From: Jan Beulich <jbeulich@suse.com>
To: Indu Bhagat <indu.bhagat@oracle.com>
Cc: binutils@sourceware.org
Subject: Re: [PATCH,V1 00/14] Definition and support for SFrame unwind format
Date: Fri, 30 Sep 2022 10:09:23 +0200 [thread overview]
Message-ID: <ef8a4579-50b1-b2e9-f54b-11656db92bc1@suse.com> (raw)
In-Reply-To: <20220930000440.1672106-1-indu.bhagat@oracle.com>
On 30.09.2022 02:04, Indu Bhagat via Binutils wrote:
> What is SFrame format and why do we need it
> -------------------------------------------
> SFrame format is the Simple Frame format. It can be used to represent the
> minimal necessary information for backtracing. As such, it only encodes how to
> recover the CFA (based on SP/FP) and the return address (RA) for all
> instructions of a program.
>
> The format is supported on AMD64 and AARCH64 ABIs only. The information stored
> in the .sframe section is a subset of what .eh_frame can convey: .eh_frame can
> convey how to resurrect all callee-saved registers, if need be; but .sframe
> does not.
I expect the question was asked before, but since the summary here doesn't
answer it: What about cases where the return address is stored in a
callee-saved register? You won't be able to determine its value if that
wasn't the leaf-most function in the active call chain and some inner
function saved and then modified that (presumably) GPR. The same would
likely apply if the return address was saved to some secondary stack.
Jan
next prev parent reply other threads:[~2022-09-30 8:09 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-02 8:04 [PATCH,V6 00/10] Definition and Implementation of CTF Frame format Indu Bhagat
2022-08-02 8:04 ` [PATCH,V6 01/10] ctf-frame.h: Add CTF Frame format definition Indu Bhagat
2022-08-15 12:04 ` Nick Clifton
2022-08-02 8:04 ` [PATCH,V6 02/10] gas: add new command line option --gctf-frame Indu Bhagat
2022-08-15 12:07 ` Nick Clifton
2022-08-02 8:04 ` [PATCH,V6 03/10] gas: generate .ctf_frame Indu Bhagat
2022-08-15 12:22 ` Nick Clifton
2022-08-02 8:04 ` [PATCH,V6 04/10] libctfframe: add the CTF Frame library Indu Bhagat
2022-08-15 12:46 ` Nick Clifton
2022-08-02 8:04 ` [PATCH,V6 05/10] libctfframe: add GNU poke pickles for CTF Frame Indu Bhagat
2022-08-15 12:50 ` Nick Clifton
2022-08-02 8:04 ` [PATCH,V6 06/10] bfd: linker: merge .ctf_frame sections Indu Bhagat
2022-08-15 13:02 ` Nick Clifton
2022-08-18 2:11 ` Indu Bhagat
2022-08-02 8:04 ` [PATCH,V6 07/10] readelf/objdump: support for CTF Frame section Indu Bhagat
2022-08-15 13:11 ` Nick Clifton
2022-08-02 8:04 ` [PATCH,V6 08/10] unwinder: generate backtrace using CTF Frame format Indu Bhagat
2022-08-15 13:16 ` Nick Clifton
2022-08-02 8:04 ` [PATCH,V6 09/10] unwinder: Add CTF Frame unwinder tests Indu Bhagat
2022-08-15 13:27 ` Nick Clifton
2022-08-02 8:04 ` [PATCH, V6 10/10] gdb: sim: buildsystem changes to accommodate libctfframe Indu Bhagat
2022-08-05 14:43 ` Tom Tromey
2022-08-15 12:18 ` [PATCH,V6 00/10] Definition and Implementation of CTF Frame format Nick Clifton
2022-08-18 1:38 ` Indu Bhagat
2022-08-15 14:25 ` Nick Clifton
2022-09-30 0:04 ` [PATCH,V1 00/14] Definition and support for SFrame unwind format Indu Bhagat
2022-09-30 0:04 ` [PATCH,V1 01/14] sframe.h: Add SFrame format definition Indu Bhagat
2022-09-30 0:04 ` [PATCH,V1 02/14] gas: add new command line option --gsframe Indu Bhagat
2022-09-30 0:04 ` [PATCH,V1 03/14] gas: generate .sframe from CFI directives Indu Bhagat
2022-09-30 0:04 ` [PATCH,V1 04/14] gas: testsuite: add new tests for SFrame unwind info Indu Bhagat
2022-09-30 0:04 ` [PATCH,V1 05/14] libsframe: add the SFrame library Indu Bhagat
2022-09-30 0:04 ` [PATCH,V1 06/14] bfd: linker: merge .sframe sections Indu Bhagat
2022-09-30 10:51 ` Nick Clifton
2022-09-30 0:04 ` [PATCH,V1 07/14] readelf/objdump: support for SFrame section Indu Bhagat
2022-09-30 11:08 ` Nick Clifton
2022-09-30 0:04 ` [PATCH,V1 08/14] unwinder: generate backtrace using SFrame format Indu Bhagat
2022-09-30 0:04 ` [PATCH,V1 09/14] unwinder: Add SFrame unwinder tests Indu Bhagat
2022-09-30 0:04 ` [PATCH,V1 10/14] gdb: sim: buildsystem changes to accommodate libsframe Indu Bhagat
2022-10-11 16:08 ` [PATCH, V1 " Tom Tromey
2022-09-30 0:04 ` [PATCH,V1 11/14] libctf: add libsframe to LDFLAGS and LIBS Indu Bhagat
2022-09-30 0:04 ` [PATCH,V1 12/14] src-release.sh: Add libsframe Indu Bhagat
2022-09-30 0:04 ` [PATCH,V1 13/14] binutils/NEWS: add text for SFrame support Indu Bhagat
2022-09-30 0:04 ` [PATCH,V1 14/14] gas/NEWS: add text about new command line option and " Indu Bhagat
2022-09-30 8:09 ` Jan Beulich [this message]
2022-10-04 5:16 ` [PATCH,V1 00/14] Definition and support for SFrame unwind format Indu Bhagat
2022-10-04 6:53 ` Jan Beulich
2022-09-30 8:24 ` Fangrui Song
2022-10-01 0:15 ` Indu Bhagat
2022-09-30 9:12 ` Nick Clifton
2022-10-01 0:29 ` Indu Bhagat
2022-10-01 9:51 ` Jose E. Marchesi
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