src/code/mips-vm.lisp

   1 ;;; This file contains the MIPS specific runtime stuff.
   2 ;;;
   3 (in-package "SB!VM")
   4
   5 \f
   6 (define-alien-type os-context-t (struct os-context-t-struct))
   7 (define-alien-type os-context-register-t unsigned-long-long)
   8
   9 \f
  10 ;;;; MACHINE-TYPE and MACHINE-VERSION
  11
  12 (defun machine-type ()
  13   "Returns a string describing the type of the local machine."
  14   "MIPS")
  15
  16 ;;; support for CL:MACHINE-VERSION defined OAOO elsewhere
  17 (defun get-machine-version ()
  18   #!+little-endian "little-endian"
  19   #!-little-endian "big-endian")
  20
  21 \f
  22 ;;;; FIXUP-CODE-OBJECT
  23
  24 (defun fixup-code-object (code offset value kind)
  25   (declare (type index offset))
  26   (unless (zerop (rem offset n-word-bytes))
  27     (error "Unaligned instruction?  offset=#x~X." offset))
  28   (sb!sys:without-gcing
  29    (let ((sap (truly-the system-area-pointer
  30                          (%primitive sb!c::code-instructions code))))
  31      (ecase kind
  32        (:jump
  33         (aver (zerop (ash value -28)))
  34         (setf (ldb (byte 26 0) (sap-ref-32 sap offset))
  35               (ash value -2)))
  36        (:lui
  37         (setf (ldb (byte 16 0) (sap-ref-32 sap offset))
  38               (ash (1+ (ash value -15)) -1)))
  39        (:addi
  40         (setf (ldb (byte 16 0) (sap-ref-32 sap offset))
  41               (ldb (byte 16 0) value)))))))
  42
  43 \f
  44 (define-alien-routine ("os_context_pc_addr" context-pc-addr)
  45     (* os-context-register-t)
  46   (context (* os-context-t) :in))
  47
  48 (defun context-pc (context)
  49   (declare (type (alien (* os-context-t)) context))
  50   (int-sap (deref (context-pc-addr context))))
  51
  52 (define-alien-routine ("os_context_register_addr" context-register-addr)
  53     (* os-context-register-t)
  54   (context (* os-context-t) :in)
  55   (index int :in))
  56
  57 (define-alien-routine ("os_context_bd_cause" context-bd-cause-int)
  58     unsigned-int
  59   (context (* os-context-t) :in))
  60
  61 ;;; FIXME: Should this and CONTEXT-PC be INLINE to reduce consing?
  62 ;;; (Are they used in anything time-critical, or just the debugger?)
  63 (defun context-register (context index)
  64   (declare (type (alien (* os-context-t)) context))
  65   (let ((addr (context-register-addr context index)))
  66     (declare (type (alien (* os-context-register-t)) addr))
  67     (deref addr)))
  68
  69 (defun %set-context-register (context index new)
  70   (declare (type (alien (* os-context-t)) context))
  71   (let ((addr (context-register-addr context index)))
  72     (declare (type (alien (* os-context-register-t)) addr))
  73     (setf (deref addr) new)))
  74
  75 ;;; This is like CONTEXT-REGISTER, but returns the value of a float
  76 ;;; register. FORMAT is the type of float to return.
  77
  78 ;;; FIXME: Whether COERCE actually knows how to make a float out of a
  79 ;;; long is another question. This stuff still needs testing.
  80 (define-alien-routine ("os_context_fpregister_addr" context-float-register-addr)
  81     (* os-context-register-t)
  82   (context (* os-context-t))
  83   (index int))
  84
  85 (defun context-float-register (context index format)
  86   (declare (type (alien (* os-context-t)) context))
  87   (let ((addr (context-float-register-addr context index)))
  88     (declare (type (alien (* os-context-register-t)) addr))
  89     (coerce (deref addr) format)))
  90
  91 (defun %set-context-float-register (context index format new)
  92   (declare (type (alien (* os-context-t)) context))
  93   (let ((addr (context-float-register-addr context index)))
  94     (declare (type (alien (* os-context-register-t)) addr))
  95     (setf (deref addr) (coerce new format))))
  96
  97 ;;; Given a signal context, return the floating point modes word in
  98 ;;; the same format as returned by FLOATING-POINT-MODES.
  99 (define-alien-routine ("os_context_fp_control" context-floating-point-modes)
 100     unsigned-int
 101   (context (* os-context-t)))
 102
 103 ;;;; Internal-error-arguments.
 104
 105 ;;; INTERNAL-ERROR-ARGUMENTS -- interface.
 106 ;;;
 107 ;;; Given the sigcontext, extract the internal error arguments from the
 108 ;;; instruction stream.  This is e.g.
 109 ;;; 4       23      254     206     1       0       0       0
 110 ;;; |       ~~~~~~~~~~~~~~~~~~~~~~~~~
 111 ;;; length         data              (everything is an octet)
 112 ;;; (pc + 4)
 113 (defun internal-error-args (context)
 114   (declare (type (alien (* os-context-t)) context))
 115   (/show0 "entering INTERNAL-ERROR-ARGS, CONTEXT=..")
 116   (/hexstr context)
 117   (let ((pc (context-pc context))
 118         (cause (context-bd-cause-int context)))
 119     (declare (type system-area-pointer pc))
 120     (multiple-value-bind (error-number length sc-offsets)
 121         ;; KLUDGE: This exposure of the branch delay mechanism hurts.
 122         (snarf-error-junk pc (if (logbitp 31 cause) 8 4))
 123       (declare (ignore length))
 124       (values error-number sc-offsets))))