<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">I wonder if you need to <u>turn off</u> Windows 10’s new-ish, nondeterministic memory allocation policy. We have run into this with other Lisps. I don’t remember the correct terminology for this malware countermeasure or the name of the configuration flag. Sorry. Can someone else chime in?<br><br><div dir="ltr">--Tim</div><div dir="ltr"><br><blockquote type="cite">On Dec 29, 2022, at 13:49, Bharat Shetty <bshetty@gmail.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">Hi,<div><br></div><div>I built ccl (downloaded the 1.12.1 zip file from github)on </div><div><ul><li>Windows 10 (cygwin)</li><li>gcc version 11.3.0 </li><li>ld/binutils version 2.39</li><li>debug flag changed to -g3 in Makefile</li><li>code optimisation level set to -O0 (zero) also in Makefile</li></ul></div><div><br></div><div>When the exe was built i got a message that section /1, /8 and /32 are before text. I altered the pei-x86-64.x to include the new debug sections(upto dwarf 5). For this i generated the default script running ld --verbose. retained .Copied .spfoo from the original, removed KEEP() and most of the SORT() unless it was present in the original file. Besides this I had to add <i><b>-no-pie and -Wl,--allow-multiple-definition</b></i> to the build rule for wx86cl64.exe target. I have not made any changes to the source code. This got an exe that starts. </div><div><br></div><div>However every time I run this, it crashes at calculate_relocation in x86-gc.c. The back trace is as follows:</div><div>#0 0x0000000000031d56 in calculate_relocation () at ../x86-gc.c:1571<br>#1 0x000000000002ea15 in gc (tcr=0x5acebc0, param=0) at ../gc-common.c:1821<br>#2 0x000000000003a170 in gc_from_tcr (tcr=0x5acebc0, param=0) at ../x86-exceptions.c:3014<br>#3 0x000000000003a06b in gc_like_from_xp (xp=0x25f6f570, fun=0x3a126 <gc_from_tcr>, param=0) at ../x86-exceptions.c:2970<br>#4 0x000000000003a1ce in gc_from_xp (xp=0x25f6f570, param=0) at ../x86-exceptions.c:3026<br>#5 0x0000000000035c0f in allocate_object (xp=0x25f6f570, bytes_needed=16, disp_from_allocptr=13, tcr=0x5acebc0, crossed_threshold=0x25f6f1ec) at ../x86-exceptions.c:171<br>#6 0x0000000000036f26 in handle_alloc_trap (xp=0x25f6f570, tcr=0x5acebc0, notify=0x25f6f1ec) at ../x86-exceptions.c:665<br>#7 0x0000000000037f15 in handle_exception (signum=11, info=0x25f6f4d8, context=0x25f6f570, tcr=0x5acebc0, old_valence=0) at ../x86-exceptions.c:1215<br>#8 0x0000000000038cf3 in windows_exception_handler (exception_pointers=0x25f6f4c0, tcr=0x5acebc0, signal_number=11) at ../x86-exceptions.c:2150<br>#9 0x00000000000438dd in windows_switch_to_foreign_stack () at ../x86-asmutils64.s:263<br>#10 0x0000000025f6f4c0 in ?? ()<br></div><div><br></div><div>This happens after start_lisp is called. By the time the code reaches gc.c global_reloctab is reset (set to 0x7cfe000000 before entering start_lisp). Due to this GCrelocptr is also set to 0x0 in gc-common.c. This results in relocptr being set to 0x0 in calculate_relocation. Also GCndynamic_dnodes_in_area is also 0 at this point(in the downloaded version it is 2048 at this point). </div><div><br></div><div>Does anyone know why these global variables are reset ? And how can I fix this? I suspect this is because of the newer versions of gcc and ld.</div><div><br></div><div>Regards,</div><div>Bharat</div></div>
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