mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-05-01 12:20:26 +02:00
f5473fbaaf
* module/system/vm/linker.scm (make-string-table): Rework to be a stateful object instead of a function object. Works better in this case. Adapt users. (string-table-intern!): Rename from string-table-intern, and just return the index of the string. (link-string-table!): Rename from link-string-table, and set a flag to prevent interning strings after linking, as that's not going to work well. * module/language/objcode/elf.scm (bytecode->elf): Adapt.
92 lines
4.3 KiB
Scheme
92 lines
4.3 KiB
Scheme
;;; Embedding bytecode in ELF
|
|
|
|
;; Copyright (C) 2012, 2013 Free Software Foundation, Inc.
|
|
|
|
;;;; This library is free software; you can redistribute it and/or
|
|
;;;; modify it under the terms of the GNU Lesser General Public
|
|
;;;; License as published by the Free Software Foundation; either
|
|
;;;; version 3 of the License, or (at your option) any later version.
|
|
;;;;
|
|
;;;; This library is distributed in the hope that it will be useful,
|
|
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
;;;; Lesser General Public License for more details.
|
|
;;;;
|
|
;;;; You should have received a copy of the GNU Lesser General Public
|
|
;;;; License along with this library; if not, write to the Free Software
|
|
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
;;; Code:
|
|
|
|
;; The eval-when is because (language objcode elf) will not be loaded
|
|
;; yet when we go to compile it, but later passes of the
|
|
;; compiler need it. So we have to be sure that the module is present
|
|
;; at compile time, with all of its definitions. The easiest way to do
|
|
;; that is just to go ahead and resolve it now.
|
|
;;
|
|
(define-module (language objcode elf)
|
|
#:use-module (system vm objcode)
|
|
#:use-module (system base target)
|
|
#:use-module (rnrs bytevectors)
|
|
#:use-module (ice-9 binary-ports)
|
|
#:use-module (system vm elf)
|
|
#:use-module (system vm linker)
|
|
#:export (write-objcode))
|
|
|
|
(define (bytecode->elf bv)
|
|
(let ((string-table (make-string-table)))
|
|
(define (intern-string! string)
|
|
(string-table-intern! string-table string))
|
|
(define (make-object index name bv relocs . kwargs)
|
|
(let ((name-idx (intern-string! (symbol->string name))))
|
|
(make-linker-object (apply make-elf-section
|
|
#:index index
|
|
#:name name-idx
|
|
#:size (bytevector-length bv)
|
|
kwargs)
|
|
bv relocs
|
|
(list (make-linker-symbol name 0)))))
|
|
(define (make-dynamic-section index word-size endianness)
|
|
(define (make-dynamic-section/32)
|
|
(let ((bv (make-bytevector 24 0)))
|
|
(bytevector-u32-set! bv 0 DT_GUILE_RTL_VERSION endianness)
|
|
(bytevector-u32-set! bv 4 #x02000000 endianness)
|
|
(bytevector-u32-set! bv 8 DT_GUILE_ENTRY endianness)
|
|
(bytevector-u32-set! bv 12 0 endianness)
|
|
(bytevector-u32-set! bv 16 DT_NULL endianness)
|
|
(bytevector-u32-set! bv 20 0 endianness)
|
|
(values bv (make-linker-reloc 'abs32/1 12 0 '.rtl-text))))
|
|
(define (make-dynamic-section/64)
|
|
(let ((bv (make-bytevector 48 0)))
|
|
(bytevector-u64-set! bv 0 DT_GUILE_RTL_VERSION endianness)
|
|
(bytevector-u64-set! bv 8 #x02000000 endianness)
|
|
(bytevector-u64-set! bv 16 DT_GUILE_ENTRY endianness)
|
|
(bytevector-u64-set! bv 24 0 endianness)
|
|
(bytevector-u64-set! bv 32 DT_NULL endianness)
|
|
(bytevector-u64-set! bv 40 0 endianness)
|
|
(values bv (make-linker-reloc 'abs64/1 24 0 '.rtl-text))))
|
|
(call-with-values (lambda ()
|
|
(case word-size
|
|
((4) (make-dynamic-section/32))
|
|
((8) (make-dynamic-section/64))
|
|
(else (error "unexpected word size" word-size))))
|
|
(lambda (bv reloc)
|
|
(make-object index '.dynamic bv (list reloc)
|
|
#:type SHT_DYNAMIC #:flags SHF_ALLOC))))
|
|
(define (make-string-table index)
|
|
(intern-string! ".shstrtab")
|
|
(make-object index '.shstrtab (link-string-table! string-table) '()
|
|
#:type SHT_STRTAB #:flags 0))
|
|
(let* ((word-size (target-word-size))
|
|
(endianness (target-endianness))
|
|
(text (make-object 1 '.rtl-text bv '()))
|
|
(dt (make-dynamic-section 2 word-size endianness))
|
|
;; This needs to be linked last, because linking other
|
|
;; sections adds entries to the string table.
|
|
(shstrtab (make-string-table 3)))
|
|
(link-elf (list text dt shstrtab)
|
|
#:endianness endianness #:word-size word-size))))
|
|
|
|
(define (write-objcode objcode port)
|
|
(let ((bv (objcode->bytecode objcode (target-endianness))))
|
|
(put-bytevector port (bytecode->elf bv))))
|