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[Qemu-devel] [RFC v1 17/23] riscv: tcg-target: Add direct load and store
From: |
Alistair Francis |
Subject: |
[Qemu-devel] [RFC v1 17/23] riscv: tcg-target: Add direct load and store instructions |
Date: |
Thu, 15 Nov 2018 22:36:28 +0000 |
Signed-off-by: Alistair Francis <address@hidden>
Signed-off-by: Michael Clark <address@hidden>
---
tcg/riscv/tcg-target.inc.c | 145 +++++++++++++++++++++++++++++++++++++
1 file changed, 145 insertions(+)
diff --git a/tcg/riscv/tcg-target.inc.c b/tcg/riscv/tcg-target.inc.c
index 5fe6935e24..c4a013a962 100644
--- a/tcg/riscv/tcg-target.inc.c
+++ b/tcg/riscv/tcg-target.inc.c
@@ -958,6 +958,151 @@ static void tcg_out_qemu_st_slow_path(TCGContext *s,
TCGLabelQemuLdst *l)
}
#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;
+
+ /* TODO: Handle byte swapping */
+
+ 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 {
+ tcg_out_opc_imm(s, OPC_LW, lo, base, 0);
+ tcg_out_opc_imm(s, OPC_LW, hi, base, 4);
+ }
+ 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;
+ }
+ 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;
+
+ /* TODO: Handle byte swapping */
+
+ 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];
+ TCGReg base = TCG_REG_L0;
+#else
+ TCGReg base = TCG_REG_TMP0;
+#endif
+
+ 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;
+ }
+ 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
+}
+
void tb_target_set_jmp_target(uintptr_t tc_ptr, uintptr_t jmp_addr,
uintptr_t addr)
{
--
2.19.1
[Qemu-devel] [RFC v1 17/23] riscv: tcg-target: Add direct load and store instructions,
Alistair Francis <=
[Qemu-devel] [RFC v1 18/23] riscv: tcg-target: Add the out op decoder, Alistair Francis, 2018/11/15
[Qemu-devel] [RFC v1 19/23] riscv: tcg-target: Add the prologue generation, Alistair Francis, 2018/11/15
[Qemu-devel] [RFC v1 20/23] riscv: tcg-target: Add the target init code, Alistair Francis, 2018/11/15