# HG changeset patch
# User Michael Pavone <pavone@retrodev.com>
# Date 1588573443 25200
# Node ID 9d35ce5012a65e48f3ef48b549679462c953978e
# Parent  495569c1dc614875e8a7aef2f861fea915204d8d
Apply fixes to helper functions in backend.c from interp branch

diff -r 495569c1dc61 -r 9d35ce5012a6 backend.c
--- a/backend.c	Tue Apr 28 22:03:04 2020 +1000
+++ b/backend.c	Sun May 03 23:24:03 2020 -0700
@@ -160,7 +160,7 @@
 	if (!chunk) {
 		return;
 	}
-	uint32_t offset = (address - chunk->start) & chunk->mask;
+	uint32_t offset = address & chunk->mask;
 	if (chunk->flags & MMAP_WRITE) {
 		uint8_t *base;
 		if (chunk->flags & MMAP_PTR_IDX) {
@@ -210,6 +210,8 @@
 					return 0xFF;
 				}
 				offset /= 2;
+			} else if(opts->byte_swap) {
+				offset ^= 1;
 			}
 			return base[offset];
 		}
@@ -244,6 +246,8 @@
 					return;
 				}
 				offset /= 2;
+			} else if(opts->byte_swap) {
+				offset ^= 1;
 			}
 			base[offset] = value;
 		}