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/* SPDX-License-Identifier: GPL-2.0-or-later */
* Copyright (C) 2004 Paul Mackerras <>, IBM
struct pt_regs;
* We don't allow single-stepping an mtmsrd that would clear
* MSR_RI, since that would make the exception unrecoverable.
* Since we need to single-step to proceed from a breakpoint,
* we don't allow putting a breakpoint on an mtmsrd instruction.
* Similarly we don't allow breakpoints on rfid instructions.
* These macros tell us if an instruction is a mtmsrd or rfid.
* Note that IS_MTMSRD returns true for both an mtmsr (32-bit)
* and an mtmsrd (64-bit).
#define IS_MTMSRD(instr) (((instr) & 0xfc0007be) == 0x7c000124)
#define IS_RFID(instr) (((instr) & 0xfc0007fe) == 0x4c000024)
#define IS_RFI(instr) (((instr) & 0xfc0007fe) == 0x4c000064)
enum instruction_type {
COMPUTE, /* arith/logical/CR op, etc. */
LOAD, /* load and store types need to be contiguous */
#define INSTR_TYPE_MASK 0x1f
#define OP_IS_LOAD_STORE(type) (LOAD <= (type) && (type) <= STCX)
/* Compute flags, ORed in with type */
#define SETREG 0x20
#define SETCC 0x40
#define SETXER 0x80
/* Branch flags, ORed in with type */
#define SETLK 0x20
#define BRTAKEN 0x40
#define DECCTR 0x80
/* Load/store flags, ORed in with type */
#define SIGNEXT 0x20
#define UPDATE 0x40 /* matches bit in opcode 31 instructions */
#define BYTEREV 0x80
#define FPCONV 0x100
/* Barrier type field, ORed in with type */
#define BARRIER_MASK 0xe0
#define BARRIER_SYNC 0x00
#define BARRIER_ISYNC 0x20
#define BARRIER_EIEIO 0x40
#define BARRIER_LWSYNC 0x60
#define BARRIER_PTESYNC 0x80
/* Cacheop values, ORed in with type */
#define CACHEOP_MASK 0x700
#define DCBST 0
#define DCBF 0x100
#define DCBTST 0x200
#define DCBT 0x300
#define ICBI 0x400
#define DCBZ 0x500
/* VSX flags values */
#define VSX_FPCONV 1 /* do floating point SP/DP conversion */
#define VSX_SPLAT 2 /* store loaded value into all elements */
#define VSX_LDLEFT 4 /* load VSX register from left */
#define VSX_CHECK_VEC 8 /* check MSR_VEC not MSR_VSX for reg >= 32 */
/* Size field in type word */
#define SIZE(n) ((n) << 12)
#define GETSIZE(w) ((w) >> 12)
#define GETTYPE(t) ((t) & INSTR_TYPE_MASK)
#define MKOP(t, f, s) ((t) | (f) | SIZE(s))
struct instruction_op {
int type;
int reg;
unsigned long val;
unsigned long ea;
int update_reg;
/* For MFSPR */
int spr;
u32 ccval;
u32 xerval;
u8 element_size; /* for VSX/VMX loads/stores */
u8 vsx_flags;
union vsx_reg {
u8 b[16];
u16 h[8];
u32 w[4];
unsigned long d[2];
float fp[4];
double dp[2];
__vector128 v;
* Decode an instruction, and return information about it in *op
* without changing *regs.
* Return value is 1 if the instruction can be emulated just by
* updating *regs with the information in *op, -1 if we need the
* GPRs but *regs doesn't contain the full register set, or 0
* otherwise.
extern int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
unsigned int instr);
* Emulate an instruction that can be executed just by updating
* fields in *regs.
void emulate_update_regs(struct pt_regs *reg, struct instruction_op *op);
* Emulate instructions that cause a transfer of control,
* arithmetic/logical instructions, loads and stores,
* cache operations and barriers.
* Returns 1 if the instruction was emulated successfully,
* 0 if it could not be emulated, or -1 for an instruction that
* should not be emulated (rfid, mtmsrd clearing MSR_RI, etc.).
extern int emulate_step(struct pt_regs *regs, unsigned int instr);
* Emulate a load or store instruction by reading/writing the
* memory of the current process. FP/VMX/VSX registers are assumed
* to hold live values if the appropriate enable bit in regs->msr is
* set; otherwise this will use the saved values in the thread struct
* for user-mode accesses.
extern int emulate_loadstore(struct pt_regs *regs, struct instruction_op *op);
extern void emulate_vsx_load(struct instruction_op *op, union vsx_reg *reg,
const void *mem, bool cross_endian);
extern void emulate_vsx_store(struct instruction_op *op,
const union vsx_reg *reg, void *mem,
bool cross_endian);
extern int emulate_dcbz(unsigned long ea, struct pt_regs *regs);