/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_S390_ASM_H #define _ASM_S390_ASM_H #include <linux/stringify.h> /* * 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 */