Commit b50ea74c authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Linus Torvalds

[PATCH] kprobes: clean up resume_execute()

Clean up kprobe's resume_execute() for i386 arch.
Signed-off-by: default avatarMasami Hiramatsu <hiramatu@sdl.hitachi.co.jp>
Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 05cfb614
......@@ -362,10 +362,10 @@ static void __kprobes resume_execution(struct kprobe *p,
struct pt_regs *regs, struct kprobe_ctlblk *kcb)
{
unsigned long *tos = (unsigned long *)&regs->esp;
unsigned long next_eip = 0;
unsigned long copy_eip = (unsigned long)p->ainsn.insn;
unsigned long orig_eip = (unsigned long)p->addr;
regs->eflags &= ~TF_MASK;
switch (p->ainsn.insn[0]) {
case 0x9c: /* pushfl */
*tos &= ~(TF_MASK | IF_MASK);
......@@ -375,9 +375,9 @@ static void __kprobes resume_execution(struct kprobe *p,
case 0xcb:
case 0xc2:
case 0xca:
regs->eflags &= ~TF_MASK;
/* eip is already adjusted, no more changes required*/
return;
case 0xea: /* jmp absolute -- eip is correct */
/* eip is already adjusted, no more changes required */
goto no_change;
case 0xe8: /* call relative - Fix return addr */
*tos = orig_eip + (*tos - copy_eip);
break;
......@@ -385,27 +385,21 @@ static void __kprobes resume_execution(struct kprobe *p,
if ((p->ainsn.insn[1] & 0x30) == 0x10) {
/* call absolute, indirect */
/* Fix return addr; eip is correct. */
next_eip = regs->eip;
*tos = orig_eip + (*tos - copy_eip);
goto no_change;
} else if (((p->ainsn.insn[1] & 0x31) == 0x20) || /* jmp near, absolute indirect */
((p->ainsn.insn[1] & 0x31) == 0x21)) { /* jmp far, absolute indirect */
/* eip is correct. */
next_eip = regs->eip;
goto no_change;
}
break;
case 0xea: /* jmp absolute -- eip is correct */
next_eip = regs->eip;
break;
default:
break;
}
regs->eflags &= ~TF_MASK;
if (next_eip) {
regs->eip = next_eip;
} else {
regs->eip = orig_eip + (regs->eip - copy_eip);
}
regs->eip = orig_eip + (regs->eip - copy_eip);
no_change:
return;
}
/*
......
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