| /* Copyright (C) 2001, 2003 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #ifndef _SYS_DEBUGREG_H |
| #define _SYS_DEBUGREG_H 1 |
| #include <bits/wordsize.h> |
| |
| /* Indicate the register numbers for a number of the specific |
| debug registers. Registers 0-3 contain the addresses we wish to trap on */ |
| #define DR_FIRSTADDR 0 /* u_debugreg[DR_FIRSTADDR] */ |
| #define DR_LASTADDR 3 /* u_debugreg[DR_LASTADDR] */ |
| |
| #define DR_STATUS 6 /* u_debugreg[DR_STATUS] */ |
| #define DR_CONTROL 7 /* u_debugreg[DR_CONTROL] */ |
| |
| /* Define a few things for the status register. We can use this to determine |
| which debugging register was responsible for the trap. The other bits |
| are either reserved or not of interest to us. */ |
| |
| #define DR_TRAP0 (0x1) /* db0 */ |
| #define DR_TRAP1 (0x2) /* db1 */ |
| #define DR_TRAP2 (0x4) /* db2 */ |
| #define DR_TRAP3 (0x8) /* db3 */ |
| |
| #define DR_STEP (0x4000) /* single-step */ |
| #define DR_SWITCH (0x8000) /* task switch */ |
| |
| /* Now define a bunch of things for manipulating the control register. |
| The top two bytes of the control register consist of 4 fields of 4 |
| bits - each field corresponds to one of the four debug registers, |
| and indicates what types of access we trap on, and how large the data |
| field is that we are looking at */ |
| |
| #define DR_CONTROL_SHIFT 16 /* Skip this many bits in ctl register */ |
| #define DR_CONTROL_SIZE 4 /* 4 control bits per register */ |
| |
| #define DR_RW_EXECUTE (0x0) /* Settings for the access types to trap on */ |
| #define DR_RW_WRITE (0x1) |
| #define DR_RW_READ (0x3) |
| |
| #define DR_LEN_1 (0x0) /* Settings for data length to trap on */ |
| #define DR_LEN_2 (0x4) |
| #define DR_LEN_4 (0xC) |
| #define DR_LEN_8 (0x8) |
| |
| /* The low byte to the control register determine which registers are |
| enabled. There are 4 fields of two bits. One bit is "local", meaning |
| that the processor will reset the bit after a task switch and the other |
| is global meaning that we have to explicitly reset the bit. With linux, |
| you can use either one, since we explicitly zero the register when we enter |
| kernel mode. */ |
| |
| #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_ENABLE_SIZE 2 /* 2 enable bits per register */ |
| |
| #define DR_LOCAL_ENABLE_MASK (0x55) /* Set local bits for all 4 regs */ |
| #define DR_GLOBAL_ENABLE_MASK (0xAA) /* Set global bits for all 4 regs */ |
| |
| /* The second byte to the control register has a few special |
| things. */ |
| |
| |
| |
| #if __WORDSIZE == 64 |
| # define DR_CONTROL_RESERVED (0xFFFFFFFF0000FC00UL) /* Reserved */ |
| #else |
| # define DR_CONTROL_RESERVED (0x00FC00U) /* Reserved */ |
| #endif |
| #define DR_LOCAL_SLOWDOWN (0x100) /* Local slow the pipeline */ |
| #define DR_GLOBAL_SLOWDOWN (0x200) /* Global slow the pipeline */ |
| |
| #endif /* sys/debugreg.h */ |