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07ce0b0530
qemu/tcg/riscv/tcg-target.c.inc
Zihao Yu d2f3066eb2 tcg/riscv: Fix illegal shift instructions 
Out-of-range shifts have undefined results, but must not trap.
Mask off immediate shift counts to solve this problem.

This bug can be reproduced by running the following guest instructions:

  xor %ecx,%ecx
  sar %cl,%eax
  cmovne %edi,%eax

After optimization, the tcg opcodes of the sar are

  movi_i32 tmp3,$0xffffffffffffffff  pref=all
  sar_i32 tmp3,eax,tmp3              dead: 2  pref=all
  mov_i32 cc_dst,eax                 sync: 0  dead: 1 pref=0xffc0300
  mov_i32 cc_src,tmp3                sync: 0  dead: 0 1  pref=all
  movi_i32 cc_op,$0x31               sync: 0  dead: 0  pref=all

The sar_i32 opcode is a shift by -1, which unmasked generates

  0x200808d618:  fffa5b9b          illegal

Signed-off-by: Zihao Yu <yuzihao@ict.ac.cn>
Message-Id: <20201216081206.9628-1-yuzihao@ict.ac.cn>
[rth: Reworded the patch description.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2021-01-04 06:32:58 -10:00

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/*
* Tiny Code Generator for QEMU
*
* Copyright (c) 2018 SiFive, Inc
* Copyright (c) 2008-2009 Arnaud Patard <arnaud.patard@rtp-net.org>
* Copyright (c) 2009 Aurelien Jarno <aurelien@aurel32.net>
* Copyright (c) 2008 Fabrice Bellard
*
* Based on i386/tcg-target.c and mips/tcg-target.c
*
* 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 "../tcg-pool.c.inc"
#ifdef CONFIG_DEBUG_TCG
static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
"zero",
"ra",
"sp",
"gp",
"tp",
"t0",
"t1",
"t2",
"s0",
"s1",
"a0",
"a1",
"a2",
"a3",
"a4",
"a5",
"a6",
"a7",
"s2",
"s3",
"s4",
"s5",
"s6",
"s7",
"s8",
"s9",
"s10",
"s11",
"t3",
"t4",
"t5",
"t6"
};
#endif
static const int tcg_target_reg_alloc_order[] = {
/* Call saved registers */
/* TCG_REG_S0 reservered for TCG_AREG0 */
TCG_REG_S1,
TCG_REG_S2,
TCG_REG_S3,
TCG_REG_S4,
TCG_REG_S5,
TCG_REG_S6,
TCG_REG_S7,
TCG_REG_S8,
TCG_REG_S9,
TCG_REG_S10,
TCG_REG_S11,
/* Call clobbered registers */
TCG_REG_T0,
TCG_REG_T1,
TCG_REG_T2,
TCG_REG_T3,
TCG_REG_T4,
TCG_REG_T5,
TCG_REG_T6,
/* Argument registers */
TCG_REG_A0,
TCG_REG_A1,
TCG_REG_A2,
TCG_REG_A3,
TCG_REG_A4,
TCG_REG_A5,
TCG_REG_A6,
TCG_REG_A7,
};
static const int tcg_target_call_iarg_regs[] = {
TCG_REG_A0,
TCG_REG_A1,
TCG_REG_A2,
TCG_REG_A3,
TCG_REG_A4,
TCG_REG_A5,
TCG_REG_A6,
TCG_REG_A7,
};
static const int tcg_target_call_oarg_regs[] = {
TCG_REG_A0,
TCG_REG_A1,
};
#define TCG_CT_CONST_ZERO 0x100
#define TCG_CT_CONST_S12 0x200
#define TCG_CT_CONST_N12 0x400
#define TCG_CT_CONST_M12 0x800
static inline tcg_target_long sextreg(tcg_target_long val, int pos, int len)
{
if (TCG_TARGET_REG_BITS == 32) {
return sextract32(val, pos, len);
} else {
return sextract64(val, pos, len);
}
}
/* parse target specific constraints */
static const char *target_parse_constraint(TCGArgConstraint *ct,
const char *ct_str, TCGType type)
{
switch (*ct_str++) {
case 'r':
ct->regs = 0xffffffff;
break;
case 'L':
/* qemu_ld/qemu_st constraint */
ct->regs = 0xffffffff;
/* qemu_ld/qemu_st uses TCG_REG_TMP0 */
#if defined(CONFIG_SOFTMMU)
tcg_regset_reset_reg(ct->regs, tcg_target_call_iarg_regs[0]);
tcg_regset_reset_reg(ct->regs, tcg_target_call_iarg_regs[1]);
tcg_regset_reset_reg(ct->regs, tcg_target_call_iarg_regs[2]);
tcg_regset_reset_reg(ct->regs, tcg_target_call_iarg_regs[3]);
tcg_regset_reset_reg(ct->regs, tcg_target_call_iarg_regs[4]);
#endif
break;
case 'I':
ct->ct |= TCG_CT_CONST_S12;
break;
case 'N':
ct->ct |= TCG_CT_CONST_N12;
break;
case 'M':
ct->ct |= TCG_CT_CONST_M12;
break;
case 'Z':
/* we can use a zero immediate as a zero register argument. */
ct->ct |= TCG_CT_CONST_ZERO;
break;
default:
return NULL;
}
return ct_str;
}
/* test if a constant matches the constraint */
static int tcg_target_const_match(tcg_target_long val, TCGType type,
const TCGArgConstraint *arg_ct)
{
int ct = arg_ct->ct;
if (ct & TCG_CT_CONST) {
return 1;
}
if ((ct & TCG_CT_CONST_ZERO) && val == 0) {
return 1;
}
if ((ct & TCG_CT_CONST_S12) && val == sextreg(val, 0, 12)) {
return 1;
}
if ((ct & TCG_CT_CONST_N12) && -val == sextreg(-val, 0, 12)) {
return 1;
}
if ((ct & TCG_CT_CONST_M12) && val >= -0xfff && val <= 0xfff) {
return 1;
}
return 0;
}
/*
* RISC-V Base ISA opcodes (IM)
*/
typedef enum {
OPC_ADD = 0x33,
OPC_ADDI = 0x13,
OPC_AND = 0x7033,
OPC_ANDI = 0x7013,
OPC_AUIPC = 0x17,
OPC_BEQ = 0x63,
OPC_BGE = 0x5063,
OPC_BGEU = 0x7063,
OPC_BLT = 0x4063,
OPC_BLTU = 0x6063,
OPC_BNE = 0x1063,
OPC_DIV = 0x2004033,
OPC_DIVU = 0x2005033,
OPC_JAL = 0x6f,
OPC_JALR = 0x67,
OPC_LB = 0x3,
OPC_LBU = 0x4003,
OPC_LD = 0x3003,
OPC_LH = 0x1003,
OPC_LHU = 0x5003,
OPC_LUI = 0x37,
OPC_LW = 0x2003,
OPC_LWU = 0x6003,
OPC_MUL = 0x2000033,
OPC_MULH = 0x2001033,
OPC_MULHSU = 0x2002033,
OPC_MULHU = 0x2003033,
OPC_OR = 0x6033,
OPC_ORI = 0x6013,
OPC_REM = 0x2006033,
OPC_REMU = 0x2007033,
OPC_SB = 0x23,
OPC_SD = 0x3023,
OPC_SH = 0x1023,
OPC_SLL = 0x1033,
OPC_SLLI = 0x1013,
OPC_SLT = 0x2033,
OPC_SLTI = 0x2013,
OPC_SLTIU = 0x3013,
OPC_SLTU = 0x3033,
OPC_SRA = 0x40005033,
OPC_SRAI = 0x40005013,
OPC_SRL = 0x5033,
OPC_SRLI = 0x5013,
OPC_SUB = 0x40000033,
OPC_SW = 0x2023,
OPC_XOR = 0x4033,
OPC_XORI = 0x4013,
#if TCG_TARGET_REG_BITS == 64
OPC_ADDIW = 0x1b,
OPC_ADDW = 0x3b,
OPC_DIVUW = 0x200503b,
OPC_DIVW = 0x200403b,
OPC_MULW = 0x200003b,
OPC_REMUW = 0x200703b,
OPC_REMW = 0x200603b,
OPC_SLLIW = 0x101b,
OPC_SLLW = 0x103b,
OPC_SRAIW = 0x4000501b,
OPC_SRAW = 0x4000503b,
OPC_SRLIW = 0x501b,
OPC_SRLW = 0x503b,
OPC_SUBW = 0x4000003b,
#else
/* Simplify code throughout by defining aliases for RV32. */
OPC_ADDIW = OPC_ADDI,
OPC_ADDW = OPC_ADD,
OPC_DIVUW = OPC_DIVU,
OPC_DIVW = OPC_DIV,
OPC_MULW = OPC_MUL,
OPC_REMUW = OPC_REMU,
OPC_REMW = OPC_REM,
OPC_SLLIW = OPC_SLLI,
