OpenOCD使用简介

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基本信息

OpenOCD（Open On-Chip Debugger）

提供依赖JTAG接口的分层架构的片上编程和调试支持和TAP支持，包括：

  • (X)SVF回放，便于自动边界扫描和FPGA/CPLD编程；
  • 调试目标支持（如ARM、MIPS）：单步调试、断点/监控点、gprof性能分析等；
  • Flash芯片驱动（如CFI、NAND、内部闪存）；
  • 内嵌TCL解释器，方便脚本编写；

OpenOCD支持众多网络接口与之交互：包括：telnet、TCL和GDB。GDB server可以使得OpenOCD作为“远程目标”，使用标准的GNU GDB程序（和其他使用GDB协议的工具，如IDA Pro）源码级调试嵌入式系统。

官方手册

OpenOCD用户手册

OpenOCD开发手册

工程编译

源码解析

自动生成配置

配置命令

Linux环境中，执行./configure xxx配置后会返回

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$ ./configure --prefix=/usr/local/OpenOCD --datarootdir=/usr/local/OpenOCD --enable-ftdi=no --enable-remote-bitbang=no --enable-ep93xx=no --enable-amtjtagaccel=no --enable-jtag_dpi=no --enable-vdebug=no --enable-jtag_vpi=no --enable-buspirate=no --enable-openjtag=no --enable-presto=no --enable-stlink=no --enable-ti-icdi=no --enable-ulink=no --enable-usb-blaster-2=no --enable-ft232r=no --enable-vsllink=no --enable-xds110=no --enable-osbdm=no --enable-opendous=no --enable-armjtagew=no --enable-rlink=no --enable-usbprog=no --enable-esp-usb-jtag=no --enable-nulink=no --enable-kitprog=no --enable-usb-blaster=no --enable-parport-giveio=no --disable-werror --enable-dummy=yes

OpenOCD configuration summary
--------------------------------------------------
Linux GPIO bitbang through libgpiod     no
SEGGER J-Link Programmer                yes (auto)
Dummy Adapter                           yes
RISC-V Link Adapter                     yes
Use Capstone disassembly framework      no

新增rvlink适配器

configure.ac中新增RVLINK_ADAPTER配置项

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m4_define([DUMMY_ADAPTER],
	[[[dummy], [Dummy Adapter], [DUMMY]]])

m4_define([RVLINK_ADAPTER],
  [[[rvlink], [RISC-V Link Adapter], [RVLINK]]])
...
AC_ARG_ADAPTERS([DUMMY_ADAPTER],[no])

AC_ARG_ADAPTERS([RVLINK_ADAPTER],[yes])
...
PROCESS_ADAPTERS([DUMMY_ADAPTER], [true], [unused])
PROCESS_ADAPTERS([RVLINK_ADAPTER], [true], [unused])
...
m4_foreach([adapter], [USB1_ADAPTERS,
	HIDAPI_ADAPTERS, HIDAPI_USB1_ADAPTERS, LIBFTDI_ADAPTERS,
	LIBFTDI_USB1_ADAPTERS,
	LIBGPIOD_ADAPTERS,
	LIBJAYLINK_ADAPTERS, PCIE_ADAPTERS, SERIAL_PORT_ADAPTERS,
	DUMMY_ADAPTER,
    RVLINK_ADAPTER,
...

例如，对于rvlink适配器，其名称是RISC-V Link Adapter，编译宏为BUILD_RVLINK。

JTAG驱动编控制文件src/jtag/drivers/Makefile.am中可以使用编译宏RVLINK控制编译的代码。

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if DUMMY
DRIVERFILES += %D%/dummy.c
endif
if RVLINK
DRIVERFILES += %D%/rvlink.c
endif

Linux环境中编译会包含rvlink.c文件。

src/jtag/interfaces.c文件适配器驱动列表新增适配器。

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struct adapter_driver *adapter_drivers[] = {
#if BUILD_DUMMY == 1
		&dummy_adapter_driver,
#endif
#if BUILD_RVLINK == 1
		&rvlink_adapter_driver,
#endif
};

数据结构

调试目标target

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// src/target/target.h
struct target {
	struct target_type *type; // 包含目标名称和访问函数
	struct jtag_tap *tap; // jtag扫描链
	bool examined; // 检查目标标记
	enum target_debug_reason debug_reason; // 目标进入调试状态原因枚举
	enum target_state state; // 当前目标状态
	struct reg_cache *reg_cache; // 寄存器缓存
	struct breakpoint *breakpoints; // bp断点列表
	struct watchpoint *watchpoints; // wp断点列表
	struct trace *trace_info; // 跟踪信息
	void *arch_info; // 架构信息，常用于target与架构互转
	void *private_config; // 配置信息
	struct rtos *rtos; // RTOS信息
	struct list_head *smp_targets; // SMP列表节点
	struct gdb_service *gdb_service;  //  SMP场景，所有调试目标使用相同的GDB
};

调试目标列表

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// src/target/target.c
static struct target_type *target_types[] = {
	&stm8_target,
	&riscv_target,
	NULL,
};

对于ARM架构处理器，可以通过container_of(target->arch_info, struct cortex_a_common, armv7a_common.arm)，将target转换为cortex_a_common，然后可以获取ADI版本版本。

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// struct adiv5_dap->adi_version
struct cortex_a_common *cortex_a = target_to_cortex_a(target);
struct armv7a_common *armv7a = &cortex_a->armv7a_common;
armv7a->debug_ap->dap->adi_version == 5; /** Indicates ADI version (5, 6 or 0 for unknown) being used */

适配器adapter

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// icd_openocd/src/jtag/interface.h
struct adapter_driver {
	const char * const *transports; // 传输列表
	const struct command_registration *commands; // 命令列表
	// JTAG设备操作接口
	int (*init)(void); // 初始化资源
	int (*reset)(int srst, int trst); // 控制设备SRST和TRST信号
	
	struct jtag_interface *jtag_ops; // 低等级JTAG接口
};

JTAG接口

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// icd_openocd/src/jtag/interface.h
struct jtag_interface {
	unsigned supported; // 驱动支持能力的位表
	int (*execute_queue)(struct jtag_command *cmd_queue); // 执行队列中的命令
};

服务service

服务service，主要用于管理服务。在创建服务时会复制对应的服务驱动接口。

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// src/server/server.h
struct service {
	char *name;
	struct connection *connections;
	int (*new_connection)(struct connection *connection);
	int (*input)(struct connection *connection);
	void (*keep_client_alive)(struct connection *connection);
};

服务驱动service_driver，主要定义基本结构

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// src/server/server.h
struct service_driver {
	const char *name;
	int (*new_connection_handler)(struct connection *connection);
	int (*input_handler)(struct connection *connection);
	void (*keep_client_alive_handler)(struct connection *connection);
};

GDB服务驱动

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// src/server/gdb_server.c
static const struct service_driver gdb_service_driver = {
	.name = "gdb",
	.new_connection_during_keep_alive_handler = NULL,
	.new_connection_handler = gdb_new_connection,
	.input_handler = gdb_input,
	.connection_closed_handler = gdb_connection_closed,
	.keep_client_alive_handler = gdb_keep_client_alive,
};

连接connection

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// src/server/server.h
struct connection {
	int fd;
	int fd_out;	/* When using pipes we're writing to a different fd */
	struct sockaddr_in sin;
	struct command_context *cmd_ctx;
	struct service *service;
	bool input_pending;
	void *priv;
	struct connection *next;
};

启动OpenOCD

运行命令./src/openocd -s tcl -f tcl/interface/cmsis-dap.cfg -f tcl/target/xxxx.cfg启动OpenOCD。

配置文件解析

适配器驱动处理，各tcl配置文件

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// 适配器驱动文件 tcl/interface/cmsis-dap.cfg
adapter driver cmsis-dap
transport select jtag
adapter speed 2000

// 目标配置文件 tcl/target/xxxx.cfg
telnet_port 4444
gdb_port 3333
jtag newtap $_CHIPNAME cpu -enable -irlen 32
target create $_TARGETNAME riscv -chain-position $_TARGETNAME -coreid $_HARTID

解析tcl配置文件主流程

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// 主流程 src/openocd.c
openocd_main
    setup_command_handler // 注册命令处理函数
        adapter_register_commands // 注册adapter命令处理服务
    openocd_thread
        parse_config_file // 解析配置文件
        // 处理 tcl/interface/cmsis-dap.cfg 配置文件
        // 处理 tcl/target/xxxx.cfg

adapter命令匹配"cmsis-dap"流程

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// adapter命令回调，适配器配置解析匹配名称 src/jtag/adapter.c
interface_command_handlers // 匹配命令adapter
    adapter_command_handlers // 匹配命令driver
        handle_adapter_driver_command // 若驱动名称匹配，则切换adapter_driver，注册驱动的命令列表并更新allowed_transports列表

适配器列表

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// 适配器驱动列表 src/jtag/interfaces.c
struct adapter_driver *adapter_drivers[] = {
#if BUILD_CMSIS_DAP_USB == 1 || BUILD_CMSIS_DAP_HID == 1
		&cmsis_dap_adapter_driver,
#endif
};
// "cmsis-dap"适配器驱动
struct adapter_driver cmsis_dap_adapter_driver = {
	.name = "cmsis-dap",
};

其他命令处理

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// 解析目标配置文件，处理文件中各行命令
// 处理命令telnet_port，handle_telnet_port_command设置telnet_port
// 处理命令gdb_port，handle_gdb_port_command设置gdb_port
// 处理命令transport select，handle_transport_select在allowed_transports列表中匹配传输

