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[ARM] 5383/2: unwind: Add core support for ARM stack unwinding

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This patch adds the main functionality for parsing the stack unwinding
information generated by the ARM EABI toolchains. The unwinding
information consists of an index with a pair of words per function and a
table with unwinding instructions. For more information, see "Exception
Handling ABI for the ARM Architecture" at:

http://infocenter.arm.com/help/topic/com.arm.doc.subset.swdev.abi/index.html

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas
2009-02-16 11:41:36 +01:00
committed by Russell King
parent 2d7c11bfc9
commit bff595c15c
6 changed files with 540 additions and 0 deletions
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19
arch/arm/kernel/vmlinux.lds.S
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@ -80,6 +80,8 @@ SECTIONS
EXIT_TEXT
EXIT_DATA
*(.exitcall.exit)
*(.ARM.exidx.exit.text)
*(.ARM.extab.exit.text)
#ifndef CONFIG_MMU
*(.fixup)
*(__ex_table)
@ -110,6 +112,23 @@ SECTIONS
_etext = .; /* End of text and rodata section */
#ifdef CONFIG_ARM_UNWIND
/*
* Stack unwinding tables
*/
. = ALIGN(8);
.ARM.unwind_idx : {
__start_unwind_idx = .;
*(.ARM.exidx*)
__stop_unwind_idx = .;
}
.ARM.unwind_tab : {
__start_unwind_tab = .;
*(.ARM.extab*)
__stop_unwind_tab = .;
}
#endif
#ifdef CONFIG_XIP_KERNEL
__data_loc = ALIGN(4); /* location in binary */
. = PAGE_OFFSET + TEXT_OFFSET;