diff options
Diffstat (limited to '04_dynld_nostd/Makefile')
| -rw-r--r-- | 04_dynld_nostd/Makefile | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/04_dynld_nostd/Makefile b/04_dynld_nostd/Makefile new file mode 100644 index 0000000..e4dceb1 --- /dev/null +++ b/04_dynld_nostd/Makefile @@ -0,0 +1,63 @@ +# Copyright (c) 2020 Johannes Stoelp + +COMMON_CFLAGS := -g -O0 -Wall -Wextra \ + -I../lib/include \ + -nostartfiles -nodefaultlibs + +run: main + ./$< + +# Build the example user program. +# +# We explicitly set the dynamic linker to `dynld.so` and use the ELF hash table +# (DT_HASH), as we didn't implement support for the GNU hash table in our +# dynamic linker. +main: dynld.so libgreet.so main.c ../lib/libcommon.a + gcc -o $@ \ + $(COMMON_CFLAGS) \ + -L$(CURDIR) -lgreet \ + -Wl,--dynamic-linker=$(CURDIR)/dynld.so \ + -Wl,--hash-style=sysv \ + -no-pie \ + $(filter %.c %.a, $^) + + #readelf -W --dynamic $@ + #readelf -W --program-headers $@ + #objdump --disassemble -j .plt -M intel $@ + #objdump --disassemble=_start -M intel $@ + +# Build the example shared library. +# +# We explicitly use the ELF hash table (DT_HASH), as we didn't implement +# support for the GNU hash table in our dynamic linker. +libgreet.so: libgreet.c + gcc -o $@ \ + $(COMMON_CFLAGS) \ + -fPIC -shared \ + -Wl,--hash-style=sysv \ + $^ + +# Build the dynamic linker. +# +# We assert that the dynamic linker doesn't contain any relocations as we +# didn't implement support to resolve its own relocations. +dynld.so: dynld.S dynld.c ../lib/libcommon.a + gcc -o $@ \ + $(COMMON_CFLAGS) \ + -fPIC -static-pie \ + -fvisibility=hidden \ + -Wl,--entry=dl_start \ + -Wl,--no-allow-shlib-undefined \ + $^ + + @if ! readelf -r $@ | grep 'There are no relocations in this file' >& /dev/null; then \ + echo "ERROR: $@ contains relocations while we don't support relocations in $@!"; \ + exit 1; \ + fi + +../lib/libcommon.a: + make -C ../lib + +clean: + rm -f main libgreet.so + rm -f dynld.so |