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709bcd7da3
qemu/tcg/loongarch64/tcg-target.c.inc
Richard Henderson 709bcd7da3 tcg/loongarch64: Reorg goto_tb implementation 
The old implementation replaces two insns, swapping between

        b       <dest>
        nop
and
        pcaddu18i tmp, <dest>
        jirl      zero, tmp, <dest> & 0xffff

There is a race condition in which a thread could be stopped at
the jirl, i.e. with the top of the address loaded, and when
restarted we have re-linked to a different TB, so that the top
half no longer matches the bottom half.

Note that while we never directly re-link to a different TB, we
can link, unlink, and link again all while the stopped thread
remains stopped.

The new implementation replaces only one insn, swapping between

        b       <dest>
and
        pcadd   tmp, <jmp_addr>

falling through to load the address from tmp, and branch.

Reviewed-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2023-01-23 16:00:13 -10:00

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/*
* Tiny Code Generator for QEMU
*
* Copyright (c) 2021 WANG Xuerui <git@xen0n.name>
*
* Based on tcg/riscv/tcg-target.c.inc
*
* 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
*
* 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-ldst.c.inc"
#ifdef CONFIG_DEBUG_TCG
static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
"zero",
"ra",
"tp",
"sp",
"a0",
"a1",
"a2",
"a3",
"a4",
"a5",
"a6",
"a7",
"t0",
"t1",
"t2",
"t3",
"t4",
"t5",
"t6",
"t7",
"t8",
"r21", /* reserved in the LP64* ABI, hence no ABI name */
"s9",
"s0",
"s1",
"s2",
"s3",
"s4",
"s5",
"s6",
"s7",
"s8"
};
#endif
static const int tcg_target_reg_alloc_order[] = {
/* Registers preserved across calls */
/* TCG_REG_S0 reserved 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,
/* Registers (potentially) clobbered across calls */
TCG_REG_T0,
TCG_REG_T1,
TCG_REG_T2,
TCG_REG_T3,
TCG_REG_T4,
TCG_REG_T5,
TCG_REG_T6,
TCG_REG_T7,
TCG_REG_T8,
/* Argument registers, opposite order of allocation. */
TCG_REG_A7,
TCG_REG_A6,
TCG_REG_A5,
TCG_REG_A4,
TCG_REG_A3,
TCG_REG_A2,
TCG_REG_A1,
TCG_REG_A0,
};
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,
};
#ifndef CONFIG_SOFTMMU
#define USE_GUEST_BASE (guest_base != 0)
#define TCG_GUEST_BASE_REG TCG_REG_S1
#endif
#define TCG_CT_CONST_ZERO 0x100
#define TCG_CT_CONST_S12 0x200
#define TCG_CT_CONST_S32 0x400
#define TCG_CT_CONST_U12 0x800
#define TCG_CT_CONST_C12 0x1000
#define TCG_CT_CONST_WSZ 0x2000
#define ALL_GENERAL_REGS MAKE_64BIT_MASK(0, 32)
/*
* For softmmu, we need to avoid conflicts with the first 5
* argument registers to call the helper. Some of these are
* also used for the tlb lookup.
*/
#ifdef CONFIG_SOFTMMU
#define SOFTMMU_RESERVE_REGS MAKE_64BIT_MASK(TCG_REG_A0, 5)
#else
#define SOFTMMU_RESERVE_REGS 0
#endif
static inline tcg_target_long sextreg(tcg_target_long val, int pos, int len)
{
return sextract64(val, pos, len);
}
/* test if a constant matches the constraint */
static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
{
if (ct & TCG_CT_CONST) {
return true;
}
if ((ct & TCG_CT_CONST_ZERO) && val == 0) {
return true;
}
if ((ct & TCG_CT_CONST_S12) && val == sextreg(val, 0, 12)) {
return true;
}
if ((ct & TCG_CT_CONST_S32) && val == (int32_t)val) {
return true;
}
if ((ct & TCG_CT_CONST_U12) && val >= 0 && val <= 0xfff) {
return true;
}
if ((ct & TCG_CT_CONST_C12) && ~val >= 0 && ~val <= 0xfff) {
return true;
}
if ((ct & TCG_CT_CONST_WSZ) && val == (type == TCG_TYPE_I32 ? 32 : 64)) {
return true;
}
return false;
}
/*
* Relocations
*/
/*
* Relocation records defined in LoongArch ELF psABI v1.00 is way too
* complicated; a whopping stack machine is needed to stuff the fields, at
* the very least one SOP_PUSH and one SOP_POP (of the correct format) are
* needed.
*
* Hence, define our own simpler relocation types. Numbers are chosen as to
* not collide with potential future additions to the true ELF relocation
* type enum.
*/
/* Field Sk16, shifted right by 2; suitable for conditional jumps */
#define R_LOONGARCH_BR_SK16 256
/* Field Sd10k16, shifted right by 2; suitable for B and BL */
#define R_LOONGARCH_BR_SD10K16 257
static bool reloc_br_sk16(tcg_insn_unit *src_rw, const tcg_insn_unit *target)
{
const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw);
intptr_t offset = (intptr_t)target - (intptr_t)src_rx;
tcg_debug_assert((offset & 3) == 0);
offset >>= 2;
if (offset == sextreg(offset, 0, 16)) {
*src_rw = deposit64(*src_rw, 10, 16, offset);
return true;
}
return false;
}
static bool reloc_br_sd10k16(tcg_insn_unit *src_rw,
const tcg_insn_unit *target)
{
const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw);
intptr_t offset = (intptr_t)target - (intptr_t)src_rx;
tcg_debug_assert((offset & 3) == 0);
offset >>= 2;
if (offset == sextreg(offset, 0, 26)) {
*src_rw = deposit64(*src_rw, 0, 10, offset >> 16); /* slot d10 */
*src_rw = deposit64(*src_rw, 10, 16, offset); /* slot k16 */
return true;
}
return false;
}
static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
intptr_t value, intptr_t addend)
{
tcg_debug_assert(addend == 0);
switch (type) {
case R_LOONGARCH_BR_SK16:
return reloc_br_sk16(code_ptr, (tcg_insn_unit *)value);
case R_LOONGARCH_BR_SD10K16:
return reloc_br_sd10k16(code_ptr, (tcg_insn_unit *)value);
default:
g_assert_not_reached();
}
}
#include "tcg-insn-defs.c.inc"
/*
* TCG intrinsics
*/
static void tcg_out_mb(TCGContext *s, TCGArg a0)
{
/* Baseline LoongArch only has the full barrier, unfortunately. */
tcg_out_opc_dbar(s, 0);
}
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:
/*
* Conventional register-register move used in LoongArch is
* `or dst, src, zero`.
