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 (%primitive sb!c::code-instructions code)))
  30      (ecase kind
  31        (:jump
  32         (aver (zerop (ash value -28)))
  33         (setf (ldb (byte 26 0) (sap-ref-32 sap offset))
  34               (ash value -2)))
  35        (:lui
  36         (setf (ldb (byte 16 0) (sap-ref-32 sap offset))
  37               (ash (1+ (ash value -15)) -1)))
  38        (:addi
  39         (setf (ldb (byte 16 0) (sap-ref-32 sap offset))
  40               (ldb (byte 16 0) value)))))))
  41
  42 \f
  43 (define-alien-routine ("os_context_pc_addr" context-pc-addr)
  44     (* os-context-register-t)
  45   (context (* os-context-t) :in))
  46
  47 (defun context-pc (context)
  48   (declare (type (alien (* os-context-t)) context))
  49   (int-sap (deref (context-pc-addr context))))
  50
  51 (define-alien-routine ("os_context_register_addr" context-register-addr)
  52     (* os-context-register-t)
  53   (context (* os-context-t) :in)
  54   (index int :in))
  55
  56 (define-alien-routine ("os_context_bd_cause" context-bd-cause-int)
  57     unsigned-int
  58   (context (* os-context-t) :in))
  59
  60 ;;; FIXME: Should this and CONTEXT-PC be INLINE to reduce consing?
  61 ;;; (Are they used in anything time-critical, or just the debugger?)
  62 (defun context-register (context index)
  63   (declare (type (alien (* os-context-t)) context))
  64   (let ((addr (context-register-addr context index)))
  65     (declare (type (alien (* os-context-register-t)) addr))
  66     (deref addr)))
  67
  68 (defun %set-context-register (context index new)
  69   (declare (type (alien (* os-context-t)) context))
  70   (let ((addr (context-register-addr context index)))
  71     (declare (type (alien (* os-context-register-t)) addr))
  72     (setf (deref addr) new)))
  73
  74 ;;; This is like CONTEXT-REGISTER, but returns the value of a float
  75 ;;; register. FORMAT is the type of float to return.
  76
  77 ;;; FIXME: Whether COERCE actually knows how to make a float out of a
  78 ;;; long is another question. This stuff still needs testing.
  79 (define-alien-routine ("os_context_fpregister_addr" context-float-register-addr)
  80     (* os-context-register-t)
  81   (context (* os-context-t) :in)
  82   (index int :in))
  83
  84 (defun context-float-register (context index format)
  85   (declare (type (alien (* os-context-t)) context))
  86   (let ((addr (context-float-register-addr context index)))
  87     (declare (type (alien (* os-context-register-t)) addr))
  88     (coerce (deref addr) format)))
  89
  90 (defun %set-context-float-register (context index format new)
  91   (declare (type (alien (* os-context-t)) context))
  92   (let ((addr (context-float-register-addr context index)))
  93     (declare (type (alien (* os-context-register-t)) addr))
  94     (setf (deref addr) (coerce new format))))
  95
  96 (define-alien-routine
  97     ("arch_get_fp_control" floating-point-modes) unsigned-int)
  98
  99 (define-alien-routine
 100     ("arch_set_fp_control" %floating-point-modes-setter) void (fp unsigned-int :in))
 101
 102 (defun (setf floating-point-modes) (val) (%floating-point-modes-setter val))
 103
 104 ;;; Given a signal context, return the floating point modes word in
 105 ;;; the same format as returned by FLOATING-POINT-MODES.
 106 (define-alien-routine ("os_context_fp_control" context-floating-point-modes)
 107     unsigned-int
 108   (context (* os-context-t) :in))
 109
 110 ;;;; Internal-error-arguments.
 111
 112 ;;; INTERNAL-ERROR-ARGUMENTS -- interface.
 113 ;;;
 114 ;;; Given the sigcontext, extract the internal error arguments from the
 115 ;;; instruction stream.  This is e.g.
 116 ;;; 4       23      254     206     1       0       0       0
 117 ;;; |       ~~~~~~~~~~~~~~~~~~~~~~~~~
 118 ;;; length         data              (everything is an octet)
 119 ;;; (pc + 4)
 120 (defun internal-error-args (context)
 121   (declare (type (alien (* os-context-t)) context))
 122   (/show0 "entering INTERNAL-ERROR-ARGS, CONTEXT=..")
 123   (/hexstr context)
 124   (let ((pc (context-pc context))
 125         (cause (context-bd-cause-int context)))
 126     (declare (type system-area-pointer pc))
 127     (multiple-value-bind (error-number length sc-offsets)
 128         ;; KLUDGE: This exposure of the branch delay mechanism hurts.
 129         (snarf-error-junk pc (if (logbitp 31 cause) 8 4))
 130       (declare (ignore length))
 131       (values error-number sc-offsets))))