wip: shared library support

2026-04-05 15:14:07 +02:00
parent d6c0470c62
commit 01c242d4de
20 changed files with 1026 additions and 4 deletions
@@ -0,0 +1,73 @@
+# 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
+override CXXFLAGS := \
+    -std=gnu++20 \
+    -g -O2 -pipe \
+    -Wall \
+    -Wextra \
+    -nostdinc \
+    -ffreestanding \
+    -fno-stack-protector \
+    -fno-stack-check \
+    -fno-PIC \
+    -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)
+	@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