linux-kernel - [PATCH v2 1/2] uprobes: Pass probed vaddr to arch_uprobe_analyze

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Date:	Fri, 8 Jun 2012 15:02:57 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	linuxppc-dev@...ts.ozlabs.org, lkml <linux-kernel@...r.kernel.org>
Cc:	michael@...erman.id.au, antonb@...nktux.localdomain,
	Paul Mackerras <paulus@...ba.org>, benh@...nel.crashing.org,
	Ingo Molnar <mingo@...e.hu>, peterz@...radead.org,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>, oleg@...hat.com
Subject: [PATCH v2 1/2] uprobes: Pass probed vaddr to
	arch_uprobe_analyze_insn()

From: Ananth N Mavinakayanahalli <ananth@...ibm.com>

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.

Changes in V2:
Pass (unsigned long)addr instead of (loff_t)vaddr to
arch_uprobe_analyze_insn(). We need the loff_t vaddr to take care of
the offset of inode:offset pair for large file sizes on 32bit.

Signed-off-by: Ananth N Mavinakaynahalli <ananth@...ibm.com>
---
 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(-)

Index: linux-3.5-rc1/arch/x86/include/asm/uprobes.h
===================================================================
--- linux-3.5-rc1.orig/arch/x86/include/asm/uprobes.h
+++ linux-3.5-rc1/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);
Index: linux-3.5-rc1/arch/x86/kernel/uprobes.c
===================================================================
--- linux-3.5-rc1.orig/arch/x86/kernel/uprobes.c
+++ linux-3.5-rc1/arch/x86/kernel/uprobes.c
@@ -409,9 +409,10 @@ static int validate_insn_bits(struct arc
  * 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;
Index: linux-3.5-rc1/kernel/events/uprobes.c
===================================================================
--- linux-3.5-rc1.orig/kernel/events/uprobes.c
+++ linux-3.5-rc1/kernel/events/uprobes.c
@@ -697,7 +697,7 @@ install_breakpoint(struct uprobe *uprobe
 		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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