target/riscv: add vector configure instruction

vsetvl and vsetvli are two configure instructions for vl, vtype. TB flags
should update after configure instructions. The (ill, lmul, sew ) of vtype
and the bit of (VSTART == 0 && VL == VLMAX) will be placed within tb_flags.

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200701152549.1218-5-zhiwei_liu@c-sky.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

1 files changed, 54 insertions, 9 deletions

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 302e085..0ad51c6 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -21,6 +21,7 @@
 #define RISCV_CPU_H
 
 #include "hw/core/cpu.h"
+#include "hw/registerfields.h"
 #include "exec/cpu-defs.h"
 #include "fpu/softfloat-types.h"
 
@@ -93,6 +94,12 @@ typedef struct CPURISCVState CPURISCVState;
 
 #define RV_VLEN_MAX 512
 
+FIELD(VTYPE, VLMUL, 0, 2)
+FIELD(VTYPE, VSEW, 2, 3)
+FIELD(VTYPE, VEDIV, 5, 2)
+FIELD(VTYPE, RESERVED, 7, sizeof(target_ulong) * 8 - 9)
+FIELD(VTYPE, VILL, sizeof(target_ulong) * 8 - 2, 1)
+
 struct CPURISCVState {
     target_ulong gpr[32];
     uint64_t fpr[32]; /* assume both F and D extensions */
@@ -352,19 +359,62 @@ void riscv_cpu_set_fflags(CPURISCVState *env, target_ulong);
 #define TB_FLAGS_MMU_MASK   3
 #define TB_FLAGS_MSTATUS_FS MSTATUS_FS
 
+typedef CPURISCVState CPUArchState;
+typedef RISCVCPU ArchCPU;
+#include "exec/cpu-all.h"
+
+FIELD(TB_FLAGS, VL_EQ_VLMAX, 2, 1)
+FIELD(TB_FLAGS, LMUL, 3, 2)
+FIELD(TB_FLAGS, SEW, 5, 3)
+FIELD(TB_FLAGS, VILL, 8, 1)
+
+/*
+ * A simplification for VLMAX
+ * = (1 << LMUL) * VLEN / (8 * (1 << SEW))
+ * = (VLEN << LMUL) / (8 << SEW)
+ * = (VLEN << LMUL) >> (SEW + 3)
+ * = VLEN >> (SEW + 3 - LMUL)
+ */
+static inline uint32_t vext_get_vlmax(RISCVCPU *cpu, target_ulong vtype)
+{
+    uint8_t sew, lmul;
+
+    sew = FIELD_EX64(vtype, VTYPE, VSEW);
+    lmul = FIELD_EX64(vtype, VTYPE, VLMUL);
+    return cpu->cfg.vlen >> (sew + 3 - lmul);
+}
+
 static inline void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
-                                        target_ulong *cs_base, uint32_t *flags)
+                                        target_ulong *cs_base, uint32_t *pflags)
 {
+    uint32_t flags = 0;
+
     *pc = env->pc;
     *cs_base = 0;
+
+    if (riscv_has_ext(env, RVV)) {
+        uint32_t vlmax = vext_get_vlmax(env_archcpu(env), env->vtype);
+        bool vl_eq_vlmax = (env->vstart == 0) && (vlmax == env->vl);
+        flags = FIELD_DP32(flags, TB_FLAGS, VILL,
+                    FIELD_EX64(env->vtype, VTYPE, VILL));
+        flags = FIELD_DP32(flags, TB_FLAGS, SEW,
+                    FIELD_EX64(env->vtype, VTYPE, VSEW));
+        flags = FIELD_DP32(flags, TB_FLAGS, LMUL,
+                    FIELD_EX64(env->vtype, VTYPE, VLMUL));
+        flags = FIELD_DP32(flags, TB_FLAGS, VL_EQ_VLMAX, vl_eq_vlmax);
+    } else {
+        flags = FIELD_DP32(flags, TB_FLAGS, VILL, 1);
+    }
+
 #ifdef CONFIG_USER_ONLY
-    *flags = TB_FLAGS_MSTATUS_FS;
+    flags |= TB_FLAGS_MSTATUS_FS;
 #else
-    *flags = cpu_mmu_index(env, 0);
+    flags |= cpu_mmu_index(env, 0);
     if (riscv_cpu_fp_enabled(env)) {
-        *flags |= env->mstatus & MSTATUS_FS;
+        flags |= env->mstatus & MSTATUS_FS;
     }
 #endif
+    *pflags = flags;
 }
 
 int riscv_csrrw(CPURISCVState *env, int csrno, target_ulong *ret_value,
@@ -405,9 +455,4 @@ void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops);
 
 void riscv_cpu_register_gdb_regs_for_features(CPUState *cs);
 
-typedef CPURISCVState CPUArchState;
-typedef RISCVCPU ArchCPU;
-
-#include "exec/cpu-all.h"
-
 #endif /* RISCV_CPU_H */