Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762655AbXK2Aml (ORCPT ); Wed, 28 Nov 2007 19:42:41 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760647AbXK2Ama (ORCPT ); Wed, 28 Nov 2007 19:42:30 -0500 Received: from mx1.redhat.com ([66.187.233.31]:51463 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756953AbXK2Am3 (ORCPT ); Wed, 28 Nov 2007 19:42:29 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit From: Roland McGrath To: Andrew Morton , Linus Torvalds Cc: linux-kernel@vger.kernel.org X-Fcc: ~/Mail/linus Cc: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Subject: [PATCH x86/mm 6/6] x86-64 ia32 ptrace get/putreg32 current task In-Reply-To: Roland McGrath's message of Wednesday, 28 November 2007 16:38:49 -0800 <20071129003849.428E026F8E7@magilla.localdomain> References: <20071129003849.428E026F8E7@magilla.localdomain> X-Shopping-List: (1) Resurgent religious prescriptions (2) Emphatic checks (3) Constant selector brunch (4) Ferocious perversions (5) Spontaneous perspiration Message-Id: <20071129004222.E49AD26F8E7@magilla.localdomain> Date: Wed, 28 Nov 2007 16:42:22 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2417 Lines: 72 This generalizes the getreg32 and putreg32 functions so they can be used on the current task, as well as on a task stopped in TASK_TRACED and switched off. This lays the groundwork to share this code for all kinds of user-mode machine state access, not just ptrace. Signed-off-by: Roland McGrath --- arch/x86/ia32/ptrace32.c | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-) diff --git a/arch/x86/ia32/ptrace32.c b/arch/x86/ia32/ptrace32.c index c52d066..d5663e2 100644 --- a/arch/x86/ia32/ptrace32.c +++ b/arch/x86/ia32/ptrace32.c @@ -48,19 +48,27 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 val) if (val && (val & 3) != 3) return -EIO; child->thread.fsindex = val & 0xffff; + if (child == current) + loadsegment(fs, child->thread.fsindex); break; case offsetof(struct user32, regs.gs): if (val && (val & 3) != 3) return -EIO; child->thread.gsindex = val & 0xffff; + if (child == current) + load_gs_index(child->thread.gsindex); break; case offsetof(struct user32, regs.ds): if (val && (val & 3) != 3) return -EIO; child->thread.ds = val & 0xffff; + if (child == current) + loadsegment(ds, child->thread.ds); break; case offsetof(struct user32, regs.es): child->thread.es = val & 0xffff; + if (child == current) + loadsegment(es, child->thread.ds); break; case offsetof(struct user32, regs.ss): if ((val & 3) != 3) @@ -129,15 +137,23 @@ static int getreg32(struct task_struct *child, unsigned regno, u32 *val) switch (regno) { case offsetof(struct user32, regs.fs): *val = child->thread.fsindex; + if (child == current) + asm("movl %%fs,%0" : "=r" (*val)); break; case offsetof(struct user32, regs.gs): *val = child->thread.gsindex; + if (child == current) + asm("movl %%gs,%0" : "=r" (*val)); break; case offsetof(struct user32, regs.ds): *val = child->thread.ds; + if (child == current) + asm("movl %%ds,%0" : "=r" (*val)); break; case offsetof(struct user32, regs.es): *val = child->thread.es; + if (child == current) + asm("movl %%es,%0" : "=r" (*val)); break; R32(cs, cs); - 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/