Make the ELF kernel build produce a dynamic executable (!). This enables
the in-kernel linker to access the _DYNAMIC data for doing loadable elf modules. The alpha kernel is already done this way, I've borrowed some of the hacks from there. This is primarily aimed at the 3-stage boot process which is intended to be able to do pre-loading of kernel modules. Note that the entry point isn't 0xf0100000 any more, it'll be a little further on - but this value is stored in the headers. I don't think this will be a problem, but I'm sure somebody will tell me if it is. :-) I'm not sure if btxboot is going to like this, it doesn't do proper ELF header checking and assumes that there are exactly two program header entries and that they are both PT_LOAD entries - a bad assumption.
This commit is contained in:
Peter Wemm
parent
26e4260723
commit
6b7a14ce57
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=39818
@ -1,7 +1,7 @@
|
||||
# Makefile.i386 -- with config changes.
|
||||
# Copyright 1990 W. Jolitz
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||||
# from: @(#)Makefile.i386 7.1 5/10/91
|
||||
# $Id: Makefile.i386,v 1.123 1998/09/15 21:07:07 gibbs Exp $
|
||||
# $Id: Makefile.i386,v 1.124 1998/09/21 06:39:11 bde Exp $
|
||||
#
|
||||
# Makefile for FreeBSD
|
||||
#
|
||||
@ -101,11 +101,14 @@ SYSTEM_LD_TAIL= @echo rearranging symbols; \
|
||||
size -aout ${.TARGET} ; chmod 755 ${.TARGET}
|
||||
.endif
|
||||
.if ${KERNFORMAT} == elf
|
||||
# kld compatable export of symbols.
|
||||
SYSTEM_OBJS= locore.o setdef0.o vnode_if.o ${OBJS} ioconf.o param.o config.o \
|
||||
setdef1.o
|
||||
SYSTEM_LD= @${LD} -elf -Bstatic -Ttext ${LOAD_ADDRESS} -e btext -defsym _DYNAMIC=0 \
|
||||
setdef1.o hack.so
|
||||
SYSTEM_LD= @${LD} -elf -Bdynamic -T $S/i386/conf/kernel.script \
|
||||
-export-dynamic -dynamic-linker /red/herring \
|
||||
-o ${.TARGET} -X ${SYSTEM_OBJS} vers.o
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||||
SYSTEM_LD_TAIL= @size -elf ${.TARGET} ; chmod 755 ${.TARGET}
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SYSTEM_DEP+= $S/i386/conf/kernel.script
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||||
.endif
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||||
|
||||
%BEFORE_DEPEND
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||||
@ -144,6 +147,16 @@ symbols.sort: ${I386}/i386/symbols.raw
|
||||
locore.o: ${I386}/i386/locore.s assym.s
|
||||
${NORMAL_S}
|
||||
|
||||
.if ${KERNFORMAT} == elf
|
||||
# This is a hack. BFD "optimizes" away dynamic mode if there are no
|
||||
# dynamic references. We could probably do a '-Bforcedynamic' mode like
|
||||
# in the a.out ld. For now, this works.
|
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hack.so: Makefile
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touch hack.c
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${CC} -elf -shared -nostdlib hack.c -o hack.so
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rm -f hack.c
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||||
.endif
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||||
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setdef0.o: ${I386}/i386/setdef0.c setdefs.h
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${NORMAL_C}
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||||
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||||
|
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@ -1,7 +1,7 @@
|
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# Makefile.i386 -- with config changes.
