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Date: Wed, 29 Apr 2009 09:04:14 GMT
From: tip-bot for Sam Ravnborg <sam@...nborg.org>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
torvalds@...ux-foundation.org, sam@...nborg.org, tabbott@....EDU,
tglx@...utronix.de, mingo@...e.hu
Subject: [tip:x86/kbuild] x86, vmlinux.lds: unify .text output sections
Commit-ID: dfc20895d944cfa81d8ff00809b68ecb8f72cbb0
Gitweb: http://git.kernel.org/tip/dfc20895d944cfa81d8ff00809b68ecb8f72cbb0
Author: Sam Ravnborg <sam@...nborg.org>
AuthorDate: Wed, 29 Apr 2009 09:47:21 +0200
Committer: Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 29 Apr 2009 10:20:31 +0200
x86, vmlinux.lds: unify .text output sections
32 bit x86 had a dedicated .text.head output section,
whereas 64 bit had it all in a single output section.
In the unified version the dedicated .text.head output section
was kept to have full control over the head code.
32 bit:
- Moved definition of _stext to the linker script.
The definition is located _after_ .text.page_aligned as this
is what 32 bit did before.
The ALIGN(8) was introduced so we hit the exact same address
(on the tested config) before and after the move.
I assume that it is a bug that _stext did not cover the
.text.page_aligned section - if this is true it can be fixed
in a follow-up patch (and the ugly ALIGN() can be dropped).
[ Impact: 64-bit: cleanup, 32-bit: use the 64-bit linker script ]
Signed-off-by: Sam Ravnborg <sam@...nborg.org>
Cc: Tim Abbott <tabbott@....EDU>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
LKML-Reference: <1240991249-27117-5-git-send-email-sam@...nborg.org>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
arch/x86/kernel/head_32.S | 7 -------
arch/x86/kernel/vmlinux.lds.S | 31 +++++++++++++++++++++++++++++++
arch/x86/kernel/vmlinux_32.lds.S | 24 ------------------------
arch/x86/kernel/vmlinux_64.lds.S | 20 --------------------
4 files changed, 31 insertions(+), 51 deletions(-)
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 3068388..dc5ed4b 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -608,13 +608,6 @@ ignore_int:
ENTRY(initial_code)
.long i386_start_kernel
-.section .text
-/*
- * Real beginning of normal "text" segment
- */
-ENTRY(stext)
-ENTRY(_stext)
-
/*
* BSS section
*/
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 845776f..a7c88bb 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -64,6 +64,37 @@ SECTIONS
phys_startup_64 = startup_64 - LOAD_OFFSET;
#endif
+ /* Text and read-only data */
+
+ /* bootstrapping code */
+ .text.head : AT(ADDR(.text.head) - LOAD_OFFSET) {
+ _text = .;
+ *(.text.head)
+ } :text = 0x9090
+
+ /* The rest of the text */
+ .text : AT(ADDR(.text) - LOAD_OFFSET) {
+#ifdef CONFIG_X86_32
+ /* not really needed, already page aligned */
+ . = ALIGN(PAGE_SIZE);
+ *(.text.page_aligned)
+#endif
+ . = ALIGN(8);
+ _stext = .;
+ TEXT_TEXT
+ SCHED_TEXT
+ LOCK_TEXT
+ KPROBES_TEXT
+ IRQENTRY_TEXT
+ *(.fixup)
+ *(.gnu.warning)
+ /* End of text section */
+ _etext = .;
+ } :text = 0x9090
+
+ NOTES :text :note
+
+
#ifdef CONFIG_X86_32
# include "vmlinux_32.lds.S"
#else
diff --git a/arch/x86/kernel/vmlinux_32.lds.S b/arch/x86/kernel/vmlinux_32.lds.S
index 3d3d49c..8540092 100644
--- a/arch/x86/kernel/vmlinux_32.lds.S
+++ b/arch/x86/kernel/vmlinux_32.lds.S
@@ -1,27 +1,3 @@
- /* Text and read-only data */
- .text.head : AT(ADDR(.text.head) - LOAD_OFFSET) {
- _text = .;
- *(.text.head)
- } :text = 0x9090
-
- /* read-only */
- .text : AT(ADDR(.text) - LOAD_OFFSET) {
- /* not really needed, already page aligned */
- . = ALIGN(PAGE_SIZE);
- *(.text.page_aligned)
- TEXT_TEXT
- SCHED_TEXT
- LOCK_TEXT
- KPROBES_TEXT
- IRQENTRY_TEXT
- *(.fixup)
- *(.gnu.warning)
- /* End of text section */
- _etext = .;
- } :text = 0x9090
-
- NOTES :text :note
-
/* Exception table */
. = ALIGN(16);
__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
diff --git a/arch/x86/kernel/vmlinux_64.lds.S b/arch/x86/kernel/vmlinux_64.lds.S
index 2d7fa20..b5d4367 100644
--- a/arch/x86/kernel/vmlinux_64.lds.S
+++ b/arch/x86/kernel/vmlinux_64.lds.S
@@ -1,23 +1,3 @@
- /* Text and read-only data */
- .text : AT(ADDR(.text) - LOAD_OFFSET) {
- _text = .;
- /* First the code that has to be first for bootstrapping */
- *(.text.head)
- _stext = .;
- /* Then the rest */
- TEXT_TEXT
- SCHED_TEXT
- LOCK_TEXT
- KPROBES_TEXT
- IRQENTRY_TEXT
- *(.fixup)
- *(.gnu.warning)
- /* End of text section */
- _etext = .;
- } :text = 0x9090
-
- NOTES :text :note
-
/* Exception table */
. = ALIGN(16);
__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
--
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