sim: bpf: include more local headers & fix broken funcs

Various files were not including the relevant headers, or some funcs
were missing prototypes entirely, leading to mismatch between the
actual definition of the functions.  Add includes to a few places and
fix the broken functions that are uncovered as a result.  Fixing some
compile warnings (e.g. missing prototypes) often find real bugs.

sim/bpf/ChangeLog

@@ -1,3 +1,16 @@
+2021-06-27  Mike Frysinger  <vapier@gentoo.org>
+
+	* bpf-helpers.c: Include bpf-helpers.h.
+	* bpf-helpers.h (bpf_trace_printk): Change return type to int.
+	(bpfbf_breakpoint): New prototype.
+	* bpf.c: Include decode-be.h & decode-le.h.
+	(bpfbf_ebpfle_init_idesc_table): Delete prototype.
+	(bpfbf_ebpfbe_init_idesc_table): Delete prototype.
+	(bpfbf_model_insn_after): Add 3rd argument.
+	(bpf_def_model_init): Add 1st argument.
+	(bpfbf_prepare_run): Mark static.
+	* sim-main.h: Include bpf-helpers.h.
+
 2021-06-27  Mike Frysinger  <vapier@gentoo.org>
 
 	* bpf-helpers.c (bpf_trace_printk): Add casts to every value printf.

sim/bpf/bpf-helpers.c

@@ -32,6 +32,8 @@
 #include "cgen-ops.h"
 #include "cpu.h"
 
+#include "bpf-helpers.h"
+
 /* bpf_trace_printk is a printk-like facility for debugging.
 
    In the kernel, it appends a line to the Linux's tracing debugging

sim/bpf/bpf-helpers.h

@@ -26,6 +26,8 @@ enum bpf_kernel_helper
 #undef DEF_HELPER
   };
 
-void bpf_trace_printk (SIM_CPU *current_cpu);
+int bpf_trace_printk (SIM_CPU *current_cpu);
+
+VOID bpfbf_breakpoint (SIM_CPU *current_cpu);
 
 #endif /* ! BPF_HELPERS_H */

sim/bpf/bpf.c

@@ -30,15 +30,12 @@
 #include "cpuall.h"
 #include "decode.h"
 
+#include "decode-be.h"
+#include "decode-le.h"
+
 #include "defs-le.h"  /* For SCACHE */
 #include "bpf-helpers.h"
 
-/* It is not possible to include both defs-le.h and defs-be.h due to
-   duplicated definitions, so we need a bunch of forward declarations
-   here.  */
-extern void bpfbf_ebpfle_init_idesc_table (SIM_CPU *);
-extern void bpfbf_ebpfbe_init_idesc_table (SIM_CPU *);
-
 uint64_t skb_data_offset;
 
 IDESC *bpf_idesc_le;
@@ -84,7 +81,7 @@ bpfbf_model_insn_before (SIM_CPU *current_cpu, int first_p)
 }
 
 void
-bpfbf_model_insn_after (SIM_CPU *current_cpu, int first_p)
+bpfbf_model_insn_after (SIM_CPU *current_cpu, int first_p, int cycles)
 {
   /* XXX */
 }
@@ -209,7 +206,7 @@ bpfbf_breakpoint (SIM_CPU *current_cpu)
    several ISAs.  This should be fixed in CGEN.  */
 
 static void
-bpf_def_model_init (void)
+bpf_def_model_init (SIM_CPU *cpu)
 {
   /* Do nothing.  */
 }
@@ -220,7 +217,7 @@ bpfbf_prepare_run (SIM_CPU *cpu)
   /* Nothing.  */
 }
 
-void
+static void
 bpf_engine_run_full (SIM_CPU *cpu)
 {
   if (CURRENT_TARGET_BYTE_ORDER == BFD_ENDIAN_LITTLE)

sim/bpf/sim-main.h

@@ -27,6 +27,7 @@
 #include "sim-base.h"
 #include "cgen-sim.h"
 #include "bpf-sim.h"
+#include "bpf-helpers.h"
 
 
 struct _sim_cpu