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https://dev.openwrt.org/browser/trunk/toolchain/uClibc/patches-0.9.30.1/901-hi_lo_system_calls.patch
[toolchain] Do not save variables in hi or lo across system calls, fixes issues with gcc-4.4 (#5351)
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>

--- ./libc/sysdeps/linux/mips/bits/syscalls.h.orig
+++ ./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