Provide a mechanism for dumping relocation information.

Setting the LD_DUMP_REL_PRE or LD_DUMP_REL_POST environment variables
cause rtld-elf to output a table of all relocations.

This is useful for debugging.

1 files changed, 10 insertions, 0 deletions

diff --git a/libexec/rtld-elf/rtld.c b/libexec/rtld-elf/rtld.c
index 6bc1f77..484cd8d 100644
--- a/libexec/rtld-elf/rtld.c
+++ b/libexec/rtld-elf/rtld.c
@@ -365,6 +365,11 @@ _rtld(Elf_Addr *sp, func_ptr_type *exit_proc, Obj_Entry **objp)
 	exit(0);
     }
 
+    if (getenv("LD_DUMP_REL_PRE") != NULL) {
+       dump_relocations(obj_main);
+       exit (0);
+    }
+
     if (relocate_objects(obj_main,
 	ld_bind_now != NULL && *ld_bind_now != '\0', &obj_rtld) == -1)
 	die();
@@ -373,6 +378,11 @@ _rtld(Elf_Addr *sp, func_ptr_type *exit_proc, Obj_Entry **objp)
     if (do_copy_relocations(obj_main) == -1)
 	die();
 
+    if (getenv("LD_DUMP_REL_POST") != NULL) {
+       dump_relocations(obj_main);
+       exit (0);
+    }
+
     dbg("initializing key program variables");
     set_program_var("__progname", argv[0] != NULL ? basename(argv[0]) : "");
     set_program_var("environ", env);