From a45406396cd255bbd3c417b6ccca6b603ed69e2c Mon Sep 17 00:00:00 2001 From: Andreas Jaeger Date: Sat, 3 Feb 2001 21:32:06 +0000 Subject: Update. * sysdeps/i386/elf/start.S (_start): Align stack to 16-byte boundary for SSE/SSE-2 alignment. --- sysdeps/i386/elf/start.S | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) (limited to 'sysdeps/i386') diff --git a/sysdeps/i386/elf/start.S b/sysdeps/i386/elf/start.S index 868323b..fb54066 100644 --- 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 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 + for pointing this out. */ + andl $0xfffffff0, %esp pushl %eax /* Push garbage because we allocate 28 more bytes. */ -- cgit v1.1