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List: netbsd-tech-toolchain
Subject: New linker scripts for MULTIPROCESSOR ports
From: Matt Fleming <mjf () NetBSD ! org>
Date: 2009-04-28 11:50:09
Message-ID: 20090428125009.4979e65b.mjf () netbsd ! org
[Download RAW message or body]
Hi all,
I've a need to add some linker scripts to some ports that support MULTIPROCESSOR and \
don't currently use a non-default linker script. The new kernel linker scripts for \
alpha, macppc, powerpc and vax are attached. The linker scripts are a copy of the \
default linker scripts currently used when building the kernel, apart from the two \
new sections I've added:
o .data.cacheline_aligned
o .data.read_mostly
These two new sections are only used when MULTIPROCESSOR is defined. The idea is that \
variables that need to be aligned on cacheline boundaries are placed in the \
.data.cacheline_aligned section, and variables that are infrequently modified are \
placed into the .data.read_mostly section. This helps mitigate false-sharing.
The rest of the patch which actually places variables in the two sections will be \
sent in another mail when it's ready. It's not too far off now.
Can the CC'd port-maintainers please speak up if they have a problem with me \
committing these patches?
["alpha-ldscript.patch" (application/octet-stream)]
Index: sys/arch/alpha/conf/Makefile.alpha
===================================================================
RCS file: /cvsroot/src/sys/arch/alpha/conf/Makefile.alpha,v
retrieving revision 1.81
diff -u -r1.81 Makefile.alpha
--- sys/arch/alpha/conf/Makefile.alpha 11 Dec 2008 05:27:42 -0000 1.81
+++ sys/arch/alpha/conf/Makefile.alpha 25 Apr 2009 10:36:22 -0000
@@ -60,7 +60,8 @@
##
## (5) link settings
##
-LINKFORMAT= -N
+KERN_LDSCRIPT?= kern.ldscript
+LINKFORMAT= -T ${ALPHA}/conf/${KERN_LDSCRIPT}
TEXTADDR?= fffffc0000300000
ENTRYPOINT= __transfer
EXTRA_LINKFLAGS= -G 4
--- /dev/null 2009-04-25 11:25:02.000000000 +0100
+++ sys/arch/alpha/conf/kern.ldscript 2009-04-24 21:46:58.000000000 +0100
@@ -0,0 +1,214 @@
+/* $NetBSD$ */
+/* Script for -N: mix text and data on same page; don't align data */
+OUTPUT_FORMAT("elf64-alpha", "elf64-alpha",
+ "elf64-alpha")
+OUTPUT_ARCH(alpha)
+ENTRY(__start)
+SEARCH_DIR("/usr/lib");
+/* Do we need any of these for elf?
+ __DYNAMIC = 0; */
+SECTIONS
+{
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["macppc-ldscript.patch" (application/octet-stream)]
Index: sys/arch/macppc/conf/Makefile.macppc
===================================================================
RCS file: /cvsroot/src/sys/arch/macppc/conf/Makefile.macppc,v
retrieving revision 1.33
diff -u -r1.33 Makefile.macppc
--- sys/arch/macppc/conf/Makefile.macppc 15 Feb 2009 01:58:01 -0000 1.33
+++ sys/arch/macppc/conf/Makefile.macppc 25 Apr 2009 10:37:41 -0000
@@ -78,7 +78,8 @@
## (5) link settings
##
TEXTADDR?= 0x100000
-LINKFORMAT= -N
+KERN_LDSCRIPT?= kern.ldscript
+LINKFORMAT= -T ${THISPPC}/conf/${KERN_LDSCRIPT}
ENTRYPOINT= __start
.if defined(NEED_SREC)
--- /dev/null 2009-04-25 11:25:02.000000000 +0100
+++ sys/arch/macppc/conf/kern.ldscript 2009-04-24 22:57:07.000000000 +0100
@@ -0,0 +1,220 @@
+/* $NetBSD$ */
+/* Script for -N: mix text and data on same page; don't align data */
+OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc",
+ "elf32-powerpc")
+OUTPUT_ARCH(powerpc:common)
+ENTRY(_start)
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["powerpc-ldscript.patch" (application/octet-stream)]
? sys/arch/powerpc/conf/kern.ldscript
Index: sys/arch/powerpc/conf/Makefile.powerpc
===================================================================
RCS file: /cvsroot/src/sys/arch/powerpc/conf/Makefile.powerpc,v
retrieving revision 1.43
diff -u -r1.43 Makefile.powerpc
--- sys/arch/powerpc/conf/Makefile.powerpc 15 Feb 2009 01:58:01 -0000 1.43
+++ sys/arch/powerpc/conf/Makefile.powerpc 25 Apr 2009 10:44:41 -0000
@@ -73,7 +73,8 @@
## (5) link settings
##
TEXTADDR?= 0x100000
-LINKFORMAT= -N
+KERN_LDSCRIPT?= kern.ldscript
+LINKFORMAT= -T ${POWERPC}/conf/${KERN_LDSCRIPT}
ENTRYPOINT= __start
.if defined(NEED_SREC)
--- /dev/null 2009-04-25 11:40:46.000000000 +0100
+++ sys/arch/powerpc/conf/kern.ldscript 2009-04-24 23:41:15.000000000 +0100
@@ -0,0 +1,220 @@
+/* $NetBSD$ */
+/* Script for -N: mix text and data on same page; don't align data */
+OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc",
+ "elf32-powerpc")
+OUTPUT_ARCH(powerpc:common)
+ENTRY(_start)
+SEARCH_DIR("/usr/lib");
+/* Do we need any of these for elf?
