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GCC has supported asm goto since 4.5, and Clang has since version 9.0.0. The minimum supported versions of these tools for the build according to Documentation/process/changes.rst are 5.1 and 11.0.0 respectively. Remove the feature detection script, Kconfig option, and clean up some fallback code that is no longer supported. The removed script was also testing for a GCC specific bug that was fixed in the 4.7 release. Also remove workarounds for bpftrace using clang older than 9.0.0, since other BPF backend fixes are required at this point. Link: https://lore.kernel.org/lkml/CAK7LNATSr=BXKfkdW8f-H5VT_w=xBpT2ZQcZ7rm6JfkdE+QnmA@mail.gmail.com/ Link: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48637 Acked-by: Borislav Petkov <bp@suse.de> Suggested-by: Masahiro Yamada <masahiroy@kernel.org> Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
71 lines
2.1 KiB
C
71 lines
2.1 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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#ifndef __GCC_ASM_FLAG_OUTPUTS__
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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__) */
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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__) */
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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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