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linux-next/arch/x86/boot/code16gcc.h
H. Peter Anvin a9cfccee66 x86, build: Change code16gcc.h from a C header to an assembly header
By changing code16gcc.h from a C header to an assembly header and use
the -Wa,... option to gcc to force it to be added to the assembly
input, we can avoid the problems with gcc reordering code bits on us.

If we have -m16, we still use it, of course.

Suggested-by: Kevin O'Connor <kevin@koconnor.net>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/n/tip-xw8ibgdemucl9fz3i1bymu6w@git.kernel.org
2014-06-04 13:16:48 -07:00

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C

#
# code16gcc.h
#
# This file is added to the assembler via -Wa when compiling 16-bit C code.
# This is done this way instead via asm() to make sure gcc does not reorder
# things around us.
#
# gcc 4.9+ has a real -m16 option so we can drop this hack long term.
#
.code16gcc