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arm64: insn: Add BUILD_BUG_ON() for invalid masks

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Detect invalid instruction masks at build time. Some versions of GCC can
warn about the situation, but not all of them, it seems.

Suggested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Jean-Philippe Brucker 2019-05-24 13:52:20 +01:00 committed by Will Deacon
parent c5e2edeb01
commit edbcf50eb8
1 changed files with 11 additions and 5 deletions
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10
arch/arm64/include/asm/insn.h
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@ -18,6 +18,7 @@
*/ */
#ifndef __ASM_INSN_H #ifndef __ASM_INSN_H
#define __ASM_INSN_H #define __ASM_INSN_H
#include <linux/build_bug.h>
#include <linux/types.h> #include <linux/types.h>
/* A64 instructions are always 32 bits. */ /* A64 instructions are always 32 bits. */
@ -268,9 +269,14 @@ enum aarch64_insn_adr_type {
#define __AARCH64_INSN_FUNCS(abbr, mask, val) \ #define __AARCH64_INSN_FUNCS(abbr, mask, val) \
static __always_inline bool aarch64_insn_is_##abbr(u32 code) \ static __always_inline bool aarch64_insn_is_##abbr(u32 code) \
{ return (code & (mask)) == (val); } \ { \
BUILD_BUG_ON(~(mask) & (val)); \
return (code & (mask)) == (val); \
} \
static __always_inline u32 aarch64_insn_get_##abbr##_value(void) \ static __always_inline u32 aarch64_insn_get_##abbr##_value(void) \
{ return (val); } { \
return (val); \
}
__AARCH64_INSN_FUNCS(adr, 0x9F000000, 0x10000000) __AARCH64_INSN_FUNCS(adr, 0x9F000000, 0x10000000)
__AARCH64_INSN_FUNCS(adrp, 0x9F000000, 0x90000000) __AARCH64_INSN_FUNCS(adrp, 0x9F000000, 0x90000000)