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tcg/riscv: Add direct load and store instructions
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Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Michael Clark <mjc@sifive.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <2e047a95c39c007c66cda024c095e29b0ac4c43e.1545246859.git.alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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@alistair23 @rth7680
alistair23 authored and rth7680 committed Dec 25, 2018
1 parent efbea94 commit 03a7d02
Showing 1 changed file with 158 additions and 0 deletions.
158 changes: 158 additions & 0 deletions tcg/riscv/tcg-target.inc.c
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Expand Up @@ -1151,3 +1151,161 @@ static void tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
tcg_out_goto(s, l->raddr);
}
#endif /* CONFIG_SOFTMMU */

static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg lo, TCGReg hi,
TCGReg base, TCGMemOp opc, bool is_64)
{
const TCGMemOp 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;
TCGMemOp 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, TCGMemOp opc)
{
const TCGMemOp 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;
TCGMemOp 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
}

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