From: Andrew Burgess <aburgess@redhat.com>
To: Pedro Alves <pedro@palves.net>, gdb-patches@sourceware.org
Subject: Re: [PATCHv3 6/6] gdb: native target invalid architecture detection
Date: Mon, 11 Jul 2022 11:47:33 +0100 [thread overview]
Message-ID: <87mtdgsz7e.fsf@redhat.com> (raw)
In-Reply-To: <0b9bee5a-d2c6-33f6-c3b9-67b9457add22@palves.net>
Pedro Alves <pedro@palves.net> writes:
> On 2022-06-30 10:33, Andrew Burgess wrote:
>> Pedro Alves <pedro@palves.net> writes:
>>
>>> On 2022-06-27 17:27, Andrew Burgess wrote:
>>>> Pedro Alves <pedro@palves.net> writes:
>>>>> On 2022-06-13 17:15, Andrew Burgess via Gdb-patches wrote:
>>>>> I have another question. I'm confused on how if e.g., on x86-64, you
>>>>> load a RISC-V binary into GDB, and the try to run it, we don't end up
>>>>> with architecture of the target description instead.
>>>>
>>>> The problem is that we end up trying to read the registers before we
>>>> read the target description. Which I suspect you will say sounds wrong,
>>>> and I agree.
>>>>
>
> ...
>
>>> Attaching will need some other fix, because in that case, the procedure is that the core
>>> requests an attach, and then the target reports an initial stop, and that stop
>>> makes infrun read the thread's PC, before setup_inferior is called. It may be
>>> we need to call setup_inferior earlier. Or maybe we can just add a target_find_description
>>> call in linux_nat_target::attach, like remote.c does:
>>>
>>> void
>>> extended_remote_target::attach (const char *args, int from_tty)
>>> {
>>> ...
>>> /* Next, if the target can specify a description, read it. We do
>>> this before anything involving memory or registers. */
>>> target_find_description ();
>>>
>>> I haven't looked at that in much detail, and I have to leave for tonight.
>>
>> How about the patch below to solve the attach case?
>
> I think this should be two patches. The part about picking the architecture
> of the target isn't specific to attaching. We're counting on it for "run" too.
>
>> No test as I don't know how I can reliably compile a binary for a
>> different architecture as part of the testsuite.
>
> We don't even need a binary to trigger badness. Just need to manually
> specify an incompatible architecture, with "set architecture", and
> then "run".
Thanks, I'll work on splitting this patch, and repost.
Andrew
> Like, with current master:
>
> $ gdb -ex "set architecture riscv" ~/gdb/tests/main
> GNU gdb (GDB) 13.0.50.20220630-git
> ...
> Reading symbols from /home/pedro/gdb/tests/main...
> The target architecture is set to "riscv".
> (gdb) r
> Starting program: /pedro/gdb/tests/main
> warning: Selected architecture riscv is not compatible with reported target architecture i386:x86-64
> warning: Architecture rejected target-supplied description
> ../../src/gdb/i387-tdep.c:957: internal-error: i387_supply_xsave: Assertion `tdep->st0_regnum >= I386_ST0_REGNUM' failed.
> A problem internal to GDB has been detected,
> further debugging may prove unreliable.
> ----- Backtrace -----
> 0x556325d5365b gdb_internal_backtrace_1
> ../../src/gdb/bt-utils.c:122
> 0x556325d53714 _Z22gdb_internal_backtracev
> ../../src/gdb/bt-utils.c:168
> ...
>
> A slight difference here compared to actually having a binary of the wrong arch,
> is that this isn't "set architecture auto", so by making choose_architecture_for_target
> chose the target architecture, we'd be overriding the explicit user selection. Maybe
> that's OK, not sure. Maybe the right thing to do in that case (when arch is not auto)
> is to error out (and kill/detach the inferior) instead of warning.
next prev parent reply other threads:[~2022-07-11 10:47 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-31 14:30 [PATCH 0/5] Handle trying to use a native target with the wrong binary Andrew Burgess
2022-05-31 14:30 ` [PATCH 1/5] gdb/arm: move fetch of arm_gdbarch_tdep to a more inner scope Andrew Burgess
2022-06-01 7:58 ` Luis Machado
2022-05-31 14:30 ` [PATCH 2/5] gdb/mips: rewrite show_mask_address Andrew Burgess
2022-05-31 14:30 ` [PATCH 3/5] gdb: move the type cast into gdbarch_tdep Andrew Burgess
2022-06-01 8:01 ` Luis Machado
2022-05-31 14:30 ` [PATCH 4/5] gdb: ensure the cast in gdbarch_tdep is valid Andrew Burgess
2022-05-31 16:04 ` John Baldwin
2022-05-31 17:22 ` Andrew Burgess
2022-05-31 14:30 ` [PATCH 5/5] gdb: native target invalid architecture detection Andrew Burgess
2022-05-31 16:08 ` John Baldwin
