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102 lines
3.9 KiB
Scheme
102 lines
3.9 KiB
Scheme
;;; reloc.ss
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;;; Copyright 1984-2017 Cisco Systems, Inc.
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;;;
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;;; Licensed under the Apache License, Version 2.0 (the "License");
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;;; you may not use this file except in compliance with the License.
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;;; You may obtain a copy of the License at
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;;;
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;;; http://www.apache.org/licenses/LICENSE-2.0
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;;;
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;;; Unless required by applicable law or agreed to in writing, software
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;;; distributed under the License is distributed on an "AS IS" BASIS,
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;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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;;; See the License for the specific language governing permissions and
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;;; limitations under the License.
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(begin
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(define $reloc
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(lambda (type item-offset code-offset)
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(make-reloc type item-offset code-offset
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(or (> item-offset (constant reloc-item-offset-mask))
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(> code-offset (constant reloc-code-offset-mask))))))
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(define $make-relocation-table!
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(let ()
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(define link-code-object!
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(foreign-procedure "(cs)link_code_object"
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(scheme-object scheme-object)
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void))
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(define set-reloc!
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(foreign-procedure "(cs)s_set_reloc"
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(scheme-object scheme-object scheme-object)
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scheme-object))
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(define make-reloc-table
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(foreign-procedure "(cs)s_make_reloc_table"
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(scheme-object scheme-object)
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scheme-object))
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(lambda (p r* objs)
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(make-reloc-table p (fold-left (lambda (m r) (fx+ m (if (reloc-long? r) 3 1))) 0 r*))
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(let mkc1 ([r* r*] [n 0])
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(if (null? r*)
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(link-code-object! p objs)
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(let ([r (car r*)] [r* (cdr r*)])
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(if (reloc-long? r)
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(begin
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(set-reloc! p n
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(logor
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(bitwise-arithmetic-shift-left (reloc-type r) (constant reloc-type-offset))
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(constant reloc-extended-format)))
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(set-reloc! p (fx+ n 1) (reloc-item-offset r))
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(set-reloc! p (fx+ n 2) (reloc-code-offset r))
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(mkc1 r* (fx+ n 3)))
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(begin
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(set-reloc! p n
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(logor
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(bitwise-arithmetic-shift-left (reloc-type r) (constant reloc-type-offset))
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(bitwise-arithmetic-shift-left (reloc-code-offset r) (constant reloc-code-offset-offset))
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(bitwise-arithmetic-shift-left (reloc-item-offset r) (constant reloc-item-offset-offset))))
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(mkc1 r* (fx+ n 1))))))))))
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(let ()
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(set! $make-cinst
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(lambda (build-sinst vtable)
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(critical-section
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(let ([p ($make-code-object
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(if (eq? (subset-mode) 'system) (constant code-flag-system) 0)
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0
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"cinst"
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(* 2 (constant ptr-bytes))
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#f
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'())])
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($make-relocation-table! p
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(list ($reloc (constant reloc-abs) 0 (constant ptr-bytes))
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($reloc (constant reloc-abs) (constant code-data-disp)
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(constant code-data-disp)))
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(list vtable (build-sinst p)))
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p))))
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(set! $make-vtable
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(lambda (foreign-entries)
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(let ([n (length foreign-entries)])
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(let loop ([i n] [r '()] [offset (constant code-data-disp)])
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(if (fx= i 0)
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(critical-section
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(let ([p ($make-code-object
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(if (eq? (subset-mode) 'system) (constant code-flag-system) 0)
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0
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"vtable"
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(* n (constant ptr-bytes))
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#f
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'())])
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($make-relocation-table! p r foreign-entries)
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p))
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(loop (fx- i 1)
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(cons ($reloc
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(constant reloc-abs)
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(constant code-data-disp)
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offset)
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r)
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(constant ptr-bytes)))))))
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)
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)
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