[RFC PATCH v3 28/34] Hexagon (target/hexagon) TCG generation helpers

[Taylor Simpson <tsimpson@quicinc.com>]

Helpers for reading and writing registers
Helpers for load-locked/store-conditional

Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
---
 target/hexagon/genptr_helpers.h | 244 ++++++++++++++++++++++++++++++++++++++++
 target/hexagon/op_helper.c      |  18 +++
 2 files changed, 262 insertions(+)
 create mode 100644 target/hexagon/genptr_helpers.h

diff --git a/target/hexagon/genptr_helpers.h b/target/hexagon/genptr_helpers.h
new file mode 100644
index 0000000..ffcb1e3
--- /dev/null
+++ b/target/hexagon/genptr_helpers.h
@@ -0,0 +1,244 @@
+/*
+ *  Copyright(c) 2019-2020 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef HEXAGON_GENPTR_HELPERS_H
+#define HEXAGON_GENPTR_HELPERS_H
+
+#include "tcg/tcg.h"
+
+static inline TCGv gen_read_reg(TCGv result, int num)
+{
+    tcg_gen_mov_tl(result, hex_gpr[num]);
+    return result;
+}
+
+static inline TCGv gen_read_preg(TCGv pred, uint8_t num)
+{
+    tcg_gen_mov_tl(pred, hex_pred[num]);
+    return pred;
+}
+
+static inline void gen_log_reg_write(int rnum, TCGv val, int slot,
+                                     int is_predicated)
+{
+    if (is_predicated) {
+        TCGv one = tcg_const_tl(1);
+        TCGv zero = tcg_const_tl(0);
+        TCGv slot_mask = tcg_temp_new();
+
+        tcg_gen_andi_tl(slot_mask, hex_slot_cancelled, 1 << slot);
+        tcg_gen_movcond_tl(TCG_COND_EQ, hex_new_value[rnum], slot_mask, zero,
+                           val, hex_new_value[rnum]);
+#if HEX_DEBUG
+        /* Do this so HELPER(debug_commit_end) will know */
+        tcg_gen_movcond_tl(TCG_COND_EQ, hex_reg_written[rnum], slot_mask, zero,
+                           one, hex_reg_written[rnum]);
+#endif
+
+        tcg_temp_free(one);
+        tcg_temp_free(zero);
+        tcg_temp_free(slot_mask);
+    } else {
+        tcg_gen_mov_tl(hex_new_value[rnum], val);
+#if HEX_DEBUG
+        /* Do this so HELPER(debug_commit_end) will know */
+        tcg_gen_movi_tl(hex_reg_written[rnum], 1);
+#endif
+    }
+}
+
+static inline void gen_log_reg_write_pair(int rnum, TCGv_i64 val, int slot,
+                                          int is_predicated)
+{
+    TCGv val32 = tcg_temp_new();
+
+    if (is_predicated) {
+        TCGv one = tcg_const_tl(1);
+        TCGv zero = tcg_const_tl(0);
+        TCGv slot_mask = tcg_temp_new();
+
+        tcg_gen_andi_tl(slot_mask, hex_slot_cancelled, 1 << slot);
+        /* Low word */
+        tcg_gen_extrl_i64_i32(val32, val);
+        tcg_gen_movcond_tl(TCG_COND_EQ, hex_new_value[rnum], slot_mask, zero,
+                           val32, hex_new_value[rnum]);
+#if HEX_DEBUG
+        /* Do this so HELPER(debug_commit_end) will know */
+        tcg_gen_movcond_tl(TCG_COND_EQ, hex_reg_written[rnum],
+                           slot_mask, zero,
+                           one, hex_reg_written[rnum]);
+#endif
+
+        /* High word */
+        tcg_gen_extrh_i64_i32(val32, val);
+        tcg_gen_movcond_tl(TCG_COND_EQ, hex_new_value[rnum + 1],
