feat: revamp libraries to use ELF shared objects

programs/libs/libhello/Makefile

@@ -1,5 +1,5 @@
 # Makefile for libhello shared library
-# Builds libhello.lib at fixed address 0x400000 (relocated at load time)
+# Builds libhello.lib as an ELF shared object (ET_DYN).
 
 # Target architecture.
 ARCH := x86_64
@@ -7,12 +7,12 @@ ARCH := x86_64
 # Toolchain
 TOOLCHAIN_PREFIX := $(shell cd ../../.. && pwd)/toolchain/local/bin/x86_64-elf-
 CXX := $(TOOLCHAIN_PREFIX)g++
+LD := $(TOOLCHAIN_PREFIX)ld
 NM := $(TOOLCHAIN_PREFIX)nm
 STRIP := $(TOOLCHAIN_PREFIX)strip
 
 # Compiler flags: freestanding, no stdlib
-# Build as PIE so library-internal data references remain valid after the
-# kernel maps the image into a per-process library slot.
+# Build as PIC so the final ET_DYN image can be relocated by the kernel loader.
 override CXXFLAGS := \
     -std=gnu++20 \
     -g -O2 -pipe \
@@ -22,7 +22,7 @@ override CXXFLAGS := \
     -ffreestanding \
     -fno-stack-protector \
     -fno-stack-check \
-    -fPIE \
+    -fPIC \
     -fno-rtti \
     -fno-exceptions \
     -ffunction-sections \
@@ -40,14 +40,13 @@ override CXXFLAGS := \
     -isystem ../../../kernel/freestnd-c-hdrs/x86_64/include \
     -isystem ../../../kernel/freestnd-cxx-hdrs/x86_64/include
 
-# Linker flags: freestanding static ELF at fixed address
-# Note: NOT using --gc-sections so all functions are kept
+# Linker flags for a bare-metal ELF shared object.
 override LDFLAGS := \
-    -nostdlib \
-    -static \
-    -Wl,--build-id=none \
-    -Wl,-m,elf_x86_64 \
-    -T link.ld
+    -shared \
+    --build-id=none \
+    --hash-style=sysv \
+    -m elf_x86_64 \
+    -z max-page-size=0x1000
 
 # Output
 OUTDIR := ../../bin/os
@@ -56,7 +55,7 @@ LIBSRC := src/libhello.cpp
 
 .PHONY: all clean
 
-all: $(OUTDIR)/$(LIBNAME).lib $(OUTDIR)/$(LIBNAME).lib.sym
+all: $(OUTDIR)/$(LIBNAME).lib
 
 $(OUTDIR):
 	mkdir -p $@
@@ -68,16 +67,8 @@ src/stb_truetype_impl.o: src/stb_truetype_impl.cpp Makefile | $(OUTDIR)
 	$(CXX) $(CXXFLAGS) -c src/stb_truetype_impl.cpp -o $@
 
 $(OUTDIR)/$(LIBNAME).lib: src/libhello.o src/stb_truetype_impl.o
-	$(CXX) $(CXXFLAGS) $(LDFLAGS) src/libhello.o src/stb_truetype_impl.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: $@"
+	rm -f $(OUTDIR)/$(LIBNAME).lib.sym
+	$(LD) $(LDFLAGS) src/libhello.o src/stb_truetype_impl.o -o $@
 
 clean:
 	rm -rf ../../bin/os/$(LIBNAME).lib ../../bin/os/$(LIBNAME).lib.sym src/libhello.o src/stb_truetype_impl.o