src/code/arm64-vm.lisp

   1 ;;; This file contains the ARM specific runtime stuff.
   2 ;;;
   3 (in-package "SB!VM")
   4
   5 ;;; See x86-vm.lisp for a description of this.
   6 ;;; FIXME: Why is this present in every ARCH-vm.lisp with the the same definition. Is there something like common-vm?
   7 (define-alien-type os-context-t (struct os-context-t-struct))
   8 \f
   9 (defun machine-type ()
  10   #!+sb-doc
  11   "Return a string describing the type of the local machine."
  12   "ARM64")
  13 \f
  14 ;;;; FIXUP-CODE-OBJECT
  15
  16 (defun fixup-code-object (code offset fixup kind)
  17   (declare (type index offset))
  18   (unless (zerop (rem offset 4))
  19     (error "Unaligned instruction?  offset=#x~X." offset))
  20   (without-gcing
  21     (let ((sap (%primitive code-instructions code)))
  22       (ecase kind
  23         (:absolute
  24          (setf (sap-ref-word sap offset) fixup))
  25         (:cond-branch
  26          (setf (ldb (byte 19 5) (sap-ref-32 sap offset))
  27                (ash (- fixup (+ (sap-int sap) offset)) -2)))
  28         (:uncond-branch
  29          (setf (ldb (byte 26 0) (sap-ref-32 sap offset))
  30                (ash (- fixup (+ (sap-int sap) offset)) -2)))))))
  31 \f
  32 ;;;; "Sigcontext" access functions, cut & pasted from sparc-vm.lisp,
  33 ;;;; then modified for ARM.
  34 ;;;;
  35 ;;;; See also x86-vm for commentary on signed vs unsigned.
  36
  37 (define-alien-routine ("os_context_register_addr" context-register-addr)
  38   (* unsigned-long)
  39   (context (* os-context-t))
  40   (index int))
  41
  42 (define-alien-routine ("os_context_pc_addr" context-register-pc-addr)
  43   (* unsigned-long)
  44   (context (* os-context-t)))
  45 (define-alien-routine ("os_context_float_register_addr" context-float-register-addr)
  46   (* unsigned) (context (* os-context-t)) (index int))
  47
  48 ;;; FIXME: Should this and CONTEXT-PC be INLINE to reduce consing?
  49 ;;; (Are they used in anything time-critical, or just the debugger?)
  50 (defun context-register (context index)
  51   (declare (type (alien (* os-context-t)) context))
  52   (deref (context-register-addr context index)))
  53
  54 (defun %set-context-register (context index new)
  55   (declare (type (alien (* os-context-t)) context))
  56   (setf (deref (context-register-addr context index))
  57         new))
  58
  59 (defun context-float-register (context index format)
  60   (let ((sap (alien-sap (context-float-register-addr context index))))
  61     (ecase format
  62       (single-float
  63        (sap-ref-single sap 0))
  64       (double-float
  65        (sap-ref-double sap 0))
  66       (complex-single-float
  67        (complex (sap-ref-single sap 0)
  68                 (sap-ref-single sap 4)))
  69       (complex-double-float
  70        (complex (sap-ref-double sap 0)
  71                 (sap-ref-double sap 8))))))
  72
  73 (defun %set-context-float-register (context index format value)
  74   (let ((sap (alien-sap (context-float-register-addr context index))))
  75     (ecase format
  76       (single-float
  77        (setf (sap-ref-single sap 0) value))
  78       (double-float
  79        (setf (sap-ref-double sap 0) value))
  80       (complex-single-float
  81        (locally
  82            (declare (type (complex single-float) value))
  83          (setf (sap-ref-single sap 0) (realpart value)
  84                (sap-ref-single sap 4) (imagpart value))))
  85       (complex-double-float
  86        (locally
  87            (declare (type (complex double-float) value))
  88          (setf (sap-ref-double sap 0) (realpart value)
  89                (sap-ref-double sap 8) (imagpart value)))))))
  90
  91 (defun context-pc (context)
  92   (declare (type (alien (* os-context-t)) context))
  93   (int-sap (deref (context-register-pc-addr context))))
  94 \f
  95 ;;;; INTERNAL-ERROR-ARGS.
  96
  97 ;;; Given a (POSIX) signal context, extract the internal error
  98 ;;; arguments from the instruction stream.
  99 (defun internal-error-args (context)
 100   (declare (type (alien (* os-context-t)) context))
 101   (let* ((pc (context-pc context))
 102          (instruction (sap-ref-32 pc 0))
 103          (error-number (ldb (byte 8 13) instruction)))
 104     (declare (type system-area-pointer pc))
 105     (if (= (ldb (byte 8 5) instruction) invalid-arg-count-trap)
 106         (values error-number '(#.arg-count-sc))
 107         (let* ((length (sap-ref-8 pc 4))
 108                (vector (make-array length :element-type '(unsigned-byte 8)))
 109                (index 0))
 110           (declare (type (unsigned-byte 8) length)
 111                    (type (simple-array (unsigned-byte 8) (*)) vector))
 112           (copy-ub8-from-system-area pc 5 vector 0 length)
 113           (collect ((sc-offsets))
 114             (loop
 115              (when (>= index length)
 116                (return))
 117              (sc-offsets (sb!c:read-var-integer vector index)))
 118             (values error-number (sc-offsets)))))))