OPC_SLLW = OPC_SLL,
OPC_SRAIW = OPC_SRAI,
OPC_SRAW = OPC_SRA,
OPC_SRLIW = OPC_SRLI,
OPC_SRLW = OPC_SRL,
OPC_SUBW = OPC_SUB,
#endif
OPC_FENCE = 0x0000000f,
} RISCVInsn;
/*
* RISC-V immediate and instruction encoders (excludes 16-bit RVC)
*/
/* Type-R */
static int32_t encode_r(RISCVInsn opc, TCGReg rd, TCGReg rs1, TCGReg rs2)
{
return opc | (rd & 0x1f) << 7 | (rs1 & 0x1f) << 15 | (rs2 & 0x1f) << 20;
}
/* Type-I */
static int32_t encode_imm12(uint32_t imm)
{
return (imm & 0xfff) << 20;
}
static int32_t encode_i(RISCVInsn opc, TCGReg rd, TCGReg rs1, uint32_t imm)
{
return opc | (rd & 0x1f) << 7 | (rs1 & 0x1f) << 15 | encode_imm12(imm);
}
/* Type-S */
static int32_t encode_simm12(uint32_t imm)
{
int32_t ret = 0;
ret |= (imm & 0xFE0) << 20;
ret |= (imm & 0x1F) << 7;
return ret;
}
static int32_t encode_s(RISCVInsn opc, TCGReg rs1, TCGReg rs2, uint32_t imm)
{
return opc | (rs1 & 0x1f) << 15 | (rs2 & 0x1f) << 20 | encode_simm12(imm);
}
/* Type-SB */
static int32_t encode_sbimm12(uint32_t imm)
{
int32_t ret = 0;
ret |= (imm & 0x1000) << 19;
ret |= (imm & 0x7e0) << 20;
ret |= (imm & 0x1e) << 7;
ret |= (imm & 0x800) >> 4;
return ret;
}
static int32_t encode_sb(RISCVInsn opc, TCGReg rs1, TCGReg rs2, uint32_t imm)
{
return opc | (rs1 & 0x1f) << 15 | (rs2 & 0x1f) << 20 | encode_sbimm12(imm);
}
/* Type-U */
static int32_t encode_uimm20(uint32_t imm)
{
return imm & 0xfffff000;
}
static int32_t encode_u(RISCVInsn opc, TCGReg rd, uint32_t imm)
{
return opc | (rd & 0x1f) << 7 | encode_uimm20(imm);
}
/* Type-UJ */
static int32_t encode_ujimm20(uint32_t imm)
{
int32_t ret = 0;
ret |= (imm & 0x0007fe) << (21 - 1);
ret |= (imm & 0x000800) << (20 - 11);
ret |= (imm & 0x0ff000) << (12 - 12);
ret |= (imm & 0x100000) << (31 - 20);
return ret;
}
static int32_t encode_uj(RISCVInsn opc, TCGReg rd, uint32_t imm)
{
return opc | (rd & 0x1f) << 7 | encode_ujimm20(imm);
}
/*
* RISC-V instruction emitters
*/
static void tcg_out_opc_reg(TCGContext *s, RISCVInsn opc,
TCGReg rd, TCGReg rs1, TCGReg rs2)
{
tcg_out32(s, encode_r(opc, rd, rs1, rs2));
}
static void tcg_out_opc_imm(TCGContext *s, RISCVInsn opc,
TCGReg rd, TCGReg rs1, TCGArg imm)
{
tcg_out32(s, encode_i(opc, rd, rs1, imm));
}
static void tcg_out_opc_store(TCGContext *s, RISCVInsn opc,
TCGReg rs1, TCGReg rs2, uint32_t imm)
{
tcg_out32(s, encode_s(opc, rs1, rs2, imm));
}
static void tcg_out_opc_branch(TCGContext *s, RISCVInsn opc,
TCGReg rs1, TCGReg rs2, uint32_t imm)
{
tcg_out32(s, encode_sb(opc, rs1, rs2, imm));
}
static void tcg_out_opc_upper(TCGContext *s, RISCVInsn opc,
TCGReg rd, uint32_t imm)
{
tcg_out32(s, encode_u(opc, rd, imm));
}
static void tcg_out_opc_jump(TCGContext *s, RISCVInsn opc,
TCGReg rd, uint32_t imm)
{
tcg_out32(s, encode_uj(opc, rd, imm));
}
static void tcg_out_nop_fill(tcg_insn_unit *p, int count)
{
int i;
for (i = 0; i < count; ++i) {
p[i] = encode_i(OPC_ADDI, TCG_REG_ZERO, TCG_REG_ZERO, 0);
}
}
/*
* Relocations
*/
static bool reloc_sbimm12(tcg_insn_unit *code_ptr, tcg_insn_unit *target)
{
intptr_t offset = (intptr_t)target - (intptr_t)code_ptr;
if (offset == sextreg(offset, 1, 12) << 1) {
code_ptr[0] |= encode_sbimm12(offset);
return true;
}
return false;
}
static bool reloc_jimm20(tcg_insn_unit *code_ptr, tcg_insn_unit *target)
{
intptr_t offset = (intptr_t)target - (intptr_t)code_ptr;
if (offset == sextreg(offset, 1, 20) << 1) {
code_ptr[0] |= encode_ujimm20(offset);
return true;
}
return false;
}
static bool reloc_call(tcg_insn_unit *code_ptr, tcg_insn_unit *target)
{
intptr_t offset = (intptr_t)target - (intptr_t)code_ptr;
int32_t lo = sextreg(offset, 0, 12);
int32_t hi = offset - lo;
if (offset == hi + lo) {
code_ptr[0] |= encode_uimm20(hi);
code_ptr[1] |= encode_imm12(lo);
return true;
}
return false;
}
static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
intptr_t value, intptr_t addend)
{
uint32_t insn = *code_ptr;
intptr_t diff;
bool short_jmp;
tcg_debug_assert(addend == 0);
switch (type) {
case R_RISCV_BRANCH:
diff = value - (uintptr_t)code_ptr;
short_jmp = diff == sextreg(diff, 0, 12);
if (short_jmp) {
return reloc_sbimm12(code_ptr, (tcg_insn_unit *)value);
} else {
/* Invert the condition */
insn = insn ^ (1 << 12);
/* Clear the offset */
insn &= 0x01fff07f;
/* Set the offset to the PC + 8 */
insn |= encode_sbimm12(8);
/* Move forward */
code_ptr[0] = insn;
/* Overwrite the NOP with jal x0,value */
diff = value - (uintptr_t)(code_ptr + 1);
insn = encode_uj(OPC_JAL, TCG_REG_ZERO, diff);
code_ptr[1] = insn;
return true;
}
break;
case R_RISCV_JAL:
return reloc_jimm20(code_ptr, (tcg_insn_unit *)value);
case R_RISCV_CALL:
return reloc_call(code_ptr, (tcg_insn_unit *)value);
default:
tcg_abort();
}
}
/*
* TCG intrinsics
*/
static bool tcg_out_mov(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg)
{
if (ret == arg) {
return true;
}
switch (type) {
case TCG_TYPE_I32:
case TCG_TYPE_I64:
tcg_out_opc_imm(s, OPC_ADDI, ret, arg, 0);
break;
default:
g_assert_not_reached();
}
return true;
}
static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd,
tcg_target_long val)
{
tcg_target_long lo, hi, tmp;
int shift, ret;
if (TCG_TARGET_REG_BITS == 64 && type == TCG_TYPE_I32) {
val = (int32_t)val;
}
lo = sextreg(val, 0, 12);
if (val == lo) {
tcg_out_opc_imm(s, OPC_ADDI, rd, TCG_REG_ZERO, lo);
return;
}
hi = val - lo;
if (TCG_TARGET_REG_BITS == 32 || val == (int32_t)val) {
tcg_out_opc_upper(s, OPC_LUI, rd, hi);
if (lo != 0) {
tcg_out_opc_imm(s, OPC_ADDIW, rd, rd, lo);
}
return;
}
/* We can only be here if TCG_TARGET_REG_BITS != 32 */
tmp = tcg_pcrel_diff(s, (void *)val);
if (tmp == (int32_t)tmp) {
tcg_out_opc_upper(s, OPC_AUIPC, rd, 0);
tcg_out_opc_imm(s, OPC_ADDI, rd, rd, 0);
ret = reloc_call(s->code_ptr - 2, (tcg_insn_unit *)val);
tcg_debug_assert(ret == true);
return;
}
/* Look for a single 20-bit section. */
shift = ctz64(val);
