From: John Baldwin <jhb@FreeBSD.org>
To: Keith Seitz <keiths@redhat.com>, gdb-patches@sourceware.org
Subject: Re: [PATCH v6 00/15] Handle variable XSAVE layouts
Date: Fri, 28 Jul 2023 09:35:07 -0700 [thread overview]
Message-ID: <64d96046-eb5a-8f87-6cfc-3299f0fe9a1f@FreeBSD.org> (raw)
In-Reply-To: <34d98a02-e5ad-5358-ed1c-659144ab5bf1@redhat.com>
On 7/27/23 2:36 PM, Keith Seitz wrote:
> On 7/26/23 15:31, John Baldwin wrote:
>>
>> So I have a couple of things to try here. First, a simple fix for the crash
>> is this change (relative to the branch), but it does mean the core dumps generated
>> by gcore for a remote target will not contain extended XSAVE state like AVX, etc.:
>>
>> diff --git a/gdb/i386-linux-tdep.c b/gdb/i386-linux-tdep.c
>> index c8b467a0416..a7d61f33a08 100644
>> --- a/gdb/i386-linux-tdep.c
>> +++ b/gdb/i386-linux-tdep.c
>> @@ -768,7 +768,7 @@ i386_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
>>
>> cb (".reg", 68, 68, &i386_gregset, NULL, cb_data);
>>
>> - if (tdep->xcr0 & X86_XSTATE_AVX)
>> + if (tdep->xsave_layout.sizeof_xsave != 0)
>> cb (".reg-xstate", tdep->xsave_layout.sizeof_xsave,
>> tdep->xsave_layout.sizeof_xsave, &i386_linux_xstateregset,
>> "XSAVE extended state", cb_data);
>>
>> Arguably that is more correct as it lines up with the way the rest of the x86 arches
>> in this series.
>
> Yeah, that does fix a lot of problems. In the vein of "perfect is the enemy of good,"
> this LGTM.
Ok.
>> The other change I have locally is one to generate a "fallback" layout to use in
>> this case that a target (such as remote) doesn't provide a layout.
>
>>
>> The fallback change:
> [snip]
>
> This causes a new regression in gdb.base/solib-display.exp:
>
> # make check RUNTESTFLAGS="--target_board native-extended-gdbserver.exp" \
> TESTS=gdb.base/solib-display.exp
> Running /root/fsf/linux/gdb/testsuite/../../../src/gdb/testsuite/gdb.base/solib-display.exp ...
> FAIL: gdb.base/solib-display.exp: NO: continue two
> FAIL: gdb.base/solib-display.exp: IN: continue two
> FAIL: gdb.base/solib-display.exp: SEP: continue two
>
> === gdb Summary ===
>
> # of expected passes 32
> # of unexpected failures 3
>
> The issue is the same with all three failing tests (-m32/-m64 don't matter).
> With this tweak, we now see:
>
> warning: Unable to display "a_local": No symbol "a_local" in current context.
> warning: Unable to display "a_static": No symbol "a_static" in current context.
>
> This disables the display of the two variables, and they are omitted from
> subsequent displays. [This happens on every x86_64 on which I've tested: Comet Lake,
> Raptor Lake, and Sapphire Rapids.]
Humm, ok. I should be able to look at this locally in a x86-64 VM I have.
I'm inclined to probably leave this off the series though for now while I
figure out the right solution to gcore of a remote process.
