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16ef9767e4
The code patching code wants to get the value of a struct ppc_inst as
a u64 when the instruction is prefixed, so we can pass the u64 down to
__put_user_asm() and write it with a single store.
The optprobes code wants to load a struct ppc_inst as an immediate
into a register so it is useful to have it as a u64 to use the
existing helper function.
Currently this is a bit awkward because the value differs based on the
CPU endianness, so add a helper to do the conversion.
This fixes the usage in arch_prepare_optimized_kprobe() which was
previously incorrect on big endian.
Fixes: 650b55b707 ("powerpc: Add prefixed instructions to instruction data type")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Tested-by: Jordan Niethe <jniethe5@gmail.com>
Link: https://lore.kernel.org/r/20200526072630.2487363-1-mpe@ellerman.id.au
132 lines
2.6 KiB
C
132 lines
2.6 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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/*
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* Return the address of the next instruction, if the instruction @value was
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* located at @location.
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*/
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static inline struct ppc_inst *ppc_inst_next(void *location, struct ppc_inst *value)
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{
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struct ppc_inst tmp;
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tmp = ppc_inst_read(value);
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return location + ppc_inst_len(tmp);
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}
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static inline u64 ppc_inst_as_u64(struct ppc_inst x)
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{
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#ifdef CONFIG_CPU_LITTLE_ENDIAN
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return (u64)ppc_inst_suffix(x) << 32 | ppc_inst_val(x);
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#else
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return (u64)ppc_inst_val(x) << 32 | ppc_inst_suffix(x);
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#endif
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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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