ldso: Add support for LD_WARN and LD_TRACE_PRELINKING

Added support for the following tracing capabilities:
- LD_WARN to warn about undefined symbols during the lookup stage.
- LD_TRACE_PRELINKING to trace the needed libraries of the object
  that we are prelinking.

Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/ldso/include/dl-hash.h b/ldso/include/dl-hash.h
index f47384c31..e138e1d4b 100644
--- a/ldso/include/dl-hash.h
+++ b/ldso/include/dl-hash.h
@@ -25,6 +25,10 @@ struct dyn_elf {
   struct dyn_elf * prev;
 };
 
+struct sym_val {
+  const ElfW(Sym) *s;
+  struct elf_resolve *m;
+};
 
 /* Structure to describe a single list of scope elements.  The lookup
    functions get passed an array of pointers to such structures.  */
@@ -154,17 +158,17 @@ extern struct elf_resolve * _dl_add_elf_hash_table(const char * libname,
 
 /* Only need extra arg with some configurations */
 #if !((defined(USE_TLS) && USE_TLS) || defined __FDPIC__)
-# define _dl_lookup_hash(n, r, m, c, t) _dl_lookup_hash(n, r, m, c)
+# define _dl_lookup_hash(n, r, m, s, c, t) _dl_lookup_hash(n, r, m, s, c)
 #endif
 extern char *_dl_lookup_hash(const char *name, struct r_scope_elem *scope,
-	struct elf_resolve *mytpnt, int type_class,
+	struct elf_resolve *mytpnt, struct sym_val *symbol, int type_class,
 	struct elf_resolve **tpntp);
 
 static __always_inline char *_dl_find_hash(const char *name, struct r_scope_elem *scope,
-					struct elf_resolve *mytpnt, int type_class,
+					struct elf_resolve *mytpnt, struct sym_val *symbol, int type_class,
 					struct elf_resolve **tpntp)
 {
-	return _dl_lookup_hash(name, scope, mytpnt, type_class, tpntp);
+	return _dl_lookup_hash(name, scope, mytpnt, symbol, type_class, tpntp);
 }
 
 extern int _dl_linux_dynamic_link(void);