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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:subject:to:references:cc:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding; bh=V45e8T5GJs05wGDZ69iNzUG+d4q0XE/HxKVpC0IEhRc=; b=P6QgW9t0VRvHeoiPvhI5G7/eTFK5LTSmtOxAwduQs+acMFK6c8pB0f60TtW7NALDgK IZDGYiCU8QNOL0yUrZEz9Z9h/zReTgOKOYQnYmaPnsQ2wJnFh2Z0Zi1fMDGEins3N8d9 ru0eSNCAfVj6GqIc1ISi+vODxaC16alQ5BYoKGRXASsN6V5Mb61fdBJLsu71LKm8V4j/ eLDZlkymw/7cZEiNIs66qCq1Up6zKeGiHgmhT1yA29CuAMVN+ZIFxKn6X97ED6s6LMA1 1dpTEd4/mDvjugOVe+bKcRA3fjZNshrfi8Bh77XuEqAKkKvgtujPd7Rkwj9uWbFt8FlT I1aA== X-Gm-Message-State: AE9vXwMJgGRyZRmyyDg3toFlBGxIEBrV2BlknNF4dLjkxSjcP9kMAtY+dQoV+bx3uSrFiehz X-Received: by 10.129.74.2 with SMTP id x2mr1510079ywa.59.1474551780592; Thu, 22 Sep 2016 06:43:00 -0700 (PDT) Subject: Re: [PATCH 1/4] Add INTERNAL_SYSCALL_CALL To: Florian Weimer References: <1474383714-15187-1-git-send-email-adhemerval.zanella@linaro.org> <1474383714-15187-2-git-send-email-adhemerval.zanella@linaro.org> <87h99amey7.fsf@mid.deneb.enyo.de> <89560945-9ba0-395a-3829-bb0eae62affb@linaro.org> <87k2e5gir6.fsf@mid.deneb.enyo.de> Cc: libc-alpha@sourceware.org From: Adhemerval Zanella Message-ID: Date: Thu, 22 Sep 2016 10:42:55 -0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 MIME-Version: 1.0 In-Reply-To: <87k2e5gir6.fsf@mid.deneb.enyo.de> On 21/09/2016 16:22, Florian Weimer wrote: > * Adhemerval Zanella: > >> On 20/09/2016 18:36, Florian Weimer wrote: >>> * Adhemerval Zanella: >>> >>>> +#define __INTERNAL_SYSCALL0(name, err) \ >>>> + INTERNAL_SYSCALL (name, err, 0) >>>> +#define __INTERNAL_SYSCALL1(name, err, a1) \ >>>> + INTERNAL_SYSCALL (name, err, 1, a1) >>>> +#define __INTERNAL_SYSCALL2(name, err, a1, a2) \ >>>> + INTERNAL_SYSCALL (name, err, 2, a1, a2) >>>> +#define __INTERNAL_SYSCALL3(name, err, a1, a2, a3) \ >>>> + INTERNAL_SYSCALL (name, err, 3, a1, a2, a3) >>>> +#define __INTERNAL_SYSCALL4(name, err, a1, a2, a3, a4) \ >>>> + INTERNAL_SYSCALL (name, err, 4, a1, a2, a3, a4) >>>> +#define __INTERNAL_SYSCALL5(name, err, a1, a2, a3, a4, a5) \ >>>> + INTERNAL_SYSCALL (name, err, 5, a1, a2, a3, a4, a5) >>>> +#define __INTERNAL_SYSCALL6(name, err, a1, a2, a3, a4, a5, a6) \ >>>> + INTERNAL_SYSCALL (name, err, 6, a1, a2, a3, a4, a5, a6) >>>> +#define __INTERNAL_SYSCALL7(name, err, a1, a2, a3, a4, a5, a6, a7) \ >>>> + INTERNAL_SYSCALL (name, err, 7, a1, a2, a3, a4, a5, a6, a7) >>> >>> It's not immediately obvious why these definitions are needed. >> >> I agree this is not obvious, but it follows the SYSCALL_CANCEL macro logic >> where __INTERNAL_SYSCALL_DISP will select the correct __INTERNAL_SYSCALL >> (based on number of arguments). > > Is there anything that overrides inidivdual __INTERNAL_SYSCALLx > macros? > > What I mean is this: Why can't this > > +#define __INTERNAL_SYSCALL_DISP(b,err,...) \ > + __INTERNAL_SYSCALL_CONCAT (b, __SYSCALL_NARGS (__VA_ARGS__)) \ > + (err, __VA_ARGS__) > > turn into > > +#define __INTERNAL_SYSCALL_DISP(b,err,...) \ > + INTERNAL_SYSCALL (b, err, __SYSCALL_NARGS (__VA_ARGS__), __VA_ARGS__) > > ? > We can, at least for x86_64 for instance where it uses another indirection for INTERNAL_SYSCALL. However, something similar fails for i386, where macro substitution for INTERNAL_SYSCALL will try string concatenation and thus mess with intended behaviour. Also, _SYSCALL_NARGS macro would be required to be different to take in consideration the 'err' argument required for INTERNAL syscall (something I noted I coded wrong). I think calling the {INLINE,INTERNAL}_SYSCALL directly would be the safer and agnostic approach to avoid issues on how they are actually implemented by each port. I tested the following patch with a build for practically all current supported ports (aarch64, alpha, armeabi, armeaihf, hppa, ia64, i386, m68k, microblaze, mips{32,64,n64}, nios2, powerpc{32,64,64le}, s390{-32,-64}, sh4, sparc{64}, tile{pro,x64}, x86_64, and x32) and saw no build issues. I also checked on x86_64 and i386. To actually check INTERNAL_SYSCALL_CALL macro work I changed sysdeps/unix/sysv/linux/pthread_setaffinity.c to use it. For below patch I changed it to the INLINE_SYSCALL macros would follow INLINE name and fixed the __INTERNAL_SYSCALL_NARGS argument selection value. diff --git a/sysdeps/unix/sysdep.h b/sysdeps/unix/sysdep.h index 94a2ce0..dfd3cfd 100644 --- a/sysdeps/unix/sysdep.h +++ b/sysdeps/unix/sysdep.h @@ -24,42 +24,79 @@ #define SYSCALL__(name, args) PSEUDO (__##name, name, args) #define SYSCALL(name, args) PSEUDO (name, name, args) -#define __SYSCALL0(name) \ +#define __SYSCALL_CONCAT_X(a,b) a##b +#define __SYSCALL_CONCAT(a,b) __SYSCALL_CONCAT_X (a, b) + + +#define __INTERNAL_SYSCALL0(name, err) \ + INTERNAL_SYSCALL (name, err, 0) +#define __INTERNAL_SYSCALL1(name, err, a1) \ + INTERNAL_SYSCALL (name, err, 1, a1) +#define __INTERNAL_SYSCALL2(name, err, a1, a2) \ + INTERNAL_SYSCALL (name, err, 2, a1, a2) +#define __INTERNAL_SYSCALL3(name, err, a1, a2, a3) \ + INTERNAL_SYSCALL (name, err, 3, a1, a2, a3) +#define __INTERNAL_SYSCALL4(name, err, a1, a2, a3, a4) \ + INTERNAL_SYSCALL (name, err, 4, a1, a2, a3, a4) +#define __INTERNAL_SYSCALL5(name, err, a1, a2, a3, a4, a5) \ + INTERNAL_SYSCALL (name, err, 5, a1, a2, a3, a4, a5) +#define __INTERNAL_SYSCALL6(name, err, a1, a2, a3, a4, a5, a6) \ + INTERNAL_SYSCALL (name, err, 6, a1, a2, a3, a4, a5, a6) +#define __INTERNAL_SYSCALL7(name, err, a1, a2, a3, a4, a5, a6, a7) \ + INTERNAL_SYSCALL (name, err, 7, a1, a2, a3, a4, a5, a6, a7) + +#define __INTERNAL_SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n +#define __INTERNAL_SYSCALL_NARGS(...) \ + __INTERNAL_SYSCALL_NARGS_X (__VA_ARGS__,6,5,4,3,2,1,0,) +#define __INTERNAL_SYSCALL_DISP(b,...) \ + __SYSCALL_CONCAT (b,__INTERNAL_SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__) + +/* Issue a syscall defined by syscall number plus any other argument required. + It is similar to INTERNAL_SYSCALL macro, but without the need to pass the + expected argument number as second parameter. */ +#define INTERNAL_SYSCALL_CALL(...) \ + __INTERNAL_SYSCALL_DISP (__INTERNAL_SYSCALL, __VA_ARGS__) + +#define __INLINE_SYSCALL0(name) \ INLINE_SYSCALL (name, 0) -#define __SYSCALL1(name, a1) \ +#define __INLINE_SYSCALL1(name, a1) \ INLINE_SYSCALL (name, 1, a1) -#define __SYSCALL2(name, a1, a2) \ +#define __INLINE_SYSCALL2(name, a1, a2) \ INLINE_SYSCALL (name, 2, a1, a2) -#define __SYSCALL3(name, a1, a2, a3) \ +#define __INLINE_SYSCALL3(name, a1, a2, a3) \ INLINE_SYSCALL (name, 3, a1, a2, a3) -#define __SYSCALL4(name, a1, a2, a3, a4) \ +#define __INLINE_SYSCALL4(name, a1, a2, a3, a4) \ INLINE_SYSCALL (name, 4, a1, a2, a3, a4) -#define __SYSCALL5(name, a1, a2, a3, a4, a5) \ +#define __INLINE_SYSCALL5(name, a1, a2, a3, a4, a5) \ INLINE_SYSCALL (name, 5, a1, a2, a3, a4, a5) -#define __SYSCALL6(name, a1, a2, a3, a4, a5, a6) \ +#define __INLINE_SYSCALL6(name, a1, a2, a3, a4, a5, a6) \ INLINE_SYSCALL (name, 6, a1, a2, a3, a4, a5, a6) -#define __SYSCALL7(name, a1, a2, a3, a4, a5, a6, a7) \ +#define __INLINE_SYSCALL7(name, a1, a2, a3, a4, a5, a6, a7) \ INLINE_SYSCALL (name, 7, a1, a2, a3, a4, a5, a6, a7) -#define __SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n -#define __SYSCALL_NARGS(...) \ - __SYSCALL_NARGS_X (__VA_ARGS__,7,6,5,4,3,2,1,0,) -#define __SYSCALL_CONCAT_X(a,b) a##b -#define __SYSCALL_CONCAT(a,b) __SYSCALL_CONCAT_X (a, b) -#define __SYSCALL_DISP(b,...) \ - __SYSCALL_CONCAT (b,__SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__) +#define __INLINE_SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n +#define __INLINE_SYSCALL_NARGS(...) \ + __INLINE_SYSCALL_NARGS_X (__VA_ARGS__,7,6,5,4,3,2,1,0,) +#define __INLINE_SYSCALL_DISP(b,...) \ + __SYSCALL_CONCAT (b,__INLINE_SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__) -#define __SYSCALL_CALL(...) __SYSCALL_DISP (__SYSCALL, __VA_ARGS__) +/* Issue a syscall defined by syscall number plus any other argument + required. Any error will be handled using arch defined macros and errno + will be set accordingly. + It is similar to INLINE_SYSCALL macro, but without the need to pass the + expected argument number as second parameter. */ +#define INLINE_SYSCALL_CALL(...) \ + __INLINE_SYSCALL_DISP (__INLINE_SYSCALL, __VA_ARGS__) #define SYSCALL_CANCEL(...) \ ({ \ long int sc_ret; \ if (SINGLE_THREAD_P) \ - sc_ret = __SYSCALL_CALL (__VA_ARGS__); \ + sc_ret = INLINE_SYSCALL_CALL (__VA_ARGS__); \ else \ { \ int sc_cancel_oldtype = LIBC_CANCEL_ASYNC (); \ - sc_ret = __SYSCALL_CALL (__VA_ARGS__); \ + sc_ret = INLINE_SYSCALL_CALL (__VA_ARGS__); \ LIBC_CANCEL_RESET (sc_cancel_oldtype); \ } \ sc_ret;