ld: generate symbol map from base/lib/symbols/ld

This patch removes the manually maintained symbol map from the dynamic
linker. This way, the symbol map stays in sync with the ABI and - more
importantly - no longer uses wildcards. So the symbols exported by the
dynamic linker are strictly limited by the ABI.

Issue #2190

repos/base/lib/mk/ld-platform.inc

@@ -11,7 +11,18 @@ SRC_CC       = main.cc test.cc exception.cc dependency.cc debug.cc \
 SRC_S        = jmp_slot.s
 INC_DIR     += $(DIR)/include
 INC_DIR     += $(BASE_DIR)/src/include
-LD_OPT      += -Bsymbolic-functions --version-script=$(DIR)/symbol.map
+LD_OPT      += -Bsymbolic-functions --version-script=symbol.map
+
+#
+# Generate symbol map from the ABI
+#
+$(LIB).lib.so: symbol.map
+symbol.map: $(MAKEFILE_LIST)
+symbol.map: $(BASE_DIR)/lib/symbols/ld
+	$(MSG_CONVERT)$@
+	$(VERBOSE)(echo -e "{\n\tglobal:";\
+	           sed -n "s/^\(\w\+\) .*/\t\t\1;/p" $<;\
+	           echo -e "\tlocal: *;\n};") > $@
 
 ifneq ($(filter linux, $(SPECS)),)
 

repos/base/lib/mk/ld.mk

@@ -19,7 +19,6 @@ SYMBOLS := $(BASE_DIR)/lib/symbols/ld
 
 SHARED_LIB := yes
 
-LD_OPT += -Bsymbolic-functions --version-script=$(BASE_DIR)/src/lib/ldso/symbol.map
 LD_OPT += -T$(BASE_DIR)/src/lib/ldso/linker.ld
 
 symbols.s: $(MAKEFILE_LIST)

repos/base/src/lib/ldso/symbol.map

@@ -1,100 +0,0 @@
-/*
- * Symbols exported by the ld.lib.so
- */
-{
-	global:
-
-		/* We export all C++ symbols with prefix Genode::, as well as all vtables,
-		 * type informations and operators new and delete
-		 */
-		extern "C++" {
-			Genode::*;
-			*typeinfo*;
-			vtable*;
-			init_exception_handling*;
-			operator*new*;
-			operator*delete*;
-			genode_atexit*;
-			genode_exit*;
-			genode___cxa_finalize*;
-			genode_envp;
-			genode_argv;
-			genode_argc;
-		};
-		__dynamic_cast;
-
-		/*
-		 * Symbols for calls generated by the compiler (i.e., on ARM), and
-		 * provided by the C++ runtime.
-		 */
-		memcpy;
-		memset;
-		memmove;
-
-		/*
-		 * Debugging
-		 */
-		wait_for_continue;
-		stdout_write;
-		stdout_reconnect;
-
-		/* Testing */
-		extern "C++" {
-			__ldso_raise_exception*;
-		};
-
-		/* GNU verbose terminate handler */
-		extern "C++" { __gnu_cxx::__verbose_terminate_handler*; };
-
-		extern "C++" { std::terminate*; };
-		extern "C++" { std::bad_exception*; };
-		extern "C++" { std::exception*; };
-		extern "C++" { std::uncaught_exception*; };
-
-		/* x86 */
-		__cxa*;
-		_Unwind_Complete;
-		_Unwind_DeleteException;
-		_Unwind_Resume;
-		__gxx_personality_v0;
-		dl_iterate_phdr;
-
-		/* ARM */
-		__aeabi_*;
-		dl_unwind_find_exidx;
-
-		/*
-		 * Kernel specific symbols
-		 */
-
-		/* Fiasco.OC */
-		l4_utcb_wrap;
-		__l4_sys_direct_sycalls;
-		l4_atomic_cmpxchg;
-
-		extern "C++" {
-			main_thread_utcb*;
-		};
-
-		/* Linux */
-		lx_syscall;
-
-		/* Linux hybrid */
-		lx_environ;
-
-		/* Base HW */
-		extern "C++" {
-			Kernel::*;
-		};
-
-		/* Pistachio */
-		__L4_ThreadSwitch;
-		__L4_Ipc;
-
-	local:
-
-		/*
-		 * Everything else is local
-		 */
-		*;
-};