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 ;;; the natural width of a machine word (as seen in e.g. register width,
21 (def!constant n-machine-word-bits 32)
23 (def!constant n-byte-bits 8
25 "Number of bits per byte where a byte is the smallest addressable object.")
27 (def!constant word-shift (1- (integer-length (/ n-word-bits n-byte-bits)))
29 "Number of bits to shift between word addresses and byte addresses.")
31 (def!constant n-word-bytes (/ n-word-bits n-byte-bits)
33 "Number of bytes in a word.")
35 (def!constant n-fixnum-tag-bits (1- n-lowtag-bits)
37 "Number of tag bits used for a fixnum")
39 (def!constant fixnum-tag-mask (1- (ash 1 n-fixnum-tag-bits))
41 "Mask to get the fixnum tag")
43 (def!constant n-positive-fixnum-bits (- n-word-bits n-fixnum-tag-bits 1)
45 "Maximum number of bits in a positive fixnum")
47 (def!constant float-sign-shift 31)
49 (def!constant single-float-bias 126)
50 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equalp)
51 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
52 (def!constant single-float-normal-exponent-min 1)
53 (def!constant single-float-normal-exponent-max 254)
54 (def!constant single-float-hidden-bit (ash 1 23))
55 (def!constant single-float-trapping-nan-bit (ash 1 22))
57 (def!constant double-float-bias 1022)
58 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equalp)
59 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equalp)
60 (def!constant double-float-normal-exponent-min 1)
61 (def!constant double-float-normal-exponent-max #x7FE)
62 (def!constant double-float-hidden-bit (ash 1 20))
63 (def!constant double-float-trapping-nan-bit (ash 1 19))
66 ;;; X These values are for the x86 80 bit format and are no doubt
67 ;;; incorrect for the sparc.
69 (def!constant long-float-bias 16382)
70 (defconstant-eqx long-float-exponent-byte (byte 15 0) #'equalp)
71 (defconstant-eqx long-float-significand-byte (byte 31 0) #'equalp)
72 (def!constant long-float-normal-exponent-min 1)
73 (def!constant long-float-normal-exponent-max #x7FFE)
74 (def!constant long-float-hidden-bit (ash 1 31))
75 (def!constant long-float-trapping-nan-bit (ash 1 30))
77 (def!constant single-float-digits
78 (+ (byte-size single-float-significand-byte) 1))
80 (def!constant double-float-digits
81 (+ (byte-size double-float-significand-byte) n-word-bits 1))
83 ;;; This looks wrong - CSR
84 (def!constant long-float-digits
85 (+ (byte-size long-float-significand-byte) n-word-bits 1))
87 (def!constant float-inexact-trap-bit (ash 1 0))
88 (def!constant float-divide-by-zero-trap-bit (ash 1 1))
89 (def!constant float-underflow-trap-bit (ash 1 2))
90 (def!constant float-overflow-trap-bit (ash 1 3))
91 (def!constant float-invalid-trap-bit (ash 1 4))
93 (def!constant float-round-to-nearest 0)
94 (def!constant float-round-to-zero 1)
95 (def!constant float-round-to-positive 2)
96 (def!constant float-round-to-negative 3)
98 (defconstant-eqx float-rounding-mode (byte 2 30) #'equalp) ; RD
99 (defconstant-eqx float-sticky-bits (byte 5 5) #'equalp) ; aexc
100 (defconstant-eqx float-traps-byte (byte 5 23) #'equalp) ; TEM
101 (defconstant-eqx float-exceptions-byte (byte 5 0) #'equalp) ; cexc
103 ;;; According to the SPARC doc (as opposed to FPU doc), the fast mode
104 ;;; bit (EFM) is "reserved", and should always be zero. However, for
105 ;;; sparc-V8 and sparc-V9, it appears to work, causing denormals to
106 ;;; be truncated to 0 silently.
107 (def!constant float-fast-bit (ash 1 22))
111 ;;; NUMBER-STACK-DISPLACEMENT
113 ;;; The number of bytes reserved above the number stack pointer. These
114 ;;; slots are required by architecture for a place to spill register windows.
