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* sysdeps/i386/elf/start.S (_start): Align stack to 16-byte
	boundary for SSE/SSE-2 alignment.
This commit is contained in:
Andreas Jaeger 2001-02-03 21:32:06 +00:00
parent 72a2ebb40f
commit a45406396c
2 changed files with 10 additions and 6 deletions
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3
ChangeLog
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@ -1,5 +1,8 @@
2001-02-03 Andreas Jaeger <aj@suse.de> 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 ($(objpfx)annexc.out): Also pass sysincludes to * posix/Makefile ($(objpfx)annexc.out): Also pass sysincludes to
isomac. isomac.

13
sysdeps/i386/elf/start.S
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@ -22,12 +22,12 @@
point runs, most registers' values are unspecified, except for: point runs, most registers' values are unspecified, except for:
%edx Contains a function pointer to be registered with `atexit'. %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 functions called for shared libraries that have been loaded
before this code runs. before this code runs.
%esp The stack contains the arguments and environment: %esp The stack contains the arguments and environment:
0(%esp) argc 0(%esp) argc
4(%esp) argv[0] 4(%esp) argv[0]
... ...
(4*argc)(%esp) NULL (4*argc)(%esp) NULL
@ -51,10 +51,11 @@ _start:
popl %esi /* Pop the argument count. */ popl %esi /* Pop the argument count. */
movl %esp, %ecx /* argv starts just at the current stack top.*/ movl %esp, %ecx /* argv starts just at the current stack top.*/
/* Before pushing the arguments align the stack to a double word /* Before pushing the arguments align the stack to a 16-byte
boundary to avoid penalties from misaligned accesses. Thanks (SSE needs 16-byte alignment) boundary to avoid penalties from
to Edward Seidl <seidl@janed.com> for pointing this out. */ misaligned accesses. Thanks to Edward Seidl <seidl@janed.com>
andl $0xfffffff8, %esp for pointing this out. */
andl $0xfffffff0, %esp
pushl %eax /* Push garbage because we allocate pushl %eax /* Push garbage because we allocate
28 more bytes. */ 28 more bytes. */