2017-03-21 7:48 GMT+01:00 Nicolas Cellier <nicolas.cellier.aka.nice@gmail.com >:I could also have printed the jump_buf address in gdb, but it was too late yesterday ;)Hi Eliot,I'll try the assert if I can find a time slot today, otherwise this evening.2017-03-21 2:19 GMT+01:00 Eliot Miranda <eliot.miranda@gmail.com>:On Mon, Mar 20, 2017 at 6:01 PM, Eliot Miranda <eliot.miranda@gmail.com> wrote:Hi Nicolas,On Mon, Mar 20, 2017 at 5:56 PM, Eliot Miranda <eliot.miranda@gmail.com> wrote:Hi Nicolas,On Mon, Mar 20, 2017 at 3:45 PM, Nicolas Cellier <nicolas.cellier.aka.nice@gmail.com > wrote:See https://github.com/OpenSmalltaIt must be aligned on 16 bytes boundary in Win64, but sometimes the compiler fails to honour this requirementI now suspect the jmp_buf alignment problem that I had to workaround in jpeg plugin:Thanks Eliot for pushing WIN64 ABI further!So the failure is this one:
gdb: unknown target exception 0xc0000028 at 0x774c8078
Program received signal ?, Unknown signal.
0x00000000774c8078 in ntdll!RtlRaiseStatus () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
(gdb) where
#0 0x00000000774c8078 in ntdll!RtlRaiseStatus () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
#1 0x0000000077467eb6 in ntdll!TpAlpcRegisterCompletionList () from /cygdrive/c/Windows/SYSTEM32/n tdll.dll
#2 0x000007fefe08e5a3 in msvcrt!longjmp () from /cygdrive/c/Windows/system32/msvcrt.dll
#3 0x0000000000419502 in ceReturnToInterpreter (anOop=176164968) at ../../spur64src/vm/gcc3x-cointerp.c:16504
#4 0x000000000a801086 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)lk/opensmalltalk-vm/pull/120 Hmph. So the stack /should/ be aligned on a 16-byte boundary and hence the compiler /should/ be able to maintain the invariant (see platforms/Cross/vm/sqCogStackAlignment.h; in fact on Mac OS X the alignment is 32 bytes). Let me suggest that you add the following to the preamble:#if WIN64# define sigsetjmp(jb,ssmf) (assert(((int)jb & 15) == 0, setjmp(jb))# define siglongjmp(jb,v) (assert(((int)jb & 15) == 0, longjmp(jb,v))#elif WIN32...and make sure there's a self assertCStackWellAligned send in ceReturnToInterpreter.Hmmm. I expect we need code in the ceReturnToInterpreterTrampoline that establishes the stack alignment requirement. ceReturnToInterpreter: would be called from machine code where there is only 8 byte alignment on x64 (& 4 byte alignment on 32-bit VMs). If you like I can try and implement this tomorrow. Looking at the code, that's not necessary. The trampoline still switches to the C stack, which should be correctly aligned. So yes, definitely add the "self assertCStackWellAligned" to both ceReturnToInterpreter: and ceBaseFrameReturn:. It looks like the issue is whether the returnToInterpreter jmpbuf is correctly aligned.
The STACK_ALIGN_BYTES is 16 in good agreement with WIN64 ABI and assertCStackWellAligned() do succeed in ceReturnToInterpreter...
So, I added the assertion on setjmp and longjmp, but they do not fail.The jmp_buf reenterInterpreter is correctly aligned on 16 bytes boundary.There is a declaration like this in setjmp.h
typedef _CRT_ALIGN(16) struct _SETJMP_FLOAT128
So local and global jmp_buf variables are allways well aligned by the C compiler(s)The jpeg problem was caused by putting the jmp_buf into a structure.
Apparently, gcc and clang fail to correctly handle that case
(they should first align the whole struct on 16 bytes then align the offset of the jmp_buf member).There are other cases that will be problematic in Win64 exactly like the jpeg case, for example I see:
siglongjmp((vmCallbackContext->trampoline)... in returnAsThroughCallbackContext
longjmp(GIV(jmpBuf)[GIV(jmpDepth)]...in callbackLeave (only #if SQ_USE_GLOBAL_STRUCT) We should memcpy these to a local jmp_buf for WIN64 compatibility.But the VM failed before ever reaching one of these callbacks (we should have none in Squeak by default)So, wrong guess from my side for the moment, seeing longjmp on the call stack raised that false alarm.2017-03-19 21:03 GMT+01:00 Nicolas Cellier <nicolas.cellier.aka.nice@gmail.com >:And currently https://github.com/OpenSmalltaIt's necessary to hack the CogX64Compiler SysV class var initialization and generate a win64 specific cogitX64.c.lk/opensmalltalk-vm/blob/Cog/s is generated for SysV only.pur64src/vm/cogitX64.c 2017-03-19 20:34 GMT+01:00 Nicolas Cellier <nicolas.cellier.aka.nice@gmail.com >:Nicolas- the experiments I did resulted in VM crashing early (before opening window)- we have to assign the registers differently than sysV- win64 use it's own ABIHi Clement,it's been a while since I last tested, but in a few words:2017-03-19 20:29 GMT+01:00 Clément Bera <bera.clement@gmail.com>:Thank you very much for doing Nicolas. It is very important for many Pharo users to use Pharo 64 bits on Windows.What are the problems you have when trying to build the VM with the JIT that you don't have when building the stack VM ? Is it about API to make the memory executable, is it about calling conventions ?On Sun, Mar 19, 2017 at 12:14 PM, Nicolas Cellier <nicolas.cellier.aka.nice@gmail.com > wrote:2017-03-19 17:31 GMT+01:00 Nicolas Cellier <nicolas.cellier.aka.nice@gmail.com >:but I did not work on it for a few months...The 64bits squeak/pharo.cog.spur JIT for windows is still to come,If the appveyor job correctly succeed, I will emit a pull request.build_pharo_win32_with_cygwinand I'm uploading the changes to opensmalltalk-vm in branchHi,I've built a 64bits pharo.stack.spur VM for windows on my machine,
The VM does not have the SqueakSSL plugin yet.One thing at a time.Let's cross fingerNicolas--_,,,^..^,,,_best, Eliot--_,,,^..^,,,_best, Eliot--_,,,^..^,,,_best, Eliot