From patchwork Sat May 24 00:11:44 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 352057 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from sourceware.org (server1.sourceware.org [209.132.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 35FB0140085 for ; Sat, 24 May 2014 10:12:56 +1000 (EST) DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:to:cc:subject:date:message-id:in-reply-to :references; q=dns; s=default; b=dfDX5gTGUDJxIu6v/dZ7FSBck9Twyc3 2de/R7FnVKeSGwy3GIBAqDl3IITijWUWrLohp242leQS1l+tQWGAytZjxoS8BhqP +0wVek2o722ozMr25GWfiDyGsEY6tOx5HwCIYuiR1GvtfPWaQIASJ/15R1LpAsUa LGTlGiVYoH5A= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:to:cc:subject:date:message-id:in-reply-to :references; s=default; bh=EJiRz10akxKDPmFL1SRlP5M2b7E=; b=WXytk WBo17EjrlLjlmSXn2BgXDqNdwxti2C3nCVKengXCX0CspgI8SGVxeelgJY+/R0HE F1PPQKXwh3ia6TFX9nRpG4n2w3irbJ0gq4CZ43HTU/F6m8npFUckorjGUuZEqyU8 Ou0CwZNH6Dj7YlntjCC7bZS08bzoKJYCmzT1iI= Received: (qmail 24552 invoked by alias); 24 May 2014 00:12:15 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 24481 invoked by uid 89); 24 May 2014 00:12:15 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=0.3 required=5.0 tests=AWL, BAYES_20, FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE, SPF_PASS, TBC autolearn=no version=3.3.2 X-HELO: mail-qg0-f45.google.com X-Received: by 10.140.31.119 with SMTP id e110mr11157862qge.74.1400890331595; Fri, 23 May 2014 17:12:11 -0700 (PDT) From: Richard Henderson To: libc-alpha@sourceware.org Cc: marcus.shawcroft@gmail.com, Richard Henderson Subject: [PATCH v2 4/9] aarch64: Improve sysdep-cancel.h Date: Fri, 23 May 2014 17:11:44 -0700 Message-Id: <1400890309-16710-5-git-send-email-rth@twiddle.net> In-Reply-To: <1400890309-16710-1-git-send-email-rth@twiddle.net> References: <1400890309-16710-1-git-send-email-rth@twiddle.net> From: Richard Henderson Use a constant frame size, rather than pushing/popping for every saved register. Use stp, ldp, cbz. Share code with the _nocancel path. --- .../unix/sysv/linux/aarch64/nptl/sysdep-cancel.h | 181 +++++++-------------- 1 file changed, 63 insertions(+), 118 deletions(-) diff --git a/sysdeps/unix/sysv/linux/aarch64/nptl/sysdep-cancel.h b/sysdeps/unix/sysv/linux/aarch64/nptl/sysdep-cancel.h index c300b2d..a78e2ad 100644 --- a/sysdeps/unix/sysv/linux/aarch64/nptl/sysdep-cancel.h +++ b/sysdeps/unix/sysv/linux/aarch64/nptl/sysdep-cancel.h @@ -26,120 +26,66 @@ # undef PSEUDO # define PSEUDO(name, syscall_name, args) \ - .section ".text"; \ - .type __##syscall_name##_nocancel,%function; \ - .globl __##syscall_name##_nocancel; \ - __##syscall_name##_nocancel: \ - cfi_startproc; \ - DO_CALL (syscall_name, args); \ - cmn x0, 4095; \ - b.cs .Lsyscall_error; \ - PSEUDO_RET; \ - cfi_endproc; \ - .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \ - ENTRY (name); \ - SINGLE_THREAD_P; \ - bne .Lpseudo_cancel; \ - DO_CALL (syscall_name, 0); \ - cmn x0, 4095; \ - b.cs .Lsyscall_error; \ - PSEUDO_RET; \ - .Lpseudo_cancel: \ - DOCARGS_##args; /* save syscall args etc. around CENABLE. */ \ - CENABLE; \ - mov x16, x0; /* put mask in safe place. */ \ - UNDOCARGS_##args; /* restore syscall args. */ \ - mov x8, SYS_ify (syscall_name); /* do the call. */ \ - svc 0; \ - str x0, [sp, -16]!; /* save syscall return value. */ \ - cfi_adjust_cfa_offset (16); \ - mov x0, x16; /* get mask back. */ \ - CDISABLE; \ - ldr x0, [sp], 16; \ - cfi_adjust_cfa_offset (-16); \ - ldr x30, [sp], 16; \ - cfi_adjust_cfa_offset (-16); \ - cfi_restore (x30); \ - cmn x0, 4095; \ - b.cs .Lsyscall_error; - -# define DOCARGS_0 \ - str x30, [sp, -16]!; \ - cfi_adjust_cfa_offset (16); \ - cfi_rel_offset (x30, 0) - + .section ".text"; \ +ENTRY (__##syscall_name##_nocancel); \ +.Lpseudo_nocancel: \ + DO_CALL (syscall_name, args); \ +.Lpseudo_ret: \ + cmn x0, 4095; \ + b.cs .Lsyscall_error; \ + .subsection 2; \ + .