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ARC: dw2 unwind: switch to .eh_frame based unwinding

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So finally after almost 8 years of dealing with .debug_frame, we are
finally switching to .eh_frame. The reason being stripped kernel
binaries had non-functional unwinder as .debug_frame was gone.
Also, in general .eh_frame seems more common way of doing unwinding.

This also folds a revert of f52e126cc7 ("ARC: unwind: ensure that
.debug_frame is generated (vs. .eh_frame)") to ensure that we start
getting .eh_frame

Reported-by: Daniel Mentz <danielmentz@google.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta
2013-06-24 21:22:06 +05:30
parent d040876b4a
commit 6716dbbdef
5 changed files with 13 additions and 34 deletions
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15
arch/arc/kernel/vmlinux.lds.S
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@@ -84,7 +84,7 @@ SECTIONS
/*
* .exit.text is discard at runtime, not link time, to deal with
* references from .debug_frame
* references from unwinding sections
* It will be init freed, being inside [__init_start : __init_end]
*/
.exit.text : { EXIT_TEXT }
@@ -120,18 +120,13 @@ SECTIONS
#ifdef CONFIG_ARC_DW2_UNWIND
. = ALIGN(PAGE_SIZE);
.debug_frame : {
.eh_frame : {
__start_unwind = .;
*(.debug_frame)
*(.eh_frame)
__end_unwind = .;
}
/*
* gcc 4.8 generates this for -fasynchonous-unwind-tables,
* while we still use the .debug_frame based unwinder
*/
/DISCARD/ : { *(.eh_frame) }
#else
/DISCARD/ : { *(.debug_frame) }
/DISCARD/ : { *(.eh_frame) }
#endif
NOTES
@@ -148,7 +143,7 @@ SECTIONS
}
#ifndef CONFIG_DEBUG_INFO
/* open-coded because we need .debug_frame seperately for unwinding */
/DISCARD/ : { *(.debug_frame) }
/DISCARD/ : { *(.debug_aranges) }
/DISCARD/ : { *(.debug_pubnames) }
/DISCARD/ : { *(.debug_info) }