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579a6633b8
Config options which can be used to check for compiler bugs and features have the compiler independent CC prefix in order to avoid duplicating and having to check config options for multiple compilers. Therefore rename the config option accordingly. Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
/* 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_CC_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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