Re: Internal unwinding clobbers non-volatile registers.
- From: Mike Pall <mikelj-2105@xxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Mon, 31 May 2021 05:22:05 +0200
Can Boluk wrote:
I've noticed that internal unwinding [...]
As you can see this will clobber r13-r15 which are defined as callee saved
under MS ABI.
Precisely for this reason, external unwinding is mandatory on
Windows/x64. A previous version of lj_err.c had this text:
| EXT is mandatory on WIN64 since the calling convention has an abundance
| of callee-saved registers (rbx, rbp, rsi, rdi, r12-r15, xmm6-xmm15).
--Mike
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