sim: bfin: add helpful info for generating test tables

diff --git a/sim/testsuite/sim/bfin/ChangeLog b/sim/testsuite/sim/bfin/ChangeLog
index 753affc..a634494 100644 (file)
--- a/sim/testsuite/sim/bfin/ChangeLog
+++ b/sim/testsuite/sim/bfin/ChangeLog
@@ -1,5 +1,9 @@
 2013-06-17  Mike Frysinger  <vapier@gentoo.org>
 
+       * se_allopcodes.h: Add debugging related comments.
+
+2013-06-17  Mike Frysinger  <vapier@gentoo.org>
+
        * se_allopcodes.h: Do not clear RETN/RETE/RETI.
 
 2012-04-09  Robin Getz  <robin.getz@analog.com>

diff --git a/sim/testsuite/sim/bfin/se_allopcodes.h b/sim/testsuite/sim/bfin/se_allopcodes.h
index b49862a..8f96125 100644 (file)
--- a/sim/testsuite/sim/bfin/se_allopcodes.h
+++ b/sim/testsuite/sim/bfin/se_allopcodes.h
@@ -129,6 +129,25 @@ _match_done:
        jump _next_instruction;
 
 _new_instruction:
+       /* The table is generated in memory and can be extracted:
+          (gdb) dump binary memory bin &table next_location
+
+          16bit:
+          $ od -j6 -x --width=4 bin | \
+            awk '{ s=last; e=strtonum("0x"$2); \
+              printf "\t.dw 0x%04x,\t0x%04x,\t\t0x%02x\n", \
+                 s, e-1, strtonum("0x"seq); \
+              last=e; seq=$3}'
+
+          32bit:
+          $ od -j12 -x --width=8 bin | \
+            awk '{ s=last; e=strtonum("0x"$3$2); \
+              printf "\t.dw 0x%04x, 0x%04x,\t0x%04x, 0x%04x,\t\t0x%02x, 0\n", \
+                 and(s,0xffff), rshift(s,16), and(e-1,0xffff), rshift(e-1,16), \
+                 strtonum("0x"seq); \
+              last=e; seq=$3}'
+
+          This should be much faster than dumping over serial/jtag.  */
        se_all_new_insn_stub
 
        /* output the insn (R0) and excause (R3) if diff from last */