From 287f736e614a2931f57e9aabf42105e3cf3e8992 Mon Sep 17 00:00:00 2001
From: johannst <johannes.stoelp@gmail.com>
Date: Sat, 17 Apr 2021 23:47:17 +0200
Subject: 04: able to map dependency & resolve reolcs and execture main program
 (initial commit)

---
 04_dynld_nostd/Makefile | 60 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 04_dynld_nostd/Makefile

(limited to '04_dynld_nostd/Makefile')

diff --git a/04_dynld_nostd/Makefile b/04_dynld_nostd/Makefile
new file mode 100644
index 0000000..8cd9d35
--- /dev/null
+++ b/04_dynld_nostd/Makefile
@@ -0,0 +1,60 @@
+# 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
-- 
cgit v1.2.3