|
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# Copyright 1990 W. Jolitz
|
||||
# from: @(#)Makefile.i386 7.1 5/10/91
|
||||
# $Id: Makefile.i386,v 1.123 1998/09/15 21:07:07 gibbs Exp $
|
||||
# $Id: Makefile.i386,v 1.124 1998/09/21 06:39:11 bde Exp $
|
||||
#
|
||||
# Makefile for FreeBSD
|
||||
#
|
||||
@ -101,11 +101,14 @@ SYSTEM_LD_TAIL= @echo rearranging symbols; \
|
||||
size -aout ${.TARGET} ; chmod 755 ${.TARGET}
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||||
.endif
|
||||
.if ${KERNFORMAT} == elf
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||||
# kld compatable export of symbols.
|
||||
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setdef1.o
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setdef1.o hack.so
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SYSTEM_LD= @${LD} -elf -Bdynamic -T $S/i386/conf/kernel.script \
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-export-dynamic -dynamic-linker /red/herring \
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-o ${.TARGET} -X ${SYSTEM_OBJS} vers.o
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SYSTEM_LD_TAIL= @size -elf ${.TARGET} ; chmod 755 ${.TARGET}
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|
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# This is a hack. BFD "optimizes" away dynamic mode if there are no
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# dynamic references. We could probably do a '-Bforcedynamic' mode like
|
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# in the a.out ld. For now, this works.
|
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hack.so: Makefile
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touch hack.c
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${CC} -elf -shared -nostdlib hack.c -o hack.so
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rm -f hack.c
|
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||||
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||||
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||||
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|
||||
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|
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|
||||
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|
||||
@ -101,11 +101,14 @@ SYSTEM_LD_TAIL= @echo rearranging symbols; \
|
||||
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|
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|
||||
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|
||||
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|
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|
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|
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|
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|
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|
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|
||||
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
hack.so: Makefile
|
||||
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|
||||
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|
||||
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|
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|
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|
||||
setdef0.o: ${I386}/i386/setdef0.c setdefs.h
|
||||
${NORMAL_C}
|
||||
|
||||
|
||||
128
sys/i386/conf/kernel.script
Normal file
128
sys/i386/conf/kernel.script
Normal file
@ -0,0 +1,128 @@
|
||||
OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
|
||||
OUTPUT_ARCH(i386)
|
||||
ENTRY(btext)
|
||||
SEARCH_DIR(/usr/lib); SEARCH_DIR(/usr/obj/elf/home/src/tmp/usr/i386-unknown-freebsdelf/lib);
|
||||
SECTIONS
|
||||
{
|
||||
/* Read-only sections, merged into text segment: */
|
||||
. = 0xf0100000 + SIZEOF_HEADERS;
|
||||
.interp : { *(.interp) }
|
||||
.hash : { *(.hash) }
|
||||
.dynsym : { *(.dynsym) }
|
||||
.dynstr : { *(.dynstr) }
|
||||
