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/* 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_CC_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 */
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