[PATCH v2] hvf: arm: sign extend when SSE=1

[Joelle van Dyne]

According to the ARM manual, when SSE=1 the data item must be sign
extended.

Signed-off-by: Joelle van Dyne <j...@getutm.app>
---
 target/arm/hvf/hvf.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index 0afd96018e..43cf250eef 100644
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -1971,6 +1971,7 @@ int hvf_vcpu_exec(CPUState *cpu)
         bool isv = syndrome & ARM_EL_ISV;
         bool iswrite = (syndrome >> 6) & 1;
         bool s1ptw = (syndrome >> 7) & 1;
+        bool sse = (syndrome >> 21) & 1;
         uint32_t sas = (syndrome >> 22) & 3;
         uint32_t len = 1 << sas;
         uint32_t srt = (syndrome >> 16) & 0x1f;
@@ -1998,6 +1999,9 @@ int hvf_vcpu_exec(CPUState *cpu)
             address_space_read(&address_space_memory,
                                hvf_exit->exception.physical_address,
                                MEMTXATTRS_UNSPECIFIED, &val, len);
+            if (sse && len != sizeof(uint64_t)) {
+                val = sextract64(val, 0, len * 8);
+            }
             hvf_set_reg(cpu, srt, val);
         }
 
-- 
2.41.0