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[PATCH] x86_64: Some fixes for single step handling

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Ported from i386/Linus

Be more careful with TF handling to fix some copy protection codes in Wine

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2005-04-16 15:24:57 -07:00 committed by Linus Torvalds
parent aa85b9af5b
commit be61bff789
2 changed files with 12 additions and 16 deletions
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18
arch/x86_64/kernel/signal.c
View File

@ -185,7 +185,6 @@ static inline int
setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned long mask, struct task_struct *me)
{
int err = 0;
unsigned long eflags;
err |= __put_user(0, &sc->gs);
err |= __put_user(0, &sc->fs);
@ -209,11 +208,7 @@ setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned lo
err |= __put_user(me->thread.trap_no, &sc->trapno);
err |= __put_user(me->thread.error_code, &sc->err);
err |= __put_user(regs->rip, &sc->rip);
eflags = regs->eflags;
if (current->ptrace & PT_PTRACED) {
eflags &= ~TF_MASK;
}
err |= __put_user(eflags, &sc->eflags);
err |= __put_user(regs->eflags, &sc->eflags);
err |= __put_user(mask, &sc->oldmask);
err |= __put_user(me->thread.cr2, &sc->cr2);
@ -323,14 +318,9 @@ static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
regs->rsp = (unsigned long)frame;
set_fs(USER_DS);
if (regs->eflags & TF_MASK) {
if ((current->ptrace & (PT_PTRACED | PT_DTRACE)) == (PT_PTRACED | PT_DTRACE)) {
ptrace_notify(SIGTRAP);
} else {
regs->eflags &= ~TF_MASK;
}
}
regs->eflags &= ~TF_MASK;
if (test_thread_flag(TIF_SINGLESTEP))
ptrace_notify(SIGTRAP);
#ifdef DEBUG_SIG
printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
current->comm, current->pid, frame, regs->rip, frame->pretcode);

10
arch/x86_64/kernel/traps.c
View File

@ -688,8 +688,14 @@ asmlinkage void *do_debug(struct pt_regs * regs, unsigned long error_code)
*/
if ((regs->cs & 3) == 0)
goto clear_TF_reenable;
if ((tsk->ptrace & (PT_DTRACE|PT_PTRACED)) == PT_DTRACE)
goto clear_TF;
/*
* Was the TF flag set by a debugger? If so, clear it now,
* so that register information is correct.
*/
if (tsk->ptrace & PT_DTRACE) {
regs->eflags &= ~TF_MASK;
tsk->ptrace &= ~PT_DTRACE;
}
}
/* Ok, finally something we can handle */