主函数流程概览

openocd_main函数初始化逻辑

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// src/openocd.c
int openocd_main(int argc, char *argv[])
{
    ...
    // 注册各命令的处理函数
    struct command_context *cmd_ctx;
    cmd_ctx = setup_command_handler(NULL);
    ...
    ret = openocd_thread(argc, argv, cmd_ctx);
    ...
}

// src/openocd.c
static int openocd_thread(int argc, char *argv[], struct command_context *cmd_ctx)
{
    ...
    // 解析命令行参数
    parse_cmdline_args(cmd_ctx, argc, argv);
    ...
    // 解析配置文件，对调试器进行配置
    ret = parse_config_file(cmd_ctx);
    ...
    ret = server_init(cmd_ctx);
    ...
    ret = command_run_line(cmd_ctx, "init");
    ...
    ret = server_loop(cmd_ctx);
}

server_init函数初始化逻辑

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// src/server/server.c
int server_init(struct command_context *cmd_ctx)
{
    int ret = tcl_init();
    ret = telnet_init("Open On-Chip Debugger");
}

// src/server/tcl_server.c
int tcl_init(void)
{
    return add_service(&tcl_service_driver, tcl_port, CONNECTION_LIMIT_UNLIMITED, NULL);
}
static const struct service_driver tcl_service_driver = {
    .name = "tcl",
    .new_connection_during_keep_alive_handler = NULL,
    .new_connection_handler = tcl_new_connection,
    .input_handler = tcl_input,
    .connection_closed_handler = tcl_closed,
    .keep_client_alive_handler = NULL,
};

// src/server/telnet_server.c
int telnet_init(char *banner)
{
    int ret = add_service(&telnet_service_driver, telnet_port, CONNECTION_LIMIT_UNLIMITED,
        telnet_service);
}
static const struct service_driver telnet_service_driver = {
    .name = "telnet",
    .new_connection_during_keep_alive_handler = NULL,
    .new_connection_handler = telnet_new_connection,
    .input_handler = telnet_input,
    .connection_closed_handler = telnet_connection_closed,
    .keep_client_alive_handler = NULL,
};

server_loop主循环

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// src/server/server.c
int server_loop(struct command_context *command_context)
{
    // 循环处理services中所有服务的连接列表
    while(shutdown_openocd == CONTINUE_MAIN_LOOP)
    {
        // socket_select多路复用监听fd
        // 轮询监听间隔为100ms
        // 若服务有数据（service->fd），则接受连接并创建新的连接
        // 若连接有数据（c->fd），则调用service->input进行处理
        ...
    }
}

RISC-V架构目标示例

NEMU是RISC-V架构处理器硬件模拟器，OpenOCD通过TCP/51234接口连接它。

启动命令：./src/openocd -s tcl -f tcl/interface/rvlink.cfg -f tcl/target/simu/nemu.cfg

TCL配置文件

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// tcl/interface/rvlink.cfg
adapter driver RV-LINK
transport select jtag
rvlink connect 127.0.0.1 51234

// tcl/target/simu/nemu.cfg
if { ![info exists _SMP_MODE] } {
    set _SMP_MODE 1
}
if {![info exists _HARTID]} {
	set _HARTID 0x00
}
if {![info exists _CHIPNAME]} {
	set _CHIPNAME nemu
}
set _TARGETNAME $_CHIPNAME.cpu
adapter speed 2000
telnet_port 4444
gdb_port 3333
jtag newtap $_CHIPNAME cpu -enable -irlen 32
set _SMP_GROUP ""
target create $_TARGETNAME riscv -chain-position $_TARGETNAME -coreid $_HARTID
set _SMP_GROUP "$::_SMP_GROUP $_TARGETNAME"
if { $_SMP_MODE == 1 } {
    eval "target smp $_SMP_GROUP"
}

成功启动并连接时的输出

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$ ./src/openocd -s tcl -f tcl/interface/rvlink.cfg -f tcl/target/simu/nemu.cfg
Open On-Chip Debugger 0.12.0+dev-03889-g5fefbc2da-dirty (2024-09-10-10:57)
Licensed under GNU GPL v2
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
Info : Connected to server 127.0.0.1:51234
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : Note: The adapter "RV-LINK" doesn't support configurable speed
Info : JTAG tap: nemu.cpu tap/device found: 0x3ba0184d (mfg: 0x426 (Google Inc), part: 0xba01, ver: 0x3)
Info : [nemu.cpu] datacount=1 progbufsize=0
Warn : [nemu.cpu] We won't be able to execute fence instructions on this target. Memory may not always appear consistent. (progbufsize=0, impebreak=0)
Info : [nemu.cpu] Vector support with vlenb=0
Info : [nemu.cpu] S?aia detected with IMSIC
Info : [nemu.cpu] Core 0 made part of halt group 1.
Info : [nemu.cpu] Examined RISC-V core
Info : [nemu.cpu]  XLEN=32, misa=0x40000000
[nemu.cpu] Target successfully examined.
Info : [nemu.cpu] Examination succeed
Info : [nemu.cpu] starting gdb server on 3333
Info : Listening on port 3333 for gdb connections

rvlink.cfg文件

adapter命令匹配"RV-LINK"流程

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// adapter命令回调，适配器配置解析匹配名称 src/jtag/adapter.c
interface_command_handlers // 匹配命令adapter
    adapter_command_handlers // 匹配命令driver
        handle_adapter_driver_command // 若驱动名称匹配，则切换adapter_driver，注册驱动的命令列表并更新allowed_transports列表

适配器列表

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// 适配器驱动列表 src/jtag/interfaces.c
struct adapter_driver *adapter_drivers[] = {
#if BUILD_RVLINK == 1
		&rvlink_adapter_driver,
#endif
};
// "RV-LINK"适配器驱动 src/jtag/drivers/rvlink.c
struct adapter_driver rvlink_adapter_driver = {
	.name = "RV-LINK",
};

transport命令选择jtag流程

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// transport命令回调 src/transport/transport.c
transport_group // 匹配命令transport
	transport_commands // 匹配命令select
		handle_transport_select // 若名称匹配，则更新transport
			transport_select // 调用select回调函数，并更新session

内置jtag传输

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// src/jtag/core.c
static struct transport jtag_transport = {
	.name = "jtag",
	.select = jtag_select,
	.init = jtag_init,
};

rvlink命令执行流程

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// src/jtag/drivers/rvlink.c
rvlink_commands // 匹配命令rvlink
	rvlink_subcommands // 匹配命令connect
		rvlink_connect // 为目标建立TCP连接

nemu.cfg文件

telnet_port命令修改telnet端口

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// src/server/telnet_server.c
telnet_command_handlers // 匹配命令telnet_port
	handle_telnet_port_command // 直接调用函数
		server_pipe_command // 修改telnet_port字符串的值

gdb_port命令修改gdb远程连接端口

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// src/server/gdb_server.c
gdb_command_handlers // 匹配gdb_port
	handle_gdb_port_command // 修改gdb_port字符串的值，并同步更新gdb_port_next

jtag命令创建新的tap

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// jtag newtap nemu cpu -enable -irlen 32
// src/jtag/tcl.c
jtag_command_handlers // 匹配jtag
	jtag_subcommand_handlers // 匹配newtap
		handle_jtag_newtap // 创建nemu.cpu的tap对象
			handle_jtag_newtap_args // 初始化tap对象，名称、ir配置
			jtag_tap_init // 配置tap并将其加入tap列表__jtag_all_taps

target命令创建连接目标

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// target create nemu.cpu riscv -chain-position nemu.cpu -coreid 0x00
// src/target/target.c
target_command_handlers // 匹配target
	target_subcommand_handlers // 匹配create
		jim_target_create // 调整参数并调用函数
			target_create // 创建并匹配"riscv"调试目标，注册调试命令，更新all_targets

target命令设置smp

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// target smp nemu.cpu
// src/target/target.c
target_command_handlers // 匹配target
	target_subcommand_handlers // 匹配smp
		handle_target_smp // 将所有target加入到smp列表中，每个组的smp编号从1开始

初始化命令

init命令初始化openocd，将会通过command_run_line函数触发一系列初始化函数。

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// src/openocd.c
openocd_command_handlers // 匹配init
	handle_init_command // 执行初始化函数。执行过程中jtag_poll_en为false，执行完成后恢复。
		// target init命令
		adapter_init // 适配器初始化 src/jtag/adapter.c
			adapter_driver_gpios_init // 适配器驱动通用IO口初始化
			// 特定（示例的rvlink）适配器初始化接口
		// transport init命令
		// dap init命令
		target_examine // 循环检查调试目标列表；
			// 延时检查
			target_examine_one // 单次检查
				target->type->examine(target) // 调用特定（示例为riscv）架构对应的检查接口
		// flash init命令
		// nand init命令
		// pld init命令
		// tpiu init命令
		gdb_target_add_all // 循环调试目标列表，启动对应的GDB server
			// _run_post_init_commands命令

target命令初始化所有调试目标

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// target init 
// src/target/target.c
target_command_handlers // 匹配target
	target_subcommand_handlers // 匹配init
		handle_target_init_command // 直接调用startup.tcl脚本命令 init_targets init_target_events init_board

