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