a6e6e3d8ca
- Created apps/hello-world/hello-world.S: AT&T assembly user program that calls SYS_WRITE to print 'Hello, World' then SYS_EXIT(0) - Created apps/user.ld: linker script for user apps at 0x08048000 - Created scripts/build_apps.sh: builds each app dir into flat binary - Updated CMakeLists.txt: added apps build target in ISO pipeline - Updated gen_initrd.sh: packs built binaries from build/apps_bin/ - Updated kernel.c: replaced inline machine code with VFS-based loading of hello-world from /initrd/hello-world via cpio_find() Verified: hello-world binary (49 bytes) loads from CPIO initrd, prints 'Hello, World', and exits with code 0.
50 lines
1.4 KiB
Bash
Executable File
50 lines
1.4 KiB
Bash
Executable File
#!/bin/sh
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# Build all user-mode applications as flat binaries.
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# Usage: build_apps.sh <apps_dir> <output_dir>
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# Each app directory in <apps_dir>/ gets compiled and its flat binary
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# is placed in <output_dir>/.
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set -e
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APPS_DIR="$1"
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OUTPUT_DIR="$2"
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LINKER_SCRIPT="$APPS_DIR/user.ld"
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CC="${CC:-clang}"
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OBJCOPY="${OBJCOPY:-objcopy}"
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CFLAGS="-ffreestanding -m32 -fno-pie -fno-pic -fno-builtin -fno-stack-protector -mno-sse -mno-mmx -O2 -Wall"
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LDFLAGS="-m32 -nostdlib -no-pie -Wl,--no-dynamic-linker"
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mkdir -p "$OUTPUT_DIR"
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for app_dir in "$APPS_DIR"/*/; do
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[ -d "$app_dir" ] || continue
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app_name=$(basename "$app_dir")
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echo "Building app: $app_name"
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# Collect source files
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OBJ_FILES=""
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for src in "$app_dir"*.S "$app_dir"*.c; do
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[ -f "$src" ] || continue
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obj="$OUTPUT_DIR/${app_name}_$(basename "${src%.*}").o"
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$CC $CFLAGS -c "$src" -o "$obj"
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OBJ_FILES="$OBJ_FILES $obj"
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done
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if [ -z "$OBJ_FILES" ]; then
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echo " No sources found, skipping"
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continue
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fi
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# Link into ELF
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elf="$OUTPUT_DIR/$app_name.elf"
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$CC $LDFLAGS -T "$LINKER_SCRIPT" $OBJ_FILES -o "$elf"
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# Convert to flat binary (strip non-code sections)
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bin="$OUTPUT_DIR/$app_name"
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$OBJCOPY -O binary --only-section=.text --only-section=.rodata --only-section=.data "$elf" "$bin"
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size=$(wc -c < "$bin")
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echo " Built: $bin ($size bytes)"
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done
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