Eclipse J-Link ATMEL ARM ATSAME70Q21。当代码从不同于 0x00400000 的地址开始时进行调试

Posted 2023-02-22

【中文标题】Eclipse J-Link ATMEL ARM ATSAME70Q21。当代码从不同于 0x00400000 的地址开始时进行调试

【英文标题】：Eclipse J-Link ATMEL ARM ATSAME70Q21. Debugging when the code starts at a different address than 0x00400000

【发布时间】：2019-04-08 12:42:08

【问题描述】：

我正在尝试在 ATMEL ATSAME70Q21 上使用带有 J-Link 的 Eclipse。 当代码起始地址位于默认地址 0x00400000 时，我能够完美地调试代码。 它下载代码，在主断点处停止等。所有调试命令似乎都工作正常。

但是，当我将链接器文件上的地址更改为 0x00420000 时，代码已下载，但未命中主函数处的断点。 在控制台上可以看到很多消息（见下文）。

我试图通过在调试配置中发出以下命令将 VTOR 寄存器设置为 0x0420000 |启动 |运行/重启命令 监控 memU32 0xE000ED08 = 0x0420000 但它的行为仍然相同。 我相信 ARM 正在尝试在与内存 0x00420004 中定义的起点不同的地址执行代码......

有什么想法吗？

控制台输出可以在下面找到。 Flash 被编程和验证。 但是最后两行表明有问题...

---

SEGGER J-Link GDB Server V6.34h Command Line Version

JLinkARM.dll V6.34h (DLL compiled Oct  9 2018 15:50:01)

Command line: -if swd -device ATSAME70Q21 -endian little -speed 1000 -port 2331 -swoport 2332 -telnetport 2333 -vd -ir -localhostonly 1 -log /home/user/svn/SDCO-504/AtmelSAM-2/FreeRTOS_IP_SAME70_v3/Debug/GDBlog -singlerun -strict -timeout 0 -nogui
-----GDB Server start settings-----
GDBInit file:                  none
GDB Server Listening port:     2331
SWO raw output listening port: 2332
Terminal I/O port:             2333
Accept remote connection:      localhost only
Generate logfile:              on
Verify download:               on
Init regs on start:            on
Silent mode:                   off
Single run mode:               on
Target connection timeout:     0 ms
------J-Link related settings------
J-Link Host interface:         USB
J-Link script:                 none
J-Link settings file:          none
------Target related settings------
Target device:                 ATSAME70Q21
Target interface:              SWD
Target interface speed:        1000kHz
Target endian:                 little