tmp = val >> shift;
if (tmp == sextreg(tmp, 0, 20)) {
tcg_out_opc_upper(s, OPC_LUI, rd, tmp << 12);
if (shift > 12) {
tcg_out_opc_imm(s, OPC_SLLI, rd, rd, shift - 12);
} else {
tcg_out_opc_imm(s, OPC_SRAI, rd, rd, 12 - shift);
}
return;
}
/* Look for a few high zero bits, with lots of bits set in the middle. */
shift = clz64(val);
tmp = val << shift;
if (tmp == sextreg(tmp, 12, 20) << 12) {
tcg_out_opc_upper(s, OPC_LUI, rd, tmp);
tcg_out_opc_imm(s, OPC_SRLI, rd, rd, shift);
return;
} else if (tmp == sextreg(tmp, 0, 12)) {
tcg_out_opc_imm(s, OPC_ADDI, rd, TCG_REG_ZERO, tmp);
tcg_out_opc_imm(s, OPC_SRLI, rd, rd, shift);
return;
}
/* Drop into the constant pool. */
new_pool_label(s, val, R_RISCV_CALL, s->code_ptr, 0);
tcg_out_opc_upper(s, OPC_AUIPC, rd, 0);
tcg_out_opc_imm(s, OPC_LD, rd, rd, 0);
}
static void tcg_out_ext8u(TCGContext *s, TCGReg ret, TCGReg arg)
{
tcg_out_opc_imm(s, OPC_ANDI, ret, arg, 0xff);
}
static void tcg_out_ext16u(TCGContext *s, TCGReg ret, TCGReg arg)
{
tcg_out_opc_imm(s, OPC_SLLIW, ret, arg, 16);
tcg_out_opc_imm(s, OPC_SRLIW, ret, ret, 16);
}
static void tcg_out_ext32u(TCGContext *s, TCGReg ret, TCGReg arg)
{
tcg_out_opc_imm(s, OPC_SLLI, ret, arg, 32);
tcg_out_opc_imm(s, OPC_SRLI, ret, ret, 32);
}
static void tcg_out_ext8s(TCGContext *s, TCGReg ret, TCGReg arg)
{
tcg_out_opc_imm(s, OPC_SLLIW, ret, arg, 24);
tcg_out_opc_imm(s, OPC_SRAIW, ret, ret, 24);
}
static void tcg_out_ext16s(TCGContext *s, TCGReg ret, TCGReg arg)
{
tcg_out_opc_imm(s, OPC_SLLIW, ret, arg, 16);
tcg_out_opc_imm(s, OPC_SRAIW, ret, ret, 16);
}
static void tcg_out_ext32s(TCGContext *s, TCGReg ret, TCGReg arg)
{
tcg_out_opc_imm(s, OPC_ADDIW, ret, arg, 0);
}
static void tcg_out_ldst(TCGContext *s, RISCVInsn opc, TCGReg data,
TCGReg addr, intptr_t offset)
{
intptr_t imm12 = sextreg(offset, 0, 12);
if (offset != imm12) {
intptr_t diff = offset - (uintptr_t)s->code_ptr;
if (addr == TCG_REG_ZERO && diff == (int32_t)diff) {
imm12 = sextreg(diff, 0, 12);
tcg_out_opc_upper(s, OPC_AUIPC, TCG_REG_TMP2, diff - imm12);
} else {
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP2, offset - imm12);
if (addr != TCG_REG_ZERO) {
tcg_out_opc_reg(s, OPC_ADD, TCG_REG_TMP2, TCG_REG_TMP2, addr);
}
}
addr = TCG_REG_TMP2;
}
switch (opc) {
case OPC_SB:
case OPC_SH:
case OPC_SW:
case OPC_SD:
tcg_out_opc_store(s, opc, addr, data, imm12);
break;
case OPC_LB:
case OPC_LBU:
case OPC_LH:
case OPC_LHU:
case OPC_LW:
case OPC_LWU:
case OPC_LD:
tcg_out_opc_imm(s, opc, data, addr, imm12);
break;
default:
g_assert_not_reached();
}
}
static void tcg_out_ld(TCGContext *s, TCGType type, TCGReg arg,
TCGReg arg1, intptr_t arg2)
{
bool is32bit = (TCG_TARGET_REG_BITS == 32 || type == TCG_TYPE_I32);
tcg_out_ldst(s, is32bit ? OPC_LW : OPC_LD, arg, arg1, arg2);
}
static void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg,
TCGReg arg1, intptr_t arg2)
{
bool is32bit = (TCG_TARGET_REG_BITS == 32 || type == TCG_TYPE_I32);
tcg_out_ldst(s, is32bit ? OPC_SW : OPC_SD, arg, arg1, arg2);
}
static bool tcg_out_sti(TCGContext *s, TCGType type, TCGArg val,
TCGReg base, intptr_t ofs)
{
if (val == 0) {
tcg_out_st(s, type, TCG_REG_ZERO, base, ofs);
return true;
}
return false;
}
static void tcg_out_addsub2(TCGContext *s,
TCGReg rl, TCGReg rh,
TCGReg al, TCGReg ah,
TCGArg bl, TCGArg bh,
bool cbl, bool cbh, bool is_sub, bool is32bit)
{
const RISCVInsn opc_add = is32bit ? OPC_ADDW : OPC_ADD;
const RISCVInsn opc_addi = is32bit ? OPC_ADDIW : OPC_ADDI;
const RISCVInsn opc_sub = is32bit ? OPC_SUBW : OPC_SUB;
TCGReg th = TCG_REG_TMP1;
/* If we have a negative constant such that negating it would
make the high part zero, we can (usually) eliminate one insn. */
if (cbl && cbh && bh == -1 && bl != 0) {
bl = -bl;
bh = 0;
is_sub = !is_sub;
}
/* By operating on the high part first, we get to use the final
carry operation to move back from the temporary. */
if (!cbh) {
tcg_out_opc_reg(s, (is_sub ? opc_sub : opc_add), th, ah, bh);
} else if (bh != 0 || ah == rl) {
tcg_out_opc_imm(s, opc_addi, th, ah, (is_sub ? -bh : bh));
} else {
th = ah;
}
/* Note that tcg optimization should eliminate the bl == 0 case. */
if (is_sub) {
if (cbl) {
tcg_out_opc_imm(s, OPC_SLTIU, TCG_REG_TMP0, al, bl);
tcg_out_opc_imm(s, opc_addi, rl, al, -bl);
} else {
tcg_out_opc_reg(s, OPC_SLTU, TCG_REG_TMP0, al, bl);
tcg_out_opc_reg(s, opc_sub, rl, al, bl);
}
tcg_out_opc_reg(s, opc_sub, rh, th, TCG_REG_TMP0);
} else {
if (cbl) {
tcg_out_opc_imm(s, opc_addi, rl, al, bl);
tcg_out_opc_imm(s, OPC_SLTIU, TCG_REG_TMP0, rl, bl);
} else if (rl == al && rl == bl) {
tcg_out_opc_imm(s, OPC_SLTI, TCG_REG_TMP0, al, 0);
tcg_out_opc_reg(s, opc_addi, rl, al, bl);
} else {
tcg_out_opc_reg(s, opc_add, rl, al, bl);
tcg_out_opc_reg(s, OPC_SLTU, TCG_REG_TMP0,
rl, (rl == bl ? al : bl));
}
tcg_out_opc_reg(s, opc_add, rh, th, TCG_REG_TMP0);
}
}
static const struct {
RISCVInsn op;
bool swap;
} tcg_brcond_to_riscv[] = {
[TCG_COND_EQ] = { OPC_BEQ, false },
[TCG_COND_NE] = { OPC_BNE, false },
[TCG_COND_LT] = { OPC_BLT, false },
[TCG_COND_GE] = { OPC_BGE, false },
[TCG_COND_LE] = { OPC_BGE, true },
[TCG_COND_GT] = { OPC_BLT, true },
[TCG_COND_LTU] = { OPC_BLTU, false },
[TCG_COND_GEU] = { OPC_BGEU, false },
[TCG_COND_LEU] = { OPC_BGEU, true },
[TCG_COND_GTU] = { OPC_BLTU, true }
};
static void tcg_out_brcond(TCGContext *s, TCGCond cond, TCGReg arg1,
TCGReg arg2, TCGLabel *l)
{
RISCVInsn op = tcg_brcond_to_riscv[cond].op;
tcg_debug_assert(op != 0);
if (tcg_brcond_to_riscv[cond].swap) {
TCGReg t = arg1;
arg1 = arg2;
arg2 = t;
}
if (l->has_value) {
intptr_t diff = tcg_pcrel_diff(s, l->u.value_ptr);
if (diff == sextreg(diff, 0, 12)) {
tcg_out_opc_branch(s, op, arg1, arg2, diff);
} else {
/* Invert the conditional branch. */
tcg_out_opc_branch(s, op ^ (1 << 12), arg1, arg2, 8);
tcg_out_opc_jump(s, OPC_JAL, TCG_REG_ZERO, diff - 4);
