uclibc-ng/ldso/ldso/i386/dl-sysdep.h

/*
 * Various assmbly language/system dependent  hacks that are required
 * so that we can minimize the amount of platform specific code.
 */

/*
 * Define this if the system uses RELOCA.
 */
#undef ELF_USES_RELOCA

/*
 * Get a pointer to the argv array.  On many platforms this can be just
 * the address if the first argument, on other platforms we need to
 * do something a little more subtle here.
 */
#define GET_ARGV(ARGVP, ARGS) ARGVP = ((unsigned int*) & ARGS)
/*
 * Get the address of the Global offset table.  This must be absolute, not
 * relative.
 */
#define GET_GOT(X)     __asm__("\tmovl %%ebx,%0\n\t" : "=a" (X))

/*
 * Initialization sequence for a GOT.
 */
#define INIT_GOT(GOT_BASE,MODULE) \
{				\
  GOT_BASE[2] = (int) _dl_linux_resolve; \
  GOT_BASE[1] = (int) MODULE; \
}

/*
 * Here is a macro to perform a relocation.  This is only used when
 * bootstrapping the dynamic loader.  RELP is the relocation that we
 * are performing, REL is the pointer to the address we are relocating.
 * SYMBOL is the symbol involved in the relocation, and LOAD is the
 * load address.
 */
#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD) \
	switch(ELF32_R_TYPE((RELP)->r_info)){		\
	case R_386_32:		\
	  *REL += SYMBOL;		\
	  break;		\
	case R_386_PC32:		\
	  *REL += SYMBOL - (unsigned int) REL;		\
	  break;		\
	case R_386_GLOB_DAT:		\
	case R_386_JMP_SLOT:		\
	  *REL = SYMBOL;		\
	  break;		\
	case R_386_RELATIVE:		\
	  *REL += (unsigned int) LOAD;		\
	  break;		\
	default:		\
	  _dl_exit(1);		\
	}


/*
 * Transfer control to the user's application, once the dynamic loader
 * is done.
 */

#define START()		\
	__asm__ volatile ("leave\n\t" \
		    "jmp *%%eax\n\t"	\
		    : "=a" (status) :	\
		    "d" (_dl_interpreter_exit), "a" (_dl_elf_main))



/* Here we define the magic numbers that this dynamic loader should accept */

#define MAGIC1 EM_386
#define MAGIC2 EM_486
/* Used for error messages */
#define ELF_TARGET "386/486"

extern unsigned int _dl_linux_resolver(int dummy, int i);

#define do_rem(result, n, base)  result = (n % base)