sparc: Fix argument passing to __libc_start_main (BZ 32981)

sparc start.S does not provide the final argument for
__libc_start_main, which is the highest stack address used to
update the __libc_stack_end.A

This fixes elf/tst-execstack-prog-static-tunable on sparc64.
On sparcv9 this does not happen because the kernel puts an
auxv value, which turns to point to a value in the stack itself.

Checked on sparc64-linux-gnu.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

diff --git a/sysdeps/sparc/sparc32/start.S b/sysdeps/sparc/sparc32/start.S
index 694b020ce0defff4b73eb0415d8fdbe1b1c3e262..cef7c96cac7253f9093c3bc6d54d714f17013ca5 100644 (file)
--- a/sysdeps/sparc/sparc32/start.S
+++ b/sysdeps/sparc/sparc32/start.S
@@ -73,6 +73,10 @@ _start:
      be NULL.  */
        mov     %g1, %o5
 
+  /* Provide the highest stack address to update the __libc_stack_end (used
+     to enable executable stacks if required).  */
+       st      %sp, [%sp+23*4]
+
   /* Let libc do the rest of the initialization, and call main.  */
        call    __libc_start_main
         nop

diff --git a/sysdeps/sparc/sparc64/start.S b/sysdeps/sparc/sparc64/start.S
index c9c25c2e4794a0405996dd93d88e06cf5604206f..08e1e77210540cdac66493c22fe9b3c6859c9cd1 100644 (file)
--- a/sysdeps/sparc/sparc64/start.S
+++ b/sysdeps/sparc/sparc64/start.S
@@ -74,6 +74,10 @@ _start:
      be NULL.  */
        mov     %g1, %o5
 
+  /* Provide the highest stack address to update the __libc_stack_end (used
+     to enable executable stacks if required).  */
+       stx     %sp, [%sp+STACK_BIAS+22*8]
+
   /* Let libc do the rest of the initialization, and call main.  */
        call    __libc_start_main
         nop