1 ;;;; This software is part of the SBCL system. See the README file for
4 ;;;; This software is derived from the CMU CL system, which was
5 ;;;; written at Carnegie Mellon University and released into the
6 ;;;; public domain. The software is in the public domain and is
7 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
8 ;;;; files for more information.
12 ;;;; Machine Architecture parameters:
13 (eval-when (:compile-toplevel :load-toplevel :execute)
15 (def!constant n-word-bits 32
17 "Number of bits per word where a word holds one lisp descriptor.")
19 (def!constant n-byte-bits 8
21 "Number of bits per byte where a byte is the smallest addressable object.")
23 (def!constant word-shift (1- (integer-length (/ n-word-bits n-byte-bits)))
25 "Number of bits to shift between word addresses and byte addresses.")
27 (def!constant n-word-bytes (/ n-word-bits n-byte-bits)
29 "Number of bytes in a word.")
31 (def!constant n-fixnum-tag-bits (1- n-lowtag-bits)
33 "Number of tag bits used for a fixnum")
35 (def!constant fixnum-tag-mask (1- (ash 1 n-fixnum-tag-bits))
37 "Mask to get the fixnum tag")
39 (def!constant n-positive-fixnum-bits (- n-word-bits n-fixnum-tag-bits 1)
41 "Maximum number of bits in a positive fixnum")
43 (def!constant float-sign-shift 31)
45 (def!constant single-float-bias 126)
46 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equalp)
47 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
48 (def!constant single-float-normal-exponent-min 1)
49 (def!constant single-float-normal-exponent-max 254)
50 (def!constant single-float-hidden-bit (ash 1 23))
51 (def!constant single-float-trapping-nan-bit (ash 1 22))
53 (def!constant double-float-bias 1022)
54 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equalp)
55 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equalp)
56 (def!constant double-float-normal-exponent-min 1)
57 (def!constant double-float-normal-exponent-max #x7FE)
58 (def!constant double-float-hidden-bit (ash 1 20))
59 (def!constant double-float-trapping-nan-bit (ash 1 19))
62 ;;; X These values are for the x86 80 bit format and are no doubt
63 ;;; incorrect for the sparc.
65 (def!constant long-float-bias 16382)
66 (defconstant-eqx long-float-exponent-byte (byte 15 0) #'equalp)
67 (defconstant-eqx long-float-significand-byte (byte 31 0) #'equalp)
68 (def!constant long-float-normal-exponent-min 1)
69 (def!constant long-float-normal-exponent-max #x7FFE)
70 (def!constant long-float-hidden-bit (ash 1 31))
71 (def!constant long-float-trapping-nan-bit (ash 1 30))
73 (def!constant single-float-digits
74 (+ (byte-size single-float-significand-byte) 1))
76 (def!constant double-float-digits
77 (+ (byte-size double-float-significand-byte) n-word-bits 1))
79 ;;; This looks wrong - CSR
80 (def!constant long-float-digits
81 (+ (byte-size long-float-significand-byte) n-word-bits 1))
83 (def!constant float-inexact-trap-bit (ash 1 0))
84 (def!constant float-divide-by-zero-trap-bit (ash 1 1))
85 (def!constant float-underflow-trap-bit (ash 1 2))
86 (def!constant float-overflow-trap-bit (ash 1 3))
87 (def!constant float-invalid-trap-bit (ash 1 4))
89 (def!constant float-round-to-nearest 0)
90 (def!constant float-round-to-zero 1)
91 (def!constant float-round-to-positive 2)
92 (def!constant float-round-to-negative 3)
94 (defconstant-eqx float-rounding-mode (byte 2 30) #'equalp) ; RD
95 (defconstant-eqx float-sticky-bits (byte 5 5) #'equalp) ; aexc
96 (defconstant-eqx float-traps-byte (byte 5 23) #'equalp) ; TEM
97 (defconstant-eqx float-exceptions-byte (byte 5 0) #'equalp) ; cexc
99 ;;; According to the SPARC doc (as opposed to FPU doc), the fast mode
100 ;;; bit (EFM) is "reserved", and should always be zero. However, for
101 ;;; sparc-V8 and sparc-V9, it appears to work, causing denormals to
102 ;;; be truncated to 0 silently.
103 (def!constant float-fast-bit (ash 1 22))
107 ;;; NUMBER-STACK-DISPLACEMENT
109 ;;; The number of bytes reserved above the number stack pointer. These
110 ;;; slots are required by architecture for a place to spill register windows.
