Add x86 hardware debugging register support

This adds using the x86 hardware debugging registers, either from the kernel
through db_set_hw_watchpoint, or from userland through i386_DEBUG_STATE.
While the kernel is using the registers, the userland values are ignored.

* i386/i386/db_interface.c (kernel_dr, ids): New variables.
(db_load_context, db_get_debug_state, db_set_debug_state, db_dr,
db_set_hw_watchpoint): New functions.
(kdb_trap): Use get_dr* instead of dr_addr[].
* i386/i386/db_interface.h (db_user_to_kernel_address, db_set_hw_watchpoint)
(db_dr, db_get_debug_state, db_set_debug_state, db_load_context): Add functions
prototypes.
(dr0, dr1, dr2, dr3): Remove functions prototypes.
* i386/i386/locore.S (dr6, dr0, dr1, dr2, dr3): Remove functions.
(dr_msk, dr_addr): Remove variables.
* i386/include/mach/i386/thread_status.h (i386_DEBUG_STATE): Add macro.
(i386_debug_state): Add structure.
(i386_DEBUG_STATE_COUNT): Add macro.
* i386/i386/thread.h: Include <mach/machine/thread_status.h>.
(i386_machine_state): Add `struct i386_debug_state ids' field.
* i386/i386/pcb.c: Include <i386/db_interface.h>.
(switch_ktss): Call db_load_context.
(thread_setstatus, thread_getstatus): Add I386_DEBUG_STATE case.
* i386/i386/proc_reg.h (get_dr0, set_dr0, get_dr1, set_dr1, get_dr2,
set_dr2, get_dr3, set_dr3, get_dr6, set_dr6, get_dr7, set_dr7): Add macros.

0 files changed, 0 insertions, 0 deletions