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-rw-r--r--gdb/i386-nat.c316
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diff --git a/gdb/i386-nat.c b/gdb/i386-nat.c
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-/* Native-dependent code for the i386.
-
- Copyright (C) 2001-2014 Free Software Foundation, Inc.
-
- This file is part of GDB.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program 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 General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-#include "defs.h"
-#include "i386-nat.h"
-#include "gdbcmd.h"
-#include "inferior.h"
-
-/* Support for hardware watchpoints and breakpoints using the i386
- debug registers.
-
- This provides several functions for inserting and removing
- hardware-assisted breakpoints and watchpoints, testing if one or
- more of the watchpoints triggered and at what address, checking
- whether a given region can be watched, etc.
-
- The functions below implement debug registers sharing by reference
- counts, and allow to watch regions up to 16 bytes long. */
-
-/* Whether or not to print the mirrored debug registers. */
-int debug_hw_points;
-
-/* Low-level function vector. */
-struct i386_dr_low_type i386_dr_low;
-
-/* Per-process data. We don't bind this to a per-inferior registry
- because of targets like x86 GNU/Linux that need to keep track of
- processes that aren't bound to any inferior (e.g., fork children,
- checkpoints). */
-
-struct i386_process_info
-{
- /* Linked list. */
- struct i386_process_info *next;
-
- /* The process identifier. */
- pid_t pid;
-
- /* Copy of i386 hardware debug registers. */
- struct i386_debug_reg_state state;
-};
-
-static struct i386_process_info *i386_process_list = NULL;
-
-/* Find process data for process PID. */
-
-static struct i386_process_info *
-i386_find_process_pid (pid_t pid)
-{
- struct i386_process_info *proc;
-
- for (proc = i386_process_list; proc; proc = proc->next)
- if (proc->pid == pid)
- return proc;
-
- return NULL;
-}
-
-/* Add process data for process PID. Returns newly allocated info
- object. */
-
-static struct i386_process_info *
-i386_add_process (pid_t pid)
-{
- struct i386_process_info *proc;
-
- proc = xcalloc (1, sizeof (*proc));
- proc->pid = pid;
-
- proc->next = i386_process_list;
- i386_process_list = proc;
-
- return proc;
-}
-
-/* Get data specific info for process PID, creating it if necessary.
- Never returns NULL. */
-
-static struct i386_process_info *
-i386_process_info_get (pid_t pid)
-{
- struct i386_process_info *proc;
-
- proc = i386_find_process_pid (pid);
- if (proc == NULL)
- proc = i386_add_process (pid);
-
- return proc;
-}
-
-/* Get debug registers state for process PID. */
-
-struct i386_debug_reg_state *
-i386_debug_reg_state (pid_t pid)
-{
- return &i386_process_info_get (pid)->state;
-}
-
-/* See declaration in i386-nat.h. */
-
-void
-i386_forget_process (pid_t pid)
-{
- struct i386_process_info *proc, **proc_link;
-
- proc = i386_process_list;
- proc_link = &i386_process_list;
-
- while (proc != NULL)
- {
- if (proc->pid == pid)
- {
- *proc_link = proc->next;
-
- xfree (proc);
- return;
- }
-
- proc_link = &proc->next;
- proc = *proc_link;
- }
-}
-
-/* Clear the reference counts and forget everything we knew about the
- debug registers. */
-
-void
-i386_cleanup_dregs (void)
-{
- /* Starting from scratch has the same effect. */
- i386_forget_process (ptid_get_pid (inferior_ptid));
-}
-
-/* Insert a watchpoint to watch a memory region which starts at
- address ADDR and whose length is LEN bytes. Watch memory accesses
- of the type TYPE. Return 0 on success, -1 on failure. */
-
-static int
-i386_insert_watchpoint (struct target_ops *self,
- CORE_ADDR addr, int len, int type,
- struct expression *cond)
-{
- struct i386_debug_reg_state *state
- = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
-
- return i386_dr_insert_watchpoint (state, type, addr, len);
-}
-
-/* Remove a watchpoint that watched the memory region which starts at
- address ADDR, whose length is LEN bytes, and for accesses of the
- type TYPE. Return 0 on success, -1 on failure. */
-static int
-i386_remove_watchpoint (struct target_ops *self,
- CORE_ADDR addr, int len, int type,
- struct expression *cond)
-{
- struct i386_debug_reg_state *state
- = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
-
- return i386_dr_remove_watchpoint (state, type, addr, len);
-}
-
-/* Return non-zero if we can watch a memory region that starts at
- address ADDR and whose length is LEN bytes. */
-
-static int
-i386_region_ok_for_watchpoint (struct target_ops *self,
- CORE_ADDR addr, int len)
-{
- struct i386_debug_reg_state *state
- = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
-
- return i386_dr_region_ok_for_watchpoint (state, addr, len);
-}
-
-/* If the inferior has some break/watchpoint that triggered, set the
- address associated with that break/watchpoint and return non-zero.
