/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is [Open Source Virtual Machine].
 *
 * The Initial Developer of the Original Code is
 * Adobe System Incorporated.
 * Portions created by the Initial Developer are Copyright (C) 2004-2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Adobe AS3 Team
 *   Vladimir Vukicevic <vladimir@pobox.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */


#ifndef __nanojit_NativeArm__
#define __nanojit_NativeArm__


#ifdef PERFM
#include "../vprof/vprof.h"
#define count_instr() _nvprof("arm",1)
#define count_prolog() _nvprof("arm-prolog",1); count_instr();
#define count_imt() _nvprof("arm-imt",1) count_instr()
#else
#define count_instr()
#define count_prolog()
#define count_imt()
#endif

namespace nanojit
{

const int NJ_LOG2_PAGE_SIZE = 12;       // 4K

// only d0-d6 are actually used; we'll use d7 as s14-s15 for i2f/u2f/etc.
#define NJ_VFP_MAX_REGISTERS            8

#define NJ_MAX_REGISTERS                (11 + NJ_VFP_MAX_REGISTERS)
#define NJ_MAX_STACK_ENTRY              256
#define NJ_MAX_PARAMETERS               16
#define NJ_ALIGN_STACK                  8
#define NJ_STACK_OFFSET                 0

#define NJ_CONSTANT_POOLS
const int NJ_MAX_CPOOL_OFFSET = 4096;
const int NJ_CPOOL_SIZE = 16;

const int LARGEST_UNDERRUN_PROT = 32;  // largest value passed to underrunProtect

typedef int NIns;

/* ARM registers */
typedef enum {
    R0  = 0,
    R1  = 1,
    R2  = 2,
    R3  = 3,
    R4  = 4,
    R5  = 5,
    R6  = 6,
    R7  = 7,
    R8  = 8,
    R9  = 9,
    R10 = 10,
    FP  = 11,
    IP  = 12,
    SP  = 13,
    LR  = 14,
    PC  = 15,

    // FP regs
    D0 = 16,
    D1 = 17,
    D2 = 18,
    D3 = 19,
    D4 = 20,
    D5 = 21,
    D6 = 22,
    D7 = 23,

    FirstFloatReg = 16,
    LastFloatReg = 22,
        
    FirstReg = 0,
    LastReg = 23,
    UnknownReg = 31,

    // special value referring to S14
    FpSingleScratch = 24
} Register;

/* ARM condition codes */
typedef enum {
    EQ = 0x0, // Equal
    NE = 0x1, // Not Equal
    CS = 0x2, // Carry Set (or HS)
    CC = 0x3, // Carry Clear (or LO)
    MI = 0x4, // MInus
    PL = 0x5, // PLus
    VS = 0x6, // oVerflow Set
    VC = 0x7, // oVerflow Clear
    HI = 0x8, // HIgher
    LS = 0x9, // Lower or Same
    GE = 0xA, // Greater or Equal
    LT = 0xB, // Less Than
    GT = 0xC, // Greater Than
    LE = 0xD, // Less or Equal
    AL = 0xE, // ALways
    NV = 0xF  // NeVer
} ConditionCode;

typedef int RegisterMask;
typedef struct _FragInfo {
    RegisterMask    needRestoring;
    NIns*           epilogue;
} FragInfo;

// D0-D6 are not saved; D7-D15 are, but we don't use those,
// so we don't have to worry about saving/restoring them
static const RegisterMask SavedFpRegs = 0;
static const RegisterMask SavedRegs = 1<<R4 | 1<<R5 | 1<<R6 | 1<<R7 | 1<<R8 | 1<<R9 | 1<<R10;
static const int NumSavedRegs = 7;

static const RegisterMask FpRegs = 1<<D0 | 1<<D1 | 1<<D2 | 1<<D3 | 1<<D4 | 1<<D5 | 1<<D6; // no D7; S14-S15 are used for i2f/u2f.
static const RegisterMask GpRegs = 0x07FF;
static const RegisterMask AllowableFlagRegs = 1<<R0 | 1<<R1 | 1<<R2 | 1<<R3 | 1<<R4 | 1<<R5 | 1<<R6 | 1<<R7 | 1<<R8 | 1<<R9 | 1<<R10;

#define IsFpReg(_r)     ((rmask(_r) & (FpRegs | (1<<D7))) != 0)
#define IsGpReg(_r)     ((rmask(_r) & (GpRegs | (1<<IP))) != 0)
#define FpRegNum(_fpr)  ((_fpr) - FirstFloatReg)

#define firstreg()      R0
#define nextreg(r)      ((Register)((int)(r)+1))
#if 0
static Register nextreg(Register r) {
    if (r == R10)
        return D0;
    return (Register)(r+1);
}
#endif
// only good for normal regs
#define imm2register(c) (Register)(c-1)

verbose_only( extern const char* regNames[]; )
verbose_only( extern const char* condNames[]; )
verbose_only( extern const char* shiftNames[]; )

// abstract to platform specific calls
#define nExtractPlatformFlags(x)    0

#define DECLARE_PLATFORM_STATS()

#define DECLARE_PLATFORM_REGALLOC()

#define DECLARE_PLATFORM_ASSEMBLER()                                    \
    const static Register argRegs[4], retRegs[2];                       \
    void LD32_nochk(Register r, int32_t imm);                           \
    void BL(NIns*);                                                     \
    void JMP_far(NIns*);                                                \
    void B_cond_chk(ConditionCode, NIns*, bool);                        \
    void underrunProtect(int bytes);                                    \
    void nativePageReset();                                             \
    void nativePageSetup();                                             \
    void asm_quad_nochk(Register, const int32_t*);                      \
    void asm_add_imm(Register, Register, int32_t, int stat = 0);        \
    void asm_sub_imm(Register, Register, int32_t, int stat = 0);        \
    void asm_cmpi(Register, int32_t imm);                               \
    void asm_ldr_chk(Register d, Register b, int32_t off, bool chk);    \
    void asm_ld_imm(Register d, int32_t imm);                           \
    void asm_arg(ArgSize sz, LInsp arg, Register& r, int& stkd);        \
    int* _nSlot;                                                        \
    int* _nExitSlot;


