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uprobes/x86: Conditionalize the usage of handle_riprel_insn() 

arch_uprobe_analyze_insn() calls handle_riprel_insn() at the start,
but only "0xff" and "default" cases need the UPROBE_FIX_RIP_ logic.
Move the callsite into "default" case and change the "0xff" case to
fall-through.

We are going to add the various hooks to handle the rip-relative
jmp/call instructions (and more), we need this change to enforce the
fact that the new code can not conflict with is_riprel_insn() logic
which, after this change, can only be used by default_xol_ops.

Note: arch_uprobe_abort_xol() still calls handle_riprel_post_xol()
directly. This is fine unless another _xol_ops we may add later will
need to reuse "UPROBE_FIX_RIP_AX|UPROBE_FIX_RIP_CX" bits in ->fixup.
In this case we can add uprobe_xol_ops->abort() hook, which (perhaps)
we will need anyway in the long term.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Jim Keniston <jkenisto@us.ibm.com>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
This commit is contained in:
Oleg Nesterov 2014-03-31 17:24:14 +02:00
parent 8ad8e9d3fd
commit e55848a4f8
1 changed files with 2 additions and 4 deletions
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6
arch/x86/kernel/uprobes.c
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@ -482,8 +482,6 @@ int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm,
* and annotate arch_uprobe->fixups accordingly. To start with, ->fixups
* is either zero or it reflects rip-related fixups.
*/
handle_riprel_insn(auprobe, &insn);
switch (OPCODE1(&insn)) {
case 0x9d: /* popf */
auprobe->fixups |= UPROBE_FIX_SETF;
@ -512,9 +510,9 @@ int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm,
case 4: case 5: /* jmp or ljmp, indirect */
fix_ip = false;
}
break;
/* fall through */
default:
break;
handle_riprel_insn(auprobe, &insn);
}
if (fix_ip)