diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2013-11-04 23:27:13 +0400 |
|---|---|---|
| committer | Oleg Nesterov <oleg@redhat.com> | 2013-11-06 23:00:05 +0400 |
| commit | 8a8de66c4f6ebd0f6d3da026ec24339aa5d1db12 (patch) | |
| tree | 8e8ac183b41f6b1249e819017c93fc24e332a1dd | |
| parent | 736e89d9f782a7dd9a38ecda13b2db916fa72f33 (diff) | |
| download | linux-8a8de66c4f6ebd0f6d3da026ec24339aa5d1db12.tar.xz | |
uprobes: Introduce arch_uprobe->ixol
Currently xol_get_insn_slot() assumes that we should simply copy
arch_uprobe->insn[] which is (ignoring arch_uprobe_analyze_insn)
just the copy of the original insn.
This is not true for arm which needs to create another insn to
execute it out-of-line.
So this patch simply adds the new member, ->ixol into the union.
This doesn't make any difference for x86 and powerpc, but arm
can divorce insn/ixol and initialize the correct xol insn in
arch_uprobe_analyze_insn().
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
| -rw-r--r-- | arch/powerpc/include/asm/uprobes.h | 1 | ||||
| -rw-r--r-- | arch/x86/include/asm/uprobes.h | 5 | ||||
| -rw-r--r-- | kernel/events/uprobes.c | 3 |
3 files changed, 7 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/uprobes.h b/arch/powerpc/include/asm/uprobes.h index b6fc3178372a..75c6ecdb8f37 100644 --- a/arch/powerpc/include/asm/uprobes.h +++ b/arch/powerpc/include/asm/uprobes.h @@ -37,6 +37,7 @@ typedef ppc_opcode_t uprobe_opcode_t; struct arch_uprobe { union { u8 insn[MAX_UINSN_BYTES]; + u8 ixol[MAX_UINSN_BYTES]; u32 ainsn; }; }; diff --git a/arch/x86/include/asm/uprobes.h b/arch/x86/include/asm/uprobes.h index b20b4d68b934..3087ea9c5f2e 100644 --- a/arch/x86/include/asm/uprobes.h +++ b/arch/x86/include/asm/uprobes.h @@ -35,7 +35,10 @@ typedef u8 uprobe_opcode_t; struct arch_uprobe { u16 fixups; - u8 insn[MAX_UINSN_BYTES]; + union { + u8 insn[MAX_UINSN_BYTES]; + u8 ixol[MAX_UINSN_BYTES]; + }; #ifdef CONFIG_X86_64 unsigned long rip_rela_target_address; #endif diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 0012c8ebb098..fbcff61b5099 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1264,7 +1264,8 @@ static unsigned long xol_get_insn_slot(struct uprobe *uprobe) return 0; /* Initialize the slot */ - copy_to_page(area->page, xol_vaddr, uprobe->arch.insn, MAX_UINSN_BYTES); + copy_to_page(area->page, xol_vaddr, + uprobe->arch.ixol, sizeof(uprobe->arch.ixol)); /* * We probably need flush_icache_user_range() but it needs vma. * This should work on supported architectures too. |