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.
62 ;; Where to put the different spaces.
63 ;; Old definitions, might be still relevant for an IRIX port.
65 (def!constant read-only-space-start #x01000000)
66 (def!constant read-only-space-end #x05000000)
68 (def!constant static-space-start #x06000000)
69 (def!constant static-space-end #x08000000)
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))
78 ;; Where to put the address spaces on Linux.
80 ;; C runtime executable segment starts at 0x00400000
81 (def!constant read-only-space-start #x01000000)
82 (def!constant read-only-space-end #x08000000)
84 (def!constant static-space-start #x08000000)
85 (def!constant static-space-end #x10000000)
86 ;; C runtime read/write segment starts at 0x10000000, heap and DSOs
87 ;; start at 0x2a000000
88 (def!constant dynamic-0-space-start #x30000000)
89 (def!constant dynamic-0-space-end #x50000000)
90 (def!constant dynamic-1-space-start #x50000000)
91 (def!constant dynamic-1-space-end #x70000000)
92 ;; C stack grows downward from 0x80000000
97 ;;;; Other non-type constants.
99 (defenum (:suffix -flag)
103 (defenum (:suffix -trap :start 8)
116 (defenum (:prefix trace-table-)
124 ;;; Static symbols are loaded into static space directly after NIL so
125 ;;; that the system can compute their address by adding a constant
128 ;;; The fdefn objects for the static functions are loaded into static
129 ;;; space directly after the static symbols. That way, the raw-addr
130 ;;; can be loaded directly out of them by indirecting relative to NIL.
132 (defparameter *static-symbols*
138 sb!kernel::internal-error
139 sb!kernel::control-stack-exhausted-error
140 sb!kernel::undefined-alien-variable-error
141 sb!kernel::undefined-alien-function-error
142 sb!di::handle-breakpoint
143 sb!impl::fdefinition-object
146 *read-only-space-free-pointer*
147 *static-space-free-pointer*
148 *initial-dynamic-space-free-pointer*
150 ;; Things needed for non-local-exit.
151 *current-catch-block*
152 *current-unwind-protect-block*
154 *binding-stack-start*
155 *control-stack-start*
158 ;; Interrupt Handling
159 *free-interrupt-context-index*
160 sb!unix::*interrupts-enabled*
161 sb!unix::*interrupt-pending*
165 (defparameter *static-funs*
166 '(sb!kernel:two-arg-+
178 sb!kernel:two-arg-and
179 sb!kernel:two-arg-ior
180 sb!kernel:two-arg-xor
182 sb!kernel:two-arg-gcd
183 sb!kernel:two-arg-lcm))