}
} else {
tcg_out_reloc(s, s->code_ptr, R_RISCV_BRANCH, l, 0);
tcg_out_opc_branch(s, op, arg1, arg2, 0);
/* NOP to allow patching later */
tcg_out_opc_imm(s, OPC_ADDI, TCG_REG_ZERO, TCG_REG_ZERO, 0);
}
}
static void tcg_out_setcond(TCGContext *s, TCGCond cond, TCGReg ret,
TCGReg arg1, TCGReg arg2)
{
switch (cond) {
case TCG_COND_EQ:
tcg_out_opc_reg(s, OPC_SUB, ret, arg1, arg2);
tcg_out_opc_imm(s, OPC_SLTIU, ret, ret, 1);
break;
case TCG_COND_NE:
tcg_out_opc_reg(s, OPC_SUB, ret, arg1, arg2);
tcg_out_opc_reg(s, OPC_SLTU, ret, TCG_REG_ZERO, ret);
break;
case TCG_COND_LT:
tcg_out_opc_reg(s, OPC_SLT, ret, arg1, arg2);
break;
case TCG_COND_GE:
tcg_out_opc_reg(s, OPC_SLT, ret, arg1, arg2);
tcg_out_opc_imm(s, OPC_XORI, ret, ret, 1);
break;
case TCG_COND_LE:
tcg_out_opc_reg(s, OPC_SLT, ret, arg2, arg1);
tcg_out_opc_imm(s, OPC_XORI, ret, ret, 1);
break;
case TCG_COND_GT:
tcg_out_opc_reg(s, OPC_SLT, ret, arg2, arg1);
break;
case TCG_COND_LTU:
tcg_out_opc_reg(s, OPC_SLTU, ret, arg1, arg2);
break;
case TCG_COND_GEU:
tcg_out_opc_reg(s, OPC_SLTU, ret, arg1, arg2);
tcg_out_opc_imm(s, OPC_XORI, ret, ret, 1);
break;
case TCG_COND_LEU:
tcg_out_opc_reg(s, OPC_SLTU, ret, arg2, arg1);
tcg_out_opc_imm(s, OPC_XORI, ret, ret, 1);
break;
case TCG_COND_GTU:
tcg_out_opc_reg(s, OPC_SLTU, ret, arg2, arg1);
break;
default:
g_assert_not_reached();
break;
}
}
static void tcg_out_brcond2(TCGContext *s, TCGCond cond, TCGReg al, TCGReg ah,
TCGReg bl, TCGReg bh, TCGLabel *l)
{
/* todo */
g_assert_not_reached();
}
static void tcg_out_setcond2(TCGContext *s, TCGCond cond, TCGReg ret,
TCGReg al, TCGReg ah, TCGReg bl, TCGReg bh)
{
/* todo */
g_assert_not_reached();
}
static inline void tcg_out_goto(TCGContext *s, tcg_insn_unit *target)
{
ptrdiff_t offset = tcg_pcrel_diff(s, target);
tcg_debug_assert(offset == sextreg(offset, 1, 20) << 1);
tcg_out_opc_jump(s, OPC_JAL, TCG_REG_ZERO, offset);
}
static void tcg_out_call_int(TCGContext *s, tcg_insn_unit *arg, bool tail)
{
TCGReg link = tail ? TCG_REG_ZERO : TCG_REG_RA;
ptrdiff_t offset = tcg_pcrel_diff(s, arg);
int ret;
if (offset == sextreg(offset, 1, 20) << 1) {
/* short jump: -2097150 to 2097152 */
tcg_out_opc_jump(s, OPC_JAL, link, offset);
} else if (TCG_TARGET_REG_BITS == 32 ||
offset == sextreg(offset, 1, 31) << 1) {
/* long jump: -2147483646 to 2147483648 */
tcg_out_opc_upper(s, OPC_AUIPC, TCG_REG_TMP0, 0);
tcg_out_opc_imm(s, OPC_JALR, link, TCG_REG_TMP0, 0);
ret = reloc_call(s->code_ptr - 2, arg);\
tcg_debug_assert(ret == true);
} else if (TCG_TARGET_REG_BITS == 64) {
/* far jump: 64-bit */
tcg_target_long imm = sextreg((tcg_target_long)arg, 0, 12);
tcg_target_long base = (tcg_target_long)arg - imm;
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP0, base);
tcg_out_opc_imm(s, OPC_JALR, link, TCG_REG_TMP0, imm);
} else {
g_assert_not_reached();
}
}
static void tcg_out_call(TCGContext *s, tcg_insn_unit *arg)
{
tcg_out_call_int(s, arg, false);
}
static void tcg_out_mb(TCGContext *s, TCGArg a0)
{
tcg_insn_unit insn = OPC_FENCE;
if (a0 & TCG_MO_LD_LD) {
insn |= 0x02200000;
}
if (a0 & TCG_MO_ST_LD) {
insn |= 0x01200000;
}
if (a0 & TCG_MO_LD_ST) {
insn |= 0x02100000;
}
if (a0 & TCG_MO_ST_ST) {
insn |= 0x02200000;
}
tcg_out32(s, insn);
}
/*
* Load/store and TLB
*/
#if defined(CONFIG_SOFTMMU)
#include "../tcg-ldst.c.inc"
/* helper signature: helper_ret_ld_mmu(CPUState *env, target_ulong addr,
* TCGMemOpIdx oi, 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_LESW] = helper_le_ldsw_mmu,
[MO_LEUL] = helper_le_ldul_mmu,
#if TCG_TARGET_REG_BITS == 64
[MO_LESL] = helper_le_ldsl_mmu,
#endif
[MO_LEQ] = helper_le_ldq_mmu,
[MO_BEUW] = helper_be_lduw_mmu,
[MO_BESW] = helper_be_ldsw_mmu,
[MO_BEUL] = helper_be_ldul_mmu,
#if TCG_TARGET_REG_BITS == 64
[MO_BESL] = helper_be_ldsl_mmu,
#endif
[MO_BEQ] = helper_be_ldq_mmu,
};
/* helper signature: helper_ret_st_mmu(CPUState *env, target_ulong addr,
* uintxx_t val, TCGMemOpIdx oi,
* 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,
};
/* We don't support oversize guests */
QEMU_BUILD_BUG_ON(TCG_TARGET_REG_BITS < TARGET_LONG_BITS);
/* We expect to use a 12-bit negative offset from ENV. */
QEMU_BUILD_BUG_ON(TLB_MASK_TABLE_OFS(0) > 0);
QEMU_BUILD_BUG_ON(TLB_MASK_TABLE_OFS(0) < -(1 << 11));
static void tcg_out_tlb_load(TCGContext *s, TCGReg addrl,
TCGReg addrh, TCGMemOpIdx oi,
tcg_insn_unit **label_ptr, bool is_load)
{
MemOp opc = get_memop(oi);
unsigned s_bits = opc & MO_SIZE;
unsigned a_bits = get_alignment_bits(opc);
tcg_target_long compare_mask;
int mem_index = get_mmuidx(oi);
int fast_ofs = TLB_MASK_TABLE_OFS(mem_index);
int mask_ofs = fast_ofs + offsetof(CPUTLBDescFast, mask);
int table_ofs = fast_ofs + offsetof(CPUTLBDescFast, table);
TCGReg mask_base = TCG_AREG0, table_base = TCG_AREG0;
tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_TMP0, mask_base, mask_ofs);
tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_TMP1, table_base, table_ofs);
tcg_out_opc_imm(s, OPC_SRLI, TCG_REG_TMP2, addrl,
TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS);
tcg_out_opc_reg(s, OPC_AND, TCG_REG_TMP2, TCG_REG_TMP2, TCG_REG_TMP0);
tcg_out_opc_reg(s, OPC_ADD, TCG_REG_TMP2, TCG_REG_TMP2, TCG_REG_TMP1);
/* Load the tlb comparator and the addend. */
tcg_out_ld(s, TCG_TYPE_TL, TCG_REG_TMP0, TCG_REG_TMP2,
is_load ? offsetof(CPUTLBEntry, addr_read)
: offsetof(CPUTLBEntry, addr_write));
tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_TMP2, TCG_REG_TMP2,
offsetof(CPUTLBEntry, addend));
/* We don't support unaligned accesses. */
if (a_bits < s_bits) {
a_bits = s_bits;
}
/* Clear the non-page, non-alignment bits from the address. */
compare_mask = (tcg_target_long)TARGET_PAGE_MASK | ((1 << a_bits) - 1);
if (compare_mask == sextreg(compare_mask, 0, 12)) {
tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_TMP1, addrl, compare_mask);
