diff options
Diffstat (limited to 'arch/x86_64')
| -rw-r--r-- | arch/x86_64/ia32/ptrace32.c | 4 | ||||
| -rw-r--r-- | arch/x86_64/kernel/ioport.c | 1 | ||||
| -rw-r--r-- | arch/x86_64/kernel/process.c | 73 | ||||
| -rw-r--r-- | arch/x86_64/kernel/ptrace.c | 8 |
4 files changed, 53 insertions, 33 deletions
diff --git a/arch/x86_64/ia32/ptrace32.c b/arch/x86_64/ia32/ptrace32.c index 659c0722f6b..72bf92a9d37 100644 --- a/arch/x86_64/ia32/ptrace32.c +++ b/arch/x86_64/ia32/ptrace32.c @@ -117,6 +117,10 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 val) if ((0x5454 >> ((val >> (16 + 4*i)) & 0xf)) & 1) return -EIO; child->thread.debugreg7 = val; + if (val) + set_tsk_thread_flag(child, TIF_DEBUG); + else + clear_tsk_thread_flag(child, TIF_DEBUG); break; default: diff --git a/arch/x86_64/kernel/ioport.c b/arch/x86_64/kernel/ioport.c index b81614970ec..fe063d3cfe4 100644 --- a/arch/x86_64/kernel/ioport.c +++ b/arch/x86_64/kernel/ioport.c @@ -56,6 +56,7 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on) memset(bitmap, 0xff, IO_BITMAP_BYTES); t->io_bitmap_ptr = bitmap; + set_thread_flag(TIF_IO_BITMAP); } /* diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c index bb6745d13b8..6e0527635b4 100644 --- a/arch/x86_64/kernel/process.c +++ b/arch/x86_64/kernel/process.c @@ -350,6 +350,7 @@ void exit_thread(void) kfree(t->io_bitmap_ptr); t->io_bitmap_ptr = NULL; + clear_thread_flag(TIF_IO_BITMAP); /* * Careful, clear this in the TSS too: */ @@ -369,6 +370,7 @@ void flush_thread(void) if (t->flags & _TIF_IA32) current_thread_info()->status |= TS_COMPAT; } + t->flags &= ~_TIF_DEBUG; tsk->thread.debugreg0 = 0; tsk->thread.debugreg1 = 0; @@ -461,7 +463,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long rsp, asm("mov %%es,%0" : "=m" (p->thread.es)); asm("mov %%ds,%0" : "=m" (p->thread.ds)); - if (unlikely(me->thread.io_bitmap_ptr != NULL)) { + if (unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) { p->thread.io_bitmap_ptr = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL); if (!p->thread.io_bitmap_ptr) { p->thread.io_bitmap_max = 0; @@ -469,6 +471,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long rsp, } memcpy(p->thread.io_bitmap_ptr, me->thread.io_bitmap_ptr, IO_BITMAP_BYTES); + set_tsk_thread_flag(p, TIF_IO_BITMAP); } /* @@ -498,6 +501,40 @@ out: */ #define loaddebug(thread,r) set_debugreg(thread->debugreg ## r, r) +static inline void __switch_to_xtra(struct task_struct *prev_p, + struct task_struct *next_p, + struct tss_struct *tss) +{ + struct thread_struct *prev, *next; + + prev = &prev_p->thread, + next = &next_p->thread; + + if (test_tsk_thread_flag(next_p, TIF_DEBUG)) { + loaddebug(next, 0); + loaddebug(next, 1); + loaddebug(next, 2); + loaddebug(next, 3); + /* no 4 and 5 */ + loaddebug(next, 6); + loaddebug(next, 7); + } + + if (test_tsk_thread_flag(next_p, TIF_IO_BITMAP)) { + /* + * Copy the relevant range of the IO bitmap. + * Normally this is 128 bytes or less: + */ + memcpy(tss->io_bitmap, next->io_bitmap_ptr, + max(prev->io_bitmap_max, next->io_bitmap_max)); + } else if (test_tsk_thread_flag(prev_p, TIF_IO_BITMAP)) { + /* + * Clear any possible leftover bits: + */ + memset(tss->io_bitmap, 0xff, prev->io_bitmap_max); + } +} + /* * switch_to(x,y) should switch tasks from x to y. * @@ -586,37 +623,11 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) task_stack_page(next_p) + THREAD_SIZE - PDA_STACKOFFSET); /* - * Now maybe reload the debug registers + * Now maybe reload the debug registers and handle I/O bitmaps */ - if (unlikely(next->debugreg7)) { - loaddebug(next, 0); - loaddebug(next, 1); - loaddebug(next, 2); - loaddebug(next, 3); - /* no 4 and 5 */ - loaddebug(next, 6); - loaddebug(next, 7); - } - - - /* - * Handle the IO bitmap - */ - if (unlikely(prev->io_bitmap_ptr || next->io_bitmap_ptr)) { - if (next->io_bitmap_ptr) - /* - * Copy the relevant range of the IO bitmap. - * Normally this is 128 bytes or less: - */ - memcpy(tss->io_bitmap, next->io_bitmap_ptr, - max(prev->io_bitmap_max, next->io_bitmap_max)); - else { - /* - * Clear any possible leftover bits: - */ - memset(tss->io_bitmap, 0xff, prev->io_bitmap_max); - } - } + if (unlikely((task_thread_info(next_p)->flags & _TIF_WORK_CTXSW)) + || test_tsk_thread_flag(prev_p, TIF_IO_BITMAP)) + __switch_to_xtra(prev_p, next_p, tss); return prev_p; } diff --git a/arch/x86_64/kernel/ptrace.c b/arch/x86_64/kernel/ptrace.c index 2d50024c9f3..d35ec1bc696 100644 --- a/arch/x86_64/kernel/ptrace.c +++ b/arch/x86_64/kernel/ptrace.c @@ -420,9 +420,13 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) if ((0x5554 >> ((data >> (16 + 4*i)) & 0xf)) & 1) break; if (i == 4) { - child->thread.debugreg7 = data; + child->thread.debugreg7 = data; + if (data) + set_tsk_thread_flag(child, TIF_DEBUG); + else + clear_tsk_thread_flag(child, TIF_DEBUG); ret = 0; - } + } break; } break; |