Syscalls access all registerssyscall

2 files changed, 11 insertions, 5 deletions

diff --git a/interrupts-asm.s b/interrupts-asm.s
index bde4032..3e8b119 100644
--- a/interrupts-asm.s
+++ b/interrupts-asm.s
@@ -28,10 +28,14 @@ asm_undef_insn:
 	mov sp, #INT_STACK_ADDR
 	ldr pc, _vec_undef_insn
 asm_software_irq:
-	push {r1-r12,r14}
+	mov sp, #INT_STACK_ADDR
+	sub lr, lr, #4
+	push {lr}
+	stmfd sp, {r0-r14}^
+	sub sp, sp, #60
+	mov r0, sp
 	bl syscall
-	pop {r1-r12,r14}
-	movs pc, lr
+	ldm sp, {r0-r15}^
 asm_prefetch_abort:
 	mov sp, #INT_STACK_ADDR
 	ldr pc, _vec_prefetch_abort
diff --git a/syscall.c b/syscall.c
index 0404718..af96363 100644
--- a/syscall.c
+++ b/syscall.c
@@ -1,10 +1,12 @@
 #include "pios.h"
 #include "syscall.h"
 
-void syscall(unsigned sysno) {
+void syscall(user_regs_t* regs) {
+    unsigned sysno = regs->r0;
     switch (sysno) {
     case SYSCALL_EXIT:
-        panic("exit unimplemented\n");
+        printf("Exiting\n");
+        reboot();
         break;
     default:
         panic("unhandled syscall %d\n", sysno);