From a6bac4ada53c465718e01fad0a7b0c57ef7687d8 Mon Sep 17 00:00:00 2001
From: Andrew Waterman <waterman@s141.Millennium.Berkeley.EDU>
Date: Fri, 10 Jun 2011 19:54:02 -0700
Subject: [sim, opcodes] made sim more decoupled from opcodes

---
 parse-opcodes  | 64 +++++-----------------------------------------------------
 update-opcodes |  2 +-
 2 files changed, 6 insertions(+), 60 deletions(-)

diff --git a/parse-opcodes b/parse-opcodes
index 4cf0b84..707947e 100755
--- a/parse-opcodes
+++ b/parse-opcodes
@@ -85,64 +85,10 @@ def make_disasm_table(match,mask):
     print '#define MATCH_%s %s' % (name2, hex(match))
     print '#define  MASK_%s %s' % (name2, hex(mask[name]))
 
-def make_switch(match, mask, dir):
-  switch_base = 0
-  switch_size = 10
-  switch_mask = ((1<<(switch_base+switch_size))-(1<<switch_base))
-
-  f = open('%s/dispatch_decl.h' % dir, 'w')
-  f.write('/* Automatically generated by parse-opcodes */\n')
-  f.write('#define dispatch_index(insn) (((insn).bits >> %d) & %d)\n' % (switch_base, (1<<switch_size)-1))
-  for opc in range(0,1<<switch_size):
-    f.write('reg_t opcode_func_%03x(insn_t insn, reg_t pc);\n' % opc)
-  f.close()
-
-  f = open('%s/dispatch.h' % dir, 'w')
-  f.write('/* Automatically generated by parse-opcodes */\n')
-  f.write('typedef reg_t (*insn_func_t)(processor_t*, insn_t, reg_t);\n')
-  f.write('const static insn_func_t dispatch_table[] = {\n')
-  for opc in range(0,1<<switch_size):
-    f.write('  (insn_func_t)&processor_t::opcode_func_%03x,\n' % opc)
-  f.write('};\n')
-  f.close()
-
-  nfiles = 10
-  for file in range(0, nfiles):
-    f = open('%s/dispatch_%x.cc' % (dir, file), 'w')
-    f.write('#include "insn_includes.h"\n\n')
-    
-    for opc in range(0, 1<<switch_size):
-      if opc % nfiles != file:
-        continue
-      f.write('reg_t processor_t::opcode_func_%03x(insn_t insn, reg_t pc)\n' % opc)
-      f.write('{\n')
-
-      has_some_instruction = 0
-      exact = 0
-      for name in match.iterkeys():
-        if ((opc << switch_base) & mask[name]) == (match[name] & mask[name] & switch_mask):
-          has_some_instruction = 1
-        if ((opc << switch_base) & mask[name]) == match[name] and (switch_mask & mask[name]) == mask[name]:
-          exact = 1
-
-      for name in match.iterkeys():
-        name2 = name.replace('.','_')
-        if ((opc << switch_base) & mask[name]) == (match[name] & mask[name] & switch_mask):
-          if not exact:
-            f.write('  if((insn.bits & 0x%x) == 0x%x)\n' % (mask[name],match[name]))
-            f.write('  {\n')
-          f.write('    reg_t npc = pc + insn_length(0x%08x);\n' % match[name])
-          f.write('    #include "insns/%s.h"\n' % name2)
-          f.write('    return npc;\n')
-          if not exact:
-            f.write('  }\n')
-
-      if not exact:
-        f.write('  throw trap_illegal_instruction;\n')
-
-      f.write('}\n\n')
-
-    f.close()
+def make_switch(match, mask):
+  for name in match.iterkeys():
+    name2 = name.replace('.','_')
+    print 'DECLARE_INSN(%s, 0x%x, 0x%x)' % (name2, match[name], mask[name])
 
 def yank(num,start,len):
   return (num >> start) & ((1 << len) - 1)
@@ -839,6 +785,6 @@ elif sys.argv[1] == '-verilog':
 elif sys.argv[1] == '-disasm':
   make_disasm_table(match,mask)
 elif sys.argv[1] == '-switch':
-  make_switch(match,mask,sys.argv[2])
+  make_switch(match,mask)
 else:
   assert 0
diff --git a/update-opcodes b/update-opcodes
index 6f88671..5df9fa3 100755
--- a/update-opcodes
+++ b/update-opcodes
@@ -3,4 +3,4 @@
 ./parse-opcodes -verilog < opcodes > inst.v
 ./parse-opcodes -disasm < opcodes > ../xcc/src/include/opcode/mips-riscv-opc.h
 ./parse-opcodes -disasm < opcodes > ../pk/pk/riscv-opc.h
-./parse-opcodes -switch ../sim/riscv < opcodes
+./parse-opcodes -switch < opcodes > ../sim/riscv/opcodes.h
-- 
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