+ __DYNAMIC = 0; */
+PROVIDE (__stack = 0); PROVIDE (___stack = 0);
+SECTIONS
+{
+ /* Read-only sections, merged into text segment: */
+ PROVIDE (__executable_start = 0x01800000); . = 0x01800000 + SIZEOF_HEADERS;
+ .interp : { *(.interp) }
+ .hash : { *(.hash) }
+ .dynsym : { *(.dynsym) }
+ .dynstr : { *(.dynstr) }
+ .gnu.version : { *(.gnu.version) }
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+ .rel.init : { *(.rel.init) }
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+ .rel.text : { *(.rel.text .rel.text.* .rel.gnu.linkonce.t.*) }
+ .rela.text : { *(.rela.text .rela.text.* .rela.gnu.linkonce.t.*) }
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+ .rel.ctors : { *(.rel.ctors) }
+ .rela.ctors : { *(.rela.ctors) }
+ .rel.dtors : { *(.rel.dtors) }
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+ .rel.got : { *(.rel.got) }
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+ .rela.got1 : { *(.rela.got1) }
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+ .rela.sdata : { *(.rela.sdata .rela.sdata.* .rela.gnu.linkonce.s.*) }
+ .rel.sbss : { *(.rel.sbss .rel.sbss.* .rel.gnu.linkonce.sb.*) }
+ .rela.sbss : { *(.rela.sbss .rela.sbss.* .rela.gnu.linkonce.sb.*) }
+ .rel.sdata2 : { *(.rel.sdata2 .rel.sdata2.* .rel.gnu.linkonce.s2.*) }
+ .rela.sdata2 : { *(.rela.sdata2 .rela.sdata2.* .rela.gnu.linkonce.s2.*) }
+ .rel.sbss2 : { *(.rel.sbss2 .rel.sbss2.* .rel.gnu.linkonce.sb2.*) }
+ .rela.sbss2 : { *(.rela.sbss2 .rela.sbss2.* .rela.gnu.linkonce.sb2.*) }
+ .rel.bss : { *(.rel.bss .rel.bss.* .rel.gnu.linkonce.b.*) }
+ .rela.bss : { *(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*) }
+ .rel.plt : { *(.rel.plt) }
+ .rela.plt : { *(.rela.plt) }
+ .init :
+ {
+ KEEP (*(.init))
+ } =0
+ .text :
+ {
+ *(.text .stub .text.* .gnu.linkonce.t.*)
+ KEEP (*(.text.*personality*))
+ /* .gnu.warning sections are handled specially by elf32.em. */
+ *(.gnu.warning)
+ } =0
+ .fini :
+ {
+ KEEP (*(.fini))
+ } =0
+ PROVIDE (__etext = .);
+ PROVIDE (_etext = .);
+ PROVIDE (etext = .);
+ .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
+ .rodata1 : { *(.rodata1) }
+ .sdata2 : { *(.sdata2 .sdata2.* .gnu.linkonce.s2.*) }
+ .sbss2 : { *(.sbss2 .sbss2.* .gnu.linkonce.sb2.*) }
+ .eh_frame_hdr : { *(.eh_frame_hdr) }
+ .eh_frame : ONLY_IF_RO { KEEP (*(.eh_frame)) }
+ .gcc_except_table : ONLY_IF_RO { KEEP (*(.gcc_except_table)) *(.gcc_except_table.*) }
+ /* Adjust the address for the data segment. We want to adjust up to
+ the same address within the page on the next page up. */
+ . = .;
+ /* Exception handling */
+ .eh_frame : ONLY_IF_RW { KEEP (*(.eh_frame)) }
+ .gcc_except_table : ONLY_IF_RW { KEEP (*(.gcc_except_table)) *(.gcc_except_table.*) }
+ /* Thread Local Storage sections */
+ .tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
+ .tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
+ /* Ensure the __preinit_array_start label is properly aligned. We
+ could instead move the label definition inside the section, but
+ the linker would then create the section even if it turns out to
+ be empty, which isn't pretty. */
+ . = ALIGN(32 / 8);
+ PROVIDE (__preinit_array_start = .);
+ .preinit_array : { KEEP (*(.preinit_array)) }
+ PROVIDE (__preinit_array_end = .);
+ PROVIDE (__init_array_start = .);
+ .init_array : { KEEP (*(.init_array)) }
+ PROVIDE (__init_array_end = .);