116 ;;; FIXME: Where is this used?
117 (def!constant number-stack-displacement
121 ;;;; Description of the target address space.
123 ;;; Where to put the different spaces. Must match the C code!
126 (def!constant read-only-space-start #x10000000)
127 (def!constant read-only-space-end #x15000000)
129 (def!constant static-space-start #x28000000)
130 (def!constant static-space-end #x2c000000)
132 ;; From alpha/parms.lisp:
133 ;; this is used in PURIFY as part of a sloppy check to see if a pointer
134 ;; is in dynamic space. Chocolate brownie for the first person to fix it
136 (def!constant dynamic-space-start #x30000000)
137 (def!constant dynamic-space-end #x38000000)
139 (def!constant dynamic-0-space-start #x30000000)
140 (def!constant dynamic-0-space-end #x38000000)
142 (def!constant dynamic-1-space-start #x40000000)
143 (def!constant dynamic-1-space-end #x48000000))
145 #!+sunos ; might as well start by trying the same numbers
147 (def!constant read-only-space-start #x10000000)
148 (def!constant read-only-space-end #x15000000)
150 (def!constant static-space-start #x28000000)
151 (def!constant static-space-end #x2c000000)
153 (def!constant dynamic-space-start #x30000000)
154 (def!constant dynamic-space-end #x38000000)
156 (def!constant dynamic-0-space-start #x30000000)
157 (def!constant dynamic-0-space-end #x38000000)
159 (def!constant dynamic-1-space-start #x40000000)
160 (def!constant dynamic-1-space-end #x48000000))
163 ;;;; other random constants.
165 (defenum (:suffix -trap :start 8)
174 (defenum (:prefix object-not- :suffix -trap :start 16)
178 (defenum (:prefix trace-table-)
186 ;;; These symbols are loaded into static space directly after NIL so
187 ;;; that the system can compute their address by adding a constant
190 ;;; The fdefn objects for the static functions are loaded into static
191 ;;; space directly after the static symbols. That way, the raw-addr
192 ;;; can be loaded directly out of them by indirecting relative to NIL.
194 (defparameter *static-symbols*
197 ;; The C startup code must fill these in.
199 sb!impl::*!initial-fdefn-objects*
201 ;; functions that the C code needs to call
203 sb!kernel::internal-error
204 sb!kernel::control-stack-exhausted-error
205 sb!di::handle-breakpoint
206 sb!di::handle-fun-end-breakpoint
209 *read-only-space-free-pointer*
210 *static-space-free-pointer*
211 *initial-dynamic-space-free-pointer*
213 ;; things needed for non-local exit
214 *current-catch-block*
215 *current-unwind-protect-block*
217 *binding-stack-start*
218 *control-stack-start*
221 ;; interrupt handling
222 *free-interrupt-context-index*
223 sb!unix::*interrupts-enabled*
224 sb!unix::*interrupt-pending*
227 (defparameter *static-funs*
229 two-arg-+ two-arg-- two-arg-* two-arg-/ two-arg-< two-arg-> two-arg-=
230 two-arg-<= two-arg->= two-arg-/= eql %negate
231 two-arg-and two-arg-ior two-arg-xor two-arg-eqv
232 two-arg-gcd two-arg-lcm
235 ;;;; Assembler parameters:
237 ;;; The number of bits per element in the assemblers code vector.
238 (defparameter *assembly-unit-length* 8)
241 ;;;; Pseudo-atomic trap number
243 ;;; KLUDGE: Linux on the SPARC doesn't seem to conform to any kind of
244 ;;; standards at all. So we use an explicitly undefined trap, because
245 ;;; that currently does the right thing. Expect this to break
246 ;;; eventually (but with luck, at that point we'll be able to revert
247 ;;; to the compliant trap number...
249 ;;; KLUDGE: Maybe this should be called pseudo-atomic-magic-number,
250 ;;; allowing other architectures (which don't necessarily use traps
251 ;;; for pseudo-atomic) to propagate a magic number to C land via
254 (def!constant pseudo-atomic-trap #x10)
256 (def!constant pseudo-atomic-trap #x40)