Search code examples
cportable-executable

PE File .text Section Size

I wrote code and compiled it to exe, now the .text section need to be larger , If I have the code and I want to allocate more space in the .text section from code before compiling it , how to do so ? Allocate some buffers ?

I'm trying to alter the code or compiling option to result with a binary file with LARGER .TEXT section

my compiler VisualStudio2010 or cl.exe

Patching the binary file is more complicated

Solution

  • Assuming it's really what you want, you may use inline assembly. E.g. for gcc+gas: void unused_global() { __asm(".space 10000"); }

    For Visual Studio's cl.exe, it seems to be more tricky: there is no directives in inline asm, even REPT is unavailable. I would compile a bunch of nops separately with masm; otherwise we have to do something like this:

    #define NOP __asm { NOP } ;
#define NOP8 NOP NOP NOP NOP NOP NOP NOP NOP
#define NOP64 NOP8 NOP8 NOP8 NOP8 NOP8 NOP8 NOP8 NOP8 
#define NOP512 NOP64 NOP64 NOP64 NOP64 NOP64 NOP64 NOP64 NOP64
#define NOP4096 NOP512 NOP512 NOP512 NOP512 NOP512 NOP512 NOP512 NOP512
#define NOP32768 NOP4096 NOP4096 NOP4096 NOP4096 NOP4096 NOP4096 NOP4096 NOP4096
void unused_global() { NOP32768 }