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117 lines
4.6 KiB
C
117 lines
4.6 KiB
C
/* Misc. low level support for i386.
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Copyright (C) 2009-2012 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Support for hardware watchpoints and breakpoints using the i386
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debug registers.
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This provides several functions for inserting and removing
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hardware-assisted breakpoints and watchpoints, testing if one or
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more of the watchpoints triggered and at what address, checking
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whether a given region can be watched, etc.
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The functions below implement debug registers sharing by reference
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counts, and allow to watch regions up to 16 bytes long
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(32 bytes on 64 bit hosts). */
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/* Debug registers' indices. */
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#define DR_FIRSTADDR 0
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#define DR_LASTADDR 3
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#define DR_NADDR 4 /* The number of debug address registers. */
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#define DR_STATUS 6
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#define DR_CONTROL 7
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/* Global state needed to track h/w watchpoints. */
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struct i386_debug_reg_state
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{
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/* Mirror the inferior's DRi registers. We keep the status and
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control registers separated because they don't hold addresses.
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Note that since we can change these mirrors while threads are
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running, we never trust them to explain a cause of a trap.
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For that, we need to peek directly in the inferior registers. */
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CORE_ADDR dr_mirror[DR_NADDR];
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unsigned dr_status_mirror, dr_control_mirror;
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/* Reference counts for each debug register. */
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int dr_ref_count[DR_NADDR];
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};
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/* Initialize STATE. */
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extern void i386_low_init_dregs (struct i386_debug_reg_state *state);
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/* Insert a watchpoint to watch a memory region which starts at
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address ADDR and whose length is LEN bytes. Watch memory accesses
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of the type TYPE_FROM_PACKET. Return 0 on success, -1 on failure. */
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extern int i386_low_insert_watchpoint (struct i386_debug_reg_state *state,
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char type_from_packet, CORE_ADDR addr,
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int len);
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/* Remove a watchpoint that watched the memory region which starts at
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address ADDR, whose length is LEN bytes, and for accesses of the
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type TYPE_FROM_PACKET. Return 0 on success, -1 on failure. */
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extern int i386_low_remove_watchpoint (struct i386_debug_reg_state *state,
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char type_from_packet, CORE_ADDR addr,
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int len);
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/* Return non-zero if we can watch a memory region that starts at
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address ADDR and whose length is LEN bytes. */
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extern int i386_low_region_ok_for_watchpoint (struct i386_debug_reg_state *state,
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CORE_ADDR addr, int len);
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/* If the inferior has some break/watchpoint that triggered, set the
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address associated with that break/watchpoint and return true.
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Otherwise, return false. */
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extern int i386_low_stopped_data_address (struct i386_debug_reg_state *state,
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CORE_ADDR *addr_p);
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/* Return true if the inferior has some watchpoint that triggered.
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Otherwise return false. */
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extern int i386_low_stopped_by_watchpoint (struct i386_debug_reg_state *state);
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/* Each target needs to provide several low-level functions
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that will be called to insert watchpoints and hardware breakpoints
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into the inferior, remove them, and check their status. These
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functions are:
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i386_dr_low_set_control -- set the debug control (DR7)
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register to a given value
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i386_dr_low_set_addr -- put an address into one debug register
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i386_dr_low_get_status -- return the value of the debug
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status (DR6) register.
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*/
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/* Update the inferior's debug register REGNUM from STATE. */
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extern void i386_dr_low_set_addr (const struct i386_debug_reg_state *state,
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int regnum);
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/* Return the inferior's debug register REGNUM. */
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extern CORE_ADDR i386_dr_low_get_addr (int regnum);
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/* Update the inferior's DR7 debug control register from STATE. */
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extern void i386_dr_low_set_control (const struct i386_debug_reg_state *state);
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/* Return the value of the inferior's DR7 debug control register. */
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extern unsigned i386_dr_low_get_control (void);
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/* Return the value of the inferior's DR6 debug status register. */
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extern unsigned i386_dr_low_get_status (void);
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