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Message-ID: <bb9b315e-1784-67e1-dc98-549da333f1fa@loongson.cn>
Date: Wed, 10 May 2023 11:36:49 +0800
From: 王洪亮 <wanghongliang@...ngson.cn>
To: musl@...ts.openwall.com
Subject: Re: add loongarch64 port v7.
Hi, Rich
Is there anything else that needs to be modified in
0001-add-loongarch64-port-v7.patch?
在 2023/4/18 下午7:32, 王洪亮 写道:
>
> 在 2023/4/18 下午5:38, Szabolcs Nagy 写道:
>> * 王洪亮 <wanghongliang@...ngson.cn> [2023-04-18 09:28:49 +0800]:
>>> +++ b/arch/loongarch64/bits/signal.h
>>> @@ -6,14 +6,27 @@
>>> #define SIGSTKSZ 16384
>>> #endif
>>>
>>> +#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
>>> typedef unsigned long greg_t, gregset_t[32];
>>>
>>> -typedef struct sigcontext {
>>> +struct sigcontext {
>>> unsigned long sc_pc;
>>> - gregset_t sc_regs;
>>> - unsigned int sc_flags;
>>> - unsigned long sc_extcontext[];
>>> + unsigned long sc_regs[32];
>>> + unsigned int sc_flags;
>>> + unsigned long sc_extcontext[] __attribute__((__aligned__(16)));
>>> +};
>> this looks good. (i don't know if this is really
>> needed in signal.h, but other targets have it too)
>>
>>> +
>>> +typedef struct {
>>> + unsigned long __pc;
>>> + unsigned long __gregs[32];
>>> + unsigned int __flags;
>>> + unsigned long __extcontext[] __attribute__((__aligned__(16)));
>>> } mcontext_t;
>> i would use the same struct tag as glibc so
>>
>> typedef struct mcontext_t { ...
>>
>> (we don't need c++ abi compat with glibc, but
>> it's nicer to be consistent)
>>
>>> +#else
>>> +typedef struct {
>>> + unsigned long __space[34];
>>> +} mcontext_t;
>> i would add the aligned attribute here.
>>
>> (it's more important to match the kernel layout than to
>> avoid c extensions in standard mode: loongarch c compilers
>> will all support the aligned attribute in system headers)
> I understand there is no need for me to submit modifications,
> you help me modify it directly,right?
>>> +#endif
>>>
>>> struct sigaltstack {
>>> void *ss_sp;
>>> @@ -23,11 +36,10 @@ struct sigaltstack {
>>>
>>> typedef struct __ucontext
>>> {
>>> - unsigned long uc_flags;
>>> + unsigned long __uc_flags;
>>> struct __ucontext *uc_link;
>>> stack_t uc_stack;
>>> sigset_t uc_sigmask;
>>> - long __uc_pad;
>>> mcontext_t uc_mcontext;
>>> } ucontext_t;
>> looks good.
>>
>> (the only issue is if some code uses uc_flags in an
>> arch independent way. i don't know if there is any
>> use for it on linux. but we can fix that later on
>> both glibc and musl side if it comes up.)
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