From 1c8d4e69205fd875f6bec3fa3bd929c2e7f52f62 Mon Sep 17 00:00:00 2001 From: Nicholas Noll Date: Sat, 20 Nov 2021 09:53:11 -0800 Subject: Feature: self hosting prototype implemented This is a large change. In order to remove myself from libc's arcane interface, I implemented an independent runtime layer. It is based on musl's wonderful implementation mostly. Critically, if libc is linked to the program, then we cooperate. Namely, we call start main and let libc do all initialization. If not, then we have a noop defined in rt3.a. The general structure of the file is: 1. sys/$os/$arch contains all architecture dependent code 2. sys/$os/port contains all code that depends on the os, but is portable 3. rt/$arch contains all the runtime architecture dependent code 4. rt/* contains the portable runtime code. Obviously testing is needed. Specifically, while code is checked in for the most popular architectures, it only has been tested on one computer! Overall this is exciting and as been educational. --- sys/rt/amd64/crt1.s | 21 --------------------- 1 file changed, 21 deletions(-) delete mode 100644 sys/rt/amd64/crt1.s (limited to 'sys/rt/amd64/crt1.s') diff --git a/sys/rt/amd64/crt1.s b/sys/rt/amd64/crt1.s deleted file mode 100644 index aaad0ba..0000000 --- a/sys/rt/amd64/crt1.s +++ /dev/null @@ -1,21 +0,0 @@ -global _start - -; NOTE: assumes program loader has put argc, argv, envc, envp on stack -section .text -_start: - xor rbp,rbp ; base pointer undefined: set to 0 - mov r9,rdx ; 6th arg: function to register with atexit() - pop rsi ; 2nd arg: argc - mov rdx,rsp ; 3rd arg: argv - and rsp,$-16 ; align stack pointer to 16 bytes - mov $_fini,r8 ; 5th arg: fini - mov $_init,rcx ; 4th arg: init - mov $main,rdi ; 1st arg: main - - call rt·boot ; int boot( - ; int(*main)(int,char*[],char*[]), - ; int argc, - ; char *argv[], - ; init, fini, atexit); - -.loop: jmp .loop ; should never reach... -- cgit v1.2.1