*/
tcg_out_opc_or(s, ret, arg, TCG_REG_ZERO);
break;
default:
g_assert_not_reached();
}
return true;
}
/* Loads a 32-bit immediate into rd, sign-extended. */
static void tcg_out_movi_i32(TCGContext *s, TCGReg rd, int32_t val)
{
tcg_target_long lo = sextreg(val, 0, 12);
tcg_target_long hi12 = sextreg(val, 12, 20);
/* Single-instruction cases. */
if (hi12 == 0) {
/* val fits in uimm12: ori rd, zero, val */
tcg_out_opc_ori(s, rd, TCG_REG_ZERO, val);
return;
}
if (hi12 == sextreg(lo, 12, 20)) {
/* val fits in simm12: addi.w rd, zero, val */
tcg_out_opc_addi_w(s, rd, TCG_REG_ZERO, val);
return;
}
/* High bits must be set; load with lu12i.w + optional ori. */
tcg_out_opc_lu12i_w(s, rd, hi12);
if (lo != 0) {
tcg_out_opc_ori(s, rd, rd, lo & 0xfff);
}
}
static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd,
tcg_target_long val)
{
/*
* LoongArch conventionally loads 64-bit immediates in at most 4 steps,
* with dedicated instructions for filling the respective bitfields
* below:
*
* 6 5 4 3
* 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2
* +-----------------------+---------------------------------------+...
* | hi52 | hi32 |
* +-----------------------+---------------------------------------+...
* 3 2 1
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
* ...+-------------------------------------+-------------------------+
* | hi12 | lo |
* ...+-------------------------------------+-------------------------+
*
* Check if val belong to one of the several fast cases, before falling
* back to the slow path.
*/
intptr_t pc_offset;
tcg_target_long val_lo, val_hi, pc_hi, offset_hi;
tcg_target_long hi12, hi32, hi52;
/* Value fits in signed i32. */
if (type == TCG_TYPE_I32 || val == (int32_t)val) {
tcg_out_movi_i32(s, rd, val);
return;
}
/* PC-relative cases. */
pc_offset = tcg_pcrel_diff(s, (void *)val);
if (pc_offset == sextreg(pc_offset, 0, 22) && (pc_offset & 3) == 0) {
/* Single pcaddu2i. */
tcg_out_opc_pcaddu2i(s, rd, pc_offset >> 2);
return;
}
if (pc_offset == (int32_t)pc_offset) {
/* Offset within 32 bits; load with pcalau12i + ori. */
val_lo = sextreg(val, 0, 12);
val_hi = val >> 12;
pc_hi = (val - pc_offset) >> 12;
offset_hi = val_hi - pc_hi;
tcg_debug_assert(offset_hi == sextreg(offset_hi, 0, 20));
tcg_out_opc_pcalau12i(s, rd, offset_hi);
if (val_lo != 0) {
tcg_out_opc_ori(s, rd, rd, val_lo & 0xfff);
}
return;
}
hi12 = sextreg(val, 12, 20);
hi32 = sextreg(val, 32, 20);
hi52 = sextreg(val, 52, 12);
/* Single cu52i.d case. */
if ((hi52 != 0) && (ctz64(val) >= 52)) {
tcg_out_opc_cu52i_d(s, rd, TCG_REG_ZERO, hi52);
return;
}
/* Slow path. Initialize the low 32 bits, then concat high bits. */
tcg_out_movi_i32(s, rd, val);
/* Load hi32 and hi52 explicitly when they are unexpected values. */
if (hi32 != sextreg(hi12, 20, 20)) {
tcg_out_opc_cu32i_d(s, rd, hi32);
}
if (hi52 != sextreg(hi32, 20, 12)) {
tcg_out_opc_cu52i_d(s, rd, rd, hi52);
}
}
static void tcg_out_addi(TCGContext *s, TCGType type, TCGReg rd,
TCGReg rs, tcg_target_long imm)
{
tcg_target_long lo12 = sextreg(imm, 0, 12);
tcg_target_long hi16 = sextreg(imm - lo12, 16, 16);
/*
* Note that there's a hole in between hi16 and lo12:
*
* 3 2 1 0
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
* ...+-------------------------------+-------+-----------------------+
* | hi16 | | lo12 |
* ...+-------------------------------+-------+-----------------------+
*
* For bits within that hole, it's more efficient to use LU12I and ADD.
*/
if (imm == (hi16 << 16) + lo12) {
if (hi16) {
tcg_out_opc_addu16i_d(s, rd, rs, hi16);
rs = rd;
}
if (type == TCG_TYPE_I32) {
tcg_out_opc_addi_w(s, rd, rs, lo12);
} else if (lo12) {
tcg_out_opc_addi_d(s, rd, rs, lo12);
} else {
tcg_out_mov(s, type, rd, rs);
}
} else {
tcg_out_movi(s, type, TCG_REG_TMP0, imm);
if (type == TCG_TYPE_I32) {
tcg_out_opc_add_w(s, rd, rs, TCG_REG_TMP0);
} else {
tcg_out_opc_add_d(s, rd, rs, TCG_REG_TMP0);
}
}
}
static void tcg_out_ext8u(TCGContext *s, TCGReg ret, TCGReg arg)
{
tcg_out_opc_andi(s, ret, arg, 0xff);
}
static void tcg_out_ext16u(TCGContext *s, TCGReg ret, TCGReg arg)
{
tcg_out_opc_bstrpick_w(s, ret, arg, 0, 15);
}
static void tcg_out_ext32u(TCGContext *s, TCGReg ret, TCGReg arg)
{
tcg_out_opc_bstrpick_d(s, ret, arg, 0, 31);
}
static void tcg_out_ext8s(TCGContext *s, TCGReg ret, TCGReg arg)
{
tcg_out_opc_sext_b(s, ret, arg);
}
static void tcg_out_ext16s(TCGContext *s, TCGReg ret, TCGReg arg)
{
tcg_out_opc_sext_h(s, ret, arg);
}
static void tcg_out_ext32s(TCGContext *s, TCGReg ret, TCGReg arg)
{
tcg_out_opc_addi_w(s, ret, arg, 0);
}
static void tcg_out_clzctz(TCGContext *s, LoongArchInsn opc,
TCGReg a0, TCGReg a1, TCGReg a2,
bool c2, bool is_32bit)
{
if (c2) {
/*
* Fast path: semantics already satisfied due to constraint and
* insn behavior, single instruction is enough.
*/
tcg_debug_assert(a2 == (is_32bit ? 32 : 64));
/* all clz/ctz insns belong to DJ-format */
tcg_out32(s, encode_dj_insn(opc, a0, a1));
return;
}
tcg_out32(s, encode_dj_insn(opc, TCG_REG_TMP0, a1));
/* a0 = a1 ? REG_TMP0 : a2 */
tcg_out_opc_maskeqz(s, TCG_REG_TMP0, TCG_REG_TMP0, a1);
tcg_out_opc_masknez(s, a0, a2, a1);
tcg_out_opc_or(s, a0, TCG_REG_TMP0, a0);
}
#define SETCOND_INV TCG_TARGET_NB_REGS
#define SETCOND_NEZ (SETCOND_INV << 1)
#define SETCOND_FLAGS (SETCOND_INV | SETCOND_NEZ)
static int tcg_out_setcond_int(TCGContext *s, TCGCond cond, TCGReg ret,
TCGReg arg1, tcg_target_long arg2, bool c2)
{
int flags = 0;
switch (cond) {
case TCG_COND_EQ: /* -> NE */
case TCG_COND_GE: /* -> LT */
case TCG_COND_GEU: /* -> LTU */
case TCG_COND_GT: /* -> LE */
case TCG_COND_GTU: /* -> LEU */
cond = tcg_invert_cond(cond);
flags ^= SETCOND_INV;
break;
default:
break;
}
switch (cond) {
case TCG_COND_LE:
case TCG_COND_LEU:
/*
* If we have a constant input, the most efficient way to implement
* LE is by adding 1 and using LT. Watch out for wrap around for LEU.
