Use 0 instead of syscall_invalid in syscall jump list

2019-05-18 18:11:08 -07:00
parent ce035d2a43
commit a653c55941
2 changed files with 8 additions and 5 deletions
--- a/src/kernel/syscall.s
+++ b/src/kernel/syscall.s
@@ -34,12 +34,16 @@ syscall_handler_prelude:
 	cmp rax, MAX_SYSCALLS
 	jle .ok_syscall

+.bad_syscall:
 	mov rdi, rax
 	call syscall_invalid

 .ok_syscall:
 	lea r11, [rel syscall_registry]
 	mov r11, [r11 + rax * 8]
+	cmp r11, 0
+	je .bad_syscall
+
 	call r11

 	inc qword [rel __counter_syscall_sysret]