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| author | Andi Kleen <ak@suse.de> | 2005-04-16 15:24:57 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:24:57 -0700 |
| commit | be61bff789fe44bfb6d9282d8f7eccc860bdcfb6 (patch) | |
| tree | 6c11d1fe32e7811c923ca5c7c21b89a78b5dd52f /arch/x86_64 | |
| parent | aa85b9af5bdae1f8b84d80367324e4410c3f0674 (diff) | |
| download | kernel_samsung_smdk4412-be61bff789fe44bfb6d9282d8f7eccc860bdcfb6.tar.gz kernel_samsung_smdk4412-be61bff789fe44bfb6d9282d8f7eccc860bdcfb6.tar.bz2 kernel_samsung_smdk4412-be61bff789fe44bfb6d9282d8f7eccc860bdcfb6.zip | |
[PATCH] x86_64: Some fixes for single step handling
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>
Diffstat (limited to 'arch/x86_64')
| -rw-r--r-- | arch/x86_64/kernel/signal.c | 18 | ||||
| -rw-r--r-- | arch/x86_64/kernel/traps.c | 10 |
2 files changed, 12 insertions, 16 deletions
diff --git a/arch/x86_64/kernel/signal.c b/arch/x86_64/kernel/signal.c index 5ace32c6ac5..4ff0f0117a0 100644 --- a/arch/x86_64/kernel/signal.c +++ b/arch/x86_64/kernel/signal.c @@ -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); diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c index 2707a27b81c..09e4a6460e7 100644 --- a/arch/x86_64/kernel/traps.c +++ b/arch/x86_64/kernel/traps.c @@ -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 */ |