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aarch64: Add an aarch64_nat_target mixin class.

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This class includes platform-independent target methods for hardware
breakpoints and watchpoints using routines from
nat/aarch64-hw-point.c.

stopped_data_address is not platform-independent since the FAR
register holding the address for a breakpoint hit must be fetched in a
platform-specific manner.  However, aarch64_stopped_data_address is
provided as a helper routine which performs platform-independent
validation given the value of the FAR register.

For tracking the per-process debug register mirror state, use an
unordered_map indexed by pid as recently adopted in x86-nat.c rather
than a manual linked-list.
This commit is contained in:
John Baldwin
2022-03-22 12:05:43 -07:00
parent 4bd817e71e
commit 1570c37c34
4 changed files with 418 additions and 351 deletions
Download Patch File Download Diff File Expand all files Collapse all files

356
gdb/aarch64-linux-nat.c
View File

@ -27,6 +27,7 @@
#include "target-descriptions.h" #include "target-descriptions.h"
#include "auxv.h" #include "auxv.h"
#include "gdbcmd.h" #include "gdbcmd.h"
#include "aarch64-nat.h"
#include "aarch64-tdep.h" #include "aarch64-tdep.h"
#include "aarch64-linux-tdep.h" #include "aarch64-linux-tdep.h"
#include "aarch32-linux-nat.h" #include "aarch32-linux-nat.h"
@ -58,7 +59,8 @@
#define TRAP_HWBKPT 0x0004 #define TRAP_HWBKPT 0x0004
#endif #endif
class aarch64_linux_nat_target final : public linux_nat_target class aarch64_linux_nat_target final
: public aarch64_nat_target<linux_nat_target>
{ {
public: public:
/* Add our register access methods. */ /* Add our register access methods. */
@ -68,17 +70,8 @@ public:
const struct target_desc *read_description () override; const struct target_desc *read_description () override;
/* Add our hardware breakpoint and watchpoint implementation. */ /* Add our hardware breakpoint and watchpoint implementation. */
int can_use_hw_breakpoint (enum bptype, int, int) override;
int insert_hw_breakpoint (struct gdbarch *, struct bp_target_info *) override;
int remove_hw_breakpoint (struct gdbarch *, struct bp_target_info *) override;
int region_ok_for_hw_watchpoint (CORE_ADDR, int) override;
int insert_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
struct expression *) override;
int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
struct expression *) override;
bool stopped_by_watchpoint () override; bool stopped_by_watchpoint () override;
bool stopped_data_address (CORE_ADDR *) override; bool stopped_data_address (CORE_ADDR *) override;
bool watchpoint_addr_within_range (CORE_ADDR, CORE_ADDR, int) override;
int can_do_single_step () override; int can_do_single_step () override;
@ -118,103 +111,13 @@ public:
static aarch64_linux_nat_target the_aarch64_linux_nat_target; static aarch64_linux_nat_target the_aarch64_linux_nat_target;
/* 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 aarch64_process_info
{
/* Linked list. */
struct aarch64_process_info *next;
/* The process identifier. */
pid_t pid;
/* Copy of aarch64 hardware debug registers. */
struct aarch64_debug_reg_state state;
};
static struct aarch64_process_info *aarch64_process_list = NULL;
/* Find process data for process PID. */
static struct aarch64_process_info *
aarch64_find_process_pid (pid_t pid)
{
struct aarch64_process_info *proc;
for (proc = aarch64_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 aarch64_process_info *
aarch64_add_process (pid_t pid)
{
struct aarch64_process_info *proc;
proc = XCNEW (struct aarch64_process_info);
proc->pid = pid;
proc->next = aarch64_process_list;
aarch64_process_list = proc;
return proc;
}
/* Get data specific info for process PID, creating it if necessary.
Never returns NULL. */
static struct aarch64_process_info *
aarch64_process_info_get (pid_t pid)
{
struct aarch64_process_info *proc;
proc = aarch64_find_process_pid (pid);
if (proc == NULL)
proc = aarch64_add_process (pid);
return proc;
}
/* Called whenever GDB is no longer debugging process PID. It deletes /* Called whenever GDB is no longer debugging process PID. It deletes
