From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Rabin Vincent <rabin@rab.in>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Peter Zijlstra <peterz@infradead.org>,
oleg@redhat.com
Subject: Re: [PATCH 3/9] uprobes: allow ignoring of probe hits
Date: Wed, 17 Oct 2012 22:22:18 +0530 [thread overview]
Message-ID: <20121017165218.GG11096@linux.vnet.ibm.com> (raw)
In-Reply-To: <1350242593-17761-3-git-send-email-rabin@rab.in>
> static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp)
> {
> struct mm_struct *mm = current->mm;
> @@ -1469,6 +1474,7 @@ static void handle_swbp(struct pt_regs *regs)
> struct uprobe *uprobe;
> unsigned long bp_vaddr;
> int uninitialized_var(is_swbp);
> + bool ignored = false;
>
> bp_vaddr = uprobe_get_swbp_addr(regs);
> uprobe = find_active_uprobe(bp_vaddr, &is_swbp);
> @@ -1499,6 +1505,12 @@ static void handle_swbp(struct pt_regs *regs)
> goto cleanup_ret;
> }
> utask->active_uprobe = uprobe;
> +
> + if (arch_uprobe_ignore(&uprobe->arch, regs)) {
> + ignored = true;
> + goto cleanup_ret;
> + }
> +
With Oleg's changes, this should become simple. Something like:
if (arch_uprobe_ignore(&uprobe->arch, regs))
goto out;
> handler_chain(uprobe, regs);
> if (uprobe->flags & UPROBE_SKIP_SSTEP && can_skip_sstep(uprobe, regs))
> goto cleanup_ret;
> @@ -1514,7 +1526,7 @@ cleanup_ret:
> utask->active_uprobe = NULL;
> utask->state = UTASK_RUNNING;
> }
> - if (!(uprobe->flags & UPROBE_SKIP_SSTEP))
> + if (!ignored && !(uprobe->flags & UPROBE_SKIP_SSTEP))
>
> /*
> * cannot singlestep; cannot skip instruction;
> --
> 1.7.9.5
>
next prev parent reply other threads:[~2012-10-17 16:51 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-14 19:23 [PATCH 1/9] uprobes: move function declarations out of arch Rabin Vincent
2012-10-14 19:23 ` [PATCH 2/9] uprobes: check for single step support Rabin Vincent
2012-10-17 16:40 ` Srikar Dronamraju
2012-10-17 17:02 ` Oleg Nesterov
2012-10-14 19:23 ` [PATCH 3/9] uprobes: allow ignoring of probe hits Rabin Vincent
2012-10-15 16:52 ` Oleg Nesterov
2012-10-16 20:11 ` Rabin Vincent
2012-10-17 17:35 ` Oleg Nesterov
2012-10-21 18:15 ` Rabin Vincent
2012-10-21 19:40 ` Oleg Nesterov
2012-10-17 16:52 ` Srikar Dronamraju [this message]
2012-10-14 19:23 ` [PATCH 4/9] uprobes: allow arch access to xol slot Rabin Vincent
2012-10-17 17:17 ` Srikar Dronamraju
2012-10-14 19:23 ` [PATCH 5/9] uprobes: allow arch-specific initialization Rabin Vincent
2012-10-18 9:39 ` Srikar Dronamraju
2012-10-14 19:23 ` [PATCH 6/9] uprobes: flush cache after xol write Rabin Vincent
2012-10-15 16:57 ` Oleg Nesterov
2012-10-16 20:29 ` Rabin Vincent
2012-10-25 14:58 ` Oleg Nesterov
2012-10-26 5:52 ` Ananth N Mavinakayanahalli
2012-10-26 16:39 ` Oleg Nesterov
2012-10-29 5:35 ` Ananth N Mavinakayanahalli
2012-11-03 16:33 ` Oleg Nesterov
2012-11-04 14:29 ` Ananth N Mavinakayanahalli
2012-11-14 17:37 ` Oleg Nesterov
2012-10-14 19:23 ` [PATCH 7/9] uprobes: add arch write opcode hook Rabin Vincent
2012-10-14 19:23 ` [PATCH 8/9] ARM: support uprobe handling Rabin Vincent
2012-11-04 10:13 ` Russell King - ARM Linux
2012-11-12 17:26 ` Rabin Vincent
2012-10-14 19:23 ` [PATCH 9/9] ARM: add uprobes support Rabin Vincent
2012-10-15 11:14 ` Dave Martin
2012-10-15 11:44 ` Rabin Vincent
2012-10-15 17:44 ` Dave Martin
2012-10-17 14:50 ` Jon Medhurst (Tixy)
2012-10-21 18:43 ` Rabin Vincent
2012-10-21 18:59 ` Rabin Vincent
2012-10-15 17:31 ` Dave Martin
2012-10-21 18:27 ` Rabin Vincent
2012-10-17 17:54 ` Oleg Nesterov
2012-10-15 17:19 ` [PATCH 1/9] uprobes: move function declarations out of arch Srikar Dronamraju
2012-10-16 20:30 ` Rabin Vincent
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