[bug #60267] Possible method of resolving the Apple M-1 W^X issue

[John Cowan]

URL:
  <https://savannah.gnu.org/bugs/?60267>

                 Summary: Possible method of resolving the Apple M-1 W^X issue
                 Project: MIT/GNU Scheme
            Submitted by: johnwcowan
            Submitted on: Mon 22 Mar 2021 03:03:27 AM UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                Keywords: 

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Details:

Apple has posted a method
<https://developer.apple.com/documentation/apple-silicon/porting-just-in-time-compilers-to-apple-silicon>
for supporting JITs on Apple M-1 machines.  Basically one must allocate a
segment with mmap using the MAP_JIT option.  Then the function
pthread_jit_write_protect_np must be called with a boolean argument:  false
turns off write-protection and enables execution, and true turns turns on
write-protection and disables execution.

I hope this is helpful.




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