// init_targets 初始化函数为空
// src/target/startup.tcl
proc init_targets {} {
}

// init_target_events // 循环遍历目标列表，通过set_default_target_event为所有目标设置默认事件命令
// src/target/startup.tcl
proc init_target_events {} {
	set targets [target names] // 获取到所有调试目标名称
	foreach t $targets {
		set_default_target_event $t gdb-flash-erase-start "reset init"
		set_default_target_event $t gdb-flash-write-end "reset halt"
		set_default_target_event $t gdb-attach "halt 1000"
	}
}

// init_board 初始化函数为空
// src/target/startup.tcl
proc init_board {} {
}

transport传输初始化

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// transport init
// src/transport/transport.c
transport_group // 匹配transport
	transport_commands // 匹配init
		handle_transport_init // 校验是否设置session变量，并调用特定（示例为jtag）的初始化接口

// jtag适配器初始化
// src/jtag/core.c
jtag_init // 初始化jtag适配器并执行jtag_init命令

// jtag_init
// src/jtag/startup.tcl
proc jtag_init {} {
	if {[catch {jtag arp_init} err]!=0} {
		# try resetting additionally
		init_reset startup
	}
}

// jtag arp_init
// src/jtag/tcl.c
jtag_command_handlers // 匹配jtag
	jtag_subcommand_handlers // 匹配arp_init
		handle_jtag_arp_init // 直接调用内部函数
			jtag_init_inner // 执行jtag tap等初始化

dap初始化处理逻辑

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// dap init
// src/target/arm_dap.c
dap_commands // 匹配dap
	dap_subcommand_handlers // 匹配init
		handle_dap_init // 直接调用函数
			dap_init_all // 初始化所有dap对象

简单命令：flash init nand init pld init tpiu init

_run_post_init_commands初始化结束脚本命令

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// src/helper/startup.tcl
// 循环处理post_init_commands列表
proc _run_post_init_commands {} {
	if {[info exists ::post_init_commands]} {
		foreach cmd $::post_init_commands {
			eval $cmd
		}
	}
}

// src/target/startup.tcl
// 将以下脚本函数加入到post_init_commands列表
lappend post_init_commands _post_init_target_array_mem
lappend post_init_commands _post_init_target_cortex_a_cache_auto

GDB交互

GDB连接处理

server_loop主循环

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// src/server/server.c
int server_loop(struct command_context *command_context)
{
    // 循环处理services中所有服务的连接列表
    while(shutdown_openocd == CONTINUE_MAIN_LOOP)
    {
        socket_select(fd_max + 1, &read_fds, NULL, NULL, &tv); // select处理所有服务连接，默认超时polling_period为100ms
        target_call_timer_callbacks(); // 调试目标计时器回调；会调用keep_alive和server_keep_clients_alive处理各服务的保活逻辑
        process_jim_events(command_context); // jim事件处理函数
        
        // 循环遍历所有服务
        for (service = services; service; service = service->next) {
            // 若服务连接有数据，则创建连接
            if (FD_ISSET(service->fd, &read_fds)) {
	            add_connection(service, command_context);
            }
            // 循环遍历服务下所有客户端连接，调用服务输入处理接口
            for (c = service->connections; c; ) {
                service->input(c);
            }
        }
    }
}

创建连接

服务创建连接，并将其加入到服务连接队列中

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// src/server/server.c
add_connection
	// 创建connection对象
	accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
	service->new_connection // gdb服务创建连接回调
	// connection对象加入到service->connections尾部

GDB创建连接

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// src/server/gdb_server.c
// service->new_connection
gdb_service_driver
	gdb_new_connection // 初始化gdb连接目标
		// 创建gdb连接对象
		breakpoint_clear_target(target);
		watchpoint_clear_target(target);
		target_call_event_callbacks(target, TARGET_EVENT_GDB_ATTACH);

输入处理

GDB输入处理

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// src/server/gdb_server.c
// service->input
gdb_service_driver
	gdb_input // gdb输入处理回调函数，直接调用函数
		gdb_input_inner // gdb输入处理函数
			gdb_get_packet // 从连接获取协议包
				gdb_get_packet_inner // 从连接中读取数据包，若成功则回复ACK（'+'）
					gdb_get_char // 读取数据包，返回第一个字符
					fetch_packet // 解析剩余数据，并计算校验和；当切换到noack模式，则不会校验校验和，并跳过回复ACK（'+'）
			/* 
			根据packet[0]第一个字符，执行对应的处理函数
			一般小写为读操作函数，大写为写操作函数
			*/

GDB远程协议

具体协议需要参考GDB远程协议章节（Appendix E gdb Remote Serial Protocol）。

连接OpenOCD

GDB执行命令连接OpenOCD。执行GDB命令set debug remote 1打开远程调试后，再连接远程目标可以看到通信日志。

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(gdb) target remote :3333
0x80000004 in ?? ()

qSupported

探测OpenOCD支持哪些特性

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  [remote] Sending packet: $qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;memory-tagging+;xmlRegisters=i386#77
  [remote] Received Ack
  [remote] Packet received: PacketSize=4000;qXfer:memory-map:read-;qXfer:features:read+;qXfer:threads:read+;QStartNoAckMode+;vContSupported+
  [remote] packet_ok: Packet qSupported (supported-packets) is supported

// src/server/gdb_server.c
gdb_query_packet // 处理q/Q消息
	xml_printf // xml格式的回复消息
	gdb_put_packet // 回复消息

vMustReplyEmpty

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  [remote] Sending packet: $vMustReplyEmpty#3a
  [remote] Received Ack
  [remote] Packet received: 
  
// src/server/gdb_server.c
gdb_v_packet // 处理v消息
	// 无法匹配中任何命令
	gdb_put_packet(connection, "", 0) // 直接回复空消息

QStartNoAckMode

设置不回复ACK模式

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  [remote] Sending packet: $QStartNoAckMode#b0
  [remote] Received Ack
  [remote] Packet received: OK

// src/server/gdb_server.c
gdb_query_packet // 处理q/Q消息
	gdb_put_packet // 回复OK

Hgxxx

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  [remote] Sending packet: $Hg0#df
  [remote] Packet received: OK
  
// src/server/gdb_server.c
gdb_thread_packet // 处理H消息
	rtos_thread_packet // rtos线程包处理
		// 若调试目标存在rtos，则设置当前线程
		gdb_put_packet // 回复OK

qXfer:features:read

qXfer:features:read:target.xml:<offset,length>命令分页读取xml格式的架构描述文件，详细信息见riscv描述

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  [remote] Sending packet: $qXfer:features:read:target.xml:0,1000#0c
  [remote] Packet received: m<?xml version="1.0"?>\n<!DOCTYPE target SYSTEM "gdb-target.dtd">\n<target version="1.0">\n<architecture>riscv:rv32</architecture>\n<feature name="org.gnu.gdb.riscv.cpu">\n<reg name="zero" bitsize="32" regnum="0" save-restore="yes" type="int" group="general"/>\n<reg name="ra" bitsize="32" regnum="1" save-restore="yes" type="int" group="general"/>\n<reg name="sp" bitsize="32" regnum="2" save-restore="yes" type="int" group="general"/>\n<reg name="gp" bitsize="32" regnum="3" save-restore="yes" type="int" group="genera [3585 bytes omitted]
  ...
  [remote] Sending packet: $qXfer:features:read:target.xml:9000,1000#a5
  [remote] Packet received: l type="int" group="csr"/>\n<reg name="hpmcounter27h" bitsize="32" regnum="3292" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter28h" bitsize="32" regnum="3293" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter29h" bitsize="32" regnum="3294" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter30h" bitsize="32" regnum="3295" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter31h" bitsize="32" regnum="3296" save-restore="no" type="int" group="csr"/>\n<reg  [882 bytes omitted]

// src/server/gdb_server.c
gdb_query_packet // 处理q/Q消息
	decode_xfer_read // 解析qXfer命令
	gdb_get_target_description_chunk // 架构描述文件分块处理
		gdb_generate_target_description // xml格式打印完整的架构描述文件
			smp_reg_list_noread // 读取架构完整的寄存器列表
			get_reg_features_list // 获取架构寄存器特性列表
			xml_printf // 循环打印xml格式的描述文件
	gdb_put_packet(connection, xml, strlen(xml)) // 回复架构描述文件xml数据；第一个字符为'm'表示后面有分页；第一个字符为'l'表示最后一页；

qTStatus

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  [remote] Sending packet: $qTStatus#49
  [remote] Packet received: 

// src/server/gdb_server.c
gdb_query_packet // 处理q/Q消息
	// 无法匹配中任何命令
	gdb_put_packet(connection, "", 0) // 直接回复空消息

?

