Update.

	* sysdeps/i386/elf/start.S (_start): Align stack to 16-byte
	boundary for SSE/SSE-2 alignment.

diff --git a/ChangeLog b/ChangeLog
index 110a5ca..e289571 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2001-02-03  Andreas Jaeger  <aj@suse.de>
 
+       * sysdeps/i386/elf/start.S (_start): Align stack to 16-byte
+       boundary for SSE/SSE-2 alignment.
+
        * posix/Makefile ($(objpfx)annexc.out): Also pass sysincludes to
        isomac.
 

diff --git a/sysdeps/i386/elf/start.S b/sysdeps/i386/elf/start.S
index 868323b..fb54066 100644 (file)
--- a/sysdeps/i386/elf/start.S
+++ b/sysdeps/i386/elf/start.S
@@ -22,12 +22,12 @@
    point runs, most registers' values are unspecified, except for:
 
    %edx                Contains a function pointer to be registered with `atexit'.
-               This is how the dynamic linker arranges to have DT_FINI
+               This is how the dynamic linker arranges to have DT_FINI
                functions called for shared libraries that have been loaded
                before this code runs.
 
    %esp                The stack contains the arguments and environment:
-               0(%esp)                 argc
+               0(%esp)                 argc
                4(%esp)                 argv[0]
                ...
                (4*argc)(%esp)          NULL
@@ -51,10 +51,11 @@ _start:
        popl %esi               /* Pop the argument count.  */
        movl %esp, %ecx         /* argv starts just at the current stack top.*/
 
-       /* Before pushing the arguments align the stack to a double word
-          boundary to avoid penalties from misaligned accesses.  Thanks
-          to Edward Seidl <seidl@janed.com> for pointing this out.  */
-       andl $0xfffffff8, %esp
+       /* Before pushing the arguments align the stack to a 16-byte
+       (SSE needs 16-byte alignment) boundary to avoid penalties from
+       misaligned accesses.  Thanks to Edward Seidl <seidl@janed.com>
+       for pointing this out.  */
+       andl $0xfffffff0, %esp
        pushl %eax              /* Push garbage because we allocate
                                   28 more bytes.  */