esp.c: add FIFO wraparound support to esp_fifo_pop_buf()

The fifo8_pop_buf() function returns a pointer to the FIFO buffer up to the
specified length. Since the FIFO buffer is modelled as an array then once
the FIFO wraps around, only the continuous portion of the buffer can be
returned.

In future the use of continuous and unaligned accesses will advance the
internal FIFO head pointer, so modify esp_fifo_pop_buf() to ensure that
any wraparound content is also returned up to the requested length.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Helge Deller <deller@gmx.de>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20240112125420.514425-4-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index b3828654261e41be9544d78077e55af7752b3d96..8d8f6a817a2660aeec53494815e0e15a534f4084 100644 (file)
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -121,17 +121,30 @@ static uint8_t esp_fifo_pop(Fifo8 *fifo)
 static uint32_t esp_fifo_pop_buf(Fifo8 *fifo, uint8_t *dest, int maxlen)
 {
     const uint8_t *buf;
-    uint32_t n;
+    uint32_t n, n2;
+    int len;
 
     if (maxlen == 0) {
         return 0;
     }
 
-    buf = fifo8_pop_buf(fifo, maxlen, &n);
+    len = maxlen;
+    buf = fifo8_pop_buf(fifo, len, &n);
     if (dest) {
         memcpy(dest, buf, n);
     }
 
+    /* Add FIFO wraparound if needed */
+    len -= n;
+    len = MIN(len, fifo8_num_used(fifo));
+    if (len) {
+        buf = fifo8_pop_buf(fifo, len, &n2);
+        if (dest) {
+            memcpy(&dest[n], buf, n2);
+        }
+        n += n2;
+    }
+
     return n;
 }