diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 8109446f7b24..0270c9046f6b 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -52,6 +52,13 @@ config KASAN_SHADOW_OFFSET depends on KASAN default 0x1C000000000000 +config GCC_ASM_FLAG_OUTPUT_BROKEN + def_bool CC_IS_GCC && GCC_VERSION < 140200 + help + GCC versions before 14.2.0 may die with an internal + compiler error in some configurations if flag output + operands are used within inline assemblies. + config S390 def_bool y # diff --git a/arch/s390/include/asm/asm.h b/arch/s390/include/asm/asm.h index bea9dcf9e70e..ec011b94af2a 100644 --- a/arch/s390/include/asm/asm.h +++ b/arch/s390/include/asm/asm.h @@ -2,11 +2,50 @@ #ifndef _ASM_S390_ASM_H #define _ASM_S390_ASM_H -/* GCC versions before 14.2.0 may die with an ICE in some configurations. */ -#if defined(__GCC_ASM_FLAG_OUTPUTS__) && !(IS_ENABLED(CONFIG_CC_IS_GCC) && (GCC_VERSION < 140200)) +#include + +/* + * Helper macros to be used for flag output operand handling. + * Inline assemblies must use four of the five supplied macros: + * + * Use CC_IPM(sym) at the end of the inline assembly; this extracts the + * condition code and program mask with the ipm instruction and writes it to + * the variable with symbolic name [sym] if the compiler has no support for + * flag output operands. If the compiler has support for flag output operands + * this generates no code. + * + * Use CC_OUT(sym, var) at the output operand list of an inline assembly. This + * defines an output operand with symbolic name [sym] for the variable + * [var]. [var] must be an int variable and [sym] must be identical with [sym] + * used with CC_IPM(). + * + * Use either CC_CLOBBER or CC_CLOBBER_LIST() for the clobber list. Use + * CC_CLOBBER if the clobber list contains only "cc", otherwise use + * CC_CLOBBER_LIST() and add all clobbers as argument to the macro. + * + * Use CC_TRANSFORM() to convert the variable [var] which contains the + * extracted condition code. If the condition code is extracted with ipm, the + * [var] also contains the program mask. CC_TRANSFORM() moves the condition + * code to the two least significant bits and sets all other bits to zero. + */ +#if defined(__GCC_ASM_FLAG_OUTPUTS__) && !(IS_ENABLED(CONFIG_GCC_ASM_FLAG_OUTPUT_BROKEN)) #define __HAVE_ASM_FLAG_OUTPUTS__ +#define CC_IPM(sym) +#define CC_OUT(sym, var) "=@cc" (var) +#define CC_TRANSFORM(cc) ({ cc; }) +#define CC_CLOBBER +#define CC_CLOBBER_LIST(...) __VA_ARGS__ + +#else + +#define CC_IPM(sym) " ipm %[" __stringify(sym) "]\n" +#define CC_OUT(sym, var) [sym] "=d" (var) +#define CC_TRANSFORM(cc) ({ (cc) >> 28; }) +#define CC_CLOBBER "cc" +#define CC_CLOBBER_LIST(...) "cc", __VA_ARGS__ + #endif #endif /* _ASM_S390_ASM_H */