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      (let ((jump (make-symbol "JUMP")))
  18        (values
  19         `((inst lr ,jump (make-fixup ',name :assembly-routine))
  20           (inst mtlr ,jump)
  21           (inst blrl))
  22         `((:temporary (:sc any-reg) ,jump)))))
  23     (:full-call
  24      (let ((temp (make-symbol "TEMP"))
  25            (jump (make-symbol "JUMP"))
  26            (nfp-save (make-symbol "NFP-SAVE"))
  27            (lra (make-symbol "LRA")))
  28        (values
  29         `((let ((lra-label (gen-label))
  30                 (cur-nfp (current-nfp-tn ,vop)))
  31             (when cur-nfp
  32               (store-stack-tn ,nfp-save cur-nfp))
  33             (inst compute-lra-from-code ,lra code-tn lra-label ,temp)
  34             (note-next-instruction ,vop :call-site)
  35             (inst lr ,jump (make-fixup ',name :assembly-routine))
  36             (inst mtlr ,jump)
  37             (inst blr)
  38             (emit-return-pc lra-label)
  39             (note-this-location ,vop :single-value-return)
  40             (without-scheduling ()
  41               (move csp-tn ocfp-tn)
  42               (inst nop))
  43             (inst compute-code-from-lra code-tn code-tn
  44                   lra-label ,temp)
  45             (when cur-nfp
  46               (load-stack-tn cur-nfp ,nfp-save))))
  47         `((:temporary (:scs (non-descriptor-reg) :from (:eval 0) :to (:eval 1))
  48                       ,temp)
  49           (:temporary (:sc descriptor-reg :offset lra-offset
  50                            :from (:eval 0) :to (:eval 1))
  51                       ,lra)
  52           (:temporary (:scs (control-stack) :offset nfp-save-offset)
  53                       ,nfp-save)
  54           (:temporary (:sc any-reg) ,jump)
  55           (:save-p :compute-only)))))))
  56
  57 (!def-vm-support-routine generate-return-sequence (style)
  58   (ecase style
  59     (:raw
  60      `((inst blr)))
  61     (:full-call
  62      `((lisp-return (make-random-tn :kind :normal
  63                                     :sc (sc-or-lose 'descriptor-reg )
  64                                     :offset lra-offset)
  65                     (make-random-tn :kind :normal
  66                                     :sc (sc-or-lose 'interior-reg )
  67                                     :offset lip-offset)
  68                     :offset 2)))
  69     (:none)))
  70
  71 (defun return-machine-address (scp)
  72   (sap-int (context-lr scp)))