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Re: [Xen-devel] [PATCH] tools/gdbsx: fix 'g' packet response for 64bit guests
- To: Wei Liu <wei.liu2@xxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 31 Jul 2018 10:08:06 +0100
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- Cc: Elena Ufimtseva <elena.ufimtseva@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxx
- Delivery-date: Tue, 31 Jul 2018 09:08:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 31/07/18 10:00, Wei Liu wrote:
> On Tue, Jul 31, 2018 at 04:30:42AM +0200, Marek Marczykowski-Górecki wrote:
>> gdb 8.0 fixed bounds checking for 'g' packet (commit
>> 9dc193c3be85aafa60ceff57d3b0430af607b4ce "Check for truncated
>> registers in process_g_packet"). This revealed that gdbsx did
>> not properly formatted 'g' packet - segment registers and eflags are
>> expected to be 32-bit fields in the response (according to
>> gdb/features/i386/64bit-core.xml in gdb sources). Specific error is:
>>
>> Truncated register 26 in remote 'g' packet
>>
>> instead of silently truncating part of register.
>>
>> Additionally, it looks like segment registers of 64bit guests were never
>> reported correctly, because of type mismatch.
>>
>> Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
>> ---
>> tools/debugger/gdbsx/gx/gx_local.c | 6 +++---
>> tools/debugger/gdbsx/xg/xg_main.c | 20 ++++++++++----------
>> tools/debugger/gdbsx/xg/xg_public.h | 18 +++++++++---------
>> 3 files changed, 22 insertions(+), 22 deletions(-)
>>
>> diff --git a/tools/debugger/gdbsx/gx/gx_local.c
>> b/tools/debugger/gdbsx/gx/gx_local.c
>> index 1bec03d49c..33556a582d 100644
>> --- a/tools/debugger/gdbsx/gx/gx_local.c
>> +++ b/tools/debugger/gdbsx/gx/gx_local.c
>> @@ -45,8 +45,8 @@ prnt_32regs(struct xg_gdb_regs32 *r32p)
>> static void
>> prnt_64regs(struct xg_gdb_regs64 *r64p)
>> {
>> - printf("rip:"XGF64" rsp:"XGF64" flags:"XGF64"\n", r64p->rip, r64p->rsp,
>> - r64p->rflags);
>> + printf("rip:"XGF64" rsp:"XGF64" flags:%08x\n", r64p->rip, r64p->rsp,
>> + r64p->eflags);
> I think it would be better to introduce XGF32 and XGFM32 in the header.
??? inttypes.h is a standard header for a reason...
I'd suggest instead that, if cleanup were being done, purging these
nonstandard PRIx64's would be a much better option.
~Andrew
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