3 ;;; number of bits per word where a word holds one lisp descriptor
4 (def!constant n-word-bits 32)
6 ;;; the natural width of a machine word (as seen in e.g. register width,
8 (def!constant n-machine-word-bits 32)
10 ;;; number of bits per byte where a byte is the smallest addressable
12 (def!constant n-byte-bits 8)
15 (def!constant float-sign-shift 31)
17 (def!constant single-float-bias 126)
18 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equalp)
19 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
20 (def!constant single-float-normal-exponent-min 1)
21 (def!constant single-float-normal-exponent-max 254)
22 (def!constant single-float-hidden-bit (ash 1 23))
23 (def!constant single-float-trapping-nan-bit (ash 1 22))
25 (def!constant double-float-bias 1022)
26 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equalp)
27 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equalp)
28 (def!constant double-float-normal-exponent-min 1)
29 (def!constant double-float-normal-exponent-max #x7FE)
30 (def!constant double-float-hidden-bit (ash 1 20))
31 (def!constant double-float-trapping-nan-bit (ash 1 19))
33 (def!constant single-float-digits
34 (+ (byte-size single-float-significand-byte) 1))
36 (def!constant double-float-digits
37 (+ (byte-size double-float-significand-byte) n-word-bits 1))
39 (def!constant float-inexact-trap-bit (ash 1 0))
40 (def!constant float-underflow-trap-bit (ash 1 1))
41 (def!constant float-overflow-trap-bit (ash 1 2))
42 (def!constant float-divide-by-zero-trap-bit (ash 1 3))
43 (def!constant float-invalid-trap-bit (ash 1 4))
45 (def!constant float-round-to-nearest 0)
46 (def!constant float-round-to-zero 1)
47 (def!constant float-round-to-positive 2)
48 (def!constant float-round-to-negative 3)
50 (defconstant-eqx float-rounding-mode (byte 2 0) #'equalp)
51 (defconstant-eqx float-sticky-bits (byte 5 2) #'equalp)
52 (defconstant-eqx float-traps-byte (byte 5 7) #'equalp)
53 (defconstant-eqx float-exceptions-byte (byte 5 12) #'equalp)
54 (defconstant-eqx float-condition-bit (ash 1 23) #'equalp)
55 (def!constant float-fast-bit 0) ; No fast mode on PMAX.
58 ;;;; Description of the target address space.
60 ;;; Where to put the different spaces.
62 (def!constant read-only-space-start #x01000000)
63 (def!constant read-only-space-end #x05000000)
65 (def!constant static-space-start #x06000000)
66 (def!constant static-space-end #x08000000)
68 (def!constant dynamic-space-start #x08000000)
69 (def!constant dynamic-space-end #x0c000000)
71 (def!constant dynamic-0-space-start #x08000000)
72 (def!constant dynamic-0-space-end #x0c000000)
73 (def!constant dynamic-1-space-start #x0c000000)
74 (def!constant dynamic-1-space-end #x10000000)
77 ;;;; Other non-type constants.
79 (defenum (:suffix -flag)
83 (defenum (:suffix -trap :start 8)
92 (defenum (:prefix trace-table-)
100 ;;; Static symbols are loaded into static space directly after NIL so
101 ;;; that the system can compute their address by adding a constant
104 ;;; The fdefn objects for the static functions are loaded into static
105 ;;; space directly after the static symbols. That way, the raw-addr
106 ;;; can be loaded directly out of them by indirecting relative to NIL.
108 (defparameter *static-symbols*
114 sb!kernel::internal-error
115 sb!kernel::control-stack-exhausted-error
116 sb!di::handle-breakpoint
117 sb!impl::fdefinition-object
120 *read-only-space-free-pointer*
121 *static-space-free-pointer*
122 *initial-dynamic-space-free-pointer*
124 ;; Things needed for non-local-exit.
125 *current-catch-block*
126 *current-unwind-protect-block*
128 *binding-stack-start*
129 *control-stack-start*
132 ;; Interrupt Handling
133 *free-interrupt-context-index*
134 sb!unix::*interrupts-enabled*
135 sb!unix::*interrupt-pending*
138 (defparameter *static-funs*
139 '(sb!kernel:two-arg-+
151 sb!kernel:two-arg-and
152 sb!kernel:two-arg-ior
153 sb!kernel:two-arg-xor
155 sb!kernel:two-arg-gcd
156 sb!kernel:two-arg-lcm))