# HG changeset patch
# User Michael Pavone <pavone@retrodev.com>
# Date 1552453055 25200
# Node ID e59045f781ce425dd38b5d4f935214714de9c352
# Parent  a81db00e171a5c6985f497253957a80a5ea8c817
Fix a couple issues in manual memory map read/write functions

diff -r a81db00e171a -r e59045f781ce backend.c
--- a/backend.c	Tue Mar 12 21:57:13 2019 -0700
+++ b/backend.c	Tue Mar 12 21:57:35 2019 -0700
@@ -162,7 +162,7 @@
 	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) {
@@ -212,6 +212,8 @@
 					return 0xFF;
 				}
 				offset /= 2;
+			} else if(opts->byte_swap) {
+				offset ^= 1;
 			}
 			return base[offset];
 		}
@@ -246,6 +248,8 @@
 					return;
 				}
 				offset /= 2;
+			} else if(opts->byte_swap) {
+				offset ^= 1;
 			}
 			base[offset] = value;
 		}