data structures that keep track of debug register state. */ data structures that keep track of debug register state. */
void void
aarch64_linux_nat_target::low_forget_process (pid_t pid) aarch64_linux_nat_target::low_forget_process (pid_t pid)
{ {
struct aarch64_process_info *proc, **proc_link; aarch64_remove_debug_reg_state (pid);
proc = aarch64_process_list;
proc_link = &aarch64_process_list;
while (proc != NULL)
{
if (proc->pid == pid)
{
*proc_link = proc->next;
xfree (proc);
return;
}
proc_link = &proc->next;
proc = *proc_link;
}
}
/* Get debug registers state for process PID. */
struct aarch64_debug_reg_state *
aarch64_get_debug_reg_state (pid_t pid)
{
return &aarch64_process_info_get (pid)->state;
} }
/* Fill GDB's register array with the general-purpose register values /* Fill GDB's register array with the general-purpose register values
@ -775,192 +678,12 @@ aarch64_linux_nat_target::low_siginfo_fixup (siginfo_t *native, gdb_byte *inf,
return false; return false;
} }
/* 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. */
int
aarch64_linux_nat_target::can_use_hw_breakpoint (enum bptype type,
int cnt, int othertype)
{
if (type == bp_hardware_watchpoint || type == bp_read_watchpoint
|| type == bp_access_watchpoint || type == bp_watchpoint)
{
if (aarch64_num_wp_regs == 0)
return 0;
}
else if (type == bp_hardware_breakpoint)
{
if (aarch64_num_bp_regs == 0)
return 0;
}
else
gdb_assert_not_reached ("unexpected breakpoint type");
/* 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. */
return 1;
}
/* Insert a hardware-assisted breakpoint at BP_TGT->reqstd_address.
Return 0 on success, -1 on failure. */
int
aarch64_linux_nat_target::insert_hw_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
int ret;
CORE_ADDR addr = bp_tgt->placed_address = bp_tgt->reqstd_address;
int len;
const enum target_hw_bp_type type = hw_execute;
struct aarch64_debug_reg_state *state
= aarch64_get_debug_reg_state (inferior_ptid.pid ());
gdbarch_breakpoint_from_pc (gdbarch, &addr, &len);
if (show_debug_regs)
fprintf_unfiltered
(gdb_stdlog,
"insert_hw_breakpoint on entry (addr=0x%08lx, len=%d))\n",
(unsigned long) addr, len);
ret = aarch64_handle_breakpoint (type, addr, len, 1 /* is_insert */,
inferior_ptid, state);
if (show_debug_regs)
{
aarch64_show_debug_reg_state (state,
"insert_hw_breakpoint", addr, len, type);
}
return ret;
}
/* Remove a hardware-assisted breakpoint at BP_TGT->placed_address.
Return 0 on success, -1 on failure. */
int
aarch64_linux_nat_target::remove_hw_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
int ret;
CORE_ADDR addr = bp_tgt->placed_address;
int len = 4;
const enum target_hw_bp_type type = hw_execute;
struct aarch64_debug_reg_state *state
= aarch64_get_debug_reg_state (inferior_ptid.pid ());
gdbarch_breakpoint_from_pc (gdbarch, &addr, &len);
if (show_debug_regs)
fprintf_unfiltered
(gdb_stdlog, "remove_hw_breakpoint on entry (addr=0x%08lx, len=%d))\n",
(unsigned long) addr, len);
ret = aarch64_handle_breakpoint (type, addr, len, 0 /* is_insert */,
inferior_ptid, state);
if (show_debug_regs)
{
aarch64_show_debug_reg_state (state,
"remove_hw_watchpoint", addr, len, type);
}
return ret;
}
/* Implement the "insert_watchpoint" target_ops method.
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. */
int
aarch64_linux_nat_target::insert_watchpoint (CORE_ADDR addr, int len,
enum target_hw_bp_type type,
struct expression *cond)
{
int ret;
struct aarch64_debug_reg_state *state
= aarch64_get_debug_reg_state (inferior_ptid.pid ());
if (show_debug_regs)
fprintf_unfiltered (gdb_stdlog,
"insert_watchpoint on entry (addr=0x%08lx, len=%d)\n",
(unsigned long) addr, len);
gdb_assert (type != hw_execute);
ret = aarch64_handle_watchpoint (type, addr, len, 1 /* is_insert */,
inferior_ptid, state);
if (show_debug_regs)
{
aarch64_show_debug_reg_state (state,
"insert_watchpoint", addr, len, type);
}
return ret;
}
/* Implement the "remove_watchpoint" target_ops method.
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. */
int
aarch64_linux_nat_target::remove_watchpoint (CORE_ADDR addr, int len,
enum target_hw_bp_type type,
struct expression *cond)
{
int ret;
struct aarch64_debug_reg_state *state
= aarch64_get_debug_reg_state (inferior_ptid.pid ());
