use indirect call to make system calls

Makerules

@@ -543,8 +543,8 @@ $(LINK.o) -shared -static-libgcc -Wl,-O1 $(sysdep-LDFLAGS) \
 	  $(extra-B-$(@F:lib%.so=%).so) $(load-map-file) \
 	  -Wl,-soname=lib$(libprefix)$(@F:lib%.so=%).so$($(@F)-version) \
 	  $(LDFLAGS.so) $(LDFLAGS-lib.so) $(LDFLAGS-$(@F:lib%.so=%).so) \
-	  -L$(subst :, -L,$(rpath-link)) -Wl,-rpath-link=$(rpath-link) \
-	  $(objdir)/../entry-patch.o
+	  -L$(subst :, -L,$(rpath-link)) -L$(common-objpfx).. -Wl,-rpath-link=$(rpath-link):$(common-objpfx).. \
+	  -Wl,-rpath=/data
 endef
 
 ifeq (yes,$(use-default-link))
@@ -593,7 +593,9 @@ endif
 
 define build-shlib
 $(build-shlib-helper) -o $@ $(shlib-lds-flags) \
-	  $(csu-objpfx)abi-note.o $(build-shlib-objlist)
+	  $(csu-objpfx)abi-note.o $(build-shlib-objlist) \
+	  $(common-objpfx)../entry-patch.o $(common-objpfx)../undefined_sys_hack.o \
+	  -luklsyms
 endef
 
 define build-module-helper

csu/init-first.c

@@ -46,10 +46,13 @@ __libc_init_first (int argc, char **argv, char **envp)
   /* For DSOs we do not need __libc_init_first but instead _init.  */
 }
 
+extern void *entry_SYSCALL_64;
+
 void
 attribute_hidden
-_init (int argc, char **argv, char **envp)
+_init (int argc, char **argv, char **envp, void* dl_entry_SYSCALL_64)
 {
+  entry_SYSCALL_64 = dl_entry_SYSCALL_64;
 #endif
 
   __libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;

elf/Makefile

@@ -540,7 +540,8 @@ $(objpfx)ld.so: $(objpfx)librtld.os $(ld-map)
 		  $(LDFLAGS-rtld) -Wl,-z,defs $(z-now-$(bind-now))	\
 		  $(filter-out $(map-file),$^) $(load-map-file)		\
 		  -Wl,-soname=$(rtld-installed-name)			\
-		  -Wl,-defsym=_begin=0
+		  -Wl,-defsym=_begin=0 \
+		  $(common-objpfx)../entry-patch.o
 	$(call after-link,$@.new)
 	$(READELF) -s $@.new \
 	  | $(AWK) '($$7 ~ /^UND(|EF)$$/ && $$1 != "0:" && $$4 != "REGISTER") { print; p=1 } END { exit p != 0 }'

elf/dl-init.c

@@ -22,7 +22,7 @@
 
 /* Type of the initializer.  */
 typedef void (*init_t) (int, char **, char **);
-
+typedef void (*ukl_init_t) (int, char **, char **, void *);
 
 static void
 call_init (struct link_map *l, int argc, char **argv, char **env)

sysdeps/generic/ldsodefs.h

@@ -99,8 +99,11 @@ typedef struct link_map *lookup_t;
 # define DL_SYMBOL_ADDRESS(map, ref) \
  (void *) SYMBOL_ADDRESS (map, ref, false)
 # define DL_LOOKUP_ADDRESS(addr) ((ElfW(Addr)) (addr))
+
+// XXX since ukl only supports x86_64, i'm not sure this should actually go here
+extern void* entry_SYSCALL_64;
 # define DL_CALL_DT_INIT(map, start, argc, argv, env) \
- ((init_t) (start)) (argc, argv, env)
+ ((ukl_init_t) (start)) (argc, argv, env, entry_SYSCALL_64)
 # define DL_CALL_DT_FINI(map, start) ((fini_t) (start)) ()
 #endif
 

sysdeps/hppa/dl-lookupcfg.h

@@ -56,8 +56,8 @@ void attribute_hidden _dl_unmap (struct link_map *map);
 {							\
   ElfW(Addr) addr;					\
   DL_DT_FUNCTION_ADDRESS(map, start, , addr)		\
-  init_t init = (init_t) addr; 				\
-  init (argc, argv, env);				\
+  ukl_init_t init = (ukl_init_t) addr; 			\
+  init (argc, argv, env, entry_SYSCALL_64);		\
 }
 
 #define DL_CALL_DT_FINI(map, start)		\

sysdeps/unix/sysv/linux/ukl/libdef.py

@@ -0,0 +1,10 @@
+import sys
+
+while True:
+    line = sys.stdin.readline()
+    if not len(line):
+        break
+    line = line.strip().split()
+    for fname in line:
+        if not any(["libc_hidden_def" in line for line in open(fname)]):
+            print(fname)

sysdeps/unix/sysv/linux/x86_64/sysdep.h

@@ -217,7 +217,9 @@
    x32.  */
 #define ARGIFY(X) ((__typeof__ ((X) - (X))) (X))
 
-#ifdef UKL_BP
+// getting rtld to use the plt is more trouble than it's worth,
+// so just have it always use UKL base model
+#if defined(UKL_BP) && !IS_IN(rtld)
 
 extern int get_bypass_syscall(void);