* We don't need to care for this for LE because the constant input
* is still constrained to int32_t, and INT32_MAX+1 is representable
* in the 64-bit temporary register.
*/
if (c2) {
if (cond == TCG_COND_LEU) {
/* unsigned <= -1 is true */
if (arg2 == -1) {
tcg_out_movi(s, TCG_TYPE_REG, ret, !(flags & SETCOND_INV));
return ret;
}
cond = TCG_COND_LTU;
} else {
cond = TCG_COND_LT;
}
arg2 += 1;
} else {
TCGReg tmp = arg2;
arg2 = arg1;
arg1 = tmp;
cond = tcg_swap_cond(cond); /* LE -> GE */
cond = tcg_invert_cond(cond); /* GE -> LT */
flags ^= SETCOND_INV;
}
break;
default:
break;
}
switch (cond) {
case TCG_COND_NE:
flags |= SETCOND_NEZ;
if (!c2) {
tcg_out_opc_xor(s, ret, arg1, arg2);
} else if (arg2 == 0) {
ret = arg1;
} else if (arg2 >= 0 && arg2 <= 0xfff) {
tcg_out_opc_xori(s, ret, arg1, arg2);
} else {
tcg_out_addi(s, TCG_TYPE_REG, ret, arg1, -arg2);
}
break;
case TCG_COND_LT:
case TCG_COND_LTU:
if (c2) {
if (arg2 >= -0x800 && arg2 <= 0x7ff) {
if (cond == TCG_COND_LT) {
tcg_out_opc_slti(s, ret, arg1, arg2);
} else {
tcg_out_opc_sltui(s, ret, arg1, arg2);
}
break;
}
tcg_out_movi(s, TCG_TYPE_REG, TCG_REG_TMP0, arg2);
arg2 = TCG_REG_TMP0;
}
if (cond == TCG_COND_LT) {
tcg_out_opc_slt(s, ret, arg1, arg2);
} else {
tcg_out_opc_sltu(s, ret, arg1, arg2);
}
break;
default:
g_assert_not_reached();
break;
}
return ret | flags;
}
static void tcg_out_setcond(TCGContext *s, TCGCond cond, TCGReg ret,
TCGReg arg1, tcg_target_long arg2, bool c2)
{
int tmpflags = tcg_out_setcond_int(s, cond, ret, arg1, arg2, c2);
if (tmpflags != ret) {
TCGReg tmp = tmpflags & ~SETCOND_FLAGS;
switch (tmpflags & SETCOND_FLAGS) {
case SETCOND_INV:
/* Intermediate result is boolean: simply invert. */
tcg_out_opc_xori(s, ret, tmp, 1);
break;
case SETCOND_NEZ:
/* Intermediate result is zero/non-zero: test != 0. */
tcg_out_opc_sltu(s, ret, TCG_REG_ZERO, tmp);
break;
case SETCOND_NEZ | SETCOND_INV:
/* Intermediate result is zero/non-zero: test == 0. */
tcg_out_opc_sltui(s, ret, tmp, 1);
break;
default:
g_assert_not_reached();
}
}
}
static void tcg_out_movcond(TCGContext *s, TCGCond cond, TCGReg ret,
TCGReg c1, tcg_target_long c2, bool const2,
TCGReg v1, TCGReg v2)
{
int tmpflags = tcg_out_setcond_int(s, cond, TCG_REG_TMP0, c1, c2, const2);
TCGReg t;
/* Standardize the test below to t != 0. */
if (tmpflags & SETCOND_INV) {
t = v1, v1 = v2, v2 = t;
}
t = tmpflags & ~SETCOND_FLAGS;
if (v1 == TCG_REG_ZERO) {
tcg_out_opc_masknez(s, ret, v2, t);
} else if (v2 == TCG_REG_ZERO) {
tcg_out_opc_maskeqz(s, ret, v1, t);
} else {
tcg_out_opc_masknez(s, TCG_REG_TMP2, v2, t); /* t ? 0 : v2 */
tcg_out_opc_maskeqz(s, TCG_REG_TMP1, v1, t); /* t ? v1 : 0 */
tcg_out_opc_or(s, ret, TCG_REG_TMP1, TCG_REG_TMP2);
}
}
/*
* Branch helpers
*/
static const struct {
LoongArchInsn op;
bool swap;
} tcg_brcond_to_loongarch[] = {
[TCG_COND_EQ] = { OPC_BEQ, false },
[TCG_COND_NE] = { OPC_BNE, false },
[TCG_COND_LT] = { OPC_BGT, true },
[TCG_COND_GE] = { OPC_BLE, true },
[TCG_COND_LE] = { OPC_BLE, false },
[TCG_COND_GT] = { OPC_BGT, false },
[TCG_COND_LTU] = { OPC_BGTU, true },
[TCG_COND_GEU] = { OPC_BLEU, true },
[TCG_COND_LEU] = { OPC_BLEU, false },
[TCG_COND_GTU] = { OPC_BGTU, false }
};
static void tcg_out_brcond(TCGContext *s, TCGCond cond, TCGReg arg1,
TCGReg arg2, TCGLabel *l)
{
LoongArchInsn op = tcg_brcond_to_loongarch[cond].op;
tcg_debug_assert(op != 0);
if (tcg_brcond_to_loongarch[cond].swap) {
TCGReg t = arg1;
arg1 = arg2;
arg2 = t;
}
/* all conditional branch insns belong to DJSk16-format */
tcg_out_reloc(s, s->code_ptr, R_LOONGARCH_BR_SK16, l, 0);
tcg_out32(s, encode_djsk16_insn(op, arg1, arg2, 0));
}
static void tcg_out_call_int(TCGContext *s, const tcg_insn_unit *arg, bool tail)
{
TCGReg link = tail ? TCG_REG_ZERO : TCG_REG_RA;
ptrdiff_t offset = tcg_pcrel_diff(s, arg);
tcg_debug_assert((offset & 3) == 0);
if (offset == sextreg(offset, 0, 28)) {
/* short jump: +/- 256MiB */
if (tail) {
tcg_out_opc_b(s, offset >> 2);
} else {
tcg_out_opc_bl(s, offset >> 2);
}
} else if (offset == sextreg(offset, 0, 38)) {
/* long jump: +/- 256GiB */
tcg_target_long lo = sextreg(offset, 0, 18);
tcg_target_long hi = offset - lo;
tcg_out_opc_pcaddu18i(s, TCG_REG_TMP0, hi >> 18);
tcg_out_opc_jirl(s, link, TCG_REG_TMP0, lo >> 2);
} else {
/* far jump: 64-bit */
tcg_target_long lo = sextreg((tcg_target_long)arg, 0, 18);
tcg_target_long hi = (tcg_target_long)arg - lo;
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP0, hi);
tcg_out_opc_jirl(s, link, TCG_REG_TMP0, lo >> 2);
}
}
static void tcg_out_call(TCGContext *s, const tcg_insn_unit *arg,
const TCGHelperInfo *info)
{
tcg_out_call_int(s, arg, false);
}
/*
* Load/store helpers
*/
static void tcg_out_ldst(TCGContext *s, LoongArchInsn opc, TCGReg data,
TCGReg addr, intptr_t offset)
{
intptr_t imm12 = sextreg(offset, 0, 12);
if (offset != imm12) {
intptr_t diff = tcg_pcrel_diff(s, (void *)offset);
if (addr == TCG_REG_ZERO && diff == (int32_t)diff) {
imm12 = sextreg(diff, 0, 12);
tcg_out_opc_pcaddu12i(s, TCG_REG_TMP2, (diff - imm12) >> 12);
} else {
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP2, offset - imm12);
if (addr != TCG_REG_ZERO) {
tcg_out_opc_add_d(s, TCG_REG_TMP2, TCG_REG_TMP2, addr);
}
}
addr = TCG_REG_TMP2;
}
switch (opc) {
case OPC_LD_B:
case OPC_LD_BU:
case OPC_LD_H:
case OPC_LD_HU:
case OPC_LD_W:
case OPC_LD_WU:
case OPC_LD_D:
case OPC_ST_B:
case OPC_ST_H:
case OPC_ST_W:
case OPC_ST_D:
tcg_out32(s, encode_djsk12_insn(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 is_32bit = type == TCG_TYPE_I32;
tcg_out_ldst(s, is_32bit ? OPC_LD_W : OPC_LD_D, arg, arg1, arg2);
}
static void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg,
TCGReg arg1, intptr_t arg2)
{
bool is_32bit = type == TCG_TYPE_I32;
tcg_out_ldst(s, is_32bit ? OPC_ST_W : OPC_ST_D, 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;
}
/*