Connecting to J-Link...
J-Link is connected.
Firmware: J-Link V10 compiled Sep  4 2018 11:24:21
Hardware: V10.10
SAM-ICE found !
S/N: 20125801
OEM: SAM-ICE
Feature(s): RDI, GDB
Checking target voltage...
Target voltage: 3.32 V
Listening on TCP/IP port 2331
Connecting to target...Connected to target
Waiting for GDB connection...Connected to 127.0.0.1
Reading all registers
Read 4 bytes @ address 0x00000000 (Data = 0x20459B48)
Read 2 bytes @ address 0x00000000 (Data = 0x9B48)
Received monitor command: speed 1000
Target interface speed set to 1000 kHz
Received monitor command: clrbp
Received monitor command: reset
Resetting target
Received monitor command: halt
Halting target CPU...
...Target halted (PC = 0x0040E410)
Received monitor command: regs
R0 = 00000000, R1 = 00000000, R2 = 00000000, R3 = 00000000
R4 = 00000000, R5 = 00000000, R6 = 00000000, R7 = 00000000
R8 = 00000000, R9 = 00000000, R10= 00000000, R11= 00000000
R12= 00000000, R13= 20459B48, MSP= 20459B48, PSP= 00000000
R14(LR) = FFFFFFFF, R15(PC) = 0040E410
XPSR 01000000, APSR 00000000, EPSR 01000000, IPSR 00000000
CFBP 00000000, CONTROL 00, FAULTMASK 00, BASEPRI 00, PRIMASK 00
Reading all registers
Read 4 bytes @ address 0x0040E410 (Data = 0xB084B580)
Read 2 bytes @ address 0x0040E410 (Data = 0xB580)
Received monitor command: speed auto
Select auto target interface speed (2000 kHz)
Received monitor command: flash breakpoints 1
Flash breakpoints enabled
Read 4 bytes @ address 0x0040E410 (Data = 0xB084B580)
Read 2 bytes @ address 0x0040E410 (Data = 0xB580)
Downloading 16128 bytes @ address 0x00420000 - Verified OK
Downloading 16080 bytes @ address 0x00423F00 - Verified OK
Downloading 16112 bytes @ address 0x00427DD0 - Verified OK
Downloading 16128 bytes @ address 0x0042BCC0 - Verified OK
Downloading 16064 bytes @ address 0x0042FBC0 - Verified OK
Downloading 14764 bytes @ address 0x00433A80 - Verified OK
Downloading 8 bytes @ address 0x0043742C - Verified OK
Downloading 2536 bytes @ address 0x00437434 - Verified OK
Comparing flash   [....................] Done.
Verifying flash   [....................] Done.
Writing register (PC = 0x  420000)
Read 4 bytes @ address 0x00420000 (Data = 0x20459B48)
Read 2 bytes @ address 0x00420000 (Data = 0x9B48)
Read 2 bytes @ address 0x0042FD5A (Data = 0xF7FF)
Read 2 bytes @ address 0x0042FD5A (Data = 0xF7FF)
Received monitor command: clrbp
Received monitor command: reset
Resetting target
Received monitor command: halt
Halting target CPU...
...Target halted (PC = 0x0040E410)
Received monitor command: memU32 0xE000ED08 = 0x0420000
Writing 0x00420000 @ address 0xE000ED08
Read 2 bytes @ address 0x0042FD5A (Data = 0xF7FF)
Read 2 bytes @ address 0x0042FD5A (Data = 0xF7FF)
Read 2 bytes @ address 0x0042FD5A (Data = 0xF7FF)
Received monitor command: regs
R0 = 00000000, R1 = 00000000, R2 = 00000000, R3 = 00000000
R4 = 00000000, R5 = 00000000, R6 = 00000000, R7 = 00000000
R8 = 00000000, R9 = 00000000, R10= 00000000, R11= 00000000
R12= 00000000, R13= 20459B48, MSP= 20459B48, PSP= 00000000
R14(LR) = FFFFFFFF, R15(PC) = 0040E410
XPSR 01000000, APSR 00000000, EPSR 01000000, IPSR 00000000
CFBP 00000000, CONTROL 00, FAULTMASK 00, BASEPRI 00, PRIMASK 00
Reading all registers
Read 4 bytes @ address 0x0040E410 (Data = 0xB084B580)
Read 2 bytes @ address 0x0040E410 (Data = 0xB580)
Read 2 bytes @ address 0x0042FD5A (Data = 0xF7FF)
Read 2 bytes @ address 0x0042FD5A (Data = 0xF7FF)
WARNING: Failed to read memory @ address 0xFFFFFFFE
WARNING: Failed to read memory @ address 0xFFFFFFFE

【问题讨论】：

通常这将来自您的 C 链接器，应该从那里进行更改，以便生成正确的向量表。您的应用程序代码从哪里开始无关紧要，重要的是重置向量在哪里，然后从那里获取它。重置向量将调用 CRT，该 CRT 将调用 main()。通常您可以定义启动函数的名称，然后链接器会为您处理一切。至于如何从 Total Eclipse 中做到这一点，我不知道。

【参考方案1】：

您想在地址 0xE000ED08 处设置值，因此命令必须是：

set *0xE000ED08 = 0x0420000

我也很确定您需要将堆栈指针和程序计数器设置为有意义的地址，这可以通过这种方式完成：

set $sp = *(unsigned int*)0x0420000
set $pc = *(unsigned int*)0x0420004

请记住，此设备上的程序计数器实际上提前 4 个字节。

【讨论】：

谢谢。有用。 :) 我在哪里可以找到描述这些命令（set $...）和其他命令的手册？我认为这是 GDB 服务器的命令，但我找不到任何描述可用命令的手册。只有命令行调用...

我已经从这里 (darkdust.net/files/GDB%20Cheat%20Sheet.pdf) 打印了 GDB 备忘单，并将其固定在我办公室屏幕上方的墙上。 ;) 对于其他任何内容，您可以随时查看官方文档：sourceware.org/gdb/current/onlinedocs/gdb