//printf("jmp_l_n count=%d, nins=%X, %X = %X\n", (_c), nins, _nIns, ((intptr_t)(nins+(_c))-(intptr_t)_nIns - 4) );

#define swapptrs()  {                                                   \
        NIns* _tins = _nIns; _nIns=_nExitIns; _nExitIns=_tins;          \
        int* _nslot = _nSlot;                                           \
        _nSlot = _nExitSlot;                                            \
        _nExitSlot = _nslot;                                            \
    }


#define IMM32(imm)  *(--_nIns) = (NIns)((imm));

#define OP_IMM  (1<<25)
#define OP_STAT (1<<20)

#define COND_AL (0xE<<28)

typedef enum {
    LSL_imm = 0, // LSL #c - Logical Shift Left
    LSL_reg = 1, // LSL Rc - Logical Shift Left
    LSR_imm = 2, // LSR #c - Logical Shift Right
    LSR_reg = 3, // LSR Rc - Logical Shift Right
    ASR_imm = 4, // ASR #c - Arithmetic Shift Right
    ASR_reg = 5, // ASR Rc - Arithmetic Shift Right
    ROR_imm = 6, // Rotate Right (c != 0)
    RRX     = 6, // Rotate Right one bit with extend (c == 0)
    ROR_reg = 7  // Rotate Right
} ShiftOperator;

#define LD32_size 8

#define BEGIN_NATIVE_CODE(x)                    \
    { DWORD* _nIns = (uint8_t*)x

#define END_NATIVE_CODE(x)                      \
    (x) = (dictwordp*)_nIns; }

// BX 
#define BX(_r)  do {                                                    \
        underrunProtect(4);                                             \
        *(--_nIns) = (NIns)( COND_AL | (0x12<<20) | (0xFFF<<8) | (1<<4) | (_r)); \
        asm_output("bx LR"); } while(0)

/*
 * ALU operations
 */

enum {
    ARM_and = 0,
    ARM_eor = 1,
    ARM_sub = 2,
    ARM_rsb = 3,
    ARM_add = 4,
    ARM_adc = 5,
    ARM_sbc = 6,
    ARM_rsc = 7,
    ARM_tst = 8,
    ARM_teq = 9,
    ARM_cmp = 10,
    ARM_cmn = 11,
    ARM_orr = 12,
    ARM_mov = 13,
    ARM_bic = 14,
    ARM_mvn = 15
};

// ALU operation with register and 8-bit immediate arguments
//  S   - bit, 0 or 1, whether the CPSR register is updated
//  rd  - destination register
//  rl  - first (left) operand register
//  imm - immediate (max 8 bits)
#define ALUi(cond, op, S, rd, rl, imm) do {\
        underrunProtect(4);\
        NanoAssert(isU8(imm));\
        *(--_nIns) = (NIns) ((cond)<<28 | OP_IMM | (ARM_##op)<<21 | (S)<<20 | (rl)<<16 | (rd)<<12 | (imm));\
        if (ARM_##op == ARM_mov || ARM_##op == ARM_mvn)\
            asm_output("%s%s%s %s, #0x%X", #op, condNames[cond], (S)?"s":"", gpn(rd), (imm));\
        else if (ARM_##op >= ARM_tst && ARM_##op <= ARM_cmn) {\
            NanoAssert(S==1);\
            asm_output("%s%s %s, #0x%X", #op, condNames[cond], gpn(rl), (imm));\
        } else\
            asm_output("%s%s%s %s, %s, #0x%X", #op, condNames[cond], (S)?"s":"", gpn(rd), gpn(rl), (imm));\
    } while (0)

// ALU operation with register and rotated 8-bit immediate arguments
//  S   - bit, 0 or 1, whether the CPSR register is updated
//  rd  - destination register
//  rl  - first (left) operand register
//  imm - immediate (max 8 bits)
//  rot - rotation to apply to imm
#define ALUi_rot(cond, op, S, rd, rl, imm, rot) do {\
        underrunProtect(4);\
        NanoAssert(isU8(imm));\
        *(--_nIns) = (NIns) ((cond)<<28 | OP_IMM | (ARM_##op)<<21 | (S)<<20 | (rl)<<16 | (rd)<<12 | (rot)<<8 | (imm));\
        if (ARM_##op == ARM_mov || ARM_##op == ARM_mvn)\
            asm_output("%s%s%s %s, #0x%X, %d", #op, condNames[cond], (S)?"s":"", gpn(rd), (imm), (rot)*2);\
        else if (ARM_##op >= ARM_tst && ARM_##op <= ARM_cmn) {\
            NanoAssert(S==1);\
            asm_output("%s%s %s, #0x%X, %d", #op, condNames[cond], gpn(rl), (imm), (rot)*2);\
        } else\
            asm_output("%s%s%s %s, %s, #0x%X, %d", #op, condNames[cond], (S)?"s":"", gpn(rd), gpn(rl), (imm), (rot)*2);\
    } while (0)


