File qemu-cvs-futex.patch of Package qemu

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File qemu-cvs-futex.patch of Package qemu (Revision b2134ea0373af806abb469cc258dc5d7)

Currently displaying revision b2134ea0373af806abb469cc258dc5d7 , Show latest

Index: qemu.bkp/linux-user/syscall.c
================================================================================
--- qemu/linux-user/syscall.c
+++ qemu/linux-user/syscall.c
@@ -17,6 +17,8 @@
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
+
+#define __user
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdarg.h>
@@ -60,6 +62,7 @@
 #define tchars host_tchars /* same as target */
 #define ltchars host_ltchars /* same as target */
 
+#include <linux/futex.h>
 #include <linux/termios.h>
 #include <linux/unistd.h>
 #include <linux/utsname.h>
@@ -2715,6 +2718,92 @@
     unlock_user_struct(target_ts, target_addr, 1);
 }
 
+#ifdef BSWAP_NEEDED
+static int futex_op(int oldval, int op, int oparg)
+{
+	int retval = oparg;
+	switch(op) {
+	    case FUTEX_OP_SET: break;
+	    case FUTEX_OP_ADD: retval += oparg; break;
+	    case FUTEX_OP_OR: retval |= oparg; break;
+	    case FUTEX_OP_ANDN: retval &= oparg; break;
+	    case FUTEX_OP_XOR: retval ^= oparg; break;
+	}
+	return retval;
+}
+
+static int futex_cmp(int oldval, int cmp, int cmparg)
+{
+	switch(cmp) {
+	    case FUTEX_OP_CMP_EQ: return oldval == cmparg;
+	    case FUTEX_OP_CMP_NE: return oldval != cmparg;
+	    case FUTEX_OP_CMP_LT: return oldval <  cmparg;
+	    case FUTEX_OP_CMP_LE: return oldval <= cmparg;
+	    case FUTEX_OP_CMP_GT: return oldval >  cmparg;
+	    case FUTEX_OP_CMP_GE: return oldval >= cmparg;
+	}
+	return -1;
+}
+#endif
+
+static long do_futex(target_ulong uaddr, int op, uint32_t val,
+                    target_ulong utime, target_ulong uaddr2,
+                    uint32_t val3)
+{
+       struct timespec host_utime;
+       unsigned long val2 = utime;
+       long retval;
+
+       if (utime && (op == FUTEX_WAIT || op == FUTEX_LOCK_PI)) {
+               target_to_host_timespec(&host_utime, utime);
+               val2 = (unsigned long)&host_utime;
+       }
+ 
+#ifdef BSWAP_NEEDED
+       switch(op) {
+       case FUTEX_CMP_REQUEUE:
+               val3 = tswap32(val3);
+       case FUTEX_REQUEUE:
+               val2 = tswap32(val2);
+       case FUTEX_WAIT:
+       case FUTEX_WAKE:
+       case FUTEX_WAKE_OP:
+               val = tswap32(val);
+       case FUTEX_LOCK_PI: /* This one's icky, but comes out OK */
+       case FUTEX_UNLOCK_PI:
+               break;
+       default: 
+               gemu_log("qemu: Unsupported futex op %d\n", op);
+               return -TARGET_ENOSYS;
+       } 
+       if (op == FUTEX_WAKE_OP) {
+               /* Need to munge the secondary operation (val3) */
+	       gemu_log("qemu: Tricky FUTEX_WAKE_OP - trying to emulate it\n");
+               val3 = tswap32(val3);
+               int op2 = (val3 >> 28) & 0xf;
+               int cmp = (val3 >> 24) & 0xf;
+               int oparg = (val3 >> 12) & 0xfff;
+               int cmparg = val3 & 0xfff;
+               int shift = val3 & (FUTEX_OP_OPARG_SHIFT << 28);
+               int oldval; if(get_user_u32(oldval, uaddr2))
+ 			return -TARGET_EFAULT;
+               if (shift)
+                   oparg = 1 << oparg;
+
+              put_user_u32(uaddr2,futex_op(oldval, op2, oparg));
+              retval = syscall(__NR_futex, g2h(uaddr), FUTEX_WAKE, val, 0, 0, 0);
+              if(futex_cmp(oldval, cmp, cmparg)) {
+                  retval = syscall(__NR_futex, g2h(uaddr2), FUTEX_WAKE, val2, 0, 0, 0);
+              }
+       } else {
+              retval = syscall(__NR_futex, g2h(uaddr), op, val, val2, g2h(uaddr2), val3);
+       }
+#else
+       retval = syscall(__NR_futex, g2h(uaddr), op, val, val2, g2h(uaddr2), val3);
+#endif
+       return retval;
+}
+
 /* do_syscall() should always have a single exit point at the end so
    that actions, such as logging of syscall results, can be performed.
    All errnos that do_syscall() returns must be -TARGET_<errcode>. */
@@ -5116,6 +5205,11 @@
     }
 #endif
 
+#ifdef TARGET_NR_futex
+    case TARGET_NR_futex:
+        ret = get_errno(do_futex(arg1, arg2, arg3, arg4, arg5, arg6));
+        break;
+#endif
 #if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address)
     case TARGET_NR_set_tid_address:
       ret = get_errno(set_tid_address((int *) arg1));

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File qemu-cvs-futex.patch of Package qemu (Revision b2134ea0373af806abb469cc258dc5d7)

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