https://github.com/svenssonjoel/cortex_m_mcgee
ARM Cortex M0-4 machine code generator
https://github.com/svenssonjoel/cortex_m_mcgee
assembler cortex-m cortex-m0 cortex-m3 cortex-m4 machinecode
Last synced: about 1 month ago
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ARM Cortex M0-4 machine code generator
- Host: GitHub
- URL: https://github.com/svenssonjoel/cortex_m_mcgee
- Owner: svenssonjoel
- License: mit
- Created: 2020-09-03T06:42:57.000Z (over 4 years ago)
- Default Branch: master
- Last Pushed: 2020-09-24T06:34:32.000Z (over 4 years ago)
- Last Synced: 2025-02-10T13:12:01.373Z (3 months ago)
- Topics: assembler, cortex-m, cortex-m0, cortex-m3, cortex-m4, machinecode
- Language: C
- Homepage:
- Size: 85.9 KB
- Stars: 2
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# Cortex M. McGee
ARM Cortex M0-4 machine code generator
_WORK IN PROGRESS_
# Debug on stm32f4-discovery GDB
- Run the `debug.sh` to start OpenOCD and connect to the board
- Start gdb (`arm-none-eabi-gdb`)
- Issue command `target extended-remote localhost:3333` or short version `tar ext :3333`
# Debug on stm32f4-discovery Telnet
- Run the `debug.sh` to start OpenOCD and connect to the board
- Telnet `telnet localhost 4444`
- load binary code into memory with command: `load_image filename address`
For example: `load_image out.bin 0x20000000`
- Disassemble loaded code `arm disassemble address number-of-instructions`
Example:
```
> arm disassemble 0x20000000 10
0x20000000 0x20ff MOVS r0, #0xff
0x20000002 0x21de MOVS r1, #0xde
0x20000004 0x22ad MOVS r2, #0xad
0x20000006 0x230f MOVS r3, #0x0f
0x20000008 0x24f0 MOVS r4, #0xf0
0x2000000a 0x25ab MOVS r5, #0xab
0x2000000c 0x26dc MOVS r6, #0xdc
0x2000000e 0x2712 MOVS r7, #0x12
0x20000010 0x2043 MOVS r0, #0x43
0x20000012 0x2199 MOVS r1, #0x99
```
- Display registers contents: `reg`
- Set register contents: `reg name value`
Example: `reg pc 0x20000000`
- Set breakpoint `bp address length`
Example: `bp 0x20000012 2`
- Run: `resume`
- Step through code: `step`
# Quick debug with xxd
- View binary file contents as HEX values: `xxd filename`
- View binary file contents as BIN values: `xxd -b filename`
# To figure out
- Byte ordering for 32bit thumb
- Generation of elf header and sections.