1 ;;;; This file contains some parameterizations of various VM
2 ;;;; attributes for the PPC. This file is separate from other stuff so
3 ;;;; that it can be compiled and loaded earlier.
5 ;;;; This software is part of the SBCL system. See the README file for
8 ;;;; This software is derived from the CMU CL system, which was
9 ;;;; written at Carnegie Mellon University and released into the
10 ;;;; public domain. The software is in the public domain and is
11 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
12 ;;;; files for more information.
16 ;;; number of bits per word where a word holds one lisp descriptor
17 (def!constant n-word-bits 32)
19 ;;; the natural width of a machine word (as seen in e.g. register width,
21 (def!constant n-machine-word-bits 32)
23 ;;; number of bits per byte where a byte is the smallest addressable
25 (def!constant n-byte-bits 8)
28 (def!constant float-sign-shift 31)
30 (def!constant single-float-bias 126)
31 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equalp)
32 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
33 (def!constant single-float-normal-exponent-min 1)
34 (def!constant single-float-normal-exponent-max 254)
35 (def!constant single-float-hidden-bit (ash 1 23))
36 (def!constant single-float-trapping-nan-bit (ash 1 22))
38 (def!constant double-float-bias 1022)
39 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equalp)
40 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equalp)
41 (def!constant double-float-normal-exponent-min 1)
42 (def!constant double-float-normal-exponent-max #x7FE)
43 (def!constant double-float-hidden-bit (ash 1 20))
44 (def!constant double-float-trapping-nan-bit (ash 1 19))
46 (def!constant single-float-digits
47 (+ (byte-size single-float-significand-byte) 1))
49 (def!constant double-float-digits
50 (+ (byte-size double-float-significand-byte) n-word-bits 1))
53 (def!constant float-inexact-trap-bit (ash 1 0))
54 (def!constant float-divide-by-zero-trap-bit (ash 1 1))
55 (def!constant float-underflow-trap-bit (ash 1 2))
56 (def!constant float-overflow-trap-bit (ash 1 3))
57 (def!constant float-invalid-trap-bit (ash 1 4))
59 (def!constant float-round-to-nearest 0)
60 (def!constant float-round-to-zero 1)
61 (def!constant float-round-to-positive 2)
62 (def!constant float-round-to-negative 3)
64 (defconstant-eqx float-rounding-mode (byte 2 0) #'equalp) ; RD
65 ;;; FIXME I: Beware, all ye who trespass here. Despite its name,
66 ;;; FLOAT-STICKY-BITS is not the byte specifier for sticky bits in the
67 ;;; floating point control word. It is more like "accrued exceptions"
68 ;;; where FLOAT-EXCEPTIONS-BYTE is "current exceptions". Consequently,
69 ;;; on architectures where there is no "current exceptions"
70 ;;; FLOAT-EXCEPTIONS-BYTE and FLOAT-STICKY-BITS had better be the
73 ;;; FIXME II: So, I've now documented this in comments in the PowerPC
74 ;;; tree. This may not make it easy to find for when new architectures
75 ;;; get backends written...
78 (defconstant-eqx float-sticky-bits (byte 5 25) #'equalp)
79 (defconstant-eqx float-traps-byte (byte 5 3) #'equalp)
80 (defconstant-eqx float-exceptions-byte (byte 5 25) #'equalp) ; cexc
82 (def!constant float-fast-bit 2) ; Non-IEEE mode
85 ;;; Where to put the different spaces.
87 (def!constant read-only-space-start #x01000000)
88 (def!constant read-only-space-end #x04ff8000)
90 (def!constant static-space-start #x08000000)
91 (def!constant static-space-end #x097fff00)
93 ;;; FIXME: this is a gross violation of OAOO, done purely to support
94 ;;; the #define of DYNAMIC_SPACE_SIZE in validate.c -- CSR, 2002-02-25
95 ;;; (these numbers should match dynamic-0-*)
96 (def!constant dynamic-space-start #x40000000)
97 (def!constant dynamic-space-end #x47fff000)
99 ;;; nothing _seems_ to be using these addresses
100 (def!constant dynamic-0-space-start #x40000000)
101 (def!constant dynamic-0-space-end #x47fff000)
102 (def!constant dynamic-1-space-start #x48000000)
103 (def!constant dynamic-1-space-end #x4ffff000)
107 (def!constant linkage-table-space-start #x50000000)
108 (def!constant linkage-table-space-end #x51000000)
109 (def!constant linkage-table-entry-size 16))
111 ;;;; Other miscellaneous constants.
113 (defenum (:suffix -trap :start 8)
121 fixnum-additive-overflow)
123 (defenum (:prefix object-not- :suffix -trap :start 16)
127 (defenum (:prefix trace-table-)
137 ;;; These symbols are loaded into static space directly after NIL so
138 ;;; that the system can compute their address by adding a constant
141 ;;; The fdefn objects for the static functions are loaded into static
142 ;;; space directly after the static symbols. That way, the raw-addr
143 ;;; can be loaded directly out of them by indirecting relative to NIL.
145 (defparameter *static-symbols*
148 ;; The C startup code must fill these in.
151 ;; functions that the C code needs to call
153 sb!kernel::internal-error
154 sb!kernel::control-stack-exhausted-error
155 sb!kernel::undefined-alien-variable-error
156 sb!kernel::undefined-alien-function-error
157 sb!di::handle-breakpoint
158 sb!impl::fdefinition-object
161 *read-only-space-free-pointer*
162 *static-space-free-pointer*
163 *initial-dynamic-space-free-pointer*
165 ;; things needed for non-local exit
166 *current-catch-block*
167 *current-unwind-protect-block*
169 *binding-stack-start*
170 *control-stack-start*
173 ;; interrupt handling
174 *free-interrupt-context-index*
175 sb!unix::*interrupts-enabled*
176 sb!unix::*interrupt-pending*
181 (defparameter *static-funs*
195 sb!kernel:two-arg-and
196 sb!kernel:two-arg-ior
197 sb!kernel:two-arg-xor
198 sb!kernel:two-arg-eqv
199 sb!kernel:two-arg-gcd
200 sb!kernel:two-arg-lcm))
203 ;;;; Assembler parameters:
205 ;;; The number of bits per element in the assemblers code vector.
207 (defparameter *assembly-unit-length* 8)