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 ;;; number of bits per word where a word holds one lisp descriptor
16 (def!constant n-word-bits 32)
18 ;;; the natural width of a machine word (as seen in e.g. register width,
20 (def!constant n-machine-word-bits 32)
22 ;;; number of bits per byte where a byte is the smallest addressable object
23 (def!constant n-byte-bits 8)
25 (def!constant float-sign-shift 31)
27 (def!constant single-float-bias 126)
28 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equalp)
29 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
30 (def!constant single-float-normal-exponent-min 1)
31 (def!constant single-float-normal-exponent-max 254)
32 (def!constant single-float-hidden-bit (ash 1 23))
33 (def!constant single-float-trapping-nan-bit (ash 1 22))
35 (def!constant double-float-bias 1022)
36 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equalp)
37 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equalp)
38 (def!constant double-float-normal-exponent-min 1)
39 (def!constant double-float-normal-exponent-max #x7FE)
40 (def!constant double-float-hidden-bit (ash 1 20))
41 (def!constant double-float-trapping-nan-bit (ash 1 19))
44 ;;; X These values are for the x86 80 bit format and are no doubt
45 ;;; incorrect for the sparc.
47 (def!constant long-float-bias 16382)
48 (defconstant-eqx long-float-exponent-byte (byte 15 0) #'equalp)
49 (defconstant-eqx long-float-significand-byte (byte 31 0) #'equalp)
50 (def!constant long-float-normal-exponent-min 1)
51 (def!constant long-float-normal-exponent-max #x7FFE)
52 (def!constant long-float-hidden-bit (ash 1 31))
53 (def!constant long-float-trapping-nan-bit (ash 1 30))
55 (def!constant single-float-digits
56 (+ (byte-size single-float-significand-byte) 1))
58 (def!constant double-float-digits
59 (+ (byte-size double-float-significand-byte) n-word-bits 1))
61 ;;; This looks wrong - CSR
62 (def!constant long-float-digits
63 (+ (byte-size long-float-significand-byte) n-word-bits 1))
65 (def!constant float-inexact-trap-bit (ash 1 0))
66 (def!constant float-divide-by-zero-trap-bit (ash 1 1))
67 (def!constant float-underflow-trap-bit (ash 1 2))
68 (def!constant float-overflow-trap-bit (ash 1 3))
69 (def!constant float-invalid-trap-bit (ash 1 4))
71 (def!constant float-round-to-nearest 0)
72 (def!constant float-round-to-zero 1)
73 (def!constant float-round-to-positive 2)
74 (def!constant float-round-to-negative 3)
76 (defconstant-eqx float-rounding-mode (byte 2 30) #'equalp) ; RD
77 (defconstant-eqx float-sticky-bits (byte 5 5) #'equalp) ; aexc
78 (defconstant-eqx float-traps-byte (byte 5 23) #'equalp) ; TEM
79 (defconstant-eqx float-exceptions-byte (byte 5 0) #'equalp) ; cexc
81 ;;; According to the SPARC doc (as opposed to FPU doc), the fast mode
82 ;;; bit (EFM) is "reserved", and should always be zero. However, for
83 ;;; sparc-V8 and sparc-V9, it appears to work, causing denormals to
84 ;;; be truncated to 0 silently.
85 (def!constant float-fast-bit (ash 1 22))
90 ;;;; Description of the target address space.
92 ;;; Where to put the different spaces. Must match the C code!
95 (def!constant linkage-table-space-start #x0f800000)
96 (def!constant linkage-table-space-end #x10000000)
98 (def!constant read-only-space-start #x10000000)
99 (def!constant read-only-space-end #x15000000)
101 (def!constant static-space-start #x28000000)
102 (def!constant static-space-end #x2c000000)
104 (def!constant dynamic-0-space-start #x30000000)
105 (def!constant dynamic-0-space-end #x38000000)
107 (def!constant dynamic-1-space-start #x40000000)
108 (def!constant dynamic-1-space-end #x48000000))
110 #!+sunos ; might as well start by trying the same numbers
112 (def!constant linkage-table-space-start #x0f800000)
113 (def!constant linkage-table-space-end #x10000000)
115 (def!constant read-only-space-start #x10000000)
116 (def!constant read-only-space-end #x15000000)
118 (def!constant static-space-start #x28000000)
119 (def!constant static-space-end #x2c000000)
121 (def!constant dynamic-0-space-start #x30000000)
122 (def!constant dynamic-0-space-end #x38000000)
124 (def!constant dynamic-1-space-start #x40000000)
125 (def!constant dynamic-1-space-end #x48000000))
127 #!+netbsd ; Need a gap at 0x4000000 for shared libraries
129 (def!constant linkage-table-space-start #x0f800000)
130 (def!constant linkage-table-space-end #x10000000)
132 (def!constant read-only-space-start #x10000000)
133 (def!constant read-only-space-end #x15000000)
135 (def!constant static-space-start #x18000000)
136 (def!constant static-space-end #x1c000000)
138 (def!constant dynamic-0-space-start #x20000000)
139 (def!constant dynamic-0-space-end #x38000000)
141 (def!constant dynamic-1-space-start #x48000000)
142 (def!constant dynamic-1-space-end #x60000000))
144 ;; Size of one linkage-table entry in bytes. See comment in
145 ;; src/runtime/sparc-arch.c
146 (def!constant linkage-table-entry-size 16)
149 ;;;; other random constants.
151 (defenum (:suffix -trap :start 8)
162 (defenum (:prefix object-not- :suffix -trap :start 24)
166 (defenum (:prefix trace-table-)
174 ;;; These symbols are loaded into static space directly after NIL so
175 ;;; that the system can compute their address by adding a constant
178 ;;; The fdefn objects for the static functions are loaded into static
179 ;;; space directly after the static symbols. That way, the raw-addr
180 ;;; can be loaded directly out of them by indirecting relative to NIL.
182 (defparameter *static-symbols*
184 *common-static-symbols*
185 *c-callable-static-symbols*
188 (defparameter *static-funs*
190 two-arg-+ two-arg-- two-arg-* two-arg-/ two-arg-< two-arg-> two-arg-=
191 two-arg-<= two-arg->= two-arg-/= eql %negate
192 two-arg-and two-arg-ior two-arg-xor two-arg-eqv
193 two-arg-gcd two-arg-lcm
196 ;;;; Assembler parameters:
198 ;;; The number of bits per element in the assemblers code vector.
199 (defparameter *assembly-unit-length* 8)
202 ;;;; Pseudo-atomic trap number
204 ;;; KLUDGE: Linux on the SPARC doesn't seem to conform to any kind of
205 ;;; standards at all. So we use an explicitly undefined trap, because
206 ;;; that currently does the right thing. Expect this to break
207 ;;; eventually (but with luck, at that point we'll be able to revert
208 ;;; to the compliant trap number...
210 ;;; KLUDGE: Maybe this should be called pseudo-atomic-magic-number,
211 ;;; allowing other architectures (which don't necessarily use traps
212 ;;; for pseudo-atomic) to propagate a magic number to C land via
215 (def!constant pseudo-atomic-trap #x10)
217 (def!constant pseudo-atomic-trap #x40)