Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755745AbYG0GwT (ORCPT ); Sun, 27 Jul 2008 02:52:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753283AbYG0GwJ (ORCPT ); Sun, 27 Jul 2008 02:52:09 -0400 Received: from mx1.redhat.com ([66.187.233.31]:35168 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752947AbYG0GwH (ORCPT ); Sun, 27 Jul 2008 02:52:07 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit From: Roland McGrath To: Paul Mackerras , Benjamin Herrenschmidt X-Fcc: ~/Mail/linus Cc: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/5] powerpc: tracehook: asm/syscall.h In-Reply-To: Roland McGrath's message of Saturday, 26 July 2008 23:48:59 -0700 <20080727064859.69692154280@magilla.localdomain> References: <20080727064859.69692154280@magilla.localdomain> X-Windows: sometimes you fill a vacuum and it still sucks. Message-Id: <20080727065135.6A08A154280@magilla.localdomain> Date: Sat, 26 Jul 2008 23:51:35 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3378 Lines: 117 Add asm/syscall.h for powerpc with all the required entry points. This will allow arch-independent tracing code for system calls. Signed-off-by: Roland McGrath --- include/asm-powerpc/ptrace.h | 1 + include/asm-powerpc/syscall.h | 84 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 85 insertions(+), 0 deletions(-) create mode 100644 include/asm-powerpc/syscall.h diff --git a/include/asm-powerpc/ptrace.h b/include/asm-powerpc/ptrace.h index 3d6e310..734e075 100644 --- a/include/asm-powerpc/ptrace.h +++ b/include/asm-powerpc/ptrace.h @@ -84,6 +84,7 @@ struct pt_regs { #ifndef __ASSEMBLY__ #define instruction_pointer(regs) ((regs)->nip) +#define user_stack_pointer(regs) ((regs)->gpr[1]) #define regs_return_value(regs) ((regs)->gpr[3]) #ifdef CONFIG_SMP diff --git a/include/asm-powerpc/syscall.h b/include/asm-powerpc/syscall.h new file mode 100644 index 0000000..3ced23a --- /dev/null +++ b/include/asm-powerpc/syscall.h @@ -0,0 +1,84 @@ +/* + * Access to user system call parameters and results + * + * Copyright (C) 2008 Red Hat, Inc. All rights reserved. + * + * This copyrighted material is made available to anyone wishing to use, + * modify, copy, or redistribute it subject to the terms and conditions + * of the GNU General Public License v.2. + * + * See asm-generic/syscall.h for descriptions of what we must do here. + */ + +#ifndef _ASM_SYSCALL_H +#define _ASM_SYSCALL_H 1 + +#include + +static inline long syscall_get_nr(struct task_struct *task, + struct pt_regs *regs) +{ + return regs->trap == 0xc01 ? regs->gpr[0] : -1L; +} + +static inline void syscall_rollback(struct task_struct *task, + struct pt_regs *regs) +{ + regs->gpr[3] = regs->orig_gpr3; +} + +static inline long syscall_get_error(struct task_struct *task, + struct pt_regs *regs) +{ + return (regs->ccr & 0x1000) ? -regs->gpr[3] : 0; +} + +static inline long syscall_get_return_value(struct task_struct *task, + struct pt_regs *regs) +{ + return regs->gpr[3]; +} + +static inline void syscall_set_return_value(struct task_struct *task, + struct pt_regs *regs, + int error, long val) +{ + if (error) { + regs->ccr |= 0x1000L; + regs->gpr[3] = -error; + } else { + regs->ccr &= ~0x1000L; + regs->gpr[3] = val; + } +} + +static inline void syscall_get_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned int i, unsigned int n, + unsigned long *args) +{ + BUG_ON(i + n > 6); +#ifdef CONFIG_PPC64 + if (test_tsk_thread_flag(task, TIF_32BIT)) { + /* + * Zero-extend 32-bit argument values. The high bits are + * garbage ignored by the actual syscall dispatch. + */ + while (n-- > 0) + args[n] = (u32) regs->gpr[3 + i + n]; + return; + } +#endif + memcpy(args, ®s->gpr[3 + i], n * sizeof(args[0])); +} + +static inline void syscall_set_arguments(struct task_struct *task, + struct pt_regs *regs, + unsigned int i, unsigned int n, + const unsigned long *args) +{ + BUG_ON(i + n > 6); + memcpy(®s->gpr[3 + i], args, n * sizeof(args[0])); +} + +#endif /* _ASM_SYSCALL_H */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/