} else {
tcg_out_movi(s, TCG_TYPE_TL, TCG_REG_TMP1, compare_mask);
tcg_out_opc_reg(s, OPC_AND, TCG_REG_TMP1, TCG_REG_TMP1, addrl);
}
/* Compare masked address with the TLB entry. */
label_ptr[0] = s->code_ptr;
tcg_out_opc_branch(s, OPC_BNE, TCG_REG_TMP0, TCG_REG_TMP1, 0);
/* NOP to allow patching later */
tcg_out_opc_imm(s, OPC_ADDI, TCG_REG_ZERO, TCG_REG_ZERO, 0);
/* TLB Hit - translate address using addend. */
if (TCG_TARGET_REG_BITS > TARGET_LONG_BITS) {
tcg_out_ext32u(s, TCG_REG_TMP0, addrl);
addrl = TCG_REG_TMP0;
}
tcg_out_opc_reg(s, OPC_ADD, TCG_REG_TMP0, TCG_REG_TMP2, addrl);
}
static void add_qemu_ldst_label(TCGContext *s, int is_ld, TCGMemOpIdx oi,
TCGType ext,
TCGReg datalo, TCGReg datahi,
TCGReg addrlo, TCGReg addrhi,
void *raddr, tcg_insn_unit **label_ptr)
{
TCGLabelQemuLdst *label = new_ldst_label(s);
label->is_ld = is_ld;
label->oi = oi;
label->type = ext;
label->datalo_reg = datalo;
label->datahi_reg = datahi;
label->addrlo_reg = addrlo;
label->addrhi_reg = addrhi;
label->raddr = raddr;
label->label_ptr[0] = label_ptr[0];
}
static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
TCGMemOpIdx oi = l->oi;
MemOp opc = get_memop(oi);
TCGReg a0 = tcg_target_call_iarg_regs[0];
TCGReg a1 = tcg_target_call_iarg_regs[1];
TCGReg a2 = tcg_target_call_iarg_regs[2];
TCGReg a3 = tcg_target_call_iarg_regs[3];
/* We don't support oversize guests */
if (TCG_TARGET_REG_BITS < TARGET_LONG_BITS) {
g_assert_not_reached();
}
/* resolve label address */
if (!patch_reloc(l->label_ptr[0], R_RISCV_BRANCH,
(intptr_t) s->code_ptr, 0)) {
return false;
}
/* call load helper */
tcg_out_mov(s, TCG_TYPE_PTR, a0, TCG_AREG0);
tcg_out_mov(s, TCG_TYPE_PTR, a1, l->addrlo_reg);
tcg_out_movi(s, TCG_TYPE_PTR, a2, oi);
tcg_out_movi(s, TCG_TYPE_PTR, a3, (tcg_target_long)l->raddr);
tcg_out_call(s, qemu_ld_helpers[opc & (MO_BSWAP | MO_SSIZE)]);
tcg_out_mov(s, (opc & MO_SIZE) == MO_64, l->datalo_reg, a0);
tcg_out_goto(s, l->raddr);
return true;
}
static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
TCGMemOpIdx oi = l->oi;
MemOp opc = get_memop(oi);
MemOp s_bits = opc & MO_SIZE;
TCGReg a0 = tcg_target_call_iarg_regs[0];
TCGReg a1 = tcg_target_call_iarg_regs[1];
TCGReg a2 = tcg_target_call_iarg_regs[2];
TCGReg a3 = tcg_target_call_iarg_regs[3];
TCGReg a4 = tcg_target_call_iarg_regs[4];
/* We don't support oversize guests */
if (TCG_TARGET_REG_BITS < TARGET_LONG_BITS) {
g_assert_not_reached();
}
/* resolve label address */
if (!patch_reloc(l->label_ptr[0], R_RISCV_BRANCH,
(intptr_t) s->code_ptr, 0)) {
return false;
}
/* call store helper */
tcg_out_mov(s, TCG_TYPE_PTR, a0, TCG_AREG0);
tcg_out_mov(s, TCG_TYPE_PTR, a1, l->addrlo_reg);
tcg_out_mov(s, TCG_TYPE_PTR, a2, l->datalo_reg);
switch (s_bits) {
case MO_8:
tcg_out_ext8u(s, a2, a2);
break;
case MO_16:
tcg_out_ext16u(s, a2, a2);
break;
default:
break;
}
tcg_out_movi(s, TCG_TYPE_PTR, a3, oi);
tcg_out_movi(s, TCG_TYPE_PTR, a4, (tcg_target_long)l->raddr);
tcg_out_call(s, qemu_st_helpers[opc & (MO_BSWAP | MO_SSIZE)]);
tcg_out_goto(s, l->raddr);
return true;
}
#endif /* CONFIG_SOFTMMU */
static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg lo, TCGReg hi,
TCGReg base, MemOp opc, bool is_64)
{
const MemOp bswap = opc & MO_BSWAP;
/* We don't yet handle byteswapping, assert */
g_assert(!bswap);
switch (opc & (MO_SSIZE)) {
case MO_UB:
tcg_out_opc_imm(s, OPC_LBU, lo, base, 0);
break;
case MO_SB:
tcg_out_opc_imm(s, OPC_LB, lo, base, 0);
break;
case MO_UW:
tcg_out_opc_imm(s, OPC_LHU, lo, base, 0);
break;
case MO_SW:
tcg_out_opc_imm(s, OPC_LH, lo, base, 0);
break;
case MO_UL:
if (TCG_TARGET_REG_BITS == 64 && is_64) {
tcg_out_opc_imm(s, OPC_LWU, lo, base, 0);
break;
}
/* FALLTHRU */
case MO_SL:
tcg_out_opc_imm(s, OPC_LW, lo, base, 0);
break;
case MO_Q:
/* Prefer to load from offset 0 first, but allow for overlap. */
if (TCG_TARGET_REG_BITS == 64) {
tcg_out_opc_imm(s, OPC_LD, lo, base, 0);
} else if (lo != base) {
tcg_out_opc_imm(s, OPC_LW, lo, base, 0);
tcg_out_opc_imm(s, OPC_LW, hi, base, 4);
} else {
tcg_out_opc_imm(s, OPC_LW, hi, base, 4);
tcg_out_opc_imm(s, OPC_LW, lo, base, 0);
}
break;
default:
g_assert_not_reached();
}
}
static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, bool is_64)
{
TCGReg addr_regl, addr_regh __attribute__((unused));
TCGReg data_regl, data_regh;
TCGMemOpIdx oi;
MemOp opc;
#if defined(CONFIG_SOFTMMU)
tcg_insn_unit *label_ptr[1];
#endif
TCGReg base = TCG_REG_TMP0;
data_regl = *args++;
data_regh = (TCG_TARGET_REG_BITS == 32 && is_64 ? *args++ : 0);
addr_regl = *args++;
addr_regh = (TCG_TARGET_REG_BITS < TARGET_LONG_BITS ? *args++ : 0);
oi = *args++;
opc = get_memop(oi);
#if defined(CONFIG_SOFTMMU)
tcg_out_tlb_load(s, addr_regl, addr_regh, oi, label_ptr, 1);
tcg_out_qemu_ld_direct(s, data_regl, data_regh, base, opc, is_64);
add_qemu_ldst_label(s, 1, oi,
(is_64 ? TCG_TYPE_I64 : TCG_TYPE_I32),
data_regl, data_regh, addr_regl, addr_regh,
s->code_ptr, label_ptr);
#else
if (TCG_TARGET_REG_BITS > TARGET_LONG_BITS) {
tcg_out_ext32u(s, base, addr_regl);
addr_regl = base;
}
if (guest_base == 0) {
tcg_out_opc_reg(s, OPC_ADD, base, addr_regl, TCG_REG_ZERO);
} else {
tcg_out_opc_reg(s, OPC_ADD, base, TCG_GUEST_BASE_REG, addr_regl);
}
tcg_out_qemu_ld_direct(s, data_regl, data_regh, base, opc, is_64);
#endif
}
static void tcg_out_qemu_st_direct(TCGContext *s, TCGReg lo, TCGReg hi,
TCGReg base, MemOp opc)
{
const MemOp bswap = opc & MO_BSWAP;
/* We don't yet handle byteswapping, assert */
g_assert(!bswap);
switch (opc & (MO_SSIZE)) {
case MO_8:
tcg_out_opc_store(s, OPC_SB, base, lo, 0);
break;
case MO_16:
tcg_out_opc_store(s, OPC_SH, base, lo, 0);
break;
case MO_32:
tcg_out_opc_store(s, OPC_SW, base, lo, 0);
break;
case MO_64:
if (TCG_TARGET_REG_BITS == 64) {
tcg_out_opc_store(s, OPC_SD, base, lo, 0);
