From 1c8d4e69205fd875f6bec3fa3bd929c2e7f52f62 Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
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.
---
 Makefile | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
index 1a48db3..793d888 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ MAKEFLAGS += --no-builtin-variables
 # Compiler, Linker, and Assembler
 CC  := gcc
 AR  := ar
-AS  := nasm
+AS  := gcc
 PKG := PKG_CONFIG_PATH=lib/pkgconfig pkg-config
 
 OS   := linux
@@ -22,26 +22,26 @@ SRC_DIR := src
 OBJ_DIR := obj
 TST_DIR := test
 
-# C runtime library
-CINIT := $(LIB_DIR)/crt/crt1.o $(LIB_DIR)/crt/x86_64/crti.o `gcc --print-file-name=crtbeginS.o`
-CFINI := `gcc --print-file-name=crtendS.o` $(LIB_DIR)/crt/x86_64/crtn.o
+# runtime library
+INIT = $(RT1) $(RTI) `gcc --print-file-name=crtbeginT.o`
+FINI = `gcc --print-file-name=crtend.o` $(RTN) $(RT3)
 
 # Flags, Libraries and Includes
 CFLAGS := -g -march=native -fno-strict-aliasing -fwrapv -fms-extensions -Wno-microsoft-anon-tag
-STATIC := -nodefaultlibs -nostartfiles -nostdinc -static
-AFLAGS := -f elf64
+STATIC := -ffreestanding -nodefaultlibs -nostartfiles -nostdinc -static
+AFLAGS := -g
 INCS   := -I $(SYS_DIR)/$(OS)/$(ARCH) -I $(SYS_DIR)/$(OS)/port -I $(INC_DIR) -isystem $(INC_DIR)/vendor/libc
 ELIBS  := -L$(LIB_DIR) -lc
 
 # Named generic rules (must be evaluated lazily)
 COMPILE  = @echo "CC 	"$(@:$(OBJ_DIR)/%=%);\
-		   $(CC) -MD $(CFLAGS) $(TCFLAGS) $(INCS) $(TINCS) -o $@ -c $<
+		   $(CC) -MD $(CFLAGS) $(STATIC) $(TCFLAGS) $(INCS) $(TINCS) -o $@ -c $<
 LINK 	 = @echo "LD 	"$(@:$(OBJ_DIR)/%=%);\
-		   $(CC) -MD $(CFLAGS) $(STATIC) $(TCFLAGS) -o $@ $(CINIT) $< $(CFINI) $(TLIBS) $(ELIBS)
+		   $(CC) -MD $(CFLAGS) $(STATIC) $(TCFLAGS) -o $@ $(INIT) $< $(TLIBS) $(ELIBS) $(FINI)
 COMPLINK = @echo "CC 	"$(@:$(OBJ_DIR)/%=%);\
-		   $(CC) -MD $(CFLAGS) $(STATIC) $(TCFLAGS) $(INCS) $(TINCS) -o $@ $(CINIT) $^ $(CFINI) $(TLIBS) $(ELIBS)
+		   $(CC) -MD $(CFLAGS) $(STATIC) $(TCFLAGS) $(INCS) $(TINCS) -o $@ $(INIT) $^ $(TLIBS) $(ELIBS) $(FINI)
 ASSEMBLE = @echo "AS	"$(@:$(OBJ_DIR)/%=%);\
-		   $(AS) $(AFLAGS) $(TCFLAGS) -o $@ $<
+		   $(AS) $(AFLAGS) -o $@ -c $<
 ARCHIVE  = @echo "AR	"$(@:$(OBJ_DIR)/%=%);\
 		   $(AR) crs $@ $^
 
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