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# Copyright (c) 2020 Johannes Stoelp
COMMON_CFLAGS := -g -O0 -Wall -Wextra \
-I../lib/include \
-nostartfiles -nodefaultlibs
run: main
./$<
main: dynld.so main.c ../lib/libcommon.a
@# For now ew only add support for ELF hash tables (DT_HASH).
@# Therefore we specify the `hash-style` below.
gcc -o libgreet.so \
$(COMMON_CFLAGS) \
-fPIC -shared \
-Wl,--hash-style=sysv \
libgreet.c
@if readelf -W -S libgreet.so | grep plt >& /dev/null; then \
echo "ERROR: libgreet.so contains PLT while we don't support relocation calls in libgreet.so!"; \
echo " All function calls in libgreet.so must be statically resolved!"; \
exit 1; \
fi
@# For now ew only add support for ELF hash tables (DT_HASH).
@# Therefore we specify the `hash-style` below.
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 $@
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 -W -S $@ | grep plt >& /dev/null; then \
echo "ERROR: $@ contains PLT while we don't support relocation calls in $@!"; \
echo " All function calls in $@ must be statically resolved!"; \
exit 1; \
fi
../lib/libcommon.a:
make -C ../lib
clean:
rm -f main libgreet.so
rm -f dynld.so
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