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3cd64feb2e
This reduces the amount of memory that needs to be allocated while writing the ELF file to disk. Note: We're abusing #:page-aligned? in 'link-elf' to choose whether to return a bytevector or a procedure. * module/system/vm/linker.scm (process-reloc): Subtract SECTION-OFFSET when writing to BV. (write-linker-object): Pass BV directly to the linker object writer. (link-elf): When PAGE-ALIGNED? is false, call 'bytevector-slice' from here. When it is true, return a procedure that takes a port and writes to it, without having to allocate a bytevector for the whole ELF container. * module/language/bytecode/spec.scm (bytecode->value): Handle X being a procedure instead of a bytevector. (bytecode) <#:printer>: Likewise. * test-suite/tests/linker.test (link-elf-with-one-main-section): Pass #:page-aligned? #f.
93 lines
3.9 KiB
Scheme
93 lines
3.9 KiB
Scheme
;;;; linker.test -*- scheme -*-
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;;;;
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;;;; Copyright 2013, 2019, 2023 Free Software Foundation, Inc.
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;;;;
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 3 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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(define-module (test-suite test-linker)
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#:use-module (test-suite lib)
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#:use-module (rnrs bytevectors)
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#:use-module (system base target)
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#:use-module (system vm elf)
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#:use-module (system vm linker))
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(define (link-elf-with-one-main-section name bytes)
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(let ((strtab (make-string-table)))
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(define (make-object index name size writer relocs . kwargs)
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(let ((name-idx (string-table-intern! strtab (symbol->string name))))
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(make-linker-object (symbol->string name)
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(apply make-elf-section
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#:index index
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#:name name-idx
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#:size size
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kwargs)
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size writer relocs
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(list (make-linker-symbol name 0)))))
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(define (make-shstrtab)
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(string-table-intern! strtab ".shstrtab")
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(make-object 2 '.shstrtab
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(string-table-size strtab)
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(string-table-writer strtab)
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'()
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#:type SHT_STRTAB #:flags 0))
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(let* ((word-size (target-word-size))
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(endianness (target-endianness))
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(sec (make-object 1 name
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(bytevector-length bytes)
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(lambda (bv)
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(bytevector-copy! bytes 0 bv 0
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(bytevector-length
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bytes)))
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'()))
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;; This needs to be linked last, because linking other
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;; sections adds entries to the string table.
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(shstrtab (make-shstrtab)))
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(link-elf (list sec shstrtab)
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#:page-aligned? #f ;return a bytevector
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#:endianness endianness #:word-size word-size))))
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(with-test-prefix "simple"
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(define foo-bytes #vu8(0 1 2 3 4 5))
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(define bytes #f)
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(define elf #f)
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(define (bytevectors-equal? bv-a bv-b start-a start-b size)
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(or (zero? size)
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(and (equal? (bytevector-u8-ref bv-a start-a)
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(bytevector-u8-ref bv-b start-b))
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(bytevectors-equal? bv-a bv-b (1+ start-a) (1+ start-b)
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(1- size)))))
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(pass-if "linking succeeds"
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(begin
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(set! bytes (link-elf-with-one-main-section '.foo foo-bytes))
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#t))
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(pass-if "parsing succeeds"
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(begin
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(set! elf (parse-elf bytes))
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(elf? elf)))
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;; 5 sections: the initial NULL section, .foo, .shstrtab, the initial
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;; header with segment table, and the section table.
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(pass-if-equal 5 (elf-shnum elf))
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(pass-if ".foo section checks out"
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(let ((sec (assoc-ref (elf-sections-by-name elf) ".foo")))
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(and sec
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(= (elf-section-size sec) (bytevector-length foo-bytes))
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(bytevectors-equal? bytes foo-bytes
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(elf-section-offset sec) 0
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(bytevector-length foo-bytes))))))
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