获取进入调试模式的原因对应的信号量

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  [remote] Sending packet: $?#3f
  [remote] Packet received: S00
  
// src/server/gdb_server.c
gdb_last_signal_packet 处理?消息
	gdb_last_signal // 获取上次收到gdb的信号量（根据进入调试模式的原因转换）
	gdb_put_packet(connection, sig_reply, 3); // 回复对应的信号量消息

qXfer:threads:read

获取线程列表

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  [remote] Sending packet: $qXfer:threads:read::0,1000#92
  [remote] Packet received: l<?xml version="1.0"?>\n<threads>\n</threads>\n

// src/server/gdb_server.c
gdb_query_packet // 处理q/Q消息
	decode_xfer_read // 解析qXfer命令
	gdb_get_thread_list_chunk // 线程列表线程信息分块处理
		gdb_generate_thread_list // xml格式打印完整的线程列表信息
	gdb_put_packet(connection, xml, strlen(xml)); // 回复线程列表信息xml数据；第一个字符为'm'表示后面有分页；第一个字符为'l'表示最后一页；

Hc-xxx

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  [remote] Sending packet: $Hc-1#09
  [remote] Packet received: OK

// src/server/gdb_server.c
gdb_thread_packet // 处理H消息
	rtos_thread_packet // rtos线程包处理
		gdb_put_packet // 回复OK

qC

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  [remote] Sending packet: $qC#b4
  [remote] Packet received: QC0

// src/server/gdb_server.c
rtos_thread_packet // 处理q消息
	gdb_put_packet(connection, "QC0", 3); // 无rtos，直接回复QC0

qAttached

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  [remote] Sending packet: $qAttached#8f
  [remote] Packet received: 1
  [remote] packet_ok: Packet qAttached (query-attached) is supported

// src/server/gdb_server.c
rtos_thread_packet // 处理q消息
	gdb_put_packet(connection, "1", 1); // 直接回复"1"表示支持

g

获取通用寄存器列表

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  [remote] Sending packet: $g#67
  [remote] Packet received: 000000000000000000000000000000000000000000000000000000000000000000000000000000005000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004000080

// src/server/gdb_server.c
gdb_get_registers_packet // 处理g消息
	target_get_gdb_reg_list // 获取特定架构寄存器列表
	gdb_get_reg_value_as_str // 循环遍历所有寄存器，将寄存器的值格式化为字符串
		gdb_str_to_target // 格式化寄存器的值，每个字节格式化为十六进制2位字符
	gdb_put_packet(connection, reg_packet, reg_packet_size); // 返回寄存器值字符化后的数据

mxxx

m<address>,<length>读取指定地址的内存数据。默认分别读取当前PC和上一次PC对应的指令。

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  [remote] Sending packet: $m80000004,4#59
  [remote] Packet received: 93051005
  [remote] Sending packet: $m80000000,4#55
  [remote] Packet received: 13050005

// src/server/gdb_server.c
gdb_read_memory_packet // 处理m消息
	target_read_buffer // 读取特定架构内存数据
	gdb_put_packet // 返回内存数据字符化后的数据

附件

GDB通信日志

GDB远程连接日志

执行GDB命令set debug remote 1打开远程调试后，再连接远程目标可以看到通信日志

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(gdb) target remote :3333
Remote debugging using :3333
[remote] start_remote_1: enter
  [remote] Sending packet: $qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;memory-tagging+;xmlRegisters=i386#77
  [remote] Received Ack
  [remote] Packet received: PacketSize=4000;qXfer:memory-map:read-;qXfer:features:read+;qXfer:threads:read+;QStartNoAckMode+;vContSupported+
  [remote] packet_ok: Packet qSupported (supported-packets) is supported
  [remote] Sending packet: $vMustReplyEmpty#3a
  [remote] Received Ack
  [remote] Packet received: 
  [remote] Sending packet: $QStartNoAckMode#b0
  [remote] Received Ack
  [remote] Packet received: OK
  [remote] Sending packet: $Hg0#df
  [remote] Packet received: OK
  [remote] Sending packet: $qXfer:features:read:target.xml:0,1000#0c
  [remote] Packet received: m<?xml version="1.0"?>\n<!DOCTYPE target SYSTEM "gdb-target.dtd">\n<target version="1.0">\n<architecture>riscv:rv32</architecture>\n<feature name="org.gnu.gdb.riscv.cpu">\n<reg name="zero" bitsize="32" regnum="0" save-restore="yes" type="int" group="general"/>\n<reg name="ra" bitsize="32" regnum="1" save-restore="yes" type="int" group="general"/>\n<reg name="sp" bitsize="32" regnum="2" save-restore="yes" type="int" group="general"/>\n<reg name="gp" bitsize="32" regnum="3" save-restore="yes" type="int" group="genera [3585 bytes omitted]
  [remote] Sending packet: $qXfer:features:read:target.xml:1000,1000#9d
  [remote] Packet received: m="sstateen0" bitsize="32" regnum="333" save-restore="no" type="int" group="csr"/>\n<reg name="sstateen1" bitsize="32" regnum="334" save-restore="no" type="int" group="csr"/>\n<reg name="sstateen2" bitsize="32" regnum="335" save-restore="no" type="int" group="csr"/>\n<reg name="sstateen3" bitsize="32" regnum="336" save-restore="no" type="int" group="csr"/>\n<reg name="snxti" bitsize="32" regnum="390" save-restore="no" type="int" group="csr"/>\n<reg name="sintstatus" bitsize="32" regnum="391" save-restore="no" ty [3585 bytes omitted]
  [remote] Sending packet: $qXfer:features:read:target.xml:2000,1000#9e
  [remote] Packet received: mno" type="int" group="csr"/>\n<reg name="mhpmevent8" bitsize="32" regnum="873" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmevent9" bitsize="32" regnum="874" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmevent10" bitsize="32" regnum="875" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmevent11" bitsize="32" regnum="876" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmevent12" bitsize="32" regnum="877" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmeven [3585 bytes omitted]
  [remote] Sending packet: $qXfer:features:read:target.xml:3000,1000#9f
  [remote] Packet received: m type="int" group="csr"/>\n<reg name="pmpcfg6" bitsize="32" regnum="999" save-restore="no" type="int" group="csr"/>\n<reg name="pmpcfg7" bitsize="32" regnum="1000" save-restore="no" type="int" group="csr"/>\n<reg name="pmpcfg8" bitsize="32" regnum="1001" save-restore="no" type="int" group="csr"/>\n<reg name="pmpcfg9" bitsize="32" regnum="1002" save-restore="no" type="int" group="csr"/>\n<reg name="pmpcfg10" bitsize="32" regnum="1003" save-restore="no" type="int" group="csr"/>\n<reg name="pmpcfg11" bitsize="32" r [3585 bytes omitted]
  [remote] Sending packet: $qXfer:features:read:target.xml:4000,1000#a0
  [remote] Packet received: m" save-restore="no" type="int" group="csr"/>\n<reg name="pmpaddr35" bitsize="32" regnum="1044" save-restore="no" type="int" group="csr"/>\n<reg name="pmpaddr36" bitsize="32" regnum="1045" save-restore="no" type="int" group="csr"/>\n<reg name="pmpaddr37" bitsize="32" regnum="1046" save-restore="no" type="int" group="csr"/>\n<reg name="pmpaddr38" bitsize="32" regnum="1047" save-restore="no" type="int" group="csr"/>\n<reg name="pmpaddr39" bitsize="32" regnum="1048" save-restore="no" type="int" group="csr"/>\n<reg n [3585 bytes omitted]
  [remote] Sending packet: $qXfer:features:read:target.xml:5000,1000#a1
  [remote] Packet received: m0h" bitsize="32" regnum="1629" save-restore="no" type="int" group="csr"/>\n<reg name="hstateen1h" bitsize="32" regnum="1630" save-restore="no" type="int" group="csr"/>\n<reg name="hstateen2h" bitsize="32" regnum="1631" save-restore="no" type="int" group="csr"/>\n<reg name="hstateen3h" bitsize="32" regnum="1632" save-restore="no" type="int" group="csr"/>\n<reg name="htval" bitsize="32" regnum="1668" save-restore="no" type="int" group="csr"/>\n<reg name="hip" bitsize="32" regnum="1669" save-restore="no" type="int [3585 bytes omitted]
  [remote] Sending packet: $qXfer:features:read:target.xml:6000,1000#a2
  [remote] Packet received: m" bitsize="32" regnum="2020" save-restore="no" type="int" group="csr"/>\n<reg name="tinfo" bitsize="32" regnum="2021" save-restore="no" type="int" group="csr"/>\n<reg name="tcontrol" bitsize="32" regnum="2022" save-restore="no" type="int" group="csr"/>\n<reg name="mcontext" bitsize="32" regnum="2025" save-restore="no" type="int" group="csr"/>\n<reg name="mscontext" bitsize="32" regnum="2027" save-restore="no" type="int" group="csr"/>\n<reg name="dcsr" bitsize="32" regnum="2033" save-restore="no" type="int" grou [3585 bytes omitted]
  [remote] Sending packet: $qXfer:features:read:target.xml:7000,1000#a3
  [remote] Packet received: m type="int" group="csr"/>\n<reg name="mhpmcounter5h" bitsize="32" regnum="3014" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmcounter6h" bitsize="32" regnum="3015" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmcounter7h" bitsize="32" regnum="3016" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmcounter8h" bitsize="32" regnum="3017" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmcounter9h" bitsize="32" regnum="3018" save-restore="no" type="int" group="csr"/>\n<reg  [3585 bytes omitted]
  [remote] Sending packet: $qXfer:features:read:target.xml:8000,1000#a4
  [remote] Packet received: mestore="no" type="int" group="csr"/>\n<reg name="hpmcounter16" bitsize="32" regnum="3153" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter17" bitsize="32" regnum="3154" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter18" bitsize="32" regnum="3155" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter19" bitsize="32" regnum="3156" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter20" bitsize="32" regnum="3157" save-restore="no" type="int" group="csr"/> [3585 bytes omitted]
  [remote] Sending packet: $qXfer:features:read:target.xml:9000,1000#a5
  [remote] Packet received: l type="int" group="csr"/>\n<reg name="hpmcounter27h" bitsize="32" regnum="3292" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter28h" bitsize="32" regnum="3293" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter29h" bitsize="32" regnum="3294" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter30h" bitsize="32" regnum="3295" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter31h" bitsize="32" regnum="3296" save-restore="no" type="int" group="csr"/>\n<reg  [882 bytes omitted]
  [remote] Sending packet: $qTStatus#49
  [remote] Packet received: 
  [remote] packet_ok: Packet qTStatus (trace-status) is NOT supported
  [remote] Sending packet: $?#3f
  [remote] Packet received: S00
  [remote] Sending packet: $qXfer:threads:read::0,1000#92
  [remote] Packet received: l<?xml version="1.0"?>\n<threads>\n</threads>\n
  [remote] Sending packet: $Hc-1#09
  [remote] Packet received: OK
  [remote] Sending packet: $qC#b4
  [remote] Packet received: QC0
  [remote] Sending packet: $qAttached#8f
  [remote] Packet received: 1
  [remote] packet_ok: Packet qAttached (query-attached) is supported
warning: No executable has been specified and target does not support
determining executable automatically.  Try using the "file" command.
  [remote] wait: enter
    [remote] select_thread_for_ambiguous_stop_reply: enter
      [remote] select_thread_for_ambiguous_stop_reply: process_wide_stop = 0
      [remote] select_thread_for_ambiguous_stop_reply: first resumed thread is Remote target
      [remote] select_thread_for_ambiguous_stop_reply: is this guess ambiguous? = 0
    [remote] select_thread_for_ambiguous_stop_reply: exit
  [remote] wait: exit
  [remote] Sending packet: $g#67
  [remote] Packet received: 000000000000000000000000000000000000000000000000000000000000000000000000000000005000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004000080
  [remote] Sending packet: $qXfer:threads:read::0,1000#92
  [remote] Packet received: l<?xml version="1.0"?>\n<threads>\n</threads>\n
  [remote] Sending packet: $m80000004,4#59
  [remote] Packet received: 93051005
  [remote] Sending packet: $m80000000,4#55
  [remote] Packet received: 13050005
0x80000000 in ?? ()
[remote] start_remote_1: exit

