1 ;;;; This file contains some parameterizations of various VM
2 ;;;; attributes for the PPC. This file is separate from other stuff so
3 ;;;; that it can be compiled and loaded earlier.
8 (def!constant n-word-bits 32
9 "Number of bits per word where a word holds one lisp descriptor.")
11 (def!constant n-byte-bits 8
12 "Number of bits per byte where a byte is the smallest addressable object.")
14 (def!constant word-shift (1- (integer-length (/ n-word-bits n-byte-bits)))
15 "Number of bits to shift between word addresses and byte addresses.")
17 (def!constant n-word-bytes (/ n-word-bits n-byte-bits)
18 "Number of bytes in a word.")
21 (def!constant float-sign-shift 31)
23 (def!constant single-float-bias 126)
24 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equalp)
25 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
26 (def!constant single-float-normal-exponent-min 1)
27 (def!constant single-float-normal-exponent-max 254)
28 (def!constant single-float-hidden-bit (ash 1 23))
29 (def!constant single-float-trapping-nan-bit (ash 1 22))
31 (def!constant double-float-bias 1022)
32 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equalp)
33 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equalp)
34 (def!constant double-float-normal-exponent-min 1)
35 (def!constant double-float-normal-exponent-max #x7FE)
36 (def!constant double-float-hidden-bit (ash 1 20))
37 (def!constant double-float-trapping-nan-bit (ash 1 19))
39 (def!constant single-float-digits
40 (+ (byte-size single-float-significand-byte) 1))
42 (def!constant double-float-digits
43 (+ (byte-size double-float-significand-byte) n-word-bits 1))
46 (def!constant float-inexact-trap-bit (ash 1 0))
47 (def!constant float-divide-by-zero-trap-bit (ash 1 1))
48 (def!constant float-underflow-trap-bit (ash 1 2))
49 (def!constant float-overflow-trap-bit (ash 1 3))
50 (def!constant float-invalid-trap-bit (ash 1 4))
52 (def!constant float-round-to-nearest 0)
53 (def!constant float-round-to-zero 1)
54 (def!constant float-round-to-positive 2)
55 (def!constant float-round-to-negative 3)
57 (defconstant-eqx float-rounding-mode (byte 2 0) #'equalp) ; RD
58 ;;; FIXME I: Beware, all ye who trespass here. Despite its name,
59 ;;; FLOAT-STICKY-BITS is not the byte specifier for sticky bits in the
60 ;;; floating point control word. It is more like "accrued exceptions"
61 ;;; where FLOAT-EXCEPTIONS-BYTE is "current exceptions". Consequently,
62 ;;; on architectures where there is no "current exceptions"
63 ;;; FLOAT-EXCEPTIONS-BYTE and FLOAT-STICKY-BITS had better be the
66 ;;; FIXME II: So, I've now documented this in comments in the PowerPC
67 ;;; tree. This may not make it easy to find for when new architectures
68 ;;; get backends written...
71 (defconstant-eqx float-sticky-bits (byte 5 25) #'equalp)
72 (defconstant-eqx float-traps-byte (byte 5 3) #'equalp)
73 (defconstant-eqx float-exceptions-byte (byte 5 25) #'equalp) ; cexc
75 (def!constant float-fast-bit 2) ; Non-IEEE mode
78 ;;; NUMBER-STACK-DISPLACEMENT
80 ;;; The number of bytes reserved above the number stack pointer. These
81 ;;; slots are required by architecture, mostly (?) to make C backtrace
84 (def!constant number-stack-displacement
85 (* 2 sb!vm:n-word-bytes))
90 ;;; Where to put the different spaces.
93 (def!constant read-only-space-start #x01000000)
94 (def!constant read-only-space-end #x04ff8000)
96 (def!constant binding-stack-start #x06000000)
97 (def!constant binding-stack-end #x06ff0000)
99 (def!constant control-stack-start #x07000000)
100 (def!constant control-stack-end #x07ff0000)
102 (def!constant static-space-start #x08000000)
103 (def!constant static-space-end #x097fff00)
105 ;;; FIXME: this is a gross violation of OAOO, done purely to support
106 ;;; the #define of DYNAMIC_SPACE_SIZE in validate.c -- CSR, 2002-02-25
107 ;;; (these numbers should match dynamic-0-*)
108 (def!constant dynamic-space-start #x40000000)
109 (def!constant dynamic-space-end #x47fff000)
111 ;;; nothing _seems_ to be using these addresses
112 (def!constant dynamic-0-space-start #x40000000)
113 (def!constant dynamic-0-space-end #x47fff000)
114 (def!constant dynamic-1-space-start #x48000000)
115 (def!constant dynamic-1-space-end #x4ffff000)
120 ;;;; Other random constants.
122 (defenum (:suffix -trap :start 8)
130 fixnum-additive-overflow)
132 (defenum (:prefix object-not- :suffix -trap :start 16)
136 (defenum (:prefix trace-table-)
146 ;;; These symbols are loaded into static space directly after NIL so
147 ;;; that the system can compute their address by adding a constant
150 ;;; The fdefn objects for the static functions are loaded into static
151 ;;; space directly after the static symbols. That way, the raw-addr
152 ;;; can be loaded directly out of them by indirecting relative to NIL.
154 (defparameter *static-symbols*
157 ;; The C startup code must fill these in.
159 sb!impl::*initial-fdefn-objects*
161 ;; Functions that the C code needs to call
162 ;; sb!impl::%initial-fun
164 sb!kernel::internal-error
165 sb!di::handle-breakpoint
166 sb!impl::fdefinition-object
169 *read-only-space-free-pointer*
170 *static-space-free-pointer*
171 *initial-dynamic-space-free-pointer*
173 ;; Things needed for non-local-exit.
174 *current-catch-block*
175 *current-unwind-protect-block*
177 ;; Interrupt Handling
178 *free-interrupt-context-index*
179 sb!unix::*interrupts-enabled*
180 sb!unix::*interrupt-pending*
182 #|sb!kernel::*current-thread*|#
185 (defparameter *static-funs*
199 sb!kernel:two-arg-and
200 sb!kernel:two-arg-ior
201 sb!kernel:two-arg-xor
202 sb!kernel:two-arg-gcd
203 sb!kernel:two-arg-lcm))
206 ;;;; Assembler parameters:
208 ;;; The number of bits per element in the assemblers code vector.
210 (defparameter *assembly-unit-length* 8)