rp2040

commit 462ecf4d7dae62b165ea69ec90df8ceaf6f95568
parent b6befe55d289bcee8a73e339af2e0a4093de7aee
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Sat, 24 Feb 2024 12:08:13 +0900

add svcall handler

Diffstat:
M
ex3/main.s
 | 
53
+++++++++++++++++++++++++++++++----------------------

1 file changed, 31 insertions(+), 22 deletions(-)
diff --git a/ex3/main.s b/ex3/main.s
@@ -105,37 +105,46 @@ wait_vco:
 	lsl r0, #14
 	str r0, [r3, #0] // SYSCFG: PROC0_NMI_MASK
 
-	bl int_systick
-
-	ldr r4, ppb_base
-	ldr r5, =0xe018
+	ldr r1, =0x20000000
+	mov r0, #0
+	str r0, [r1, #0]
 loop:
-	ldr r0, ='\r'
-	bl putbyte
-	ldr r0, [r4, r5] // M0PLUS: SYST_CVR
-	bl printh
-	ldr r0, ='\n'
-	bl putbyte
-	ldr r0, ='\r'
-	bl putbyte
-	mov r0, sp
-	bl printh
-	ldr r0, ='\n'
-	bl putbyte
 	wfi
+	svc #0
 	b loop
 
 // functions
 
+int_svcall:
+	push {lr}
+	mov r0, #'\r'
+	bl putbyte
+	mov r0, #'s'
+	bl putbyte
+	mov r0, #'v'
+	bl putbyte
+	mov r0, #'c'
+	bl putbyte
+	mov r0, #'a'
+	bl putbyte
+	mov r0, #'l'
+	bl putbyte
+	mov r0, #'l'
+	bl putbyte
+	mov r0, #'\n'
+	bl putbyte
+	pop {pc}
+
 int_systick:
 	push {lr}
-	ldr r0, ='\r'
+	mov r0, #'\r'
 	bl putbyte
-	ldr r3, ppb_base
-	ldr r1, =0xe010
-	ldr r0, [r3, r1] // SYSCFG: PROC0_NMI_MASK
+	ldr r1, =0x20000000
+	ldr r0, [r1, #0]
+	add r0, #1
+	str r0, [r1, #0]
 	bl printh
-	ldr r0, ='\n'
+	mov r0, #'\n'
 	bl putbyte
 	pop {pc}
 
@@ -285,7 +294,7 @@ vectors:
 	.word (reset+1)  // 8
 	.word (reset+1)  // 9
 	.word (reset+1)  // 10
-	.word (reset+1)  // 11
+	.word (int_svcall+1)  // 11 svcall
 	.word (reset+1)  // 12
 	.word (reset+1)  // 13
 	.word (reset+1)  // 14