linux/arch/x86/boot/code16gcc.h

#
# 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
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 20:16:48 +00:00			`#`
			`# 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.`
			`#`
Header file to produce 16-bit code with gcc gcc for i386 can be used with the assembly prefix ".code16gcc" to generate 16-bit (real-mode) code. This header file provides the assembly prefix. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 2007-07-11 19:18:38 +00:00
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 20:16:48 +00:00			`.code16gcc`