diff options
Diffstat (limited to 'ldso/ldso/i386/ld_sysdep.h')
-rw-r--r-- | ldso/ldso/i386/ld_sysdep.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/ldso/ldso/i386/ld_sysdep.h b/ldso/ldso/i386/ld_sysdep.h new file mode 100644 index 000000000..9bbeef1fa --- /dev/null +++ b/ldso/ldso/i386/ld_sysdep.h @@ -0,0 +1,82 @@ + +/* + * 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) |