* Load/store helpers for SoftMMU, and qemu_ld/st implementations
*/
#if defined(CONFIG_SOFTMMU)
/*
* helper signature: helper_ret_ld_mmu(CPUState *env, target_ulong addr,
* MemOpIdx oi, uintptr_t ra)
*/
static void * const qemu_ld_helpers[4] = {
[MO_8] = helper_ret_ldub_mmu,
[MO_16] = helper_le_lduw_mmu,
[MO_32] = helper_le_ldul_mmu,
[MO_64] = helper_le_ldq_mmu,
};
/*
* helper signature: helper_ret_st_mmu(CPUState *env, target_ulong addr,
* uintxx_t val, MemOpIdx oi,
* uintptr_t ra)
*/
static void * const qemu_st_helpers[4] = {
[MO_8] = helper_ret_stb_mmu,
[MO_16] = helper_le_stw_mmu,
[MO_32] = helper_le_stl_mmu,
[MO_64] = helper_le_stq_mmu,
};
/* 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 bool tcg_out_goto(TCGContext *s, const tcg_insn_unit *target)
{
tcg_out_opc_b(s, 0);
return reloc_br_sd10k16(s->code_ptr - 1, target);
}
/*
* Emits common code for TLB addend lookup, that eventually loads the
* addend in TCG_REG_TMP2.
*/
static void tcg_out_tlb_load(TCGContext *s, TCGReg addrl, MemOpIdx 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);
tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_TMP0, TCG_AREG0, mask_ofs);
tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_TMP1, TCG_AREG0, table_ofs);
tcg_out_opc_srli_d(s, TCG_REG_TMP2, addrl,
TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS);
tcg_out_opc_and(s, TCG_REG_TMP2, TCG_REG_TMP2, TCG_REG_TMP0);
tcg_out_opc_add_d(s, 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);
tcg_out_movi(s, TCG_TYPE_TL, TCG_REG_TMP1, compare_mask);
tcg_out_opc_and(s, TCG_REG_TMP1, TCG_REG_TMP1, addrl);
/* Compare masked address with the TLB entry. */
label_ptr[0] = s->code_ptr;
tcg_out_opc_bne(s, TCG_REG_TMP0, TCG_REG_TMP1, 0);
/* TLB Hit - addend in TCG_REG_TMP2, ready for use. */
}
static void add_qemu_ldst_label(TCGContext *s, int is_ld, MemOpIdx oi,
TCGType type,
TCGReg datalo, TCGReg addrlo,
void *raddr, tcg_insn_unit **label_ptr)
{
TCGLabelQemuLdst *label = new_ldst_label(s);
label->is_ld = is_ld;
label->oi = oi;
label->type = type;
label->datalo_reg = datalo;
label->datahi_reg = 0; /* unused */
label->addrlo_reg = addrlo;
label->addrhi_reg = 0; /* unused */
label->raddr = tcg_splitwx_to_rx(raddr);
label->label_ptr[0] = label_ptr[0];
}
static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
MemOpIdx oi = l->oi;
MemOp opc = get_memop(oi);
MemOp size = opc & MO_SIZE;
TCGType type = l->type;
/* resolve label address */
if (!reloc_br_sk16(l->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
return false;
}
/* call load helper */
tcg_out_mov(s, TCG_TYPE_PTR, TCG_REG_A0, TCG_AREG0);
tcg_out_mov(s, TCG_TYPE_PTR, TCG_REG_A1, l->addrlo_reg);
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_A2, oi);
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_A3, (tcg_target_long)l->raddr);
tcg_out_call_int(s, qemu_ld_helpers[size], false);
switch (opc & MO_SSIZE) {
case MO_SB:
tcg_out_ext8s(s, l->datalo_reg, TCG_REG_A0);
break;
case MO_SW:
tcg_out_ext16s(s, l->datalo_reg, TCG_REG_A0);
break;
case MO_SL:
tcg_out_ext32s(s, l->datalo_reg, TCG_REG_A0);
break;
case MO_UL:
if (type == TCG_TYPE_I32) {
/* MO_UL loads of i32 should be sign-extended too */
tcg_out_ext32s(s, l->datalo_reg, TCG_REG_A0);
break;
}
/* fallthrough */
default:
tcg_out_mov(s, type, l->datalo_reg, TCG_REG_A0);
break;
}
return tcg_out_goto(s, l->raddr);
}
static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
MemOpIdx oi = l->oi;
MemOp opc = get_memop(oi);
MemOp size = opc & MO_SIZE;
/* resolve label address */
if (!reloc_br_sk16(l->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
return false;
}
/* call store helper */
tcg_out_mov(s, TCG_TYPE_PTR, TCG_REG_A0, TCG_AREG0);
tcg_out_mov(s, TCG_TYPE_PTR, TCG_REG_A1, l->addrlo_reg);
switch (size) {
case MO_8:
tcg_out_ext8u(s, TCG_REG_A2, l->datalo_reg);
break;
case MO_16:
tcg_out_ext16u(s, TCG_REG_A2, l->datalo_reg);
break;
case MO_32:
tcg_out_ext32u(s, TCG_REG_A2, l->datalo_reg);
break;
case MO_64:
tcg_out_mov(s, TCG_TYPE_I64, TCG_REG_A2, l->datalo_reg);
break;
default:
g_assert_not_reached();
break;
}
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_A3, oi);
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_A4, (tcg_target_long)l->raddr);
tcg_out_call_int(s, qemu_st_helpers[size], false);
return tcg_out_goto(s, l->raddr);
}
#else
/*
* Alignment helpers for user-mode emulation
*/
static void tcg_out_test_alignment(TCGContext *s, bool is_ld, TCGReg addr_reg,
unsigned a_bits)
{
TCGLabelQemuLdst *l = new_ldst_label(s);
l->is_ld = is_ld;
l->addrlo_reg = addr_reg;
/*
* Without micro-architecture details, we don't know which of bstrpick or
* andi is faster, so use bstrpick as it's not constrained by imm field
* width. (Not to say alignments >= 2^12 are going to happen any time
* soon, though)
*/
tcg_out_opc_bstrpick_d(s, TCG_REG_TMP1, addr_reg, 0, a_bits - 1);
l->label_ptr[0] = s->code_ptr;
tcg_out_opc_bne(s, TCG_REG_TMP1, TCG_REG_ZERO, 0);
l->raddr = tcg_splitwx_to_rx(s->code_ptr);
}
static bool tcg_out_fail_alignment(TCGContext *s, TCGLabelQemuLdst *l)
{
/* resolve label address */
if (!reloc_br_sk16(l->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
return false;
}
tcg_out_mov(s, TCG_TYPE_TL, TCG_REG_A1, l->addrlo_reg);
tcg_out_mov(s, TCG_TYPE_PTR, TCG_REG_A0, TCG_AREG0);
/* tail call, with the return address back inline. */
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_RA, (uintptr_t)l->raddr);
tcg_out_call_int(s, (const void *)(l->is_ld ? helper_unaligned_ld
: helper_unaligned_st), true);
return true;
}
static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
return tcg_out_fail_alignment(s, l);
}
static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
{
return tcg_out_fail_alignment(s, l);
}
#endif /* CONFIG_SOFTMMU */
/*
* `ext32u` the address register into the temp register given,
* if target is 32-bit, no-op otherwise.