+                           slot_mask, zero,
+                           val32, hex_new_value[rnum + 1]);
+#if HEX_DEBUG
+        /* Do this so HELPER(debug_commit_end) will know */
+        tcg_gen_movcond_tl(TCG_COND_EQ, hex_reg_written[rnum + 1],
+                           slot_mask, zero,
+                           one, hex_reg_written[rnum + 1]);
+#endif
+
+        tcg_temp_free(one);
+        tcg_temp_free(zero);
+        tcg_temp_free(slot_mask);
+    } else {
+        /* Low word */
+        tcg_gen_extrl_i64_i32(val32, val);
+        tcg_gen_mov_tl(hex_new_value[rnum], val32);
+#if HEX_DEBUG
+        /* Do this so HELPER(debug_commit_end) will know */
+        tcg_gen_movi_tl(hex_reg_written[rnum], 1);
+#endif
+
+        /* High word */
+        tcg_gen_extrh_i64_i32(val32, val);
+        tcg_gen_mov_tl(hex_new_value[rnum + 1], val32);
+#if HEX_DEBUG
+        /* Do this so HELPER(debug_commit_end) will know */
+        tcg_gen_movi_tl(hex_reg_written[rnum + 1], 1);
+#endif
+    }
+
+    tcg_temp_free(val32);
+}
+
+static inline void gen_log_pred_write(int pnum, TCGv val)
+{
+    TCGv zero = tcg_const_tl(0);
+    TCGv base_val = tcg_temp_new();
+    TCGv and_val = tcg_temp_new();
+    TCGv pred_written = tcg_temp_new();
+
+    /* Multiple writes to the same preg are and'ed together */
+    tcg_gen_andi_tl(base_val, val, 0xff);
+    tcg_gen_and_tl(and_val, base_val, hex_new_pred_value[pnum]);
+    tcg_gen_andi_tl(pred_written, hex_pred_written, 1 << pnum);
+    tcg_gen_movcond_tl(TCG_COND_NE, hex_new_pred_value[pnum],
+                       pred_written, zero,
+                       and_val, base_val);
+    tcg_gen_ori_tl(hex_pred_written, hex_pred_written, 1 << pnum);
+
+    tcg_temp_free(zero);
+    tcg_temp_free(base_val);
+    tcg_temp_free(and_val);
+    tcg_temp_free(pred_written);
+}
+
+static inline void gen_read_p3_0(TCGv control_reg)
+{
+    TCGv pval = tcg_temp_new();
+    int i;
+    tcg_gen_movi_tl(control_reg, 0);
+    for (i = NUM_PREGS - 1; i >= 0; i--) {
+        tcg_gen_shli_tl(control_reg, control_reg, 8);
+        tcg_gen_andi_tl(pval, hex_pred[i], 0xff);
+        tcg_gen_or_tl(control_reg, control_reg, pval);
+    }
+    tcg_temp_free(pval);
+}
+
+static inline void gen_write_p3_0(TCGv tmp)
+{
+    TCGv control_reg = tcg_temp_new();
+    TCGv pred_val = tcg_temp_new();
+    int i;
+
+    tcg_gen_mov_tl(control_reg, tmp);
+    for (i = 0; i < NUM_PREGS; i++) {
+        tcg_gen_andi_tl(pred_val, control_reg, 0xff);
+        tcg_gen_mov_tl(hex_pred[i], pred_val);
+        tcg_gen_shri_tl(control_reg, control_reg, 8);
+    }
+    tcg_temp_free(control_reg);
+    tcg_temp_free(pred_val);
+}
+
+static inline void gen_load_locked4u(TCGv dest, TCGv vaddr, int mem_index)
+{
+    tcg_gen_qemu_ld32u(dest, vaddr, mem_index);
+    tcg_gen_mov_tl(hex_llsc_addr, vaddr);
+    tcg_gen_mov_tl(hex_llsc_val, dest);
+}
+
+static inline void gen_load_locked8u(TCGv_i64 dest, TCGv vaddr, int mem_index)
+{
+    tcg_gen_qemu_ld64(dest, vaddr, mem_index);
+    tcg_gen_mov_tl(hex_llsc_addr, vaddr);
+    tcg_gen_mov_i64(hex_llsc_val_i64, dest);
+}
