From 53d2c9398e8c1631ae3fd5469b187b006d317f88 Mon Sep 17 00:00:00 2001
From: Ali Saidi <saidi@eecs.umich.edu>
Date: Sat, 18 Feb 2006 23:44:22 -0500
Subject: Move Linux/Tru64 architecture independent code into kern/* leaving
 dependent code making way  for solaris linux syscall emu.

SConscript:
    Add two new files for syscall emulation
    Add getDesc() function
arch/alpha/alpha_linux_process.cc:
arch/alpha/alpha_tru64_process.cc:
    move architecture independent code into kern/linux/linux.(hh|cc)
arch/alpha/alpha_linux_process.hh:
arch/alpha/alpha_tru64_process.hh:
    Add getDesc function
kern/linux/linux.hh:
    move generi linux syscall emulation code into kern/linux
kern/tru64/tru64.hh:
    move generi tru64 syscall emulation code into kern/tru64
sim/process.cc:
sim/process.hh:
    Push the function determination and calling stuff down to LiveProcess
    and out of the Linux/Tru64 classes respectively
sim/syscall_emul.cc:
sim/syscall_emul.hh:
    fnctl implementation was identical in tru64 and linux so moved to generic

--HG--
extra : convert_revision : 103293dbe6fe2f7892de4929d17dc085def77026
---
 sim/process.cc      | 15 +++++++++++++++
 sim/process.hh      |  6 ++++++
 sim/syscall_emul.cc | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 sim/syscall_emul.hh |  4 ++++
 4 files changed, 71 insertions(+)

(limited to 'sim')

diff --git a/sim/process.cc b/sim/process.cc
index 59d122b48..3ae3abb52 100644
--- a/sim/process.cc
+++ b/sim/process.cc
@@ -46,6 +46,7 @@
 #include "sim/fake_syscall.hh"
 #include "sim/process.hh"
 #include "sim/stats.hh"
+#include "sim/syscall_emul.hh"
 
 #ifdef TARGET_ALPHA
 #include "arch/alpha/alpha_tru64_process.hh"
@@ -350,6 +351,19 @@ LiveProcess::LiveProcess(const string &nm, ObjectFile *objFile,
     init_regs->npc = prog_entry + sizeof(MachInst);
 }
 
+void
+LiveProcess::syscall(ExecContext *xc)
+{
+    num_syscalls++;
+
+    int64_t callnum = xc->regs.intRegFile[ReturnValueReg];
+
+    SyscallDesc *desc = getDesc(callnum);
+    if (desc == NULL)
+        fatal("Syscall %d out of range", callnum);
+
+    desc->doSyscall(callnum, this, xc);
+}
 
 LiveProcess *
 LiveProcess::create(const string &nm,
@@ -394,6 +408,7 @@ LiveProcess::create(const string &nm,
 }
 
 
+
 BEGIN_DECLARE_SIM_OBJECT_PARAMS(LiveProcess)
 
     VectorParam<string> cmd;
diff --git a/sim/process.hh b/sim/process.hh
index 43fafd9d7..40143ea04 100644
--- a/sim/process.hh
+++ b/sim/process.hh
@@ -48,6 +48,7 @@
 
 class ExecContext;
 class FunctionalMemory;
+class SyscallDesc;
 class Process : public SimObject
 {
   public:
@@ -200,6 +201,11 @@ class LiveProcess : public Process
                                std::string executable,
                                std::vector<std::string> &argv,
                                std::vector<std::string> &envp);
+
+    virtual void syscall(ExecContext *xc);
+
+    virtual SyscallDesc* getDesc(int callnum) { panic("Must be implemented."); }
+
 };
 
 
diff --git a/sim/syscall_emul.cc b/sim/syscall_emul.cc
index 4b6388a41..a46e991b9 100644
--- a/sim/syscall_emul.cc
+++ b/sim/syscall_emul.cc
@@ -26,6 +26,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <fcntl.h>
 #include <unistd.h>
 
 #include <string>
@@ -278,3 +279,48 @@ fchownFunc(SyscallDesc *desc, int num, Process *process, ExecContext *xc)
     int result = fchown(fd, hostOwner, hostGroup);
     return (result == -1) ? -errno : result;
 }
+
+
+SyscallReturn
+fcntlFunc(SyscallDesc *desc, int num, Process *process,
+          ExecContext *xc)
+{
+    int fd = xc->getSyscallArg(0);
+
+    if (fd < 0 || process->sim_fd(fd) < 0)
+        return -EBADF;
+
+    int cmd = xc->getSyscallArg(1);
+    switch (cmd) {
+      case 0: // F_DUPFD
+        // if we really wanted to support this, we'd need to do it
+        // in the target fd space.
+        warn("fcntl(%d, F_DUPFD) not supported, error returned\n", fd);
+        return -EMFILE;
+
+      case 1: // F_GETFD (get close-on-exec flag)
+      case 2: // F_SETFD (set close-on-exec flag)
+        return 0;
+
+      case 3: // F_GETFL (get file flags)
+      case 4: // F_SETFL (set file flags)
+        // not sure if this is totally valid, but we'll pass it through
+        // to the underlying OS
+        warn("fcntl(%d, %d) passed through to host\n", fd, cmd);
+        return fcntl(process->sim_fd(fd), cmd);
+        // return 0;
+
+      case 7: // F_GETLK  (get lock)
+      case 8: // F_SETLK  (set lock)
+      case 9: // F_SETLKW (set lock and wait)
+        // don't mess with file locking... just act like it's OK
+        warn("File lock call (fcntl(%d, %d)) ignored.\n", fd, cmd);
+        return 0;
+
+      default:
+        warn("Unknown fcntl command %d\n", cmd);
+        return 0;
+    }
+}
+
+
diff --git a/sim/syscall_emul.hh b/sim/syscall_emul.hh
index d8029ddb0..fd5c7b6e6 100644
--- a/sim/syscall_emul.hh
+++ b/sim/syscall_emul.hh
@@ -239,6 +239,10 @@ SyscallReturn chownFunc(SyscallDesc *desc, int num,
 SyscallReturn fchownFunc(SyscallDesc *desc, int num,
                          Process *p, ExecContext *xc);
 
+/// Target fnctl() handler.
+SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
+                        Process *process, ExecContext *xc);
+
 /// This struct is used to build an target-OS-dependent table that
 /// maps the target's open() flags to the host open() flags.
 struct OpenFlagTransTable {
-- 
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