*
* Returns the address register ready for use with TLB addend.
*/
static TCGReg tcg_out_zext_addr_if_32_bit(TCGContext *s,
TCGReg addr, TCGReg tmp)
{
if (TARGET_LONG_BITS == 32) {
tcg_out_ext32u(s, tmp, addr);
return tmp;
}
return addr;
}
static void tcg_out_qemu_ld_indexed(TCGContext *s, TCGReg rd, TCGReg rj,
TCGReg rk, MemOp opc, TCGType type)
{
/* Byte swapping is left to middle-end expansion. */
tcg_debug_assert((opc & MO_BSWAP) == 0);
switch (opc & MO_SSIZE) {
case MO_UB:
tcg_out_opc_ldx_bu(s, rd, rj, rk);
break;
case MO_SB:
tcg_out_opc_ldx_b(s, rd, rj, rk);
break;
case MO_UW:
tcg_out_opc_ldx_hu(s, rd, rj, rk);
break;
case MO_SW:
tcg_out_opc_ldx_h(s, rd, rj, rk);
break;
case MO_UL:
if (type == TCG_TYPE_I64) {
tcg_out_opc_ldx_wu(s, rd, rj, rk);
break;
}
/* fallthrough */
case MO_SL:
tcg_out_opc_ldx_w(s, rd, rj, rk);
break;
case MO_UQ:
tcg_out_opc_ldx_d(s, rd, rj, rk);
break;
default:
g_assert_not_reached();
}
}
static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, TCGType type)
{
TCGReg addr_regl;
TCGReg data_regl;
MemOpIdx oi;
MemOp opc;
#if defined(CONFIG_SOFTMMU)
tcg_insn_unit *label_ptr[1];
#else
unsigned a_bits;
#endif
TCGReg base;
data_regl = *args++;
addr_regl = *args++;
oi = *args++;
opc = get_memop(oi);
#if defined(CONFIG_SOFTMMU)
tcg_out_tlb_load(s, addr_regl, oi, label_ptr, 1);
base = tcg_out_zext_addr_if_32_bit(s, addr_regl, TCG_REG_TMP0);
tcg_out_qemu_ld_indexed(s, data_regl, base, TCG_REG_TMP2, opc, type);
add_qemu_ldst_label(s, 1, oi, type,
data_regl, addr_regl,
s->code_ptr, label_ptr);
#else
a_bits = get_alignment_bits(opc);
if (a_bits) {
tcg_out_test_alignment(s, true, addr_regl, a_bits);
}
base = tcg_out_zext_addr_if_32_bit(s, addr_regl, TCG_REG_TMP0);
TCGReg guest_base_reg = USE_GUEST_BASE ? TCG_GUEST_BASE_REG : TCG_REG_ZERO;
tcg_out_qemu_ld_indexed(s, data_regl, base, guest_base_reg, opc, type);
#endif
}
static void tcg_out_qemu_st_indexed(TCGContext *s, TCGReg data,
TCGReg rj, TCGReg rk, MemOp opc)
{
/* Byte swapping is left to middle-end expansion. */
tcg_debug_assert((opc & MO_BSWAP) == 0);
switch (opc & MO_SIZE) {
case MO_8:
tcg_out_opc_stx_b(s, data, rj, rk);
break;
case MO_16:
tcg_out_opc_stx_h(s, data, rj, rk);
break;
case MO_32:
tcg_out_opc_stx_w(s, data, rj, rk);
break;
case MO_64:
tcg_out_opc_stx_d(s, data, rj, rk);
break;
default:
g_assert_not_reached();
}
}
static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args)
{
TCGReg addr_regl;
TCGReg data_regl;
MemOpIdx oi;
MemOp opc;
#if defined(CONFIG_SOFTMMU)
tcg_insn_unit *label_ptr[1];
#else
unsigned a_bits;
#endif
TCGReg base;
data_regl = *args++;
addr_regl = *args++;
oi = *args++;
opc = get_memop(oi);
#if defined(CONFIG_SOFTMMU)
tcg_out_tlb_load(s, addr_regl, oi, label_ptr, 0);
base = tcg_out_zext_addr_if_32_bit(s, addr_regl, TCG_REG_TMP0);
tcg_out_qemu_st_indexed(s, data_regl, base, TCG_REG_TMP2, opc);
add_qemu_ldst_label(s, 0, oi,
0, /* type param is unused for stores */
data_regl, addr_regl,
s->code_ptr, label_ptr);
#else
a_bits = get_alignment_bits(opc);
if (a_bits) {
tcg_out_test_alignment(s, false, addr_regl, a_bits);
}
base = tcg_out_zext_addr_if_32_bit(s, addr_regl, TCG_REG_TMP0);
TCGReg guest_base_reg = USE_GUEST_BASE ? TCG_GUEST_BASE_REG : TCG_REG_ZERO;
tcg_out_qemu_st_indexed(s, data_regl, base, guest_base_reg, opc);
#endif
}
/*
* Entry-points
*/
static const tcg_insn_unit *tb_ret_addr;
static void tcg_out_exit_tb(TCGContext *s, uintptr_t a0)
{
/* Reuse the zeroing that exists for goto_ptr. */
if (a0 == 0) {
tcg_out_call_int(s, tcg_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);
}
}
static void tcg_out_goto_tb(TCGContext *s, int which)
{
/*
* Direct branch, or load indirect address, to be patched
* by tb_target_set_jmp_target. Check indirect load offset
* in range early, regardless of direct branch distance,
* via assert within tcg_out_opc_pcaddu2i.