.gnu.version : { *(.gnu.version) }
|
||||
.gnu.version_d : { *(.gnu.version_d) }
|
||||
.gnu.version_r : { *(.gnu.version_r) }
|
||||
.rel.text :
|
||||
{ *(.rel.text) *(.rel.gnu.linkonce.t*) }
|
||||
.rela.text :
|
||||
{ *(.rela.text) *(.rela.gnu.linkonce.t*) }
|
||||
.rel.data :
|
||||
{ *(.rel.data) *(.rel.gnu.linkonce.d*) }
|
||||
.rela.data :
|
||||
{ *(.rela.data) *(.rela.gnu.linkonce.d*) }
|
||||
.rel.rodata :
|
||||
{ *(.rel.rodata) *(.rel.gnu.linkonce.r*) }
|
||||
.rela.rodata :
|
||||
{ *(.rela.rodata) *(.rela.gnu.linkonce.r*) }
|
||||
.rel.got : { *(.rel.got) }
|
||||
.rela.got : { *(.rela.got) }
|
||||
.rel.ctors : { *(.rel.ctors) }
|
||||
.rela.ctors : { *(.rela.ctors) }
|
||||
.rel.dtors : { *(.rel.dtors) }
|
||||
.rela.dtors : { *(.rela.dtors) }
|
||||
.rel.init : { *(.rel.init) }
|
||||
.rela.init : { *(.rela.init) }
|
||||
.rel.fini : { *(.rel.fini) }
|
||||
.rela.fini : { *(.rela.fini) }
|
||||
.rel.bss : { *(.rel.bss) }
|
||||
.rela.bss : { *(.rela.bss) }
|
||||
.rel.plt : { *(.rel.plt) }
|
||||
.rela.plt : { *(.rela.plt) }
|
||||
.init : { *(.init) } =0x9090
|
||||
.plt : { *(.plt) }
|
||||
.text :
|
||||
{
|
||||
*(.text)
|
||||
*(.stub)
|
||||
/* .gnu.warning sections are handled specially by elf32.em. */
|
||||
*(.gnu.warning)
|
||||
*(.gnu.linkonce.t*)
|
||||
} =0x9090
|
||||
_etext = .;
|
||||
PROVIDE (etext = .);
|
||||
.fini : { *(.fini) } =0x9090
|
||||
.rodata : { *(.rodata) *(.gnu.linkonce.r*) }
|
||||
.rodata1 : { *(.rodata1) }
|
||||
/* Adjust the address for the data segment. We want to adjust up to
|
||||
the same address within the page on the next page up. */
|
||||
. = ALIGN(0x1000) + (. & (0x1000 - 1)) ;
|
||||
.data :
|
||||
{
|
||||
*(.data)
|
||||
*(.gnu.linkonce.d*)
|
||||
CONSTRUCTORS
|
||||
}
|
||||
.data1 : { *(.data1) }
|
||||
.ctors :
|
||||
{
|
||||
*(.ctors)
|
||||
}
|
||||
.dtors :
|
||||
{
|
||||
*(.dtors)
|
||||
}
|
||||
.got : { *(.got.plt) *(.got) }
|
||||
.dynamic : { *(.dynamic) }
|
||||
/* We want the small data sections together, so single-instruction offsets
|
||||
can access them all, and initialized data all before uninitialized, so
|
||||
we can shorten the on-disk segment size. */
|
||||
.sdata : { *(.sdata) }
|
||||
_edata = .;
|
||||
PROVIDE (edata = .);
|
||||
__bss_start = .;
|
||||
.sbss : { *(.sbss) *(.scommon) }
|
||||
.bss :
|
||||
{
|
||||
*(.dynbss)
|
||||
*(.bss)
|
||||
*(COMMON)
|
||||
}
|
||||
. = ALIGN(32 / 8);
|
||||
_end = . ;
|
||||
PROVIDE (end = .);
|
||||
/* Stabs debugging sections. */
|
||||
.stab 0 : { *(.stab) }
|
||||
.stabstr 0 : { *(.stabstr) }
|
||||
.stab.excl 0 : { *(.stab.excl) }
|
||||
.stab.exclstr 0 : { *(.stab.exclstr) }
|
||||
.stab.index 0 : { *(.stab.index) }
|
||||
.stab.indexstr 0 : { *(.stab.indexstr) }
|
||||
.comment 0 : { *(.comment) }
|
||||
/* DWARF debug sections.
|
||||
Symbols in the DWARF debugging sections are relative to the beginning
|
||||
of the section so we begin them at 0. */
|
||||
/* DWARF 1 */
|
||||
.debug 0 : { *(.debug) }
|
||||
.line 0 : { *(.line) }
|
||||
/* GNU DWARF 1 extensions */
|
||||
.debug_srcinfo 0 : { *(.debug_srcinfo) }
|
||||
.debug_sfnames 0 : { *(.debug_sfnames) }
|
||||
/* DWARF 1.1 and DWARF 2 */
|
||||
.debug_aranges 0 : { *(.debug_aranges) }
|
||||
.debug_pubnames 0 : { *(.debug_pubnames) }
|
||||
/* DWARF 2 */
|
||||
.debug_info 0 : { *(.debug_info) }
|
||||
.debug_abbrev 0 : { *(.debug_abbrev) }
|
||||
.debug_line 0 : { *(.debug_line) }
|
||||
.debug_frame 0 : { *(.debug_frame) }
|
||||
.debug_str 0 : { *(.debug_str) }
|
||||
.debug_loc 0 : { *(.debug_loc) }
|
||||
.debug_macinfo 0 : { *(.debug_macinfo) }
|
||||
/* SGI/MIPS DWARF 2 extensions */
|
||||
.debug_weaknames 0 : { *(.debug_weaknames) }
|
||||
.debug_funcnames 0 : { *(.debug_funcnames) }
|
||||
.debug_typenames 0 : { *(.debug_typenames) }
|
||||
.debug_varnames 0 : { *(.debug_varnames) }
|
||||
/* These must appear regardless of . */
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user