架构描述文件

riscv描述文件

通信协议日志

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[remote] Sending packet: $qXfer:features:read:target.xml:0,1000#0c
[remote] Packet received: m<?xml version="1.0"?>\n<!DOCTYPE target SYSTEM "gdb-target.dtd">\n<target version="1.0">\n<architecture>riscv:rv32</architecture>\n<feature name="org.gnu.gdb.riscv.cpu">\n<reg name="zero" bitsize="32" regnum="0" save-restore="yes" type="int" group="general"/>\n<reg name="ra" bitsize="32" regnum="1" save-restore="yes" type="int" group="general"/>\n<reg name="sp" bitsize="32" regnum="2" save-restore="yes" type="int" group="general"/>\n<reg name="gp" bitsize="32" regnum="3" save-restore="yes" type="int" group="genera [3585 bytes omitted]
[remote] Sending packet: $qXfer:features:read:target.xml:1000,1000#9d
[remote] Packet received: m="sstateen0" bitsize="32" regnum="333" save-restore="no" type="int" group="csr"/>\n<reg name="sstateen1" bitsize="32" regnum="334" save-restore="no" type="int" group="csr"/>\n<reg name="sstateen2" bitsize="32" regnum="335" save-restore="no" type="int" group="csr"/>\n<reg name="sstateen3" bitsize="32" regnum="336" save-restore="no" type="int" group="csr"/>\n<reg name="snxti" bitsize="32" regnum="390" save-restore="no" type="int" group="csr"/>\n<reg name="sintstatus" bitsize="32" regnum="391" save-restore="no" ty [3585 bytes omitted]
[remote] Sending packet: $qXfer:features:read:target.xml:2000,1000#9e
[remote] Packet received: mno" type="int" group="csr"/>\n<reg name="mhpmevent8" bitsize="32" regnum="873" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmevent9" bitsize="32" regnum="874" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmevent10" bitsize="32" regnum="875" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmevent11" bitsize="32" regnum="876" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmevent12" bitsize="32" regnum="877" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmeven [3585 bytes omitted]
[remote] Sending packet: $qXfer:features:read:target.xml:3000,1000#9f
[remote] Packet received: m type="int" group="csr"/>\n<reg name="pmpcfg6" bitsize="32" regnum="999" save-restore="no" type="int" group="csr"/>\n<reg name="pmpcfg7" bitsize="32" regnum="1000" save-restore="no" type="int" group="csr"/>\n<reg name="pmpcfg8" bitsize="32" regnum="1001" save-restore="no" type="int" group="csr"/>\n<reg name="pmpcfg9" bitsize="32" regnum="1002" save-restore="no" type="int" group="csr"/>\n<reg name="pmpcfg10" bitsize="32" regnum="1003" save-restore="no" type="int" group="csr"/>\n<reg name="pmpcfg11" bitsize="32" r [3585 bytes omitted]
[remote] Sending packet: $qXfer:features:read:target.xml:4000,1000#a0
[remote] Packet received: m" save-restore="no" type="int" group="csr"/>\n<reg name="pmpaddr35" bitsize="32" regnum="1044" save-restore="no" type="int" group="csr"/>\n<reg name="pmpaddr36" bitsize="32" regnum="1045" save-restore="no" type="int" group="csr"/>\n<reg name="pmpaddr37" bitsize="32" regnum="1046" save-restore="no" type="int" group="csr"/>\n<reg name="pmpaddr38" bitsize="32" regnum="1047" save-restore="no" type="int" group="csr"/>\n<reg name="pmpaddr39" bitsize="32" regnum="1048" save-restore="no" type="int" group="csr"/>\n<reg n [3585 bytes omitted]
[remote] Sending packet: $qXfer:features:read:target.xml:5000,1000#a1
[remote] Packet received: m0h" bitsize="32" regnum="1629" save-restore="no" type="int" group="csr"/>\n<reg name="hstateen1h" bitsize="32" regnum="1630" save-restore="no" type="int" group="csr"/>\n<reg name="hstateen2h" bitsize="32" regnum="1631" save-restore="no" type="int" group="csr"/>\n<reg name="hstateen3h" bitsize="32" regnum="1632" save-restore="no" type="int" group="csr"/>\n<reg name="htval" bitsize="32" regnum="1668" save-restore="no" type="int" group="csr"/>\n<reg name="hip" bitsize="32" regnum="1669" save-restore="no" type="int [3585 bytes omitted]
[remote] Sending packet: $qXfer:features:read:target.xml:6000,1000#a2
[remote] Packet received: m" bitsize="32" regnum="2020" save-restore="no" type="int" group="csr"/>\n<reg name="tinfo" bitsize="32" regnum="2021" save-restore="no" type="int" group="csr"/>\n<reg name="tcontrol" bitsize="32" regnum="2022" save-restore="no" type="int" group="csr"/>\n<reg name="mcontext" bitsize="32" regnum="2025" save-restore="no" type="int" group="csr"/>\n<reg name="mscontext" bitsize="32" regnum="2027" save-restore="no" type="int" group="csr"/>\n<reg name="dcsr" bitsize="32" regnum="2033" save-restore="no" type="int" grou [3585 bytes omitted]
[remote] Sending packet: $qXfer:features:read:target.xml:7000,1000#a3
[remote] Packet received: m type="int" group="csr"/>\n<reg name="mhpmcounter5h" bitsize="32" regnum="3014" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmcounter6h" bitsize="32" regnum="3015" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmcounter7h" bitsize="32" regnum="3016" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmcounter8h" bitsize="32" regnum="3017" save-restore="no" type="int" group="csr"/>\n<reg name="mhpmcounter9h" bitsize="32" regnum="3018" save-restore="no" type="int" group="csr"/>\n<reg  [3585 bytes omitted]
[remote] Sending packet: $qXfer:features:read:target.xml:8000,1000#a4
[remote] Packet received: mestore="no" type="int" group="csr"/>\n<reg name="hpmcounter16" bitsize="32" regnum="3153" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter17" bitsize="32" regnum="3154" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter18" bitsize="32" regnum="3155" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter19" bitsize="32" regnum="3156" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter20" bitsize="32" regnum="3157" save-restore="no" type="int" group="csr"/> [3585 bytes omitted]
[remote] Sending packet: $qXfer:features:read:target.xml:9000,1000#a5
[remote] Packet received: l type="int" group="csr"/>\n<reg name="hpmcounter27h" bitsize="32" regnum="3292" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter28h" bitsize="32" regnum="3293" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter29h" bitsize="32" regnum="3294" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter30h" bitsize="32" regnum="3295" save-restore="no" type="int" group="csr"/>\n<reg name="hpmcounter31h" bitsize="32" regnum="3296" save-restore="no" type="int" group="csr"/>\n<reg  [882 bytes omitted]

