[uclibc-ng-devel] uClibc-ng - small C library for embedded systems branch master updated. 4f0f1d754ff5e1e7076ebf2bf02b18fc357bc51c

This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "uClibc-ng - small C library for embedded systems". The branch, master has been updated via 4f0f1d754ff5e1e7076ebf2bf02b18fc357bc51c (commit) from bb7d04b2ba168a051d288ee82c24faf68a433ed2 (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- commit 4f0f1d754ff5e1e7076ebf2bf02b18fc357bc51c Author: mirabilos <tg(a)mirbsd.org> Date: Sat Jul 25 18:51:26 2015 +0200 fix inline asm changing the stack pointer leading to segfaults problem ----------------------------------------------------------------------- Summary of changes: libc/sysdeps/linux/i386/brk.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/libc/sysdeps/linux/i386/brk.c b/libc/sysdeps/linux/i386/brk.c index c2c9327..a513886 100644 --- a/libc/sysdeps/linux/i386/brk.c +++ b/libc/sysdeps/linux/i386/brk.c @@ -1,6 +1,7 @@ /* brk system call for Linux/i386. Copyright (C) 1995, 1996, 2000 Free Software Foundation, Inc. - This file is part of the GNU C Library. + Copyright (c) 2015 mirabilos <tg(a)mirbsd.org> + This file is part of uclibc-ng, derived from the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public @@ -27,15 +28,18 @@ int brk(void *addr) { void *newbrk; - /* %ebx is used in PIC code, need to save/restore it manually. - * gcc won't do it for us if we will request it in constraints + /* + * EBC is used in PIC code, we need to save/restore it manually. + * Unfortunately, GCC won't do that for us even if we use con- + * straints, and we cannot push it either as ESP clobbers are + * silently ignored, but EDX is preserved, so it's scratch space. */ - __asm__("pushl %%ebx\n" - "movl %2, %%ebx\n" - "int $0x80\n" - "popl %%ebx\n" + __asm__("xchgl %%edx,%%ebx" + "\n int $0x80" + "\n xchgl %%edx,%%ebx" : "=a" (newbrk) - : "0" (__NR_brk), "g" (addr) + : "0" (__NR_brk), "d" (addr) + : "cc" ); __curbrk = newbrk; hooks/post-receive -- uClibc-ng - small C library for embedded systems