diff options
Diffstat (limited to 'arch/x86/kernel/process.c')
| -rw-r--r-- | arch/x86/kernel/process.c | 22 |
1 files changed, 6 insertions, 16 deletions
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 5284cd2b577..2275ce5776d 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -17,6 +17,8 @@ #include <asm/uaccess.h> #include <asm/i387.h> #include <asm/ds.h> +#include <asm/debugreg.h> +#include <asm/hw_breakpoint.h> unsigned long idle_halt; EXPORT_SYMBOL(idle_halt); @@ -45,6 +47,8 @@ void free_thread_xstate(struct task_struct *tsk) kmem_cache_free(task_xstate_cachep, tsk->thread.xstate); tsk->thread.xstate = NULL; } + if (unlikely(test_tsk_thread_flag(tsk, TIF_DEBUG))) + flush_thread_hw_breakpoint(tsk); WARN(tsk->thread.ds_ctx, "leaking DS context\n"); } @@ -105,12 +109,8 @@ void flush_thread(void) clear_tsk_thread_flag(tsk, TIF_DEBUG); - tsk->thread.debugreg0 = 0; - tsk->thread.debugreg1 = 0; - tsk->thread.debugreg2 = 0; - tsk->thread.debugreg3 = 0; - tsk->thread.debugreg6 = 0; - tsk->thread.debugreg7 = 0; + if (unlikely(test_tsk_thread_flag(tsk, TIF_DEBUG))) + flush_thread_hw_breakpoint(tsk); memset(tsk->thread.tls_array, 0, sizeof(tsk->thread.tls_array)); /* * Forget coprocessor state.. @@ -192,16 +192,6 @@ void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p, else if (next->debugctlmsr != prev->debugctlmsr) update_debugctlmsr(next->debugctlmsr); - if (test_tsk_thread_flag(next_p, TIF_DEBUG)) { - set_debugreg(next->debugreg0, 0); - set_debugreg(next->debugreg1, 1); - set_debugreg(next->debugreg2, 2); - set_debugreg(next->debugreg3, 3); - /* no 4 and 5 */ - set_debugreg(next->debugreg6, 6); - set_debugreg(next->debugreg7, 7); - } - if (test_tsk_thread_flag(prev_p, TIF_NOTSC) ^ test_tsk_thread_flag(next_p, TIF_NOTSC)) { /* prev and next are different */ |