src/code/sparc-vm.lisp

   1 ;;;; SPARC-specific runtime stuff
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   6 ;;;; This software is derived from the CMU CL system, which was
   7 ;;;; written at Carnegie Mellon University and released into the
   8 ;;;; public domain. The software is in the public domain and is
   9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  10 ;;;; files for more information.
  11 (in-package "SB!VM")
  12
  13 \f
  14
  15 ;;; See x86-vm.lisp for a description of this.
  16 (define-alien-type os-context-t (struct os-context-t-struct))
  17
  18
  19 \f
  20 ;;;; MACHINE-TYPE and MACHINE-VERSION
  21
  22 (defun machine-type ()
  23   "Returns a string describing the type of the local machine."
  24   "SPARC")
  25
  26 (defun machine-version ()
  27   "Returns a string describing the version of the local machine."
  28   "SPARC")
  29
  30 \f
  31 (defun fixup-code-object (code offset fixup kind)
  32   (declare (type index offset))
  33   (unless (zerop (rem offset n-word-bytes))
  34     (error "Unaligned instruction?  offset=#x~X." offset))
  35   (sb!sys:without-gcing
  36    (let ((sap (truly-the system-area-pointer
  37                          (%primitive sb!kernel::code-instructions code))))
  38      (ecase kind
  39        (:call
  40         (error "Can't deal with CALL fixups, yet."))
  41        (:sethi
  42         (setf (ldb (byte 22 0) (sap-ref-32 sap offset))
  43               (ldb (byte 22 10) fixup)))
  44        (:add
  45         (setf (ldb (byte 10 0) (sap-ref-32 sap offset))
  46               (ldb (byte 10 0) fixup)))))))
  47
  48 \f
  49 ;;;; "Sigcontext" access functions, cut & pasted from alpha-vm.lisp.
  50 ;;;;
  51 ;;;; See also x86-vm for commentary on signed vs unsigned.
  52
  53 (define-alien-routine ("os_context_pc_addr" context-pc-addr) (* unsigned-int)
  54   (context (* os-context-t)))
  55
  56 (defun context-pc (context)
  57   (declare (type (alien (* os-context-t)) context))
  58   (int-sap (deref (context-pc-addr context))))
  59
  60 (define-alien-routine ("os_context_register_addr" context-register-addr)
  61   (* unsigned-int)
  62   (context (* os-context-t))
  63   (index int))
  64
  65 ;;; FIXME: Should this and CONTEXT-PC be INLINE to reduce consing?
  66 ;;; (Are they used in anything time-critical, or just the debugger?)
  67 (defun context-register (context index)
  68   (declare (type (alien (* os-context-t)) context))
  69   (deref (context-register-addr context index)))
  70
  71 (defun %set-context-register (context index new)
  72 (declare (type (alien (* os-context-t)) context))
  73 (setf (deref (context-register-addr context index))
  74       new))
  75
  76 ;;; This is like CONTEXT-REGISTER, but returns the value of a float
  77 ;;; register. FORMAT is the type of float to return.
  78
  79 ;;; FIXME: Whether COERCE actually knows how to make a float out of a
  80 ;;; long is another question. This stuff still needs testing.
  81 #+nil
  82 (define-alien-routine ("os_context_float_register_addr" context-float-register-addr)
  83   (* long)
  84   (context (* os-context-t))
  85   (index int))
  86 #+nil
  87 (defun context-float-register (context index format)
  88   (declare (type (alien (* os-context-t)) context))
  89   (coerce (deref (context-float-register-addr context index)) format))
  90 #+nil
  91 (defun %set-context-float-register (context index format new)
  92   (declare (type (alien (* os-context-t)) context))
  93   (setf (deref (context-float-register-addr context index))
  94         (coerce new format)))
  95
  96 ;;; Given a signal context, return the floating point modes word in
  97 ;;; the same format as returned by FLOATING-POINT-MODES.
  98
  99 ;;; Under SunOS, we have a straightforward implementation in C:
 100 #!+sunos
 101 (define-alien-routine ("os_context_fp_control" context-floating-point-modes)
 102     (sb!alien:unsigned 32)
 103   (context (* os-context-t)))
 104
 105 ;;; Under Linux, we have to contend with utterly broken signal handling.
