From 699cc8684b1571d2501bac2c8bdf461127a420a1 Mon Sep 17 00:00:00 2001
From: Eugen Wissner <belka@caraus.de>
Date: Sun, 6 Oct 2024 18:07:57 +0200
Subject: Implement division

---
 tools/builtin.s | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

(limited to 'tools/builtin.s')

diff --git a/tools/builtin.s b/tools/builtin.s
index 0f5f82c..d7f214d 100644
--- a/tools/builtin.s
+++ b/tools/builtin.s
@@ -7,6 +7,9 @@
 .global exit
 .type exit, @function
 
+.global _divide_by_zero_error
+.type _divide_by_zero_error, @function
+
 .global _start
 .type _start, @function
 
@@ -51,7 +54,7 @@ printi:
     addi a0, zero, 1
     addi a1, a1, 1
     sub a2, s0, a1
-    addi a7, zero, 64
+    addi a7, zero, 64 # write
     ecall
 
     lw s0, 0(sp)
@@ -74,7 +77,7 @@ printc:
     addi a0, zero, 1
     addi a1, s0, -2
     addi a2, zero, 2
-    addi a7, zero, 64
+    addi a7, zero, 64 # write
     ecall
 
     lw s0, 0(sp)
@@ -84,10 +87,19 @@ printc:
 
 exit:
     addi a0, zero, 0
-    addi a7, zero, 93
+    addi a7, zero, 93 # exit
     ecall
     # ret
 
+_divide_by_zero_error:
+    addi a7, zero, 172 # getpid
+    ecall
+
+    addi a1, zero, 8 # SIGFPE
+    addi a7, zero, 129 # kill
+    ecall
+    ret
+
 _start:
     call main
     call exit
-- 
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