- Otherwise, return zero. */
-
-static int
-i386_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p)
-{
- struct i386_debug_reg_state *state
- = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
-
- return i386_dr_stopped_data_address (state, addr_p);
-}
-
-/* Return non-zero if the inferior has some watchpoint that triggered.
- Otherwise return zero. */
-
-static int
-i386_stopped_by_watchpoint (struct target_ops *ops)
-{
- struct i386_debug_reg_state *state
- = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
-
- return i386_dr_stopped_by_watchpoint (state);
-}
-
-/* Insert a hardware-assisted breakpoint at BP_TGT->placed_address.
- Return 0 on success, EBUSY on failure. */
-
-static int
-i386_insert_hw_breakpoint (struct target_ops *self, struct gdbarch *gdbarch,
- struct bp_target_info *bp_tgt)
-{
- struct i386_debug_reg_state *state
- = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
-
- return i386_dr_insert_watchpoint (state, hw_execute,
- bp_tgt->placed_address, 1) ? EBUSY : 0;
-}
-
-/* Remove a hardware-assisted breakpoint at BP_TGT->placed_address.
- Return 0 on success, -1 on failure. */
-
-static int
-i386_remove_hw_breakpoint (struct target_ops *self, struct gdbarch *gdbarch,
- struct bp_target_info *bp_tgt)
-{
- struct i386_debug_reg_state *state
- = i386_debug_reg_state (ptid_get_pid (inferior_ptid));
-
- return i386_dr_remove_watchpoint (state, hw_execute,
- bp_tgt->placed_address, 1);
-}
-
-/* Returns the number of hardware watchpoints of type TYPE that we can
- set. Value is positive if we can set CNT watchpoints, zero if
- setting watchpoints of type TYPE is not supported, and negative if
- CNT is more than the maximum number of watchpoints of type TYPE
- that we can support. TYPE is one of bp_hardware_watchpoint,
- bp_read_watchpoint, bp_write_watchpoint, or bp_hardware_breakpoint.
- CNT is the number of such watchpoints used so far (including this
- one). OTHERTYPE is non-zero if other types of watchpoints are
- currently enabled.
-
- We always return 1 here because we don't have enough information
- about possible overlap of addresses that they want to watch. As an
- extreme example, consider the case where all the watchpoints watch
- the same address and the same region length: then we can handle a
- virtually unlimited number of watchpoints, due to debug register
- sharing implemented via reference counts in i386-nat.c. */
-
-static int
-i386_can_use_hw_breakpoint (struct target_ops *self,
- int type, int cnt, int othertype)
-{
- return 1;
-}
-
-static void
-add_show_debug_regs_command (void)
-{
- /* A maintenance command to enable printing the internal DRi mirror
- variables. */
- add_setshow_boolean_cmd ("show-debug-regs", class_maintenance,
- &debug_hw_points, _("\
-Set whether to show variables that mirror the x86 debug registers."), _("\
-Show whether to show variables that mirror the x86 debug registers."), _("\
-Use \"on\" to enable, \"off\" to disable.\n\
-If enabled, the debug registers values are shown when GDB inserts\n\
-or removes a hardware breakpoint or watchpoint, and when the inferior\n\
-triggers a breakpoint or watchpoint."),
- NULL,
- NULL,
- &maintenance_set_cmdlist,
- &maintenance_show_cmdlist);
-}
-
-/* There are only two global functions left. */
-
-void
-i386_use_watchpoints (struct target_ops *t)
-{
- /* After a watchpoint trap, the PC points to the instruction after the
- one that caused the trap. Therefore we don't need to step over it.
- But we do need to reset the status register to avoid another trap. */
- t->to_have_continuable_watchpoint = 1;
-
- t->to_can_use_hw_breakpoint = i386_can_use_hw_breakpoint;
- t->to_region_ok_for_hw_watchpoint = i386_region_ok_for_watchpoint;
- t->to_stopped_by_watchpoint = i386_stopped_by_watchpoint;
- t->to_stopped_data_address = i386_stopped_data_address;
- t->to_insert_watchpoint = i386_insert_watchpoint;
- t->to_remove_watchpoint = i386_remove_watchpoint;
- t->to_insert_hw_breakpoint = i386_insert_hw_breakpoint;
- t->to_remove_hw_breakpoint = i386_remove_hw_breakpoint;
-}
-
-void
-i386_set_debug_register_length (int len)
-{
- /* This function should be called only once for each native target. */
- gdb_assert (i386_dr_low.debug_register_length == 0);
- gdb_assert (len == 4 || len == 8);
- i386_dr_low.debug_register_length = len;
- add_show_debug_regs_command ();
-}
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