src/code/mips-vm.lisp

   1 ;;; This file contains the MIPS specific runtime stuff.
   2 ;;;
   3 (in-package "SB-VM")
   4
   5 (defun machine-type ()
   6   "Returns a string describing the type of the local machine."
   7   "MIPS")
   8
   9 (defun return-machine-address (scp)
  10   (context-register scp lip-offset))
  11
  12 (define-alien-routine ("os_context_bd_cause" context-bd-cause-int)
  13     unsigned-int
  14   (context (* os-context-t) :in))
  15
  16 ;;; This is like CONTEXT-REGISTER, but returns the value of a float
  17 ;;; register. FORMAT is the type of float to return.
  18
  19 ;;; FIXME: Whether COERCE actually knows how to make a float out of a
  20 ;;; long is another question. This stuff still needs testing.
  21 (define-alien-type os-context-register-t unsigned-long-long)
  22 (define-alien-routine ("os_context_fpregister_addr" context-float-register-addr)
  23     (* os-context-register-t)
  24   (context (* os-context-t) :in)
  25   (index int :in))
  26
  27 (defun context-float-register (context index format)
  28   (declare (type (alien (* os-context-t)) context))
  29   (let ((addr (context-float-register-addr context index)))
  30     (declare (type (alien (* os-context-register-t)) addr))
  31     (coerce (deref addr) format)))
  32
  33 (defun %set-context-float-register (context index format new)
  34   (declare (type (alien (* os-context-t)) context))
  35   (let ((addr (context-float-register-addr context index)))
  36     (declare (type (alien (* os-context-register-t)) addr))
  37     (setf (deref addr) (coerce new format))))
  38
  39 (define-alien-routine
  40     ("arch_get_fp_control" floating-point-modes) unsigned-int)
  41
  42 (define-alien-routine
  43     ("arch_set_fp_control" %floating-point-modes-setter) void (fp unsigned-int :in))
  44
  45 (defun (setf floating-point-modes) (val) (%floating-point-modes-setter val))
  46
  47 ;;; Given a signal context, return the floating point modes word in
  48 ;;; the same format as returned by FLOATING-POINT-MODES.
  49 (define-alien-routine ("os_context_fp_control" context-floating-point-modes)
  50     unsigned-int
  51   (context (* os-context-t) :in))
  52
  53 (defun internal-error-args (context)
  54   (declare (type (alien (* os-context-t)) context))
  55   (let* ((pc (context-pc context))
  56          (cause (context-bd-cause-int context))
  57          ;; KLUDGE: This exposure of the branch delay mechanism hurts.
  58          (offset (if (logbitp 31 cause) 4 0))
  59          (trap-number (ldb (byte 8 6) (sap-ref-32 pc offset))))
  60     (declare (type system-area-pointer pc))
  61     ;; Pick off invalid-arg-count here. Otherwise call the generic routine
  62     (let ((inst (sap-ref-32 pc offset)))
  63       ;; FIXME: recognize the whole gamut of trap instructions
  64       (cond ((and (= (ldb (byte 6 0) inst) #b110110) ; TNE
  65                   (= (ldb (byte 10 6) inst) invalid-arg-count-trap))
  66              (let ((rs (ldb (byte 5 21) inst))) ; expect this to be NARGS-TN
  67                (values (error-number-or-lose 'invalid-arg-count-error)
  68                        (list (make-sc+offset (sc-number-or-lose 'any-reg) rs))
  69                        invalid-arg-count-trap)))
  70             (t
  71              (sb-kernel::decode-internal-error-args (sap+ pc (+ offset 4)) trap-number))))))