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650b55b707
For powerpc64, redefine the ppc_inst type so both word and prefixed
instructions can be represented. On powerpc32 the type will remain the
same. Update places which had assumed instructions to be 4 bytes long.
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Reviewed-by: Alistair Popple <alistair@popple.id.au>
[mpe: Rework the get_user_inst() macros to be parameterised, and don't
assign to the dest if an error occurred. Use CONFIG_PPC64 not
__powerpc64__ in a few places. Address other comments from
Christophe. Fix some sparse complaints.]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-24-jniethe5@gmail.com
109 lines
2.1 KiB
C
109 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _ASM_POWERPC_INST_H
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#define _ASM_POWERPC_INST_H
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#include <asm/ppc-opcode.h>
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/*
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* Instruction data type for POWER
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*/
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struct ppc_inst {
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u32 val;
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#ifdef CONFIG_PPC64
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u32 suffix;
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#endif
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} __packed;
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static inline u32 ppc_inst_val(struct ppc_inst x)
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{
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return x.val;
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}
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static inline int ppc_inst_primary_opcode(struct ppc_inst x)
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{
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return ppc_inst_val(x) >> 26;
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}
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#ifdef CONFIG_PPC64
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#define ppc_inst(x) ((struct ppc_inst){ .val = (x), .suffix = 0xff })
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#define ppc_inst_prefix(x, y) ((struct ppc_inst){ .val = (x), .suffix = (y) })
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static inline u32 ppc_inst_suffix(struct ppc_inst x)
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{
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return x.suffix;
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}
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static inline bool ppc_inst_prefixed(struct ppc_inst x)
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{
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return (ppc_inst_primary_opcode(x) == 1) && ppc_inst_suffix(x) != 0xff;
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}
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static inline struct ppc_inst ppc_inst_swab(struct ppc_inst x)
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{
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return ppc_inst_prefix(swab32(ppc_inst_val(x)),
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swab32(ppc_inst_suffix(x)));
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}
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static inline struct ppc_inst ppc_inst_read(const struct ppc_inst *ptr)
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{
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u32 val, suffix;
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val = *(u32 *)ptr;
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if ((val >> 26) == OP_PREFIX) {
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suffix = *((u32 *)ptr + 1);
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return ppc_inst_prefix(val, suffix);
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} else {
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return ppc_inst(val);
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}
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}
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static inline bool ppc_inst_equal(struct ppc_inst x, struct ppc_inst y)
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{
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return *(u64 *)&x == *(u64 *)&y;
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}
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#else
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#define ppc_inst(x) ((struct ppc_inst){ .val = x })
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static inline bool ppc_inst_prefixed(struct ppc_inst x)
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{
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return false;
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}
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static inline u32 ppc_inst_suffix(struct ppc_inst x)
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{
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return 0;
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}
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static inline struct ppc_inst ppc_inst_swab(struct ppc_inst x)
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{
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return ppc_inst(swab32(ppc_inst_val(x)));
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}
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static inline struct ppc_inst ppc_inst_read(const struct ppc_inst *ptr)
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{
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return *ptr;
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}
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static inline bool ppc_inst_equal(struct ppc_inst x, struct ppc_inst y)
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{
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return ppc_inst_val(x) == ppc_inst_val(y);
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}
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#endif /* CONFIG_PPC64 */
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static inline int ppc_inst_len(struct ppc_inst x)
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{
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return ppc_inst_prefixed(x) ? 8 : 4;
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}
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int probe_user_read_inst(struct ppc_inst *inst,
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struct ppc_inst __user *nip);
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int probe_kernel_read_inst(struct ppc_inst *inst,
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struct ppc_inst *src);
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#endif /* _ASM_POWERPC_INST_H */
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