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/* Copyright (C) 2009-2024 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 NAT_AARCH64_HW_POINT_H
#define NAT_AARCH64_HW_POINT_H
/* Macro definitions, data structures, and code for the hardware
breakpoint and hardware watchpoint support follow. We use the
following abbreviations throughout the code:
hw - hardware
bp - breakpoint
wp - watchpoint */
/* Maximum number of hardware breakpoint and watchpoint registers.
Neither of these values may exceed the width of dr_changed_t
measured in bits. */
#define AARCH64_HBP_MAX_NUM 16
#define AARCH64_HWP_MAX_NUM 16
/* Alignment requirement in bytes for addresses written to
hardware breakpoint and watchpoint value registers.
A ptrace call attempting to set an address that does not meet the
alignment criteria will fail. Limited support has been provided in
this port for unaligned watchpoints, such that from a GDB user
perspective, an unaligned watchpoint may be requested.
This is achieved by minimally enlarging the watched area to meet the
alignment requirement, and if necessary, splitting the watchpoint
over several hardware watchpoint registers. */
#define AARCH64_HBP_ALIGNMENT 4
#define AARCH64_HWP_ALIGNMENT 8
/* The maximum length of a memory region that can be watched by one
hardware watchpoint register. */
#define AARCH64_HWP_MAX_LEN_PER_REG 8
/* Macro for the expected version of the ARMv8-A debug architecture. */
#define AARCH64_DEBUG_ARCH_V8 0x6
#define AARCH64_DEBUG_ARCH_V8_1 0x7
#define AARCH64_DEBUG_ARCH_V8_2 0x8
#define AARCH64_DEBUG_ARCH_V8_4 0x9
#define AARCH64_DEBUG_ARCH_V8_8 0xa
/* Armv8.9 debug architecture. */
#define AARCH64_DEBUG_ARCH_V8_9 0xb
/* ptrace expects control registers to be formatted as follows:
31 13 5 3 1 0
+--------------------------------+----------+------+------+----+
| RESERVED (SBZ) | MASK | TYPE | PRIV | EN |
+--------------------------------+----------+------+------+----+
The TYPE field is ignored for breakpoints. */
#define DR_CONTROL_ENABLED(ctrl) (((ctrl) & 0x1) == 1)
#define DR_CONTROL_MASK(ctrl) (((ctrl) >> 5) & 0xff)
#define DR_CONTROL_TYPE(ctrl) (((ctrl) >> 3) & 0x3)
/* Structure for managing the hardware breakpoint/watchpoint resources.
DR_ADDR_* stores the address, DR_CTRL_* stores the control register
content, and DR_REF_COUNT_* counts the numbers of references to the
corresponding bp/wp, by which way the limited hardware resources
are not wasted on duplicated bp/wp settings (though so far gdb has
done a good job by not sending duplicated bp/wp requests). */
struct aarch64_debug_reg_state
{
/* hardware breakpoint */
CORE_ADDR dr_addr_bp[AARCH64_HBP_MAX_NUM];
unsigned int dr_ctrl_bp[AARCH64_HBP_MAX_NUM];
unsigned int dr_ref_count_bp[AARCH64_HBP_MAX_NUM];
/* hardware watchpoint */
/* Address aligned down to AARCH64_HWP_ALIGNMENT. */
CORE_ADDR dr_addr_wp[AARCH64_HWP_MAX_NUM];
/* Address as entered by user without any forced alignment. */
CORE_ADDR dr_addr_orig_wp[AARCH64_HWP_MAX_NUM];
unsigned int dr_ctrl_wp[AARCH64_HWP_MAX_NUM];
unsigned int dr_ref_count_wp[AARCH64_HWP_MAX_NUM];
};
extern int aarch64_num_bp_regs;
extern int aarch64_num_wp_regs;
/* Invoked when IDXth breakpoint/watchpoint register pair needs to be
updated. */
void aarch64_notify_debug_reg_change (ptid_t ptid, int is_watchpoint,
unsigned int idx);
unsigned int aarch64_watchpoint_offset (unsigned int ctrl);
unsigned int aarch64_watchpoint_length (unsigned int ctrl);
enum target_hw_bp_type aarch64_watchpoint_type (unsigned int ctrl);
/* 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);
int aarch64_handle_breakpoint (enum target_hw_bp_type type, CORE_ADDR addr,
int len, int is_insert, ptid_t ptid,
struct aarch64_debug_reg_state *state);
int aarch64_handle_watchpoint (enum target_hw_bp_type type, CORE_ADDR addr,
int len, int is_insert, ptid_t ptid,
struct aarch64_debug_reg_state *state);
/* Return TRUE if there are any hardware breakpoints. If WATCHPOINT is TRUE,
check hardware watchpoints instead. */
bool aarch64_any_set_debug_regs_state (aarch64_debug_reg_state *state,
bool watchpoint);
void aarch64_show_debug_reg_state (struct aarch64_debug_reg_state *state,
const char *func, CORE_ADDR addr,
int len, enum target_hw_bp_type type);
int aarch64_region_ok_for_watchpoint (CORE_ADDR addr, int len);
#endif /* NAT_AARCH64_HW_POINT_H */
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