Performing Standalone Application Debug |
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Xilinx® System Command-line Tool (XSCT) can be used to debug standalone applications on one or more processor cores simultaneously. The first step involved in debugging is to connect to hw_server and select a debug target. You can now reset the system/processor core, initialize the PS if needed, program the FPGA, download an elf, set breakpoints, run the program, examine the stack trace, view local/global variables. Below is an example XSCT session that demonstrates standalone application debug on Zynq® - 7000 AP SoC. Comments begin with #. #connect to remote hw_server by specifying its url. #If the hardware is connected to a local machine,-url option and the #are not needed. connect command returns the channel ID of the connection xsct% connect -url TCP:xhdbfarmc7:3121 tcfchan#0 # List available targets and select a target through its id. #The targets are assigned IDs as they are discovered on the Jtag chain, #so the IDs can change from session to session. #For non-interactive usage, -filter option can be used to select a target, #instead of selecting the target through its ID xsct% targets 1 APU 2 ARM Cortex-A9 MPCore #0 (Running) 3 ARM Cortex-A9 MPCore #1 (Running) 4 xc7z020 xsct% targets 2 # Reset the system before initializing the PS and configuring the FPGA xsct% rst # Info messages are displayed when the status of a core changes Info: ARM Cortex-A9 MPCore #0 (target 2) Stopped at 0xfffffe1c (Suspended) Info: ARM Cortex-A9 MPCore #1 (target 3) Stopped at 0xfffffe18 (Suspended) # Configure the FPGA. When the active target is not a FPGA device, #the first FPGA device is configured xsct% fpga ZC702_HwPlatform/design_1_wrapper.bit 100% 3MB 1.8MB/s 00:02 # Run loadhw command to make the debugger aware of the processor cores’ memory map xsct% loadhw ZC702_HwPlatform/system.hdf design_1_wrapper # Source the ps7_init.tcl script and run ps7_init and ps7_post_config commands xsct% source ZC702_HwPlatform/ps7_init.tcl xsct% ps7_init xsct% ps7_post_config # Download the application program xsct% dow dhrystone/Debug/dhrystone.elf Downloading Program -- dhrystone/Debug/dhrystone.elf section, .text: 0x00100000 - 0x001037f3 section, .init: 0x001037f4 - 0x0010380b section, .fini: 0x0010380c - 0x00103823 section, .rodata: 0x00103824 - 0x00103e67 section, .data: 0x00103e68 - 0x001042db section, .eh_frame: 0x001042dc - 0x0010434f section, .mmu_tbl: 0x00108000 - 0x0010bfff section, .init_array: 0x0010c000 - 0x0010c007 section, .fini_array: 0x0010c008 - 0x0010c00b section, .bss: 0x0010c00c - 0x0010e897 section, .heap: 0x0010e898 - 0x0010ec9f section, .stack: 0x0010eca0 - 0x0011149f 100% 0MB 0.3MB/s 00:00 Setting PC to Program Start Address 0x00100000 Successfully downloaded dhrystone/Debug/dhrystone.elf # Set a breakpoint at main() xsct% bpadd -addr &main 0 # Resume the processor core xsct% con # Info message is displayed when the core hits the breakpoint xsct% Info: ARM Cortex-A9 MPCore #0 (target 2) Stopped at 0x1005a4 (Breakpoint) # Registers can be viewed when the core is stopped xsct% rrd r0: 00000000 r1: 00000000 r2: 0010e898 r3: 001042dc r4: 00000003 r5: 0000001e r6: 0000ffff r7: f8f00000 r8: 00000000 r9: ffffffff r10: 00000000 r11: 00000000 r12: 0010fc90 sp: 0010fca0 lr: 001022d8 pc: 001005a4 cpsr: 600000df usr fiq irq abt und svc mon vfp cp15 Jazelle # Memory contents can be displayed xsct% mrd 0xe000d000 E000D000: 800A0000 # Local variables can be viewed xsct% locals Int_1_Loc : 1113232 Int_2_Loc : 30 Int_3_Loc : 0 Ch_Index : 0 Enum_Loc : 0 Str_1_Loc : char[31] Str_2_Loc : char[31] Run_Index : 1061232 Number_Of_Runs : 2 # Local variable value can be modified xsct% locals Number_Of_Runs 100 xsct% locals Number_Of_Runs Number_Of_Runs : 100 # Global variables and be displayed, and its value can be modified xsct% print Int_Glob Int_Glob : 0 xsct% print -set Int_Glob 23 xsct% print Int_Glob Int_Glob : 23 # Expressions can be evaluated and its value can be displayed xsct% print Int_Glob + 1 * 2 Int_Glob + 1 * 2 : 25 # Step over a line of source code xsct% nxt Info: ARM Cortex-A9 MPCore #0 (target 2) Stopped at 0x1005b0 (Step) # View stack trace xsct% bt 0 0x1005b0 main()+12: ../src/dhry_1.c, line 91 1 0x1022d8 _start()+88 2 unknown-pc # Set a breakpoint at exit and resume execution xsct% bpadd -addr &exit 1 xsct% con Info: ARM Cortex-A9 MPCore #0 (target 2) Running xsct% Info: ARM Cortex-A9 MPCore #0 (target 2) Stopped at 0x103094 (Breakpoint) xsct% bt 0 0x103094 exit() 1 0x1022e0 _start()+96 2 unknown-pcWhile a program is running on A9 #0, users can download another elf onto A9 #1 and debug it, using similar steps. Note that, it’s not necessary to re-connect to the hw_server, initialize the PS or configure the FPGA in such cases. Users can just select A9 #1 target and download the elf and continue with further debug. |
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