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; $Id: kmoddeps.mac $
;; @file
; Assembly macros for generating Solaris kernel module dependencies
;
;
; Copyright (C) 2012-2022 Oracle and/or its affiliates.
;
; This file is part of VirtualBox base platform packages, as
; available from https://www.virtualbox.org.
;
; This program 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, in version 3 of the
; License.
;
; This program 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 this program; if not, see <https://www.gnu.org/licenses>.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
; in the VirtualBox distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
;
; Solaris kernel modules use non-standard ELF constructions to express inter-
; module dependencies, namely a DT_NEEDED tag inside a relocatable ELF file.
; The Solaris linker can generate these automatically; since yasm can't
; produce an ELF file which quite fits Solaris's requirements we create one
; manually using flat binary output format. In order to save unnecessary
; repetition, this file defines macros for the repetitive bits which can be
; reused by the actual dependency objects. Certainly not the nicest way to
; get the effect we want, but probably a reasonable compromise between
; cleanness and required effort.
;
%ifdef RT_ARCH_AMD64
BITS 64
;;
; Native word size
%define DNAT dq
;;
; ELF machine number for the current architecture.
%define EM_CUR 62 ; EM_X86_64
;;
; ELF header class for the current architecture.
%define CLASS 2
%else
BITS 32
%define DNAT dd
%define EM_CUR 3 ; EM_386
%define CLASS 1
%endif
;;
; ELF file header, section tables and shared string table for the dependency
; object.
%macro kmoddeps_header 0
elf_hdr: ; elfxx_hdr structure
db 7fh, "ELF" ; e_ident
db CLASS, 1, 1 ; e_ident
times 9 db 0 ; padding
dw 1 ; e_type ET_REL
dw EM_CUR ; e_machine
dd 1 ; e_version EV_CURRENT
DNAT 0 ; e_entry
DNAT 0 ; e_phoff
DNAT sect_hdr - $$ ; e_shoff
dd 0 ; e_flags
dw elf_hsize ; e_ehsize
dw 0 ; e_phentsize
dw 0 ; e_phnum
dw sect_hsize ; e_shentsize
dw 4 ; e_shnum
dw 1 ; e_shstrndx section .shstrtab
elf_hsize equ $ - elf_hdr
sect_hdr: ; elfxx_shdr structure
times sect_hsize db 0 ; undefined section
sect_hdr1:
dd str_shstrtab ; sh_name .shstrtab
dd 3 ; sh_type SHT_STRTAB
DNAT 20h ; sh_flags SHF_STRINGS
DNAT 0 ; sh_addr
DNAT shstrtab - $$ ; sh_offset
DNAT shstrtab_size ; sh_size
dd 0 ; sh_link
dd 0 ; sh_info
DNAT 1 ; sh_addralign
DNAT 0 ; sh_entsize
sect_hsize equ $ - sect_hdr1
dd str_dynstr ; sh_name .dynstr
dd 3 ; sh_type SHT_STRTAB
DNAT 20h ; sh_flags SHF_STRINGS
DNAT 0 ; sh_addr
DNAT dynstr - $$ ; sh_offset
DNAT dynstr_size ; sh_size
dd 0 ; sh_link
dd 0 ; sh_info
DNAT 1 ; sh_addralign
DNAT 0 ; sh_entsize
dd str_dynamic ; sh_name .dynamic
dd 6 ; sh_type SHT_DYNAMIC
DNAT 1 ; sh_flags SHF_WRITE
DNAT 0 ; sh_addr
DNAT dynamic - $$ ; sh_offset
DNAT dynamic_size ; sh_size
dd 2 ; sh_link .dynstr
dd 0 ; sh_info
DNAT 8 ; sh_addralign
DNAT 0 ; sh_entsize
shstrtab:
str_shstrtab equ $ - shstrtab
db ".shstrtab", 0
str_dynstr equ $ - shstrtab
db ".dynstr", 0
str_dynamic equ $ - shstrtab
db ".dynamic", 0
shstrtab_size equ $ - shstrtab
%endmacro ; kmoddeps_header
;;
; Start of the .dynstr section for the dependency object.
%macro kmoddeps_dynstr_start 0
dynstr:
db 0
%endmacro
;;
; A .dynstr string entry for the dependency object.
; The parameters are a symbolic name for the string and the string itself.
%macro kmoddeps_dynstr_string 2
dynstr_name_%1 equ $ - dynstr
db %2, 0
%endmacro
;;
; End of the .dynstr section for the dependency object.
%macro kmoddeps_dynstr_end 0
dynstr_size equ $ - dynstr
%endmacro
;;
; Start of the .dynamic section for the dependency object.
%macro kmoddeps_dynamic_start 0
dynamic:
%endmacro
;;
; A .dynamic DT_NEEDED entry for the dependency object.
; The parameter is a symbolic string name previously defined using
; @a kmoddeps_dynstr_string.
%macro kmoddeps_dynamic_needed 1
DNAT 1 ; DT_NEEDED
DNAT dynstr_name_%1
%endmacro
;;
; End of the .dynamic section for the dependency object.
%macro kmoddeps_dynamic_end 0
DNAT 1ah ; DT_FLAGS
DNAT 4 ; TEXTREL
DNAT 6ffffffbh ; DT_FLAGS1
DNAT 0
DNAT 601900h ; SUNW_STRPAD
DNAT 200h
DNAT 601b00h ; SUNW_LDMACH
DNAT 62 ; EM_X86_64
times 22 DNAT 0 ; padding
dynamic_size equ $ - dynamic
%endmacro ; kmoddeps_dynamic_end
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