*/
uintptr_t i_addr = get_jmp_target_addr(s, which);
intptr_t i_disp = tcg_pcrel_diff(s, (void *)i_addr);
set_jmp_insn_offset(s, which);
tcg_out_opc_pcaddu2i(s, TCG_REG_TMP0, i_disp >> 2);
/* Finish the load and indirect branch. */
tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_TMP0, TCG_REG_TMP0, 0);
tcg_out_opc_jirl(s, TCG_REG_ZERO, TCG_REG_TMP0, 0);
set_jmp_reset_offset(s, which);
}
void tb_target_set_jmp_target(const TranslationBlock *tb, int n,
uintptr_t jmp_rx, uintptr_t jmp_rw)
{
uintptr_t d_addr = tb->jmp_target_addr[n];
ptrdiff_t d_disp = (ptrdiff_t)(d_addr - jmp_rx) >> 2;
tcg_insn_unit insn;
/* Either directly branch, or load slot address for indirect branch. */
if (d_disp == sextreg(d_disp, 0, 26)) {
insn = encode_sd10k16_insn(OPC_B, d_disp);
} else {
uintptr_t i_addr = (uintptr_t)&tb->jmp_target_addr[n];
intptr_t i_disp = i_addr - jmp_rx;
insn = encode_dsj20_insn(OPC_PCADDU2I, TCG_REG_TMP0, i_disp >> 2);
}
qatomic_set((tcg_insn_unit *)jmp_rw, insn);
flush_idcache_range(jmp_rx, jmp_rw, 4);
}
static void tcg_out_op(TCGContext *s, TCGOpcode opc,
const TCGArg args[TCG_MAX_OP_ARGS],
const int const_args[TCG_MAX_OP_ARGS])
{
TCGArg a0 = args[0];
TCGArg a1 = args[1];
TCGArg a2 = args[2];
int c2 = const_args[2];
switch (opc) {
case INDEX_op_mb:
tcg_out_mb(s, a0);
break;
case INDEX_op_goto_ptr:
tcg_out_opc_jirl(s, TCG_REG_ZERO, a0, 0);
break;
case INDEX_op_br:
tcg_out_reloc(s, s->code_ptr, R_LOONGARCH_BR_SD10K16, arg_label(a0),
0);
tcg_out_opc_b(s, 0);
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_ext8s_i32:
case INDEX_op_ext8s_i64:
tcg_out_ext8s(s, a0, a1);
break;
case INDEX_op_ext8u_i32:
case INDEX_op_ext8u_i64:
tcg_out_ext8u(s, a0, a1);
break;
case INDEX_op_ext16s_i32:
case INDEX_op_ext16s_i64:
tcg_out_ext16s(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_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_srai_d(s, a0, a1, 32);
break;
case INDEX_op_not_i32:
case INDEX_op_not_i64:
tcg_out_opc_nor(s, a0, a1, TCG_REG_ZERO);
break;
case INDEX_op_nor_i32:
case INDEX_op_nor_i64:
if (c2) {
tcg_out_opc_ori(s, a0, a1, a2);
tcg_out_opc_nor(s, a0, a0, TCG_REG_ZERO);
} else {
tcg_out_opc_nor(s, a0, a1, a2);
}
break;
case INDEX_op_andc_i32:
case INDEX_op_andc_i64:
if (c2) {
/* guaranteed to fit due to constraint */
tcg_out_opc_andi(s, a0, a1, ~a2);
} else {
tcg_out_opc_andn(s, a0, a1, a2);
}
break;
case INDEX_op_orc_i32:
case INDEX_op_orc_i64:
if (c2) {
/* guaranteed to fit due to constraint */
tcg_out_opc_ori(s, a0, a1, ~a2);
} else {
tcg_out_opc_orn(s, a0, a1, a2);
}
break;
case INDEX_op_and_i32:
case INDEX_op_and_i64:
if (c2) {
tcg_out_opc_andi(s, a0, a1, a2);
} else {
tcg_out_opc_and(s, a0, a1, a2);
}
break;
case INDEX_op_or_i32:
case INDEX_op_or_i64:
if (c2) {
tcg_out_opc_ori(s, a0, a1, a2);
} else {
tcg_out_opc_or(s, a0, a1, a2);
}
break;
case INDEX_op_xor_i32:
case INDEX_op_xor_i64:
if (c2) {
tcg_out_opc_xori(s, a0, a1, a2);
} else {
tcg_out_opc_xor(s, a0, a1, a2);
}
break;
case INDEX_op_extract_i32:
tcg_out_opc_bstrpick_w(s, a0, a1, a2, a2 + args[3] - 1);
break;
case INDEX_op_extract_i64:
tcg_out_opc_bstrpick_d(s, a0, a1, a2, a2 + args[3] - 1);
break;
case INDEX_op_deposit_i32:
tcg_out_opc_bstrins_w(s, a0, a2, args[3], args[3] + args[4] - 1);
break;
case INDEX_op_deposit_i64:
tcg_out_opc_bstrins_d(s, a0, a2, args[3], args[3] + args[4] - 1);
break;
case INDEX_op_bswap16_i32:
case INDEX_op_bswap16_i64:
tcg_out_opc_revb_2h(s, a0, a1);
if (a2 & TCG_BSWAP_OS) {
tcg_out_ext16s(s, a0, a0);
} else if ((a2 & (TCG_BSWAP_IZ | TCG_BSWAP_OZ)) == TCG_BSWAP_OZ) {
tcg_out_ext16u(s, a0, a0);
}
break;
case INDEX_op_bswap32_i32:
/* All 32-bit values are computed sign-extended in the register. */
a2 = TCG_BSWAP_OS;
/* fallthrough */
case INDEX_op_bswap32_i64:
tcg_out_opc_revb_2w(s, a0, a1);
if (a2 & TCG_BSWAP_OS) {
tcg_out_ext32s(s, a0, a0);
} else if ((a2 & (TCG_BSWAP_IZ | TCG_BSWAP_OZ)) == TCG_BSWAP_OZ) {
tcg_out_ext32u(s, a0, a0);
}
break;
case INDEX_op_bswap64_i64:
tcg_out_opc_revb_d(s, a0, a1);
break;
case INDEX_op_clz_i32:
tcg_out_clzctz(s, OPC_CLZ_W, a0, a1, a2, c2, true);
break;
case INDEX_op_clz_i64:
tcg_out_clzctz(s, OPC_CLZ_D, a0, a1, a2, c2, false);
break;
case INDEX_op_ctz_i32:
tcg_out_clzctz(s, OPC_CTZ_W, a0, a1, a2, c2, true);
break;
case INDEX_op_ctz_i64:
tcg_out_clzctz(s, OPC_CTZ_D, a0, a1, a2, c2, false);
break;
case INDEX_op_shl_i32:
if (c2) {
tcg_out_opc_slli_w(s, a0, a1, a2 & 0x1f);
} else {
tcg_out_opc_sll_w(s, a0, a1, a2);
}
break;
case INDEX_op_shl_i64:
if (c2) {
tcg_out_opc_slli_d(s, a0, a1, a2 & 0x3f);
} else {
tcg_out_opc_sll_d(s, a0, a1, a2);
}
break;
case INDEX_op_shr_i32:
if (c2) {
tcg_out_opc_srli_w(s, a0, a1, a2 & 0x1f);
} else {
tcg_out_opc_srl_w(s, a0, a1, a2);
}
break;
