submitted-start-cfi

2018-05-18  Palmer Dabbelt  <palmer@sifive.com>

        PR 23125
        * sysdeps/riscv/start.S (ENTRY_POINT): Mark ra as undefined so
        backtraces can terminate if they reach this point.

Gbp-Pq: Topic riscv64
Gbp-Pq: Name submitted-start-cfi.diff

diff --git a/sysdeps/riscv/start.S b/sysdeps/riscv/start.S
index 4635ddb5eb8c54156bbe576d05ca45599927cd5f..93a80bc4a760021b7a8065e996758ed2ad9c81bc 100644 (file)
--- a/sysdeps/riscv/start.S
+++ b/sysdeps/riscv/start.S
@@ -43,6 +43,8 @@
    __libc_start_main wants this in a5.  */
 
 ENTRY (ENTRY_POINT)
+       /* Mark ra as undefined in order to stop unwinding here!  */
+       cfi_undefined (ra)
        call  .Lload_gp
        mv    a5, a0  /* rtld_fini.  */
        /* main may be in a shared library.  */