riscv: restore ABI compatibility (bug 24484)

The contents of the dynamic section are part of the ABI, thus DL_RO_DYN_SECTION cannot be changed.
yamahata · Jul 4, 2019 · 484b7af · 484b7af
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diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,8 @@
+2019-07-04  Andreas Schwab  <[email protected]>
+
+	[BZ #24484]
+	* sysdeps/riscv/ldsodefs.h (DL_RO_DYN_SECTION): Define.
+
 2019-07-04  Szabolcs Nagy  <[email protected]>
 
 	* sysdeps/aarch64/Makefile: Install sys/ifunc.h and add tests.

diff --git a/sysdeps/riscv/ldsodefs.h b/sysdeps/riscv/ldsodefs.h
@@ -38,6 +38,11 @@ struct La_riscv_retval;
 				       struct La_riscv_retval *,	\
 				       const char *);
 
+/* Although the RISC-V ABI does not specify that the dynamic section has
+   to be read-only, it needs to be kept for ABI compatibility.  */
+
+#define DL_RO_DYN_SECTION 1
+
 #include_next <ldsodefs.h>
 
 #endif