[Crash-utility] [PATCH V3 2/3] Implement byte-by-byte memory access facilitators
Sparc64 requires type-aligned memory access. Since data buffers may not
be properly aligned, implement a safe copy from memory per data type.
Signed-off-by: Dave Kleikamp <dave.kleikamp(a)oracle.com>
---
defs.h | 41 +++++++++++++++++++++++++++++++++++++++++
1 files changed, 41 insertions(+), 0 deletions(-)
diff --git a/defs.h b/defs.h
index e3afc58..d9d4559 100644
--- a/defs.h
+++ b/defs.h
@@ -2187,6 +2187,45 @@ struct builtin_debug_table {
* Facilitators for pulling correctly-sized data out of a buffer at a
* known address.
*/
+
+#ifdef NEED_ALIGNED_MEM_ACCESS
+
+#define DEF_LOADER(TYPE) \
+static inline TYPE \
+load_##TYPE (char *addr) \
+{ \
+ TYPE ret; \
+ size_t i = sizeof(TYPE); \
+ while (i--) \
+ ((char *)&ret)[i] = addr[i]; \
+ return ret; \
+}
+
+DEF_LOADER(int);
+DEF_LOADER(uint);
+DEF_LOADER(long);
+DEF_LOADER(ulong);
+DEF_LOADER(ulonglong);
+DEF_LOADER(ushort);
+DEF_LOADER(short);
+typedef void *pointer_t;
+DEF_LOADER(pointer_t);
+
+#define LOADER(TYPE) load_##TYPE
+
+#define INT(ADDR) LOADER(int) ((char *)(ADDR))
+#define UINT(ADDR) LOADER(uint) ((char *)(ADDR))
+#define LONG(ADDR) LOADER(long) ((char *)(ADDR))
+#define ULONG(ADDR) LOADER(ulong) ((char *)(ADDR))
+#define ULONGLONG(ADDR) LOADER(ulonglong) ((char *)(ADDR))
+#define ULONG_PTR(ADDR) ((ulong *) (LOADER(pointer_t) ((char *)(ADDR))))
+#define USHORT(ADDR) LOADER(ushort) ((char *)(ADDR))
+#define SHORT(ADDR) LOADER(short) ((char *)(ADDR))
+#define UCHAR(ADDR) *((unsigned char *)((char *)(ADDR)))
+#define VOID_PTR(ADDR) ((void *) (LOADER(pointer_t) ((char *)(ADDR))))
+
+#else
+
#define INT(ADDR) *((int *)((char *)(ADDR)))
#define UINT(ADDR) *((uint *)((char *)(ADDR)))
#define LONG(ADDR) *((long *)((char *)(ADDR)))
@@ -2198,6 +2237,8 @@ struct builtin_debug_table {
#define UCHAR(ADDR) *((unsigned char *)((char *)(ADDR)))
#define VOID_PTR(ADDR) *((void **)((char *)(ADDR)))
+#endif /* NEED_ALIGNED_MEM_ACCESS */
+
struct node_table {
int node_id;
ulong pgdat;
--
1.7.1