Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 213 insertions, 0 deletions

diff --git a/sim/i960/traps.c b/sim/i960/traps.c
new file mode 100644
index 0000000..5b62ca1
--- /dev/null
+++ b/sim/i960/traps.c
@@ -0,0 +1,213 @@
+/* i960 exception, interrupt, and trap (EIT) support
+   Copyright (C) 1998, 1999 Free Software Foundation, Inc.
+   Contributed by Cygnus Solutions.
+
+This file is part of GDB, the GNU debugger.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "sim-main.h"
+#include "targ-vals.h"
+
+/* The semantic code invokes this for illegal (unrecognized) instructions.  */
+
+void
+sim_engine_invalid_insn (SIM_CPU *current_cpu, IADDR cia)
+{
+  SIM_DESC sd = CPU_STATE (current_cpu);
+
+#if 0
+  if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)
+    {
+      h_bsm_set (current_cpu, h_sm_get (current_cpu));
+      h_bie_set (current_cpu, h_ie_get (current_cpu));
+      h_bcond_set (current_cpu, h_cond_get (current_cpu));
+      /* sm not changed */
+      h_ie_set (current_cpu, 0);
+      h_cond_set (current_cpu, 0);
+
+      h_bpc_set (current_cpu, cia);
+
+      sim_engine_restart (CPU_STATE (current_cpu), current_cpu, NULL,
+			  EIT_RSVD_INSN_ADDR);
+    }
+  else
+#endif
+    sim_engine_halt (sd, current_cpu, NULL, cia, sim_stopped, SIM_SIGILL);
+}
+
+/* Process an address exception.  */
+
+void
+i960_core_signal (SIM_DESC sd, SIM_CPU *current_cpu, sim_cia cia,
+		  unsigned int map, int nr_bytes, address_word addr,
+		  transfer_type transfer, sim_core_signals sig)
+{
+#if 0
+  if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)
+    {
+      h_bsm_set (current_cpu, h_sm_get (current_cpu));
+      h_bie_set (current_cpu, h_ie_get (current_cpu));
+      h_bcond_set (current_cpu, h_cond_get (current_cpu));
+      /* sm not changed */
+      h_ie_set (current_cpu, 0);
+      h_cond_set (current_cpu, 0);
+
+      h_bpc_set (current_cpu, cia);
+
+      sim_engine_restart (CPU_STATE (current_cpu), current_cpu, NULL,
+			  EIT_ADDR_EXCP_ADDR);
+    }
+  else
+#endif
+    sim_core_signal (sd, current_cpu, cia, map, nr_bytes, addr,
+		     transfer, sig);
+}
+
+/* Read/write functions for system call interface.  */
+
+static int
+syscall_read_mem (host_callback *cb, struct cb_syscall *sc,
+		  unsigned long taddr, char *buf, int bytes)
+{
+  SIM_DESC sd = (SIM_DESC) sc->p1;
+  SIM_CPU *cpu = (SIM_CPU *) sc->p2;
+
+  return sim_core_read_buffer (sd, cpu, read_map, buf, taddr, bytes);
+}
+
+static int
+syscall_write_mem (host_callback *cb, struct cb_syscall *sc,
+		   unsigned long taddr, const char *buf, int bytes)
+{
+  SIM_DESC sd = (SIM_DESC) sc->p1;
+  SIM_CPU *cpu = (SIM_CPU *) sc->p2;
+
+  return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes);
+}
+
+/* Trap support.
+   The result is the pc address to continue at.
+   Preprocessing like saving the various registers has already been done.  */
+
+USI
+i960_trap (SIM_CPU *current_cpu, PCADDR pc, int num)
+{
+  SIM_DESC sd = CPU_STATE (current_cpu);
+  host_callback *cb = STATE_CALLBACK (sd);
+
+#ifdef SIM_HAVE_BREAKPOINTS
+  /* Check for breakpoints "owned" by the simulator first, regardless
+     of --environment.  */
+  if (num == TRAP_BREAKPOINT)
+    {
+      /* First try sim-break.c.  If it's a breakpoint the simulator "owns"
+	 it doesn't return.  Otherwise it returns and let's us try.  */
+      sim_handle_breakpoint (sd, current_cpu, pc);
+      /* Fall through.  */
+    }
+#endif
+
+#if 0
+  /* ??? wilson, don't know what this does.  */
+  if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)
+    {
+      /* The new pc is the trap vector entry.
+	 We assume there's a branch there to some handler.  */
+      USI new_pc = EIT_TRAP_BASE_ADDR + num * 4;
+      return new_pc;
+    }
+#endif
+
+  switch (num)
+    {
+    default:
+    case TRAP_SYSCALL :
+      {
+	CB_SYSCALL s;
+
+	CB_SYSCALL_INIT (&s);
+	s.func = num;
+	s.arg1 = a_i960_h_gr_get (current_cpu, 16);
+	s.arg2 = a_i960_h_gr_get (current_cpu, 17);
+	s.arg3 = a_i960_h_gr_get (current_cpu, 18);
+
+	if (s.func == TARGET_SYS_exit)
+	  {
+	    sim_engine_halt (sd, current_cpu, NULL, pc, sim_exited, s.arg1);
+	  }
+
+	s.p1 = (PTR) sd;
+	s.p2 = (PTR) current_cpu;
+	s.read_mem = syscall_read_mem;
+	s.write_mem = syscall_write_mem;
+	cb_syscall (cb, &s);
+	/* ??? This stuff is probably wrong, but libgloss doesn't look at
+	   these values, so it shouldn't matter.  */
+	a_i960_h_gr_set (current_cpu, 18, s.errcode);
+	a_i960_h_gr_set (current_cpu, 16, s.result);
+	a_i960_h_gr_set (current_cpu, 17, s.result2);
+	break;
+      }
+
+    case TRAP_BREAKPOINT:
+      sim_engine_halt (sd, current_cpu, NULL, NULL_CIA,
+		       sim_stopped, SIM_SIGTRAP);
+      break;
+
+#if 0
+      /* ??? wilson, don't know what this does.  */
+    default :
+      {
+	USI new_pc = EIT_TRAP_BASE_ADDR + num * 4;
+	return new_pc;
+      }
+#endif
+    }
+
+  /* Fake an "rte" insn.  */
+  /* FIXME: Should duplicate all of rte processing.  */
+  return (pc & -4) + 4;
+}
+
+/* Breakpoint support.
+   The result is the pc address to continue at.  */
+/* ??? This is an editted copy of the above.  */
+
+USI
+i960_breakpoint (SIM_CPU *current_cpu, PCADDR pc)
+{
+  SIM_DESC sd = CPU_STATE (current_cpu);
+  host_callback *cb = STATE_CALLBACK (sd);
+
+#ifdef SIM_HAVE_BREAKPOINTS
+  /* Check for breakpoints "owned" by the simulator first, regardless
+     of --environment.  */
+  if (num == TRAP_BREAKPOINT)
+    {
+      /* First try sim-break.c.  If it's a breakpoint the simulator "owns"
+	 it doesn't return.  Otherwise it returns and let's us try.  */
+      sim_handle_breakpoint (sd, current_cpu, pc);
+      /* Fall through.  */
+    }
+#endif
+
+  sim_engine_halt (sd, current_cpu, NULL, NULL_CIA,
+		   sim_stopped, SIM_SIGTRAP);
+
+  /* Fake an "rte" insn.  */
+  /* FIXME: Should duplicate all of rte processing.  */
+  return (pc & -4) + 4;
+}