src/assembly/ppc/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 bla (make-fixup ',name :assembly-routine)))
  19       `()))
  20     (:full-call
  21      (let ((temp (make-symbol "TEMP"))
  22            (nfp-save (make-symbol "NFP-SAVE"))
  23            (lra (make-symbol "LRA")))
  24        (values
  25         `((let ((lra-label (gen-label))
  26                 (cur-nfp (current-nfp-tn ,vop)))
  27             (when cur-nfp
  28               (store-stack-tn ,nfp-save cur-nfp))
  29             (inst compute-lra-from-code ,lra code-tn lra-label ,temp)
  30             (note-next-instruction ,vop :call-site)
  31             (inst ba (make-fixup ',name :assembly-routine))
  32             (emit-return-pc lra-label)
  33             (note-this-location ,vop :single-value-return)
  34             (without-scheduling ()
  35                                 (move csp-tn ocfp-tn)
  36                                 (inst nop))
  37             (inst compute-code-from-lra code-tn code-tn
  38                   lra-label ,temp)
  39             (when cur-nfp
  40               (load-stack-tn cur-nfp ,nfp-save))))
  41         `((:temporary (:scs (non-descriptor-reg) :from (:eval 0) :to (:eval 1))
  42            ,temp)
  43           (:temporary (:sc descriptor-reg :offset lra-offset
  44                        :from (:eval 0) :to (:eval 1))
  45            ,lra)
  46           (:temporary (:scs (control-stack) :offset nfp-save-offset)
  47            ,nfp-save)
  48           (:save-p :compute-only)))))))
  49
  50 (!def-vm-support-routine generate-return-sequence (style)
  51   (ecase style
  52     (:raw
  53      `((inst blr)))
  54     (:full-call
  55      `((lisp-return (make-random-tn :kind :normal
  56                                     :sc (sc-or-lose 'descriptor-reg )
  57                                     :offset lra-offset)
  58                     (make-random-tn :kind :normal
  59                                     :sc (sc-or-lose 'interior-reg )
  60                                     :offset lip-offset)
  61                     :offset 2)))
  62     (:none)))
  63
  64 (defun return-machine-address (scp)
  65   (sap-int (context-lr scp)))