sim: add syscall tracing level

It's useful to be able to trace just the system calls the simulated
program is calling, so add a new --trace-syscall option for ports to
leverage if they choose.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

sim/common/ChangeLog

@@ -1,3 +1,14 @@
+2011-05-25  Mike Frysinger  <vapier@gentoo.org>
+
+	* sim-trace.c (OPTION_TRACE_SYSCALL): New enum.
+	(trace_options): Handle "trace-syscall" with OPTION_TRACE_SYSCALL.
+	(trace_option_handler): Handle OPTION_TRACE_SYSCALL.
+	(trace_idx_to_str): Likewise.
+	* sim-trace.h (TRACE_SYSCALL_IDX): New enum.
+	(TRACE_syscall): Define.
+	(WITH_TRACE_SYSCALL_P): Likewise.
+	(TRACE_SYSCALL_P): Likewise.
+
 2011-05-23  Mike Frysinger  <vapier@gentoo.org>
 
 	* dv-glue.c (hw_glue_finish): Move "name" to function scope and

sim/common/sim-trace.c

@@ -77,7 +77,8 @@ enum {
   OPTION_TRACE_FUNCTION,
   OPTION_TRACE_DEBUG,
   OPTION_TRACE_FILE,
-  OPTION_TRACE_VPU
+  OPTION_TRACE_VPU,
+  OPTION_TRACE_SYSCALL
 };
 
 static const OPTION trace_options[] =
@@ -125,6 +126,9 @@ static const OPTION trace_options[] =
   { {"trace-events", optional_argument, NULL, OPTION_TRACE_EVENTS},
       '\0', "on|off", "Trace events",
       trace_option_handler, NULL },
+  { {"trace-syscall", optional_argument, NULL, OPTION_TRACE_SYSCALL},
+      '\0', "on|off", "Trace system calls",
+      trace_option_handler, NULL },
 #ifdef SIM_HAVE_ADDR_RANGE
   { {"trace-range", required_argument, NULL, OPTION_TRACE_RANGE},
       '\0', "START,END", "Specify range of addresses for instruction tracing",
@@ -331,6 +335,13 @@ trace_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt,
 	sim_io_eprintf (sd, "Branch tracing not compiled in, `--trace-branch' ignored\n");
       break;
 
+    case OPTION_TRACE_SYSCALL :
+      if (WITH_TRACE_SYSCALL_P)
+	return set_trace_option (sd, "-syscall", TRACE_SYSCALL_IDX, arg);
+      else
+	sim_io_eprintf (sd, "System call tracing not compiled in, `--trace-syscall' ignored\n");
+      break;
+
     case OPTION_TRACE_SEMANTICS :
       if (WITH_TRACE_ALU_P
 	  && WITH_TRACE_FPU_P
@@ -621,6 +632,7 @@ trace_idx_to_str (int trace_idx)
     case TRACE_EVENTS_IDX:  return "events:  ";
     case TRACE_FPU_IDX:     return "fpu:     ";
     case TRACE_BRANCH_IDX:  return "branch:  ";
+    case TRACE_SYSCALL_IDX: return "syscall: ";
     case TRACE_VPU_IDX:     return "vpu:     ";
     default:
       sprintf (num, "?%d?", trace_idx);

sim/common/sim-trace.h

@@ -69,6 +69,9 @@ enum {
   /* Trace branching.  */
   TRACE_BRANCH_IDX,
 
+  /* Trace syscalls.  */
+  TRACE_SYSCALL_IDX,
+
   /* Add information useful for debugging the simulator to trace output.  */
   TRACE_DEBUG_IDX,
 
@@ -105,6 +108,7 @@ enum {
 #define TRACE_fpu      (1 << TRACE_FPU_IDX)
 #define TRACE_vpu      (1 << TRACE_VPU_IDX)
 #define TRACE_branch   (1 << TRACE_BRANCH_IDX)
+#define TRACE_syscall  (1 << TRACE_SYSCALL_IDX)
 #define TRACE_debug    (1 << TRACE_DEBUG_IDX)
 
 /* Preprocessor macros to simplify tests of WITH_TRACE.  */
@@ -120,6 +124,7 @@ enum {
 #define WITH_TRACE_FPU_P	(WITH_TRACE & TRACE_fpu)
 #define WITH_TRACE_VPU_P	(WITH_TRACE & TRACE_vpu)
 #define WITH_TRACE_BRANCH_P	(WITH_TRACE & TRACE_branch)
+#define WITH_TRACE_SYSCALL_P	(WITH_TRACE & TRACE_syscall)
 #define WITH_TRACE_DEBUG_P	(WITH_TRACE & TRACE_debug)
 
 /* Tracing install handler.  */
@@ -217,6 +222,7 @@ typedef struct _trace_data {
 #define TRACE_FPU_P(cpu)	TRACE_P (cpu, TRACE_FPU_IDX)
 #define TRACE_VPU_P(cpu)	TRACE_P (cpu, TRACE_VPU_IDX)
 #define TRACE_BRANCH_P(cpu)	TRACE_P (cpu, TRACE_BRANCH_IDX)
+#define TRACE_SYSCALL_P(cpu)	TRACE_P (cpu, TRACE_SYSCALL_IDX)
 #define TRACE_DEBUG_P(cpu)	TRACE_P (cpu, TRACE_DEBUG_IDX)
 
 /* Tracing functions.  */