From: "Andi Kleen" Ported from i386/Linus Be more careful with TF handling to fix some copy protection codes in Wine Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton --- 25-akpm/arch/x86_64/kernel/signal.c | 18 ++++-------------- 25-akpm/arch/x86_64/kernel/traps.c | 10 ++++++++-- 2 files changed, 12 insertions(+), 16 deletions(-) diff -puN arch/x86_64/kernel/signal.c~x86_64-some-fixes-for-single-step-handling arch/x86_64/kernel/signal.c --- 25/arch/x86_64/kernel/signal.c~x86_64-some-fixes-for-single-step-handling Thu Apr 7 15:10:41 2005 +++ 25-akpm/arch/x86_64/kernel/signal.c Thu Apr 7 15:10:41 2005 @@ -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 __use 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, stru 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); diff -puN arch/x86_64/kernel/traps.c~x86_64-some-fixes-for-single-step-handling arch/x86_64/kernel/traps.c --- 25/arch/x86_64/kernel/traps.c~x86_64-some-fixes-for-single-step-handling Thu Apr 7 15:10:41 2005 +++ 25-akpm/arch/x86_64/kernel/traps.c Thu Apr 7 15:10:41 2005 @@ -688,8 +688,14 @@ asmlinkage void *do_debug(struct pt_regs */ 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 */ _