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| author | Jordan Niethe <jniethe5@gmail.com> | 2020-05-06 05:40:31 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-18 16:10:37 +0200 |
| commit | 94afd069d937d84fb4f696eb9a78db4084e43d21 (patch) | |
| tree | 88f3f2fef60d56cd3b155762c378ac1fc05a5bd2 /arch/powerpc/include/asm/inst.h | |
| parent | powerpc: Introduce functions for instruction equality (diff) | |
| download | linux-94afd069d937d84fb4f696eb9a78db4084e43d21.tar.xz linux-94afd069d937d84fb4f696eb9a78db4084e43d21.zip | |
powerpc: Use a datatype for instructions
Currently unsigned ints are used to represent instructions on powerpc.
This has worked well as instructions have always been 4 byte words.
However, ISA v3.1 introduces some changes to instructions that mean
this scheme will no longer work as well. This change is Prefixed
Instructions. A prefixed instruction is made up of a word prefix
followed by a word suffix to make an 8 byte double word instruction.
No matter the endianness of the system the prefix always comes first.
Prefixed instructions are only planned for powerpc64.
Introduce a ppc_inst type to represent both prefixed and word
instructions on powerpc64 while keeping it possible to exclusively
have word instructions on powerpc32.
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
[mpe: Fix compile error in emulate_spe()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-12-jniethe5@gmail.com
Diffstat (limited to 'arch/powerpc/include/asm/inst.h')
| -rw-r--r-- | arch/powerpc/include/asm/inst.h | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/arch/powerpc/include/asm/inst.h b/arch/powerpc/include/asm/inst.h index ff8d58671648..f602ca908936 100644 --- a/arch/powerpc/include/asm/inst.h +++ b/arch/powerpc/include/asm/inst.h @@ -6,26 +6,30 @@ * Instruction data type for POWER */ -#define ppc_inst(x) (x) +struct ppc_inst { + u32 val; +} __packed; -static inline u32 ppc_inst_val(u32 x) +#define ppc_inst(x) ((struct ppc_inst){ .val = x }) + +static inline u32 ppc_inst_val(struct ppc_inst x) { - return x; + return x.val; } -static inline int ppc_inst_primary_opcode(u32 x) +static inline int ppc_inst_primary_opcode(struct ppc_inst x) { return ppc_inst_val(x) >> 26; } -static inline u32 ppc_inst_swab(u32 x) +static inline struct ppc_inst ppc_inst_swab(struct ppc_inst x) { return ppc_inst(swab32(ppc_inst_val(x))); } -static inline bool ppc_inst_equal(u32 x, u32 y) +static inline bool ppc_inst_equal(struct ppc_inst x, struct ppc_inst y) { - return x == y; + return ppc_inst_val(x) == ppc_inst_val(y); } #endif /* _ASM_POWERPC_INST_H */ |