linux-kernel - [tip:perf/core] uprobes: Pass probed vaddr to arch_uprobe_analyze

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Message-ID: <tip-7eb9ba5ed312ec6ed9d22259c5da1acb7cf4bd29@git.kernel.org>
Date:	Fri, 8 Jun 2012 07:58:02 -0700
From:	tip-bot for Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
	mingo@...nel.org, jkenisto@...ibm.com, ananth@...ibm.com,
	srikar@...ux.vnet.ibm.com, tglx@...utronix.de
Subject: [tip:perf/core] uprobes:
  Pass probed vaddr to arch_uprobe_analyze_insn()

Commit-ID:  7eb9ba5ed312ec6ed9d22259c5da1acb7cf4bd29
Gitweb:     http://git.kernel.org/tip/7eb9ba5ed312ec6ed9d22259c5da1acb7cf4bd29
Author:     Ananth N Mavinakayanahalli <ananth@...ibm.com>
AuthorDate: Fri, 8 Jun 2012 15:02:57 +0530
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 8 Jun 2012 12:22:27 +0200

uprobes: Pass probed vaddr to arch_uprobe_analyze_insn()

On RISC architectures like powerpc, instructions are fixed size.
Instruction analysis on such platforms is just a matter of
(insn % 4). Pass the vaddr at which the uprobe is to be inserted so
that arch_uprobe_analyze_insn() can flag misaligned registration
requests.

Signed-off-by: Ananth N Mavinakaynahalli <ananth@...ibm.com>
Cc: michael@...erman.id.au
Cc: antonb@...nktux.localdomain
Cc: Paul Mackerras <paulus@...ba.org>
Cc: benh@...nel.crashing.org
Cc: peterz@...radead.org
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: Jim Keniston <jkenisto@...ibm.com>
Cc: oleg@...hat.com
Cc: linuxppc-dev@...ts.ozlabs.org
Link: http://lkml.kernel.org/r/20120608093257.GG13409@in.ibm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/uprobes.h |    2 +-
 arch/x86/kernel/uprobes.c      |    3 ++-
 kernel/events/uprobes.c        |    2 +-
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/uprobes.h b/arch/x86/include/asm/uprobes.h
index 1e9bed1..f3971bb 100644
--- a/arch/x86/include/asm/uprobes.h
+++ b/arch/x86/include/asm/uprobes.h
@@ -48,7 +48,7 @@ struct arch_uprobe_task {
 #endif
 };
 
-extern int  arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm);
+extern int  arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long addr);
 extern int  arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs);
 extern int  arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs);
 extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c
index dc4e910..36fd420 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -409,9 +409,10 @@ static int validate_insn_bits(struct arch_uprobe *auprobe, struct mm_struct *mm,
  * arch_uprobe_analyze_insn - instruction analysis including validity and fixups.
  * @mm: the probed address space.
  * @arch_uprobe: the probepoint information.
+ * @addr: virtual address at which to install the probepoint
  * Return 0 on success or a -ve number on error.
  */
-int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm)
+int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long addr)
 {
 	int ret;
 	struct insn insn;
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 8c5e043..b52376d 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -706,7 +706,7 @@ install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
 		if (is_swbp_insn((uprobe_opcode_t *)uprobe->arch.insn))
 			return -EEXIST;
 
-		ret = arch_uprobe_analyze_insn(&uprobe->arch, mm);
+		ret = arch_uprobe_analyze_insn(&uprobe->arch, mm, addr);
 		if (ret)
 			return ret;
 
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