// ALU operation with two register arguments
//  S   - bit, 0 or 1, whether the CPSR register is updated
//  rd  - destination register
//  rl  - first (left) operand register
//  rr  - first (left) operand register
#define ALUr(cond, op, S, rd, rl, rr) do {\
        underrunProtect(4);\
        *(--_nIns) = (NIns) ((cond)<<28 |(ARM_##op)<<21 | (S)<<20 | (rl)<<16 | (rd)<<12 | (rr));\
        if (ARM_##op == ARM_mov || ARM_##op == ARM_mvn)\
            asm_output("%s%s%s %s, %s", #op, condNames[cond], (S)?"s":"", gpn(rd), gpn(rr));\
        else if (ARM_##op >= ARM_tst && ARM_##op <= ARM_cmn) {\
            NanoAssert(S==1);\
            asm_output("%s%s  %s, %s", #op, condNames[cond], gpn(rl), gpn(rr));\
        } else\
            asm_output("%s%s%s %s, %s, %s", #op, condNames[cond], (S)?"s":"", gpn(rd), gpn(rl), gpn(rr));\
    } while (0)

// ALU operation with two register arguments, with rr operated on by a shift and shift immediate
//  S   - bit, 0 or 1, whether the CPSR register is updated
//  rd  - destination register
//  rl  - first (left) operand register
//  rr  - first (left) operand register
//  sh  - a ShiftOperator
//  imm - immediate argument to shift operator, 5 bits (0..31)
#define ALUr_shi(cond, op, S, rd, rl, rr, sh, imm) do {\
        underrunProtect(4);\
        NanoAssert((imm)>=0 && (imm)<32);\
        *(--_nIns) = (NIns) ((cond)<<28 |(ARM_##op)<<21 | (S)<<20 | (rl)<<16 | (rd)<<12 | (imm)<<7 | (sh)<<4 | (rr));\
        if (ARM_##op == ARM_mov || ARM_##op == ARM_mvn)\
            asm_output("%s%s%s %s, %s, %s #%d", #op, condNames[cond], (S)?"s":"", gpn(rd), gpn(rr), shiftNames[sh], (imm));\
        else if (ARM_##op >= ARM_tst && ARM_##op <= ARM_cmn) {\
            NanoAssert(S==1);\
            asm_output("%s%s  %s, %s, %s #%d", #op, condNames[cond], gpn(rl), gpn(rr), shiftNames[sh], (imm));\
        } else\
            asm_output("%s%s%s %s, %s, %s, %s #%d", #op, condNames[cond], (S)?"s":"", gpn(rd), gpn(rl), gpn(rr), shiftNames[sh], (imm));\
    } while (0)

// ALU operation with two register arguments, with rr operated on by a shift and shift register
//  S   - bit, 0 or 1, whether the CPSR register is updated
//  rd  - destination register
//  rl  - first (left) operand register
//  rr  - first (left) operand register
//  sh  - a ShiftOperator
//  rs  - shift operand register
#define ALUr_shr(cond, op, S, rd, rl, rr, sh, rs) do {\
        underrunProtect(4);\
        *(--_nIns) = (NIns) ((cond)<<28 |(ARM_##op)<<21 | (S)<<20 | (rl)<<16 | (rd)<<12 | (rs)<<8 | (sh)<<4 | (rr));\
        if (ARM_##op == ARM_mov || ARM_##op == ARM_mvn)\
            asm_output("%s%s%s %s, %s, %s %s", #op, condNames[cond], (S)?"s":"", gpn(rd), gpn(rr), shiftNames[sh], gpn(rs));\
        else if (ARM_##op >= ARM_tst && ARM_##op <= ARM_cmn) {\
            NanoAssert(S==1);\
            asm_output("%s%s  %s, %s, %s %s", #op, condNames[cond], gpn(rl), gpn(rr), shiftNames[sh], gpn(rs));\
        } else\
            asm_output("%s%s%s %s, %s, %s, %s %s", #op, condNames[cond], (S)?"s":"", gpn(rd), gpn(rl), gpn(rr), shiftNames[sh], gpn(rs));\
    } while (0)

// _d = _l OR _r
#define ORR(_d,_l,_r) ALUr(AL, orr, 0, _d, _l, _r)

// _d = _l OR _imm
#define ORRi(_d,_l,_imm) ALUi(AL, orr, 0, _d, _l, _imm)

// _d = _l AND _r
#define AND(_d,_l,_r) ALUr(AL, and, 0, _d, _l, _r)

// _d = _l AND _imm
#define ANDi(_d,_l,_imm) ALUi(AL, and, 0, _d, _l, _imm)

// _d = _l ^ _r
#define EOR(_d,_l,_r) ALUr(AL, eor, 0, _d, _l, _r)

// _d = _l ^ _imm
#define EORi(_d,_l,_imm) ALUi(AL, eor, 0, _d, _l, _imm)

// _d = _l + _r; update flags
#define ADD(_d,_l,_r) ALUr(AL, add, 1, _d, _l, _r)

// _d = _l + _r; update flags if _stat == 1
#define ADDs(_d,_l,_r,_stat) ALUr(AL, add, _stat, _d, _l, _r)

// _d = _l + _imm; update flags
#define ADDi(_d,_l,_imm) asm_add_imm(_d, _l, _imm, 1)

// _d = _l + _imm; update flags if _stat == 1
#define ADDis(_d,_l,_imm,_stat) asm_add_imm(_d, _l, _imm, _stat)

// _d = _l - _r; update flags
#define SUB(_d,_l,_r) ALUr(AL, sub, 1, _d, _l, _r)

// _d = _l - _imm; update flags
#define SUBi(_d,_l,_imm)  asm_sub_imm(_d, _l, _imm, 1)

