SYSCALL naked assembly working

[cortex-from-scratch] / start.asm

diff --git a/start.asm b/start.asm
index f2c16bc..e6d08c6 100644 (file)
--- a/start.asm
+++ b/start.asm
@@ -13,6 +13,7 @@
        .text
        .global _start
        .global reset, nmi, hardfault
+       .global _svc_handler
        .code 16
        .syntax unified
 _start:
@@ -28,14 +29,17 @@ reset:
 /* These are consequently the nmi and hardfault vector handlers
    before booting and entering main, these can actually be called
    (machine somehow has a failure). That's why they are included here.
-   Later the interrupt vector
-   will be relocated to SRAM and the will be copied / modified.  */
+   Later the interrupt vector will be relocated to SRAM and modified.  */
 
 nmi:
        b nmi
 
-hardfault: 
-       b hardfault
-       
+hardfault:
+       mov r5, 9
+       b hardfault2
+
+hardfault2:
+       b hardfault2
+
        .end