2022-05-31 16:51 ` Andrew Burgess
2022-06-01 8:25 ` Luis Machado
2022-06-01 21:06 ` John Baldwin
2022-06-01 21:21 ` Christophe Lyon
2022-06-02 14:56 ` John Baldwin
2022-06-06 14:38 ` Andrew Burgess
2022-06-06 17:48 ` Andrew Burgess
2022-06-07 11:03 ` Luis Machado
2022-06-07 18:42 ` Pedro Alves
2022-06-07 20:15 ` Pedro Alves
2022-06-08 8:18 ` Luis Machado
2022-06-08 10:17 ` Pedro Alves
2022-06-08 7:54 ` Luis Machado
2022-06-08 10:12 ` Pedro Alves
2022-06-08 11:20 ` [PATCH v2] aarch64: Add fallback if ARM_CC_FOR_TARGET not set (was: Re: [PATCH 5/5] gdb: native target invalid architecture detection) Pedro Alves
2022-06-08 12:50 ` Luis Machado
2022-06-08 13:23 ` Pedro Alves
2022-06-08 13:38 ` Andrew Burgess
2022-06-08 19:01 ` John Baldwin
2022-06-08 21:48 ` Pedro Alves
2022-06-09 16:31 ` John Baldwin
2022-06-10 13:08 ` [PATCHv2 0/6] Handle trying to use a native target with the wrong binary Andrew Burgess
2022-06-10 13:08 ` [PATCHv2 1/6] gdb/arm: move fetch of arm_gdbarch_tdep to a more inner scope Andrew Burgess
2022-06-10 13:08 ` [PATCHv2 2/6] gdb/mips: rewrite show_mask_address Andrew Burgess
2022-06-10 13:08 ` [PATCHv2 3/6] gdb/arm: avoid undefined behaviour in arm_frame_is_thumb Andrew Burgess
2022-06-10 15:21 ` Luis Machado
2022-06-10 15:49 ` Andrew Burgess
2022-06-10 16:29 ` Luis Machado
2022-06-10 13:08 ` [PATCHv2 4/6] gdb: move the type cast into gdbarch_tdep Andrew Burgess
2022-06-10 16:35 ` Luis Machado
2022-06-10 13:08 ` [PATCHv2 5/6] gdb: ensure the cast in gdbarch_tdep is valid Andrew Burgess
2022-06-10 13:08 ` [PATCHv2 6/6] gdb: native target invalid architecture detection Andrew Burgess
2022-06-10 16:20 ` John Baldwin
2022-06-10 16:31 ` Luis Machado
2022-06-13 16:15 ` [PATCHv3 0/6] Handle trying to use a native target with the wrong binary Andrew Burgess
2022-06-13 16:15 ` [PATCHv3 1/6] gdb/arm: move fetch of arm_gdbarch_tdep to a more inner scope Andrew Burgess
2022-06-13 16:15 ` [PATCHv3 2/6] gdb/mips: rewrite show_mask_address Andrew Burgess
2022-06-13 16:15 ` [PATCHv3 3/6] gdb: select suitable thread for gdbarch_adjust_breakpoint_address Andrew Burgess
2022-06-14 9:45 ` Luis Machado
2022-06-14 14:05 ` Andrew Burgess
2022-06-24 16:58 ` Pedro Alves
2022-06-13 16:15 ` [PATCHv3 4/6] gdb: move the type cast into gdbarch_tdep Andrew Burgess
2022-06-13 16:15 ` [PATCHv3 5/6] gdb: ensure the cast in gdbarch_tdep is valid Andrew Burgess
2022-06-24 18:15 ` Pedro Alves
2022-06-13 16:15 ` [PATCHv3 6/6] gdb: native target invalid architecture detection Andrew Burgess
2022-06-24 19:23 ` Pedro Alves
2022-06-27 16:27 ` Andrew Burgess
2022-06-27 21:38 ` Pedro Alves
2022-06-28 10:37 ` Andrew Burgess
2022-06-28 12:42 ` [PATCH v2] gdb+gdbserver/Linux: avoid reading registers while going through shell (was: Re: [PATCHv3 6/6] gdb: native target invalid architecture detection) Pedro Alves
2022-06-28 14:21 ` Andrew Burgess
2022-06-29 15:17 ` Simon Marchi
2022-06-29 16:22 ` [PATCH] Fix GDBserver regression due to change to avoid reading shell registers Pedro Alves
2022-06-29 16:38 ` Simon Marchi
2022-06-30 9:33 ` [PATCHv3 6/6] gdb: native target invalid architecture detection Andrew Burgess
2022-06-30 11:44 ` Pedro Alves
2022-07-11 10:47 ` Andrew Burgess [this message]
2022-06-24 10:15 ` [PATCHv3 0/6] Handle trying to use a native target with the wrong binary Andrew Burgess
2022-06-28 14:28 ` [PATCHv4 0/6] Detect invalid casts of gdbarch_tdep structures Andrew Burgess
2022-06-28 14:28 ` [PATCHv4 1/6] gdb/arm: move fetch of arm_gdbarch_tdep to a more inner scope Andrew Burgess
2022-06-28 14:28 ` [PATCHv4 2/6] gdb/mips: rewrite show_mask_address Andrew Burgess
2022-06-28 14:28 ` [PATCHv4 3/6] gdb: select suitable thread for gdbarch_adjust_breakpoint_address Andrew Burgess
2022-06-28 14:28 ` [PATCHv4 4/6] gdb: move the type cast into gdbarch_tdep Andrew Burgess
2022-06-28 14:28 ` [PATCHv4 5/6] gdbsupport: add checked_static_cast Andrew Burgess
2022-06-28 14:28 ` [PATCHv4 6/6] gdb: ensure the cast in gdbarch_tdep is valid Andrew Burgess
2022-07-11 10:46 ` [PATCHv4 0/6] Detect invalid casts of gdbarch_tdep structures Andrew Burgess
2022-07-21 18:21 ` Andrew Burgess
2022-07-22 0:50 ` Luis Machado
2022-07-23 0:02 ` [PATCH] Rename gdbarch_tdep template function to gdbarch_tdep_cast for g++ 4.8 Mark Wielaard
2022-07-25 11:19 ` Andrew Burgess
2022-07-25 11:27 ` Mark Wielaard
2022-07-26 11:05 ` Andrew Burgess
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