semihosting: Split out semihost_sys_lseek
Split out the non-ARM specific portions of SYS_SEEK to a
reusable function. This handles all GuestFD. Isolate the
curious ARM-specific return value processing to a new
callback, common_semi_seek_cb.
Expand the internal type of the offset to int64_t, and
provide the whence argument, which will be required by
m68k and nios2 semihosting.
Note that gdb_do_syscall %x reads target_ulong, not int.
Reviewed-by: Luc Michel <lmichel@kalray.eu>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h
index 95a8b7b..b588c30 100644
--- a/include/exec/gdbstub.h
+++ b/include/exec/gdbstub.h
@@ -41,6 +41,11 @@
#define GDB_ENAMETOOLONG 91
#define GDB_EUNKNOWN 9999
+/* For gdb file i/o remote protocol lseek whence. */
+#define GDB_SEEK_SET 0
+#define GDB_SEEK_CUR 1
+#define GDB_SEEK_END 2
+
/* For gdb file i/o stat/fstat. */
typedef uint32_t gdb_mode_t;
typedef uint32_t gdb_time_t;
diff --git a/include/semihosting/syscalls.h b/include/semihosting/syscalls.h
index 2464467..841a93d 100644
--- a/include/semihosting/syscalls.h
+++ b/include/semihosting/syscalls.h
@@ -39,4 +39,7 @@
void semihost_sys_write_gf(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, target_ulong buf, target_ulong len);
+void semihost_sys_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
+ int fd, int64_t off, int gdb_whence);
+
#endif /* SEMIHOSTING_SYSCALLS_H */