// _l = _l * _r
#define MUL(_l,_r)  do {                                                \
        underrunProtect(4);                                             \
        *(--_nIns) = (NIns)( COND_AL | (_l)<<16 | (_l)<<8 | 0x90 | (_r) ); \
        asm_output("mul %s,%s",gpn(_l),gpn(_r)); } while(0)

// _d = 0 - _r
#define RSBS(_d,_r) ALUi(AL, rsb, 1, _d, _r, 0)

// _d = ~_r (one's compliment)
#define MVN(_d,_r) ALUr(AL, mvn, 0, _d, 0, _r)

// MOVS _d, _r, LSR <_s>
// _d = _r >> _s
#define SHR(_d,_r,_s) ALUr_shr(AL, mov, 1, _d, 0, _r, LSR_reg, _s)

// MOVS _d, _r, LSR #_imm
// _d = _r >> _imm
#define SHRi(_d,_r,_imm)  ALUr_shi(AL, mov, 1, _d, 0, _r, LSR_imm, _imm)

// MOVS _d, _r, ASR <_s>
// _d = _r >> _s
#define SAR(_d,_r,_s) ALUr_shr(AL, mov, 1, _d, 0, _r, ASR_reg, _s)

// MOVS _r, _r, ASR #_imm
// _d = _r >> _imm
#define SARi(_d,_r,_imm) ALUr_shi(AL, mov, 1, _d, 0, _r, ASR_imm, _imm)

// MOVS _d, _r, LSL <_s>
// _d = _r << _s
#define SHL(_d, _r, _s) ALUr_shr(AL, mov, 1, _d, 0, _r, LSL_reg, _s)

// MOVS _d, _r, LSL #_imm
// _d = _r << _imm
#define SHLi(_d, _r, _imm) ALUr_shi(AL, mov, 1, _d, 0, _r, LSL_imm, _imm)
                    
// TST
#define TEST(_l,_r)     ALUr(AL, tst, 1, 0, _l, _r)
#define TSTi(_d,_imm)   ALUi(AL, tst, 1, 0, _d, _imm)

// CMP
#define CMP(_l,_r)  ALUr(AL, cmp, 1, 0, _l, _r)

// MOV

#define MOV_cond(_cond,_d,_s) ALUr(_cond, mov, 0, _d, 0, _s)

#define MOV(dr,sr)   MOV_cond(AL, dr, sr)
#define MOVEQ(dr,sr) MOV_cond(EQ, dr, sr)
#define MOVNE(dr,sr) MOV_cond(NE, dr, sr)
#define MOVLT(dr,sr) MOV_cond(LT, dr, sr)
#define MOVLE(dr,sr) MOV_cond(LE, dr, sr)
#define MOVGT(dr,sr) MOV_cond(GT, dr, sr)
#define MOVGE(dr,sr) MOV_cond(GE, dr, sr)
#define MOVCC(dr,sr) MOV_cond(CC, dr, sr)
#define MOVLS(dr,sr) MOV_cond(LS, dr, sr)
#define MOVHI(dr,sr) MOV_cond(HI, dr, sr)
#define MOVCS(dr,sr) MOV_cond(CS, dr, sr)
#define MOVVC(dr,sr) MOV_cond(VC, dr, sr) // overflow clear
#define MOVNC(dr,sr) MOV_cond(CC, dr, sr) // carry clear

// _d = [_b+off]
#define LDR(_d,_b,_off)        asm_ldr_chk(_d,_b,_off,1)
#define LDR_nochk(_d,_b,_off)  asm_ldr_chk(_d,_b,_off,0)

// _d = #_imm
#define LDi(_d,_imm) asm_ld_imm(_d,_imm)

// MOVW and MOVT are ARMv6T2 or newer only

// MOVW -- writes _imm into _d, zero-extends.
#define MOVW_cond(_cond,_d,_imm) do {                                   \
        NanoAssert(isU16(_imm) || isS16(_imm));                         \
        underrunProtect(4);                                             \
        *(--_nIns) = (NIns)( (_cond)<<28 | 3<<24 | 0<<20 | (((_imm)>>12)&0xf)<<16 | (_d)<<12 | (_imm)&0xfff ); \
        asm_output("movw%s %s, #0x%x", condNames[_cond], gpn(_d), (_imm)); \
    } while (0)

#define MOVW(_d,_imm) MOVW_cond(AL, _d, _imm)

// MOVT -- writes _imm into top halfword of _d, does not affect bottom halfword
#define MOVT_cond(_cond,_d,_imm) do {                                   \
        NanoAssert(isU16(_imm) || isS16(_imm));                         \
        underrunProtect(4);                                             \
        *(--_nIns) = (NIns)( (_cond)<<28 | 3<<24 | 4<<20 | (((_imm)>>12)&0xf)<<16 | (_d)<<12 | (_imm)&0xfff ); \
        asm_output("movt%s %s, #0x%x", condNames[_cond], gpn(_d), (_imm)); \
    } while (0)

#define MOVT(_d,_imm) MOVT_cond(AL, _d, _imm)

// i386 compat, for Assembler.cpp
#define MR(d,s) MOV(d,s)
#define LD(reg,offset,base)    asm_ldr_chk(reg,base,offset,1)
#define ST(base,offset,reg)    STR(reg,base,offset)

// load 8-bit, zero extend (aka LDRB) note, only 5-bit offsets (!) are
// supported for this, but that's all we need at the moment.
// (LDRB/LDRH actually allow a 12-bit offset in ARM mode but
// constraining to 5-bit gives us advantage for Thumb)
#define LDRB(_d,_off,_b) do {                                           \
        NanoAssert((_off)>=0&&(_off)<=31);                              \
        underrunProtect(4);                                             \
        *(--_nIns) = (NIns)( COND_AL | (0x5D<<20) | ((_b)<<16) | ((_d)<<12) | ((_off)&0xfff)  ); \
        asm_output("ldrb %s,%d(%s)", gpn(_d),(_off),gpn(_b));          \
    } while(0)

