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powerpc: Use a datatype for instructions

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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
This commit is contained in:
Jordan Niethe
2020-05-06 13:40:31 +10:00
committed by Michael Ellerman
parent 217862d9b9
commit 94afd069d9
26 changed files with 237 additions and 214 deletions
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18
arch/powerpc/include/asm/inst.h
View File

@@ -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 */