if (show_debug_regs)
fprintf_unfiltered (gdb_stdlog,
"remove_watchpoint on entry (addr=0x%08lx, len=%d)\n",
(unsigned long) addr, len);
gdb_assert (type != hw_execute);
ret = aarch64_handle_watchpoint (type, addr, len, 0 /* is_insert */,
inferior_ptid, state);
if (show_debug_regs)
{
aarch64_show_debug_reg_state (state,
"remove_watchpoint", addr, len, type);
}
return ret;
}
/* Implement the "region_ok_for_hw_watchpoint" target_ops method. */
int
aarch64_linux_nat_target::region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
{
return aarch64_region_ok_for_watchpoint (addr, len);
}
/* Implement the "stopped_data_address" target_ops method. */ /* Implement the "stopped_data_address" target_ops method. */
bool bool
aarch64_linux_nat_target::stopped_data_address (CORE_ADDR *addr_p) aarch64_linux_nat_target::stopped_data_address (CORE_ADDR *addr_p)
{ {
siginfo_t siginfo; siginfo_t siginfo;
int i;
struct aarch64_debug_reg_state *state; struct aarch64_debug_reg_state *state;
if (!linux_nat_get_siginfo (inferior_ptid, &siginfo)) if (!linux_nat_get_siginfo (inferior_ptid, &siginfo))
@ -980,44 +703,7 @@ aarch64_linux_nat_target::stopped_data_address (CORE_ADDR *addr_p)
/* Check if the address matches any watched address. */ /* Check if the address matches any watched address. */
state = aarch64_get_debug_reg_state (inferior_ptid.pid ()); state = aarch64_get_debug_reg_state (inferior_ptid.pid ());
for (i = aarch64_num_wp_regs - 1; i >= 0; --i) return aarch64_stopped_data_address (state, addr_trap, addr_p);
{
const unsigned int offset
= aarch64_watchpoint_offset (state->dr_ctrl_wp[i]);
const unsigned int len = aarch64_watchpoint_length (state->dr_ctrl_wp[i]);
const CORE_ADDR addr_watch = state->dr_addr_wp[i] + offset;
const CORE_ADDR addr_watch_aligned = align_down (state->dr_addr_wp[i], 8);
const CORE_ADDR addr_orig = state->dr_addr_orig_wp[i];
if (state->dr_ref_count_wp[i]
&& DR_CONTROL_ENABLED (state->dr_ctrl_wp[i])
&& addr_trap >= addr_watch_aligned
&& addr_trap < addr_watch + len)
{
/* ADDR_TRAP reports the first address of the memory range
accessed by the CPU, regardless of what was the memory
range watched. Thus, a large CPU access that straddles
the ADDR_WATCH..ADDR_WATCH+LEN range may result in an
ADDR_TRAP that is lower than the
ADDR_WATCH..ADDR_WATCH+LEN range. E.g.:
addr: | 4 | 5 | 6 | 7 | 8 |
|---- range watched ----|
|----------- range accessed ------------|
In this case, ADDR_TRAP will be 4.
To match a watchpoint known to GDB core, we must never
report *ADDR_P outside of any ADDR_WATCH..ADDR_WATCH+LEN
range. ADDR_WATCH <= ADDR_TRAP < ADDR_ORIG is a false
positive on kernels older than 4.10. See PR
external/20207. */
*addr_p = addr_orig;
return true;
}
}
return false;
} }
/* Implement the "stopped_by_watchpoint" target_ops method. */ /* Implement the "stopped_by_watchpoint" target_ops method. */
@ -1030,15 +716,6 @@ aarch64_linux_nat_target::stopped_by_watchpoint ()
return stopped_data_address (&addr); return stopped_data_address (&addr);
} }
/* Implement the "watchpoint_addr_within_range" target_ops method. */
bool
aarch64_linux_nat_target::watchpoint_addr_within_range (CORE_ADDR addr,
CORE_ADDR start, int length)
{
return start <= addr && start + length - 1 >= addr;
}
/* Implement the "can_do_single_step" target_ops method. */ /* Implement the "can_do_single_step" target_ops method. */
int int
@ -1114,32 +791,11 @@ aarch64_linux_nat_target::store_memtags (CORE_ADDR address, size_t len,
return false; return false;
} }
/* Define AArch64 maintenance commands. */
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,
&show_debug_regs, _("\
Set whether to show variables that mirror the AArch64 debug registers."), _("\
Show whether to show variables that mirror the AArch64 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);
}
void _initialize_aarch64_linux_nat (); void _initialize_aarch64_linux_nat ();
void void
_initialize_aarch64_linux_nat () _initialize_aarch64_linux_nat ()
{ {
add_show_debug_regs_command (); aarch64_initialize_hw_point ();
/* Register the target. */ /* Register the target. */
linux_target = &the_aarch64_linux_nat_target; linux_target = &the_aarch64_linux_nat_target;