// P and U
#define LDRH(_d,_off,_b) do {                  \
        NanoAssert((_off)>=0&&(_off)<=31);      \
        underrunProtect(4);                     \
        *(--_nIns) = (NIns)( COND_AL | (0x1D<<20) | ((_b)<<16) | ((_d)<<12) | ((0xB)<<4) | (((_off)&0xf0)<<4) | ((_off)&0xf) ); \
        asm_output("ldrsh %s,%d(%s)", gpn(_d),(_off),gpn(_b));         \
    } while(0)

#define STR(_d,_n,_off) do {                                            \
        NanoAssert(!IsFpReg(_d) && isS12(_off));                        \
        underrunProtect(4);                                             \
        if ((_off)<0)   *(--_nIns) = (NIns)( COND_AL | (0x50<<20) | ((_n)<<16) | ((_d)<<12) | ((-(_off))&0xFFF) ); \
        else            *(--_nIns) = (NIns)( COND_AL | (0x58<<20) | ((_n)<<16) | ((_d)<<12) | ((_off)&0xFFF) ); \
        asm_output("str %s, [%s, #%d]", gpn(_d), gpn(_n), (_off)); \
    } while(0)

// Rd += _off; [Rd] = Rn
#define STR_preindex(_d,_n,_off) do {                                   \
        NanoAssert(!IsFpReg(_d) && isS12(_off));                        \
        underrunProtect(4);                                             \
        if ((_off)<0)   *(--_nIns) = (NIns)( COND_AL | (0x52<<20) | ((_n)<<16) | ((_d)<<12) | ((-(_off))&0xFFF) ); \
        else            *(--_nIns) = (NIns)( COND_AL | (0x5A<<20) | ((_n)<<16) | ((_d)<<12) | ((_off)&0xFFF) ); \
        asm_output("str %s, [%s, #%d]!", gpn(_d), gpn(_n), (_off));     \
    } while(0)

// [Rd] = Rn ; Rd += _off
#define STR_postindex(_d,_n,_off) do {                                  \
        NanoAssert(!IsFpReg(_d) && isS12(_off));                        \
        underrunProtect(4);                                             \
        if ((_off)<0)   *(--_nIns) = (NIns)( COND_AL | (0x40<<20) | ((_n)<<16) | ((_d)<<12) | ((-(_off))&0xFFF) ); \
        else            *(--_nIns) = (NIns)( COND_AL | (0x48<<20) | ((_n)<<16) | ((_d)<<12) | ((_off)&0xFFF) ); \
        asm_output("str %s, [%s]!, %d", gpn(_d), gpn(_n), (_off));      \
    } while(0)

//#define RET()   underrunProtect(1); *(--_nIns) = 0xc3;    asm_output("ret")
//#define NOP()     underrunProtect(1); *(--_nIns) = 0x90;  asm_output("nop")
//#define INT3()  underrunProtect(1); *(--_nIns) = 0xcc;  asm_output("int3")
//#define RET() INT3()

#define BKPT_insn ((NIns)( (0xE<<24) | (0x12<<20) | (0x7<<4) ))
#define BKPT_nochk() do { \
        *(--_nIns) = BKPT_insn; } while (0)

// this isn't a armv6t2 NOP -- it's a mov r0,r0
#define NOP_nochk() do { \
        *(--_nIns) = (NIns)( COND_AL | (0xD<<21) | ((R0)<<12) | (R0) ); \
        asm_output("nop"); } while(0)

// this is pushing a reg
#define PUSHr(_r)  do {                                                 \
        underrunProtect(4);                                             \
        *(--_nIns) = (NIns)( COND_AL | (0x92<<20) | (SP<<16) | (1<<(_r)) ); \
        asm_output("push %s",gpn(_r)); } while (0)

// STMDB
#define PUSH_mask(_mask)  do {                                          \
        underrunProtect(4);                                             \
        *(--_nIns) = (NIns)( COND_AL | (0x92<<20) | (SP<<16) | (_mask) ); \
        asm_output("push %x", (_mask));} while (0)

// this form of PUSH takes a base + offset
// we need to load into scratch reg, then push onto stack
#define PUSHm(_off,_b)  do {                                            \
        NanoAssert( (int)(_off)>0 );                                    \
        underrunProtect(8);                                             \
        *(--_nIns) = (NIns)( COND_AL | (0x92<<20) | (SP<<16) | (1<<(IP)) ); \
        *(--_nIns) = (NIns)( COND_AL | (0x59<<20) | ((_b)<<16) | ((IP)<<12) | ((_off)&0xFFF) ); \
        asm_output("push %d(%s)",(_off),gpn(_b)); } while (0)

#define POPr(_r) do {                                                   \
        underrunProtect(4);                                             \
        *(--_nIns) = (NIns)( COND_AL | (0x8B<<20) | (SP<<16) | (1<<(_r)) ); \
        asm_output("pop %s",gpn(_r));} while (0)

#define POP_mask(_mask) do {                                            \
        underrunProtect(4);                                             \
        *(--_nIns) = (NIns)( COND_AL | (0x8B<<20) | (SP<<16) | (_mask) ); \
        asm_output("pop %x", (_mask));} while (0)

// PC always points to current instruction + 8, so when calculating pc-relative
// offsets, use PC+8.
#define PC_OFFSET_FROM(target,frompc) ((intptr_t)(target) - ((intptr_t)(frompc) + 8))
#define isS12(offs) ((-(1<<12)) <= (offs) && (offs) < (1<<12))