xml格式描述文件

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<?xml version="1.0"?>
<!DOCTYPE target SYSTEM "gdb-target.dtd">
<target version="1.0">
  <architecture>riscv:rv32</architecture>
  <feature name="org.gnu.gdb.riscv.cpu">
    <reg name="zero" bitsize="32" regnum="0" save-restore="yes" type="int" group="general"/>
    <reg name="ra" bitsize="32" regnum="1" save-restore="yes" type="int" group="general"/>
    <reg name="sp" bitsize="32" regnum="2" save-restore="yes" type="int" group="general"/>
    <reg name="gp" bitsize="32" regnum="3" save-restore="yes" type="int" group="general"/>
    <reg name="tp" bitsize="32" regnum="4" save-restore="yes" type="int" group="general"/>
    <reg name="t0" bitsize="32" regnum="5" save-restore="yes" type="int" group="general"/>
    <reg name="t1" bitsize="32" regnum="6" save-restore="yes" type="int" group="general"/>
    <reg name="t2" bitsize="32" regnum="7" save-restore="yes" type="int" group="general"/>
    <reg name="fp" bitsize="32" regnum="8" save-restore="yes" type="int" group="general"/>
    <reg name="s1" bitsize="32" regnum="9" save-restore="yes" type="int" group="general"/>
    <reg name="a0" bitsize="32" regnum="10" save-restore="yes" type="int" group="general"/>
    <reg name="a1" bitsize="32" regnum="11" save-restore="yes" type="int" group="general"/>
    <reg name="a2" bitsize="32" regnum="12" save-restore="yes" type="int" group="general"/>
    <reg name="a3" bitsize="32" regnum="13" save-restore="yes" type="int" group="general"/>
    <reg name="a4" bitsize="32" regnum="14" save-restore="yes" type="int" group="general"/>
    <reg name="a5" bitsize="32" regnum="15" save-restore="yes" type="int" group="general"/>
    <reg name="a6" bitsize="32" regnum="16" save-restore="yes" type="int" group="general"/>
    <reg name="a7" bitsize="32" regnum="17" save-restore="yes" type="int" group="general"/>
    <reg name="s2" bitsize="32" regnum="18" save-restore="yes" type="int" group="general"/>
    <reg name="s3" bitsize="32" regnum="19" save-restore="yes" type="int" group="general"/>
    <reg name="s4" bitsize="32" regnum="20" save-restore="yes" type="int" group="general"/>
    <reg name="s5" bitsize="32" regnum="21" save-restore="yes" type="int" group="general"/>
    <reg name="s6" bitsize="32" regnum="22" save-restore="yes" type="int" group="general"/>
    <reg name="s7" bitsize="32" regnum="23" save-restore="yes" type="int" group="general"/>
    <reg name="s8" bitsize="32" regnum="24" save-restore="yes" type="int" group="general"/>
    <reg name="s9" bitsize="32" regnum="25" save-restore="yes" type="int" group="general"/>
    <reg name="s10" bitsize="32" regnum="26" save-restore="yes" type="int" group="general"/>
    <reg name="s11" bitsize="32" regnum="27" save-restore="yes" type="int" group="general"/>
    <reg name="t3" bitsize="32" regnum="28" save-restore="yes" type="int" group="general"/>
    <reg name="t4" bitsize="32" regnum="29" save-restore="yes" type="int" group="general"/>
    <reg name="t5" bitsize="32" regnum="30" save-restore="yes" type="int" group="general"/>
    <reg name="t6" bitsize="32" regnum="31" save-restore="yes" type="int" group="general"/>
    <reg name="pc" bitsize="32" regnum="32" save-restore="yes" type="int" group="general"/>
  </feature>
  <feature name="org.gnu.gdb.riscv.csr">
    <reg name="utvt" bitsize="32" regnum="72" save-restore="no" type="int" group="csr"/>
    <reg name="seed" bitsize="32" regnum="86" save-restore="no" type="int" group="csr"/>
    <reg name="jvt" bitsize="32" regnum="88" save-restore="no" type="int" group="csr"/>
    <reg name="unxti" bitsize="32" regnum="134" save-restore="no" type="int" group="csr"/>
    <reg name="uintstatus" bitsize="32" regnum="135" save-restore="no" type="int" group="csr"/>
    <reg name="uscratchcsw" bitsize="32" regnum="137" save-restore="no" type="int" group="csr"/>
    <reg name="uscratchcswl" bitsize="32" regnum="138" save-restore="no" type="int" group="csr"/>
    <reg name="sedeleg" bitsize="32" regnum="323" save-restore="no" type="int" group="csr"/>
    <reg name="sideleg" bitsize="32" regnum="324" save-restore="no" type="int" group="csr"/>
    <reg name="stvt" bitsize="32" regnum="328" save-restore="no" type="int" group="csr"/>
    <reg name="senvcfg" bitsize="32" regnum="331" save-restore="no" type="int" group="csr"/>
    <reg name="sstateen0" bitsize="32" regnum="333" save-restore="no" type="int" group="csr"/>
    <reg name="sstateen1" bitsize="32" regnum="334" save-restore="no" type="int" group="csr"/>
    <reg name="sstateen2" bitsize="32" regnum="335" save-restore="no" type="int" group="csr"/>
    <reg name="sstateen3" bitsize="32" regnum="336" save-restore="no" type="int" group="csr"/>
    <reg name="snxti" bitsize="32" regnum="390" save-restore="no" type="int" group="csr"/>
    <reg name="sintstatus" bitsize="32" regnum="391" save-restore="no" type="int" group="csr"/>
    <reg name="sscratchcsw" bitsize="32" regnum="393" save-restore="no" type="int" group="csr"/>
    <reg name="sscratchcswl" bitsize="32" regnum="394" save-restore="no" type="int" group="csr"/>
    <reg name="stimecmp" bitsize="32" regnum="398" save-restore="no" type="int" group="csr"/>
    <reg name="stimecmph" bitsize="32" regnum="414" save-restore="no" type="int" group="csr"/>
    <reg name="vsstatus" bitsize="32" regnum="577" save-restore="no" type="int" group="csr"/>
    <reg name="vsie" bitsize="32" regnum="581" save-restore="no" type="int" group="csr"/>
    <reg name="vstvec" bitsize="32" regnum="582" save-restore="no" type="int" group="csr"/>
    <reg name="vsscratch" bitsize="32" regnum="641" save-restore="no" type="int" group="csr"/>
    <reg name="vsepc" bitsize="32" regnum="642" save-restore="no" type="int" group="csr"/>
    <reg name="vscause" bitsize="32" regnum="643" save-restore="no" type="int" group="csr"/>
    <reg name="vstval" bitsize="32" regnum="644" save-restore="no" type="int" group="csr"/>
    <reg name="vsip" bitsize="32" regnum="645" save-restore="no" type="int" group="csr"/>
    <reg name="vstimecmp" bitsize="32" regnum="654" save-restore="no" type="int" group="csr"/>
    <reg name="vstimecmph" bitsize="32" regnum="670" save-restore="no" type="int" group="csr"/>
    <reg name="vsatp" bitsize="32" regnum="705" save-restore="no" type="int" group="csr"/>
    <reg name="mstatus" bitsize="32" regnum="833" save-restore="no" type="int" group="csr"/>
    <reg name="misa" bitsize="32" regnum="834" save-restore="no" type="int" group="csr"/>
    <reg name="mie" bitsize="32" regnum="837" save-restore="no" type="int" group="csr"/>
    <reg name="mtvec" bitsize="32" regnum="838" save-restore="no" type="int" group="csr"/>
    <reg name="mtvt" bitsize="32" regnum="840" save-restore="no" type="int" group="csr"/>
    <reg name="mvien" bitsize="32" regnum="841" save-restore="no" type="int" group="csr"/>
    <reg name="mvip" bitsize="32" regnum="842" save-restore="no" type="int" group="csr"/>
    <reg name="menvcfg" bitsize="32" regnum="843" save-restore="no" type="int" group="csr"/>
    <reg name="mstateen0" bitsize="32" regnum="845" save-restore="no" type="int" group="csr"/>
    <reg name="mstateen1" bitsize="32" regnum="846" save-restore="no" type="int" group="csr"/>
    <reg name="mstateen2" bitsize="32" regnum="847" save-restore="no" type="int" group="csr"/>
    <reg name="mstateen3" bitsize="32" regnum="848" save-restore="no" type="int" group="csr"/>
    <reg name="mstatush" bitsize="32" regnum="849" save-restore="no" type="int" group="csr"/>
    <reg name="mieh" bitsize="32" regnum="853" save-restore="no" type="int" group="csr"/>
    <reg name="menvcfgh" bitsize="32" regnum="859" save-restore="no" type="int" group="csr"/>
    <reg name="mstateen0h" bitsize="32" regnum="861" save-restore="no" type="int" group="csr"/>
    <reg name="mstateen1h" bitsize="32" regnum="862" save-restore="no" type="int" group="csr"/>
    <reg name="mstateen2h" bitsize="32" regnum="863" save-restore="no" type="int" group="csr"/>
    <reg name="mstateen3h" bitsize="32" regnum="864" save-restore="no" type="int" group="csr"/>
    <reg name="mcountinhibit" bitsize="32" regnum="865" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent3" bitsize="32" regnum="868" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent4" bitsize="32" regnum="869" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent5" bitsize="32" regnum="870" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent6" bitsize="32" regnum="871" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent7" bitsize="32" regnum="872" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent8" bitsize="32" regnum="873" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent9" bitsize="32" regnum="874" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent10" bitsize="32" regnum="875" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent11" bitsize="32" regnum="876" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent12" bitsize="32" regnum="877" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent13" bitsize="32" regnum="878" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent14" bitsize="32" regnum="879" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent15" bitsize="32" regnum="880" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent16" bitsize="32" regnum="881" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent17" bitsize="32" regnum="882" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent18" bitsize="32" regnum="883" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent19" bitsize="32" regnum="884" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent20" bitsize="32" regnum="885" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent21" bitsize="32" regnum="886" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent22" bitsize="32" regnum="887" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent23" bitsize="32" regnum="888" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent24" bitsize="32" regnum="889" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent25" bitsize="32" regnum="890" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent26" bitsize="32" regnum="891" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent27" bitsize="32" regnum="892" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent28" bitsize="32" regnum="893" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent29" bitsize="32" regnum="894" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent30" bitsize="32" regnum="895" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent31" bitsize="32" regnum="896" save-restore="no" type="int" group="csr"/>
    <reg name="mscratch" bitsize="32" regnum="897" save-restore="no" type="int" group="csr"/>
    <reg name="mepc" bitsize="32" regnum="898" save-restore="no" type="int" group="csr"/>
    <reg name="mcause" bitsize="32" regnum="899" save-restore="no" type="int" group="csr"/>
    <reg name="mtval" bitsize="32" regnum="900" save-restore="no" type="int" group="csr"/>
    <reg name="mip" bitsize="32" regnum="901" save-restore="no" type="int" group="csr"/>
    <reg name="mnxti" bitsize="32" regnum="902" save-restore="no" type="int" group="csr"/>
    <reg name="mintstatus" bitsize="32" regnum="903" save-restore="no" type="int" group="csr"/>
    <reg name="mscratchcsw" bitsize="32" regnum="905" save-restore="no" type="int" group="csr"/>
    <reg name="mscratchcswl" bitsize="32" regnum="906" save-restore="no" type="int" group="csr"/>
    <reg name="mtinst" bitsize="32" regnum="907" save-restore="no" type="int" group="csr"/>
    <reg name="mtval2" bitsize="32" regnum="908" save-restore="no" type="int" group="csr"/>
    <reg name="miselect" bitsize="32" regnum="913" save-restore="no" type="int" group="csr"/>
    <reg name="mireg" bitsize="32" regnum="914" save-restore="no" type="int" group="csr"/>
    <reg name="miph" bitsize="32" regnum="917" save-restore="no" type="int" group="csr"/>