302
gdb/aarch64-nat.c Normal file
View File

@ -0,0 +1,302 @@
/* Native-dependent code for AArch64.
Copyright (C) 2011-2022 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 "gdbarch.h"
#include "inferior.h"
#include "cli/cli-cmds.h"
#include "aarch64-nat.h"
#include <unordered_map>
/* Hash table storing 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). */
static std::unordered_map<pid_t, aarch64_debug_reg_state>
aarch64_debug_process_state;
/* See aarch64-nat.h. */
struct aarch64_debug_reg_state *
aarch64_lookup_debug_reg_state (pid_t pid)
{
auto it = aarch64_debug_process_state.find (pid);
if (it != aarch64_debug_process_state.end ())
return &it->second;
return nullptr;
}
/* See aarch64-nat.h. */
struct aarch64_debug_reg_state *
aarch64_get_debug_reg_state (pid_t pid)
{
return &aarch64_debug_process_state[pid];
}
/* See aarch64-nat.h. */
void
aarch64_remove_debug_reg_state (pid_t pid)
{
aarch64_debug_process_state.erase (pid);
}
/* 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. */
int
aarch64_can_use_hw_breakpoint (enum bptype type, int cnt, int othertype)
{
if (type == bp_hardware_watchpoint || type == bp_read_watchpoint
|| type == bp_access_watchpoint || type == bp_watchpoint)
{
if (aarch64_num_wp_regs == 0)
return 0;
}
else if (type == bp_hardware_breakpoint)
{
if (aarch64_num_bp_regs == 0)
return 0;
}
else
gdb_assert_not_reached ("unexpected breakpoint type");
/* 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. */
return 1;
}
/* Insert a hardware-assisted breakpoint at BP_TGT->reqstd_address.
Return 0 on success, -1 on failure. */
int
aarch64_insert_hw_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
int ret;
CORE_ADDR addr = bp_tgt->placed_address = bp_tgt->reqstd_address;
int len;
const enum target_hw_bp_type type = hw_execute;
struct aarch64_debug_reg_state *state
= aarch64_get_debug_reg_state (inferior_ptid.pid ());
gdbarch_breakpoint_from_pc (gdbarch, &addr, &len);
if (show_debug_regs)
fprintf_unfiltered
(gdb_stdlog,
"insert_hw_breakpoint on entry (addr=0x%08lx, len=%d))\n",
(unsigned long) addr, len);
ret = aarch64_handle_breakpoint (type, addr, len, 1 /* is_insert */,
inferior_ptid, state);
if (show_debug_regs)
{
aarch64_show_debug_reg_state (state,
"insert_hw_breakpoint", addr, len, type);
}
return ret;
}
/* Remove a hardware-assisted breakpoint at BP_TGT->placed_address.
Return 0 on success, -1 on failure. */
int
aarch64_remove_hw_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
int ret;
CORE_ADDR addr = bp_tgt->placed_address;
int len = 4;
const enum target_hw_bp_type type = hw_execute;
struct aarch64_debug_reg_state *state
= aarch64_get_debug_reg_state (inferior_ptid.pid ());
gdbarch_breakpoint_from_pc (gdbarch, &addr, &len);
if (show_debug_regs)
fprintf_unfiltered
(gdb_stdlog, "remove_hw_breakpoint on entry (addr=0x%08lx, len=%d))\n",
(unsigned long) addr, len);
ret = aarch64_handle_breakpoint (type, addr, len, 0 /* is_insert */,
inferior_ptid, state);
if (show_debug_regs)
{
aarch64_show_debug_reg_state (state,
"remove_hw_watchpoint", addr, len, type);
}
return ret;
}