+ PROVIDE (__fini_array_start = .);
+ .fini_array : { KEEP (*(.fini_array)) }
+ PROVIDE (__fini_array_end = .);
+ .ctors :
+ {
+ /* gcc uses crtbegin.o to find the start of
+ the constructors, so we make sure it is
+ first. Because this is a wildcard, it
+ doesn't matter if the user does not
+ actually link against crtbegin.o; the
+ linker won't look for a file to match a
+ wildcard. The wildcard also means that it
+ doesn't matter which directory crtbegin.o
+ is in. */
+ KEEP (*crtbegin*.o(.ctors))
+ /* We don't want to include the .ctor section from
+ from the crtend.o file until after the sorted ctors.
+ The .ctor section from the crtend file contains the
+ end of ctors marker and it must be last */
+ KEEP (*(EXCLUDE_FILE (*crtend*.o ) .ctors))
+ KEEP (*(SORT(.ctors.*)))
+ KEEP (*(.ctors))
+ }
+ .dtors :
+ {
+ KEEP (*crtbegin*.o(.dtors))
+ KEEP (*(EXCLUDE_FILE (*crtend*.o ) .dtors))
+ KEEP (*(SORT(.dtors.*)))
+ KEEP (*(.dtors))
+ }
+ .jcr : { KEEP (*(.jcr)) }
+ .data.rel.ro : { *(.data.rel.ro.local) *(.data.rel.ro*) }
+ .fixup : { *(.fixup) }
+ .got1 : { *(.got1) }
+ .got2 : { *(.got2) }
+ .dynamic : { *(.dynamic) }
+ .data :
+ {
+ *(.data .gnu.linkonce.d.*)
+ KEEP (*(.gnu.linkonce.d.*personality*))
+ SORT(CONSTRUCTORS)
+ }
+ .data1 : { *(.data1) }
+ . = ALIGN(64); /* COHERENCY_UNIT */
+ .data.cacheline_aligned : { *(.data.cacheline_aligned) }
+ . = ALIGN(64); /* COHERENCY_UNIT */
+ .data.read_mostly : { *(.data.read_mostly) }
+ .got : { *(.got.plt) *(.got) }
+ /* 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 .sdata.* .gnu.linkonce.s.*)
+ }
+ _edata = .;
+ PROVIDE (edata = .);
+ __bss_start = .;
+ .sbss :
+ {
+ PROVIDE (__sbss_start = .);
+ PROVIDE (___sbss_start = .);
+ *(.dynsbss)
+ *(.sbss .sbss.* .gnu.linkonce.sb.*)
+ *(.scommon)
+ PROVIDE (__sbss_end = .);
+ PROVIDE (___sbss_end = .);
+ }
+ .plt : { *(.plt) }
+ .bss :
+ {
+ *(.dynbss)
+ *(.bss .bss.* .gnu.linkonce.b.*)
+ *(COMMON)
+ /* Align here to ensure that the .bss section occupies space up to
+ _end. Align after .bss to ensure correct alignment even if the
+ .bss section disappears because there are no input sections. */
+ . = ALIGN(32 / 8);
+ }
+ . = ALIGN(32 / 8);
+ _end = .;
+ __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 .gnu.linkonce.wi.*) }
+ .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) }
+ /DISCARD/ : { *(.note.GNU-stack) }
+}
["vax-ldscript.patch" (application/octet-stream)]
Index: sys/arch/vax/conf/Makefile.vax
===================================================================
RCS file: /cvsroot/src/sys/arch/vax/conf/Makefile.vax,v
retrieving revision 1.80
diff -u -r1.80 Makefile.vax
--- sys/arch/vax/conf/Makefile.vax 1 Mar 2008 13:59:56 -0000 1.80
+++ sys/arch/vax/conf/Makefile.vax 25 Apr 2009 10:48:23 -0000
@@ -57,7 +57,8 @@
## (5) link settings
##
TEXTADDR?= 80000000
-LINKFORMAT= -N
+KERN_LDSCRIPT?= kern.ldscript
+LINKFORMAT= -T ${VAX}/conf/${KERN_LDSCRIPT}
LINKFLAGS_DEBUG= -X
LINKFLAGS_NORMAL= -S
--- /dev/null 2009-04-25 11:40:46.000000000 +0100
+++ sys/arch/vax/conf/kern.ldscript 2009-04-24 21:34:27.000000000 +0100
@@ -0,0 +1,186 @@
+/* $NetBSD$ */
+/* Script for -N: mix text and data on same page; don't align data */
+OUTPUT_FORMAT("elf32-vax", "elf32-vax",
+ "elf32-vax")
+OUTPUT_ARCH(vax)
+ENTRY(_start)
+SEARCH_DIR("/usr/lib");
+/* Do we need any of these for elf?
