4 ;;;; Machine Architecture parameters:
6 ;;; number of bits per word where a word holds one lisp descriptor
7 (def!constant n-word-bits 32)
9 ;;; the natural width of a machine word (as seen in e.g. register width,
11 (def!constant n-machine-word-bits 32)
13 ;;; number of bits per byte where a byte is the smallest addressable
15 (def!constant n-byte-bits 8)
17 (def!constant float-sign-shift 31)
19 (def!constant single-float-bias 126)
20 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equal)
21 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equal)
22 (def!constant single-float-normal-exponent-min 1)
23 (def!constant single-float-normal-exponent-max 254)
24 (def!constant single-float-hidden-bit (ash 1 23))
25 (def!constant single-float-trapping-nan-bit (ash 1 22))
27 (def!constant double-float-bias 1022)
28 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equal)
29 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equal)
30 (def!constant double-float-normal-exponent-min 1)
31 (def!constant double-float-normal-exponent-max #x7FE)
32 (def!constant double-float-hidden-bit (ash 1 20))
33 (def!constant double-float-trapping-nan-bit (ash 1 19))
35 (def!constant single-float-digits
36 (+ (byte-size single-float-significand-byte) 1))
38 (def!constant double-float-digits
39 (+ (byte-size double-float-significand-byte) n-word-bits 1))
41 (def!constant float-inexact-trap-bit (ash 1 0))
42 (def!constant float-underflow-trap-bit (ash 1 1))
43 (def!constant float-overflow-trap-bit (ash 1 2))
44 (def!constant float-divide-by-zero-trap-bit (ash 1 3))
45 (def!constant float-invalid-trap-bit (ash 1 4))
47 (def!constant float-round-to-nearest 0)
48 (def!constant float-round-to-zero 1)
49 (def!constant float-round-to-positive 2)
50 (def!constant float-round-to-negative 3)
52 (defconstant-eqx float-rounding-mode (byte 2 7) #'equal)
53 (defconstant-eqx float-sticky-bits (byte 5 27) #'equal)
54 (defconstant-eqx float-traps-byte (byte 5 0) #'equal)
55 (defconstant-eqx float-exceptions-byte (byte 5 27) #'equal)
56 (def!constant float-condition-bit (ash 1 26))
57 (def!constant float-fast-bit 0) ; No fast mode on HPPA.
61 ;;;; Description of the target address space.
63 ;;; Where to put the different spaces.
65 (def!constant read-only-space-start #x20000000)
66 (def!constant read-only-space-end #x24000000)
68 (def!constant static-space-start #x28000000)
69 (def!constant static-space-end #x2a000000)
71 (def!constant dynamic-space-start #x30000000)
72 (def!constant dynamic-space-end #x37fff000)
74 (def!constant dynamic-0-space-start #x30000000)
75 (def!constant dynamic-0-space-end #x37fff000)
76 (def!constant dynamic-1-space-start #x38000000)
77 (def!constant dynamic-1-space-end #x3ffff000)
79 ;;; FIXME: WTF are these for?
81 ;; The space-register holding the lisp heap.
82 (def!constant lisp-heap-space 5)
84 ;; The space-register holding the C text segment.
85 (def!constant c-text-space 4)
88 ;;;; Other random constants.
90 (defenum (:suffix -trap :start 8)
97 single-step-breakpoint)
99 (defenum (:prefix trace-table-)
109 ;;; These symbols are loaded into static space directly after NIL so
110 ;;; that the system can compute their address by adding a constant
113 ;;; The fdefn objects for the static functions are loaded into static
114 ;;; space directly after the static symbols. That way, the raw-addr
115 ;;; can be loaded directly out of them by indirecting relative to NIL.
117 (defparameter *static-symbols*
120 ;; The C startup code must fill these in.
123 ;; Functions that the C code needs to call
125 sb!kernel::internal-error
126 sb!kernel::control-stack-exhausted-error
127 sb!kernel::undefined-alien-variable-error
128 sb!kernel::undefined-alien-function-error
129 sb!di::handle-breakpoint
130 sb!impl::fdefinition-object
133 *read-only-space-free-pointer*
134 *static-space-free-pointer*
135 *initial-dynamic-space-free-pointer*
137 ;; Things needed for non-local-exit.
138 *current-catch-block*
139 *current-unwind-protect-block*
141 *binding-stack-start*
142 *control-stack-start*
145 ;; Interrupt Handling
146 *free-interrupt-context-index*
147 sb!unix::*interrupts-enabled*
148 sb!unix::*interrupt-pending*
151 (defparameter *static-funs*
162 sb!kernel:two-arg-and
163 sb!kernel:two-arg-ior
164 sb!kernel:two-arg-xor
165 sb!kernel:two-arg-gcd
166 sb!kernel:two-arg-lcm