src/assembly/alpha/support.lisp

   1 ;;;; the machine-specific support routines needed by the file assembler
   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
  12 (in-package "SB!VM")
  13
  14 (!def-vm-support-routine generate-call-sequence (name style vop)
  15   (ecase style
  16     ((:raw :none)
  17      (values
  18       `((inst li (make-fixup ',name :assembly-routine) temp)
  19         (inst jsr lip-tn temp))
  20       '((:temporary (:sc non-descriptor-reg) temp))
  21      nil))
  22     (:full-call
  23      (let ((temp (make-symbol "TEMP"))
  24            (nfp-save (make-symbol "NFP-SAVE"))
  25            (lra (make-symbol "LRA")))
  26        (values
  27         `((let ((lra-label (gen-label))
  28                 (cur-nfp (current-nfp-tn ,vop)))
  29             (when cur-nfp
  30               (store-stack-tn ,nfp-save cur-nfp))
  31             (inst compute-lra-from-code ,lra code-tn lra-label ,temp)
  32             (note-next-instruction ,vop :call-site)
  33             ; here
  34             (inst li (make-fixup ',name :assembly-routine) temp1)
  35             (inst jsr lip-tn temp1 (make-fixup ',name :assembly-routine))
  36             (emit-return-pc lra-label)
  37             (note-this-location ,vop :single-value-return)
  38             (without-scheduling ()
  39               (move ocfp-tn csp-tn)
  40               (inst nop))
  41             (inst compute-code-from-lra code-tn code-tn
  42                   lra-label ,temp)
  43             (when cur-nfp
  44               (maybe-load-stack-nfp-tn cur-nfp ,nfp-save temp1))))
  45         `((:temporary (:scs (non-descriptor-reg) :from (:eval 0) :to (:eval 1))
  46                       ,temp)
  47           (:temporary (:sc descriptor-reg :offset lra-offset
  48                        :from (:eval 0) :to (:eval 1))
  49                       ,lra)
  50           (:temporary (:scs (control-stack) :offset nfp-save-offset)
  51                       ,nfp-save)
  52           (:temporary (:scs (non-descriptor-reg)) temp1)
  53           (:save-p t)))))))
  54
  55 (!def-vm-support-routine generate-return-sequence (style)
  56   (ecase style
  57     (:raw
  58      `((inst ret zero-tn lip-tn)))
  59     (:full-call
  60      `((lisp-return (make-random-tn :kind :normal
  61                                     :sc (sc-or-lose
  62                                          'descriptor-reg)
  63                                     :offset lra-offset)
  64                     lip-tn :offset 2)))
  65     (:none)))
  66
  67 (defun return-machine-address (scp)
  68   (context-register scp lip-offset))