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \ +ENTRY (name); \ + SINGLE_THREAD_P(16); \ + cbz w16, .Lpseudo_nocancel; \ + /* Setup common stack frame no matter the number of args. */ \ + stp x19, x30, [sp, -64]!; \ + cfi_adjust_cfa_offset (64); \ + cfi_rel_offset (x19, 0); \ + cfi_rel_offset (x30, 8); \ + DOCARGS_##args; /* save syscall args around CENABLE. */ \ + CENABLE; \ + mov x19, x0; /* save mask around syscall. */ \ + UNDOCARGS_##args; /* restore syscall args. */ \ + DO_CALL (syscall_name, args); \ + str x0, [sp, 16]; /* save syscall return value. */ \ + mov x0, x19; /* pass mask to CDISABLE. */ \ + CDISABLE; \ + ldr x0, [sp, 16]; \ + ldp x19, x30, [sp], 64; \ + cfi_adjust_cfa_offset (-64); \ + cfi_restore (x19); \ + cfi_restore (x30); \ + b .Lpseudo_ret; \ + cfi_endproc; \ + .size name, .-name; \ + .previous + +# undef PSEUDO_END +# define PSEUDO_END(name) \ + SYSCALL_ERROR_HANDLER; \ + cfi_endproc + +# define DOCARGS_0 # define UNDOCARGS_0 -# define DOCARGS_1 \ - DOCARGS_0; \ - str x0, [sp, -16]!; \ - cfi_adjust_cfa_offset (16); \ - cfi_rel_offset (x0, 0) - -# define UNDOCARGS_1 \ - ldr x0, [sp], 16; \ - cfi_restore (x0); \ - cfi_adjust_cfa_offset (-16); \ - -# define DOCARGS_2 \ - DOCARGS_1; \ - str x1, [sp, -16]!; \ - cfi_adjust_cfa_offset (16); \ - cfi_rel_offset (x1, 0) - -# define UNDOCARGS_2 \ - ldr x1, [sp], 16; \ - cfi_restore (x1); \ - cfi_adjust_cfa_offset (-16); \ - UNDOCARGS_1 - -# define DOCARGS_3 \ - DOCARGS_2; \ - str x2, [sp, -16]!; \ - cfi_adjust_cfa_offset (16); \ - cfi_rel_offset (x2, 0) - -# define UNDOCARGS_3 \ - ldr x2, [sp], 16; \ - cfi_restore (x2); \ - cfi_adjust_cfa_offset (-16); \ - UNDOCARGS_2 - -# define DOCARGS_4 \ - DOCARGS_3; \ - str x3, [sp, -16]!; \ - cfi_adjust_cfa_offset (16); \ - cfi_rel_offset (x3, 0) - -# define UNDOCARGS_4 \ - ldr x3, [sp], 16; \ - cfi_restore (x3); \ - cfi_adjust_cfa_offset (-16); \ - UNDOCARGS_3 - -# define DOCARGS_5 \ - DOCARGS_4; \ - str x4, [sp, -16]!; \ - cfi_adjust_cfa_offset (16); \ - cfi_rel_offset (x4, 0) - -# define UNDOCARGS_5 \ - ldr x4, [sp], 16; \ - cfi_restore (x4); \ - cfi_adjust_cfa_offset (-16); \ - UNDOCARGS_4 - -# define DOCARGS_6 \ - DOCARGS_5; \ - str x5, [sp, -16]!; \ - cfi_adjust_cfa_offset (16); \ - cfi_rel_offset (x5, 0) - -# define UNDOCARGS_6 \ - ldr x5, [sp], 16; \ - cfi_restore (x5); \ - cfi_adjust_cfa_offset (-16); \ - UNDOCARGS_5 +# define DOCARGS_1 str x0, [sp, 16] +# define UNDOCARGS_1 ldr x0, [sp, 16] + +# define DOCARGS_2 stp x0, x1, [sp, 16] +# define UNDOCARGS_2 ldp x0, x1, [sp, 16] + +# define DOCARGS_3 DOCARGS_2; str x2, [sp, 32] +# define UNDOCARGS_3 UNDOCARGS_2; ldr x2, [sp, 32] + +# define DOCARGS_4 DOCARGS_2; stp x2, x3, [sp, 32] +# define UNDOCARGS_4 UNDOCARGS_2; ldp x2, x3, [sp, 32] + +# define DOCARGS_5 DOCARGS_4; str x4, [sp, 48] +# define UNDOCARGS_5 UNDOCARGS_4; ldr x4, [sp, 48] + +# define DOCARGS_6 DOCARGS_4; stp x4, x5, [sp, 48] +# define UNDOCARGS_6 UNDOCARGS_4; ldp x4, x5, [sp, 48] # ifdef IS_IN_libpthread # define CENABLE bl __pthread_enable_asynccancel @@ -161,10 +107,9 @@ extern int __local_multiple_threads attribute_hidden; # define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1) # else -# define SINGLE_THREAD_P \ - adrp x16, __local_multiple_threads; \ - ldr w16, [x16, :lo12:__local_multiple_threads]; \ - cmp w16, 0; +# define SINGLE_THREAD_P(R) \ + adrp x##R, __local_multiple_threads; \ + ldr w##R, [x##R, :lo12:__local_multiple_threads] # endif # else /* There is no __local_multiple_threads for librt, so use the TCB. */ @@ -173,14 +118,14 @@ extern int __local_multiple_threads attribute_hidden; __builtin_expect (THREAD_GETMEM (THREAD_SELF, \ header.multiple_threads) == 0, 1) # else -# define SINGLE_THREAD_P \ +# define SINGLE_THREAD_P(R) \ stp x0, x30, [sp, -16]!; \ cfi_adjust_cfa_offset (16); \ cfi_rel_offset (x0, 0); \ cfi_rel_offset (x30, 8); \ bl __read_tp; \ sub x0, x0, PTHREAD_SIZEOF; \ - ldr w16, [x0, PTHREAD_MULTIPLE_THREADS_OFFSET]; \ + ldr w##R, [x0, PTHREAD_MULTIPLE_THREADS_OFFSET]; \ ldp x0, x30, [sp], 16; \ cfi_restore (x0); \ cfi_restore (x30); \