[Bug 1001124] New: Cortex M - stack corruption

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           Summary: Cortex M - stack corruption
           Product: eCos
           Version: CVS
          Platform: All
        OS/Version: Cortex-M
            Status: UNCONFIRMED
          Severity: normal
          Priority: low
         Component: HAL
        AssignedTo: unassigned@bugs.ecos.sourceware.org
        ReportedBy: ecos@hotmail.co.uk
                CC: ecos-bugs@ecos.sourceware.org
             Class: Advice Request


It is possible to corrupt the stack during the board initialisation when
compiling a ROM application with the KERNEL package.

The RTC clock is started from cyg_hal_invoke_constructors() and, at this point,
the main stack pointer (MSP) and the thread stack pointer (PSP) are equal. In
case the eCos scheduler has not switched the PSP to a thread stack before the
first RTC interrupt happens, the stack get corrupted. This typically happens if
you have some debugging diag_printf in some of the constructors.

Christophe

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