case INDEX_op_shr_i64:
if (c2) {
tcg_out_opc_srli_d(s, a0, a1, a2 & 0x3f);
} else {
tcg_out_opc_srl_d(s, a0, a1, a2);
}
break;
case INDEX_op_sar_i32:
if (c2) {
tcg_out_opc_srai_w(s, a0, a1, a2 & 0x1f);
} else {
tcg_out_opc_sra_w(s, a0, a1, a2);
}
break;
case INDEX_op_sar_i64:
if (c2) {
tcg_out_opc_srai_d(s, a0, a1, a2 & 0x3f);
} else {
tcg_out_opc_sra_d(s, a0, a1, a2);
}
break;
case INDEX_op_rotl_i32:
/* transform into equivalent rotr/rotri */
if (c2) {
tcg_out_opc_rotri_w(s, a0, a1, (32 - a2) & 0x1f);
} else {
tcg_out_opc_sub_w(s, TCG_REG_TMP0, TCG_REG_ZERO, a2);
tcg_out_opc_rotr_w(s, a0, a1, TCG_REG_TMP0);
}
break;
case INDEX_op_rotl_i64:
/* transform into equivalent rotr/rotri */
if (c2) {
tcg_out_opc_rotri_d(s, a0, a1, (64 - a2) & 0x3f);
} else {
tcg_out_opc_sub_w(s, TCG_REG_TMP0, TCG_REG_ZERO, a2);
tcg_out_opc_rotr_d(s, a0, a1, TCG_REG_TMP0);
}
break;
case INDEX_op_rotr_i32:
if (c2) {
tcg_out_opc_rotri_w(s, a0, a1, a2 & 0x1f);
} else {
tcg_out_opc_rotr_w(s, a0, a1, a2);
}
break;
case INDEX_op_rotr_i64:
if (c2) {
tcg_out_opc_rotri_d(s, a0, a1, a2 & 0x3f);
} else {
tcg_out_opc_rotr_d(s, a0, a1, a2);
}
break;
case INDEX_op_add_i32:
if (c2) {
tcg_out_addi(s, TCG_TYPE_I32, a0, a1, a2);
} else {
tcg_out_opc_add_w(s, a0, a1, a2);
}
break;
case INDEX_op_add_i64:
if (c2) {
tcg_out_addi(s, TCG_TYPE_I64, a0, a1, a2);
} else {
tcg_out_opc_add_d(s, a0, a1, a2);
}
break;
case INDEX_op_sub_i32:
if (c2) {
tcg_out_addi(s, TCG_TYPE_I32, a0, a1, -a2);
} else {
tcg_out_opc_sub_w(s, a0, a1, a2);
}
break;
case INDEX_op_sub_i64:
if (c2) {
tcg_out_addi(s, TCG_TYPE_I64, a0, a1, -a2);
} else {
tcg_out_opc_sub_d(s, a0, a1, a2);
}
break;
case INDEX_op_mul_i32:
tcg_out_opc_mul_w(s, a0, a1, a2);
break;
case INDEX_op_mul_i64:
tcg_out_opc_mul_d(s, a0, a1, a2);
break;
case INDEX_op_mulsh_i32:
tcg_out_opc_mulh_w(s, a0, a1, a2);
break;
case INDEX_op_mulsh_i64:
tcg_out_opc_mulh_d(s, a0, a1, a2);
break;
case INDEX_op_muluh_i32:
tcg_out_opc_mulh_wu(s, a0, a1, a2);
break;
case INDEX_op_muluh_i64:
tcg_out_opc_mulh_du(s, a0, a1, a2);
break;
case INDEX_op_div_i32:
tcg_out_opc_div_w(s, a0, a1, a2);
break;
case INDEX_op_div_i64:
tcg_out_opc_div_d(s, a0, a1, a2);
break;
case INDEX_op_divu_i32:
tcg_out_opc_div_wu(s, a0, a1, a2);
break;
case INDEX_op_divu_i64:
tcg_out_opc_div_du(s, a0, a1, a2);
break;
case INDEX_op_rem_i32:
tcg_out_opc_mod_w(s, a0, a1, a2);
break;
case INDEX_op_rem_i64:
tcg_out_opc_mod_d(s, a0, a1, a2);
break;
case INDEX_op_remu_i32:
tcg_out_opc_mod_wu(s, a0, a1, a2);
break;
case INDEX_op_remu_i64:
tcg_out_opc_mod_du(s, a0, a1, a2);
break;
case INDEX_op_setcond_i32:
case INDEX_op_setcond_i64:
tcg_out_setcond(s, args[3], a0, a1, a2, c2);
break;
case INDEX_op_movcond_i32:
case INDEX_op_movcond_i64:
tcg_out_movcond(s, args[5], a0, a1, a2, c2, args[3], args[4]);
break;
case INDEX_op_ld8s_i32:
case INDEX_op_ld8s_i64:
tcg_out_ldst(s, OPC_LD_B, a0, a1, a2);
break;
case INDEX_op_ld8u_i32:
case INDEX_op_ld8u_i64:
tcg_out_ldst(s, OPC_LD_BU, a0, a1, a2);
break;
case INDEX_op_ld16s_i32:
case INDEX_op_ld16s_i64:
tcg_out_ldst(s, OPC_LD_H, a0, a1, a2);
break;
case INDEX_op_ld16u_i32:
case INDEX_op_ld16u_i64:
tcg_out_ldst(s, OPC_LD_HU, a0, a1, a2);
break;
case INDEX_op_ld_i32:
case INDEX_op_ld32s_i64:
tcg_out_ldst(s, OPC_LD_W, a0, a1, a2);
break;
case INDEX_op_ld32u_i64:
tcg_out_ldst(s, OPC_LD_WU, a0, a1, a2);
break;
case INDEX_op_ld_i64:
tcg_out_ldst(s, OPC_LD_D, a0, a1, a2);
break;
case INDEX_op_st8_i32:
case INDEX_op_st8_i64:
tcg_out_ldst(s, OPC_ST_B, a0, a1, a2);
break;
case INDEX_op_st16_i32:
case INDEX_op_st16_i64:
tcg_out_ldst(s, OPC_ST_H, a0, a1, a2);
break;
case INDEX_op_st_i32:
case INDEX_op_st32_i64:
tcg_out_ldst(s, OPC_ST_W, a0, a1, a2);
break;
case INDEX_op_st_i64:
tcg_out_ldst(s, OPC_ST_D, a0, a1, a2);
break;
case INDEX_op_qemu_ld_i32:
tcg_out_qemu_ld(s, args, TCG_TYPE_I32);
break;
case INDEX_op_qemu_ld_i64:
tcg_out_qemu_ld(s, args, TCG_TYPE_I64);
break;
case INDEX_op_qemu_st_i32:
tcg_out_qemu_st(s, args);
break;
case INDEX_op_qemu_st_i64:
tcg_out_qemu_st(s, args);
break;
case INDEX_op_mov_i32: /* Always emitted via tcg_out_mov. */
case INDEX_op_mov_i64:
case INDEX_op_call: /* Always emitted via tcg_out_call. */
case INDEX_op_exit_tb: /* Always emitted via tcg_out_exit_tb. */
case INDEX_op_goto_tb: /* Always emitted via tcg_out_goto_tb. */
default:
g_assert_not_reached();
}
}
static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
{
switch (op) {
case INDEX_op_goto_ptr:
return C_O0_I1(r);
case INDEX_op_st8_i32:
case INDEX_op_st8_i64:
case INDEX_op_st16_i32:
case INDEX_op_st16_i64:
case INDEX_op_st32_i64:
case INDEX_op_st_i32:
case INDEX_op_st_i64:
return C_O0_I2(rZ, r);
case INDEX_op_brcond_i32:
case INDEX_op_brcond_i64:
return C_O0_I2(rZ, rZ);
