From: Richard Henderson <richard.henderson@linaro.org>
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/6] arm64: Add asm/ccset.h header
Date: Wed, 11 Mar 2020 11:04:11 -0700 [thread overview]
Message-ID: <20200311180416.6509-2-richard.henderson@linaro.org> (raw)
In-Reply-To: <20200311180416.6509-1-richard.henderson@linaro.org>
With gcc 10, arm64 includes support for flag outputs, much like
x86 has done for years. Mirror the macros that x86 places in
asm/asm.h, with the necessary addition of CC_CLOBBER.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
arch/arm64/include/asm/ccset.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
create mode 100644 arch/arm64/include/asm/ccset.h
diff --git a/arch/arm64/include/asm/ccset.h b/arch/arm64/include/asm/ccset.h
new file mode 100644
index 000000000000..e733d383f515
--- /dev/null
+++ b/arch/arm64/include/asm/ccset.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_CCSET_H
+#define __ASM_CCSET_H
+
+/*
+ * Macros to generate condition code outputs from inline assembly.
+ * The output operand must be integral but type "bool" preferred.
+ */
+#ifdef __GCC_ASM_FLAG_OUTPUTS__
+# define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
+# define CC_OUT(c) "=@cc" #c
+# define CC_CLOBBER
+#else
+# define CC_SET(c) "\n\tcset %[_cc_" #c "], " #c "\n"
+# define CC_OUT(c) [_cc_ ## c] "=r"
+# define CC_CLOBBER "cc"
+#endif
+
+#endif /* __ASM_CCSET_H */
--
2.20.1
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next prev parent reply other threads:[~2020-03-11 18:04 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 18:04 [PATCH 0/6] arm64: gcc asm flag outputs Richard Henderson
2020-03-11 18:04 ` Richard Henderson [this message]
2020-03-13 10:54 ` [PATCH 1/6] arm64: Add asm/ccset.h header Mark Rutland
2020-03-13 16:29 ` Richard Henderson
2020-03-11 18:04 ` [PATCH 2/6] arm64: uaccess: Use named asm operands for __in_range Richard Henderson
2020-03-11 19:08 ` Robin Murphy
2020-03-11 21:48 ` Richard Henderson
2020-03-13 16:14 ` Robin Murphy
2020-03-11 18:04 ` [PATCH 3/6] arm64: uaccess: Untie the input address in __range_ok Richard Henderson
2020-03-11 19:08 ` Robin Murphy
2020-03-11 18:04 ` [PATCH 4/6] arm64: uaccess: Use asm/ccset.h macros " Richard Henderson
2020-03-12 11:48 ` Robin Murphy
2020-03-13 11:04 ` Mark Rutland
2020-03-13 16:51 ` Robin Murphy
2020-03-13 17:14 ` Mark Rutland
2020-03-11 18:04 ` [PATCH 5/6] arm64: archrandom: Use asm/ccset.h macros in __arm64_rndr Richard Henderson
2020-03-11 18:04 ` [PATCH 6/6] arm64: Hoist CONFIG option out of ALTERNATIVE in uaccess.h Richard Henderson
2020-03-13 10:46 ` Mark Rutland
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