    <reg name="mtopei" bitsize="32" regnum="925" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg0" bitsize="32" regnum="993" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg1" bitsize="32" regnum="994" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg2" bitsize="32" regnum="995" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg3" bitsize="32" regnum="996" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg4" bitsize="32" regnum="997" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg5" bitsize="32" regnum="998" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg6" bitsize="32" regnum="999" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg7" bitsize="32" regnum="1000" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg8" bitsize="32" regnum="1001" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg9" bitsize="32" regnum="1002" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg10" bitsize="32" regnum="1003" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg11" bitsize="32" regnum="1004" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg12" bitsize="32" regnum="1005" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg13" bitsize="32" regnum="1006" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg14" bitsize="32" regnum="1007" save-restore="no" type="int" group="csr"/>
    <reg name="pmpcfg15" bitsize="32" regnum="1008" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr0" bitsize="32" regnum="1009" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr1" bitsize="32" regnum="1010" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr2" bitsize="32" regnum="1011" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr3" bitsize="32" regnum="1012" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr4" bitsize="32" regnum="1013" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr5" bitsize="32" regnum="1014" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr6" bitsize="32" regnum="1015" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr7" bitsize="32" regnum="1016" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr8" bitsize="32" regnum="1017" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr9" bitsize="32" regnum="1018" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr10" bitsize="32" regnum="1019" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr11" bitsize="32" regnum="1020" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr12" bitsize="32" regnum="1021" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr13" bitsize="32" regnum="1022" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr14" bitsize="32" regnum="1023" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr15" bitsize="32" regnum="1024" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr16" bitsize="32" regnum="1025" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr17" bitsize="32" regnum="1026" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr18" bitsize="32" regnum="1027" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr19" bitsize="32" regnum="1028" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr20" bitsize="32" regnum="1029" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr21" bitsize="32" regnum="1030" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr22" bitsize="32" regnum="1031" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr23" bitsize="32" regnum="1032" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr24" bitsize="32" regnum="1033" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr25" bitsize="32" regnum="1034" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr26" bitsize="32" regnum="1035" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr27" bitsize="32" regnum="1036" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr28" bitsize="32" regnum="1037" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr29" bitsize="32" regnum="1038" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr30" bitsize="32" regnum="1039" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr31" bitsize="32" regnum="1040" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr32" bitsize="32" regnum="1041" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr33" bitsize="32" regnum="1042" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr34" bitsize="32" regnum="1043" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr35" bitsize="32" regnum="1044" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr36" bitsize="32" regnum="1045" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr37" bitsize="32" regnum="1046" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr38" bitsize="32" regnum="1047" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr39" bitsize="32" regnum="1048" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr40" bitsize="32" regnum="1049" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr41" bitsize="32" regnum="1050" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr42" bitsize="32" regnum="1051" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr43" bitsize="32" regnum="1052" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr44" bitsize="32" regnum="1053" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr45" bitsize="32" regnum="1054" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr46" bitsize="32" regnum="1055" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr47" bitsize="32" regnum="1056" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr48" bitsize="32" regnum="1057" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr49" bitsize="32" regnum="1058" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr50" bitsize="32" regnum="1059" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr51" bitsize="32" regnum="1060" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr52" bitsize="32" regnum="1061" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr53" bitsize="32" regnum="1062" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr54" bitsize="32" regnum="1063" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr55" bitsize="32" regnum="1064" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr56" bitsize="32" regnum="1065" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr57" bitsize="32" regnum="1066" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr58" bitsize="32" regnum="1067" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr59" bitsize="32" regnum="1068" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr60" bitsize="32" regnum="1069" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr61" bitsize="32" regnum="1070" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr62" bitsize="32" regnum="1071" save-restore="no" type="int" group="csr"/>
    <reg name="pmpaddr63" bitsize="32" regnum="1072" save-restore="no" type="int" group="csr"/>
    <reg name="scontext" bitsize="32" regnum="1513" save-restore="no" type="int" group="csr"/>
    <reg name="hstatus" bitsize="32" regnum="1601" save-restore="no" type="int" group="csr"/>
    <reg name="hedeleg" bitsize="32" regnum="1603" save-restore="no" type="int" group="csr"/>
    <reg name="hideleg" bitsize="32" regnum="1604" save-restore="no" type="int" group="csr"/>
    <reg name="hie" bitsize="32" regnum="1605" save-restore="no" type="int" group="csr"/>
    <reg name="htimedelta" bitsize="32" regnum="1606" save-restore="no" type="int" group="csr"/>
    <reg name="hcounteren" bitsize="32" regnum="1607" save-restore="no" type="int" group="csr"/>
    <reg name="hgeie" bitsize="32" regnum="1608" save-restore="no" type="int" group="csr"/>
    <reg name="henvcfg" bitsize="32" regnum="1611" save-restore="no" type="int" group="csr"/>
    <reg name="hstateen0" bitsize="32" regnum="1613" save-restore="no" type="int" group="csr"/>
    <reg name="hstateen1" bitsize="32" regnum="1614" save-restore="no" type="int" group="csr"/>
    <reg name="hstateen2" bitsize="32" regnum="1615" save-restore="no" type="int" group="csr"/>
    <reg name="hstateen3" bitsize="32" regnum="1616" save-restore="no" type="int" group="csr"/>
    <reg name="htimedeltah" bitsize="32" regnum="1622" save-restore="no" type="int" group="csr"/>
    <reg name="henvcfgh" bitsize="32" regnum="1627" save-restore="no" type="int" group="csr"/>
    <reg name="hstateen0h" bitsize="32" regnum="1629" save-restore="no" type="int" group="csr"/>
    <reg name="hstateen1h" bitsize="32" regnum="1630" save-restore="no" type="int" group="csr"/>
    <reg name="hstateen2h" bitsize="32" regnum="1631" save-restore="no" type="int" group="csr"/>
    <reg name="hstateen3h" bitsize="32" regnum="1632" save-restore="no" type="int" group="csr"/>
    <reg name="htval" bitsize="32" regnum="1668" save-restore="no" type="int" group="csr"/>
    <reg name="hip" bitsize="32" regnum="1669" save-restore="no" type="int" group="csr"/>
    <reg name="hvip" bitsize="32" regnum="1670" save-restore="no" type="int" group="csr"/>
    <reg name="htinst" bitsize="32" regnum="1675" save-restore="no" type="int" group="csr"/>
    <reg name="hgatp" bitsize="32" regnum="1729" save-restore="no" type="int" group="csr"/>
    <reg name="hcontext" bitsize="32" regnum="1769" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent3h" bitsize="32" regnum="1892" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent4h" bitsize="32" regnum="1893" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent5h" bitsize="32" regnum="1894" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent6h" bitsize="32" regnum="1895" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent7h" bitsize="32" regnum="1896" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent8h" bitsize="32" regnum="1897" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent9h" bitsize="32" regnum="1898" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent10h" bitsize="32" regnum="1899" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent11h" bitsize="32" regnum="1900" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent12h" bitsize="32" regnum="1901" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent13h" bitsize="32" regnum="1902" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent14h" bitsize="32" regnum="1903" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent15h" bitsize="32" regnum="1904" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent16h" bitsize="32" regnum="1905" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent17h" bitsize="32" regnum="1906" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent18h" bitsize="32" regnum="1907" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent19h" bitsize="32" regnum="1908" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent20h" bitsize="32" regnum="1909" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent21h" bitsize="32" regnum="1910" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent22h" bitsize="32" regnum="1911" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent23h" bitsize="32" regnum="1912" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent24h" bitsize="32" regnum="1913" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent25h" bitsize="32" regnum="1914" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent26h" bitsize="32" regnum="1915" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent27h" bitsize="32" regnum="1916" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent28h" bitsize="32" regnum="1917" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent29h" bitsize="32" regnum="1918" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent30h" bitsize="32" regnum="1919" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmevent31h" bitsize="32" regnum="1920" save-restore="no" type="int" group="csr"/>
    <reg name="mseccfg" bitsize="32" regnum="1928" save-restore="no" type="int" group="csr"/>
    <reg name="mseccfgh" bitsize="32" regnum="1944" save-restore="no" type="int" group="csr"/>
    <reg name="tselect" bitsize="32" regnum="2017" save-restore="no" type="int" group="csr"/>
    <reg name="tdata1" bitsize="32" regnum="2018" save-restore="no" type="int" group="csr"/>
    <reg name="tdata2" bitsize="32" regnum="2019" save-restore="no" type="int" group="csr"/>
    <reg name="tdata3" bitsize="32" regnum="2020" save-restore="no" type="int" group="csr"/>
    <reg name="tinfo" bitsize="32" regnum="2021" save-restore="no" type="int" group="csr"/>
    <reg name="tcontrol" bitsize="32" regnum="2022" save-restore="no" type="int" group="csr"/>
    <reg name="mcontext" bitsize="32" regnum="2025" save-restore="no" type="int" group="csr"/>
    <reg name="mscontext" bitsize="32" regnum="2027" save-restore="no" type="int" group="csr"/>