#define B_cond(_c,_t)                           \
    B_cond_chk(_c,_t,1)

// NB: don't use COND_AL here, we shift the condition into place!
#define JMP(_t)                                 \
    B_cond_chk(AL,_t,1)

#define JMP_nochk(_t)                           \
    B_cond_chk(AL,_t,0)

#define JA(t)   B_cond(HI,t)
#define JNA(t)  B_cond(LS,t)
#define JB(t)   B_cond(CC,t)
#define JNB(t)  B_cond(CS,t)
#define JE(t)   B_cond(EQ,t)
#define JNE(t)  B_cond(NE,t)
#define JBE(t)  B_cond(LS,t)
#define JNBE(t) B_cond(HI,t)
#define JAE(t)  B_cond(CS,t)
#define JNAE(t) B_cond(CC,t)
#define JL(t)   B_cond(LT,t)
#define JNL(t)  B_cond(GE,t)
#define JLE(t)  B_cond(LE,t)
#define JNLE(t) B_cond(GT,t)
#define JGE(t)  B_cond(GE,t)
#define JNGE(t) B_cond(LT,t)
#define JG(t)   B_cond(GT,t)
#define JNG(t)  B_cond(LE,t)
#define JC(t)   B_cond(CS,t)
#define JNC(t)  B_cond(CC,t)
#define JO(t)   B_cond(VS,t)
#define JNO(t)  B_cond(VC,t)

// used for testing result of an FP compare on x86; not used on arm.
// JP = comparison  false
#define JP(t)   do {NanoAssert(0); B_cond(NE,t); asm_output("jp 0x%08x",t); } while(0) 

// JNP = comparison true
#define JNP(t)  do {NanoAssert(0); B_cond(EQ,t); asm_output("jnp 0x%08x",t); } while(0)


// MOV(EQ) _r, #1 
// EOR(NE) _r, _r
#define SET(_r,_cond,_opp) do {                                         \
    underrunProtect(8);                                                 \
    *(--_nIns) = (NIns)( (_opp<<28) | (1<<21) | ((_r)<<16) | ((_r)<<12) | (_r) ); \
    *(--_nIns) = (NIns)( (_cond<<28) | (0x3A<<20) | ((_r)<<12) | (1) ); \
    asm_output("mov%s %s, #1", condNames[_cond], gpn(r), gpn(r));       \
    asm_output("eor%s %s, %s", condNames[_opp], gpn(r), gpn(r));        \
    } while (0)


#define SETE(r)     SET(r,EQ,NE)
#define SETL(r)     SET(r,LT,GE)
#define SETLE(r)    SET(r,LE,GT)
#define SETG(r)     SET(r,GT,LE)
#define SETGE(r)    SET(r,GE,LT)
#define SETB(r)     SET(r,CC,CS)
#define SETBE(r)    SET(r,LS,HI)
#define SETAE(r)    SET(r,CS,CC)
#define SETA(r)     SET(r,HI,LS)
#define SETO(r)     SET(r,VS,LS)
#define SETC(r)     SET(r,CS,LS)

// This zero-extends a reg that has been set using one of the SET macros,
// but is a NOOP on ARM/Thumb
#define MOVZX8(r,r2)

// Load and sign extend a 16-bit value into a reg
#define MOVSX(_d,_off,_b) do {                                          \
        if ((_off)>=0) {                                                \
            if ((_off)<256) {                                           \
                underrunProtect(4);                                     \
                *(--_nIns) = (NIns)( COND_AL | (0x1D<<20) | ((_b)<<16) | ((_d)<<12) |  ((((_off)>>4)&0xF)<<8) | (0xF<<4) | ((_off)&0xF)  ); \
            } else if ((_off)<=510) {                                   \
                underrunProtect(8);                                     \
                int rem = (_off) - 255;                                 \
                NanoAssert(rem<256);                                    \
                *(--_nIns) = (NIns)( COND_AL | (0x1D<<20) | ((_d)<<16) | ((_d)<<12) |  ((((rem)>>4)&0xF)<<8) | (0xF<<4) | ((rem)&0xF)  ); \
                *(--_nIns) = (NIns)( COND_AL | OP_IMM | (1<<23) | ((_b)<<16) | ((_d)<<12) | (0xFF) ); \
            } else {                                                    \
                underrunProtect(16);                                    \
                int rem = (_off) & 3;                                   \
                *(--_nIns) = (NIns)( COND_AL | (0x19<<20) | ((_b)<<16) | ((_d)<<12) | (0xF<<4) | (_d) ); \
                asm_output("ldrsh %s,[%s, #%d]",gpn(_d), gpn(_b), (_off)); \
                *(--_nIns) = (NIns)( COND_AL | OP_IMM | (1<<23) | ((_d)<<16) | ((_d)<<12) | rem ); \
                *(--_nIns) = (NIns)( COND_AL | (0x1A<<20) | ((_d)<<12) | (2<<7)| (_d) ); \
                *(--_nIns) = (NIns)( COND_AL | (0x3B<<20) | ((_d)<<12) | (((_off)>>2)&0xFF) ); \
                asm_output("mov %s,%d",gpn(_d),(_off));                \
            }                                                           \
        } else {                                                        \
            if ((_off)>-256) {                                          \
                underrunProtect(4);                                     \
                *(--_nIns) = (NIns)( COND_AL | (0x15<<20) | ((_b)<<16) | ((_d)<<12) |  ((((-(_off))>>4)&0xF)<<8) | (0xF<<4) | ((-(_off))&0xF)  ); \
                asm_output("ldrsh %s,[%s, #%d]",gpn(_d), gpn(_b), (_off)); \
            } else if ((_off)>=-510){                                   \
                underrunProtect(8);                                     \
                int rem = -(_off) - 255;                                \
                NanoAssert(rem<256);                                    \
                *(--_nIns) = (NIns)( COND_AL | (0x15<<20) | ((_d)<<16) | ((_d)<<12) |  ((((rem)>>4)&0xF)<<8) | (0xF<<4) | ((rem)&0xF)  ); \
                *(--_nIns) = (NIns)( COND_AL | OP_IMM | (1<<22) | ((_b)<<16) | ((_d)<<12) | (0xFF) ); \
            } else NanoAssert(0);                                        \
        }                                                               \
    } while(0)

#define STMIA(_b, _mask) do {                                           \
        underrunProtect(4);                                             \
        NanoAssert(((_mask)&rmask(_b))==0 && isU8(_mask));              \
        *(--_nIns) = (NIns)(COND_AL | (0x8A<<20) | ((_b)<<16) | (_mask)&0xFF); \
        asm_output("stmia %s!,{0x%x}", gpn(_b), _mask); \
    } while (0)

#define LDMIA(_b, _mask) do {                                           \
        underrunProtect(4);                                             \
        NanoAssert(((_mask)&rmask(_b))==0 && isU8(_mask));              \
        *(--_nIns) = (NIns)(COND_AL | (0x8B<<20) | ((_b)<<16) | (_mask)&0xFF); \
        asm_output("ldmia %s!,{0x%x}", gpn(_b), (_mask)); \
    } while (0)

/*
 * VFP
 */

#define FMDRR(_Dm,_Rd,_Rn) do {                                         \
        underrunProtect(4);                                             \
        NanoAssert(IsFpReg(_Dm) && IsGpReg(_Rd) && IsGpReg(_Rn));       \
        *(--_nIns) = (NIns)( COND_AL | (0xC4<<20) | ((_Rn)<<16) | ((_Rd)<<12) | (0xB1<<4) | (FpRegNum(_Dm)) ); \
        asm_output("fmdrr %s,%s,%s", gpn(_Dm), gpn(_Rd), gpn(_Rn));    \
    } while (0)

#define FMRRD(_Rd,_Rn,_Dm) do {                                         \
        underrunProtect(4);                                             \
        NanoAssert(IsGpReg(_Rd) && IsGpReg(_Rn) && IsFpReg(_Dm));       \
        *(--_nIns) = (NIns)( COND_AL | (0xC5<<20) | ((_Rn)<<16) | ((_Rd)<<12) | (0xB1<<4) | (FpRegNum(_Dm)) ); \
        asm_output("fmrrd %s,%s,%s", gpn(_Rd), gpn(_Rn), gpn(_Dm));    \
    } while (0)

#define FMRDH(_Rd,_Dn) do {                                             \
        underrunProtect(4);                                             \
        NanoAssert(IsGpReg(_Rd) && IsFpReg(_Dn));                       \
        *(--_nIns) = (NIns)( COND_AL | (0xE3<<20) | (FpRegNum(_Dn)<<16) | ((_Rd)<<12) | (0xB<<8) | (1<<4) ); \
        asm_output("fmrdh %s,%s", gpn(_Rd), gpn(_Dn));                  \
    } while (0)

#define FMRDL(_Rd,_Dn) do {                                             \
        underrunProtect(4);                                             \
        NanoAssert(IsGpReg(_Rd) && IsFpReg(_Dn));                       \
        *(--_nIns) = (NIns)( COND_AL | (0xE1<<20) | (FpRegNum(_Dn)<<16) | ((_Rd)<<12) | (0xB<<8) | (1<<4) ); \
        asm_output("fmrdh %s,%s", gpn(_Rd), gpn(_Dn));                  \
    } while (0)

#define FSTD(_Dd,_Rn,_offs) do {                                        \
        underrunProtect(4);                                             \
        NanoAssert((((_offs) & 3) == 0) && isS8((_offs) >> 2));         \
        NanoAssert(IsFpReg(_Dd) && !IsFpReg(_Rn));                      \
        int negflag = 1<<23;                                            \
        intptr_t offs = (_offs);                                        \
        if (_offs < 0) {                                                \
            negflag = 0<<23;                                            \
            offs = -(offs);                                             \
        }                                                               \
        *(--_nIns) = (NIns)( COND_AL | (0xD0<<20) | ((_Rn)<<16) | (FpRegNum(_Dd)<<12) | (0xB<<8) | negflag | ((offs>>2)&0xff) ); \
        asm_output("fstd %s,%s(%d)", gpn(_Dd), gpn(_Rn), _offs);    \
    } while (0)

#define FLDD_chk(_Dd,_Rn,_offs,_chk) do {                               \
        if(_chk) underrunProtect(4);                                    \
        NanoAssert((((_offs) & 3) == 0) && isS8((_offs) >> 2));         \
        NanoAssert(IsFpReg(_Dd) && !IsFpReg(_Rn));                      \
        int negflag = 1<<23;                                            \
        intptr_t offs = (_offs);                                        \
        if (_offs < 0) {                                                \
            negflag = 0<<23;                                            \
            offs = -(offs);                                             \
        }                                                               \
        *(--_nIns) = (NIns)( COND_AL | (0xD1<<20) | ((_Rn)<<16) | (FpRegNum(_Dd)<<12) | (0xB<<8) | negflag | ((offs>>2)&0xff) ); \
        asm_output("fldd %s,%s(%d)", gpn(_Dd), gpn(_Rn), _offs);       \
    } while (0)
#define FLDD(_Dd,_Rn,_offs) FLDD_chk(_Dd,_Rn,_offs,1)

