Add a new memory map flag to support an auxilliary buffer for translating code from MMAP_PTR_IDX chunks for which the pointer is null

2 files changed, 5 insertions, 0 deletions

diff --git a/backend.c b/backend.c
index 1f9e718..c42a7a0 100644
--- a/backend.c
+++ b/backend.c
@@ -65,6 +65,9 @@ void * get_native_pointer(uint32_t address, void ** mem_pointers, cpu_options *
 				? mem_pointers[memmap[chunk].ptr_index]
 				: memmap[chunk].buffer;
 			if (!base) {
+				if (memmap[chunk].flags & MMAP_AUX_BUFF) {
+					return memmap[chunk].buffer + (address & memmap[chunk].aux_mask);
+				}
 				return NULL;
 			}
 			return base + (address & memmap[chunk].mask);
diff --git a/backend.h b/backend.h
index 8c2b1b2..89e5e2e 100644
--- a/backend.h
+++ b/backend.h
@@ -55,6 +55,7 @@ typedef enum {
 #define MMAP_ONLY_EVEN 0x20
 #define MMAP_FUNC_NULL 0x40
 #define MMAP_BYTESWAP  0x80
+#define MMAP_AUX_BUFF  0x100
 
 typedef uint16_t (*read_16_fun)(uint32_t address, void * context);
 typedef uint8_t (*read_8_fun)(uint32_t address, void * context);
@@ -65,6 +66,7 @@ typedef struct {
 	uint32_t     start;
 	uint32_t     end;
 	uint32_t     mask;
+	uint32_t     aux_mask;
 	uint16_t     ptr_index;
 	uint16_t     flags;
 	void *       buffer;