From: Florian Fainelli <florian@openwrt.org>
Date: Sat, 26 Sep 2009 18:08:02 +0000 (+0000)
Subject: Do not save variables in hi or lo across system calls, fixes issues with gcc-4.4... 
X-Git-Tag: reboot~22363
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=9e1759bfe68e33618bec459677e1d2ab45a3eb76;p=oweals%2Fopenwrt.git

Do not save variables in hi or lo across system calls, fixes issues with gcc-4.4 (#5351)

SVN-Revision: 17742
---

diff --git a/toolchain/uClibc/patches-0.9.30.1/901-hi_lo_system_calls.patch b/toolchain/uClibc/patches-0.9.30.1/901-hi_lo_system_calls.patch
new file mode 100644
index 0000000000..6c78130e3f
--- /dev/null
+++ b/toolchain/uClibc/patches-0.9.30.1/901-hi_lo_system_calls.patch
@@ -0,0 +1,30 @@
+The kernel does not save these registers across system calls.  GCC 4.4
+has gotten more agressive about using them for temporary variables, so
+this shows up as intermittent crashes if you use a recent compiler.
+
+Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com>
+
+diff --git a/libc/sysdeps/linux/mips/bits/syscalls.h b/libc/sysdeps/linux/mips/bits/syscalls.h
+index 3639913..28b0f91 100644
+--- a/libc/sysdeps/linux/mips/bits/syscalls.h
++++ b/libc/sysdeps/linux/mips/bits/syscalls.h
+@@ -261,7 +261,7 @@
+ })
+ 
+ #define __SYSCALL_CLOBBERS "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", \
+-	"$14", "$15", "$24", "$25", "memory"
++	"$14", "$15", "$24", "$25", "hi", "lo", "memory"
+ 
+ #else /* N32 || N64 */
+ 
+@@ -318,7 +318,7 @@
+ })
+ 
+ #define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \
+-	"$14", "$15", "$24", "$25", "memory"
++	"$14", "$15", "$24", "$25", "hi", "lo", "memory"
+ 
+ #endif
+ 
+
+--