From: Mark Wooding <mdw@distorted.org.uk>
Date: Mon, 19 Oct 2020 04:34:05 +0000 (+0100)
Subject: Set and dump (almost) all of the ARM64 general registers.
X-Git-Url: https://git.distorted.org.uk/~mdw/xchg-rax-rax/commitdiff_plain/b5872e2dbb058db15e500695c67f497ca5001490

Set and dump (almost) all of the ARM64 general registers.

Omitting only: x18 (platform register), x30 (link register, needed for
procedure linkage), and x31 (stack pointer/zero register).
---

diff --git a/main.c b/main.c
index df4b941..b68e985 100644
--- a/main.c
+++ b/main.c
@@ -26,7 +26,9 @@ union reg {
 #elif defined(__aarch64__)
 #  define GPREGS(_)							\
 	_(x0) _(x1) _(x2) _(x3) _(x4) _(x5) _(x6) _(x7)			\
-	_(x8) _(x9) _(x10) _(x11) _(x12) _(x13) _(x14) _(x15)
+	_(x8) _(x9) _(x10) _(x11) _(x12) _(x13) _(x14) _(x15)		\
+	_(x16) _(x17) _(x19) _(x20) _(x21) _(x22) _(x23)		\
+	_(x24) _(x25) _(x26) _(x27) _(x28) _(x29)
 #else
 #  error "not supported"
 #endif
diff --git a/xchg.S b/xchg.S
index 8e0bf66..c99e0a6 100644
--- a/xchg.S
+++ b/xchg.S
@@ -387,11 +387,17 @@ proc	call_example
 	stp	x23, x24, [sp,  #48]
 	stp	x25, x26, [sp,  #64]
 	stp	x27, x28, [sp,  #80]
-	str	x1, [sp, #96]
-
-	mov	x16, x0
-
-	ldr	x17,	  [x1, #128]
+	str	      x1, [sp, #104]
+
+	ldp	x29, x30, [x1, #224]
+	msr	nzcv, x30
+	mov	x30, x0
+	ldp	x27, x28, [x1, #208]
+	ldp	x25, x26, [x1, #192]
+	ldp	x23, x24, [x1, #176]
+	ldp	x21, x22, [x1, #160]
+	ldp	x19, x20, [x1, #144]
+	ldp	x16, x17, [x1, #128]
 	ldp	x14, x15, [x1, #112]
 	ldp	x12, x13, [x1,  #96]
 	ldp	x10, x11, [x1,  #80]
@@ -400,21 +406,27 @@ proc	call_example
 	ldp	 x4,  x5, [x1,  #32]
 	ldp	 x2,  x3, [x1,  #16]
 	ldp	 x0,  x1, [x1,   #0]
-	msr	nzcv, x17
-
-	blr	x16
-
-	ldr	x16, [sp, #96]
-	mrs	x17, nzcv
-	str	x17,	  [x16, #128]
-	stp	x14, x15, [x16, #112]
-	stp	x12, x13, [x16,  #96]
-	stp	x10, x11, [x16,  #80]
-	stp	 x8,  x9, [x16,  #64]
-	stp	 x6,  x7, [x16,  #48]
-	stp	 x4,  x5, [x16,  #32]
-	stp	 x2,  x3, [x16,  #16]
-	stp	 x0,  x1, [x16,   #0]
+
+	blr	x30
+
+	ldr	x30, [sp, #104]
+	stp	x27, x28, [x30, #208]
+	stp	x25, x26, [x30, #192]
+	stp	x23, x24, [x30, #176]
+	stp	x21, x22, [x30, #160]
+	stp	x19, x20, [x30, #144]
+	stp	x16, x17, [x30, #128]
+	stp	x14, x15, [x30, #112]
+	stp	x12, x13, [x30,  #96]
+	stp	x10, x11, [x30,  #80]
+	stp	 x8,  x9, [x30,  #64]
+	stp	 x6,  x7, [x30,  #48]
+	stp	 x4,  x5, [x30,  #32]
+	stp	 x2,  x3, [x30,  #16]
+	stp	 x0,  x1, [x30,   #0]
+	mov	x0, x30
+	mrs	x30, nzcv
+	stp	x29, x30,  [x0, #224]
 
 	ldp	x19, x20, [sp,  #16]
 	ldp	x21, x22, [sp,  #32]