Author: ian
Date: Fri Jan 2 03:20:13 2015
New Revision: 276525
URL: https://svnweb.freebsd.org/changeset/base/276525
Log:
Put in a workaround for bug 196407 (arm modules cause crashes & panics).
When we started compiling the kernel with -march=armv7 the compiler
started emitting new types of relocation info which are incompatible with
the shared-lib file format used by .ko modules. This workaround prevents
the compiler from emitting the instruction sequences that require the
new relocs. This amounts to using an undocumented internal compiler
flag, so this is just a temporary workaround while we look for a good fix.
PR: 196407
Modified:
head/sys/conf/kmod.mk
Modified: head/sys/conf/kmod.mk
==============================================================================
--- head/sys/conf/kmod.mk Fri Jan 2 02:47:47 2015 (r276524)
+++ head/sys/conf/kmod.mk Fri Jan 2 03:20:13 2015 (r276525)
@@ -118,6 +118,11 @@ CFLAGS+= ${DEBUG_FLAGS}
CFLAGS+= -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer
.endif
+# Temporary workaround for PR 196407, which contains the fascinating details.
+.if ${MACHINE_CPUARCH} == arm
+CFLAGS.clang+= -mllvm -arm-use-movt=0
+.endif
+
.if ${MACHINE_CPUARCH} == powerpc
CFLAGS+= -mlongcall -fno-omit-frame-pointer
.endif
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