cf99fb40c9
Squashed commit of the following:
libs/libxx: Fix some confusing in naming. If the directory is called libxx, then the library must be libxx.a (unless perhaps LIBCXX is selected).
libs/: Fix paths in moved library directories.
libs: Brute force move of libc, libnx, and libxx to libs. Cannot yet build it in that configuration.
107 lines
4.5 KiB
C++
107 lines
4.5 KiB
C++
//***************************************************************************
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// libs/libxx/libxx__gnu_unwind_find_exidx.cxx
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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 "libxx__gnu_unwind_find_exidx.hxx"
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//***************************************************************************
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// Pre-processor Definitions
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//***************************************************************************
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//***************************************************************************
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// Private Data
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//***************************************************************************
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//***************************************************************************
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// Operators
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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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extern "C"
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{
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void init_unwind_exidx(Elf32_Addr start, Elf32_Word size)
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{
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__exidx_start_elf = (__EIT_entry *) start;
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__exidx_end_elf = __exidx_start_elf + size;
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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) / sizeof(__EIT_entry);
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return (_Unwind_Ptr) __exidx_start_elf;
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}
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}
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}
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