 106 #!+linux
 107 (defun context-floating-point-modes (context)
 108   (warn "stub CONTEXT-FLOATING-POINT-MODES")
 109   0)
 110 \f
 111 ;;;; INTERNAL-ERROR-ARGS.
 112
 113 ;;; Given a (POSIX) signal context, extract the internal error
 114 ;;; arguments from the instruction stream.  This is e.g.
 115 ;;; 4       23      254     240     2       0       0       0
 116 ;;; |       ~~~~~~~~~~~~~~~~~~~~~~~~~
 117 ;;; length         data              (everything is an octet)
 118 ;;;  (pc)
 119 (defun internal-error-args (context)
 120   (declare (type (alien (* os-context-t)) context))
 121   (sb!int::/show0 "entering INTERNAL-ERROR-ARGS")
 122   (let* ((pc (context-pc context))
 123          (bad-inst (sap-ref-32 pc 0))
 124          (op (ldb (byte 2 30) bad-inst))
 125          (op2 (ldb (byte 3 22) bad-inst))
 126          (op3 (ldb (byte 6 19) bad-inst)))
 127     (declare (type system-area-pointer pc))
 128     (cond ((and (= op #b00) (= op2 #b000))
 129            (args-for-unimp-inst context))
 130           ((and (= op #b10) (= (ldb (byte 4 2) op3) #b1000))
 131            (args-for-tagged-add-inst context bad-inst))
 132           ((and (= op #b10) (= op3 #b111010))
 133            (args-for-tcc-inst bad-inst))
 134           (t
 135            (values #.(error-number-or-lose 'unknown-error) nil)))))
 136
 137 (defun args-for-unimp-inst (context)
 138   (declare (type (alien (* os-context-t)) context))
 139   (let* ((pc (context-pc context))
 140          (length (sap-ref-8 pc 4))
 141          (vector (make-array length :element-type '(unsigned-byte 8))))
 142     (declare (type system-area-pointer pc)
 143              (type (unsigned-byte 8) length)
 144              (type (simple-array (unsigned-byte 8) (*)) vector))
 145     (copy-from-system-area pc (* n-byte-bits 5)
 146                            vector (* n-word-bits
 147                                      vector-data-offset)
 148                            (* length n-byte-bits))
 149     (let* ((index 0)
 150            (error-number (sb!c:read-var-integer vector index)))
 151       (collect ((sc-offsets))
 152                (loop
 153                 (when (>= index length)
 154                   (return))
 155                 (sc-offsets (sb!c:read-var-integer vector index)))
 156                (values error-number (sc-offsets))))))
 157
 158 (defun args-for-tagged-add-inst (context bad-inst)
 159   (declare (type (alien (* os-context-t)) context))
 160   (let* ((rs1 (ldb (byte 5 14) bad-inst))
 161          (op1 (sb!kernel:make-lisp-obj (context-register context rs1))))
 162     (if (fixnump op1)
 163         (if (zerop (ldb (byte 1 13) bad-inst))
 164             (let* ((rs2 (ldb (byte 5 0) bad-inst))
 165                    (op2 (sb!kernel:make-lisp-obj (context-register context rs2))))
 166               (if (fixnump op2)
 167                   (values #.(error-number-or-lose 'unknown-error) nil)
 168                   (values #.(error-number-or-lose 'object-not-fixnum-error)
 169                           (list (sb!c::make-sc-offset
 170                                  descriptor-reg-sc-number
 171                                  rs2)))))
 172             (values #.(error-number-or-lose 'unknown-error) nil))
 173         (values #.(error-number-or-lose 'object-not-fixnum-error)
 174                 (list (sb!c::make-sc-offset descriptor-reg-sc-number
 175                                             rs1))))))
 176
 177 (defun args-for-tcc-inst (bad-inst)
 178   (let* ((trap-number (ldb (byte 8 0) bad-inst))
 179          (reg (ldb (byte 5 8) bad-inst)))
 180     (values (case trap-number
 181               (#.object-not-list-trap
 182                #.(error-number-or-lose 'object-not-list-error))
 183               (#.object-not-instance-trap
 184                #.(error-number-or-lose 'object-not-instance-error))
 185               (t
 186                #.(error-number-or-lose 'unknown-error)))
 187             (list (sb!c::make-sc-offset descriptor-reg-sc-number reg)))))
 188