# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1511047160 -3600
# Node ID 2bc674143b083a0ae234ab562f2e9d41bd837200
# Parent  6272f9be2733daaf034527f8e36a008754641096
Save and restore $gp so that the text blitting functions do not cause crashes.

diff -r 6272f9be2733 -r 2bc674143b08 vga.S
--- a/vga.S	Sat Nov 18 22:38:46 2017 +0100
+++ b/vga.S	Sun Nov 19 00:19:20 2017 +0100
@@ -71,6 +71,7 @@
 	lw $t8, -28($k0)
 	lw $ra, -32($k0)
 	lw $sp, -36($k0)
+	lw $gp, -40($k0)
 .endm
 
 .macro load_state
@@ -78,6 +79,7 @@
 	lw $s1, -48($k0)
 	lw $s2, -52($k0)
 	lw $s3, -56($k0)
+	lw $gp, -60($k0)
 .endm
 
 .macro save_affected
@@ -90,6 +92,7 @@
 	sw $t8, -28($k0)
 	sw $ra, -32($k0)
 	sw $sp, -36($k0)
+	sw $gp, -40($k0)
 .endm
 
 .macro save_state
@@ -97,6 +100,7 @@
 	sw $s1, -48($k0)
 	sw $s2, -52($k0)
 	sw $s3, -56($k0)
+	sw $gp, -60($k0)
 .endm
 
 _start:
diff -r 6272f9be2733 -r 2bc674143b08 vga.h
--- a/vga.h	Sat Nov 18 22:38:46 2017 +0100
+++ b/vga.h	Sun Nov 19 00:19:20 2017 +0100
@@ -22,6 +22,6 @@
 #define SCREEN_LIMIT_KSEG0	(KSEG0_BASE + SCREEN_LIMIT)
 
 #define IRQ_STACK_LIMIT		SCREEN_BASE_KSEG0
-#define IRQ_STACK_TOP		(IRQ_STACK_LIMIT - 56)
+#define IRQ_STACK_TOP		(IRQ_STACK_LIMIT - 64)
 
 #endif /* __VGA_H__ */