aa0d57e8ad
because the logic: 1.only work on arm platform 2.couple with elf format Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com> Change-Id: I25dc95b5fc7b24196e2e71fdcf82d71d621ee2d3
122 lines
4.8 KiB
C
122 lines
4.8 KiB
C
/****************************************************************************
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* libs/libc/machine/arm/gnu_unwind_find_exidx.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/elf.h>
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#include <unwind.h>
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/****************************************************************************
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* Private Types
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****************************************************************************/
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typedef struct __EIT_entry
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{
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_uw fnoffset;
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_uw content;
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} __EIT_entry;
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static __EIT_entry *__exidx_start_elf;
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static __EIT_entry *__exidx_end_elf;
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/****************************************************************************
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* Public Data
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****************************************************************************/
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extern __EIT_entry __exidx_start;
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extern __EIT_entry __exidx_end;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: __gnu_Unwind_Find_exidx
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*
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* Description:
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* This function is called (if exists) by the gcc generated unwind
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* run-time in order to retrieve an alternative .ARM.exidx Exception
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* index section.
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* This is the case for an ELF module loaded by the elf binary loader.
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* It is needed to support exception handling for loadable ELF modules.
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*
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* NOTES:
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*
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* 1. The section to be searched is chosen by the address of the calling
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* site: if we are in a runtime loaded ELF, the code will be executed
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* in ram ( > 0x20000000 ) otherwise we will be executing code from
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* flash (0x08000000) (running nuttx from ram will break this logic)
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*
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* 2. __exidx_start and __exidx_end refers to main nuttx elf image and
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* are defined in its linker script.
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*
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* 2. __exidx_start_elf and __exidx_end_elf refers to the elf module
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* loaded by the elf binary loader, and are initialized at run-time.
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*
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* 3. TODO: if nuttx itself is running from ram, this logic will not work
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*
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* 4. TODO: in order to support multiple elf modules running at the same
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* time, this error logic needs to be extended to store multiple
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* start/end ranges that refers to the loaded binaries.
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*
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****************************************************************************/
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int up_init_exidx(Elf_Addr start, Elf_Word size)
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{
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__exidx_start_elf = (__EIT_entry *)start;
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__exidx_end_elf = (__EIT_entry *)(start + size);
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return 0;
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}
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_Unwind_Ptr __gnu_Unwind_Find_exidx(_Unwind_Ptr return_address, int *nrecp)
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{
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if (return_address < 0x20000000)
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{
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*nrecp = &__exidx_end - &__exidx_start;
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return (_Unwind_Ptr)&__exidx_start;
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}
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else
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{
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*nrecp = __exidx_end_elf - __exidx_start_elf;
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return (_Unwind_Ptr)__exidx_start_elf;
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}
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}
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