    <reg name="dcsr" bitsize="32" regnum="2033" save-restore="no" type="int" group="csr"/>
    <reg name="dpc" bitsize="32" regnum="2034" save-restore="no" type="int" group="csr"/>
    <reg name="dscratch0" bitsize="32" regnum="2035" save-restore="no" type="int" group="csr"/>
    <reg name="dscratch1" bitsize="32" regnum="2036" save-restore="no" type="int" group="csr"/>
    <reg name="mcycle" bitsize="32" regnum="2881" save-restore="no" type="int" group="csr"/>
    <reg name="minstret" bitsize="32" regnum="2883" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter3" bitsize="32" regnum="2884" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter4" bitsize="32" regnum="2885" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter5" bitsize="32" regnum="2886" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter6" bitsize="32" regnum="2887" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter7" bitsize="32" regnum="2888" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter8" bitsize="32" regnum="2889" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter9" bitsize="32" regnum="2890" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter10" bitsize="32" regnum="2891" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter11" bitsize="32" regnum="2892" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter12" bitsize="32" regnum="2893" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter13" bitsize="32" regnum="2894" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter14" bitsize="32" regnum="2895" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter15" bitsize="32" regnum="2896" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter16" bitsize="32" regnum="2897" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter17" bitsize="32" regnum="2898" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter18" bitsize="32" regnum="2899" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter19" bitsize="32" regnum="2900" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter20" bitsize="32" regnum="2901" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter21" bitsize="32" regnum="2902" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter22" bitsize="32" regnum="2903" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter23" bitsize="32" regnum="2904" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter24" bitsize="32" regnum="2905" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter25" bitsize="32" regnum="2906" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter26" bitsize="32" regnum="2907" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter27" bitsize="32" regnum="2908" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter28" bitsize="32" regnum="2909" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter29" bitsize="32" regnum="2910" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter30" bitsize="32" regnum="2911" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter31" bitsize="32" regnum="2912" save-restore="no" type="int" group="csr"/>
    <reg name="mcycleh" bitsize="32" regnum="3009" save-restore="no" type="int" group="csr"/>
    <reg name="minstreth" bitsize="32" regnum="3011" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter3h" bitsize="32" regnum="3012" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter4h" bitsize="32" regnum="3013" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter5h" bitsize="32" regnum="3014" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter6h" bitsize="32" regnum="3015" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter7h" bitsize="32" regnum="3016" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter8h" bitsize="32" regnum="3017" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter9h" bitsize="32" regnum="3018" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter10h" bitsize="32" regnum="3019" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter11h" bitsize="32" regnum="3020" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter12h" bitsize="32" regnum="3021" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter13h" bitsize="32" regnum="3022" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter14h" bitsize="32" regnum="3023" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter15h" bitsize="32" regnum="3024" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter16h" bitsize="32" regnum="3025" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter17h" bitsize="32" regnum="3026" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter18h" bitsize="32" regnum="3027" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter19h" bitsize="32" regnum="3028" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter20h" bitsize="32" regnum="3029" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter21h" bitsize="32" regnum="3030" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter22h" bitsize="32" regnum="3031" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter23h" bitsize="32" regnum="3032" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter24h" bitsize="32" regnum="3033" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter25h" bitsize="32" regnum="3034" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter26h" bitsize="32" regnum="3035" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter27h" bitsize="32" regnum="3036" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter28h" bitsize="32" regnum="3037" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter29h" bitsize="32" regnum="3038" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter30h" bitsize="32" regnum="3039" save-restore="no" type="int" group="csr"/>
    <reg name="mhpmcounter31h" bitsize="32" regnum="3040" save-restore="no" type="int" group="csr"/>
    <reg name="cycle" bitsize="32" regnum="3137" save-restore="no" type="int" group="csr"/>
    <reg name="time" bitsize="32" regnum="3138" save-restore="no" type="int" group="csr"/>
    <reg name="instret" bitsize="32" regnum="3139" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter3" bitsize="32" regnum="3140" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter4" bitsize="32" regnum="3141" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter5" bitsize="32" regnum="3142" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter6" bitsize="32" regnum="3143" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter7" bitsize="32" regnum="3144" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter8" bitsize="32" regnum="3145" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter9" bitsize="32" regnum="3146" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter10" bitsize="32" regnum="3147" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter11" bitsize="32" regnum="3148" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter12" bitsize="32" regnum="3149" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter13" bitsize="32" regnum="3150" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter14" bitsize="32" regnum="3151" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter15" bitsize="32" regnum="3152" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter16" bitsize="32" regnum="3153" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter17" bitsize="32" regnum="3154" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter18" bitsize="32" regnum="3155" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter19" bitsize="32" regnum="3156" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter20" bitsize="32" regnum="3157" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter21" bitsize="32" regnum="3158" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter22" bitsize="32" regnum="3159" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter23" bitsize="32" regnum="3160" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter24" bitsize="32" regnum="3161" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter25" bitsize="32" regnum="3162" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter26" bitsize="32" regnum="3163" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter27" bitsize="32" regnum="3164" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter28" bitsize="32" regnum="3165" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter29" bitsize="32" regnum="3166" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter30" bitsize="32" regnum="3167" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter31" bitsize="32" regnum="3168" save-restore="no" type="int" group="csr"/>
    <reg name="cycleh" bitsize="32" regnum="3265" save-restore="no" type="int" group="csr"/>
    <reg name="timeh" bitsize="32" regnum="3266" save-restore="no" type="int" group="csr"/>
    <reg name="instreth" bitsize="32" regnum="3267" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter3h" bitsize="32" regnum="3268" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter4h" bitsize="32" regnum="3269" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter5h" bitsize="32" regnum="3270" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter6h" bitsize="32" regnum="3271" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter7h" bitsize="32" regnum="3272" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter8h" bitsize="32" regnum="3273" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter9h" bitsize="32" regnum="3274" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter10h" bitsize="32" regnum="3275" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter11h" bitsize="32" regnum="3276" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter12h" bitsize="32" regnum="3277" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter13h" bitsize="32" regnum="3278" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter14h" bitsize="32" regnum="3279" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter15h" bitsize="32" regnum="3280" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter16h" bitsize="32" regnum="3281" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter17h" bitsize="32" regnum="3282" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter18h" bitsize="32" regnum="3283" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter19h" bitsize="32" regnum="3284" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter20h" bitsize="32" regnum="3285" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter21h" bitsize="32" regnum="3286" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter22h" bitsize="32" regnum="3287" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter23h" bitsize="32" regnum="3288" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter24h" bitsize="32" regnum="3289" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter25h" bitsize="32" regnum="3290" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter26h" bitsize="32" regnum="3291" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter27h" bitsize="32" regnum="3292" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter28h" bitsize="32" regnum="3293" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter29h" bitsize="32" regnum="3294" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter30h" bitsize="32" regnum="3295" save-restore="no" type="int" group="csr"/>
    <reg name="hpmcounter31h" bitsize="32" regnum="3296" save-restore="no" type="int" group="csr"/>
    <reg name="scountovf" bitsize="32" regnum="3553" save-restore="no" type="int" group="csr"/>
    <reg name="hgeip" bitsize="32" regnum="3667" save-restore="no" type="int" group="csr"/>
    <reg name="mvendorid" bitsize="32" regnum="3922" save-restore="no" type="int" group="csr"/>
    <reg name="marchid" bitsize="32" regnum="3923" save-restore="no" type="int" group="csr"/>
    <reg name="mimpid" bitsize="32" regnum="3924" save-restore="no" type="int" group="csr"/>
    <reg name="mhartid" bitsize="32" regnum="3925" save-restore="no" type="int" group="csr"/>
    <reg name="mconfigptr" bitsize="32" regnum="3926" save-restore="no" type="int" group="csr"/>
    <reg name="mtopi" bitsize="32" regnum="4081" save-restore="no" type="int" group="csr"/>
  </feature>
  <feature name="org.gnu.gdb.riscv.virtual">
    <reg name="priv" bitsize="8" regnum="4161" save-restore="no" type="int" group="general"/>
  </feature>
</target>