From: Doug Coleman <doug.coleman@gmail.com>
Date: Wed, 17 Mar 2021 03:54:09 +0000 (-0500)
Subject: arm: 128 byte red zone
X-Git-Url: https://gitweb.factorcode.org/gitweb.cgi?p=factor.git;a=commitdiff_plain;h=9a92e489c26e7a81660b4138ecd91596528629dd

arm: 128 byte red zone
---

diff --git a/basis/bootstrap/assembler/arm.64.factor b/basis/bootstrap/assembler/arm.64.factor
index 93e1352060..0b1ff56bfc 100644
--- a/basis/bootstrap/assembler/arm.64.factor
+++ b/basis/bootstrap/assembler/arm.64.factor
@@ -50,16 +50,18 @@ big-endian off
 ! X8         Indirect result location register
 ! X9 -  X15  Temporary registers
 ! X16 - X17  Intra-procedure call temporary
-! X18        Platform register, otherwise temporary
+! X18        Platform register, otherwise temporary, DONT USE
 
 ! X19 - X29    Callee-saved register    Must preserve
+! X29 - frame pointer register, must always be valid
 ! X30    Link Register    Can Corrupt
+! 16-byte stack alignment
 
 : arg1 ( -- reg ) X0 ;
 : arg2 ( -- reg ) X1 ;
 : arg3 ( -- reg ) X2 ;
 : arg4 ( -- reg ) X3 ;
-: red-zone-size ( -- n ) 16 ;
+: red-zone-size ( -- n ) 128 ;
 
 : shift-arg ( -- reg ) X1 ;
 : div-arg ( -- reg ) X0 ;