From 499784a824c541001c2fd52ae95eba88dcfc952b Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Sat, 21 Dec 2019 22:22:03 +0100
Subject: Many debugging/serial improvements

Sorry for the little information, but I did many things :)
---
 src/userspace/syscall.h | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

(limited to 'src/userspace/syscall.h')

diff --git a/src/userspace/syscall.h b/src/userspace/syscall.h
index 8dd647f..60fb288 100644
--- a/src/userspace/syscall.h
+++ b/src/userspace/syscall.h
@@ -18,25 +18,25 @@
 
 #define DEFN_SYSCALL1(fn, num, P1) \
     int syscall_##fn(P1 p1) { \
-        int __res; __asm__ __volatile__("int $0x80" \
+        int __res; __asm__ __volatile__("push %%ebx; movl %2,%%ebx; int $0x80; pop %%ebx" \
                 : "=a" (__res) \
-                : "0" (num), "b" ((int)(p1)) \
+                : "0" (num), "r" ((int)(p1)) \
                 : "memory"); \
         return __res; \
     }
 
 #define DEFN_SYSCALL2(fn, num, P1, P2) \
     int syscall_##fn(P1 p1, P2 p2) { \
-        int __res; __asm__ __volatile__("int $0x80" \
+        int __res; __asm__ __volatile__("push %%ebx; movl %2,%%ebx; int $0x80; pop %%ebx" \
                 : "=a" (__res) \
-                : "0" (num), "b" ((int)(p1)), "c"((int)(p2)) \
+                : "0" (num), "r" ((int)(p1)), "c"((int)(p2)) \
                 : "memory"); \
         return __res; \
     }
 
 #define DEFN_SYSCALL3(fn, num, P1, P2, P3) \
     int syscall_##fn(P1 p1, P2 p2, P3 p3) { \
-        int __res; __asm__ __volatile__("int $0x80" \
+        int __res; __asm__ __volatile__("push %%ebx; movl %2,%%ebx; int $0x80; pop %%ebx" \
                 : "=a" (__res) \
                 : "0" (num), "b" ((int)(p1)), "c"((p2)), "d"((int)(p3)) \
                 : "memory"); \
@@ -45,7 +45,7 @@
 
 #define DEFN_SYSCALL4(fn, num, P1, P2, P3, P4) \
     int syscall_##fn(P1 p1, P2 p2, P3 p3, P4 p4) { \
-        int __res; __asm__ __volatile__("int $0x80" \
+        int __res; __asm__ __volatile__("push %%ebx; movl %2,%%ebx; int $0x80; pop %%ebx" \
                 : "=a" (__res) \
                 : "0" (num), "b" ((int)(p1)), "c"((int)(p2)), "d"((int)(p3)), "S"((int)(p4)) \
                 : "memory"); \
@@ -54,7 +54,7 @@
 
 #define DEFN_SYSCALL5(fn, num, P1, P2, P3, P4, P5) \
     int syscall_##fn(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) { \
-        int __res; __asm__ __volatile__("int $0x80" \
+        int __res; __asm__ __volatile__("push %%ebx; movl %2,%%ebx; int $0x80; pop %%ebx" \
                 : "=a" (__res) \
                 : "0" (num), "b" ((int)(p1)), "c"((int)(p2)), "d"((int)(p3)), "S"((int)(p4)), "D"((int)(p5)) \
                 : "memory"); \
-- 
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