On 8/21/2014 4:04 PM, Christian Svensson wrote: > On Thu, Aug 21, 2014 at 9:56 PM, Joel Sherrill > <joel.sherr...@oarcorp.com> wrote: >> The sp must be updated before the memory can be used. This is just >> a bug otherwise. > No, 128 byte redzone is an ABI thing both that OpenRISC and x86-64 have. > The bug in GCC was that redzone was not respected IIRC (if it's the > same bug that I have in mind). OK.
Would it possibly need to be respected at the beginning of the interrupt? And at the transfer via _ISR_Dispatch? >> R1 [SP] >> The stack pointer holds the limit of the current stack frame. The first 128 >> bytes below the stack pointer are reserved for leaf functions, and below >> that are undefined. Stack pointer must be word aligned at all times. >> Christian.. can you review that code? > Could you point me to the code? I don't know exactly which code and > version is being used. http://git.rtems.org/rtems/tree/cpukit/score/cpu/or1k/rtems/score/cpu.h around line 548. That is implemented using _OR1K_mtspr which is around line 336 of http://git.rtems.org/rtems/tree/cpukit/score/cpu/or1k/rtems/score/or1k-utility.h These asm constraints are always so hard to get right. -- Joel Sherrill, Ph.D. Director of Research & Development joel.sherr...@oarcorp.com On-Line Applications Research Ask me about RTEMS: a free RTOS Huntsville AL 35805 Support Available (256) 722-9985 _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
