Python module for GDB to analyze ARM core registers
Project description
arm-gdb
Tools for inspecting ARM Cortex-M registers within GDB
Currently supported:
- SCB - System Control Block
- SysTick
- NVIC - Nested Vectored Interrupt Controller
Install
pip install arm-gdb
Run
Start GDB and run
python import arm_gdb
Or add that line to ~/.gdbinit
Usage
Use help arm command, or individual subcommands, i.e. help arm scb
(gdb) help arm
Tools for debugging ARM Cortex-M - series CPUs
List of arm subcommands:
arm inspect -- Dump register values from device peripheral
arm list -- List peripherals and registers from device
arm loaddb -- Load an SVD file from resitry
arm loadfile -- Load an SVD file from file
arm nvic -- Print current status of NVIC
arm scb -- Dump of ARM Cortex-M SCB - System Control Block
arm systick -- Dump of ARM Cortex-M SysTick block
Type "help arm" followed by arm subcommand name for full documentation.
Type "apropos word" to search for commands related to "word".
Type "apropos -v word" for full documentation of commands related to "word".
Command name abbreviations are allowed if unambiguous.
Exmaples
Dump of ARM System Control Block, with bitmask descriptions
(gdb) arm scb /h
ACTLR = 00000000 // Auxiliary Control Register
CPUID = 410fc241 // CPUID Base Register
Revision .......1 - 1
PartNo ....c24. - c24
Constant ...f.... - f
Implementer 41...... - 41
ICSR = 00c21000 // Interrupt Control and State Register
VECTPENDING ...21... - 21
ISRPENDING ..4..... - 1
Reserved for Debug use ..8..... - 1
VTOR = 00000000 // Vector Table Offset Register
AIRCR = fa050000 // Application Interrupt and Reset Control Register
VECTKEY fa05.... - fa05
SCR = 00000000 // System Control Register
CCR = 00000200 // Configuration and Control Register
STKALIGN .....2.. - 1
SHPR1 = 00000000 // System Handler Priority Register 1
SHPR2 = 80000000 // System Handler Priority Register 2
PRI_11 - SVCall 80...... - 80
SHPR3 = 00e00000 // System Handler Priority Register 3
PRI_14 - PendSV ..e0.... - e0
SHCRS = 00070000 // System Handler Control and State Register
MEMFAULTENA ...1.... - 1
BUSFAULTENA ...2.... - 1
USGFAULTENA ...4.... - 1
CFSR = 00000000 // Configurable Fault Status Register
MMFSR = 00 // MemManage Fault Status Register
MMFAR = e000edf8 // MemManage Fault Address Register
BFSR = 00 // BusFault Status Register
BFAR = e000edf8 // BusFault Address Register
UFSR = 0000 // UsageFault Status Register
HFSR = 00000000 // HardFault Status Register
AFSR = 00000000 // Auxiliary Fault Status Register
Dump of ARM SysTick
(gdb) arm systick
SYST_CSR = 00000004
CLKSOURCE .......4 - 1
SYST_RVR = 00000000
SYST_CVR = 00000000
SYST_CALIB = c0000000
SKEW 4....... - 1
NOREF 8....... - 1
... or with descriptions
(gdb) arm systick /h
SYST_CSR = 00000004 // SysTick Control and Status Register
CLKSOURCE .......4 - 1
SYST_RVR = 00000000 // SysTick Reload Value Register
SYST_CVR = 00000000 // SysTick Current Value Register
SYST_CALIB = c0000000 // SysTick Calibration Value Register
SKEW 4....... - 1
NOREF 8....... - 1
... or with bitmasks in binary
(gdb) arm systick /b
SYST_CSR = 00000000000000000000000000000100
CLKSOURCE .............................1.. - 1
SYST_RVR = 00000000000000000000000000000000
SYST_CVR = 00000000000000000000000000000000
SYST_CALIB = 11000000000000000000000000000000
SKEW .1.............................. - 1
NOREF 1............................... - 1
Print out all fields, even those with default values:
(gdb) arm systick /ab
SYST_CSR = 00000000000000000000000000000100
ENABLE ...............................0 - 0
TICKINT ..............................0. - 0
CLKSOURCE .............................1.. - 1
COUNTFLAG ...............0................ - 0
SYST_RVR = 00000000000000000000000000000000
RELOAD ........000000000000000000000000 - 000000
SYST_CVR = 00000000000000000000000000000000
CURRENT ........000000000000000000000000 - 000000
SYST_CALIB = 11000000000000000000000000000000
TENMS .......0000000000000000000000000 - 0000000
SKEW .1.............................. - 1
NOREF 1............................... - 1
Dump of NVIC list, listing all enabled interrupt handlers, in a redirected interrupt vector
Default, it checks for functions in the active interrupt vector given VTOR register. But in for example nRF52840 using their SoftDevice, the interrupts are forwarded in software to the application for SoftDevice to override.
(gdb) arm nvic 80 &__isr_vector
IRQn Prio Handler
-15 0 en 0002a749 Reset -
-14 0 en 0002a771 NMI -
-13 0 en 0002bc55 HardFault HardFault_Handler
-12 0 en 0002bc5d MemManage
-11 0 en 0002bc59 BusFault
-10 0 en 0002bc61 UsageFault
-5 80 en 00027201 SVC SVC_Handler
-2 e0 en 00027231 PendSV PendSV_Handler
0 80 en 00027715 POWER_CLOCK_IRQHandler
2 40 en 0002c409 UARTE0_UART0_IRQHandler
11 0 en 0002a783 -
17 c0 en pend 0002bd4d RTC1_IRQHandler
21 40 en 0002bd55 SWI1_EGU1_IRQHandler
22 c0 en 000279e9 SWI2_EGU2_IRQHandler
23 a0 en 0002c035 SWI3_EGU3_IRQHandler
25 80 en 0002a783 -
32 20 en 0002a783 -
To use an SVD file from cmsis-svd package database, use:
This loads in the device description under a local name, in this case nrf for
faster access in upcoming commands
(gdb) arm loaddb nrf52 Nordic nrf52.svd
(gdb) arm loadfile stm32f7x7 /path/to/my/stm32f7x7.svd
(gdb) arm list nrf
FICR @ 0x10000000
UICR @ 0x10001000
BPROT @ 0x40000000
POWER @ 0x40000000
...
It is possible to inspect the values of the registers on the target
(gdb) arm inspect nrf52840 NVMC
NVMC.READY = 00000001
READY .......1 - Ready
NVMC.READYNEXT = 00000001
READYNEXT .......1 - Ready
NVMC.CONFIG = 00000000
WEN .......0 - Ren
NVMC.ERASEPAGE = 00000000
NVMC.ERASEPCR1 = 00000000
NVMC.ERASEALL = 00000000
ERASEALL .......0 - NoOperation
NVMC.ERASEPCR0 = 00000000
NVMC.ERASEUICR = 00000000
ERASEUICR .......0 - NoOperation
NVMC.ERASEPAGEPARTIAL = 00000000
NVMC.ERASEPAGEPARTIALCFG = 0000000a
DURATION ......0a - 0a
NVMC.ICACHECNF = 00000001
CACHEEN .......1 - Enabled
CACHEPROFEN .....0.. - Disabled
NVMC.IHIT = 00000000
NVMC.IMISS = 00000000
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