Luna/libc/src/arch/x86_64/crt0.S

.section .text

.global _start
.extern exit
.extern libc_init
.extern _init
.extern _fini
_start:
	# Set up end of the stack frame linked list.
	movq $0, %rbp
	pushq %rbp # rip=0
	pushq %rbp # rbp=0
	movq %rsp, %rbp

	pushq %rsi
	pushq %rdi
	pushq %rcx

	call libc_init

	# Run the global constructors.
	call _init

	popq %rdx
	popq %rdi
	popq %rsi

	# Run main
	call main

	# Store the exit code before calling _fini.
	push %rax

	call _fini

	# Terminate the process with the exit code.
	pop %rdi
	call exit
Switch to C for userspace, with a very bare-bones libc!! 2023-01-06 12:31:14 +00:00			`.section .text`

			`.global _start`
			`.extern exit`
libc: Start switching to /dev/console for console IO and add a proper init 2023-03-18 18:23:18 +00:00			`.extern libc_init`
libc+tests+tools: Call global constructors in userspace code 2024-01-04 20:02:51 +00:00			`.extern _init`
			`.extern _fini`
Switch to C for userspace, with a very bare-bones libc!! 2023-01-06 12:31:14 +00:00			`_start:`
			`# Set up end of the stack frame linked list.`
			`movq $0, %rbp`
			`pushq %rbp # rip=0`
			`pushq %rbp # rbp=0`
			`movq %rsp, %rbp`

kernel+libc: Copy argv to userspace 2023-03-18 21:25:19 +00:00			`pushq %rsi`
			`pushq %rdi`
kernel+libc+apps: Add support for environment variables 2023-04-07 13:03:38 +00:00			`pushq %rcx`
kernel+libc: Copy argv to userspace 2023-03-18 21:25:19 +00:00
libc: Start switching to /dev/console for console IO and add a proper init 2023-03-18 18:23:18 +00:00			`call libc_init`

Switch to C for userspace, with a very bare-bones libc!! 2023-01-06 12:31:14 +00:00			`# Run the global constructors.`
			`call _init`

kernel+libc+apps: Add support for environment variables 2023-04-07 13:03:38 +00:00			`popq %rdx`
kernel+libc: Copy argv to userspace 2023-03-18 21:25:19 +00:00			`popq %rdi`
			`popq %rsi`

Switch to C for userspace, with a very bare-bones libc!! 2023-01-06 12:31:14 +00:00			`# Run main`
			`call main`

libc+tests+tools: Call global constructors in userspace code 2024-01-04 20:02:51 +00:00			`# Store the exit code before calling _fini.`
			`push %rax`

			`call _fini`

Switch to C for userspace, with a very bare-bones libc!! 2023-01-06 12:31:14 +00:00			`# Terminate the process with the exit code.`
libc+tests+tools: Call global constructors in userspace code 2024-01-04 20:02:51 +00:00			`pop %rdi`
Switch to C for userspace, with a very bare-bones libc!! 2023-01-06 12:31:14 +00:00			`call exit`