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Posted to commits@nuttx.apache.org by "raiden00pl (via GitHub)" <gi...@apache.org> on 2026/10/21 12:38:50 UTC

[PR] arch/arm: keep g_running_tasks valid on ARMv6-M [nuttx]

raiden00pl opened a new pull request, #20871:
URL: https://github.com/apache/nuttx/pull/20871

   
   ## Summary
   
       d20189bdfa2 made up_exit() and the ARMv6-M arm_sigdeliver() set
       g_running_tasks to NULL before SYS_restore_context, so that the ARMv6-M
       arm_doirq() skips saving the registers into it. That NULL is passed to
       nxsched_switch_context(), which dereferences it; with tickless
       round-robin this locked up the STM32F0.
       
       d20189bdfa2 replaced the check of the SVCall number and R0, because on
       ARMv6-M the SVC arrives as HardFault when issued with PRIMASK set
       (ARMv6-M ARM, DDI 0419E, B1.5.4). Restore that check, accepting SVCall
       and HardFault, and remove the NULL from up_exit() and arm_sigdeliver().
   
   ## Impact
   
   bug fix
   
   ## Testing
   
   NUCLEO-F091RC (Cortex-M0) and NUCLEO-U083RC (Cortex-M0+) with systick and tickless


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Re: [PR] arch/arm: keep g_running_tasks valid on ARMv6-M [nuttx]

Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.

github-actions[bot] commented on PR #20871:
URL: https://github.com/apache/nuttx/pull/20871#issuecomment-6328211312

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Re: [PR] arch/arm: keep g_running_tasks valid on ARMv6-M [nuttx]

Posted by "acassis (via GitHub)" <gi...@apache.org>.

acassis merged PR #20871:
URL: https://github.com/apache/nuttx/pull/20871


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