From: kub <derkub@gmail.com>
Date: Sun, 21 Mar 2021 21:47:56 +0000 (+0100)
Subject: sh2 drc, don't use x29 (frame pointer) in arm64 backend
X-Git-Tag: v2.00~581
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=28f83122ece65df4b6fe884474d07135a7068fb2;p=picodrive.git

sh2 drc, don't use x29 (frame pointer) in arm64 backend
---

diff --git a/cpu/drc/emit_arm64.c b/cpu/drc/emit_arm64.c
index f9a316fe..66452975 100644
--- a/cpu/drc/emit_arm64.c
+++ b/cpu/drc/emit_arm64.c
@@ -7,14 +7,14 @@
  */
 #define HOST_REGS	32
 
-// AAPCS64: params: r0-r7, return: r0-r1, temp: r8-r17, saved: r19-r29
-// reserved: r18 (for platform use)
+// AAPCS64: params: r0-r7, return: r0-r1, temp: r8-r17, saved: r19-r28
+// reserved: r18 (for platform use), r29 (frame pointer)
 #define RET_REG		0
 #define PARAM_REGS	{ 0, 1, 2, 3, 4, 5, 6, 7 }
-#define PRESERVED_REGS	{ 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 }
+#define PRESERVED_REGS	{ 19, 20, 21, 22, 23, 24, 25, 26, 27, 28 }
 #define TEMPORARY_REGS	{ 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 }
 
-#define CONTEXT_REG	29
+#define CONTEXT_REG	19
 #define STATIC_SH2_REGS	{ SHR_SR,28 , SHR_R(0),27 , SHR_R(1),26 }
 
 // R31 doesn't exist, it aliases either with zero or SP