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Sourcecode: ld.so version File versions

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 this because we do not want to call .udiv in the library.
 */
#define do_div(n,base) ({ \
int __res; \
__asm__("divl %4":"=a" (n),"=d" (__res):"0" (n),"1" (0),"r" (base)); \
__res; })

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

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