} else {
tcg_out_opc_store(s, OPC_SW, base, lo, 0);
tcg_out_opc_store(s, OPC_SW, base, hi, 4);
}
break;
default:
g_assert_not_reached();
}
}
static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is_64)
{
TCGReg addr_regl, addr_regh __attribute__((unused));
TCGReg data_regl, data_regh;
TCGMemOpIdx oi;
MemOp opc;
#if defined(CONFIG_SOFTMMU)
tcg_insn_unit *label_ptr[1];
#endif
TCGReg base = TCG_REG_TMP0;
data_regl = *args++;
data_regh = (TCG_TARGET_REG_BITS == 32 && is_64 ? *args++ : 0);
addr_regl = *args++;
addr_regh = (TCG_TARGET_REG_BITS < TARGET_LONG_BITS ? *args++ : 0);
oi = *args++;
opc = get_memop(oi);
#if defined(CONFIG_SOFTMMU)
tcg_out_tlb_load(s, addr_regl, addr_regh, oi, label_ptr, 0);
tcg_out_qemu_st_direct(s, data_regl, data_regh, base, opc);
add_qemu_ldst_label(s, 0, oi,
(is_64 ? TCG_TYPE_I64 : TCG_TYPE_I32),
data_regl, data_regh, addr_regl, addr_regh,
s->code_ptr, label_ptr);
#else
if (TCG_TARGET_REG_BITS > TARGET_LONG_BITS) {
tcg_out_ext32u(s, base, addr_regl);
addr_regl = base;
}
if (guest_base == 0) {
tcg_out_opc_reg(s, OPC_ADD, base, addr_regl, TCG_REG_ZERO);
} else {
tcg_out_opc_reg(s, OPC_ADD, base, TCG_GUEST_BASE_REG, addr_regl);
}
tcg_out_qemu_st_direct(s, data_regl, data_regh, base, opc);
#endif
}
static tcg_insn_unit *tb_ret_addr;
static void tcg_out_op(TCGContext *s, TCGOpcode opc,
const TCGArg *args, const int *const_args)
{
TCGArg a0 = args[0];
TCGArg a1 = args[1];
TCGArg a2 = args[2];
int c2 = const_args[2];
switch (opc) {
case INDEX_op_exit_tb:
/* Reuse the zeroing that exists for goto_ptr. */
if (a0 == 0) {
tcg_out_call_int(s, s->code_gen_epilogue, true);
} else {
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_A0, a0);
tcg_out_call_int(s, tb_ret_addr, true);
}
break;
case INDEX_op_goto_tb:
assert(s->tb_jmp_insn_offset == 0);
/* indirect jump method */
tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_TMP0, TCG_REG_ZERO,
(uintptr_t)(s->tb_jmp_target_addr + a0));
tcg_out_opc_imm(s, OPC_JALR, TCG_REG_ZERO, TCG_REG_TMP0, 0);
set_jmp_reset_offset(s, a0);
break;
case INDEX_op_goto_ptr:
tcg_out_opc_imm(s, OPC_JALR, TCG_REG_ZERO, a0, 0);
break;
case INDEX_op_br:
tcg_out_reloc(s, s->code_ptr, R_RISCV_JAL, arg_label(a0), 0);
tcg_out_opc_jump(s, OPC_JAL, TCG_REG_ZERO, 0);
break;
case INDEX_op_ld8u_i32:
case INDEX_op_ld8u_i64:
tcg_out_ldst(s, OPC_LBU, a0, a1, a2);
break;
case INDEX_op_ld8s_i32:
case INDEX_op_ld8s_i64:
tcg_out_ldst(s, OPC_LB, a0, a1, a2);
break;
case INDEX_op_ld16u_i32:
case INDEX_op_ld16u_i64:
tcg_out_ldst(s, OPC_LHU, a0, a1, a2);
break;
case INDEX_op_ld16s_i32:
case INDEX_op_ld16s_i64:
tcg_out_ldst(s, OPC_LH, a0, a1, a2);
break;
case INDEX_op_ld32u_i64:
tcg_out_ldst(s, OPC_LWU, a0, a1, a2);
break;
case INDEX_op_ld_i32:
case INDEX_op_ld32s_i64:
tcg_out_ldst(s, OPC_LW, a0, a1, a2);
break;
case INDEX_op_ld_i64:
tcg_out_ldst(s, OPC_LD, a0, a1, a2);
break;
case INDEX_op_st8_i32:
case INDEX_op_st8_i64:
tcg_out_ldst(s, OPC_SB, a0, a1, a2);
break;
case INDEX_op_st16_i32:
case INDEX_op_st16_i64:
tcg_out_ldst(s, OPC_SH, a0, a1, a2);
break;
case INDEX_op_st_i32:
case INDEX_op_st32_i64:
tcg_out_ldst(s, OPC_SW, a0, a1, a2);
break;
case INDEX_op_st_i64:
tcg_out_ldst(s, OPC_SD, a0, a1, a2);
break;
case INDEX_op_add_i32:
if (c2) {
tcg_out_opc_imm(s, OPC_ADDIW, a0, a1, a2);
} else {
tcg_out_opc_reg(s, OPC_ADDW, a0, a1, a2);
}
break;
case INDEX_op_add_i64:
if (c2) {
tcg_out_opc_imm(s, OPC_ADDI, a0, a1, a2);
} else {
tcg_out_opc_reg(s, OPC_ADD, a0, a1, a2);
}
break;
case INDEX_op_sub_i32:
if (c2) {
tcg_out_opc_imm(s, OPC_ADDIW, a0, a1, -a2);
} else {
tcg_out_opc_reg(s, OPC_SUBW, a0, a1, a2);
}
break;
case INDEX_op_sub_i64:
if (c2) {
tcg_out_opc_imm(s, OPC_ADDI, a0, a1, -a2);
} else {
tcg_out_opc_reg(s, OPC_SUB, a0, a1, a2);
}
break;
case INDEX_op_and_i32:
case INDEX_op_and_i64:
if (c2) {
tcg_out_opc_imm(s, OPC_ANDI, a0, a1, a2);
} else {
tcg_out_opc_reg(s, OPC_AND, a0, a1, a2);
}
break;
case INDEX_op_or_i32:
case INDEX_op_or_i64:
if (c2) {
tcg_out_opc_imm(s, OPC_ORI, a0, a1, a2);
} else {
tcg_out_opc_reg(s, OPC_OR, a0, a1, a2);
}
break;
case INDEX_op_xor_i32:
case INDEX_op_xor_i64:
if (c2) {
tcg_out_opc_imm(s, OPC_XORI, a0, a1, a2);
} else {
tcg_out_opc_reg(s, OPC_XOR, a0, a1, a2);
}
break;
case INDEX_op_not_i32:
case INDEX_op_not_i64:
tcg_out_opc_imm(s, OPC_XORI, a0, a1, -1);
break;
case INDEX_op_neg_i32:
tcg_out_opc_reg(s, OPC_SUBW, a0, TCG_REG_ZERO, a1);
break;
case INDEX_op_neg_i64:
tcg_out_opc_reg(s, OPC_SUB, a0, TCG_REG_ZERO, a1);
break;
case INDEX_op_mul_i32:
tcg_out_opc_reg(s, OPC_MULW, a0, a1, a2);
break;
case INDEX_op_mul_i64:
tcg_out_opc_reg(s, OPC_MUL, a0, a1, a2);
break;
case INDEX_op_div_i32:
tcg_out_opc_reg(s, OPC_DIVW, a0, a1, a2);
break;
case INDEX_op_div_i64:
tcg_out_opc_reg(s, OPC_DIV, a0, a1, a2);
break;
case INDEX_op_divu_i32:
tcg_out_opc_reg(s, OPC_DIVUW, a0, a1, a2);
break;
case INDEX_op_divu_i64:
tcg_out_opc_reg(s, OPC_DIVU, a0, a1, a2);
break;
case INDEX_op_rem_i32:
tcg_out_opc_reg(s, OPC_REMW, a0, a1, a2);
break;
case INDEX_op_rem_i64:
tcg_out_opc_reg(s, OPC_REM, a0, a1, a2);
break;
case INDEX_op_remu_i32:
tcg_out_opc_reg(s, OPC_REMUW, a0, a1, a2);
break;
case INDEX_op_remu_i64:
tcg_out_opc_reg(s, OPC_REMU, a0, a1, a2);
break;
case INDEX_op_shl_i32:
if (c2) {
tcg_out_opc_imm(s, OPC_SLLIW, a0, a1, a2 & 0x1f);
} else {
tcg_out_opc_reg(s, OPC_SLLW, a0, a1, a2);
}
break;
case INDEX_op_shl_i64:
if (c2) {
tcg_out_opc_imm(s, OPC_SLLI, a0, a1, a2 & 0x3f);
} else {
tcg_out_opc_reg(s, OPC_SLL, a0, a1, a2);
}
break;
case INDEX_op_shr_i32:
if (c2) {
tcg_out_opc_imm(s, OPC_SRLIW, a0, a1, a2 & 0x1f);
} else {
tcg_out_opc_reg(s, OPC_SRLW, a0, a1, a2);
}
break;
case INDEX_op_shr_i64:
if (c2) {
tcg_out_opc_imm(s, OPC_SRLI, a0, a1, a2 & 0x3f);
} else {
tcg_out_opc_reg(s, OPC_SRL, a0, a1, a2);
}
break;
case INDEX_op_sar_i32:
