Hi Matthias, 2017-04-04 6:25 GMT+09:00 Matthias Kaehlcke <mka@xxxxxxxxxxxx>: > When using clang with -no-integerated-as clang will use the gnu > assembler instead of the integrated assembler. However clang will > still perform asm error checking before sending the inline assembly > language to gas. > > The generation of asm-offsets from within C code is dependent on gcc's > blind passing of whatever is in asm() through to gas. Arbirary text is > passed through which is then modified by a sed script into the > appropriate .h and .S code. Since the arbitrary text is not valid > assembly language, clang fails. > > This can be fixed by making the arbitrary text into an ASM comment and > then updating the sed scripts accordingly to work as expected. > > This solution works for both gcc and clang. > > Based-on-patch-from: Behan Webster <behanw@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx> Could you check Jeroen Hofstee's work for U-Boot? http://patchwork.ozlabs.org/patch/375026/ His idea is to use .ascii string in order to handle this in arch-agnostic way. If you are happy about this idea, I can forward his patch (with a little bit adjustment). We may want to refactor the patch because the double mark ".ascii" and "->" seem redundant, but it is just a detail. Masahiro > Dependencies > all architectures > kbuild: Consolidate header generation from ASM offset information > https://patchwork.kernel.org/patch/9660459/ > > um > um: Include kbuild.h instead of duplicating its macros > https://patchwork.kernel.org/patch/9660503/ > > frv > frv: Use OFFSET macro in DEF_*REG() > https://patchwork.kernel.org/patch/9660473/ > > The change has been build tested on a wide range of architectures. > > The if cascade in kbuild.h and the comment symbol list in > Makefile.asm-offsets won't win a beauty price. Alternatively the comment > symbol could be specified in arch/Kconfig. Personally I don't have a > strong preference on this point. > > include/linux/kbuild.h | 34 ++++++++++++++++++++++++++++--- > scripts/Makefile.asm-offsets | 48 ++++++++++++++++++++++++++++++++++++++++---- > 2 files changed, 75 insertions(+), 7 deletions(-) > > diff --git a/include/linux/kbuild.h b/include/linux/kbuild.h > index 22a72198c14b..632e33d3b70c 100644 > --- a/include/linux/kbuild.h > +++ b/include/linux/kbuild.h > @@ -1,15 +1,43 @@ > #ifndef __LINUX_KBUILD_H > #define __LINUX_KBUILD_H > > +#if defined(CONFIG_ALPHA) || defined(CONFIG_AVR32) || \ > + defined(CONFIG_MICROBLAZE) || defined(CONFIG_MIPS) || \ > + defined(CONFIG_MN10300) || defined(CONFIG_PPC) || \ > + defined(CONFIG_S390) || defined(CONFIG_SCORE) || \ > + defined(CONFIG_UML_X86) || defined(CONFIG_X86) || \ > + defined(CONFIG_XTENSA) > +#define ASM_COMMENT_SYM "#" > +#elif defined(CONFIG_ARM) || defined(CONFIG_ARM64) > +#define ASM_COMMENT_SYM "@" > +#elif defined(CONFIG_ARC) || defined(CONFIG_C6X) || \ > + defined(CONFIG_CRIS) || defined(CONFIG_FRV) || \ > + defined(CONFIG_H8300) || defined(CONFIG_M32R) || \ > + defined(CONFIG_PARISC) > +#define ASM_COMMENT_SYM ";" > +#elif defined(CONFIG_BLACKFIN) || defined(CONFIG_HEXAGON) || \ > + defined(CONFIG_IA64) || defined(CONFIG_NIOS2) || \ > + defined(CONFIG_OPENRISC) > +#define ASM_COMMENT_SYM "//" > +#elif defined(CONFIG_METAG) || defined(CONFIG_SUPERH) || \ > + defined(CONFIG_SPARC) || defined(CONFIG_TILE) || \ > + defined(CONFIG_UNICORE32) > +#define ASM_COMMENT_SYM "!" > +#elif defined(CONFIG_M68K) > +#define ASM_COMMENT_SYM "|" > +#else > +#error Symbol for ASM inline comments is not defined for ARCH > +#endif > + > #define DEFINE(sym, val) \ > - asm volatile("\n->" #sym " %0 " #val : : "i" (val)) > + asm volatile("\n" ASM_COMMENT_SYM "->" #sym " %0 " #val : : "i" (val)) > > -#define BLANK() asm volatile("\n->" : : ) > +#define BLANK() asm volatile("\n" ASM_COMMENT_SYM "->" : : ) > > #define OFFSET(sym, str, mem) \ > DEFINE(sym, offsetof(struct str, mem)) > > #define COMMENT(x) \ > - asm volatile("\n->#" x) > + asm volatile("\n" ASM_COMMENT_SYM "->#" x) > > #endif > diff --git a/scripts/Makefile.asm-offsets b/scripts/Makefile.asm-offsets > index 4ba80ba29b82..7f8d3cbc5901 100644 > --- a/scripts/Makefile.asm-offsets > +++ b/scripts/Makefile.asm-offsets > @@ -1,9 +1,49 @@ > +# Symbols for ASM inline comments for all architectures > +asm_comment_sym_arch_alpha = \# > +asm_comment_sym_arch_arc = \; > +asm_comment_sym_arch_arm = @ > +asm_comment_sym_arch_arm64 = @ > +asm_comment_sym_arch_avr32 = \# > +asm_comment_sym_arch_blackfin = // > +asm_comment_sym_arch_c6x = \; > +asm_comment_sym_arch_cris = \; > +asm_comment_sym_arch_frv = \; > +asm_comment_sym_arch_h8300 = \; > +asm_comment_sym_arch_hexagon = // > +asm_comment_sym_arch_ia64 = // > +asm_comment_sym_arch_m32r = \; > +asm_comment_sym_arch_m68k = | > +asm_comment_sym_arch_metag = ! > +asm_comment_sym_arch_microblaze = \# > +asm_comment_sym_arch_mips = \# > +asm_comment_sym_arch_mn10300 = \# > +asm_comment_sym_arch_nios2 = // > +asm_comment_sym_arch_openrisc = // > +asm_comment_sym_arch_parisc = \; > +asm_comment_sym_arch_powerpc = \# > +asm_comment_sym_arch_s390 = \# > +asm_comment_sym_arch_score = \# > +asm_comment_sym_arch_sh = ! > +asm_comment_sym_arch_sparc = ! > +asm_comment_sym_arch_tile = ! > +# Note: assumes uml_x86 > +asm_comment_sym_arch_um = \# > +asm_comment_sym_arch_unicore32 = ! > +asm_comment_sym_arch_x86 = \# > +asm_comment_sym_arch_xtensa = \# > + > +ASM_COMMENT_SYM = $(asm_comment_sym_arch_$(SRCARCH)) > + > +ifeq ($(ASM_COMMENT_SYM),) > +$(error Symbol for ASM inline comments is not defined for ARCH=$(SRCARCH)) > +endif > + > # Default sed regexp - multiline due to syntax constraints > define sed-asm-offsets-to-c > - "/^->/{s:->#\(.*\):/* \1 */:; \ > - s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \ > - s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ > - s:->::; p;}" > + "\:^$(ASM_COMMENT_SYM)->:{s:$(ASM_COMMENT_SYM)->#\(.*\):/* \1 */:; \ > + s:^$(ASM_COMMENT_SYM)->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \ > + s:^$(ASM_COMMENT_SYM)->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ > + s:$(ASM_COMMENT_SYM)->::; p;}" > endef > > define gen_header_from_asm_offsets > -- -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
