Add a make target to run the readelf utility on a compiled program

The readelf utility (already shipped with the solana tools) shows meta-information about ELF files, such as symbol tables. It is useful for investigating "unresolved symbol" errors that crop up at runtime.

This commit also fixes the objdump flags (two dashes are required and there is no "color" option) as well as a few typos.

sdk/bpf/c/bpf.mk

@@ -22,6 +22,7 @@ CC := $(LLVM_DIR)/bin/clang
 CXX := $(LLVM_DIR)/bin/clang++
 LLD := $(LLVM_DIR)/bin/ld.lld
 OBJ_DUMP := $(LLVM_DIR)/bin/llvm-objdump
+READ_ELF := $(LLVM_DIR)/bin/llvm-readelf
 endif
 
 SYSTEM_INC_DIRS := \
@@ -64,9 +65,11 @@ BPF_LLD_FLAGS := \
   --entry entrypoint \
 
 OBJ_DUMP_FLAGS := \
-  -color \
-  -source \
-  -disassemble \
+  --source \
+  --disassemble \
+
+READ_ELF_FLAGS := \
+  --all \
 
 TESTFRAMEWORK_RPATH := $(abspath $(LOCAL_PATH)../dependencies/criterion/lib)
 TESTFRAMEWORK_FLAGS := \
@@ -122,7 +125,8 @@ help:
 	@echo '  - make all - Build all the programs and tests, run the tests'
 	@echo '  - make programs - Build all the programs'
 	@echo '  - make tests - Build and run all tests'
-	@echo '  - make dump_<program name> - Dumps the contents of the program to stdout'
+	@echo '  - make dump_<program name> - Dump the contents of the program to stdout'
+	@echo '  - make readelf_<program name> - Display information about the ELF binary'
 	@echo '  - make <program name> - Build a single program by name'
 	@echo '  - make <test name> - Build and run a single test by name'
 	@echo ''
@@ -133,7 +137,7 @@ help:
 	$(foreach name, $(TEST_NAMES), @echo '  - $(name)'$(\n))
 	@echo ''
 	@echo 'Example:'
-	@echo '  - Assuming a programed named foo (src/foo/foo.c)'
+	@echo '  - Assuming a program named foo (src/foo/foo.c)'
 	@echo '    - make foo'
 	@echo '    - make dump_foo'
 	@echo ''
@@ -247,5 +251,8 @@ tests: $(TEST_NAMES)
 dump_%: %
 	$(_@)$(OBJ_DUMP) $(OBJ_DUMP_FLAGS) $(addprefix $(OUT_DIR)/, $(addsuffix .so, $<))
 
+readelf_%: %
+	$(_@)$(READ_ELF) $(READ_ELF_FLAGS) $(addprefix $(OUT_DIR)/, $(addsuffix .so, $<))
+
 clean:
 	rm -rf $(OUT_DIR)