kernel: user safe strlen

2026-11-01 15:08:21 +00:00 · 2022-12-13 23:41:40 -03:00
parent 9fc62579ea
commit c17a2f4c6c
5 changed files with 55 additions and 1 deletions
@@ -0,0 +1,19 @@
+section .text:
+
+global arch_u_strlen
+global arch_u_strlen_cont
+
+arch_u_strlen:
+    xor rcx, rcx
+   .loop:
+        cmp byte [rdi],0
+        je .done
+        inc rcx
+        inc rdi
+    .done:
+    mov [rsi], rcx
+    xor rax, rax
+    ret
+arch_u_strlen_cont:
+    mov rax, 1
+    ret