PTR p2;
long x1,x2;
- /* Callbacks for reading/writing memory (e.g. for read/write syscalls). */
- unsigned long (*read_mem) PARAMS ((host_callback *, struct cb_syscall *, unsigned long taddr, char *buf, unsigned long bytes));
- unsigned long (*write_mem) PARAMS ((host_callback *, struct cb_syscall *, unsigned long taddr, const char *buf, unsigned long bytes));
+ /* Callbacks for reading/writing memory (e.g. for read/write syscalls).
+ ??? long or unsigned long might be better to use for the `count'
+ argument here. We mimic sim_{read,write} for now. Be careful to
+ test any changes with -Wall -Werror, mixed signed comparisons
+ will get you. */
+ int (*read_mem) PARAMS ((host_callback * /*cb*/, struct cb_syscall * /*sc*/,
+ unsigned long /*taddr*/, char * /*buf*/,
+ int /*bytes*/));
+ int (*write_mem) PARAMS ((host_callback * /*cb*/, struct cb_syscall * /*sc*/,
+ unsigned long /*taddr*/, const char * /*buf*/,
+ int /*bytes*/));
+
+ /* For sanity checking, should be last entry. */
+ int magic;
} CB_SYSCALL;
+
+/* Magic number sanity checker. */
+#define CB_SYSCALL_MAGIC 0x12344321
+
+/* Macro to initialize CB_SYSCALL. Called first, before filling in
+ any fields. */
+#define CB_SYSCALL_INIT(sc) \
+do { \
+ memset ((sc), 0, sizeof (*(sc))); \
+ (sc)->magic = CB_SYSCALL_MAGIC; \
+} while (0)
\f
/* Return codes for various interface routines. */