+
+static inline void gen_store_conditional4(CPUHexagonState *env,
+                                          DisasContext *ctx, int prednum,
+                                          TCGv pred, TCGv vaddr, TCGv src)
+{
+    TCGLabel *fail = gen_new_label();
+    TCGLabel *done = gen_new_label();
+
+    tcg_gen_brcond_tl(TCG_COND_NE, vaddr, hex_llsc_addr, fail);
+
+    TCGv one = tcg_const_tl(0xff);
+    TCGv zero = tcg_const_tl(0);
+    TCGv tmp = tcg_temp_new();
+    tcg_gen_atomic_cmpxchg_tl(tmp, hex_llsc_addr, hex_llsc_val, src,
+                              ctx->mem_idx, MO_32);
+    tcg_gen_movcond_tl(TCG_COND_EQ, hex_pred[prednum], tmp, hex_llsc_val,
+                       one, zero);
+    tcg_temp_free(one);
+    tcg_temp_free(zero);
+    tcg_temp_free(tmp);
+    tcg_gen_br(done);
+
+    gen_set_label(fail);
+    tcg_gen_movi_tl(pred, 0);
+
+    gen_set_label(done);
+    tcg_gen_movi_tl(hex_llsc_addr, ~0);
+}
+
+static inline void gen_store_conditional8(CPUHexagonState *env,
+                                          DisasContext *ctx, int prednum,
+                                          TCGv pred, TCGv vaddr, TCGv_i64 src)
+{
+    TCGLabel *fail = gen_new_label();
+    TCGLabel *done = gen_new_label();
+
+    tcg_gen_brcond_tl(TCG_COND_NE, vaddr, hex_llsc_addr, fail);
+
+    TCGv_i64 one = tcg_const_i64(0xff);
+    TCGv_i64 zero = tcg_const_i64(0);
+    TCGv_i64 tmp = tcg_temp_new_i64();
+    tcg_gen_atomic_cmpxchg_i64(tmp, hex_llsc_addr, hex_llsc_val_i64, src,
+                               ctx->mem_idx, MO_64);
+    tcg_gen_movcond_i64(TCG_COND_EQ, tmp, tmp, hex_llsc_val_i64,
+                        one, zero);
+    tcg_gen_extrl_i64_i32(hex_pred[prednum], tmp);
+    tcg_temp_free_i64(one);
+    tcg_temp_free_i64(zero);
+    tcg_temp_free_i64(tmp);
+    tcg_gen_br(done);
+
+    gen_set_label(fail);
+    tcg_gen_movi_tl(pred, 0);
+
+    gen_set_label(done);
+    tcg_gen_movi_tl(hex_llsc_addr, ~0);
+}
+
+#endif
diff --git a/target/hexagon/op_helper.c b/target/hexagon/op_helper.c
index 2ea4e70..a234cf6 100644
--- a/target/hexagon/op_helper.c
+++ b/target/hexagon/op_helper.c
@@ -88,6 +88,24 @@ static inline void log_pred_write(CPUHexagonState *env, int pnum,
     }
 }
 
+static inline void log_store32(CPUHexagonState *env, target_ulong addr,
+                               int32_t val, int width, int slot)
+{
+    HEX_DEBUG_LOG("log_store%d(0x%x, %d [0x%x])\n", width, addr, val, val);
+    env->mem_log_stores[slot].va = addr;
+    env->mem_log_stores[slot].width = width;
+    env->mem_log_stores[slot].data32 = val;
+}
+
+static inline void log_store64(CPUHexagonState *env, target_ulong addr,
+                               int64_t val, int width, int slot)
+{
+    HEX_DEBUG_LOG("log_store%d(0x%x, %ld [0x%lx])\n", width, addr, val, val);
+    env->mem_log_stores[slot].va = addr;
+    env->mem_log_stores[slot].width = width;
+    env->mem_log_stores[slot].data64 = val;
+}
+
 static inline void write_new_pc(CPUHexagonState *env, target_ulong addr)
 {
     HEX_DEBUG_LOG("write_new_pc(0x" TARGET_FMT_lx ")\n", addr);
-- 
2.7.4