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Message-ID: <20090501213118.GA28126@uranus.ravnborg.org>
Date: Fri, 1 May 2009 23:31:18 +0200
From: Sam Ravnborg <sam@...nborg.org>
To: Tim Abbott <tabbott@....EDU>
Cc: Linux kernel mailing list <linux-kernel@...r.kernel.org>,
linux arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v2 0/6] macros for section name cleanup
Hi Tim.
[cc trimmed so this hits lkml]
I've tried to make the patch to vmlinux.lds.h more complete.
With this patch I managed to achive the following diffstat:
arch/mips/kernel/vmlinux.lds.S | 70 ++----------------
arch/mn10300/kernel/vmlinux.lds.S | 82 +++-------------------
arch/sparc/kernel/vmlinux.lds.S | 82 +++-------------------
include/asm-generic/vmlinux.lds.h | 139 ++++++++++++++++++++++++++++++++++++-
4 files changed, 165 insertions(+), 208 deletions(-)
So with 3 architecture I have more lines deleted than added.
None of these has been build tested but this shows the potential.
Below you will find the *untested* patch for vmlinux.lds.h.
This is the way I want to go where we have more complete
definitions in the shared file and we try to keep the arch
linker scripts to the arch specifc stuff.
This is not a 1:1 replacement for your patches as they touches files
outside vmlinux.lds.h but I concentrated on this single file for now.
Comments welcome!
Sam
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 89853bc..950d0d7 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -116,6 +116,43 @@
FTRACE_EVENTS() \
TRACE_SYSCALLS()
+/*
+ * Data section helpers
+ */
+#define NOSAVE_DATA \
+ . = ALIGN(PAGE_SIZE); \
+ VMLINUX_SYMBOL(__nosave_begin) = .; \
+ *(.data.nosave) \
+ . = ALIGN(PAGE_SIZE); \
+ VMLINUX_SYMBOL(__nosave_end) = .;
+
+#define PAGE_ALIGNED_DATA(page_align) \
+ . = ALIGN((page_align)); \
+ *(.data.page_aligned)
+
+#define READ_MOSTLY_DATA(align) \
+ . = ALIGN((align)); \
+ *(.data.read_mostly)
+
+#define CACHELINE_ALIGNED_DATA(align) \
+ . = ALIGN((align)); \
+ *(.data.cacheline_aligned)
+
+/* use 0 as page_align if page_aligned data is not used */
+#define RW_DATA(page_align, readmostly_align, cache_align) \
+ . = ALIGN(PAGE_SIZE); \
+ .data : AT(ADDR(.data) - LOAD_OFFSET) { \
+ DATA_DATA \
+ CONSTRUCTORS \
+ NOSAVE_DATA \
+ PAGE_ALIGNED_DATA(page_align) \
+ READMOSTLY_DATA((readmostly_align)) \
+ CACHELINE_ALIGNED_DATA((cache_align)) \
+ }
+
+/*
+ * Read only Data
+ */
#define RO_DATA(align) \
. = ALIGN((align)); \
.rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
@@ -274,6 +311,18 @@
* All archs are supposed to use RO_DATA() */
#define RODATA RO_DATA(4096)
+#ifdef CONFIG_BLK_DEV_INITRD
+#define INITRAMFS \
+ . = ALIGN(PAGE_SIZE); \
+ .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__initramfs_start) = .; \
+ *(.init.ramfs) \
+ VMLINUX_SYMBOL(__initramfs_end) = .; \
+ }
+#else
+#define INITRAMFS
+#endif
+
#define SECURITY_INIT \
.security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__security_initcall_start) = .; \
@@ -281,6 +330,24 @@
VMLINUX_SYMBOL(__security_initcall_end) = .; \
}
+#define INITDATA(initsetup_align) \
+ .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
+ INIT_DATA \
+ . = ALIGN(initsetup_align); \
+ VMLINUX_SYMBOL(__setup_start) = .; \
+ *(.init.setup) \
+ VMLINUX_SYMBOL(__setup_end) = .; \
+ VMLINUX_SYMBOL(__initcall_start) = .; \
+ INITCALLS \
+ VMLINUX_SYMBOL(__initcall_end) = .; \
+ VMLINUX_SYMBOL(__con_initcall_start) = .; \
+ *(.con_initcall.init) \
+ VMLINUX_SYMBOL(__con_initcall_end) = .;
+ VMLINUX_SYMBOL(__security_initcall_start) = .; \
+ *(.security_initcall.init) \
+ VMLINUX_SYMBOL(__security_initcall_end) = .; \
+ }
+
/* .text section. Map to function alignment to avoid address changes
* during second ld run in second ld pass when generating System.map */
#define TEXT_TEXT \
@@ -332,6 +399,29 @@
/* Section used for early init (in .S files) */
#define HEAD_TEXT *(HEAD_TEXT_SECTION)
+/*
+ * Exception table
+ */
+#define EXCEPTION_TABLE(align) \
+ . = ALIGN((align)); \
+ __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__start___ex_table) = .; \
+ *(__ex_table) \
+ VMLINUX_SYMBOL(__stop___ex_table) = .; \
+ }
+
+/*
+ * Init task
+ */
+#define INIT_TASK \
+ *(.data.init_task)
+
+#define INIT_TASK_DATA(align) \
+ . = ALIGN((align)); \
+ .data.init_task : { \
+ INIT_TASK \
+ }
+
/* init and exit section handling */
#define INIT_DATA \
*(.init.data) \
@@ -363,9 +453,52 @@
CPU_DISCARD(exit.text) \
MEM_DISCARD(exit.text)
- /* DWARF debug sections.
- Symbols in the DWARF debugging sections are relative to
- the beginning of the section so we begin them at 0. */
+#define INITTEXT(inittext_align) \
+ . = ALIGN((inittext_align)); \
+ .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__init_begin) = .; \
+ VMLINUX_SYMBOL(_sinittext) = .; \
+ INIT_TEXT \
+ VMLINUX_SYMBOL(_einittext) = .; \
+ }
+
+#define INITDATA(initdata_align) \
+ . = ALIGN((initdata_align)); \
+ .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { \
+ INIT_DATA \
+ }
+
+/*
+ * bss
+ */
+#define SBSS(sbss_align) \
+ . = ALIGN((sbss_align)); \
+ .sbss : AT(ADDR(.sbss) - LOAD_OFFSET) { \
+ *(.sbss) \
+ *(.scommon) \
+ }
+
+#define BSS(bss_align) \
+ . = ALIGN((bss_align)); \
+ .bss : AT(ADDR(.bss) - LOAD_OFFSET) { \
+ *(.bss.page_aligned) \
+ *(.dynbss) \
+ *(.bss) \
+ *(COMMON) \
+ }
+
+#define SBSS_BSS(sbss_align, bss_align) \
+ VMLINUX_SYMBOL(__bss_start) = .; \
+ SBSS(sbss_align) \
+ BSS(bss_align) \
+ ALIGN_FUNCTION(); \
+ VMLINUX_SYMBOL(__bss_stop) = .;
+
+/*
+ * DWARF debug sections.
+ * Symbols in the DWARF debugging sections are relative to
+ * the beginning of the section so we begin them at 0.
+ */
#define DWARF_DEBUG \
/* DWARF 1 */ \
.debug 0 : { *(.debug) } \
--
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