qemu/target-riscv-vector_helper.c-fix-vmvr_v-memcpy-endia.patch

From 1c6b234766bae8c2b518cfd882e8907b831d8d03 Mon Sep 17 00:00:00 2001
From: gubin <gubin_yewu@cmss.chinamobile.com>
Date: Sat, 11 Jan 2025 11:10:29 +0800
Subject: [PATCH] target/riscv/vector_helper.c: fix 'vmvr_v' memcpy endianess

cherry-pick from 768e7b329c0be22035da077fe76221dd0a47103b

vmvr_v isn't handling the case where the host might be big endian and
the bytes to be copied aren't sequential.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Fixes: f714361ed7 ("target/riscv: rvv-1.0: implement vstart CSR")
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240314175704.478276-4-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: gubin <gubin_yewu@cmss.chinamobile.com>
---
 target/riscv/vector_helper.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
index 42ffd3a68a..351842f66a 100644
--- a/target/riscv/vector_helper.c
+++ b/target/riscv/vector_helper.c
@@ -5063,9 +5063,17 @@ void HELPER(vmvr_v)(void *vd, void *vs2, CPURISCVState *env, uint32_t desc)
     uint32_t startb = env->vstart * sewb;
     uint32_t i = startb;
 
+    if (HOST_BIG_ENDIAN && i % 8 != 0) {
+        uint32_t j = ROUND_UP(i, 8);
+        memcpy((uint8_t *)vd + H1(j - 1),
+               (uint8_t *)vs2 + H1(j - 1),
+               j - i);
+        i = j;
+    }
+
     memcpy((uint8_t *)vd + H1(i),
            (uint8_t *)vs2 + H1(i),
-           maxsz - startb);
+           maxsz - i);
 
     env->vstart = 0;
 }
-- 
2.41.0.windows.1