diff options
Diffstat (limited to 'arch/x86/kernel/ptrace_32.c')
| -rw-r--r-- | arch/x86/kernel/ptrace_32.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/x86/kernel/ptrace_32.c b/arch/x86/kernel/ptrace_32.c index b73960885c3..bc7fd802dcc 100644 --- a/arch/x86/kernel/ptrace_32.c +++ b/arch/x86/kernel/ptrace_32.c @@ -104,6 +104,15 @@ static int putreg(struct task_struct *child, break; case EFL: value &= FLAG_MASK; + /* + * If the user value contains TF, mark that + * it was not "us" (the debugger) that set it. + * If not, make sure it stays set if we had. + */ + if (value & X86_EFLAGS_TF) + clear_tsk_thread_flag(child, TIF_FORCED_TF); + else if (test_tsk_thread_flag(child, TIF_FORCED_TF)) + value |= X86_EFLAGS_TF; value |= get_stack_long(child, EFL_OFFSET) & ~FLAG_MASK; break; } @@ -119,6 +128,14 @@ static unsigned long getreg(struct task_struct *child, unsigned long retval = ~0UL; switch (regno >> 2) { + case EFL: + /* + * If the debugger set TF, hide it from the readout. + */ + retval = get_stack_long(child, EFL_OFFSET); + if (test_tsk_thread_flag(child, TIF_FORCED_TF)) + retval &= ~X86_EFLAGS_TF; + break; case GS: retval = child->thread.gs; break; |