--
John Baldwin
prev parent reply other threads:[~2023-07-28 16:35 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-14 15:51 John Baldwin
2023-07-14 15:51 ` [PATCH v6 01/15] x86: Add an x86_xsave_layout structure to handle " John Baldwin
2023-07-26 19:22 ` Simon Marchi
2023-07-26 21:27 ` John Baldwin
2023-07-26 22:51 ` Simon Marchi
2023-07-14 15:51 ` [PATCH v6 02/15] gdb: Store an x86_xsave_layout in i386_gdbarch_tdep John Baldwin
2023-07-14 15:51 ` [PATCH v6 03/15] core: Support fetching x86 XSAVE layout from architectures John Baldwin
2023-07-26 19:37 ` Simon Marchi
2023-07-26 21:28 ` John Baldwin
2023-07-14 15:51 ` [PATCH v6 04/15] nat/x86-cpuid.h: Add x86_cpuid_count wrapper around __get_cpuid_count John Baldwin
2023-07-26 19:41 ` Simon Marchi
2023-07-14 15:51 ` [PATCH v6 05/15] x86 nat: Add helper functions to save the XSAVE layout for the host John Baldwin
2023-07-26 19:48 ` Simon Marchi
2023-07-26 21:37 ` John Baldwin
2023-07-14 15:51 ` [PATCH v6 06/15] gdb: Update x86 FreeBSD architectures to support XSAVE layouts John Baldwin
2023-07-26 20:04 ` Simon Marchi
2023-07-26 21:43 ` John Baldwin
2023-07-28 21:23 ` [PATCH v6a " John Baldwin
2023-08-28 16:01 ` Simon Marchi
2023-07-14 15:51 ` [PATCH v6 07/15] gdb: Support XSAVE layouts for the current host in the FreeBSD x86 targets John Baldwin
2023-07-26 20:26 ` Simon Marchi
2023-07-14 15:51 ` [PATCH v6 08/15] gdb: Update x86 Linux architectures to support XSAVE layouts John Baldwin
2023-07-26 20:45 ` Simon Marchi
2023-07-26 21:16 ` John Baldwin
2023-07-27 21:48 ` Simon Marchi
2023-07-28 16:30 ` John Baldwin
2023-07-28 17:58 ` Simon Marchi
2023-07-28 21:30 ` John Baldwin
2023-07-28 21:29 ` [PATCH v6a " John Baldwin
2023-08-14 17:52 ` John Baldwin
2023-08-28 16:21 ` Simon Marchi
2023-07-14 15:51 ` [PATCH v6 09/15] gdb: Support XSAVE layouts for the current host in the Linux x86 targets John Baldwin
2023-07-26 20:51 ` Simon Marchi
2023-07-14 15:51 ` [PATCH v6 10/15] gdb: Use x86_xstate_layout to parse the XSAVE extended state area John Baldwin
2023-08-28 16:34 ` Simon Marchi
2023-07-14 15:51 ` [PATCH v6 11/15] gdbserver: Add a function to set the XSAVE mask and size John Baldwin
2023-08-28 16:46 ` Simon Marchi
2023-07-14 15:51 ` [PATCH v6 12/15] gdbserver: Refactor the legacy region within the xsave struct John Baldwin
2023-08-28 16:50 ` Simon Marchi
2023-08-28 17:32 ` John Baldwin
2023-07-14 15:51 ` [PATCH v6 13/15] gdbserver: Use x86_xstate_layout to parse the XSAVE extended state area John Baldwin
2023-08-28 18:15 ` Simon Marchi
2023-08-28 18:37 ` John Baldwin
2023-07-14 15:51 ` [PATCH v6 14/15] x86: Remove X86_XSTATE_SIZE and related constants John Baldwin
2023-08-28 20:38 ` Simon Marchi
2023-07-14 15:51 ` [PATCH v6 15/15] gdbserver: Simplify handling of ZMM registers John Baldwin
2023-08-28 20:57 ` Simon Marchi
2023-07-14 15:58 ` [PATCH v6 00/15] Handle variable XSAVE layouts John Baldwin
2023-07-26 8:31 ` Willgerodt, Felix
2023-07-25 17:17 ` Keith Seitz
2023-07-25 18:15 ` John Baldwin
2023-07-25 18:43 ` Keith Seitz
2023-07-25 18:59 ` John Baldwin
2023-07-25 20:42 ` Keith Seitz
2023-07-25 22:05 ` John Baldwin
2023-07-26 22:31 ` John Baldwin
2023-07-27 21:36 ` Keith Seitz
2023-07-28 16:35 ` John Baldwin [this message]
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