+ __DYNAMIC = 0; */
+SECTIONS
+{
+ /* Read-only sections, merged into text segment: */
+ PROVIDE (__executable_start = 0x10000); . = 0x10000 + 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.init : { *(.rel.init) }
+ .rela.init : { *(.rela.init) }
+ .rel.text : { *(.rel.text .rel.text.* .rel.gnu.linkonce.t.*) }
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+ .rela.plt : { *(.rela.plt) }
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+ .text :
+ {
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+ /* Adjust the address for the data segment. We want to adjust up to
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+ /* Exception handling */
+ .eh_frame : ONLY_IF_RW { KEEP (*(.eh_frame)) }
+ .gcc_except_table : ONLY_IF_RW { KEEP (*(.gcc_except_table)) *(.gcc_except_table.*) }
+ /* Thread Local Storage sections */
+ .tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
+ .tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
+ /* Ensure the __preinit_array_start label is properly aligned. We
+ could instead move the label definition inside the section, but
+ the linker would then create the section even if it turns out to
+ be empty, which isn't pretty. */
+ . = ALIGN(32 / 8);
+ PROVIDE (__preinit_array_start = .);
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+ PROVIDE (__preinit_array_end = .);
+ PROVIDE (__init_array_start = .);
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+ /* gcc uses crtbegin.o to find the start of
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+ /* We don't want to include the .ctor section from
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+ The .ctor section from the crtend file contains the
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+ KEEP (*(SORT(.ctors.*)))
+ KEEP (*(.ctors))
+ }
+ .dtors :
+ {
+ KEEP (*crtbegin*.o(.dtors))
+ KEEP (*(EXCLUDE_FILE (*crtend*.o ) .dtors))
+ KEEP (*(SORT(.dtors.*)))
+ KEEP (*(.dtors))
+ }
+ .jcr : { KEEP (*(.jcr)) }
+ .data.rel.ro : { *(.data.rel.ro.local) *(.data.rel.ro*) }
+ .dynamic : { *(.dynamic) }
+ .got : { *(.got.plt) *(.got) }
+ .data :
+ {
+ *(.data .gnu.linkonce.d.*)
+ KEEP (*(.gnu.linkonce.d.*personality*))
+ SORT(CONSTRUCTORS)
+ }
+ .data1 : { *(.data1) }
+ . = ALIGN(64); /* COHERENCY_UNIT */
+ .data.cacheline_aligned : { *(.data.cacheline_aligned) }
+ . = ALIGN(64); /* COHERENCY_UNIT */
+ .data.read_mostly : { *(.data.read_mostly) }
+ _edata = .;
+ PROVIDE (edata = .);
+ __bss_start = .;
+ .bss :
+ {
+ *(.dynbss)
+ *(.bss .bss.* .gnu.linkonce.b.*)
+ *(COMMON)
+ /* Align here to ensure that the .bss section occupies space up to
+ _end. Align after .bss to ensure correct alignment even if the
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+ . = ALIGN(32 / 8);
+ }
+ . = ALIGN(32 / 8);
+ _end = .;
+ PROVIDE (end = .);
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+ /* DWARF debug sections.
+ Symbols in the DWARF debugging sections are relative to the beginning
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+ /* 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 */
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+ .debug_pubnames 0 : { *(.debug_pubnames) }
+ /* DWARF 2 */
+ .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
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+ .debug_loc 0 : { *(.debug_loc) }
+ .debug_macinfo 0 : { *(.debug_macinfo) }
+ /* SGI/MIPS DWARF 2 extensions */
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+ .debug_typenames 0 : { *(.debug_typenames) }
+ .debug_varnames 0 : { *(.debug_varnames) }
+ /DISCARD/ : { *(.note.GNU-stack) }
+}
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