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;;; ld-script.el --- GNU linker script editing mode for Emacs -*- lexical-binding:t -*-
;; Copyright (C) 2001-2021 Free Software Foundation, Inc.
;; Author: Masatake YAMATO <yamato@redhat.com>
;; Keywords: languages, faces
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs 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 General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Major mode for editing GNU linker (ld) scripts.
;;; Code:
;; Custom
(defgroup ld-script nil
"GNU linker script code editing commands for Emacs."
:prefix "ld-script-"
:group 'languages)
(defvar ld-script-location-counter-face 'ld-script-location-counter)
(defface ld-script-location-counter
'((t :weight bold :inherit font-lock-builtin-face))
"Face for location counter in GNU ld script.")
;; Syntax rules
(defvar ld-script-mode-syntax-table
(let ((st (make-syntax-table)))
(modify-syntax-entry ?\ "-" st)
(modify-syntax-entry ?{ "(}" st)
(modify-syntax-entry ?} "){" st)
(modify-syntax-entry ?\( "()" st)
(modify-syntax-entry ?\) ")(" st)
(modify-syntax-entry ?\[ "(]" st)
(modify-syntax-entry ?\] ")[" st)
(modify-syntax-entry ?_ "_" st)
(modify-syntax-entry ?. "_" st)
(modify-syntax-entry ?\\ "\\" st)
(modify-syntax-entry ?: "." st)
(modify-syntax-entry ?, "." st)
(modify-syntax-entry ?? "." st)
(modify-syntax-entry ?= "." st)
(modify-syntax-entry ?* ". 23" st)
(modify-syntax-entry ?/ ". 14" st)
(modify-syntax-entry ?+ "." st)
(modify-syntax-entry ?- "." st)
(modify-syntax-entry ?! "." st)
(modify-syntax-entry ?~ "." st)
(modify-syntax-entry ?% "." st)
(modify-syntax-entry ?< "." st)
(modify-syntax-entry ?> "." st)
(modify-syntax-entry ?& "." st)
(modify-syntax-entry ?| "." st)
(modify-syntax-entry ?\" "\"" st)
st)
"Syntax table used while in `ld-script-mode'.")
;; Font lock keywords
;; (The section number comes from ld's info.)
(defvar ld-script-keywords
'(
;; 3.4.1 Setting the Entry Point
"ENTRY"
;; 3.4.2 Commands Dealing with Files
"INCLUDE" "INPUT" "GROUP" "AS_NEEDED" "OUTPUT" "SEARCH_DIR" "STARTUP"
;; 3.4.3 Commands Dealing with Object File Formats
"OUTPUT_FORMAT" "TARGET"
;; 3.4.4 Assign alias names to memory regions
"REGION_ALIAS"
;; 3.4.5 Other Linker Script Commands
"ASSERT" "EXTERN" "FORCE_COMMON_ALLOCATION"
"INHIBIT_COMMON_ALLOCATION" "INSERT" "AFTER" "BEFORE"
"NOCROSSREFS" "NOCROSSREFS_TO" "OUTPUT_ARCH" "LD_FEATURE"
;; 3.5.2 HIDDEN
"HIDDEN"
;; 3.5.3 PROVIDE
"PROVIDE"
;; 3.5.4 PROVIDE_HIDDEN
"PROVIDE_HIDDEN"
;; 3.6 SECTIONS Command
"SECTIONS"
;; 3.6.4.2 Input Section Wildcard Patterns
"SORT" "SORT_BY_NAME" "SORT_BY_ALIGNMENT" "SORT_BY_INIT_PRIORITY"
;; 3.6.4.3 Input Section for Common Symbols
"COMMON"
;; 3.6.4.4 Input Section and Garbage Collection
"KEEP"
;; 3.6.5 Output Section Data
"BYTE" "SHORT" "LONG" "QUAD" "SQUAD" "FILL"
;; 3.6.6 Output Section Keywords
"CREATE_OBJECT_SYMBOLS" "CONSTRUCTORS"
"__CTOR_LIST__" "__CTOR_END__" "__DTOR_LIST__" "__DTOR_END__"
;; 3.6.7 Output Section Discarding
;; See `ld-script-font-lock-keywords'
;; 3.6.8.1 Output Section Type
"NOLOAD" "DSECT" "COPY" "INFO" "OVERLAY"
;; 3.6.8.2 Output Section LMA
"AT"
;; 3.6.8.4 Forced Input Alignment
"SUBALIGN"
;; 3.6.8.5 Output Section Constraint
"ONLY_IF_RO" "ONLY_IF_RW"
;; 3.6.8.7 Output Section Phdr
":PHDR"
;; 3.7 MEMORY Command
"MEMORY"
;; 3.8 PHDRS Command
"PHDRS" "FILEHDR" "FLAGS"
"PT_NULL" "PT_LOAD" "PT_DYNAMIC" "PT_INTERP" "PT_NOTE" "PT_SHLIB" "PT_PHDR"
;; 3.9 VERSION Command
"VERSION")
"Keywords used of GNU ld script.")
;; 3.10.2 Symbolic Constants
;; 3.10.9 Builtin Functions
(defvar ld-script-builtins
'("CONSTANT"
"MAXPAGESIZE"
"COMMONPAGESIZE"
"ABSOLUTE"
"ADDR"
"ALIGN"
"ALIGNOF"
"BLOCK"
"DATA_SEGMENT_ALIGN"
"DATA_SEGMENT_END"
"DATA_SEGMENT_RELRO_END"
"DEFINED"
"LENGTH" "len" "l"
"LOADADDR"
"LOG2CEIL"
"MAX"
"MIN"
"NEXT"
"ORIGIN" "org" "o"
"SEGMENT_START"
"SIZEOF"
"SIZEOF_HEADERS"
"sizeof_headers")
"Builtin functions of GNU ld script.")
(defvar ld-script-font-lock-keywords
(append
`((,(concat "\\_<" (regexp-opt ld-script-keywords) "\\_>")
0 font-lock-keyword-face)
(,(concat "\\_<" (regexp-opt ld-script-builtins) "\\_>")
0 font-lock-builtin-face)
;; 3.6.7 Output Section Discarding
;; 3.6.4.1 Input Section Basics
;; 3.6.8.7 Output Section Phdr
("/DISCARD/\\|EXCLUDE_FILE\\|:NONE" . font-lock-warning-face)
("\\W\\(\\.\\)\\W" 1 ld-script-location-counter-face)
)
cpp-font-lock-keywords)
"Default font-lock-keywords for `ld-script-mode'.")
;;;###autoload
(define-derived-mode ld-script-mode prog-mode "LD-Script"
"A major mode to edit GNU ld script files"
(setq-local comment-start "/* ")
(setq-local comment-end " */")
(setq-local font-lock-defaults '(ld-script-font-lock-keywords nil)))
(provide 'ld-script)
;;; ld-script.el ends here
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