/* 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. */
int
aarch64_insert_watchpoint (CORE_ADDR addr, int len, enum target_hw_bp_type type,
struct expression *cond)
{
int ret;
struct aarch64_debug_reg_state *state
= aarch64_get_debug_reg_state (inferior_ptid.pid ());
if (show_debug_regs)
fprintf_unfiltered (gdb_stdlog,
"insert_watchpoint on entry (addr=0x%08lx, len=%d)\n",
(unsigned long) addr, len);
gdb_assert (type != hw_execute);
ret = aarch64_handle_watchpoint (type, addr, len, 1 /* is_insert */,
inferior_ptid, state);
if (show_debug_regs)
{
aarch64_show_debug_reg_state (state,
"insert_watchpoint", addr, len, type);
}
return ret;
}
/* 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. */
int
aarch64_remove_watchpoint (CORE_ADDR addr, int len, enum target_hw_bp_type type,
struct expression *cond)
{
int ret;
struct aarch64_debug_reg_state *state
= aarch64_get_debug_reg_state (inferior_ptid.pid ());
if (show_debug_regs)
fprintf_unfiltered (gdb_stdlog,
"remove_watchpoint on entry (addr=0x%08lx, len=%d)\n",
(unsigned long) addr, len);
gdb_assert (type != hw_execute);
ret = aarch64_handle_watchpoint (type, addr, len, 0 /* is_insert */,
inferior_ptid, state);
if (show_debug_regs)
{
aarch64_show_debug_reg_state (state,
"remove_watchpoint", addr, len, type);
}
return ret;
}
/* See aarch64-nat.h. */
bool
aarch64_stopped_data_address (const struct aarch64_debug_reg_state *state,
CORE_ADDR addr_trap, CORE_ADDR *addr_p)
{
int i;
for (i = aarch64_num_wp_regs - 1; i >= 0; --i)
{
const unsigned int offset
= aarch64_watchpoint_offset (state->dr_ctrl_wp[i]);
const unsigned int len = aarch64_watchpoint_length (state->dr_ctrl_wp[i]);
const CORE_ADDR addr_watch = state->dr_addr_wp[i] + offset;
const CORE_ADDR addr_watch_aligned = align_down (state->dr_addr_wp[i], 8);
const CORE_ADDR addr_orig = state->dr_addr_orig_wp[i];
if (state->dr_ref_count_wp[i]
&& DR_CONTROL_ENABLED (state->dr_ctrl_wp[i])
&& addr_trap >= addr_watch_aligned
&& addr_trap < addr_watch + len)
{
/* ADDR_TRAP reports the first address of the memory range
accessed by the CPU, regardless of what was the memory
range watched. Thus, a large CPU access that straddles
the ADDR_WATCH..ADDR_WATCH+LEN range may result in an
ADDR_TRAP that is lower than the
ADDR_WATCH..ADDR_WATCH+LEN range. E.g.:
addr: | 4 | 5 | 6 | 7 | 8 |
|---- range watched ----|
|----------- range accessed ------------|
In this case, ADDR_TRAP will be 4.
To match a watchpoint known to GDB core, we must never
report *ADDR_P outside of any ADDR_WATCH..ADDR_WATCH+LEN
range. ADDR_WATCH <= ADDR_TRAP < ADDR_ORIG is a false
positive on kernels older than 4.10. See PR
external/20207. */
*addr_p = addr_orig;
return true;
}
}
return false;
}
/* Define AArch64 maintenance commands. */
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,
&show_debug_regs, _("\
Set whether to show variables that mirror the AArch64 debug registers."), _("\
Show whether to show variables that mirror the AArch64 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);
}
void
aarch64_initialize_hw_point ()
{
add_show_debug_regs_command ();
}

