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- /* vi: set sw=4 ts=4: */
- /*
- * Architecture specific code used by dl-startup.c
- * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org>
- */
- asm(
- " .text\n"
- " .align 16\n"
- " .global _start\n"
- " .type _start,%function\n"
- "_start:\n"
- " movq %rsp, %rdi\n"
- " call _dl_start\n"
- " # Save the user entry point address in %r12.\n"
- " movq %rax, %r12\n"
- " # See if we were run as a command with the executable file\n"
- " # name as an extra leading argument.\n"
- " movl _dl_skip_args(%rip), %eax\n"
- " # Pop the original argument count.\n"
- " popq %rdx\n"
- " # Adjust the stack pointer to skip _dl_skip_args words.\n"
- " leaq (%rsp,%rax,8), %rsp\n"
- " # Subtract _dl_skip_args from argc.\n"
- " subl %eax, %edx\n"
- " # Push argc back on the stack.\n"
- " pushq %rdx\n"
- " # Pass our finalizer function to the user in %rdx, as per ELF ABI.\n"
- " leaq _dl_fini(%rip), %rdx\n"
- " # And make sure %rsp points to argc stored on the stack.\n"
- " movq %r13, %rsp\n"
- " # Jump to the user's entry point.\n"
- " jmp *%r12\n"
- " .size _start,.-_start\n"
- " .previous\n"
- );
- /* 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 long*) & ARGS)+1)
- /* Handle relocation of the symbols in the dynamic loader. */
- static __always_inline
- void PERFORM_BOOTSTRAP_RELOC(ELF_RELOC *rpnt, unsigned long *reloc_addr,
- unsigned long symbol_addr, unsigned long load_addr, Elf64_Sym *sym)
- {
- switch (ELF64_R_TYPE(rpnt->r_info)) {
- case R_X86_64_GLOB_DAT:
- case R_X86_64_JUMP_SLOT:
- *reloc_addr = symbol_addr + rpnt->r_addend;
- break;
- case R_X86_64_DTPMOD64:
- *reloc_addr = 1;
- break;
- case R_X86_64_NONE:
- case R_X86_64_DTPOFF64:
- break;
- case R_X86_64_TPOFF64:
- *reloc_addr = sym->st_value + rpnt->r_addend - symbol_addr;
- break;
- default:
- _dl_exit(1);
- }
- }
- /* Transfer control to the user's application, once the dynamic loader is
- * done. This routine has to exit the current function, then call the
- * _dl_elf_main function. */
- #define START() return _dl_elf_main
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