diff options
Diffstat (limited to 'lib/csu/amd64/crt1_s.S')
| -rw-r--r-- | lib/csu/amd64/crt1_s.S | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/lib/csu/amd64/crt1_s.S b/lib/csu/amd64/crt1_s.S new file mode 100644 index 000000000000..3ceea9289330 --- /dev/null +++ b/lib/csu/amd64/crt1_s.S @@ -0,0 +1,86 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (C) 2023 Dmitry Chagin <dchagin@FreeBSD.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <machine/asm.h> + + + .text + .align 8 + + /* + * The program entry point + * %rdi %rsi + * void _start(char **ap, void (*cleanup)(void)) __dead2 + */ + .globl _start + .type _start, @function +_start: + .cfi_startproc + .cfi_undefined %rip /* Terminate call chain. */ + pushq %rbp /* Align stack, terminate call chain. */ + .cfi_def_cfa_offset 8 + movq %rsp, %rbp + .cfi_offset %rbp, -16 + .cfi_def_cfa_register %rbp +#ifdef GCRT + subq $16, %rsp +#endif + movq %rsi, %rcx /* cleanup */ + movslq (%rdi), %rax /* long *ap; tmpargc = *ap */ + leaq 0x8(%rdi), %rsi /* argv = ap + 1 */ + leaq 0x10(%rdi, %rax, 8), %rdx /* env = ap + 2 + tmpargc */ + movl %eax, %edi /* argc = tmpargc */ + +#ifdef PIC + /* + * XXX. %rip relative addressing is not intended for use in the + * large memory model due to the offset from %rip being limited + * to 32 bits. + */ + leaq main@plt(%rip), %r8 +#else + movabsq $main, %r8 +#endif +#ifdef GCRT + movabsq $eprol, %r9 + movabsq $etext, %rax + movq %rax, (%rsp) + /* + * %edi %rsi %rdx %rcx %r8 %r9 (%rsp) + * __libc_start1_gcrt(argc, argv, env, cleanup, main, &eprol, &etext) + */ + callq __libc_start1_gcrt +eprol: +#else + /* __libc_start1(argc, argv, env, cleanup, main) */ + callq __libc_start1 +#endif + int3 + .cfi_endproc + .size _start, . - _start + + .section .note.GNU-stack,"",%progbits |