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| author | Punit Agrawal <punit.agrawal@arm.com> | 2014-11-18 11:41:25 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2014-11-20 16:34:31 +0000 |
| commit | bd35a4adc4131c530ec7d90242555eac7b3dbe3f (patch) | |
| tree | 61db668ee8924e5dae4aa53fadf8b8ffde6bba3b /arch/arm64/include/asm/insn.h | |
| parent | 587064b610c703f259317d00dc37bf6d40f4fc74 (diff) | |
| download | linux-bd35a4adc4131c530ec7d90242555eac7b3dbe3f.tar.bz2 | |
arm64: Port SWP/SWPB emulation support from arm
The SWP instruction was deprecated in the ARMv6 architecture. The
ARMv7 multiprocessing extensions mandate that SWP/SWPB instructions
are treated as undefined from reset, with the ability to enable them
through the System Control Register SW bit. With ARMv8, the option to
enable these instructions through System Control Register was dropped
as well.
To support legacy applications using these instructions, port the
emulation of the SWP and SWPB instructions from the arm port to arm64.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/insn.h')
| -rw-r--r-- | arch/arm64/include/asm/insn.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h index 1bb043018315..3ecc57c47c04 100644 --- a/arch/arm64/include/asm/insn.h +++ b/arch/arm64/include/asm/insn.h @@ -356,6 +356,12 @@ int aarch64_insn_patch_text_sync(void *addrs[], u32 insns[], int cnt); int aarch64_insn_patch_text(void *addrs[], u32 insns[], int cnt); bool aarch32_insn_is_wide(u32 insn); + +#define A32_RN_OFFSET 16 +#define A32_RT_OFFSET 12 +#define A32_RT2_OFFSET 0 + +u32 aarch32_insn_extract_reg_num(u32 insn, int offset); #endif /* __ASSEMBLY__ */ #endif /* __ASM_INSN_H */ |