sim: implement getdents/getdents64 in user mode

Has been tested only for alpha.
Committed by: Nilay Vaish <nilay@cs.wisc.edu>

1 files changed, 36 insertions, 0 deletions

diff --git a/src/sim/syscall_emul.cc b/src/sim/syscall_emul.cc
index d8df891dd..7eeacd319 100644
--- a/src/sim/syscall_emul.cc
+++ b/src/sim/syscall_emul.cc
@@ -31,6 +31,7 @@
 
 #include <fcntl.h>
 #include <unistd.h>
+#include <sys/syscall.h>
 
 #include <cstdio>
 #include <iostream>
@@ -868,6 +869,41 @@ cloneFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 }
 
 SyscallReturn
+getdentsFunc(SyscallDesc *desc, int num, LiveProcess *p,
+             ThreadContext *tc)
+{
+    int index = 0;
+    int fd = p->sim_fd(p->getSyscallArg(tc, index));
+    Addr bufPtr = p->getSyscallArg(tc, index);
+    int nbytes = p->getSyscallArg(tc, index);
+    BufferArg bufArg(bufPtr, nbytes);
+
+    int bytes_read = syscall(SYS_getdents, fd, bufArg.bufferPtr(), nbytes);
+
+    if (bytes_read != -1)
+        bufArg.copyOut(tc->getMemProxy());
+
+    return bytes_read;
+}
+
+SyscallReturn
+getdents64Func(SyscallDesc *desc, int num, LiveProcess *p,
+               ThreadContext *tc)
+{
+    int index = 0;
+    int fd = p->sim_fd(p->getSyscallArg(tc, index));
+    Addr bufPtr = p->getSyscallArg(tc, index);
+    int nbytes = p->getSyscallArg(tc, index);
+    BufferArg bufArg(bufPtr, nbytes);
+
+    int bytes_read = syscall(SYS_getdents64, fd, bufArg.bufferPtr(), nbytes);
+
+    if (bytes_read != -1)
+        bufArg.copyOut(tc->getMemProxy());
+
+    return bytes_read;
+}
+SyscallReturn
 accessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc,
         int index)
 {