Release 4.7 kernel/extable.c
/* Rewritten by Rusty Russell, on the backs of many others...
Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
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 <linux/ftrace.h>
#include <linux/memory.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/init.h>
#include <asm/sections.h>
#include <asm/uaccess.h>
/*
* mutex protecting text section modification (dynamic code patching).
* some users need to sleep (allocating memory...) while they hold this lock.
*
* NOT exported to modules - patching kernel text is a really delicate matter.
*/
DEFINE_MUTEX(text_mutex);
extern struct exception_table_entry __start___ex_table[];
extern struct exception_table_entry __stop___ex_table[];
/* Cleared by build time tools if the table is already sorted. */
u32 __initdata __visible main_extable_sort_needed = 1;
/* Sort the kernel's built-in exception table */
void __init sort_main_extable(void)
{
if (main_extable_sort_needed && __stop___ex_table > __start___ex_table) {
pr_notice("Sorting __ex_table...\n");
sort_extable(__start___ex_table, __stop___ex_table);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| paul mackerras | paul mackerras | 15 | 50.00% | 1 | 25.00% |
| borislav petkov | borislav petkov | 7 | 23.33% | 1 | 25.00% |
| david daney | david daney | 4 | 13.33% | 1 | 25.00% |
| uwe kleine-koenig | uwe kleine-koenig | 4 | 13.33% | 1 | 25.00% |
| Total | 30 | 100.00% | 4 | 100.00% |
/* Given an address, look for it in the exception tables. */
const struct exception_table_entry *search_exception_tables(unsigned long addr)
{
const struct exception_table_entry *e;
e = search_extable(__start___ex_table, __stop___ex_table-1, addr);
if (!e)
e = search_module_extables(addr);
return e;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| rusty russell | rusty russell | 36 | 78.26% | 2 | 66.67% |
| linus torvalds | linus torvalds | 10 | 21.74% | 1 | 33.33% |
| Total | 46 | 100.00% | 3 | 100.00% |
static inline int init_kernel_text(unsigned long addr)
{
if (addr >= (unsigned long)_sinittext &&
addr < (unsigned long)_einittext)
return 1;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| rusty russell | rusty russell | 25 | 71.43% | 1 | 33.33% |
| ingo molnar | ingo molnar | 9 | 25.71% | 1 | 33.33% |
| helge deller | helge deller | 1 | 2.86% | 1 | 33.33% |
| Total | 35 | 100.00% | 3 | 100.00% |
int core_kernel_text(unsigned long addr)
{
if (addr >= (unsigned long)_stext &&
addr < (unsigned long)_etext)
return 1;
if (system_state == SYSTEM_BOOTING &&
init_kernel_text(addr))
return 1;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 24 | 51.06% | 1 | 20.00% |
| andrew morton | andrew morton | 18 | 38.30% | 1 | 20.00% |
| rusty russell | rusty russell | 4 | 8.51% | 2 | 40.00% |
| helge deller | helge deller | 1 | 2.13% | 1 | 20.00% |
| Total | 47 | 100.00% | 5 | 100.00% |
/**
* core_kernel_data - tell if addr points to kernel data
* @addr: address to test
*
* Returns true if @addr passed in is from the core kernel data
* section.
*
* Note: On some archs it may return true for core RODATA, and false
* for others. But will always be true for core RW data.
*/
int core_kernel_data(unsigned long addr)
{
if (addr >= (unsigned long)_sdata &&
addr < (unsigned long)_edata)
return 1;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| steven rostedt | steven rostedt | 33 | 100.00% | 2 | 100.00% |
| Total | 33 | 100.00% | 2 | 100.00% |
int __kernel_text_address(unsigned long addr)
{
if (core_kernel_text(addr))
return 1;
if (is_module_text_address(addr))
return 1;
if (is_ftrace_trampoline(addr))
return 1;
/*
* There might be init symbols in saved stacktraces.
* Give those symbols a chance to be printed in
* backtraces (such as lockdep traces).
*
* Since we are after the module-symbols check, there's
* no danger of address overlap:
*/
if (init_kernel_text(addr))
return 1;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| rusty russell | rusty russell | 24 | 45.28% | 2 | 50.00% |
| ingo molnar | ingo molnar | 19 | 35.85% | 1 | 25.00% |
| steven rostedt | steven rostedt | 10 | 18.87% | 1 | 25.00% |
| Total | 53 | 100.00% | 4 | 100.00% |
int kernel_text_address(unsigned long addr)
{
if (core_kernel_text(addr))
return 1;
if (is_module_text_address(addr))
return 1;
return is_ftrace_trampoline(addr);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| rusty russell | rusty russell | 24 | 68.57% | 3 | 75.00% |
| steven rostedt | steven rostedt | 11 | 31.43% | 1 | 25.00% |
| Total | 35 | 100.00% | 4 | 100.00% |
/*
* On some architectures (PPC64, IA64) function pointers
* are actually only tokens to some data that then holds the
* real function address. As a result, to find if a function
* pointer is part of the kernel text, we need to do some
* special dereferencing first.
*/
int func_ptr_is_kernel_text(void *ptr)
{
unsigned long addr;
addr = (unsigned long) dereference_function_descriptor(ptr);
if (core_kernel_text(addr))
return 1;
return is_module_text_address(addr);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| arjan van de ven | arjan van de ven | 39 | 97.50% | 1 | 50.00% |
| rusty russell | rusty russell | 1 | 2.50% | 1 | 50.00% |
| Total | 40 | 100.00% | 2 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| rusty russell | rusty russell | 120 | 32.35% | 7 | 30.43% |
| ingo molnar | ingo molnar | 65 | 17.52% | 2 | 8.70% |
| steven rostedt | steven rostedt | 55 | 14.82% | 3 | 13.04% |
| arjan van de ven | arjan van de ven | 40 | 10.78% | 1 | 4.35% |
| linus torvalds | linus torvalds | 25 | 6.74% | 1 | 4.35% |
| andrew morton | andrew morton | 18 | 4.85% | 1 | 4.35% |
| paul mackerras | paul mackerras | 18 | 4.85% | 1 | 4.35% |
| david daney | david daney | 11 | 2.96% | 1 | 4.35% |
| borislav petkov | borislav petkov | 7 | 1.89% | 1 | 4.35% |
| uwe kleine-koenig | uwe kleine-koenig | 4 | 1.08% | 1 | 4.35% |
| frederic weisbecker | frederic weisbecker | 4 | 1.08% | 1 | 4.35% |
| helge deller | helge deller | 2 | 0.54% | 1 | 4.35% |
| dmitri vorobiev | dmitri vorobiev | 1 | 0.27% | 1 | 4.35% |
| andi kleen | andi kleen | 1 | 0.27% | 1 | 4.35% |
| Total | 371 | 100.00% | 23 | 100.00% |
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