90 lines
3.5 KiB
C
90 lines
3.5 KiB
C
/****************************************************************************
|
|
* libs/libc/machine/arm/gnu_unwind_find_exidx.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/elf.h>
|
|
#include <unwind.h>
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
static __EIT_entry *__exidx_start_elf;
|
|
static __EIT_entry *__exidx_end_elf;
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: __gnu_Unwind_Find_exidx
|
|
*
|
|
* Description:
|
|
* This function is called (if exists) by the gcc generated unwind
|
|
* run-time in order to retrieve an alternative .ARM.exidx Exception
|
|
* index section.
|
|
* This is the case for an ELF module loaded by the elf binary loader.
|
|
* It is needed to support exception handling for loadable ELF modules.
|
|
*
|
|
* NOTES:
|
|
*
|
|
* 1. The section to be searched is chosen by the address of the calling
|
|
* site: if we are in a runtime loaded ELF, the code will be executed
|
|
* in ram ( > 0x20000000 ) otherwise we will be executing code from
|
|
* flash (0x08000000) (running nuttx from ram will break this logic)
|
|
*
|
|
* 2. __exidx_start and __exidx_end refers to main nuttx elf image and
|
|
* are defined in its linker script.
|
|
*
|
|
* 2. __exidx_start_elf and __exidx_end_elf refers to the elf module
|
|
* loaded by the elf binary loader, and are initialized at run-time.
|
|
*
|
|
* 3. TODO: if nuttx itself is running from ram, this logic will not work
|
|
*
|
|
* 4. TODO: in order to support multiple elf modules running at the same
|
|
* time, this error logic needs to be extended to store multiple
|
|
* start/end ranges that refers to the loaded binaries.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int up_init_exidx(Elf_Addr start, Elf_Word size)
|
|
{
|
|
__exidx_start_elf = (__EIT_entry *)start;
|
|
__exidx_end_elf = (__EIT_entry *)(start + size);
|
|
return 0;
|
|
}
|
|
|
|
_Unwind_Ptr __gnu_Unwind_Find_exidx(_Unwind_Ptr return_address, int *nrecp)
|
|
{
|
|
if (return_address < 0x20000000)
|
|
{
|
|
*nrecp = __exidx_end - __exidx_start;
|
|
return (_Unwind_Ptr)__exidx_start;
|
|
}
|
|
else
|
|
{
|
|
*nrecp = __exidx_end_elf - __exidx_start_elf;
|
|
return (_Unwind_Ptr)__exidx_start_elf;
|
|
}
|
|
}
|