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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef _ASM_S390_ASM_H |
| 3 | #define _ASM_S390_ASM_H |
| 4 | |
| 5 | #include <linux/stringify.h> |
| 6 | |
| 7 | /* |
| 8 | * Helper macros to be used for flag output operand handling. |
| 9 | * Inline assemblies must use four of the five supplied macros: |
| 10 | * |
| 11 | * Use CC_IPM(sym) at the end of the inline assembly; this extracts the |
| 12 | * condition code and program mask with the ipm instruction and writes it to |
| 13 | * the variable with symbolic name [sym] if the compiler has no support for |
| 14 | * flag output operands. If the compiler has support for flag output operands |
| 15 | * this generates no code. |
| 16 | * |
| 17 | * Use CC_OUT(sym, var) at the output operand list of an inline assembly. This |
| 18 | * defines an output operand with symbolic name [sym] for the variable |
| 19 | * [var]. [var] must be an int variable and [sym] must be identical with [sym] |
| 20 | * used with CC_IPM(). |
| 21 | * |
| 22 | * Use either CC_CLOBBER or CC_CLOBBER_LIST() for the clobber list. Use |
| 23 | * CC_CLOBBER if the clobber list contains only "cc", otherwise use |
| 24 | * CC_CLOBBER_LIST() and add all clobbers as argument to the macro. |
| 25 | * |
| 26 | * Use CC_TRANSFORM() to convert the variable [var] which contains the |
| 27 | * extracted condition code. If the condition code is extracted with ipm, the |
| 28 | * [var] also contains the program mask. CC_TRANSFORM() moves the condition |
| 29 | * code to the two least significant bits and sets all other bits to zero. |
| 30 | */ |
| 31 | #if defined(__GCC_ASM_FLAG_OUTPUTS__) && !(IS_ENABLED(CONFIG_CC_ASM_FLAG_OUTPUT_BROKEN)) |
| 32 | |
| 33 | #define __HAVE_ASM_FLAG_OUTPUTS__ |
| 34 | |
| 35 | #define CC_IPM(sym) |
| 36 | #define CC_OUT(sym, var) "=@cc" (var) |
| 37 | #define CC_TRANSFORM(cc) ({ cc; }) |
| 38 | #define CC_CLOBBER |
| 39 | #define CC_CLOBBER_LIST(...) __VA_ARGS__ |
| 40 | |
| 41 | #else |
| 42 | |
| 43 | #define CC_IPM(sym) " ipm %[" __stringify(sym) "]\n" |
| 44 | #define CC_OUT(sym, var) [sym] "=d" (var) |
| 45 | #define CC_TRANSFORM(cc) ({ (cc) >> 28; }) |
| 46 | #define CC_CLOBBER "cc" |
| 47 | #define CC_CLOBBER_LIST(...) "cc", __VA_ARGS__ |
| 48 | |
| 49 | #endif |
| 50 | |
| 51 | #endif /* _ASM_S390_ASM_H */ |
| 52 |
Warning: This file is not a C or C++ file. It does not have highlighting.