case INDEX_op_qemu_st_i32:
case INDEX_op_qemu_st_i64:
return C_O0_I2(LZ, L);
case INDEX_op_ext8s_i32:
case INDEX_op_ext8s_i64:
case INDEX_op_ext8u_i32:
case INDEX_op_ext8u_i64:
case INDEX_op_ext16s_i32:
case INDEX_op_ext16s_i64:
case INDEX_op_ext16u_i32:
case INDEX_op_ext16u_i64:
case INDEX_op_ext32s_i64:
case INDEX_op_ext32u_i64:
case INDEX_op_extu_i32_i64:
case INDEX_op_extrl_i64_i32:
case INDEX_op_extrh_i64_i32:
case INDEX_op_ext_i32_i64:
case INDEX_op_not_i32:
case INDEX_op_not_i64:
case INDEX_op_extract_i32:
case INDEX_op_extract_i64:
case INDEX_op_bswap16_i32:
case INDEX_op_bswap16_i64:
case INDEX_op_bswap32_i32:
case INDEX_op_bswap32_i64:
case INDEX_op_bswap64_i64:
case INDEX_op_ld8s_i32:
case INDEX_op_ld8s_i64:
case INDEX_op_ld8u_i32:
case INDEX_op_ld8u_i64:
case INDEX_op_ld16s_i32:
case INDEX_op_ld16s_i64:
case INDEX_op_ld16u_i32:
case INDEX_op_ld16u_i64:
case INDEX_op_ld32s_i64:
case INDEX_op_ld32u_i64:
case INDEX_op_ld_i32:
case INDEX_op_ld_i64:
return C_O1_I1(r, r);
case INDEX_op_qemu_ld_i32:
case INDEX_op_qemu_ld_i64:
return C_O1_I1(r, L);
case INDEX_op_andc_i32:
case INDEX_op_andc_i64:
case INDEX_op_orc_i32:
case INDEX_op_orc_i64:
/*
* LoongArch insns for these ops don't have reg-imm forms, but we
* can express using andi/ori if ~constant satisfies
* TCG_CT_CONST_U12.
*/
return C_O1_I2(r, r, rC);
case INDEX_op_shl_i32:
case INDEX_op_shl_i64:
case INDEX_op_shr_i32:
case INDEX_op_shr_i64:
case INDEX_op_sar_i32:
case INDEX_op_sar_i64:
case INDEX_op_rotl_i32:
case INDEX_op_rotl_i64:
case INDEX_op_rotr_i32:
case INDEX_op_rotr_i64:
return C_O1_I2(r, r, ri);
case INDEX_op_add_i32:
return C_O1_I2(r, r, ri);
case INDEX_op_add_i64:
return C_O1_I2(r, r, rJ);
case INDEX_op_and_i32:
case INDEX_op_and_i64:
case INDEX_op_nor_i32:
case INDEX_op_nor_i64:
case INDEX_op_or_i32:
case INDEX_op_or_i64:
case INDEX_op_xor_i32:
case INDEX_op_xor_i64:
/* LoongArch reg-imm bitops have their imms ZERO-extended */
return C_O1_I2(r, r, rU);
case INDEX_op_clz_i32:
case INDEX_op_clz_i64:
case INDEX_op_ctz_i32:
case INDEX_op_ctz_i64:
return C_O1_I2(r, r, rW);
case INDEX_op_deposit_i32:
case INDEX_op_deposit_i64:
/* Must deposit into the same register as input */
return C_O1_I2(r, 0, rZ);
case INDEX_op_sub_i32:
case INDEX_op_setcond_i32:
return C_O1_I2(r, rZ, ri);
case INDEX_op_sub_i64:
case INDEX_op_setcond_i64:
return C_O1_I2(r, rZ, rJ);
case INDEX_op_mul_i32:
case INDEX_op_mul_i64:
case INDEX_op_mulsh_i32:
case INDEX_op_mulsh_i64:
case INDEX_op_muluh_i32:
case INDEX_op_muluh_i64:
case INDEX_op_div_i32:
case INDEX_op_div_i64:
case INDEX_op_divu_i32:
case INDEX_op_divu_i64:
case INDEX_op_rem_i32:
case INDEX_op_rem_i64:
case INDEX_op_remu_i32:
case INDEX_op_remu_i64:
return C_O1_I2(r, rZ, rZ);
case INDEX_op_movcond_i32:
case INDEX_op_movcond_i64:
return C_O1_I4(r, rZ, rJ, rZ, rZ);
default:
g_assert_not_reached();
}
}
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_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_addi_d(s, 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)
if (USE_GUEST_BASE) {
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_jirl(s, TCG_REG_ZERO, tcg_target_call_iarg_regs[1], 0);
/* Return path for goto_ptr. Set return value to 0 */
tcg_code_gen_epilogue = tcg_splitwx_to_rx(s->code_ptr);
tcg_out_mov(s, TCG_TYPE_REG, TCG_REG_A0, TCG_REG_ZERO);
/* TB epilogue */
tb_ret_addr = tcg_splitwx_to_rx(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_addi_d(s, TCG_REG_SP, TCG_REG_SP, FRAME_SIZE);
tcg_out_opc_jirl(s, TCG_REG_ZERO, TCG_REG_RA, 0);
}
static void tcg_target_init(TCGContext *s)
{
tcg_target_available_regs[TCG_TYPE_I32] = ALL_GENERAL_REGS;
tcg_target_available_regs[TCG_TYPE_I64] = ALL_GENERAL_REGS;
tcg_target_call_clobber_regs = ALL_GENERAL_REGS;
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);
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_TP);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_RESERVED);
}
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_LOONGARCH
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 + 23, 11, /* DW_CFA_offset, s0, -88 */
0x80 + 24, 10, /* DW_CFA_offset, s1, -80 */
0x80 + 25, 9, /* DW_CFA_offset, s2, -72 */
0x80 + 26, 8, /* DW_CFA_offset, s3, -64 */
0x80 + 27, 7, /* DW_CFA_offset, s4, -56 */
0x80 + 28, 6, /* DW_CFA_offset, s5, -48 */
0x80 + 29, 5, /* DW_CFA_offset, s6, -40 */
0x80 + 30, 4, /* DW_CFA_offset, s7, -32 */
0x80 + 31, 3, /* DW_CFA_offset, s8, -24 */
0x80 + 22, 2, /* DW_CFA_offset, s9, -16 */
0x80 + 1 , 1, /* DW_CFA_offset, ra, -8 */
}
};
void tcg_register_jit(const void *buf, size_t buf_size)
{
tcg_register_jit_int(buf, buf_size, &debug_frame, sizeof(debug_frame));
}
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