linux-kernel - [PATCH 2.6.19] m32r: Fix kernel entry address of vmlinux

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Date:	Thu, 14 Dec 2006 18:40:26 +0900
From:	Hirokazu Takata <takata@...ux-m32r.org>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel@...r.kernel.org, takata@...ux-m32r.org
Subject: [PATCH 2.6.19] m32r: Fix kernel entry address of vmlinux

This patch fixes the kernel entry point address of vmlinux.

The m32r kernel entry address is 0x08002000 (physical).
But, so far, the ENTRY point written in vmlinux.lds.S was not point
the correct kernel entry address.

(before fix)
    $ objdump -x vmlinux
    vmlinux:     file format elf32-m32r-linux
    vmlinux
    architecture: m32r2, flags 0x00000112:
    EXEC_P, HAS_SYMS, D_PAGED
    start address 0x88002090	/* NG */
        :
    Sections:
    Idx Name          Size      VMA       LMA       File off  Algn
      0 .empty_zero_page 00001000  88001000  88001000  00001000  2**12
                      CONTENTS, ALLOC, LOAD, DATA
      1 .boot         0000008c  88002000  88002000  00002000  2**2
                      CONTENTS, ALLOC, LOAD, READONLY, CODE
      2 .text         001ab694  88002090  88002090  00002090  2**4
                      CONTENTS, ALLOC, LOAD, READONLY, CODE
        :

(after fix)
    $ objdump -x vmlinux
    vmlinux:     file format elf32-m32r-linux
    vmlinux
    architecture: m32r2, flags 0x00000112:
    EXEC_P, HAS_SYMS, D_PAGED
    start address 0x08002000	/* OK */
        :

This fix also remedies the following GDB error message (of gdb-6.4 or after)
at the first operation of kernel debugging:
"Previous frame identical to this frame (corrupt stack?)".

Signed-off-by: Hirokazu Takata <takata@...ux-m32r.org>
---
 arch/m32r/Makefile             |    2 +-
 arch/m32r/kernel/vmlinux.lds.S |    5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/m32r/Makefile b/arch/m32r/Makefile
index f219c47..cdf63b2 100644
--- a/arch/m32r/Makefile
+++ b/arch/m32r/Makefile
@@ -7,7 +7,7 @@
 
 LDFLAGS		:=
 OBJCOPYFLAGS	:= -O binary -R .note -R .comment -S
-LDFLAGS_vmlinux	:= -e startup_32
+LDFLAGS_vmlinux	:=
 
 CFLAGS += -pipe -fno-schedule-insns
 CFLAGS_KERNEL += -mmodel=medium
diff --git a/arch/m32r/kernel/vmlinux.lds.S b/arch/m32r/kernel/vmlinux.lds.S
index 358b9ce..c497a2f 100644
--- a/arch/m32r/kernel/vmlinux.lds.S
+++ b/arch/m32r/kernel/vmlinux.lds.S
@@ -6,12 +6,15 @@
 #include <asm/page.h>
 
 OUTPUT_ARCH(m32r)
-ENTRY(startup_32)
 #if defined(__LITTLE_ENDIAN__)
        jiffies = jiffies_64;
 #else
        jiffies = jiffies_64 + 4;
 #endif
+
+kernel_entry = boot - 0x80000000;
+ENTRY(kernel_entry)
+
 SECTIONS
 {
   . = CONFIG_MEMORY_START + __PAGE_OFFSET;
-- 
1.4.4.2

--
Hirokazu Takata <takata@...ux-m32r.org>
Linux/M32R Project:  http://www.linux-m32r.org/
-
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