diff options
| author | Roland McGrath <roland@redhat.com> | 2008-01-30 13:30:54 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:30:54 +0100 |
| commit | 7e9916040b3020d0f36d68bb7512e3b80b623097 (patch) | |
| tree | 7c391bcdb7a5d917b54ae968304e8a951997e16e /include | |
| parent | 0a049bb0ab807b4a95dce9cd0b603c01c199a287 (diff) | |
x86: debugctlmsr context switch
This adds low-level support for a per-thread value of MSR_IA32_DEBUGCTLMSR.
The per-thread value is switched in when TIF_DEBUGCTLMSR is set.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-x86/processor_32.h | 2 | ||||
| -rw-r--r-- | include/asm-x86/processor_64.h | 2 | ||||
| -rw-r--r-- | include/asm-x86/thread_info_32.h | 6 | ||||
| -rw-r--r-- | include/asm-x86/thread_info_64.h | 4 |
4 files changed, 11 insertions, 3 deletions
diff --git a/include/asm-x86/processor_32.h b/include/asm-x86/processor_32.h index 2540bf8d5724..3c67eacb3168 100644 --- a/include/asm-x86/processor_32.h +++ b/include/asm-x86/processor_32.h @@ -368,6 +368,8 @@ struct thread_struct { unsigned long iopl; /* max allowed port in the bitmap, in bytes: */ unsigned long io_bitmap_max; +/* MSR_IA32_DEBUGCTLMSR value to switch in if TIF_DEBUGCTLMSR is set. */ + unsigned long debugctlmsr; }; #define INIT_THREAD { \ diff --git a/include/asm-x86/processor_64.h b/include/asm-x86/processor_64.h index 20d8935d141a..e7bea4fed642 100644 --- a/include/asm-x86/processor_64.h +++ b/include/asm-x86/processor_64.h @@ -238,6 +238,8 @@ struct thread_struct { int ioperm; unsigned long *io_bitmap_ptr; unsigned io_bitmap_max; +/* MSR_IA32_DEBUGCTLMSR value to switch in if TIF_DEBUGCTLMSR is set. */ + unsigned long debugctlmsr; /* cached TLS descriptors. */ u64 tls_array[GDT_ENTRY_TLS_ENTRIES]; } __attribute__((aligned(16))); diff --git a/include/asm-x86/thread_info_32.h b/include/asm-x86/thread_info_32.h index 009ecc6ad38b..306fc80800e1 100644 --- a/include/asm-x86/thread_info_32.h +++ b/include/asm-x86/thread_info_32.h @@ -139,6 +139,7 @@ static inline struct thread_info *current_thread_info(void) #define TIF_FREEZE 19 /* is freezing for suspend */ #define TIF_NOTSC 20 /* TSC is not accessible in userland */ #define TIF_FORCED_TF 21 /* true if TF in eflags artificially */ +#define TIF_DEBUGCTLMSR 22 /* uses thread_struct.debugctlmsr */ #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) @@ -155,6 +156,7 @@ static inline struct thread_info *current_thread_info(void) #define _TIF_FREEZE (1<<TIF_FREEZE) #define _TIF_NOTSC (1<<TIF_NOTSC) #define _TIF_FORCED_TF (1<<TIF_FORCED_TF) +#define _TIF_DEBUGCTLMSR (1<<TIF_DEBUGCTLMSR) /* work to do on interrupt/exception return */ #define _TIF_WORK_MASK \ @@ -164,8 +166,8 @@ static inline struct thread_info *current_thread_info(void) #define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP) /* flags to check in __switch_to() */ -#define _TIF_WORK_CTXSW_NEXT (_TIF_IO_BITMAP | _TIF_NOTSC | _TIF_DEBUG) -#define _TIF_WORK_CTXSW_PREV (_TIF_IO_BITMAP | _TIF_NOTSC) +#define _TIF_WORK_CTXSW_NEXT (_TIF_IO_BITMAP | _TIF_NOTSC | _TIF_DEBUG | _TIF_DEBUGCTLMSR) +#define _TIF_WORK_CTXSW_PREV (_TIF_IO_BITMAP | _TIF_NOTSC | _TIF_DEBUGCTLMSR) /* * Thread-synchronous status. diff --git a/include/asm-x86/thread_info_64.h b/include/asm-x86/thread_info_64.h index e0f41b3deced..ee35fd12b541 100644 --- a/include/asm-x86/thread_info_64.h +++ b/include/asm-x86/thread_info_64.h @@ -122,6 +122,7 @@ static inline struct thread_info *stack_thread_info(void) #define TIF_IO_BITMAP 22 /* uses I/O bitmap */ #define TIF_FREEZE 23 /* is freezing for suspend */ #define TIF_FORCED_TF 24 /* true if TF in eflags artificially */ +#define TIF_DEBUGCTLMSR 25 /* uses thread_struct.debugctlmsr */ #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) @@ -140,6 +141,7 @@ static inline struct thread_info *stack_thread_info(void) #define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP) #define _TIF_FREEZE (1<<TIF_FREEZE) #define _TIF_FORCED_TF (1<<TIF_FORCED_TF) +#define _TIF_DEBUGCTLMSR (1<<TIF_DEBUGCTLMSR) /* work to do on interrupt/exception return */ #define _TIF_WORK_MASK \ @@ -151,7 +153,7 @@ static inline struct thread_info *stack_thread_info(void) (_TIF_SIGPENDING|_TIF_SINGLESTEP|_TIF_MCE_NOTIFY|_TIF_HRTICK_RESCHED) /* flags to check in __switch_to() */ -#define _TIF_WORK_CTXSW (_TIF_DEBUG|_TIF_IO_BITMAP) +#define _TIF_WORK_CTXSW (_TIF_DEBUG|_TIF_IO_BITMAP|_TIF_DEBUGCTLMSR) #define PREEMPT_ACTIVE 0x10000000 |