> compile NEMU

221220000 张三
Linux zzy 5.15.146.1-microsoft-standard-WSL2 #1 SMP Thu Jan 11 04:09:03 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
 21:56:50 up 6 days, 17:02,  1 user,  load average: 1.32, 1.45, 1.16

nanos-lite/src/syscall.c

@@ -1,5 +1,20 @@
 #include <common.h>
 #include "syscall.h"
+
+size_t _write(int fd, const void *buf, size_t count) {
+  if ((fd != 1 && fd != 2) || buf == NULL || count == 0) {
+    return -1;
+  }
+  for (size_t i = 0; i < count; i++) {
+    putch(((const char*)buf)[i]);
+  }
+  return count;
+}
+
+void _sbrk(intptr_t increment) {
+  
+}
+
 void do_syscall(Context *c) {
   uintptr_t a[4];
   a[0] = c->GPR1;
@@ -10,6 +25,7 @@ void do_syscall(Context *c) {
   TRACE("syscall %d: %s", a[0], __syscall_names[a[0]]);
   switch (a[0]) {
     case SYS_yield: yield(); break;
+    case SYS_write: c->GPRx = _write(a[1], (void*)a[2], a[3]); break;
     case SYS_exit: halt(0);  break;
     default: panic("Unhandled syscall ID = %d", a[0]);
   }

navy-apps/libs/libos/src/syscall.c

@@ -4,6 +4,7 @@
 #include <assert.h>
 #include <time.h>
 #include "syscall.h"
+#include <stdint.h>
 
 // helper macros
 #define _concat(x, y) x ## y
@@ -66,7 +67,7 @@ int _open(const char *path, int flags, mode_t mode) {
 }
 
 int _write(int fd, void *buf, size_t count) {
-  _exit(SYS_write);
+  _syscall_(SYS_write, fd, buf, count);
   return 0;
 }