2020-06-28 12:18:34 +02:00
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/****************************************************************************
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* libs/libc/machine/arm/gnu_unwind_find_exidx.c
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*
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2021-03-02 15:54:21 +01:00
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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2020-06-28 12:18:34 +02:00
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*
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2021-03-02 15:54:21 +01:00
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* http://www.apache.org/licenses/LICENSE-2.0
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2020-06-28 12:18:34 +02:00
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*
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2021-03-02 15:54:21 +01:00
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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2020-06-28 12:18:34 +02:00
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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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