feat: add support for aarch64 timer/interrupts, port MontaukOS userspace

programs/lib/libc/Makefile

@@ -6,7 +6,7 @@ MAKEFLAGS += -rR
 
 # ---- Toolchain ----
 
-TOOLCHAIN_PREFIX := $(shell cd ../../.. && pwd)/toolchain/local/bin/x86_64-montauk-
+include ../../mk/arch.mk
 ifneq ($(wildcard $(TOOLCHAIN_PREFIX)gcc),)
     CC := $(TOOLCHAIN_PREFIX)gcc
     AR := $(TOOLCHAIN_PREFIX)ar
@@ -20,7 +20,7 @@ endif
 # ---- Paths ----
 
 LIBC_INC := ../../include/libc
-OBJDIR   := obj
+OBJDIR   := obj$(ARCH_SUFFIX)
 CRTDIR   := crt
 ASM_OBJS := $(OBJDIR)/setjmp.o
 
@@ -38,12 +38,8 @@ CFLAGS := \
     -fno-PIC \
     -ffunction-sections \
     -fdata-sections \
-    -m64 \
-    -march=x86-64 \
-    -msse \
-    -msse2 \
-    -mno-red-zone \
-    -mcmodel=small \
+    $(ARCH_CFLAGS) \
+    $(ARCH_FP_FLAGS) \
     -isystem $(LIBC_INC) \
     -isystem $(shell $(CC) -print-file-name=include)
 
@@ -55,18 +51,16 @@ CRT_CFLAGS := \
     -fno-stack-protector \
     -fno-stack-check \
     -fno-PIC \
-    -m64 \
-    -march=x86-64 \
-    -mno-red-zone \
+    $(ARCH_CFLAGS) \
     -fno-tree-loop-distribute-patterns \
     -isystem $(LIBC_INC) \
     -isystem $(shell $(CC) -print-file-name=include)
 
 # ---- Target ----
 
-TARGET := liblibc.a
-SDK_TARGET := liblibc-full.a
-CRT_OBJS := crt1.o crti.o crtn.o
+TARGET := $(ARCH_OUT)liblibc.a
+SDK_TARGET := $(ARCH_OUT)liblibc-full.a
+CRT_OBJS := $(ARCH_OUT)crt1.o $(ARCH_OUT)crti.o $(ARCH_OUT)crtn.o
 
 .PHONY: all clean
 
@@ -77,6 +71,7 @@ all: $(TARGET) $(SDK_TARGET) $(CRT_OBJS)
 # a float leave the decimal-conversion and pow/exp/log code behind. Programs
 # that do need %e/%f/%g must link with -Wl,-u,_pf_putfloat to force it in.
 $(TARGET): $(OBJDIR)/libc.o $(OBJDIR)/printf_float.o $(ASM_OBJS)
+	@mkdir -p $(dir $@)
 	$(AR) rcs $@ $^
 
 $(OBJDIR)/libc.o: libc.c printf_internal.h Makefile
@@ -87,7 +82,7 @@ $(OBJDIR)/printf_float.o: printf_float.c printf_internal.h Makefile
 	@mkdir -p $(OBJDIR)
 	$(CC) $(CFLAGS) -c $< -o $@
 
-$(OBJDIR)/setjmp.o: setjmp.S Makefile
+$(OBJDIR)/setjmp.o: arch/setjmp-$(ARCH).S Makefile
 	@mkdir -p $(OBJDIR)
 	$(CC) $(CFLAGS) -c $< -o $@
 
@@ -97,18 +92,22 @@ $(OBJDIR)/setjmp.o: setjmp.S Makefile
 # compiled ON MontaukOS. Function-level --gc-sections still applies to the
 # rest; only the float path is pinned. Image size is not a concern here.
 $(SDK_TARGET): $(OBJDIR)/libc-merged.o $(ASM_OBJS)
+	@mkdir -p $(dir $@)
 	$(AR) rcs $@ $^
 
 $(OBJDIR)/libc-merged.o: $(OBJDIR)/libc.o $(OBJDIR)/printf_float.o
 	$(LD) -r -o $@ $(OBJDIR)/libc.o $(OBJDIR)/printf_float.o
 
-crt1.o: $(CRTDIR)/crt1.c Makefile
+$(ARCH_OUT)crt1.o: $(CRTDIR)/crt1.c Makefile
+	@mkdir -p $(dir $@)
 	$(CC) $(CRT_CFLAGS) -c $< -o $@
 
-crti.o: $(CRTDIR)/crti.c Makefile
+$(ARCH_OUT)crti.o: $(CRTDIR)/crti.c Makefile
+	@mkdir -p $(dir $@)
 	$(CC) $(CRT_CFLAGS) -c $< -o $@
 
-crtn.o: $(CRTDIR)/crtn.c Makefile
+$(ARCH_OUT)crtn.o: $(CRTDIR)/crtn.c Makefile
+	@mkdir -p $(dir $@)
 	$(CC) $(CRT_CFLAGS) -c $< -o $@
 
 clean: