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qemu/tcg/arm/tcg-target.c
Richard Henderson 96d0ee7f09 tcg: Remove unreachable code in tcg_out_op and op_defs 
The INDEX_op_call case has just been obsoleted; the mov and movi
cases have not been reachable for years.  Attempt to document this
both in each tcg_out_op switch, and via TCG_OPF_NOT_PRESENT.

Because of the TCG_OPF_NOT_PRESENT change, this must be done for
all targets in a single commit.

Signed-off-by: Richard Henderson <rth@twiddle.net>
2014-05-12 11:13:13 -07:00

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/*
* Tiny Code Generator for QEMU
*
* Copyright (c) 2008 Andrzej Zaborowski
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "elf.h"
#include "tcg-be-ldst.h"
/* The __ARM_ARCH define is provided by gcc 4.8. Construct it otherwise. */
#ifndef __ARM_ARCH
# if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
|| defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
|| defined(__ARM_ARCH_7EM__)
# define __ARM_ARCH 7
# elif defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
|| defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) \
|| defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6T2__)
# define __ARM_ARCH 6
# elif defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5E__) \
|| defined(__ARM_ARCH_5T__) || defined(__ARM_ARCH_5TE__) \
|| defined(__ARM_ARCH_5TEJ__)
# define __ARM_ARCH 5
# else
# define __ARM_ARCH 4
# endif
#endif
static int arm_arch = __ARM_ARCH;
#if defined(__ARM_ARCH_5T__) \
|| defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_5TEJ__)
# define use_armv5t_instructions 1
#else
# define use_armv5t_instructions use_armv6_instructions
#endif
#define use_armv6_instructions (__ARM_ARCH >= 6 || arm_arch >= 6)
#define use_armv7_instructions (__ARM_ARCH >= 7 || arm_arch >= 7)
#ifndef use_idiv_instructions
bool use_idiv_instructions;
#endif
/* ??? Ought to think about changing CONFIG_SOFTMMU to always defined. */
#ifdef CONFIG_SOFTMMU
# define USING_SOFTMMU 1
#else
# define USING_SOFTMMU 0
#endif
#ifndef NDEBUG
static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
"%r0",
"%r1",
"%r2",
"%r3",
"%r4",
"%r5",
"%r6",
"%r7",
"%r8",
"%r9",
"%r10",
"%r11",
"%r12",
"%r13",
"%r14",
"%pc",
};
#endif
static const int tcg_target_reg_alloc_order[] = {
TCG_REG_R4,
TCG_REG_R5,
TCG_REG_R6,
TCG_REG_R7,
TCG_REG_R8,
TCG_REG_R9,
TCG_REG_R10,
TCG_REG_R11,
TCG_REG_R13,
TCG_REG_R0,
TCG_REG_R1,
TCG_REG_R2,
TCG_REG_R3,
TCG_REG_R12,
TCG_REG_R14,
};
static const int tcg_target_call_iarg_regs[4] = {
TCG_REG_R0, TCG_REG_R1, TCG_REG_R2, TCG_REG_R3
};
static const int tcg_target_call_oarg_regs[2] = {
TCG_REG_R0, TCG_REG_R1
};
#define TCG_REG_TMP TCG_REG_R12
static inline void reloc_pc24(tcg_insn_unit *code_ptr, tcg_insn_unit *target)
{
ptrdiff_t offset = (tcg_ptr_byte_diff(target, code_ptr) - 8) >> 2;
*code_ptr = (*code_ptr & ~0xffffff) | (offset & 0xffffff);
}
static void patch_reloc(tcg_insn_unit *code_ptr, int type,
intptr_t value, intptr_t addend)
{
assert(type == R_ARM_PC24);
assert(addend == 0);
reloc_pc24(code_ptr, (tcg_insn_unit *)value);
}
#define TCG_CT_CONST_ARM 0x100
#define TCG_CT_CONST_INV 0x200
#define TCG_CT_CONST_NEG 0x400
#define TCG_CT_CONST_ZERO 0x800
/* parse target specific constraints */
static int target_parse_constraint(TCGArgConstraint *ct, const char **pct_str)
{
const char *ct_str;
ct_str = *pct_str;
switch (ct_str[0]) {
case 'I':
ct->ct |= TCG_CT_CONST_ARM;
break;
case 'K':
ct->ct |= TCG_CT_CONST_INV;
break;
case 'N': /* The gcc constraint letter is L, already used here. */
ct->ct |= TCG_CT_CONST_NEG;
break;
case 'Z':
ct->ct |= TCG_CT_CONST_ZERO;
break;
case 'r':
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, (1 << TCG_TARGET_NB_REGS) - 1);
break;
/* qemu_ld address */
case 'l':
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, (1 << TCG_TARGET_NB_REGS) - 1);
#ifdef CONFIG_SOFTMMU
/* r0-r2,lr will be overwritten when reading the tlb entry,
so don't use these. */
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R0);
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R1);
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R2);
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R14);
#endif
break;
/* qemu_st address & data */
case 's':
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, (1 << TCG_TARGET_NB_REGS) - 1);
/* r0-r2 will be overwritten when reading the tlb entry (softmmu only)
and r0-r1 doing the byte swapping, so don't use these. */
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R0);
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R1);
#if defined(CONFIG_SOFTMMU)
/* Avoid clashes with registers being used for helper args */
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R2);
#if TARGET_LONG_BITS == 64
/* Avoid clashes with registers being used for helper args */
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R3);
#endif
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R14);
#endif
break;
default:
return -1;
}
ct_str++;
*pct_str = ct_str;
return 0;
}
static inline uint32_t rotl(uint32_t val, int n)
{
return (val << n) | (val >> (32 - n));
}
/* ARM immediates for ALU instructions are made of an unsigned 8-bit
right-rotated by an even amount between 0 and 30. */
static inline int encode_imm(uint32_t imm)
{
int shift;
/* simple case, only lower bits */
if ((imm & ~0xff) == 0)
return 0;
/* then try a simple even shift */
shift = ctz32(imm) & ~1;
if (((imm >> shift) & ~0xff) == 0)
return 32 - shift;
/* now try harder with rotations */
if ((rotl(imm, 2) & ~0xff) == 0)
return 2;
if ((rotl(imm, 4) & ~0xff) == 0)
return 4;
if ((rotl(imm, 6) & ~0xff) == 0)
return 6;
/* imm can't be encoded */
return -1;
}
static inline int check_fit_imm(uint32_t imm)
{
return encode_imm(imm) >= 0;
}
/* Test if a constant matches the constraint.
* TODO: define constraints for:
*
* ldr/str offset: between -0xfff and 0xfff
* ldrh/strh offset: between -0xff and 0xff
* mov operand2: values represented with x << (2 * y), x < 0x100
* add, sub, eor...: ditto
*/
static inline int tcg_target_const_match(tcg_target_long val, TCGType type,
const TCGArgConstraint *arg_ct)
{
int ct;
ct = arg_ct->ct;
if (ct & TCG_CT_CONST) {
return 1;
} else if ((ct & TCG_CT_CONST_ARM) && check_fit_imm(val)) {
return 1;
} else if ((ct & TCG_CT_CONST_INV) && check_fit_imm(~val)) {
return 1;
} else if ((ct & TCG_CT_CONST_NEG) && check_fit_imm(-val)) {
return 1;
} else if ((ct & TCG_CT_CONST_ZERO) && val == 0) {
return 1;
} else {
return 0;
}
}
#define TO_CPSR (1 << 20)
typedef enum {
ARITH_AND = 0x0 << 21,
ARITH_EOR = 0x1 << 21,
ARITH_SUB = 0x2 << 21,
ARITH_RSB = 0x3 << 21,
ARITH_ADD = 0x4 << 21,
ARITH_ADC = 0x5 << 21,
ARITH_SBC = 0x6 << 21,
ARITH_RSC = 0x7 << 21,
ARITH_TST = 0x8 << 21 | TO_CPSR,
ARITH_CMP = 0xa << 21 | TO_CPSR,
ARITH_CMN = 0xb << 21 | TO_CPSR,
ARITH_ORR = 0xc << 21,
ARITH_MOV = 0xd << 21,
ARITH_BIC = 0xe << 21,
ARITH_MVN = 0xf << 21,
INSN_LDR_IMM = 0x04100000,
INSN_LDR_REG = 0x06100000,
INSN_STR_IMM = 0x04000000,
INSN_STR_REG = 0x06000000,
INSN_LDRH_IMM = 0x005000b0,
INSN_LDRH_REG = 0x001000b0,
INSN_LDRSH_IMM = 0x005000f0,
INSN_LDRSH_REG = 0x001000f0,
INSN_STRH_IMM = 0x004000b0,
INSN_STRH_REG = 0x000000b0,
INSN_LDRB_IMM = 0x04500000,
INSN_LDRB_REG = 0x06500000,
INSN_LDRSB_IMM = 0x005000d0,
INSN_LDRSB_REG = 0x001000d0,
INSN_STRB_IMM = 0x04400000,
INSN_STRB_REG = 0x06400000,
INSN_LDRD_IMM = 0x004000d0,
INSN_LDRD_REG = 0x000000d0,
INSN_STRD_IMM = 0x004000f0,
INSN_STRD_REG = 0x000000f0,
} ARMInsn;
#define SHIFT_IMM_LSL(im) (((im) << 7) | 0x00)
#define SHIFT_IMM_LSR(im) (((im) << 7) | 0x20)
#define SHIFT_IMM_ASR(im) (((im) << 7) | 0x40)
#define SHIFT_IMM_ROR(im) (((im) << 7) | 0x60)
#define SHIFT_REG_LSL(rs) (((rs) << 8) | 0x10)
#define SHIFT_REG_LSR(rs) (((rs) << 8) | 0x30)
#define SHIFT_REG_ASR(rs) (((rs) << 8) | 0x50)
#define SHIFT_REG_ROR(rs) (((rs) << 8) | 0x70)
enum arm_cond_code_e {
COND_EQ = 0x0,
COND_NE = 0x1,
COND_CS = 0x2, /* Unsigned greater or equal */
COND_CC = 0x3, /* Unsigned less than */
COND_MI = 0x4, /* Negative */
COND_PL = 0x5, /* Zero or greater */
COND_VS = 0x6, /* Overflow */
COND_VC = 0x7, /* No overflow */
COND_HI = 0x8, /* Unsigned greater than */
COND_LS = 0x9, /* Unsigned less or equal */
COND_GE = 0xa,
COND_LT = 0xb,
COND_GT = 0xc,
COND_LE = 0xd,
COND_AL = 0xe,
};
static const uint8_t tcg_cond_to_arm_cond[] = {
[TCG_COND_EQ] = COND_EQ,
[TCG_COND_NE] = COND_NE,
[TCG_COND_LT] = COND_LT,
[TCG_COND_GE] = COND_GE,
[TCG_COND_LE] = COND_LE,
[TCG_COND_GT] = COND_GT,
/* unsigned */
[TCG_COND_LTU] = COND_CC,
[TCG_COND_GEU] = COND_CS,
[TCG_COND_LEU] = COND_LS,
[TCG_COND_GTU] = COND_HI,
};
static inline void tcg_out_bx(TCGContext *s, int cond, int rn)
{
tcg_out32(s, (cond << 28) | 0x012fff10 | rn);
}
static inline void tcg_out_b(TCGContext *s, int cond, int32_t offset)
{
tcg_out32(s, (cond << 28) | 0x0a000000 |
(((offset - 8) >> 2) & 0x00ffffff));
}
static inline void tcg_out_b_noaddr(TCGContext *s, int cond)
{
/* We pay attention here to not modify the branch target by masking
the corresponding bytes. This ensure that caches and memory are
kept coherent during retranslation. */
tcg_out32(s, deposit32(*s->code_ptr, 24, 8, (cond << 4) | 0x0a));
}
static inline void tcg_out_bl_noaddr(TCGContext *s, int cond)
{
/* We pay attention here to not modify the branch target by masking
the corresponding bytes. This ensure that caches and memory are
kept coherent during retranslation. */
tcg_out32(s, deposit32(*s->code_ptr, 24, 8, (cond << 4) | 0x0b));
}
static inline void tcg_out_bl(TCGContext *s, int cond, int32_t offset)
{
tcg_out32(s, (cond << 28) | 0x0b000000 |
(((offset - 8) >> 2) & 0x00ffffff));
}
static inline void tcg_out_blx(TCGContext *s, int cond, int rn)
{
tcg_out32(s, (cond << 28) | 0x012fff30 | rn);
}
static inline void tcg_out_blx_imm(TCGContext *s, int32_t offset)
{
tcg_out32(s, 0xfa000000 | ((offset & 2) << 23) |
(((offset - 8) >> 2) & 0x00ffffff));
}
static inline void tcg_out_dat_reg(TCGContext *s,
int cond, int opc, int rd, int rn, int rm, int shift)
{
tcg_out32(s, (cond << 28) | (0 << 25) | opc |
(rn << 16) | (rd << 12) | shift | rm);
}
static inline void tcg_out_nop(TCGContext *s)
{
if (use_armv7_instructions) {
/* Architected nop introduced in v6k. */
/* ??? This is an MSR (imm) 0,0,0 insn. Anyone know if this
also Just So Happened to do nothing on pre-v6k so that we
don't need to conditionalize it? */
tcg_out32(s, 0xe320f000);
} else {
/* Prior to that the assembler uses mov r0, r0. */
tcg_out_dat_reg(s, COND_AL, ARITH_MOV, 0, 0, 0, SHIFT_IMM_LSL(0));
}
}
static inline void tcg_out_mov_reg(TCGContext *s, int cond, int rd, int rm)
{
/* Simple reg-reg move, optimising out the 'do nothing' case */
if (rd != rm) {
tcg_out_dat_reg(s, cond, ARITH_MOV, rd, 0, rm, SHIFT_IMM_LSL(0));
}
}
static inline void tcg_out_dat_imm(TCGContext *s,
int cond, int opc, int rd, int rn, int im)
{
tcg_out32(s, (cond << 28) | (1 << 25) | opc |
(rn << 16) | (rd << 12) | im);
}
static void tcg_out_movi32(TCGContext *s, int cond, int rd, uint32_t arg)
{
int rot, opc, rn;
/* For armv7, make sure not to use movw+movt when mov/mvn would do.
Speed things up by only checking when movt would be required.
Prior to armv7, have one go at fully rotated immediates before
doing the decomposition thing below. */
if (!use_armv7_instructions || (arg & 0xffff0000)) {
rot = encode_imm(arg);
if (rot >= 0) {
tcg_out_dat_imm(s, cond, ARITH_MOV, rd, 0,
rotl(arg, rot) | (rot << 7));
return;
}
rot = encode_imm(~arg);
if (rot >= 0) {
tcg_out_dat_imm(s, cond, ARITH_MVN, rd, 0,
rotl(~arg, rot) | (rot << 7));
return;
}
}
/* Use movw + movt. */
if (use_armv7_instructions) {
/* movw */
tcg_out32(s, (cond << 28) | 0x03000000 | (rd << 12)
| ((arg << 4) & 0x000f0000) | (arg & 0xfff));
if (arg & 0xffff0000) {
/* movt */
tcg_out32(s, (cond << 28) | 0x03400000 | (rd << 12)
| ((arg >> 12) & 0x000f0000) | ((arg >> 16) & 0xfff));
}
return;
}
/* TODO: This is very suboptimal, we can easily have a constant
pool somewhere after all the instructions. */
opc = ARITH_MOV;
rn = 0;
/* If we have lots of leading 1's, we can shorten the sequence by
beginning with mvn and then clearing higher bits with eor. */
if (clz32(~arg) > clz32(arg)) {
opc = ARITH_MVN, arg = ~arg;
}
do {
int i = ctz32(arg) & ~1;
rot = ((32 - i) << 7) & 0xf00;
tcg_out_dat_imm(s, cond, opc, rd, rn, ((arg >> i) & 0xff) | rot);
arg &= ~(0xff << i);
opc = ARITH_EOR;
rn = rd;
} while (arg);
}
static inline void tcg_out_dat_rI(TCGContext *s, int cond, int opc, TCGArg dst,
TCGArg lhs, TCGArg rhs, int rhs_is_const)
{
/* Emit either the reg,imm or reg,reg form of a data-processing insn.
* rhs must satisfy the "rI" constraint.
*/
if (rhs_is_const) {
int rot = encode_imm(rhs);
assert(rot >= 0);
tcg_out_dat_imm(s, cond, opc, dst, lhs, rotl(rhs, rot) | (rot << 7));
} else {
tcg_out_dat_reg(s, cond, opc, dst, lhs, rhs, SHIFT_IMM_LSL(0));
}
}
static void tcg_out_dat_rIK(TCGContext *s, int cond, int opc, int opinv,
TCGReg dst, TCGReg lhs, TCGArg rhs,
bool rhs_is_const)
{
/* Emit either the reg,imm or reg,reg form of a data-processing insn.
* rhs must satisfy the "rIK" constraint.
*/
if (rhs_is_const) {
int rot = encode_imm(rhs);
if (rot < 0) {
rhs = ~rhs;
rot = encode_imm(rhs);
assert(rot >= 0);
opc = opinv;
}
tcg_out_dat_imm(s, cond, opc, dst, lhs, rotl(rhs, rot) | (rot << 7));
} else {
tcg_out_dat_reg(s, cond, opc, dst, lhs, rhs, SHIFT_IMM_LSL(0));
}
}
static void tcg_out_dat_rIN(TCGContext *s, int cond, int opc, int opneg,
TCGArg dst, TCGArg lhs, TCGArg rhs,
bool rhs_is_const)
{
/* Emit either the reg,imm or reg,reg form of a data-processing insn.
* rhs must satisfy the "rIN" constraint.
*/
if (rhs_is_const) {
int rot = encode_imm(rhs);
if (rot < 0) {
rhs = -rhs;
rot = encode_imm(rhs);
assert(rot >= 0);
opc = opneg;
}
tcg_out_dat_imm(s, cond, opc, dst, lhs, rotl(rhs, rot) | (rot << 7));
} else {
tcg_out_dat_reg(s, cond, opc, dst, lhs, rhs, SHIFT_IMM_LSL(0));
}
}
static inline void tcg_out_mul32(TCGContext *s, int cond, TCGReg rd,
TCGReg rn, TCGReg rm)
{
/* if ArchVersion() < 6 && d == n then UNPREDICTABLE; */
if (!use_armv6_instructions && rd == rn) {
if (rd == rm) {
/* rd == rn == rm; copy an input to tmp first. */
tcg_out_mov_reg(s, cond, TCG_REG_TMP, rn);
rm = rn = TCG_REG_TMP;
} else {
rn = rm;
rm = rd;
}
}
/* mul */
tcg_out32(s, (cond << 28) | 0x90 | (rd << 16) | (rm << 8) | rn);
}
static inline void tcg_out_umull32(TCGContext *s, int cond, TCGReg rd0,
TCGReg rd1, TCGReg rn, TCGReg rm)
{
/* if ArchVersion() < 6 && (dHi == n || dLo == n) then UNPREDICTABLE; */
if (!use_armv6_instructions && (rd0 == rn || rd1 == rn)) {
if (rd0 == rm || rd1 == rm) {
tcg_out_mov_reg(s, cond, TCG_REG_TMP, rn);
rn = TCG_REG_TMP;
} else {
TCGReg t = rn;
rn = rm;
rm = t;
}
}
/* umull */
tcg_out32(s, (cond << 28) | 0x00800090 |
(rd1 << 16) | (rd0 << 12) | (rm << 8) | rn);
}
static inline void tcg_out_smull32(TCGContext *s, int cond, TCGReg rd0,
TCGReg rd1, TCGReg rn, TCGReg rm)
{
/* if ArchVersion() < 6 && (dHi == n || dLo == n) then UNPREDICTABLE; */
if (!use_armv6_instructions && (rd0 == rn || rd1 == rn)) {
if (rd0 == rm || rd1 == rm) {
tcg_out_mov_reg(s, cond, TCG_REG_TMP, rn);
rn = TCG_REG_TMP;
} else {
TCGReg t = rn;
rn = rm;
rm = t;
}
}
/* smull */
tcg_out32(s, (cond << 28) | 0x00c00090 |
(rd1 << 16) | (rd0 << 12) | (rm << 8) | rn);
}
static inline void tcg_out_sdiv(TCGContext *s, int cond, int rd, int rn, int rm)
{
tcg_out32(s, 0x0710f010 | (cond << 28) | (rd << 16) | rn | (rm << 8));
}
static inline void tcg_out_udiv(TCGContext *s, int cond, int rd, int rn, int rm)
{
tcg_out32(s, 0x0730f010 | (cond << 28) | (rd << 16) | rn | (rm << 8));
}
static inline void tcg_out_ext8s(TCGContext *s, int cond,
int rd, int rn)
{
if (use_armv6_instructions) {
/* sxtb */
tcg_out32(s, 0x06af0070 | (cond << 28) | (rd << 12) | rn);
} else {
tcg_out_dat_reg(s, cond, ARITH_MOV,
rd, 0, rn, SHIFT_IMM_LSL(24));
tcg_out_dat_reg(s, cond, ARITH_MOV,
rd, 0, rd, SHIFT_IMM_ASR(24));
}
}
static inline void tcg_out_ext8u(TCGContext *s, int cond,
int rd, int rn)
{
tcg_out_dat_imm(s, cond, ARITH_AND, rd, rn, 0xff);
}
static inline void tcg_out_ext16s(TCGContext *s, int cond,
int rd, int rn)
{
if (use_armv6_instructions) {
/* sxth */
tcg_out32(s, 0x06bf0070 | (cond << 28) | (rd << 12) | rn);
} else {
tcg_out_dat_reg(s, cond, ARITH_MOV,
rd, 0, rn, SHIFT_IMM_LSL(16));
tcg_out_dat_reg(s, cond, ARITH_MOV,
rd, 0, rd, SHIFT_IMM_ASR(16));
}
}
static inline void tcg_out_ext16u(TCGContext *s, int cond,
int rd, int rn)
{
if (use_armv6_instructions) {
/* uxth */
tcg_out32(s, 0x06ff0070 | (cond << 28) | (rd << 12) | rn);
} else {
tcg_out_dat_reg(s, cond, ARITH_MOV,
rd, 0, rn, SHIFT_IMM_LSL(16));
tcg_out_dat_reg(s, cond, ARITH_MOV,
rd, 0, rd, SHIFT_IMM_LSR(16));
}
}
static inline void tcg_out_bswap16s(TCGContext *s, int cond, int rd, int rn)
{
if (use_armv6_instructions) {
/* revsh */
tcg_out32(s, 0x06ff0fb0 | (cond << 28) | (rd << 12) | rn);
} else {
tcg_out_dat_reg(s, cond, ARITH_MOV,
TCG_REG_TMP, 0, rn, SHIFT_IMM_LSL(24));
tcg_out_dat_reg(s, cond, ARITH_MOV,
TCG_REG_TMP, 0, TCG_REG_TMP, SHIFT_IMM_ASR(16));
tcg_out_dat_reg(s, cond, ARITH_ORR,
rd, TCG_REG_TMP, rn, SHIFT_IMM_LSR(8));
}
}
static inline void tcg_out_bswap16(TCGContext *s, int cond, int rd, int rn)
{
if (use_armv6_instructions) {
/* rev16 */
tcg_out32(s, 0x06bf0fb0 | (cond << 28) | (rd << 12) | rn);
} else {
tcg_out_dat_reg(s, cond, ARITH_MOV,
TCG_REG_TMP, 0, rn, SHIFT_IMM_LSL(24));
tcg_out_dat_reg(s, cond, ARITH_MOV,
TCG_REG_TMP, 0, TCG_REG_TMP, SHIFT_IMM_LSR(16));
tcg_out_dat_reg(s, cond, ARITH_ORR,
rd, TCG_REG_TMP, rn, SHIFT_IMM_LSR(8));
}
}
/* swap the two low bytes assuming that the two high input bytes and the
two high output bit can hold any value. */
static inline void tcg_out_bswap16st(TCGContext *s, int cond, int rd, int rn)
{
if (use_armv6_instructions) {
/* rev16 */
tcg_out32(s, 0x06bf0fb0 | (cond << 28) | (rd << 12) | rn);
} else {
tcg_out_dat_reg(s, cond, ARITH_MOV,
TCG_REG_TMP, 0, rn, SHIFT_IMM_LSR(8));
tcg_out_dat_imm(s, cond, ARITH_AND, TCG_REG_TMP, TCG_REG_TMP, 0xff);
tcg_out_dat_reg(s, cond, ARITH_ORR,
rd, TCG_REG_TMP, rn, SHIFT_IMM_LSL(8));
}
}
static inline void tcg_out_bswap32(TCGContext *s, int cond, int rd, int rn)
{
if (use_armv6_instructions) {
/* rev */
tcg_out32(s, 0x06bf0f30 | (cond << 28) | (rd << 12) | rn);
} else {
tcg_out_dat_reg(s, cond, ARITH_EOR,
TCG_REG_TMP, rn, rn, SHIFT_IMM_ROR(16));
tcg_out_dat_imm(s, cond, ARITH_BIC,
TCG_REG_TMP, TCG_REG_TMP, 0xff | 0x800);
tcg_out_dat_reg(s, cond, ARITH_MOV,
rd, 0, rn, SHIFT_IMM_ROR(8));
tcg_out_dat_reg(s, cond, ARITH_EOR,
rd, rd, TCG_REG_TMP, SHIFT_IMM_LSR(8));
}
}
bool tcg_target_deposit_valid(int ofs, int len)
{
/* ??? Without bfi, we could improve over generic code by combining
the right-shift from a non-zero ofs with the orr. We do run into
problems when rd == rs, and the mask generated from ofs+len doesn't
fit into an immediate. We would have to be careful not to pessimize
wrt the optimizations performed on the expanded code. */
return use_armv7_instructions;
}
static inline void tcg_out_deposit(TCGContext *s, int cond, TCGReg rd,
TCGArg a1, int ofs, int len, bool const_a1)
{
if (const_a1) {
/* bfi becomes bfc with rn == 15. */
a1 = 15;
}
/* bfi/bfc */
tcg_out32(s, 0x07c00010 | (cond << 28) | (rd << 12) | a1
| (ofs << 7) | ((ofs + len - 1) << 16));
}
/* Note that this routine is used for both LDR and LDRH formats, so we do
not wish to include an immediate shift at this point. */
static void tcg_out_memop_r(TCGContext *s, int cond, ARMInsn opc, TCGReg rt,
TCGReg rn, TCGReg rm, bool u, bool p, bool w)
{
tcg_out32(s, (cond << 28) | opc | (u << 23) | (p << 24)
| (w << 21) | (rn << 16) | (rt << 12) | rm);
}
static void tcg_out_memop_8(TCGContext *s, int cond, ARMInsn opc, TCGReg rt,
TCGReg rn, int imm8, bool p, bool w)
{
bool u = 1;
if (imm8 < 0) {
imm8 = -imm8;
u = 0;
}
tcg_out32(s, (cond << 28) | opc | (u << 23) | (p << 24) | (w << 21) |
(rn << 16) | (rt << 12) | ((imm8 & 0xf0) << 4) | (imm8 & 0xf));
}
static void tcg_out_memop_12(TCGContext *s, int cond, ARMInsn opc, TCGReg rt,
TCGReg rn, int imm12, bool p, bool w)
{
bool u = 1;
if (imm12 < 0) {
imm12 = -imm12;
u = 0;
}
tcg_out32(s, (cond << 28) | opc | (u << 23) | (p << 24) | (w << 21) |
(rn << 16) | (rt << 12) | imm12);
}
static inline void tcg_out_ld32_12(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, int imm12)
{
tcg_out_memop_12(s, cond, INSN_LDR_IMM, rt, rn, imm12, 1, 0);
}
static inline void tcg_out_st32_12(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, int imm12)
{
tcg_out_memop_12(s, cond, INSN_STR_IMM, rt, rn, imm12, 1, 0);
}
static inline void tcg_out_ld32_r(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, TCGReg rm)
{
tcg_out_memop_r(s, cond, INSN_LDR_REG, rt, rn, rm, 1, 1, 0);
}
static inline void tcg_out_st32_r(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, TCGReg rm)
{
tcg_out_memop_r(s, cond, INSN_STR_REG, rt, rn, rm, 1, 1, 0);
}
static inline void tcg_out_ldrd_8(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, int imm8)
{
tcg_out_memop_8(s, cond, INSN_LDRD_IMM, rt, rn, imm8, 1, 0);
}
static inline void tcg_out_ldrd_r(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, TCGReg rm)
{
tcg_out_memop_r(s, cond, INSN_LDRD_REG, rt, rn, rm, 1, 1, 0);
}
static inline void tcg_out_strd_8(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, int imm8)
{
tcg_out_memop_8(s, cond, INSN_STRD_IMM, rt, rn, imm8, 1, 0);
}
static inline void tcg_out_strd_r(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, TCGReg rm)
{
tcg_out_memop_r(s, cond, INSN_STRD_REG, rt, rn, rm, 1, 1, 0);
}
/* Register pre-increment with base writeback. */
static inline void tcg_out_ld32_rwb(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, TCGReg rm)
{
tcg_out_memop_r(s, cond, INSN_LDR_REG, rt, rn, rm, 1, 1, 1);
}
static inline void tcg_out_st32_rwb(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, TCGReg rm)
{
tcg_out_memop_r(s, cond, INSN_STR_REG, rt, rn, rm, 1, 1, 1);
}
static inline void tcg_out_ld16u_8(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, int imm8)
{
tcg_out_memop_8(s, cond, INSN_LDRH_IMM, rt, rn, imm8, 1, 0);
}
static inline void tcg_out_st16_8(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, int imm8)
{
tcg_out_memop_8(s, cond, INSN_STRH_IMM, rt, rn, imm8, 1, 0);
}
static inline void tcg_out_ld16u_r(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, TCGReg rm)
{
tcg_out_memop_r(s, cond, INSN_LDRH_REG, rt, rn, rm, 1, 1, 0);
}
static inline void tcg_out_st16_r(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, TCGReg rm)
{
tcg_out_memop_r(s, cond, INSN_STRH_REG, rt, rn, rm, 1, 1, 0);
}
static inline void tcg_out_ld16s_8(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, int imm8)
{
tcg_out_memop_8(s, cond, INSN_LDRSH_IMM, rt, rn, imm8, 1, 0);
}
static inline void tcg_out_ld16s_r(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, TCGReg rm)
{
tcg_out_memop_r(s, cond, INSN_LDRSH_REG, rt, rn, rm, 1, 1, 0);
}
static inline void tcg_out_ld8_12(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, int imm12)
{
tcg_out_memop_12(s, cond, INSN_LDRB_IMM, rt, rn, imm12, 1, 0);
}
static inline void tcg_out_st8_12(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, int imm12)
{
tcg_out_memop_12(s, cond, INSN_STRB_IMM, rt, rn, imm12, 1, 0);
}
static inline void tcg_out_ld8_r(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, TCGReg rm)
{
tcg_out_memop_r(s, cond, INSN_LDRB_REG, rt, rn, rm, 1, 1, 0);
}
static inline void tcg_out_st8_r(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, TCGReg rm)
{
tcg_out_memop_r(s, cond, INSN_STRB_REG, rt, rn, rm, 1, 1, 0);
}
static inline void tcg_out_ld8s_8(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, int imm8)
{
tcg_out_memop_8(s, cond, INSN_LDRSB_IMM, rt, rn, imm8, 1, 0);
}
static inline void tcg_out_ld8s_r(TCGContext *s, int cond, TCGReg rt,
TCGReg rn, TCGReg rm)
{
tcg_out_memop_r(s, cond, INSN_LDRSB_REG, rt, rn, rm, 1, 1, 0);
}
static inline void tcg_out_ld32u(TCGContext *s, int cond,
int rd, int rn, int32_t offset)
{
if (offset > 0xfff || offset < -0xfff) {
tcg_out_movi32(s, cond, TCG_REG_TMP, offset);
tcg_out_ld32_r(s, cond, rd, rn, TCG_REG_TMP);
} else
tcg_out_ld32_12(s, cond, rd, rn, offset);
}
static inline void tcg_out_st32(TCGContext *s, int cond,
int rd, int rn, int32_t offset)
{
if (offset > 0xfff || offset < -0xfff) {
tcg_out_movi32(s, cond, TCG_REG_TMP, offset);
tcg_out_st32_r(s, cond, rd, rn, TCG_REG_TMP);
} else
tcg_out_st32_12(s, cond, rd, rn, offset);
}
static inline void tcg_out_ld16u(TCGContext *s, int cond,
int rd, int rn, int32_t offset)
{
if (offset > 0xff || offset < -0xff) {
tcg_out_movi32(s, cond, TCG_REG_TMP, offset);
tcg_out_ld16u_r(s, cond, rd, rn, TCG_REG_TMP);
} else
tcg_out_ld16u_8(s, cond, rd, rn, offset);
}
static inline void tcg_out_ld16s(TCGContext *s, int cond,
int rd, int rn, int32_t offset)
{
if (offset > 0xff || offset < -0xff) {
tcg_out_movi32(s, cond, TCG_REG_TMP, offset);
tcg_out_ld16s_r(s, cond, rd, rn, TCG_REG_TMP);
} else
tcg_out_ld16s_8(s, cond, rd, rn, offset);
}
static inline void tcg_out_st16(TCGContext *s, int cond,
int rd, int rn, int32_t offset)
{
if (offset > 0xff || offset < -0xff) {
tcg_out_movi32(s, cond, TCG_REG_TMP, offset);
tcg_out_st16_r(s, cond, rd, rn, TCG_REG_TMP);
} else
tcg_out_st16_8(s, cond, rd, rn, offset);
}
static inline void tcg_out_ld8u(TCGContext *s, int cond,
int rd, int rn, int32_t offset)
{
if (offset > 0xfff || offset < -0xfff) {
tcg_out_movi32(s, cond, TCG_REG_TMP, offset);
tcg_out_ld8_r(s, cond, rd, rn, TCG_REG_TMP);
} else
tcg_out_ld8_12(s, cond, rd, rn, offset);
}
static inline void tcg_out_ld8s(TCGContext *s, int cond,
int rd, int rn, int32_t offset)
{
if (offset > 0xff || offset < -0xff) {
tcg_out_movi32(s, cond, TCG_REG_TMP, offset);
tcg_out_ld8s_r(s, cond, rd, rn, TCG_REG_TMP);
} else
tcg_out_ld8s_8(s, cond, rd, rn, offset);
}
static inline void tcg_out_st8(TCGContext *s, int cond,
int rd, int rn, int32_t offset)
{
if (offset > 0xfff || offset < -0xfff) {
tcg_out_movi32(s, cond, TCG_REG_TMP, offset);
tcg_out_st8_r(s, cond, rd, rn, TCG_REG_TMP);
} else
tcg_out_st8_12(s, cond, rd, rn, offset);
}
/* The _goto case is normally between TBs within the same code buffer, and
* with the code buffer limited to 16MB we wouldn't need the long case.
* But we also use it for the tail-call to the qemu_ld/st helpers, which does.
*/
static inline void tcg_out_goto(TCGContext *s, int cond, tcg_insn_unit *addr)
{
intptr_t addri = (intptr_t)addr;
ptrdiff_t disp = tcg_pcrel_diff(s, addr);
if ((addri & 1) == 0 && disp - 8 < 0x01fffffd && disp - 8 > -0x01fffffd) {
tcg_out_b(s, cond, disp);
return;
}
tcg_out_movi32(s, cond, TCG_REG_TMP, addri);
if (use_armv5t_instructions) {
tcg_out_bx(s, cond, TCG_REG_TMP);
} else {
if (addri & 1) {
tcg_abort();
}
tcg_out_mov_reg(s, cond, TCG_REG_PC, TCG_REG_TMP);
}
}
/* The call case is mostly used for helpers - so it's not unreasonable
* for them to be beyond branch range */
static void tcg_out_call(TCGContext *s, tcg_insn_unit *addr)
{
intptr_t addri = (intptr_t)addr;
ptrdiff_t disp = tcg_pcrel_diff(s, addr);
if (disp - 8 < 0x02000000 && disp - 8 >= -0x02000000) {
if (addri & 1) {
/* Use BLX if the target is in Thumb mode */
if (!use_armv5t_instructions) {
tcg_abort();
}
tcg_out_blx_imm(s, disp);
} else {
tcg_out_bl(s, COND_AL, disp);
}
} else if (use_armv7_instructions) {
tcg_out_movi32(s, COND_AL, TCG_REG_TMP, addri);
tcg_out_blx(s, COND_AL, TCG_REG_TMP);
} else {
tcg_out_dat_imm(s, COND_AL, ARITH_ADD, TCG_REG_R14, TCG_REG_PC, 4);
tcg_out_ld32_12(s, COND_AL, TCG_REG_PC, TCG_REG_PC, -4);
tcg_out32(s, addri);
}
}
static inline void tcg_out_goto_label(TCGContext *s, int cond, int label_index)
{
TCGLabel *l = &s->labels[label_index];
if (l->has_value) {
tcg_out_goto(s, cond, l->u.value_ptr);
} else {
tcg_out_reloc(s, s->code_ptr, R_ARM_PC24, label_index, 0);
tcg_out_b_noaddr(s, cond);
}
}
#ifdef CONFIG_SOFTMMU
/* helper signature: helper_ret_ld_mmu(CPUState *env, target_ulong addr,
* int mmu_idx, uintptr_t ra)
*/
static void * const qemu_ld_helpers[16] = {
[MO_UB] = helper_ret_ldub_mmu,
[MO_SB] = helper_ret_ldsb_mmu,
[MO_LEUW] = helper_le_lduw_mmu,
[MO_LEUL] = helper_le_ldul_mmu,
[MO_LEQ] = helper_le_ldq_mmu,
[MO_LESW] = helper_le_ldsw_mmu,
[MO_LESL] = helper_le_ldul_mmu,
[MO_BEUW] = helper_be_lduw_mmu,
[MO_BEUL] = helper_be_ldul_mmu,
[MO_BEQ] = helper_be_ldq_mmu,
[MO_BESW] = helper_be_ldsw_mmu,
[MO_BESL] = helper_be_ldul_mmu,
};
/* helper signature: helper_ret_st_mmu(CPUState *env, target_ulong addr,
* uintxx_t val, int mmu_idx, uintptr_t ra)
*/
static void * const qemu_st_helpers[16] = {
[MO_UB] = helper_ret_stb_mmu,
[MO_LEUW] = helper_le_stw_mmu,
[MO_LEUL] = helper_le_stl_mmu,
[MO_LEQ] = helper_le_stq_mmu,
[MO_BEUW] = helper_be_stw_mmu,
[MO_BEUL] = helper_be_stl_mmu,
[MO_BEQ] = helper_be_stq_mmu,
};
/* Helper routines for marshalling helper function arguments into
* the correct registers and stack.
* argreg is where we want to put this argument, arg is the argument itself.
* Return value is the updated argreg ready for the next call.
* Note that argreg 0..3 is real registers, 4+ on stack.
*
* We provide routines for arguments which are: immediate, 32 bit
* value in register, 16 and 8 bit values in register (which must be zero
* extended before use) and 64 bit value in a lo:hi register pair.
*/
#define DEFINE_TCG_OUT_ARG(NAME, ARGTYPE, MOV_ARG, EXT_ARG) \
static TCGReg NAME(TCGContext *s, TCGReg argreg, ARGTYPE arg) \
{ \
if (argreg < 4) { \
MOV_ARG(s, COND_AL, argreg, arg); \
} else { \
int ofs = (argreg - 4) * 4; \
EXT_ARG; \
assert(ofs + 4 <= TCG_STATIC_CALL_ARGS_SIZE); \
tcg_out_st32_12(s, COND_AL, arg, TCG_REG_CALL_STACK, ofs); \
} \
return argreg + 1; \
}
DEFINE_TCG_OUT_ARG(tcg_out_arg_imm32, uint32_t, tcg_out_movi32,
(tcg_out_movi32(s, COND_AL, TCG_REG_TMP, arg), arg = TCG_REG_TMP))
DEFINE_TCG_OUT_ARG(tcg_out_arg_reg8, TCGReg, tcg_out_ext8u,
(tcg_out_ext8u(s, COND_AL, TCG_REG_TMP, arg), arg = TCG_REG_TMP))
DEFINE_TCG_OUT_ARG(tcg_out_arg_reg16, TCGReg, tcg_out_ext16u,
(tcg_out_ext16u(s, COND_AL, TCG_REG_TMP, arg), arg = TCG_REG_TMP))
DEFINE_TCG_OUT_ARG(tcg_out_arg_reg32, TCGReg, tcg_out_mov_reg, )
static TCGReg tcg_out_arg_reg64(TCGContext *s, TCGReg argreg,
TCGReg arglo, TCGReg arghi)
{
/* 64 bit arguments must go in even/odd register pairs
* and in 8-aligned stack slots.
*/
if (argreg & 1) {
argreg++;
}
if (use_armv6_instructions && argreg >= 4
&& (arglo & 1) == 0 && arghi == arglo + 1) {
tcg_out_strd_8(s, COND_AL, arglo,
TCG_REG_CALL_STACK, (argreg - 4) * 4);
return argreg + 2;
} else {
argreg = tcg_out_arg_reg32(s, argreg, arglo);
argreg = tcg_out_arg_reg32(s, argreg, arghi);
return argreg;
}
}
#define TLB_SHIFT (CPU_TLB_ENTRY_BITS + CPU_TLB_BITS)
/* We're expecting to use an 8-bit immediate and to mask. */
QEMU_BUILD_BUG_ON(CPU_TLB_BITS > 8);
/* We're expecting to use an 8-bit immediate add + 8-bit ldrd offset.
Using the offset of the second entry in the last tlb table ensures
that we can index all of the elements of the first entry. */
QEMU_BUILD_BUG_ON(offsetof(CPUArchState, tlb_table[NB_MMU_MODES - 1][1])
> 0xffff);
/* Load and compare a TLB entry, leaving the flags set. Returns the register
containing the addend of the tlb entry. Clobbers R0, R1, R2, TMP. */
static TCGReg tcg_out_tlb_read(TCGContext *s, TCGReg addrlo, TCGReg addrhi,
TCGMemOp s_bits, int mem_index, bool is_load)
{
TCGReg base = TCG_AREG0;
int cmp_off =
(is_load
? offsetof(CPUArchState, tlb_table[mem_index][0].addr_read)
: offsetof(CPUArchState, tlb_table[mem_index][0].addr_write));
int add_off = offsetof(CPUArchState, tlb_table[mem_index][0].addend);
/* Should generate something like the following:
* shr tmp, addrlo, #TARGET_PAGE_BITS (1)
* add r2, env, #high
* and r0, tmp, #(CPU_TLB_SIZE - 1) (2)
* add r2, r2, r0, lsl #CPU_TLB_ENTRY_BITS (3)
* ldr r0, [r2, #cmp] (4)
* tst addrlo, #s_mask
* ldr r2, [r2, #add] (5)
* cmpeq r0, tmp, lsl #TARGET_PAGE_BITS
*/
tcg_out_dat_reg(s, COND_AL, ARITH_MOV, TCG_REG_TMP,
0, addrlo, SHIFT_IMM_LSR(TARGET_PAGE_BITS));
/* We checked that the offset is contained within 16 bits above. */
if (add_off > 0xfff || (use_armv6_instructions && cmp_off > 0xff)) {
tcg_out_dat_imm(s, COND_AL, ARITH_ADD, TCG_REG_R2, base,
(24 << 7) | (cmp_off >> 8));
base = TCG_REG_R2;
add_off -= cmp_off & 0xff00;
cmp_off &= 0xff;
}
tcg_out_dat_imm(s, COND_AL, ARITH_AND,
TCG_REG_R0, TCG_REG_TMP, CPU_TLB_SIZE - 1);
tcg_out_dat_reg(s, COND_AL, ARITH_ADD, TCG_REG_R2, base,
TCG_REG_R0, SHIFT_IMM_LSL(CPU_TLB_ENTRY_BITS));
/* Load the tlb comparator. Use ldrd if needed and available,
but due to how the pointer needs setting up, ldm isn't useful.
Base arm5 doesn't have ldrd, but armv5te does. */
if (use_armv6_instructions && TARGET_LONG_BITS == 64) {
tcg_out_ldrd_8(s, COND_AL, TCG_REG_R0, TCG_REG_R2, cmp_off);
} else {
tcg_out_ld32_12(s, COND_AL, TCG_REG_R0, TCG_REG_R2, cmp_off);
if (TARGET_LONG_BITS == 64) {
tcg_out_ld32_12(s, COND_AL, TCG_REG_R1, TCG_REG_R2, cmp_off + 4);
}
}
/* Check alignment. */
if (s_bits) {
tcg_out_dat_imm(s, COND_AL, ARITH_TST,
0, addrlo, (1 << s_bits) - 1);
}
/* Load the tlb addend. */
tcg_out_ld32_12(s, COND_AL, TCG_REG_R2, TCG_REG_R2, add_off);
tcg_out_dat_reg(s, (s_bits ? COND_EQ : COND_AL), ARITH_CMP, 0,
TCG_REG_R0, TCG_REG_TMP, SHIFT_IMM_LSL(TARGET_PAGE_BITS));
if (TARGET_LONG_BITS == 64) {
tcg_out_dat_reg(s, COND_EQ, ARITH_CMP, 0,
TCG_REG_R1, addrhi, SHIFT_IMM_LSL(0));
}
return TCG_REG_R2;
}
/* Record the context of a call to the out of line helper code for the slow
path for a load or store, so that we can later generate the correct
helper code. */
static void add_qemu_ldst_label(TCGContext *s, bool is_ld, TCGMemOp opc,
TCGReg datalo, TCGReg datahi, TCGReg addrlo,
TCGReg addrhi, int mem_index,
tcg_insn_unit *raddr, tcg_insn_unit *label_ptr)
{
TCGLabelQemuLdst *label = new_ldst_label(s);
label->is_ld = is_ld;
label->opc = opc;
label->datalo_reg = datalo;
label->datahi_reg = datahi;
label->addrlo_reg = addrlo;
label->addrhi_reg = addrhi;
label->mem_index = mem_index;
label->raddr = raddr;
label->label_ptr[0] = label_ptr;
}
static void tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
{
TCGReg argreg, datalo, datahi;
TCGMemOp opc = lb->opc;
void *func;
reloc_pc24(lb->label_ptr[0], s->code_ptr);
argreg = tcg_out_arg_reg32(s, TCG_REG_R0, TCG_AREG0);
if (TARGET_LONG_BITS == 64) {
argreg = tcg_out_arg_reg64(s, argreg, lb->addrlo_reg, lb->addrhi_reg);
} else {
argreg = tcg_out_arg_reg32(s, argreg, lb->addrlo_reg);
}
argreg = tcg_out_arg_imm32(s, argreg, lb->mem_index);
argreg = tcg_out_arg_reg32(s, argreg, TCG_REG_R14);
/* For armv6 we can use the canonical unsigned helpers and minimize
icache usage. For pre-armv6, use the signed helpers since we do
not have a single insn sign-extend. */
if (use_armv6_instructions) {
func = qemu_ld_helpers[opc & ~MO_SIGN];
} else {
func = qemu_ld_helpers[opc];
if (opc & MO_SIGN) {
opc = MO_UL;
}
}
tcg_out_call(s, func);
datalo = lb->datalo_reg;
datahi = lb->datahi_reg;
switch (opc & MO_SSIZE) {
case MO_SB:
tcg_out_ext8s(s, COND_AL, datalo, TCG_REG_R0);
break;
case MO_SW:
tcg_out_ext16s(s, COND_AL, datalo, TCG_REG_R0);
break;
default:
tcg_out_mov_reg(s, COND_AL, datalo, TCG_REG_R0);
break;
case MO_Q:
if (datalo != TCG_REG_R1) {
tcg_out_mov_reg(s, COND_AL, datalo, TCG_REG_R0);
tcg_out_mov_reg(s, COND_AL, datahi, TCG_REG_R1);
} else if (datahi != TCG_REG_R0) {
tcg_out_mov_reg(s, COND_AL, datahi, TCG_REG_R1);
tcg_out_mov_reg(s, COND_AL, datalo, TCG_REG_R0);
} else {
tcg_out_mov_reg(s, COND_AL, TCG_REG_TMP, TCG_REG_R0);
tcg_out_mov_reg(s, COND_AL, datahi, TCG_REG_R1);
tcg_out_mov_reg(s, COND_AL, datalo, TCG_REG_TMP);
}
break;
}
tcg_out_goto(s, COND_AL, lb->raddr);
}
static void tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
{
TCGReg argreg, datalo, datahi;
TCGMemOp opc = lb->opc;
reloc_pc24(lb->label_ptr[0], s->code_ptr);
argreg = TCG_REG_R0;
argreg = tcg_out_arg_reg32(s, argreg, TCG_AREG0);
if (TARGET_LONG_BITS == 64) {
argreg = tcg_out_arg_reg64(s, argreg, lb->addrlo_reg, lb->addrhi_reg);
} else {
argreg = tcg_out_arg_reg32(s, argreg, lb->addrlo_reg);
}
datalo = lb->datalo_reg;
datahi = lb->datahi_reg;
switch (opc & MO_SIZE) {
case MO_8:
argreg = tcg_out_arg_reg8(s, argreg, datalo);
break;
case MO_16:
argreg = tcg_out_arg_reg16(s, argreg, datalo);
break;
case MO_32:
default:
argreg = tcg_out_arg_reg32(s, argreg, datalo);
break;
case MO_64:
argreg = tcg_out_arg_reg64(s, argreg, datalo, datahi);
break;
}
argreg = tcg_out_arg_imm32(s, argreg, lb->mem_index);
argreg = tcg_out_arg_reg32(s, argreg, TCG_REG_R14);
/* Tail-call to the helper, which will return to the fast path. */
tcg_out_goto(s, COND_AL, qemu_st_helpers[opc]);
}
#endif /* SOFTMMU */
static inline void tcg_out_qemu_ld_index(TCGContext *s, TCGMemOp opc,
TCGReg datalo, TCGReg datahi,
TCGReg addrlo, TCGReg addend)
{
TCGMemOp bswap = opc & MO_BSWAP;
switch (opc & MO_SSIZE) {
case MO_UB:
tcg_out_ld8_r(s, COND_AL, datalo, addrlo, addend);
break;
case MO_SB:
tcg_out_ld8s_r(s, COND_AL, datalo, addrlo, addend);
break;
case MO_UW:
tcg_out_ld16u_r(s, COND_AL, datalo, addrlo, addend);
if (bswap) {
tcg_out_bswap16(s, COND_AL, datalo, datalo);
}
break;
case MO_SW:
if (bswap) {
tcg_out_ld16u_r(s, COND_AL, datalo, addrlo, addend);
tcg_out_bswap16s(s, COND_AL, datalo, datalo);
} else {
tcg_out_ld16s_r(s, COND_AL, datalo, addrlo, addend);
}
break;
case MO_UL:
default:
tcg_out_ld32_r(s, COND_AL, datalo, addrlo, addend);
if (bswap) {
tcg_out_bswap32(s, COND_AL, datalo, datalo);
}
break;
case MO_Q:
{
TCGReg dl = (bswap ? datahi : datalo);
TCGReg dh = (bswap ? datalo : datahi);
/* Avoid ldrd for user-only emulation, to handle unaligned. */
if (USING_SOFTMMU && use_armv6_instructions
&& (dl & 1) == 0 && dh == dl + 1) {
tcg_out_ldrd_r(s, COND_AL, dl, addrlo, addend);
} else if (dl != addend) {
tcg_out_ld32_rwb(s, COND_AL, dl, addend, addrlo);
tcg_out_ld32_12(s, COND_AL, dh, addend, 4);
} else {
tcg_out_dat_reg(s, COND_AL, ARITH_ADD, TCG_REG_TMP,
addend, addrlo, SHIFT_IMM_LSL(0));
tcg_out_ld32_12(s, COND_AL, dl, TCG_REG_TMP, 0);
tcg_out_ld32_12(s, COND_AL, dh, TCG_REG_TMP, 4);
}
if (bswap) {
tcg_out_bswap32(s, COND_AL, dl, dl);
tcg_out_bswap32(s, COND_AL, dh, dh);
}
}
break;
}
}
static inline void tcg_out_qemu_ld_direct(TCGContext *s, TCGMemOp opc,
TCGReg datalo, TCGReg datahi,
TCGReg addrlo)
{
TCGMemOp bswap = opc & MO_BSWAP;
switch (opc & MO_SSIZE) {
case MO_UB:
tcg_out_ld8_12(s, COND_AL, datalo, addrlo, 0);
break;
case MO_SB:
tcg_out_ld8s_8(s, COND_AL, datalo, addrlo, 0);
break;
case MO_UW:
tcg_out_ld16u_8(s, COND_AL, datalo, addrlo, 0);
if (bswap) {
tcg_out_bswap16(s, COND_AL, datalo, datalo);
}
break;
case MO_SW:
if (bswap) {
tcg_out_ld16u_8(s, COND_AL, datalo, addrlo, 0);
tcg_out_bswap16s(s, COND_AL, datalo, datalo);
} else {
tcg_out_ld16s_8(s, COND_AL, datalo, addrlo, 0);
}
break;
case MO_UL:
default:
tcg_out_ld32_12(s, COND_AL, datalo, addrlo, 0);
if (bswap) {
tcg_out_bswap32(s, COND_AL, datalo, datalo);
}
break;
case MO_Q:
{
TCGReg dl = (bswap ? datahi : datalo);
TCGReg dh = (bswap ? datalo : datahi);
/* Avoid ldrd for user-only emulation, to handle unaligned. */
if (USING_SOFTMMU && use_armv6_instructions
&& (dl & 1) == 0 && dh == dl + 1) {
tcg_out_ldrd_8(s, COND_AL, dl, addrlo, 0);
} else if (dl == addrlo) {
tcg_out_ld32_12(s, COND_AL, dh, addrlo, bswap ? 0 : 4);
tcg_out_ld32_12(s, COND_AL, dl, addrlo, bswap ? 4 : 0);
} else {
tcg_out_ld32_12(s, COND_AL, dl, addrlo, bswap ? 4 : 0);
tcg_out_ld32_12(s, COND_AL, dh, addrlo, bswap ? 0 : 4);
}
if (bswap) {
tcg_out_bswap32(s, COND_AL, dl, dl);
tcg_out_bswap32(s, COND_AL, dh, dh);
}
}
break;
}
}
static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, bool is64)
{
TCGReg addrlo, datalo, datahi, addrhi __attribute__((unused));
TCGMemOp opc;
#ifdef CONFIG_SOFTMMU
int mem_index;
TCGReg addend;
tcg_insn_unit *label_ptr;
#endif
datalo = *args++;
datahi = (is64 ? *args++ : 0);
addrlo = *args++;
addrhi = (TARGET_LONG_BITS == 64 ? *args++ : 0);
opc = *args++;
#ifdef CONFIG_SOFTMMU
mem_index = *args;
addend = tcg_out_tlb_read(s, addrlo, addrhi, opc & MO_SIZE, mem_index, 1);
/* This a conditional BL only to load a pointer within this opcode into LR
for the slow path. We will not be using the value for a tail call. */
label_ptr = s->code_ptr;
tcg_out_bl_noaddr(s, COND_NE);
tcg_out_qemu_ld_index(s, opc, datalo, datahi, addrlo, addend);
add_qemu_ldst_label(s, true, opc, datalo, datahi, addrlo, addrhi,
mem_index, s->code_ptr, label_ptr);
#else /* !CONFIG_SOFTMMU */
if (GUEST_BASE) {
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP, GUEST_BASE);
tcg_out_qemu_ld_index(s, opc, datalo, datahi, addrlo, TCG_REG_TMP);
} else {
tcg_out_qemu_ld_direct(s, opc, datalo, datahi, addrlo);
}
#endif
}
static inline void tcg_out_qemu_st_index(TCGContext *s, int cond, TCGMemOp opc,
TCGReg datalo, TCGReg datahi,
TCGReg addrlo, TCGReg addend)
{
TCGMemOp bswap = opc & MO_BSWAP;
switch (opc & MO_SIZE) {
case MO_8:
tcg_out_st8_r(s, cond, datalo, addrlo, addend);
break;
case MO_16:
if (bswap) {
tcg_out_bswap16st(s, cond, TCG_REG_R0, datalo);
tcg_out_st16_r(s, cond, TCG_REG_R0, addrlo, addend);
} else {
tcg_out_st16_r(s, cond, datalo, addrlo, addend);
}
break;
case MO_32:
default:
if (bswap) {
tcg_out_bswap32(s, cond, TCG_REG_R0, datalo);
tcg_out_st32_r(s, cond, TCG_REG_R0, addrlo, addend);
} else {
tcg_out_st32_r(s, cond, datalo, addrlo, addend);
}
break;
case MO_64:
/* Avoid strd for user-only emulation, to handle unaligned. */
if (bswap) {
tcg_out_bswap32(s, cond, TCG_REG_R0, datahi);
tcg_out_st32_rwb(s, cond, TCG_REG_R0, addend, addrlo);
tcg_out_bswap32(s, cond, TCG_REG_R0, datalo);
tcg_out_st32_12(s, cond, TCG_REG_R0, addend, 4);
} else if (USING_SOFTMMU && use_armv6_instructions
&& (datalo & 1) == 0 && datahi == datalo + 1) {
tcg_out_strd_r(s, cond, datalo, addrlo, addend);
} else {
tcg_out_st32_rwb(s, cond, datalo, addend, addrlo);
tcg_out_st32_12(s, cond, datahi, addend, 4);
}
break;
}
}
static inline void tcg_out_qemu_st_direct(TCGContext *s, TCGMemOp opc,
TCGReg datalo, TCGReg datahi,
TCGReg addrlo)
{
TCGMemOp bswap = opc & MO_BSWAP;
switch (opc & MO_SIZE) {
case MO_8:
tcg_out_st8_12(s, COND_AL, datalo, addrlo, 0);
break;
case MO_16:
if (bswap) {
tcg_out_bswap16st(s, COND_AL, TCG_REG_R0, datalo);
tcg_out_st16_8(s, COND_AL, TCG_REG_R0, addrlo, 0);
} else {
tcg_out_st16_8(s, COND_AL, datalo, addrlo, 0);
}
break;
case MO_32:
default:
if (bswap) {
tcg_out_bswap32(s, COND_AL, TCG_REG_R0, datalo);
tcg_out_st32_12(s, COND_AL, TCG_REG_R0, addrlo, 0);
} else {
tcg_out_st32_12(s, COND_AL, datalo, addrlo, 0);
}
break;
case MO_64:
/* Avoid strd for user-only emulation, to handle unaligned. */
if (bswap) {
tcg_out_bswap32(s, COND_AL, TCG_REG_R0, datahi);
tcg_out_st32_12(s, COND_AL, TCG_REG_R0, addrlo, 0);
tcg_out_bswap32(s, COND_AL, TCG_REG_R0, datalo);
tcg_out_st32_12(s, COND_AL, TCG_REG_R0, addrlo, 4);
} else if (USING_SOFTMMU && use_armv6_instructions
&& (datalo & 1) == 0 && datahi == datalo + 1) {
tcg_out_strd_8(s, COND_AL, datalo, addrlo, 0);
} else {
tcg_out_st32_12(s, COND_AL, datalo, addrlo, 0);
tcg_out_st32_12(s, COND_AL, datahi, addrlo, 4);
}
break;
}
}
static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is64)
{
TCGReg addrlo, datalo, datahi, addrhi __attribute__((unused));
TCGMemOp opc;
#ifdef CONFIG_SOFTMMU
int mem_index;
TCGReg addend;
tcg_insn_unit *label_ptr;
#endif
datalo = *args++;
datahi = (is64 ? *args++ : 0);
addrlo = *args++;
addrhi = (TARGET_LONG_BITS == 64 ? *args++ : 0);
opc = *args++;
#ifdef CONFIG_SOFTMMU
mem_index = *args;
addend = tcg_out_tlb_read(s, addrlo, addrhi, opc & MO_SIZE, mem_index, 0);
tcg_out_qemu_st_index(s, COND_EQ, opc, datalo, datahi, addrlo, addend);
/* The conditional call must come last, as we're going to return here. */
label_ptr = s->code_ptr;
tcg_out_bl_noaddr(s, COND_NE);
add_qemu_ldst_label(s, false, opc, datalo, datahi, addrlo, addrhi,
mem_index, s->code_ptr, label_ptr);
#else /* !CONFIG_SOFTMMU */
if (GUEST_BASE) {
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP, GUEST_BASE);
tcg_out_qemu_st_index(s, COND_AL, opc, datalo,
datahi, addrlo, TCG_REG_TMP);
} else {
tcg_out_qemu_st_direct(s, opc, datalo, datahi, addrlo);
}
#endif
}
static tcg_insn_unit *tb_ret_addr;
static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
const TCGArg *args, const int *const_args)
{
TCGArg a0, a1, a2, a3, a4, a5;
int c;
switch (opc) {
case INDEX_op_exit_tb:
tcg_out_movi32(s, COND_AL, TCG_REG_R0, args[0]);
tcg_out_goto(s, COND_AL, tb_ret_addr);
break;
case INDEX_op_goto_tb:
if (s->tb_jmp_offset) {
/* Direct jump method */
s->tb_jmp_offset[args[0]] = tcg_current_code_size(s);
tcg_out_b_noaddr(s, COND_AL);
} else {
/* Indirect jump method */
intptr_t ptr = (intptr_t)(s->tb_next + args[0]);
tcg_out_movi32(s, COND_AL, TCG_REG_R0, ptr & ~0xfff);
tcg_out_ld32_12(s, COND_AL, TCG_REG_PC, TCG_REG_R0, ptr & 0xfff);
}
s->tb_next_offset[args[0]] = tcg_current_code_size(s);
break;
case INDEX_op_br:
tcg_out_goto_label(s, COND_AL, args[0]);
break;
case INDEX_op_ld8u_i32:
tcg_out_ld8u(s, COND_AL, args[0], args[1], args[2]);
break;
case INDEX_op_ld8s_i32:
tcg_out_ld8s(s, COND_AL, args[0], args[1], args[2]);
break;
case INDEX_op_ld16u_i32:
tcg_out_ld16u(s, COND_AL, args[0], args[1], args[2]);
break;
case INDEX_op_ld16s_i32:
tcg_out_ld16s(s, COND_AL, args[0], args[1], args[2]);
break;
case INDEX_op_ld_i32:
tcg_out_ld32u(s, COND_AL, args[0], args[1], args[2]);
break;
case INDEX_op_st8_i32:
tcg_out_st8(s, COND_AL, args[0], args[1], args[2]);
break;
case INDEX_op_st16_i32:
tcg_out_st16(s, COND_AL, args[0], args[1], args[2]);
break;
case INDEX_op_st_i32:
tcg_out_st32(s, COND_AL, args[0], args[1], args[2]);
break;
case INDEX_op_movcond_i32:
/* Constraints mean that v2 is always in the same register as dest,
* so we only need to do "if condition passed, move v1 to dest".
*/
tcg_out_dat_rIN(s, COND_AL, ARITH_CMP, ARITH_CMN, 0,
args[1], args[2], const_args[2]);
tcg_out_dat_rIK(s, tcg_cond_to_arm_cond[args[5]], ARITH_MOV,
ARITH_MVN, args[0], 0, args[3], const_args[3]);
break;
case INDEX_op_add_i32:
tcg_out_dat_rIN(s, COND_AL, ARITH_ADD, ARITH_SUB,
args[0], args[1], args[2], const_args[2]);
break;
case INDEX_op_sub_i32:
if (const_args[1]) {
if (const_args[2]) {
tcg_out_movi32(s, COND_AL, args[0], args[1] - args[2]);
} else {
tcg_out_dat_rI(s, COND_AL, ARITH_RSB,
args[0], args[2], args[1], 1);
}
} else {
tcg_out_dat_rIN(s, COND_AL, ARITH_SUB, ARITH_ADD,
args[0], args[1], args[2], const_args[2]);
}
break;
case INDEX_op_and_i32:
tcg_out_dat_rIK(s, COND_AL, ARITH_AND, ARITH_BIC,
args[0], args[1], args[2], const_args[2]);
break;
case INDEX_op_andc_i32:
tcg_out_dat_rIK(s, COND_AL, ARITH_BIC, ARITH_AND,
args[0], args[1], args[2], const_args[2]);
break;
case INDEX_op_or_i32:
c = ARITH_ORR;
goto gen_arith;
case INDEX_op_xor_i32:
c = ARITH_EOR;
/* Fall through. */
gen_arith:
tcg_out_dat_rI(s, COND_AL, c, args[0], args[1], args[2], const_args[2]);
break;
case INDEX_op_add2_i32:
a0 = args[0], a1 = args[1], a2 = args[2];
a3 = args[3], a4 = args[4], a5 = args[5];
if (a0 == a3 || (a0 == a5 && !const_args[5])) {
a0 = TCG_REG_TMP;
}
tcg_out_dat_rIN(s, COND_AL, ARITH_ADD | TO_CPSR, ARITH_SUB | TO_CPSR,
a0, a2, a4, const_args[4]);
tcg_out_dat_rIK(s, COND_AL, ARITH_ADC, ARITH_SBC,
a1, a3, a5, const_args[5]);
tcg_out_mov_reg(s, COND_AL, args[0], a0);
break;
case INDEX_op_sub2_i32:
a0 = args[0], a1 = args[1], a2 = args[2];
a3 = args[3], a4 = args[4], a5 = args[5];
if ((a0 == a3 && !const_args[3]) || (a0 == a5 && !const_args[5])) {
a0 = TCG_REG_TMP;
}
if (const_args[2]) {
if (const_args[4]) {
tcg_out_movi32(s, COND_AL, a0, a4);
a4 = a0;
}
tcg_out_dat_rI(s, COND_AL, ARITH_RSB | TO_CPSR, a0, a4, a2, 1);
} else {
tcg_out_dat_rIN(s, COND_AL, ARITH_SUB | TO_CPSR,
ARITH_ADD | TO_CPSR, a0, a2, a4, const_args[4]);
}
if (const_args[3]) {
if (const_args[5]) {
tcg_out_movi32(s, COND_AL, a1, a5);
a5 = a1;
}
tcg_out_dat_rI(s, COND_AL, ARITH_RSC, a1, a5, a3, 1);
} else {
tcg_out_dat_rIK(s, COND_AL, ARITH_SBC, ARITH_ADC,
a1, a3, a5, const_args[5]);
}
tcg_out_mov_reg(s, COND_AL, args[0], a0);
break;
case INDEX_op_neg_i32:
tcg_out_dat_imm(s, COND_AL, ARITH_RSB, args[0], args[1], 0);
break;
case INDEX_op_not_i32:
tcg_out_dat_reg(s, COND_AL,
ARITH_MVN, args[0], 0, args[1], SHIFT_IMM_LSL(0));
break;
case INDEX_op_mul_i32:
tcg_out_mul32(s, COND_AL, args[0], args[1], args[2]);
break;
case INDEX_op_mulu2_i32:
tcg_out_umull32(s, COND_AL, args[0], args[1], args[2], args[3]);
break;
case INDEX_op_muls2_i32:
tcg_out_smull32(s, COND_AL, args[0], args[1], args[2], args[3]);
break;
/* XXX: Perhaps args[2] & 0x1f is wrong */
case INDEX_op_shl_i32:
c = const_args[2] ?
SHIFT_IMM_LSL(args[2] & 0x1f) : SHIFT_REG_LSL(args[2]);
goto gen_shift32;
case INDEX_op_shr_i32:
c = const_args[2] ? (args[2] & 0x1f) ? SHIFT_IMM_LSR(args[2] & 0x1f) :
SHIFT_IMM_LSL(0) : SHIFT_REG_LSR(args[2]);
goto gen_shift32;
case INDEX_op_sar_i32:
c = const_args[2] ? (args[2] & 0x1f) ? SHIFT_IMM_ASR(args[2] & 0x1f) :
SHIFT_IMM_LSL(0) : SHIFT_REG_ASR(args[2]);
goto gen_shift32;
case INDEX_op_rotr_i32:
c = const_args[2] ? (args[2] & 0x1f) ? SHIFT_IMM_ROR(args[2] & 0x1f) :
SHIFT_IMM_LSL(0) : SHIFT_REG_ROR(args[2]);
/* Fall through. */
gen_shift32:
tcg_out_dat_reg(s, COND_AL, ARITH_MOV, args[0], 0, args[1], c);
break;
case INDEX_op_rotl_i32:
if (const_args[2]) {
tcg_out_dat_reg(s, COND_AL, ARITH_MOV, args[0], 0, args[1],
((0x20 - args[2]) & 0x1f) ?
SHIFT_IMM_ROR((0x20 - args[2]) & 0x1f) :
SHIFT_IMM_LSL(0));
} else {
tcg_out_dat_imm(s, COND_AL, ARITH_RSB, TCG_REG_TMP, args[2], 0x20);
tcg_out_dat_reg(s, COND_AL, ARITH_MOV, args[0], 0, args[1],
SHIFT_REG_ROR(TCG_REG_TMP));
}
break;
case INDEX_op_brcond_i32:
tcg_out_dat_rIN(s, COND_AL, ARITH_CMP, ARITH_CMN, 0,
args[0], args[1], const_args[1]);
tcg_out_goto_label(s, tcg_cond_to_arm_cond[args[2]], args[3]);
break;
case INDEX_op_brcond2_i32:
/* The resulting conditions are:
* TCG_COND_EQ --> a0 == a2 && a1 == a3,
* TCG_COND_NE --> (a0 != a2 && a1 == a3) || a1 != a3,
* TCG_COND_LT(U) --> (a0 < a2 && a1 == a3) || a1 < a3,
* TCG_COND_GE(U) --> (a0 >= a2 && a1 == a3) || (a1 >= a3 && a1 != a3),
* TCG_COND_LE(U) --> (a0 <= a2 && a1 == a3) || (a1 <= a3 && a1 != a3),
* TCG_COND_GT(U) --> (a0 > a2 && a1 == a3) || a1 > a3,
*/
tcg_out_dat_rIN(s, COND_AL, ARITH_CMP, ARITH_CMN, 0,
args[1], args[3], const_args[3]);
tcg_out_dat_rIN(s, COND_EQ, ARITH_CMP, ARITH_CMN, 0,
args[0], args[2], const_args[2]);
tcg_out_goto_label(s, tcg_cond_to_arm_cond[args[4]], args[5]);
break;
case INDEX_op_setcond_i32:
tcg_out_dat_rIN(s, COND_AL, ARITH_CMP, ARITH_CMN, 0,
args[1], args[2], const_args[2]);
tcg_out_dat_imm(s, tcg_cond_to_arm_cond[args[3]],
ARITH_MOV, args[0], 0, 1);
tcg_out_dat_imm(s, tcg_cond_to_arm_cond[tcg_invert_cond(args[3])],
ARITH_MOV, args[0], 0, 0);
break;
case INDEX_op_setcond2_i32:
/* See brcond2_i32 comment */
tcg_out_dat_rIN(s, COND_AL, ARITH_CMP, ARITH_CMN, 0,
args[2], args[4], const_args[4]);
tcg_out_dat_rIN(s, COND_EQ, ARITH_CMP, ARITH_CMN, 0,
args[1], args[3], const_args[3]);
tcg_out_dat_imm(s, tcg_cond_to_arm_cond[args[5]],
ARITH_MOV, args[0], 0, 1);
tcg_out_dat_imm(s, tcg_cond_to_arm_cond[tcg_invert_cond(args[5])],
ARITH_MOV, args[0], 0, 0);
break;
case INDEX_op_qemu_ld_i32:
tcg_out_qemu_ld(s, args, 0);
break;
case INDEX_op_qemu_ld_i64:
tcg_out_qemu_ld(s, args, 1);
break;
case INDEX_op_qemu_st_i32:
tcg_out_qemu_st(s, args, 0);
break;
case INDEX_op_qemu_st_i64:
tcg_out_qemu_st(s, args, 1);
break;
case INDEX_op_bswap16_i32:
tcg_out_bswap16(s, COND_AL, args[0], args[1]);
break;
case INDEX_op_bswap32_i32:
tcg_out_bswap32(s, COND_AL, args[0], args[1]);
break;
case INDEX_op_ext8s_i32:
tcg_out_ext8s(s, COND_AL, args[0], args[1]);
break;
case INDEX_op_ext16s_i32:
tcg_out_ext16s(s, COND_AL, args[0], args[1]);
break;
case INDEX_op_ext16u_i32:
tcg_out_ext16u(s, COND_AL, args[0], args[1]);
break;
case INDEX_op_deposit_i32:
tcg_out_deposit(s, COND_AL, args[0], args[2],
args[3], args[4], const_args[2]);
break;
case INDEX_op_div_i32:
tcg_out_sdiv(s, COND_AL, args[0], args[1], args[2]);
break;
case INDEX_op_divu_i32:
tcg_out_udiv(s, COND_AL, args[0], args[1], args[2]);
break;
case INDEX_op_mov_i32: /* Always emitted via tcg_out_mov. */
case INDEX_op_movi_i32: /* Always emitted via tcg_out_movi. */
case INDEX_op_call: /* Always emitted via tcg_out_call. */
default:
