From patchwork Tue Dec 15 20:57:25 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Lu, Hongjiu" X-Patchwork-Id: 10026 Received: (qmail 118960 invoked by alias); 15 Dec 2015 20:57:28 -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 118950 invoked by uid 89); 15 Dec 2015 20:57:27 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.1 required=5.0 tests=AWL, BAYES_00, KAM_LAZY_DOMAIN_SECURITY, NO_DNS_FOR_FROM, T_RP_MATCHES_RCVD autolearn=no version=3.3.2 X-HELO: mga04.intel.com X-ExtLoop1: 1 Date: Tue, 15 Dec 2015 12:57:25 -0800 From: "H.J. Lu" To: GNU C Library Subject: [PATCH] Add REGISTERS_CLOBBERED_BY_SYSCALL for x86-64 Message-ID: <20151215205725.GA11164@intel.com> Reply-To: "H.J. Lu" MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.24 (2015-08-30) X86-64 system calls use a different calling convention, which clobbers CC, %r11 an %rcx registers. Define REGISTERS_CLOBBERED_BY_SYSCALL for x86-64 inline asm statements. Tested on x86-64. OK for master? H.J. --- * sysdeps/unix/sysv/linux/x86_64/sysdep.h (REGISTERS_CLOBBERED_BY_SYSCALL): New. (INTERNAL_SYSCALL_NCS): Use it. (INTERNAL_SYSCALL_NCS_TYPES): Likewise. --- sysdeps/unix/sysv/linux/x86_64/sysdep.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/sysdeps/unix/sysv/linux/x86_64/sysdep.h b/sysdeps/unix/sysv/linux/x86_64/sysdep.h index fc132f6..c364d08 100644 --- a/sysdeps/unix/sysv/linux/x86_64/sysdep.h +++ b/sysdeps/unix/sysv/linux/x86_64/sysdep.h @@ -218,6 +218,9 @@ # undef INTERNAL_SYSCALL_DECL # define INTERNAL_SYSCALL_DECL(err) do { } while (0) +/* Registers clobbered by syscall. */ +# define REGISTERS_CLOBBERED_BY_SYSCALL "cc", "r11", "cx" + # define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ ({ \ unsigned long int resultvar; \ @@ -226,7 +229,7 @@ asm volatile ( \ "syscall\n\t" \ : "=a" (resultvar) \ - : "0" (name) ASM_ARGS_##nr : "memory", "cc", "r11", "cx"); \ + : "0" (name) ASM_ARGS_##nr : "memory", REGISTERS_CLOBBERED_BY_SYSCALL); \ (long int) resultvar; }) # undef INTERNAL_SYSCALL # define INTERNAL_SYSCALL(name, err, nr, args...) \ @@ -240,7 +243,7 @@ asm volatile ( \ "syscall\n\t" \ : "=a" (resultvar) \ - : "0" (name) ASM_ARGS_##nr : "memory", "cc", "r11", "cx"); \ + : "0" (name) ASM_ARGS_##nr : "memory", REGISTERS_CLOBBERED_BY_SYSCALL); \ (long int) resultvar; }) # undef INTERNAL_SYSCALL_TYPES # define INTERNAL_SYSCALL_TYPES(name, err, nr, args...) \