[PATCH for-7.1 5/5] target/loongarch: Update gdb_set_fpu() and gdb_get_fpu()

From: Song Gao <gaosong@loongson.cn>
To: qemu-devel@nongnu.org
Cc: richard.henderson@linaro.org, peter.maydell@linaro.org,
	gaosong@loongson.cn, f4bug@amsat.org, alex.bennee@linaro.org,
	yangxiaojuan@loongson.cn
Subject: [PATCH for-7.1 5/5] target/loongarch: Update gdb_set_fpu() and gdb_get_fpu()
Date: Thu,  4 Aug 2022 21:02:13 +0800	[thread overview]
Message-ID: <20220804130213.1364164-6-gaosong@loongson.cn> (raw)
In-Reply-To: <20220804130213.1364164-1-gaosong@loongson.cn>

GDB LoongArch fpu use fcc register,  update gdb_set_fpu() and gdb_get_fpu() to match it.

Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 target/loongarch/gdbstub.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/target/loongarch/gdbstub.c b/target/loongarch/gdbstub.c
index 7d95b4b11c..265f0f43b6 100644
--- a/target/loongarch/gdbstub.c
+++ b/target/loongarch/gdbstub.c
@@ -51,9 +51,14 @@ static int loongarch_gdb_get_fpu(CPULoongArchState *env,
 {
     if (0 <= n && n < 32) {
         return gdb_get_reg64(mem_buf, env->fpr[n]);
-    } else if (32 <= n && n < 40) {
-        return gdb_get_reg8(mem_buf, env->cf[n - 32]);
-    } else if (n == 40) {
+    } else if (n == 32) {
+        /* fcc */
+        uint64_t val = 0;
+        for (int i = 0; i < 8; ++i) {
+            val |= (uint64_t)env->cf[i] << (i * 8);
+        }
+        return gdb_get_reg64(mem_buf, val);
+    } else if (n == 33) {
         return gdb_get_reg32(mem_buf, env->fcsr0);
     }
     return 0;
@@ -67,10 +72,14 @@ static int loongarch_gdb_set_fpu(CPULoongArchState *env,
     if (0 <= n && n < 32) {
         env->fpr[n] = ldq_p(mem_buf);
         length = 8;
-    } else if (32 <= n && n < 40) {
-        env->cf[n - 32] = ldub_p(mem_buf);
-        length = 1;
-    } else if (n == 40) {
+    } else if (n == 32) {
+        /* fcc */
+        uint64_t val = ldq_p(mem_buf);
+        for (int i = 0; i < 8; ++i) {
+            env->cf[i] = (val >> (i * 8)) & 1;
+        }
+        length = 8;
+    } else if (n == 33) {
         env->fcsr0 = ldl_p(mem_buf);
         length = 4;
     }
-- 
2.31.1


