1 files changed, 69 insertions, 0 deletions
diff --git a/ldso/ldso/x86_64/dl-startup.h b/ldso/ldso/x86_64/dl-startup.h
new file mode 100644
index 000000000..1b83e5d91
--- /dev/null
+++ b/ldso/ldso/x86_64/dl-startup.h
@@ -0,0 +1,69 @@
+/* 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