polmon: bp in clobber list works not

2025-09-25 11:53:47 +02:00
parent 59def426da
commit 2120df695e
1 changed files with 3 additions and 1 deletions
--- a/polmon.cc
+++ b/polmon.cc
@@ -54,12 +54,14 @@ uint8_t getc() {

 void putc(uint8_t c) {
    asm volatile (
+            "push %%bp          \n\t"
            "movb %0, %%al      \n\t"
            "movb $0x0e, %%ah   \n\t"
            "movb $0, %%bh      \n\t"
            "int $0x10          \n\t"
+            "pop %%bp           \n\t"
            :: "r" (c)
-            : "ax", "bh", "cc", "bp"
+            : "ax", "bh", "cc"
            );
 }