sim: syscall: add common sim_syscall helpers

Many ports have the same sim syscall logic, so add some helpers to handle
all the common details.  The arches still have to deal with the unpacking
and packing of the syscall arguments, but the rest of the sim<->callback
glue is now shared.

1 files changed, 8 insertions, 56 deletions

diff --git a/sim/msp430/msp430-sim.c b/sim/msp430/msp430-sim.c
index 650584a..931573e 100644
--- a/sim/msp430/msp430-sim.c
+++ b/sim/msp430/msp430-sim.c
@@ -1022,62 +1022,14 @@ maybe_perform_syscall (SIM_DESC sd, int call_addr)
     {
       /* Syscall!  */
       int syscall_num = call_addr & 0x3f;
-      host_callback *cb = STATE_CALLBACK (sd);
-      CB_SYSCALL sc;
-
-      CB_SYSCALL_INIT (&sc);
-
-      sc.func = syscall_num;
-      sc.arg1 = MSP430_CPU (sd)->state.regs[12];
-      sc.arg2 = MSP430_CPU (sd)->state.regs[13];
-      sc.arg3 = MSP430_CPU (sd)->state.regs[14];
-      sc.arg4 = MSP430_CPU (sd)->state.regs[15];
-
-      if (TRACE_SYSCALL_P (MSP430_CPU (sd)))
-	{
-	  const char *syscall_name = "*unknown*";
-
-	  switch (syscall_num)
-	    {
-	    case TARGET_SYS_exit:
-	      syscall_name = "exit(%d)";
-	      break;
-	    case TARGET_SYS_open:
-	      syscall_name = "open(%#x,%#x)";
-	      break;
-	    case TARGET_SYS_close:
-	      syscall_name = "close(%d)";
-	      break;
-	    case TARGET_SYS_read:
-	      syscall_name = "read(%d,%#x,%d)";
-	      break;
-	    case TARGET_SYS_write:
-	      syscall_name = "write(%d,%#x,%d)";
-	      break;
-	    }
-	  trace_generic (sd, MSP430_CPU (sd), TRACE_SYSCALL_IDX,
-			 syscall_name, sc.arg1, sc.arg2, sc.arg3, sc.arg4);
-	}
-
-      /* Handle SYS_exit here.  */
-      if (syscall_num == 1)
-	{
-	  sim_engine_halt (sd, MSP430_CPU (sd), NULL,
-			   MSP430_CPU (sd)->state.regs[0],
-			   sim_exited, sc.arg1);
-	  return 1;
-	}
-
-      sc.p1 = sd;
-      sc.p2 = MSP430_CPU (sd);
-      sc.read_mem = sim_syscall_read_mem;
-      sc.write_mem = sim_syscall_write_mem;
-
-      cb_syscall (cb, &sc);
-
-      TRACE_SYSCALL (MSP430_CPU (sd), "returns %ld", sc.result);
-
-      MSP430_CPU (sd)->state.regs[12] = sc.result;
+      int arg1 = MSP430_CPU (sd)->state.regs[12];
+      int arg2 = MSP430_CPU (sd)->state.regs[13];
+      int arg3 = MSP430_CPU (sd)->state.regs[14];
+      int arg4 = MSP430_CPU (sd)->state.regs[15];
+
+      MSP430_CPU (sd)->state.regs[12] = sim_syscall (MSP430_CPU (sd),
+						     syscall_num, arg1, arg2,
+						     arg3, arg4);
       return 1;
     }