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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@in.ibm.com>
Cc: michael@ellerman.id.au
Cc: antonb@thinktux.localdomain
Cc: Paul Mackerras <paulus@samba.org>
Cc: benh@kernel.crashing.org
Cc: peterz@infradead.org
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: oleg@redhat.com
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/20120608093257.GG13409@in.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
wifi-calibration
Ananth N Mavinakayanahalli 2012-06-08 15:02:57 +05:30 committed by Ingo Molnar
parent 70ab7003de
commit 7eb9ba5ed3
3 changed files with 4 additions and 3 deletions
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2
arch/x86/include/asm/uprobes.h
View File

@ -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);

3
arch/x86/kernel/uprobes.c
View File

@ -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;

2
kernel/events/uprobes.c
View File

@ -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;