112 ;;; FIXME: Where is this used?
113 (def!constant number-stack-displacement
117 ;;;; Description of the target address space.
119 ;;; Where to put the different spaces. Must match the C code!
122 (def!constant read-only-space-start #x10000000)
123 (def!constant read-only-space-end #x15000000)
125 (def!constant static-space-start #x28000000)
126 (def!constant static-space-end #x2c000000)
128 ;; From alpha/parms.lisp:
129 ;; this is used in PURIFY as part of a sloppy check to see if a pointer
130 ;; is in dynamic space. Chocolate brownie for the first person to fix it
132 (def!constant dynamic-space-start #x30000000)
133 (def!constant dynamic-space-end #x38000000)
135 (def!constant dynamic-0-space-start #x30000000)
136 (def!constant dynamic-0-space-end #x38000000)
138 (def!constant dynamic-1-space-start #x40000000)
139 (def!constant dynamic-1-space-end #x48000000)
141 (def!constant control-stack-start #x50000000)
142 (def!constant control-stack-end #x51000000)
144 (def!constant binding-stack-start #x60000000)
145 (def!constant binding-stack-end #x61000000))
147 #!+sunos ; might as well start by trying the same numbers
149 (def!constant read-only-space-start #x10000000)
150 (def!constant read-only-space-end #x15000000)
152 (def!constant static-space-start #x28000000)
153 (def!constant static-space-end #x2c000000)
155 (def!constant dynamic-space-start #x30000000)
156 (def!constant dynamic-space-end #x38000000)
158 (def!constant dynamic-0-space-start #x30000000)
159 (def!constant dynamic-0-space-end #x38000000)
161 (def!constant dynamic-1-space-start #x40000000)
162 (def!constant dynamic-1-space-end #x48000000)
164 (def!constant control-stack-start #x50000000)
165 (def!constant control-stack-end #x51000000)
167 (def!constant binding-stack-start #x60000000)
168 (def!constant binding-stack-end #x61000000))
171 ;;;; other random constants.
173 (defenum (:suffix -trap :start 8)
182 (defenum (:prefix object-not- :suffix -trap :start 16)
186 (defenum (:prefix trace-table-)
194 ;;; These symbols are loaded into static space directly after NIL so
195 ;;; that the system can compute their address by adding a constant
198 ;;; The fdefn objects for the static functions are loaded into static
199 ;;; space directly after the static symbols. That way, the raw-addr
200 ;;; can be loaded directly out of them by indirecting relative to NIL.
202 (defparameter *static-symbols*
205 ;; The C startup code must fill these in.
207 sb!impl::*!initial-fdefn-objects*
209 ;; functions that the C code needs to call
211 sb!kernel::internal-error
212 sb!kernel::control-stack-exhausted-error
213 sb!di::handle-breakpoint
214 sb!di::handle-fun-end-breakpoint
217 *read-only-space-free-pointer*
218 *static-space-free-pointer*
219 *initial-dynamic-space-free-pointer*
221 ;; things needed for non-local exit
222 *current-catch-block*
223 *current-unwind-protect-block*
225 ;; interrupt handling
226 *free-interrupt-context-index*
227 sb!unix::*interrupts-enabled*
228 sb!unix::*interrupt-pending*
231 (defparameter *static-funs*
233 two-arg-+ two-arg-- two-arg-* two-arg-/ two-arg-< two-arg-> two-arg-=
234 two-arg-<= two-arg->= two-arg-/= eql %negate
235 two-arg-and two-arg-ior two-arg-xor
236 two-arg-gcd two-arg-lcm
239 ;;;; Assembler parameters:
241 ;;; The number of bits per element in the assemblers code vector.
242 (defparameter *assembly-unit-length* 8)
245 ;;;; Pseudo-atomic trap number
247 ;;; KLUDGE: Linux on the SPARC doesn't seem to conform to any kind of
248 ;;; standards at all. So we use an explicitly undefined trap, because
249 ;;; that currently does the right thing. Expect this to break
250 ;;; eventually (but with luck, at that point we'll be able to revert
251 ;;; to the compliant trap number...
253 ;;; KLUDGE: Maybe this should be called pseudo-atomic-magic-number,
254 ;;; allowing other architectures (which don't necessarily use traps
255 ;;; for pseudo-atomic) to propagate a magic number to C land via
258 (def!constant pseudo-atomic-trap #x10)
260 (def!constant pseudo-atomic-trap #x40)