This patch introduces debug registers to used by the per-thread structure and wrapper routines to manage debug registers by process-related functions. Signed-off-by: K.Prasad Signed-off-by: Alan Stern --- arch/x86/include/asm/debugreg.h | 23 +++++++++++++++++++++++ arch/x86/include/asm/processor.h | 16 +++++++++------- 2 files changed, 32 insertions(+), 7 deletions(-) Index: linux-2.6-tip/arch/x86/include/asm/debugreg.h =================================================================== --- linux-2.6-tip.orig/arch/x86/include/asm/debugreg.h +++ linux-2.6-tip/arch/x86/include/asm/debugreg.h @@ -49,6 +49,8 @@ #define DR_LOCAL_ENABLE_SHIFT 0 /* Extra shift to the local enable bit */ #define DR_GLOBAL_ENABLE_SHIFT 1 /* Extra shift to the global enable bit */ +#define DR_LOCAL_ENABLE (0x1) /* Local enable for reg 0 */ +#define DR_GLOBAL_ENABLE (0x2) /* Global enable for reg 0 */ #define DR_ENABLE_SIZE 2 /* 2 enable bits per register */ #define DR_LOCAL_ENABLE_MASK (0x55) /* Set local bits for all 4 regs */ @@ -67,4 +69,25 @@ #define DR_LOCAL_SLOWDOWN (0x100) /* Local slow the pipeline */ #define DR_GLOBAL_SLOWDOWN (0x200) /* Global slow the pipeline */ +/* + * HW breakpoint additions + */ +#ifdef __KERNEL__ + +/* For process management */ +void flush_thread_hw_breakpoint(struct task_struct *tsk); +int copy_thread_hw_breakpoint(struct task_struct *tsk, + struct task_struct *child, unsigned long clone_flags); +void dump_thread_hw_breakpoint(struct task_struct *tsk, int u_debugreg[8]); +void switch_to_thread_hw_breakpoint(struct task_struct *tsk); + +/* For CPU management */ +void load_debug_registers(void); +static inline void hw_breakpoint_disable(void) +{ + set_debugreg(0UL, 7); +} + +#endif /* __KERNEL__ */ + #endif /* _ASM_X86_DEBUGREG_H */ Index: linux-2.6-tip/arch/x86/include/asm/processor.h =================================================================== --- linux-2.6-tip.orig/arch/x86/include/asm/processor.h +++ linux-2.6-tip/arch/x86/include/asm/processor.h @@ -29,6 +29,7 @@ struct mm_struct; #include #include +#define HB_NUM 4 /* * Default implementation of macro that returns current * instruction pointer ("program counter"). @@ -424,13 +425,14 @@ struct thread_struct { unsigned long ip; unsigned long fs; unsigned long gs; - /* Hardware debugging registers: */ - unsigned long debugreg0; - unsigned long debugreg1; - unsigned long debugreg2; - unsigned long debugreg3; - unsigned long debugreg6; - unsigned long debugreg7; + /* Hardware breakpoint info */ + struct hw_breakpoint *hbp[HB_NUM]; + unsigned int hbp_num_installed; + /* Thread's view of debug reg 6 */ + unsigned long dr6; + /* Thread's view of debug reg 7 */ + unsigned long dr7; + /* Fault info: */ unsigned long cr2; unsigned long trap_no; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/