Add IFUNC support for arm64 and IRELATIVE reloc
There are number of changes in the way IFUNC related relocations are done:
1. IRELATIVE relocations are now supported for x86/x86_64 and arm64.
2. IFUNC relocations are now relying on static linker to generate
them in correct order - this removes necessety of additional
relocation pass for ifuncs.
3. Related to 2: rela?.dyn relocations are preformed before .plt ones.
4. Ifunc are resolved on symbol lookup this approach allowed to avoid
mprotect(PROT_WRITE) call on r-x program segments.
Bug: 17399706
Bug: 17177284
(cherry picked from commit 9aea164457c269c475592da36b4655d45f55c7bc)
Change-Id: Ie19d900fc203beb93faf8943b0d06d534a6de4ad
diff --git a/tests/libs/dlopen_testlib_ifunc.c b/tests/libs/dlopen_testlib_ifunc.c
index 4874841..b68a3dd 100644
--- a/tests/libs/dlopen_testlib_ifunc.c
+++ b/tests/libs/dlopen_testlib_ifunc.c
@@ -23,8 +23,17 @@
g_flag = 1;
}
+static const char* is_ctor_called() __attribute__ ((ifunc("is_ctor_called_ifun")));
+
const char* foo() __attribute__ ((ifunc ("foo_ifunc")));
-const char* is_ctor_called() __attribute__ ((ifunc("is_ctor_called_ifun")));
+
+// Static linker creates GLOBAL/IFUNC symbol and JUMP_SLOT relocation type for plt segment
+const char* is_ctor_called_jump_slot() __attribute__ ((ifunc("is_ctor_called_ifun")));
+
+const char* is_ctor_called_irelative() {
+ // Call internal ifunc-resolved function with IRELATIVE reloc
+ return is_ctor_called();
+}
const char* return_true() {
return "true";