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Re: Generating DWARF CIE info
- From: Eric Botcazou <ebotcazou at libertysurf dot fr>
- To: Michael Eager <eager at eagercon dot com>
- Cc: gcc at gcc dot gnu dot org
- Date: Sat, 9 Jun 2007 09:57:22 +0200
- Subject: Re: Generating DWARF CIE info
- References: <4669B821.8080404@eagercon.com>
> When I looked at what sparc-gcc was generating for the return
> address column, I discovered that it didn't generate anything.
At least it generates the RA column:
.section ".eh_frame",#alloc,#write
.LLframe1:
.uaword .LLECIE1-.LLSCIE1 ! Length of Common Information Entry
.LLSCIE1:
.uaword 0x0 ! CIE Identifier Tag
.byte 0x1 ! CIE Version
.ascii "\0" ! CIE Augmentation
.byte 0x1 ! uleb128 0x1; CIE Code Alignment Factor
.byte 0x7c ! sleb128 -4; CIE Data Alignment Factor
.byte 0xf ! CIE RA Column
.byte 0xc ! DW_CFA_def_cfa
.byte 0xe ! uleb128 0xe
.byte 0x0 ! uleb128 0x0
> Is there any reason to discard it?
It's supposed to be a constant offset.
-- Macro: RETURN_ADDR_OFFSET
If defined, an integer-valued C expression for which rtl will be
generated to add it to the exception handler address before it is
searched in the exception handling tables, and to subtract it
again from the address before using it to return to the exception
handler.
See the expansion of __builtin_extract_return_addr in except.c.
--
Eric Botcazou