#define FSITOD(_Dd,_Sm) do {                                            \
        underrunProtect(4);                                             \
        NanoAssert(IsFpReg(_Dd) && ((_Sm) == FpSingleScratch));         \
        *(--_nIns) = (NIns)( COND_AL | (0xEB8<<16) | (FpRegNum(_Dd)<<12) | (0x2F<<6) | (0<<5) | (0x7) ); \
        asm_output("fsitod %s,%s", gpn(_Dd), gpn(_Sm));                \
    } while (0)


#define FUITOD(_Dd,_Sm) do {                                            \
        underrunProtect(4);                                             \
        NanoAssert(IsFpReg(_Dd) && ((_Sm) == FpSingleScratch));         \
        *(--_nIns) = (NIns)( COND_AL | (0xEB8<<16) | (FpRegNum(_Dd)<<12) | (0x2D<<6) | (0<<5) | (0x7) ); \
        asm_output("fuitod %s,%s", gpn(_Dd), gpn(_Sm));                \
    } while (0)

#define FMSR(_Sn,_Rd) do {                                              \
        underrunProtect(4);                                             \
        NanoAssert(((_Sn) == FpSingleScratch) && IsGpReg(_Rd));         \
        *(--_nIns) = (NIns)( COND_AL | (0xE0<<20) | (0x7<<16) | ((_Rd)<<12) | (0xA<<8) | (0<<7) | (0x1<<4) ); \
        asm_output("fmsr %s,%s", gpn(_Sn), gpn(_Rd));                  \
    } while (0)

#define FNEGD(_Dd,_Dm) do {                                             \
        underrunProtect(4);                                             \
        NanoAssert(IsFpReg(_Dd) && IsFpReg(_Dm));                       \
        *(--_nIns) = (NIns)( COND_AL | (0xEB1<<16) | (FpRegNum(_Dd)<<12) | (0xB4<<4) | (FpRegNum(_Dm)) ); \
        asm_output("fnegd %s,%s", gpn(_Dd), gpn(_Dm));                 \
    } while (0)

#define FADDD(_Dd,_Dn,_Dm) do {                                         \
        underrunProtect(4);                                             \
        NanoAssert(IsFpReg(_Dd) && IsFpReg(_Dn) && IsFpReg(_Dm));       \
        *(--_nIns) = (NIns)( COND_AL | (0xE3<<20) | (FpRegNum(_Dn)<<16) | (FpRegNum(_Dd)<<12) | (0xB0<<4) | (FpRegNum(_Dm)) ); \
        asm_output("faddd %s,%s,%s", gpn(_Dd), gpn(_Dn), gpn(_Dm));    \
    } while (0)

#define FSUBD(_Dd,_Dn,_Dm) do {                                         \
        underrunProtect(4);                                             \
        NanoAssert(IsFpReg(_Dd) && IsFpReg(_Dn) && IsFpReg(_Dm));       \
        *(--_nIns) = (NIns)( COND_AL | (0xE3<<20) | (FpRegNum(_Dn)<<16) | (FpRegNum(_Dd)<<12) | (0xB4<<4) | (FpRegNum(_Dm)) ); \
        asm_output("fsubd %s,%s,%s", gpn(_Dd), gpn(_Dn), gpn(_Dm));    \
    } while (0)

#define FMULD(_Dd,_Dn,_Dm) do {                                         \
        underrunProtect(4);                                             \
        NanoAssert(IsFpReg(_Dd) && IsFpReg(_Dn) && IsFpReg(_Dm));       \
        *(--_nIns) = (NIns)( COND_AL | (0xE2<<20) | (FpRegNum(_Dn)<<16) | (FpRegNum(_Dd)<<12) | (0xB0<<4) | (FpRegNum(_Dm)) ); \
        asm_output("fmuld %s,%s,%s", gpn(_Dd), gpn(_Dn), gpn(_Dm));    \
    } while (0)

#define FDIVD(_Dd,_Dn,_Dm) do {                                         \
        underrunProtect(4);                                             \
        NanoAssert(IsFpReg(_Dd) && IsFpReg(_Dn) && IsFpReg(_Dm));       \
        *(--_nIns) = (NIns)( COND_AL | (0xE8<<20) | (FpRegNum(_Dn)<<16) | (FpRegNum(_Dd)<<12) | (0xB0<<4) | (FpRegNum(_Dm)) ); \
        asm_output("fmuld %s,%s,%s", gpn(_Dd), gpn(_Dn), gpn(_Dm));    \
    } while (0)

#define FMSTAT() do {                               \
        underrunProtect(4);                         \
        *(--_nIns) = (NIns)( COND_AL | 0x0EF1FA10); \
        asm_output("fmstat");                       \
    } while (0)

#define FCMPD(_Dd,_Dm) do {                                             \
        underrunProtect(4);                                             \
        NanoAssert(IsFpReg(_Dd) && IsFpReg(_Dm));                       \
        *(--_nIns) = (NIns)( COND_AL | (0xEB4<<16) | (FpRegNum(_Dd)<<12) | (0xB4<<4) | (FpRegNum(_Dm)) ); \
        asm_output("fcmpd %s,%s", gpn(_Dd), gpn(_Dm));                 \
    } while (0)

#define FCPYD(_Dd,_Dm) do {                                             \
        underrunProtect(4);                                             \
        NanoAssert(IsFpReg(_Dd) && IsFpReg(_Dm));                       \
        *(--_nIns) = (NIns)( COND_AL | (0xEB0<<16) | (FpRegNum(_Dd)<<12) | (0xB4<<4) | (FpRegNum(_Dm)) ); \
        asm_output("fcpyd %s,%s", gpn(_Dd), gpn(_Dm));                 \
    } while (0)
}
#endif // __nanojit_NativeThumb__