Hi Tim, Hi Ken,

I think I have fixed the intermittent crash issue with Cog Spur on ARMv8. The issue was that the generated cache flush code flushed the open interval (start address, end address), not the open/closed interval (start address,end address], and so if the code zone was followed by an empty page a flush of all of the code zone would flush teh address just past the code zone and cause a segmentation violation. I can't test this properly; I have poor wifi access at the moment and can't reconnect my Raspberry Pi to wifi and so can't test. If you could build and test that would be fantastic. Thanks in advance if you're able to.

On Thu, Aug 12, 2021 at 11:22 AM Eliot Miranda noreply@github.com wrote:

Branch: refs/heads/Cog Home: https://github.com/OpenSmalltalk/opensmalltalk-vm Commit: c6c18805f2a5ba03b5ea3e765bb7fec1a2fce248

https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/c6c18805f2a5ba03b5e... Author: Eliot Miranda eliot.miranda@gmail.com Date: 2021-08-12 (Thu, 12 Aug 2021)

Changed paths: M nsspur64src/vm/cogit.h M nsspur64src/vm/cogitARMv8.c M nsspur64src/vm/cogitX64SysV.c M nsspur64src/vm/cogitX64WIN64.c M nsspur64src/vm/cointerp.c M nsspur64src/vm/cointerp.h M nsspur64src/vm/gcc3x-cointerp.c M spur64src/vm/cogit.h M spur64src/vm/cogitARMv8.c M spurlowcode64src/vm/cogit.h M spurlowcode64src/vm/cogitARMv8.c M spursista64src/vm/cogit.h M spursista64src/vm/cogitARMv8.c

Log Message:

CogVM source as per VMMaker.oscog-eem.3034

CogARMv8Compiler: Make sure the generated cache flush code flushes the range (startAddress to endAddress], i.e. never flush endAddress, only addresses less than endAddress. Flushing endAddress can cause a segmentation violation if the endAddress is on an empty page.