76 lines
2.0 KiB
Makefile
76 lines
2.0 KiB
Makefile
# Makefile for libmath shared library
|
|
# Builds libmath.lib at fixed address 0x400000 (relocated at load time)
|
|
|
|
# Target architecture.
|
|
ARCH := x86_64
|
|
|
|
# Toolchain
|
|
TOOLCHAIN_PREFIX := $(shell cd ../../.. && pwd)/toolchain/local/bin/x86_64-elf-
|
|
CXX := $(TOOLCHAIN_PREFIX)g++
|
|
NM := $(TOOLCHAIN_PREFIX)nm
|
|
STRIP := $(TOOLCHAIN_PREFIX)strip
|
|
|
|
# Compiler flags: freestanding, no stdlib
|
|
# Build as PIE so library code remains valid when loaded into a slot-specific
|
|
# base address by the kernel loader.
|
|
override CXXFLAGS := \
|
|
-std=gnu++20 \
|
|
-g -O2 -pipe \
|
|
-Wall \
|
|
-Wextra \
|
|
-nostdinc \
|
|
-ffreestanding \
|
|
-fno-stack-protector \
|
|
-fno-stack-check \
|
|
-fPIE \
|
|
-fno-rtti \
|
|
-fno-exceptions \
|
|
-ffunction-sections \
|
|
-fdata-sections \
|
|
-m64 \
|
|
-march=x86-64 \
|
|
-mno-80387 \
|
|
-mno-mmx \
|
|
-mno-sse \
|
|
-mno-sse2 \
|
|
-mno-red-zone \
|
|
-mcmodel=small \
|
|
-I ../../include \
|
|
-isystem ../../include/libc \
|
|
-isystem ../../include/montauk
|
|
|
|
# Linker flags: freestanding static ELF at fixed address
|
|
# Note: NOT using --gc-sections so all functions are kept
|
|
override LDFLAGS := \
|
|
-nostdlib \
|
|
-static \
|
|
-Wl,--build-id=none \
|
|
-Wl,-m,elf_x86_64 \
|
|
-T link.ld
|
|
|
|
# Output
|
|
OUTDIR := ../../bin/os
|
|
LIBNAME := libmath
|
|
LIBSRC := src/libmath.cpp
|
|
|
|
.PHONY: all clean
|
|
|
|
all: $(OUTDIR)/$(LIBNAME).lib $(OUTDIR)/$(LIBNAME).lib.sym
|
|
|
|
$(OUTDIR)/$(LIBNAME).lib: $(LIBSRC) Makefile
|
|
@mkdir -p $(OUTDIR)
|
|
$(CXX) $(CXXFLAGS) -c $(LIBSRC) -o src/libmath.o
|
|
$(CXX) $(CXXFLAGS) $(LDFLAGS) src/libmath.o -o $@
|
|
|
|
# Generate symbol file from nm output
|
|
# Format: "symbol_name,offset_in_hex"
|
|
$(OUTDIR)/$(LIBNAME).lib.sym: $(OUTDIR)/$(LIBNAME).lib
|
|
@mkdir -p $(OUTDIR)
|
|
@echo "# Symbol table for $(LIBNAME)" > $@
|
|
@echo "# This file maps symbol names to offsets from library base" >> $@
|
|
@$(NM) $(OUTDIR)/$(LIBNAME).lib | grep ' T ' | awk '{printf "%s,0x%x\n", $$3, strtonum("0x" $$1) - 0x400000}' >> $@
|
|
@echo "Generated symbol file: $@"
|
|
|
|
clean:
|
|
rm -rf ../../bin/os/$(LIBNAME).lib ../../bin/os/$(LIBNAME).lib.sym src/libmath.o
|