src/code/mips-vm.lisp

   1 (in-package "SB!VM")
   2 \f
   3 (define-alien-type os-context-t (struct os-context-t-struct))
   4 \f
   5 ;;;; MACHINE-TYPE and MACHINE-VERSION
   6
   7 (defun machine-type ()
   8   "Returns a string describing the type of the local machine."
   9   "MIPS")
  10
  11 ;;; support for CL:MACHINE-VERSION defined OAOO elsewhere
  12 (defun get-machine-version ()
  13   #!+little-endian "little-endian"
  14   #!-little-endian "big-endian")
  15 \f
  16 ;;;; FIXUP-CODE-OBJECT
  17
  18 (defun fixup-code-object (code offset value kind)
  19   (unless (zerop (rem offset n-word-bytes))
  20     (error "Unaligned instruction?  offset=#x~X." offset))
  21   (sb!sys:without-gcing
  22    (let ((sap (truly-the system-area-pointer
  23                          (%primitive sb!c::code-instructions code))))
  24      (ecase kind
  25        (:jump
  26         (aver (zerop (ash value -28)))
  27         (setf (ldb (byte 26 0) (sap-ref-32 sap offset))
  28               (ash value -2)))
  29        (:lui
  30         (setf (sap-ref-16 sap
  31                           #!+little-endian offset
  32                           #!-little-endian (+ offset 2))
  33               (+ (ash value -16)
  34                  (if (logbitp 15 value) 1 0))))
  35        (:addi
  36         (setf (sap-ref-16 sap
  37                           #!+little-endian offset
  38                           #!-little-endian (+ offset 2))
  39               (ldb (byte 16 0) value)))))))
  40
  41 \f
  42 (define-alien-routine ("os_context_pc_addr" context-pc-addr) (* unsigned-int)
  43   (context (* os-context-t)))
  44
  45 (defun context-pc (context)
  46   (declare (type (alien (* os-context-t)) context))
  47   ;; KLUDGE: this sucks, and furthermore will break on either of (a)
  48   ;; porting back to IRIX or (b) running on proper 64-bit support.
  49   ;; Linux on the MIPS defines its registers in the sigcontext as
  50   ;; 64-bit quantities ("unsigned long long"), presumably to be
  51   ;; binary-compatible with 64-bit mode.  Since there appears not to
  52   ;; be ALIEN support for 64-bit return values, we have to do the
  53   ;; hacky pointer arithmetic thing.  -- CSR, 2002-09-01
  54   (int-sap (deref (context-pc-addr context)
  55                   #!-little-endian 1
  56                   ;; Untested
  57                   #!+little-endian 0)))
  58
  59 (define-alien-routine ("os_context_register_addr" context-register-addr)
  60   (* unsigned-int)
  61   (context (* os-context-t))
  62   (index int))
  63
  64 (define-alien-routine ("os_context_bd_cause" context-bd-cause-int)
  65     (unsigned 32)
  66   (context (* os-context-t)))
  67
  68 ;;; FIXME: Should this and CONTEXT-PC be INLINE to reduce consing?
  69 ;;; (Are they used in anything time-critical, or just the debugger?)
  70 (defun context-register (context index)
  71   (declare (type (alien (* os-context-t)) context))
  72   (deref (context-register-addr context index)
  73          #!-little-endian 1
  74          #!+little-endian 0))
  75
  76 (defun %set-context-register (context index new)
  77   (declare (type (alien (* os-context-t)) context))
  78   (setf (deref (context-register-addr context index)
  79                #!-little-endian 1
  80                #!+little-endian 0)
  81         new))
  82
  83 #!+linux
  84 ;;; For now.
  85 (defun context-floating-point-modes (context)
  86   (declare (ignore context))
  87   (warn "stub CONTEXT-FLOATING-POINT-MODES")
  88   0)
  89
  90 ;;;; Internal-error-arguments.
  91
  92 ;;; INTERNAL-ERROR-ARGUMENTS -- interface.
  93 ;;;
  94 ;;; Given the sigcontext, extract the internal error arguments from the
  95 ;;; instruction stream.
  96 ;;;
  97 (defun internal-error-args (context)
  98   (declare (type (alien (* os-context-t)) context))
  99   (/show0 "entering INTERNAL-ERROR-ARGS, CONTEXT=..")
 100   (/hexstr context)
 101   (let ((pc (context-pc context))
 102         (cause (context-bd-cause-int context)))
 103     (declare (type system-area-pointer pc))
 104     (/show0 "got PC=..")
 105     (/hexstr (sap-int pc))
 106     ;; KLUDGE: This exposure of the branch delay mechanism hurts.
 107     (when (logbitp 31 cause)
 108       (setf pc (sap+ pc 4)))
 109     (when (= (sap-ref-8 pc 4) 255)
 110       (setf pc (sap+ pc 1)))
 111     (/show0 "now PC=..")
 112     (/hexstr (sap-int pc))
 113     (let* ((length (sap-ref-8 pc 4))
 114            (vector (make-array length :element-type '(unsigned-byte 8))))
 115       (declare (type (unsigned-byte 8) length)
 116                (type (simple-array (unsigned-byte 8) (*)) vector))
 117       (/show0 "LENGTH,VECTOR,ERROR-NUMBER=..")
 118       (/hexstr length)
 119       (/hexstr vector)
 120       (copy-ub8-from-system-area pc 5 vector 0 length)
 121       (let* ((index 0)
 122              (error-number (sb!c:read-var-integer vector index)))
 123         (/hexstr error-number)
 124         (collect ((sc-offsets))
 125          (loop
 126           (/show0 "INDEX=..")
 127           (/hexstr index)
 128           (when (>= index length)
 129             (return))
 130           (sc-offsets (sb!c:read-var-integer vector index)))
 131          (values error-number (sc-offsets)))))))
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