linux/arch/parisc/kernel/vmlinux.lds.S
Helge Deller 9372450cc2 parisc: add kernel stack overflow check
Add the CONFIG_DEBUG_STACKOVERFLOW config option to enable checks to
detect kernel stack overflows.

Stack overflows can not be detected reliable since we do not want to
introduce too much overhead.

Instead, during irq processing in do_cpu_irq_mask() we check kernel
stack usage of the interrupted kernel process. Kernel threads can be
easily detected by checking the value of space register 7 (sr7) which
is zero when running inside the kernel.

Since THREAD_SIZE is 16k and PAGE_SIZE is 4k, reduce the alignment of
the init thread to the lower value (PAGE_SIZE) in the kernel
vmlinux.ld.S linker script.

Signed-off-by: Helge Deller <deller@gmx.de>
2013-05-07 21:34:07 +02:00

179 lines
3.8 KiB
ArmAsm

/* Kernel link layout for various "sections"
*
* Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
* Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
* Copyright (C) 2000 John Marvin <jsm at parisc-linux.org>
* Copyright (C) 2000 Michael Ang <mang with subcarrier.org>
* Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org>
* Copyright (C) 2003 James Bottomley <jejb with parisc-linux.org>
* Copyright (C) 2006 Helge Deller <deller@gmx.de>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <asm-generic/vmlinux.lds.h>
/* needed for the processor specific cache alignment size */
#include <asm/cache.h>
#include <asm/page.h>
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>
/* ld script to make hppa Linux kernel */
#ifndef CONFIG_64BIT
OUTPUT_FORMAT("elf32-hppa-linux")
OUTPUT_ARCH(hppa)
#else
OUTPUT_FORMAT("elf64-hppa-linux")
OUTPUT_ARCH(hppa:hppa2.0w)
#endif
ENTRY(_stext)
#ifndef CONFIG_64BIT
jiffies = jiffies_64 + 4;
#else
jiffies = jiffies_64;
#endif
SECTIONS
{
. = KERNEL_BINARY_TEXT_START;
_text = .; /* Text and read-only data */
.head ALIGN(16) : {
HEAD_TEXT
} = 0
.text ALIGN(16) : {
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
KPROBES_TEXT
IRQENTRY_TEXT
*(.text.do_softirq)
*(.text.sys_exit)
*(.text.do_sigaltstack)
*(.text.do_fork)
*(.text.*)
*(.fixup)
*(.lock.text) /* out-of-line lock text */
*(.gnu.warning)
}
/* End of text section */
_etext = .;
/* Start of data section */
_sdata = .;
RODATA
/* writeable */
/* Make sure this is page aligned so
* that we can properly leave these
* as writable
*/
. = ALIGN(PAGE_SIZE);
data_start = .;
/* unwind info */
.PARISC.unwind : {
__start___unwind = .;
*(.PARISC.unwind)
__stop___unwind = .;
}
EXCEPTION_TABLE(16)
NOTES
/* Data */
RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, PAGE_SIZE)
/* PA-RISC locks requires 16-byte alignment */
. = ALIGN(16);
.data..lock_aligned : {
*(.data..lock_aligned)
}
/* End of data section */
_edata = .;
/* BSS */
__bss_start = .;
/* page table entries need to be PAGE_SIZE aligned */
. = ALIGN(PAGE_SIZE);
.data..vmpages : {
*(.data..vm0.pmd)
*(.data..vm0.pgd)
*(.data..vm0.pte)
}
.bss : {
*(.bss)
*(COMMON)
}
__bss_stop = .;
#ifdef CONFIG_64BIT
. = ALIGN(16);
/* Linkage tables */
.opd : {
*(.opd)
} PROVIDE (__gp = .);
.plt : {
*(.plt)
}
.dlt : {
*(.dlt)
}
#endif
/* reserve space for interrupt stack by aligning __init* to 16k */
. = ALIGN(16384);
__init_begin = .;
INIT_TEXT_SECTION(16384)
. = ALIGN(PAGE_SIZE);
INIT_DATA_SECTION(16)
/* we have to discard exit text and such at runtime, not link time */
.exit.text :
{
EXIT_TEXT
}
.exit.data :
{
EXIT_DATA
}
PERCPU_SECTION(L1_CACHE_BYTES)
. = ALIGN(PAGE_SIZE);
__init_end = .;
/* freed after init ends here */
_end = . ;
STABS_DEBUG
.note 0 : { *(.note) }
/* Sections to be discarded */
DISCARDS
/DISCARD/ : {
#ifdef CONFIG_64BIT
/* temporary hack until binutils is fixed to not emit these
* for static binaries
*/
*(.interp)
*(.dynsym)
*(.dynstr)
*(.dynamic)
*(.hash)
*(.gnu.hash)
#endif
}
}