Playstation EXE header

Published in

· 3 Jun 2020

I know of 3 types (SCE, PS-X, CPE), but 2 of them are almost the same, and share most of the fields. The CPE structure will be left for another time as i miss some info that is needed to start parsing objects.

  
typedef struct _EXE_HEADER_ { 
u_byte id[8]; 
u_long text;     /* SCE only */ 
u_long data;     /* SCE only */ 
u_long pc0; 
u_long gp0;      /* SCE only */ 
u_long t_addr; 
u_long t_size; 
u_long d_addr;   /* SCE only */ 
u_long d_size;   /* SCE only */ 
u_long b_addr;   /* SCE only */ 
u_long b_size;   /* SCE only */ 
u_long s_addr; 
u_long s_size; 
u_long SavedSP; 
u_long SavedFP; 
u_long SavedGP; 
u_long SavedRA; 
u_long SavedS0; 
} EXE_HEADER;

Explanation

  
ExeType = { 'SCE EXE' || 'PS-X EXE' };  
text - Offset of the text segment  
data - Offset of the data segment  
pc0 - Program Counter.  
gp0 - Address of the Global Pointer  
t_addr - The address where the text segment is loaded  
t_size - The size of the text segment  
d_addr - The address where the text segment is loaded  
d_size - The size of the data segment  
b_addr - The address of the BSS segment  
b_size - The size of the BSS segment  
s_addr - The address of the stack  
s_size - The size of the stack.  
SavedXX -The Exec system call saves some registers to these fields before jumping to the program