Re: [Qemu-devel] [PULL] slirp: Fix issues with -mms-bitfields

[Jan Kiszka]

On 2011-08-23 12:49, TeLeMan wrote:
> On Sun, Aug 21, 2011 at 04:00, Stefan Weil <address@hidden> wrote:
>> Am 15.08.2011 08:39, schrieb Jan Kiszka:
>>>
>>> The following changes since commit
>>> 3b6ffe50300f13240e1b46420ad05da1116df410:
>>>
>>> hw/scsi-bus.c: Fix use of uninitialised variable (2011-08-14 19:34:25
>>> +0000)
>>>
>>> are available in the git repository at:
>>> git://git.kiszka.org/qemu.git queues/slirp
>>>
>>> Jan Kiszka (1):
>>> slirp: Fix bit field types in IP header structs
>>>
>>> slirp/ip.h | 8 ++++----
>>> slirp/tcp.h | 4 ++--
>>> 2 files changed, 6 insertions(+), 6 deletions(-)
>>>
>>> ---
>>>
>>> slirp: Fix bit field types in IP header structs
>>>
>>> -mms-bitfields prevents that the bitfields in current IP header structs
>>> are packed into a single byte as it is required. Fix this by using
>>> uint8_t as backing type.
>>>
>>> Signed-off-by: Jan Kiszka <address@hidden>
>>> ---
>>> slirp/ip.h | 8 ++++----
>>> slirp/tcp.h | 4 ++--
>>> 2 files changed, 6 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/slirp/ip.h b/slirp/ip.h
>>> index 48ea38e..72dbe9a 100644
>>> --- a/slirp/ip.h
>>> +++ b/slirp/ip.h
>>> @@ -74,10 +74,10 @@ typedef uint32_t n_long; /* long as received from the
>>> net */
>>> */
>>> struct ip {
>>> #ifdef HOST_WORDS_BIGENDIAN
>>> - u_int ip_v:4, /* version */
>>> + uint8_t ip_v:4, /* version */
>>> ip_hl:4; /* header length */
>>> #else
>>> - u_int ip_hl:4, /* header length */
>>> + uint8_t ip_hl:4, /* header length */
>>> ip_v:4; /* version */
>>> #endif
>>> uint8_t ip_tos; /* type of service */
>>> @@ -140,10 +140,10 @@ struct ip_timestamp {
>>> uint8_t ipt_len; /* size of structure (variable) */
>>> uint8_t ipt_ptr; /* index of current entry */
>>> #ifdef HOST_WORDS_BIGENDIAN
>>> - u_int ipt_oflw:4, /* overflow counter */
>>> + uint8_t ipt_oflw:4, /* overflow counter */
>>> ipt_flg:4; /* flags, see below */
>>> #else
>>> - u_int ipt_flg:4, /* flags, see below */
>>> + uint8_t ipt_flg:4, /* flags, see below */
>>> ipt_oflw:4; /* overflow counter */
>>> #endif
>>> union ipt_timestamp {
>>> diff --git a/slirp/tcp.h b/slirp/tcp.h
>>> index 9d06836..b3817cb 100644
>>> --- a/slirp/tcp.h
>>> +++ b/slirp/tcp.h
>>> @@ -51,10 +51,10 @@ struct tcphdr {
>>> tcp_seq th_seq; /* sequence number */
>>> tcp_seq th_ack; /* acknowledgement number */
>>> #ifdef HOST_WORDS_BIGENDIAN
>>> - u_int th_off:4, /* data offset */
>>> + uint8_t th_off:4, /* data offset */
>>> th_x2:4; /* (unused) */
>>> #else
>>> - u_int th_x2:4, /* (unused) */
>>> + uint8_t th_x2:4, /* (unused) */
>>> th_off:4; /* data offset */
>>> #endif
>>> uint8_t th_flags;
>>
>> Tested-by: Stefan Weil <address@hidden>
>>
> slirp is still broken on my mingw32. I used "#progma
> pack(push,1)/#progma pack(pop)" to resolve this issue.

Can you drill down to the bottom of this problem? What fields in what
struct are not properly packed? Maybe this is now a compiler bug, so
comparing versions may make sense as well.

Jan

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