109
gdb/aarch64-nat.h Normal file
View File

@ -0,0 +1,109 @@
/* Native-dependent code for AArch64.
Copyright (C) 2011-2022 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/>. */
#ifndef AARCH64_NAT_H
#define AARCH64_NAT_H
#include "breakpoint.h"
#include "nat/aarch64-hw-point.h"
#include "target.h"
/* Hardware-assisted breakpoints and watchpoints. */
/* Initialize platform-independent state for hardware-assisted
breakpoints and watchpoints. */
void aarch64_initialize_hw_point ();
/* Return the debug register state for process PID. If no existing
state is found for this process, return nullptr. */
struct aarch64_debug_reg_state *aarch64_lookup_debug_reg_state (pid_t pid);
/* Return the debug register state for process PID. If no existing
state is found for this process, create new state. */
struct aarch64_debug_reg_state *aarch64_get_debug_reg_state (pid_t pid);
/* Remove any existing per-process debug state for process PID. */
void aarch64_remove_debug_reg_state (pid_t pid);
/* Helper for the "stopped_data_address" target method. Returns TRUE
if a hardware watchpoint trap at ADDR_TRAP matches a set
watchpoint. The address of the matched watchpoint is returned in
*ADDR_P. */
bool aarch64_stopped_data_address (const struct aarch64_debug_reg_state *state,
CORE_ADDR addr_trap, CORE_ADDR *addr_p);
/* Helper functions used by aarch64_nat_target below. See their
definitions. */
int aarch64_can_use_hw_breakpoint (enum bptype type, int cnt, int othertype);
int aarch64_insert_watchpoint (CORE_ADDR addr, int len,
enum target_hw_bp_type type,
struct expression *cond);
int aarch64_remove_watchpoint (CORE_ADDR addr, int len,
enum target_hw_bp_type type,
struct expression *cond);
int aarch64_insert_hw_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt);
int aarch64_remove_hw_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt);
int aarch64_stopped_by_hw_breakpoint ();
/* Convenience template mixin used to add aarch64 watchpoints support to a
target. */
template <typename BaseTarget>
struct aarch64_nat_target : public BaseTarget
{
/* Hook in common aarch64 hardware watchpoints/breakpoints support. */
int can_use_hw_breakpoint (enum bptype type, int cnt, int othertype) override
{ return aarch64_can_use_hw_breakpoint (type, cnt, othertype); }
int region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) override
{ return aarch64_region_ok_for_watchpoint (addr, len); }
int insert_watchpoint (CORE_ADDR addr, int len,
enum target_hw_bp_type type,
struct expression *cond) override
{ return aarch64_insert_watchpoint (addr, len, type, cond); }
int remove_watchpoint (CORE_ADDR addr, int len,
enum target_hw_bp_type type,
struct expression *cond) override
{ return aarch64_remove_watchpoint (addr, len, type, cond); }
int insert_hw_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt) override
{ return aarch64_insert_hw_breakpoint (gdbarch, bp_tgt); }
int remove_hw_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt) override
{ return aarch64_remove_hw_breakpoint (gdbarch, bp_tgt); }
bool watchpoint_addr_within_range (CORE_ADDR addr, CORE_ADDR start,
int length) override
{ return start <= addr && start + length - 1 >= addr; }
};
#endif /* AARCH64_NAT_H */

2
gdb/configure.nat
View File

@ -233,7 +233,7 @@ case ${gdb_host} in
case ${gdb_host_cpu} in case ${gdb_host_cpu} in
aarch64) aarch64)
# Host: AArch64 based machine running GNU/Linux # Host: AArch64 based machine running GNU/Linux
NATDEPFILES="${NATDEPFILES} aarch64-linux-nat.o \ NATDEPFILES="${NATDEPFILES} aarch64-nat.o aarch64-linux-nat.o \
aarch32-linux-nat.o nat/aarch64-hw-point.o \ aarch32-linux-nat.o nat/aarch64-hw-point.o \
nat/aarch64-linux-hw-point.o \ nat/aarch64-linux-hw-point.o \
nat/aarch64-linux.o \ nat/aarch64-linux.o \