps2sdk README & LICENSE files for further details.
*/
 
#include <kernel.h>
#include <syscallnr.h>
#include <osd_config.h>
 
extern unsigned char osdsrc[];
extern unsigned int size_osdsrc;
 
struct SyscallData{
        int syscall_num;
        void *function;
};
 
static struct SyscallData SyscallPatchEntries[]={
        {
                0x5A,
                &kCopy
        },
        {
                0x5B,
                (void*)0x80074000
        },
        {
                // This uses the Setup (aka "SetSyscall") syscall to patch the kernel. The address is relative to the start of the syscall table, and is in units of 32-bit pointers (4 bytes).
                0xFFFFC402,     // 0x80011F80+(-15358*4)=0x80002F88, where 0x80011F80 is the start of the syscall table.
                NULL
        },
};
 
void InitExecPS2(void){
        unsigned int i;
 
        if(PatchIsNeeded()){
                setup(SyscallPatchEntries[0].syscall_num, SyscallPatchEntries[0].function);
                Copy((unsigned int*)0x80074000, (unsigned int*)osdsrc, size_osdsrc);
 
                FlushCache(0);
                FlushCache(2);
                setup(SyscallPatchEntries[1].syscall_num, SyscallPatchEntries[1].function);
 
                for(i=2; i<3; i++){
                        setup(SyscallPatchEntries[i].syscall_num, GetEntryAddress(SyscallPatchEntries[i].syscall_num));
                }
        }
}