if (c2) {
tcg_out_opc_imm(s, OPC_SRAIW, a0, a1, a2 & 0x1f);
} else {
tcg_out_opc_reg(s, OPC_SRAW, a0, a1, a2);
}
break;
case INDEX_op_sar_i64:
if (c2) {
tcg_out_opc_imm(s, OPC_SRAI, a0, a1, a2 & 0x3f);
} else {
tcg_out_opc_reg(s, OPC_SRA, a0, a1, a2);
}
break;
case INDEX_op_add2_i32:
tcg_out_addsub2(s, a0, a1, a2, args[3], args[4], args[5],
const_args[4], const_args[5], false, true);
break;
case INDEX_op_add2_i64:
tcg_out_addsub2(s, a0, a1, a2, args[3], args[4], args[5],
const_args[4], const_args[5], false, false);
break;
case INDEX_op_sub2_i32:
tcg_out_addsub2(s, a0, a1, a2, args[3], args[4], args[5],
const_args[4], const_args[5], true, true);
break;
case INDEX_op_sub2_i64:
tcg_out_addsub2(s, a0, a1, a2, args[3], args[4], args[5],
const_args[4], const_args[5], true, false);
break;
case INDEX_op_brcond_i32:
case INDEX_op_brcond_i64:
tcg_out_brcond(s, a2, a0, a1, arg_label(args[3]));
break;
case INDEX_op_brcond2_i32:
tcg_out_brcond2(s, args[4], a0, a1, a2, args[3], arg_label(args[5]));
break;
case INDEX_op_setcond_i32:
case INDEX_op_setcond_i64:
tcg_out_setcond(s, args[3], a0, a1, a2);
break;
case INDEX_op_setcond2_i32:
tcg_out_setcond2(s, args[5], a0, a1, a2, args[3], args[4]);
break;
case INDEX_op_qemu_ld_i32:
tcg_out_qemu_ld(s, args, false);
break;
case INDEX_op_qemu_ld_i64:
tcg_out_qemu_ld(s, args, true);
break;
case INDEX_op_qemu_st_i32:
tcg_out_qemu_st(s, args, false);
break;
case INDEX_op_qemu_st_i64:
tcg_out_qemu_st(s, args, true);
break;
case INDEX_op_ext8u_i32:
case INDEX_op_ext8u_i64:
tcg_out_ext8u(s, a0, a1);
break;
case INDEX_op_ext16u_i32:
case INDEX_op_ext16u_i64:
tcg_out_ext16u(s, a0, a1);
break;
case INDEX_op_ext32u_i64:
case INDEX_op_extu_i32_i64:
tcg_out_ext32u(s, a0, a1);
break;
case INDEX_op_ext8s_i32:
case INDEX_op_ext8s_i64:
tcg_out_ext8s(s, a0, a1);
break;
case INDEX_op_ext16s_i32:
case INDEX_op_ext16s_i64:
tcg_out_ext16s(s, a0, a1);
break;
case INDEX_op_ext32s_i64:
case INDEX_op_extrl_i64_i32:
case INDEX_op_ext_i32_i64:
tcg_out_ext32s(s, a0, a1);
break;
case INDEX_op_extrh_i64_i32:
tcg_out_opc_imm(s, OPC_SRAI, a0, a1, 32);
break;
case INDEX_op_mulsh_i32:
case INDEX_op_mulsh_i64:
tcg_out_opc_reg(s, OPC_MULH, a0, a1, a2);
break;
case INDEX_op_muluh_i32:
case INDEX_op_muluh_i64:
tcg_out_opc_reg(s, OPC_MULHU, a0, a1, a2);
break;
case INDEX_op_mb:
tcg_out_mb(s, a0);
break;
case INDEX_op_mov_i32: /* Always emitted via tcg_out_mov. */
case INDEX_op_mov_i64:
case INDEX_op_movi_i32: /* Always emitted via tcg_out_movi. */
case INDEX_op_movi_i64:
case INDEX_op_call: /* Always emitted via tcg_out_call. */
default:
g_assert_not_reached();
}
}
static const TCGTargetOpDef *tcg_target_op_def(TCGOpcode op)
{
static const TCGTargetOpDef r
= { .args_ct_str = { "r" } };
static const TCGTargetOpDef r_r
= { .args_ct_str = { "r", "r" } };
static const TCGTargetOpDef rZ_r
= { .args_ct_str = { "rZ", "r" } };
static const TCGTargetOpDef rZ_rZ
= { .args_ct_str = { "rZ", "rZ" } };
static const TCGTargetOpDef rZ_rZ_rZ_rZ
= { .args_ct_str = { "rZ", "rZ", "rZ", "rZ" } };
static const TCGTargetOpDef r_r_ri
= { .args_ct_str = { "r", "r", "ri" } };
static const TCGTargetOpDef r_r_rI
= { .args_ct_str = { "r", "r", "rI" } };
static const TCGTargetOpDef r_rZ_rN
= { .args_ct_str = { "r", "rZ", "rN" } };
static const TCGTargetOpDef r_rZ_rZ
= { .args_ct_str = { "r", "rZ", "rZ" } };
static const TCGTargetOpDef r_rZ_rZ_rZ_rZ
= { .args_ct_str = { "r", "rZ", "rZ", "rZ", "rZ" } };
static const TCGTargetOpDef r_L
= { .args_ct_str = { "r", "L" } };
static const TCGTargetOpDef r_r_L
= { .args_ct_str = { "r", "r", "L" } };
static const TCGTargetOpDef r_L_L
= { .args_ct_str = { "r", "L", "L" } };
static const TCGTargetOpDef r_r_L_L
= { .args_ct_str = { "r", "r", "L", "L" } };
static const TCGTargetOpDef LZ_L
= { .args_ct_str = { "LZ", "L" } };
static const TCGTargetOpDef LZ_L_L
= { .args_ct_str = { "LZ", "L", "L" } };
static const TCGTargetOpDef LZ_LZ_L
= { .args_ct_str = { "LZ", "LZ", "L" } };
static const TCGTargetOpDef LZ_LZ_L_L
= { .args_ct_str = { "LZ", "LZ", "L", "L" } };
static const TCGTargetOpDef r_r_rZ_rZ_rM_rM
= { .args_ct_str = { "r", "r", "rZ", "rZ", "rM", "rM" } };
switch (op) {
case INDEX_op_goto_ptr:
return &r;
case INDEX_op_ld8u_i32:
case INDEX_op_ld8s_i32:
case INDEX_op_ld16u_i32:
case INDEX_op_ld16s_i32:
case INDEX_op_ld_i32:
case INDEX_op_not_i32:
case INDEX_op_neg_i32:
case INDEX_op_ld8u_i64:
case INDEX_op_ld8s_i64:
case INDEX_op_ld16u_i64:
case INDEX_op_ld16s_i64:
case INDEX_op_ld32s_i64:
case INDEX_op_ld32u_i64:
case INDEX_op_ld_i64:
case INDEX_op_not_i64:
case INDEX_op_neg_i64:
case INDEX_op_ext8u_i32:
case INDEX_op_ext8u_i64:
case INDEX_op_ext16u_i32:
case INDEX_op_ext16u_i64:
case INDEX_op_ext32u_i64:
case INDEX_op_extu_i32_i64:
case INDEX_op_ext8s_i32:
case INDEX_op_ext8s_i64:
case INDEX_op_ext16s_i32:
case INDEX_op_ext16s_i64:
case INDEX_op_ext32s_i64:
case INDEX_op_extrl_i64_i32:
case INDEX_op_extrh_i64_i32:
case INDEX_op_ext_i32_i64:
return &r_r;
case INDEX_op_st8_i32:
case INDEX_op_st16_i32:
case INDEX_op_st_i32:
case INDEX_op_st8_i64:
case INDEX_op_st16_i64:
case INDEX_op_st32_i64:
case INDEX_op_st_i64:
return &rZ_r;
case INDEX_op_add_i32:
case INDEX_op_and_i32:
case INDEX_op_or_i32:
case INDEX_op_xor_i32:
case INDEX_op_add_i64:
case INDEX_op_and_i64:
case INDEX_op_or_i64:
case INDEX_op_xor_i64:
return &r_r_rI;
case INDEX_op_sub_i32:
case INDEX_op_sub_i64:
return &r_rZ_rN;
case INDEX_op_mul_i32:
case INDEX_op_mulsh_i32:
case INDEX_op_muluh_i32:
case INDEX_op_div_i32:
case INDEX_op_divu_i32:
case INDEX_op_rem_i32:
case INDEX_op_remu_i32:
case INDEX_op_setcond_i32:
case INDEX_op_mul_i64:
case INDEX_op_mulsh_i64:
case INDEX_op_muluh_i64:
case INDEX_op_div_i64:
case INDEX_op_divu_i64:
case INDEX_op_rem_i64:
case INDEX_op_remu_i64:
case INDEX_op_setcond_i64:
return &r_rZ_rZ;
