update program

Author: outercloudstudio

programs/hello.c

@@ -1,22 +1,21 @@
 __attribute__((naked)) void _start(void) {
-    __asm__ volatile (
-        "li sp, 0x8000\n"   // top of 32KB RAM
+    __asm__ volatile(
+        "li sp, 0x8000\n"  // top of 32KB RAM
         "call main\n"
-        "loop: j loop\n"
-    );
+        "loop: j loop\n");
 }
 
 int main() {
-    volatile unsigned char* mem = (volatile unsigned char*)0x4000;
+    volatile unsigned char* mem = (volatile unsigned char*)0x0;
     int counter = 0;
 
     while (1) {
         counter++;
-        mem[counter] = counter;  // sb x1, 0(x2) — store counter byte
+        mem[0x4000 * counter] = counter;
 
         // busy-wait pause loop (~2000 iterations)
-        for (int i = 0; i < 2000; i++) {
-            __asm__("nop");  // prevent compiler from optimizing away
-        }
+        // for (int i = 0; i < 2000; i++) {
+        //     __asm__("nop");  // prevent compiler from optimizing away
+        // }
     }
 }

programs/hello.hex

@@ -6,25 +6,17 @@ fe010113
 00112e23
 00812c23
 02010413
-000047b7
-fef42223
+fe042423
 fe042623
 fec42783
 00178793
 fef42623
 fec42783
-fe442703
-00f707b3
+00e79793
+00078713
+fe842783
+00e787b3
 fec42703
 0ff77713
 00e78023
-fe042423
-0140006f
-00000013
-fe842783
-00178793
-fef42423
-fe842703
-7cf00793
-fee7d4e3
-fb9ff06f
+fd5ff06f

programs/hello.s

@@ -5,42 +5,42 @@
 	.attribute stack_align, 16
 	.text
 	.align	2
+	.globl	_start
+	.type	_start, @function
+_start:
+ #APP
+# 2 "./programs/hello.c" 1
+	li sp, 0x8000
+call main
+loop: j loop
+
+# 0 "" 2
+ #NO_APP
+	nop
+	.size	_start, .-_start
+	.align	2
 	.globl	main
 	.type	main, @function
 main:
 	addi	sp,sp,-32
 	sw	ra,28(sp)
 	sw	s0,24(sp)
 	addi	s0,sp,32
-	li	a5,16384
-	sw	a5,-28(s0)
+	sw	zero,-24(s0)
 	sw	zero,-20(s0)
-.L4:
+.L3:
 	lw	a5,-20(s0)
 	addi	a5,a5,1
 	sw	a5,-20(s0)
 	lw	a5,-20(s0)
-	lw	a4,-28(s0)
-	add	a5,a4,a5
+	slli	a5,a5,14
+	mv	a4,a5
+	lw	a5,-24(s0)
+	add	a5,a5,a4
 	lw	a4,-20(s0)
 	andi	a4,a4,0xff
 	sb	a4,0(a5)
-	sw	zero,-24(s0)
-	j	.L2
-.L3:
- #APP
-# 11 "./programs/hello.c" 1
-	nop
-# 0 "" 2
- #NO_APP
-	lw	a5,-24(s0)
-	addi	a5,a5,1
-	sw	a5,-24(s0)
-.L2:
-	lw	a4,-24(s0)
-	li	a5,1999
-	ble	a4,a5,.L3
-	j	.L4
+	j	.L3
 	.size	main, .-main
 	.ident	"GCC: (xPack GNU RISC-V Embedded GCC x86_64) 15.2.0"
 	.section	.note.GNU-stack,"",@progbits