On Tue, 14 Nov 2006 11:08:02 -0600
Neill Miller <[EMAIL PROTECTED]> wrote:
One more time, this time adding the -ffreestanding option after the
-fstack-protector option:
> > $ echo 'void f (void) { volatile char a[8]; a[3]; }' | gcc -S -x c -O2
> > -fstack-protector - -o -; uname -a; /lib/libc-*.so
boiler ~ # echo 'void f (void) { volatile char a[8]; a[3]; }' | gcc -S -x c -O2
-fstack-protector -ffreestanding - -o -; uname -a; /lib/libc-*.so
.file ""
.text
.p2align 4,,15
.globl f
.type f, @function
f:
pushl %ebp
movl %esp, %ebp
subl $24, %esp
movl %gs:20, %eax
movl %eax, -4(%ebp)
xorl %eax, %eax
movzbl -9(%ebp), %eax
movl -4(%ebp), %eax
xorl %gs:20, %eax
jne .L5
leave
ret
.L5:
call __stack_chk_fail
.size f, .-f
.ident "GCC: (GNU) 4.1.1 (Gentoo 4.1.1-r1)"
.section .note.GNU-stack,"",@progbits
Linux boiler.chaos.net 2.6.18 #1 PREEMPT Sat Oct 7 15:31:26 CDT 2006 i686 AMD
Athlon(tm) 64 Processor 3200+ AuthenticAMD GNU/Linux
GNU C Library stable release version 2.5, by Roland McGrath et al.
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 4.1.1 (Gentoo 4.1.1-r1).
Compiled on a Linux 2.6.17 system on 2006-10-30.
Available extensions:
The C stubs add-on version 2.1.2.
crypt add-on version 2.1 by Michael Glad and others
Gentoo patchset 1.2
GNU Libidn by Simon Josefsson
GNU libio by Per Bothner
NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk
Native POSIX Threads Library by Ulrich Drepper et al
Support for some architectures added on, not maintained in glibc core.
BIND-8.2.3-T5B
Thread-local storage support included.
For bug reporting instructions, please see:
<http://www.gnu.org/software/libc/bugs.html>.
-Neill.
(IRC: __sempai)
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