case INDEX_op_shl_i32:
case INDEX_op_shr_i32:
case INDEX_op_sar_i32:
case INDEX_op_shl_i64:
case INDEX_op_shr_i64:
case INDEX_op_sar_i64:
return &r_r_ri;
case INDEX_op_brcond_i32:
case INDEX_op_brcond_i64:
return &rZ_rZ;
case INDEX_op_add2_i32:
case INDEX_op_add2_i64:
case INDEX_op_sub2_i32:
case INDEX_op_sub2_i64:
return &r_r_rZ_rZ_rM_rM;
case INDEX_op_brcond2_i32:
return &rZ_rZ_rZ_rZ;
case INDEX_op_setcond2_i32:
return &r_rZ_rZ_rZ_rZ;
case INDEX_op_qemu_ld_i32:
return TARGET_LONG_BITS <= TCG_TARGET_REG_BITS ? &r_L : &r_L_L;
case INDEX_op_qemu_st_i32:
return TARGET_LONG_BITS <= TCG_TARGET_REG_BITS ? &LZ_L : &LZ_L_L;
case INDEX_op_qemu_ld_i64:
return TCG_TARGET_REG_BITS == 64 ? &r_L
: TARGET_LONG_BITS <= TCG_TARGET_REG_BITS ? &r_r_L
: &r_r_L_L;
case INDEX_op_qemu_st_i64:
return TCG_TARGET_REG_BITS == 64 ? &LZ_L
: TARGET_LONG_BITS <= TCG_TARGET_REG_BITS ? &LZ_LZ_L
: &LZ_LZ_L_L;
default:
return NULL;
}
}
static const int tcg_target_callee_save_regs[] = {
TCG_REG_S0, /* used for the global env (TCG_AREG0) */
TCG_REG_S1,
TCG_REG_S2,
TCG_REG_S3,
TCG_REG_S4,
TCG_REG_S5,
TCG_REG_S6,
TCG_REG_S7,
TCG_REG_S8,
TCG_REG_S9,
TCG_REG_S10,
TCG_REG_S11,
TCG_REG_RA, /* should be last for ABI compliance */
};
/* Stack frame parameters. */
#define REG_SIZE (TCG_TARGET_REG_BITS / 8)
#define SAVE_SIZE ((int)ARRAY_SIZE(tcg_target_callee_save_regs) * REG_SIZE)
#define TEMP_SIZE (CPU_TEMP_BUF_NLONGS * (int)sizeof(long))
#define FRAME_SIZE ((TCG_STATIC_CALL_ARGS_SIZE + TEMP_SIZE + SAVE_SIZE \
+ TCG_TARGET_STACK_ALIGN - 1) \
& -TCG_TARGET_STACK_ALIGN)
#define SAVE_OFS (TCG_STATIC_CALL_ARGS_SIZE + TEMP_SIZE)
/* We're expecting to be able to use an immediate for frame allocation. */
QEMU_BUILD_BUG_ON(FRAME_SIZE > 0x7ff);
/* Generate global QEMU prologue and epilogue code */
static void tcg_target_qemu_prologue(TCGContext *s)
{
int i;
tcg_set_frame(s, TCG_REG_SP, TCG_STATIC_CALL_ARGS_SIZE, TEMP_SIZE);
/* TB prologue */
tcg_out_opc_imm(s, OPC_ADDI, TCG_REG_SP, TCG_REG_SP, -FRAME_SIZE);
for (i = 0; i < ARRAY_SIZE(tcg_target_callee_save_regs); i++) {
tcg_out_st(s, TCG_TYPE_REG, tcg_target_callee_save_regs[i],
TCG_REG_SP, SAVE_OFS + i * REG_SIZE);
}
#if !defined(CONFIG_SOFTMMU)
tcg_out_movi(s, TCG_TYPE_PTR, TCG_GUEST_BASE_REG, guest_base);
tcg_regset_set_reg(s->reserved_regs, TCG_GUEST_BASE_REG);
#endif
/* Call generated code */
tcg_out_mov(s, TCG_TYPE_PTR, TCG_AREG0, tcg_target_call_iarg_regs[0]);
tcg_out_opc_imm(s, OPC_JALR, TCG_REG_ZERO, tcg_target_call_iarg_regs[1], 0);
/* Return path for goto_ptr. Set return value to 0 */
s->code_gen_epilogue = s->code_ptr;
tcg_out_mov(s, TCG_TYPE_REG, TCG_REG_A0, TCG_REG_ZERO);
/* TB epilogue */
tb_ret_addr = s->code_ptr;
for (i = 0; i < ARRAY_SIZE(tcg_target_callee_save_regs); i++) {
tcg_out_ld(s, TCG_TYPE_REG, tcg_target_callee_save_regs[i],
TCG_REG_SP, SAVE_OFS + i * REG_SIZE);
}
tcg_out_opc_imm(s, OPC_ADDI, TCG_REG_SP, TCG_REG_SP, FRAME_SIZE);
tcg_out_opc_imm(s, OPC_JALR, TCG_REG_ZERO, TCG_REG_RA, 0);
}
static void tcg_target_init(TCGContext *s)
{
tcg_target_available_regs[TCG_TYPE_I32] = 0xffffffff;
if (TCG_TARGET_REG_BITS == 64) {
tcg_target_available_regs[TCG_TYPE_I64] = 0xffffffff;
}
tcg_target_call_clobber_regs = -1u;
tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S0);
tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S1);
tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S2);
tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S3);
tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S4);
tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S5);
tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S6);
tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S7);
tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S8);
tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S9);
tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S10);
tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S11);
s->reserved_regs = 0;
tcg_regset_set_reg(s->reserved_regs, TCG_REG_ZERO);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_TMP0);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_TMP1);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_TMP2);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_SP);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_GP);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_TP);
}
typedef struct {
DebugFrameHeader h;
uint8_t fde_def_cfa[4];
uint8_t fde_reg_ofs[ARRAY_SIZE(tcg_target_callee_save_regs) * 2];
} DebugFrame;
#define ELF_HOST_MACHINE EM_RISCV
static const DebugFrame debug_frame = {
.h.cie.len = sizeof(DebugFrameCIE) - 4, /* length after .len member */
.h.cie.id = -1,
.h.cie.version = 1,
.h.cie.code_align = 1,
.h.cie.data_align = -(TCG_TARGET_REG_BITS / 8) & 0x7f, /* sleb128 */
.h.cie.return_column = TCG_REG_RA,
/* Total FDE size does not include the "len" member. */
.h.fde.len = sizeof(DebugFrame) - offsetof(DebugFrame, h.fde.cie_offset),
.fde_def_cfa = {
12, TCG_REG_SP, /* DW_CFA_def_cfa sp, ... */
(FRAME_SIZE & 0x7f) | 0x80, /* ... uleb128 FRAME_SIZE */
(FRAME_SIZE >> 7)
},
.fde_reg_ofs = {
0x80 + 9, 12, /* DW_CFA_offset, s1, -96 */
0x80 + 18, 11, /* DW_CFA_offset, s2, -88 */
0x80 + 19, 10, /* DW_CFA_offset, s3, -80 */
0x80 + 20, 9, /* DW_CFA_offset, s4, -72 */
0x80 + 21, 8, /* DW_CFA_offset, s5, -64 */
0x80 + 22, 7, /* DW_CFA_offset, s6, -56 */
0x80 + 23, 6, /* DW_CFA_offset, s7, -48 */
0x80 + 24, 5, /* DW_CFA_offset, s8, -40 */
0x80 + 25, 4, /* DW_CFA_offset, s9, -32 */
0x80 + 26, 3, /* DW_CFA_offset, s10, -24 */
0x80 + 27, 2, /* DW_CFA_offset, s11, -16 */
0x80 + 1 , 1, /* DW_CFA_offset, ra, -8 */
}
};
void tcg_register_jit(void *buf, size_t buf_size)
{
tcg_register_jit_int(buf, buf_size, &debug_frame, sizeof(debug_frame));
}
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