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e9666d10a5
Currently, CONFIG_JUMP_LABEL just means "I _want_ to use jump label". The jump label is controlled by HAVE_JUMP_LABEL, which is defined like this: #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL) # define HAVE_JUMP_LABEL #endif We can improve this by testing 'asm goto' support in Kconfig, then make JUMP_LABEL depend on CC_HAS_ASM_GOTO. Ugly #ifdef HAVE_JUMP_LABEL will go away, and CONFIG_JUMP_LABEL will match to the real kernel capability. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_RMWcc
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#define _ASM_X86_RMWcc
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/* This counts to 12. Any more, it will return 13th argument. */
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#define __RMWcc_ARGS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _n, X...) _n
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#define RMWcc_ARGS(X...) __RMWcc_ARGS(, ##X, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
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#define __RMWcc_CONCAT(a, b) a ## b
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#define RMWcc_CONCAT(a, b) __RMWcc_CONCAT(a, b)
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#define __CLOBBERS_MEM(clb...) "memory", ## clb
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#if !defined(__GCC_ASM_FLAG_OUTPUTS__) && defined(CONFIG_CC_HAS_ASM_GOTO)
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/* Use asm goto */
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#define __GEN_RMWcc(fullop, _var, cc, clobbers, ...) \
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({ \
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bool c = false; \
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asm_volatile_goto (fullop "; j" #cc " %l[cc_label]" \
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: : [var] "m" (_var), ## __VA_ARGS__ \
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: clobbers : cc_label); \
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if (0) { \
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cc_label: c = true; \
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} \
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c; \
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})
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#else /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CONFIG_CC_HAS_ASM_GOTO) */
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/* Use flags output or a set instruction */
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#define __GEN_RMWcc(fullop, _var, cc, clobbers, ...) \
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({ \
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bool c; \
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asm volatile (fullop CC_SET(cc) \
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: [var] "+m" (_var), CC_OUT(cc) (c) \
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: __VA_ARGS__ : clobbers); \
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c; \
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})
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#endif /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CONFIG_CC_HAS_ASM_GOTO) */
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#define GEN_UNARY_RMWcc_4(op, var, cc, arg0) \
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__GEN_RMWcc(op " " arg0, var, cc, __CLOBBERS_MEM())
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#define GEN_UNARY_RMWcc_3(op, var, cc) \
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GEN_UNARY_RMWcc_4(op, var, cc, "%[var]")
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#define GEN_UNARY_RMWcc(X...) RMWcc_CONCAT(GEN_UNARY_RMWcc_, RMWcc_ARGS(X))(X)
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#define GEN_BINARY_RMWcc_6(op, var, cc, vcon, _val, arg0) \
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__GEN_RMWcc(op " %[val], " arg0, var, cc, \
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__CLOBBERS_MEM(), [val] vcon (_val))
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#define GEN_BINARY_RMWcc_5(op, var, cc, vcon, val) \
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GEN_BINARY_RMWcc_6(op, var, cc, vcon, val, "%[var]")
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#define GEN_BINARY_RMWcc(X...) RMWcc_CONCAT(GEN_BINARY_RMWcc_, RMWcc_ARGS(X))(X)
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#define GEN_UNARY_SUFFIXED_RMWcc(op, suffix, var, cc, clobbers...) \
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__GEN_RMWcc(op " %[var]\n\t" suffix, var, cc, \
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__CLOBBERS_MEM(clobbers))
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#define GEN_BINARY_SUFFIXED_RMWcc(op, suffix, var, cc, vcon, _val, clobbers...)\
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__GEN_RMWcc(op " %[val], %[var]\n\t" suffix, var, cc, \
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__CLOBBERS_MEM(clobbers), [val] vcon (_val))
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#endif /* _ASM_X86_RMWcc */
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