52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_S390_ASM_H
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#define _ASM_S390_ASM_H
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#include <linux/stringify.h>
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/*
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* Helper macros to be used for flag output operand handling.
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* Inline assemblies must use four of the five supplied macros:
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*
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* Use CC_IPM(sym) at the end of the inline assembly; this extracts the
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* condition code and program mask with the ipm instruction and writes it to
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* the variable with symbolic name [sym] if the compiler has no support for
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* flag output operands. If the compiler has support for flag output operands
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* this generates no code.
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*
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* Use CC_OUT(sym, var) at the output operand list of an inline assembly. This
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* defines an output operand with symbolic name [sym] for the variable
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* [var]. [var] must be an int variable and [sym] must be identical with [sym]
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* used with CC_IPM().
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*
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* Use either CC_CLOBBER or CC_CLOBBER_LIST() for the clobber list. Use
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* CC_CLOBBER if the clobber list contains only "cc", otherwise use
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* CC_CLOBBER_LIST() and add all clobbers as argument to the macro.
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*
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* Use CC_TRANSFORM() to convert the variable [var] which contains the
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* extracted condition code. If the condition code is extracted with ipm, the
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* [var] also contains the program mask. CC_TRANSFORM() moves the condition
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* code to the two least significant bits and sets all other bits to zero.
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*/
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#if defined(__GCC_ASM_FLAG_OUTPUTS__) && !(IS_ENABLED(CONFIG_GCC_ASM_FLAG_OUTPUT_BROKEN))
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#define __HAVE_ASM_FLAG_OUTPUTS__
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#define CC_IPM(sym)
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#define CC_OUT(sym, var) "=@cc" (var)
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#define CC_TRANSFORM(cc) ({ cc; })
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#define CC_CLOBBER
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#define CC_CLOBBER_LIST(...) __VA_ARGS__
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#else
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#define CC_IPM(sym) " ipm %[" __stringify(sym) "]\n"
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#define CC_OUT(sym, var) [sym] "=d" (var)
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#define CC_TRANSFORM(cc) ({ (cc) >> 28; })
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#define CC_CLOBBER "cc"
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#define CC_CLOBBER_LIST(...) "cc", __VA_ARGS__
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#endif
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#endif /* _ASM_S390_ASM_H */
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