Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 175 insertions, 0 deletions

diff --git a/tcg/riscv/tcg-target.h b/tcg/riscv/tcg-target.h
new file mode 100644
index 000000000..ef78b99e9
--- /dev/null
+++ b/tcg/riscv/tcg-target.h
@@ -0,0 +1,175 @@
+/*
+ * Tiny Code Generator for QEMU
+ *
+ * Copyright (c) 2018 SiFive, Inc
+ *
+ * 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.
+ */
+
+#ifndef RISCV_TCG_TARGET_H
+#define RISCV_TCG_TARGET_H
+
+#if __riscv_xlen == 32
+# define TCG_TARGET_REG_BITS 32
+#elif __riscv_xlen == 64
+# define TCG_TARGET_REG_BITS 64
+#endif
+
+#define TCG_TARGET_INSN_UNIT_SIZE 4
+#define TCG_TARGET_TLB_DISPLACEMENT_BITS 20
+#define TCG_TARGET_NB_REGS 32
+#define MAX_CODE_GEN_BUFFER_SIZE  ((size_t)-1)
+
+typedef enum {
+    TCG_REG_ZERO,
+    TCG_REG_RA,
+    TCG_REG_SP,
+    TCG_REG_GP,
+    TCG_REG_TP,
+    TCG_REG_T0,
+    TCG_REG_T1,
+    TCG_REG_T2,
+    TCG_REG_S0,
+    TCG_REG_S1,
+    TCG_REG_A0,
+    TCG_REG_A1,
+    TCG_REG_A2,
+    TCG_REG_A3,
+    TCG_REG_A4,
+    TCG_REG_A5,
+    TCG_REG_A6,
+    TCG_REG_A7,
+    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_T3,
+    TCG_REG_T4,
+    TCG_REG_T5,
+    TCG_REG_T6,
+
+    /* aliases */
+    TCG_AREG0          = TCG_REG_S0,
+    TCG_GUEST_BASE_REG = TCG_REG_S1,
+    TCG_REG_TMP0       = TCG_REG_T6,
+    TCG_REG_TMP1       = TCG_REG_T5,
+    TCG_REG_TMP2       = TCG_REG_T4,
+} TCGReg;
+
+/* used for function call generation */
+#define TCG_REG_CALL_STACK              TCG_REG_SP
+#define TCG_TARGET_STACK_ALIGN          16
+#define TCG_TARGET_CALL_ALIGN_ARGS      1
+#define TCG_TARGET_CALL_STACK_OFFSET    0
+
+/* optional instructions */
+#define TCG_TARGET_HAS_movcond_i32      0
+#define TCG_TARGET_HAS_div_i32          1
+#define TCG_TARGET_HAS_rem_i32          1
+#define TCG_TARGET_HAS_div2_i32         0
+#define TCG_TARGET_HAS_rot_i32          0
+#define TCG_TARGET_HAS_deposit_i32      0
+#define TCG_TARGET_HAS_extract_i32      0
+#define TCG_TARGET_HAS_sextract_i32     0
+#define TCG_TARGET_HAS_extract2_i32     0
+#define TCG_TARGET_HAS_add2_i32         1
+#define TCG_TARGET_HAS_sub2_i32         1
+#define TCG_TARGET_HAS_mulu2_i32        0
+#define TCG_TARGET_HAS_muls2_i32        0
+#define TCG_TARGET_HAS_muluh_i32        (TCG_TARGET_REG_BITS == 32)
+#define TCG_TARGET_HAS_mulsh_i32        (TCG_TARGET_REG_BITS == 32)
+#define TCG_TARGET_HAS_ext8s_i32        1
+#define TCG_TARGET_HAS_ext16s_i32       1
+#define TCG_TARGET_HAS_ext8u_i32        1
+#define TCG_TARGET_HAS_ext16u_i32       1
+#define TCG_TARGET_HAS_bswap16_i32      0
+#define TCG_TARGET_HAS_bswap32_i32      0
+#define TCG_TARGET_HAS_not_i32          1
+#define TCG_TARGET_HAS_neg_i32          1
+#define TCG_TARGET_HAS_andc_i32         0
+#define TCG_TARGET_HAS_orc_i32          0
+#define TCG_TARGET_HAS_eqv_i32          0
+#define TCG_TARGET_HAS_nand_i32         0
+#define TCG_TARGET_HAS_nor_i32          0
+#define TCG_TARGET_HAS_clz_i32          0
+#define TCG_TARGET_HAS_ctz_i32          0
+#define TCG_TARGET_HAS_ctpop_i32        0
+#define TCG_TARGET_HAS_direct_jump      0
+#define TCG_TARGET_HAS_brcond2          1
+#define TCG_TARGET_HAS_setcond2         1
+#define TCG_TARGET_HAS_qemu_st8_i32     0
+
+#if TCG_TARGET_REG_BITS == 64
+#define TCG_TARGET_HAS_movcond_i64      0
+#define TCG_TARGET_HAS_div_i64          1
+#define TCG_TARGET_HAS_rem_i64          1
+#define TCG_TARGET_HAS_div2_i64         0
+#define TCG_TARGET_HAS_rot_i64          0
+#define TCG_TARGET_HAS_deposit_i64      0
+#define TCG_TARGET_HAS_extract_i64      0
+#define TCG_TARGET_HAS_sextract_i64     0
+#define TCG_TARGET_HAS_extract2_i64     0
+#define TCG_TARGET_HAS_extrl_i64_i32    1
+#define TCG_TARGET_HAS_extrh_i64_i32    1
+#define TCG_TARGET_HAS_ext8s_i64        1
+#define TCG_TARGET_HAS_ext16s_i64       1
+#define TCG_TARGET_HAS_ext32s_i64       1
+#define TCG_TARGET_HAS_ext8u_i64        1
+#define TCG_TARGET_HAS_ext16u_i64       1
+#define TCG_TARGET_HAS_ext32u_i64       1
+#define TCG_TARGET_HAS_bswap16_i64      0
+#define TCG_TARGET_HAS_bswap32_i64      0
+#define TCG_TARGET_HAS_bswap64_i64      0
+#define TCG_TARGET_HAS_not_i64          1
+#define TCG_TARGET_HAS_neg_i64          1
+#define TCG_TARGET_HAS_andc_i64         0
+#define TCG_TARGET_HAS_orc_i64          0
+#define TCG_TARGET_HAS_eqv_i64          0
+#define TCG_TARGET_HAS_nand_i64         0
+#define TCG_TARGET_HAS_nor_i64          0
+#define TCG_TARGET_HAS_clz_i64          0
+#define TCG_TARGET_HAS_ctz_i64          0
+#define TCG_TARGET_HAS_ctpop_i64        0
+#define TCG_TARGET_HAS_add2_i64         1
+#define TCG_TARGET_HAS_sub2_i64         1
+#define TCG_TARGET_HAS_mulu2_i64        0
+#define TCG_TARGET_HAS_muls2_i64        0
+#define TCG_TARGET_HAS_muluh_i64        1
+#define TCG_TARGET_HAS_mulsh_i64        1
+#endif
+
+/* not defined -- call should be eliminated at compile time */
+void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t, uintptr_t);
+
+#define TCG_TARGET_DEFAULT_MO (0)
+
+#ifdef CONFIG_SOFTMMU
+#define TCG_TARGET_NEED_LDST_LABELS
+#endif
+#define TCG_TARGET_NEED_POOL_LABELS
+
+#define TCG_TARGET_HAS_MEMORY_BSWAP 0
+
+#endif