linux_dsm_epyc7002/arch/tile/lib/exports.c
Chris Metcalf 47ad7b9bbe tile: improve stack backtrace
This commit fixes a number of issues with the tile backtrace code.

- Don't try to identify userspace shared object or executable paths
  if we are doing a backtrace from an interrupt; it's not legal,
  and also unlikely to be interesting.  Likewise, don't try to do
  it for other address spaces, since d_path() assumes it is being
  called in "current" context.

- Move "in_backtrace" from thread_struct to thread_info.
  This way we can access it even if our stack thread_info has been
  clobbered, which makes backtracing more robust.

- Avoid using "current" directly when testing for is_sigreturn().
  Since "current" may be corrupt, we're better off using kbt->task
  explicitly to look up the vdso_base for the current task.
  Conveniently, this simplifies the internal APIs (we only need
  one is_sigreturn() function now).

- Avoid bogus "Odd fault" warning when pc/sp/ex1 are all zero,
  as is true for kernel threads above the last frame.

- Hook into Tejun Heo's dump_stack() framework in lib/dump_stack.c.

- Write last entry in save_stack_trace() as ULONG_MAX, not zero,
  since ftrace (at least) relies on finding that marker.

- Implement save_stack_trace_regs() and save_strack_trace_user(),
  and set CONFIG_USER_STACKTRACE_SUPPORT.

Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
2015-05-11 11:22:40 -04:00

92 lines
2.7 KiB
C

/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* 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, version 2.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*
* Exports from assembler code and from libtile-cc.
*/
#include <linux/module.h>
/* arch/tile/lib/usercopy.S */
#include <linux/uaccess.h>
EXPORT_SYMBOL(clear_user_asm);
EXPORT_SYMBOL(flush_user_asm);
EXPORT_SYMBOL(finv_user_asm);
/* arch/tile/kernel/entry.S */
#include <linux/kernel.h>
#include <asm/processor.h>
EXPORT_SYMBOL(current_text_addr);
/* arch/tile/kernel/head.S */
EXPORT_SYMBOL(empty_zero_page);
#ifdef CONFIG_FUNCTION_TRACER
/* arch/tile/kernel/mcount_64.S */
#include <asm/ftrace.h>
EXPORT_SYMBOL(__mcount);
#endif /* CONFIG_FUNCTION_TRACER */
/* arch/tile/lib/, various memcpy files */
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(__copy_to_user_inatomic);
EXPORT_SYMBOL(__copy_from_user_inatomic);
EXPORT_SYMBOL(__copy_from_user_zeroing);
#ifdef __tilegx__
EXPORT_SYMBOL(__copy_in_user_inatomic);
#endif
/* hypervisor glue */
#include <hv/hypervisor.h>
EXPORT_SYMBOL(hv_dev_open);
EXPORT_SYMBOL(hv_dev_pread);
EXPORT_SYMBOL(hv_dev_pwrite);
EXPORT_SYMBOL(hv_dev_preada);
EXPORT_SYMBOL(hv_dev_pwritea);
EXPORT_SYMBOL(hv_dev_poll);
EXPORT_SYMBOL(hv_dev_poll_cancel);
EXPORT_SYMBOL(hv_dev_close);
EXPORT_SYMBOL(hv_sysconf);
EXPORT_SYMBOL(hv_confstr);
EXPORT_SYMBOL(hv_get_rtc);
EXPORT_SYMBOL(hv_set_rtc);
/* libgcc.a */
uint32_t __udivsi3(uint32_t dividend, uint32_t divisor);
EXPORT_SYMBOL(__udivsi3);
int32_t __divsi3(int32_t dividend, int32_t divisor);
EXPORT_SYMBOL(__divsi3);
uint64_t __udivdi3(uint64_t dividend, uint64_t divisor);
EXPORT_SYMBOL(__udivdi3);
int64_t __divdi3(int64_t dividend, int64_t divisor);
EXPORT_SYMBOL(__divdi3);
uint32_t __umodsi3(uint32_t dividend, uint32_t divisor);
EXPORT_SYMBOL(__umodsi3);
int32_t __modsi3(int32_t dividend, int32_t divisor);
EXPORT_SYMBOL(__modsi3);
uint64_t __umoddi3(uint64_t dividend, uint64_t divisor);
EXPORT_SYMBOL(__umoddi3);
int64_t __moddi3(int64_t dividend, int64_t divisor);
EXPORT_SYMBOL(__moddi3);
#ifndef __tilegx__
int64_t __muldi3(int64_t, int64_t);
EXPORT_SYMBOL(__muldi3);
uint64_t __lshrdi3(uint64_t, unsigned int);
EXPORT_SYMBOL(__lshrdi3);
uint64_t __ashrdi3(uint64_t, unsigned int);
EXPORT_SYMBOL(__ashrdi3);
uint64_t __ashldi3(uint64_t, unsigned int);
EXPORT_SYMBOL(__ashldi3);
int __ffsdi2(uint64_t);
EXPORT_SYMBOL(__ffsdi2);
#endif