libosd.c

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/*
# _____     ___ ____     ___ ____
#  ____|   |    ____|   |        | |____|
# |     ___|   |____ ___|    ____| |    \    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},
};
 
__attribute__((weak))
void InitExecPS2(void)
{
    if (PatchIsNeeded()) {
        unsigned int i;
 
        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));
        }
    }
}