tcg_abort();
}
}
static const TCGTargetOpDef arm_op_defs[] = {
{ INDEX_op_exit_tb, { } },
{ INDEX_op_goto_tb, { } },
{ INDEX_op_br, { } },
{ INDEX_op_ld8u_i32, { "r", "r" } },
{ INDEX_op_ld8s_i32, { "r", "r" } },
{ INDEX_op_ld16u_i32, { "r", "r" } },
{ INDEX_op_ld16s_i32, { "r", "r" } },
{ INDEX_op_ld_i32, { "r", "r" } },
{ INDEX_op_st8_i32, { "r", "r" } },
{ INDEX_op_st16_i32, { "r", "r" } },
{ INDEX_op_st_i32, { "r", "r" } },
/* TODO: "r", "r", "ri" */
{ INDEX_op_add_i32, { "r", "r", "rIN" } },
{ INDEX_op_sub_i32, { "r", "rI", "rIN" } },
{ INDEX_op_mul_i32, { "r", "r", "r" } },
{ INDEX_op_mulu2_i32, { "r", "r", "r", "r" } },
{ INDEX_op_muls2_i32, { "r", "r", "r", "r" } },
{ INDEX_op_and_i32, { "r", "r", "rIK" } },
{ INDEX_op_andc_i32, { "r", "r", "rIK" } },
{ INDEX_op_or_i32, { "r", "r", "rI" } },
{ INDEX_op_xor_i32, { "r", "r", "rI" } },
{ INDEX_op_neg_i32, { "r", "r" } },
{ INDEX_op_not_i32, { "r", "r" } },
{ INDEX_op_shl_i32, { "r", "r", "ri" } },
{ INDEX_op_shr_i32, { "r", "r", "ri" } },
{ INDEX_op_sar_i32, { "r", "r", "ri" } },
{ INDEX_op_rotl_i32, { "r", "r", "ri" } },
{ INDEX_op_rotr_i32, { "r", "r", "ri" } },
{ INDEX_op_brcond_i32, { "r", "rIN" } },
{ INDEX_op_setcond_i32, { "r", "r", "rIN" } },
{ INDEX_op_movcond_i32, { "r", "r", "rIN", "rIK", "0" } },
{ INDEX_op_add2_i32, { "r", "r", "r", "r", "rIN", "rIK" } },
{ INDEX_op_sub2_i32, { "r", "r", "rI", "rI", "rIN", "rIK" } },
{ INDEX_op_brcond2_i32, { "r", "r", "rIN", "rIN" } },
{ INDEX_op_setcond2_i32, { "r", "r", "r", "rIN", "rIN" } },
#if TARGET_LONG_BITS == 32
{ INDEX_op_qemu_ld_i32, { "r", "l" } },
{ INDEX_op_qemu_ld_i64, { "r", "r", "l" } },
{ INDEX_op_qemu_st_i32, { "s", "s" } },
{ INDEX_op_qemu_st_i64, { "s", "s", "s" } },
#else
{ INDEX_op_qemu_ld_i32, { "r", "l", "l" } },
{ INDEX_op_qemu_ld_i64, { "r", "r", "l", "l" } },
{ INDEX_op_qemu_st_i32, { "s", "s", "s" } },
{ INDEX_op_qemu_st_i64, { "s", "s", "s", "s" } },
#endif
{ INDEX_op_bswap16_i32, { "r", "r" } },
{ INDEX_op_bswap32_i32, { "r", "r" } },
{ INDEX_op_ext8s_i32, { "r", "r" } },
{ INDEX_op_ext16s_i32, { "r", "r" } },
{ INDEX_op_ext16u_i32, { "r", "r" } },
{ INDEX_op_deposit_i32, { "r", "0", "rZ" } },
{ INDEX_op_div_i32, { "r", "r", "r" } },
{ INDEX_op_divu_i32, { "r", "r", "r" } },
{ -1 },
};
static void tcg_target_init(TCGContext *s)
{
/* Only probe for the platform and capabilities if we havn't already
determined maximum values at compile time. */
#ifndef use_idiv_instructions
{
unsigned long hwcap = qemu_getauxval(AT_HWCAP);
use_idiv_instructions = (hwcap & HWCAP_ARM_IDIVA) != 0;
}
#endif
if (__ARM_ARCH < 7) {
const char *pl = (const char *)qemu_getauxval(AT_PLATFORM);
if (pl != NULL && pl[0] == 'v' && pl[1] >= '4' && pl[1] <= '9') {
arm_arch = pl[1] - '0';
}
}
tcg_regset_set32(tcg_target_available_regs[TCG_TYPE_I32], 0, 0xffff);
tcg_regset_set32(tcg_target_call_clobber_regs, 0,
(1 << TCG_REG_R0) |
(1 << TCG_REG_R1) |
(1 << TCG_REG_R2) |
(1 << TCG_REG_R3) |
(1 << TCG_REG_R12) |
(1 << TCG_REG_R14));
tcg_regset_clear(s->reserved_regs);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_CALL_STACK);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_TMP);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_PC);
tcg_add_target_add_op_defs(arm_op_defs);
}
static inline void tcg_out_ld(TCGContext *s, TCGType type, TCGReg arg,
TCGReg arg1, intptr_t arg2)
{
tcg_out_ld32u(s, COND_AL, arg, arg1, arg2);
}
static inline void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg,
TCGReg arg1, intptr_t arg2)
{
tcg_out_st32(s, COND_AL, arg, arg1, arg2);
}
static inline void tcg_out_mov(TCGContext *s, TCGType type,
TCGReg ret, TCGReg arg)
{
tcg_out_dat_reg(s, COND_AL, ARITH_MOV, ret, 0, arg, SHIFT_IMM_LSL(0));
}
static inline void tcg_out_movi(TCGContext *s, TCGType type,
TCGReg ret, tcg_target_long arg)
{
tcg_out_movi32(s, COND_AL, ret, arg);
}
/* Compute frame size via macros, to share between tcg_target_qemu_prologue
and tcg_register_jit. */
#define PUSH_SIZE ((11 - 4 + 1 + 1) * sizeof(tcg_target_long))
#define FRAME_SIZE \
((PUSH_SIZE \
+ TCG_STATIC_CALL_ARGS_SIZE \
+ CPU_TEMP_BUF_NLONGS * sizeof(long) \
+ TCG_TARGET_STACK_ALIGN - 1) \
& -TCG_TARGET_STACK_ALIGN)
static void tcg_target_qemu_prologue(TCGContext *s)
{
int stack_addend;
/* Calling convention requires us to save r4-r11 and lr. */
/* stmdb sp!, { r4 - r11, lr } */
tcg_out32(s, (COND_AL << 28) | 0x092d4ff0);
/* Reserve callee argument and tcg temp space. */
stack_addend = FRAME_SIZE - PUSH_SIZE;
tcg_out_dat_rI(s, COND_AL, ARITH_SUB, TCG_REG_CALL_STACK,
TCG_REG_CALL_STACK, stack_addend, 1);
tcg_set_frame(s, TCG_REG_CALL_STACK, TCG_STATIC_CALL_ARGS_SIZE,
CPU_TEMP_BUF_NLONGS * sizeof(long));
tcg_out_mov(s, TCG_TYPE_PTR, TCG_AREG0, tcg_target_call_iarg_regs[0]);
tcg_out_bx(s, COND_AL, tcg_target_call_iarg_regs[1]);
tb_ret_addr = s->code_ptr;
/* Epilogue. We branch here via tb_ret_addr. */
tcg_out_dat_rI(s, COND_AL, ARITH_ADD, TCG_REG_CALL_STACK,
TCG_REG_CALL_STACK, stack_addend, 1);
/* ldmia sp!, { r4 - r11, pc } */
tcg_out32(s, (COND_AL << 28) | 0x08bd8ff0);
}
typedef struct {
DebugFrameCIE cie;
DebugFrameFDEHeader fde;
uint8_t fde_def_cfa[4];
uint8_t fde_reg_ofs[18];
} DebugFrame;
#define ELF_HOST_MACHINE EM_ARM
/* We're expecting a 2 byte uleb128 encoded value. */
QEMU_BUILD_BUG_ON(FRAME_SIZE >= (1 << 14));
static DebugFrame debug_frame = {
.cie.len = sizeof(DebugFrameCIE)-4, /* length after .len member */
.cie.id = -1,
.cie.version = 1,
.cie.code_align = 1,
.cie.data_align = 0x7c, /* sleb128 -4 */
.cie.return_column = 14,
/* Total FDE size does not include the "len" member. */
.fde.len = sizeof(DebugFrame) - offsetof(DebugFrame, fde.cie_offset),
.fde_def_cfa = {
12, 13, /* DW_CFA_def_cfa sp, ... */
(FRAME_SIZE & 0x7f) | 0x80, /* ... uleb128 FRAME_SIZE */
(FRAME_SIZE >> 7)
},
.fde_reg_ofs = {
/* The following must match the stmdb in the prologue. */
0x8e, 1, /* DW_CFA_offset, lr, -4 */
0x8b, 2, /* DW_CFA_offset, r11, -8 */
0x8a, 3, /* DW_CFA_offset, r10, -12 */
0x89, 4, /* DW_CFA_offset, r9, -16 */
0x88, 5, /* DW_CFA_offset, r8, -20 */
0x87, 6, /* DW_CFA_offset, r7, -24 */
0x86, 7, /* DW_CFA_offset, r6, -28 */
0x85, 8, /* DW_CFA_offset, r5, -32 */
0x84, 9, /* DW_CFA_offset, r4, -36 */
}
};
void tcg_register_jit(void *buf, size_t buf_size)
{
debug_frame.fde.func_start = (tcg_target_long) buf;
debug_frame.fde.func_len = buf_size;
tcg_register_jit_int(buf, buf_size, &debug_frame, sizeof(debug_frame));
}
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