-;;;
-;;; Converted by William Lott.
-;;;
-
-(in-package "SB!VM")
+;;;; the VM definition arithmetic VOPs for the PPC
+;;;; This software is part of the SBCL system. See the README file for
+;;;; more information.
+;;;;
+;;;; This software is derived from the CMU CL system, which was
+;;;; written at Carnegie Mellon University and released into the
+;;;; public domain. The software is in the public domain and is
+;;;; provided with absolutely no warranty. See the COPYING and CREDITS
+;;;; files for more information.
+(in-package "SB!VM")
\f
;;;; Unary operations.
-;;; routines for call-out to C.
-;;;
-;;; Written by William Lott.
-;;;
+;;;; VOPs and other machine-specific support routines for call-out to C
+
+;;;; This software is part of the SBCL system. See the README file for
+;;;; more information.
+;;;;
+;;;; This software is derived from the CMU CL system, which was
+;;;; written at Carnegie Mellon University and released into the
+;;;; public domain. The software is in the public domain and is
+;;;; provided with absolutely no warranty. See the COPYING and CREDITS
+;;;; files for more information.
+
(in-package "SB!VM")
-;;; Return the number of bytes needed for the current non-descriptor stack
-;;; frame. Non-descriptor stack frames must be multiples of 16 bytes under
-;;; the PPC SVr4 ABI (though the EABI may be less restrictive.) Two words
-;;; are reserved for the stack backlink and saved LR (see SB!VM::NUMBER-STACK-
-;;; DISPLACEMENT.)
-;;;
+;;; Return the number of bytes needed for the current non-descriptor
+;;; stack frame. Non-descriptor stack frames must be multiples of 16
+;;; bytes under the PPC SVr4 ABI (though the EABI may be less
+;;; restrictive). On linux, two words are reserved for the stack
+;;; backlink and saved LR (see SB!VM::NUMBER-STACK-DISPLACEMENT).
(defconstant +stack-alignment-bytes+
;; Duh. PPC Linux (and VxWorks) adhere to the EABI.
(:temporary (:scs (unsigned-reg) :to (:result 0)) temp)
(:generator 0
(unless (zerop amount)
- (let ((delta (- (logandc2 (+ amount 8 +stack-alignment-bytes+)
+ ;; FIXME: I don't understand why we seem to be adding
+ ;; NUMBER-STACK-DISPLACEMENT twice here. Weird. -- CSR,
+ ;; 2003-08-20
+ (let ((delta (- (logandc2 (+ amount number-stack-displacement
+ +stack-alignment-bytes+)
+stack-alignment-bytes+))))
(cond ((>= delta (ash -1 16))
(inst stwu nsp-tn nsp-tn delta))
(:policy :fast-safe)
(:generator 0
(unless (zerop amount)
- (let ((delta (logandc2 (+ amount 8 +stack-alignment-bytes+)
+ (let ((delta (logandc2 (+ amount number-stack-displacement
+ +stack-alignment-bytes+)
+stack-alignment-bytes+)))
(cond ((< delta (ash 1 16))
(inst addi nsp-tn nsp-tn delta))