[GitHub] [incubator-nuttx] xiaoxiang781216 opened a new pull request #3075: arch/arm: Fix syscall number out of swi range in thumb mode

[GitBox]

xiaoxiang781216 opened a new pull request #3075:
URL: https://github.com/apache/incubator-nuttx/pull/3075


   ## Summary
   The immediate number is 8bits in thumb mode:
   ```
   +---------------------+---------------+
   |15 14 13 12 11 10 9 8|7 6 5 4 3 2 1 0|
   +---------------------+---------------+
   | 1  1  0  1  1  1 1 1|      imm8     |
   +---------------------+---------------+
   ```
   The immediate number is 24bits in arm mode:
   ```
   
+-----------+-------------------------------------------------------------------------+
   |31 30 29 28|27 26 25 24|23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 
4 3 2 1 0|
   
+-----------+-----------+-------------------------------------------------------------+
   |   cond    | 1  1  1  1|                                imm24               
         |
   
+-----------+-----------+-------------------------------------------------------------+
   ```
   
   ## Impact
   Fix the build error in thumb mode when syscall is enabled
   
   ## Testing
   
   


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