Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 250 insertions, 0 deletions

diff --git a/sim/ppc/gen-semantics.c b/sim/ppc/gen-semantics.c
new file mode 100644
index 0000000..b4c0613
--- /dev/null
+++ b/sim/ppc/gen-semantics.c
@@ -0,0 +1,250 @@
+/*  This file is part of the program psim.
+
+    Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
+
+    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 of the License, 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 "misc.h"
+#include "lf.h"
+#include "table.h"
+#include "filter.h"
+
+#include "ld-decode.h"
+#include "ld-cache.h"
+#include "ld-insn.h"
+
+#include "igen.h"
+
+#include "gen-semantics.h"
+#include "gen-icache.h"
+#include "gen-idecode.h"
+
+
+static void
+print_semantic_function_header(lf *file,
+			       const char *basename,
+			       insn_bits *expanded_bits,
+			       int is_function_definition)
+{
+  int indent;
+  lf_printf(file, "\n");
+  lf_print_function_type(file, SEMANTIC_FUNCTION_TYPE, "EXTERN_SEMANTICS",
+			 (is_function_definition ? "\n" : " "));
+  indent = print_function_name(file,
+			       basename,
+			       expanded_bits,
+			       function_name_prefix_semantics);
+  if (is_function_definition)
+    lf_indent(file, +indent);
+  else
+    lf_printf(file, "\n");
+  lf_printf(file, "(%s)", SEMANTIC_FUNCTION_FORMAL);
+  if (is_function_definition)
+    lf_indent(file, -indent);
+  else
+    lf_printf(file, ";");
+  lf_printf(file, "\n");
+}
+
+void
+print_semantic_declaration(insn_table *entry,
+			   lf *file,
+			   void *data,
+			   insn *instruction,
+			   int depth)
+{
+  if (generate_expanded_instructions) {
+    ASSERT(entry->nr_insn == 1);
+    print_semantic_function_header(file,
+				   instruction->file_entry->fields[insn_name],
+				   entry->expanded_bits,
+				   0/* is not function definition*/);
+  }
+  else {
+    print_semantic_function_header(file,
+				   instruction->file_entry->fields[insn_name],
+				   NULL,
+				   0/* is not function definition*/);
+  }
+}
+
+
+
+/* generate the semantics.c file */
+
+
+void
+print_idecode_illegal(lf *file,
+		      const char *result)
+{
+  if ((code & generate_jumps))
+    lf_printf(file, "goto %s_illegal;\n", (code & generate_with_icache) ? "icache" : "semantic");
+  else if ((code & generate_with_icache))
+    lf_printf(file, "%s icache_illegal(%s);\n", result, ICACHE_FUNCTION_ACTUAL);
+  else
+    lf_printf(file, "%s semantic_illegal(%s);\n", result, SEMANTIC_FUNCTION_ACTUAL);
+}
+
+
+void
+print_semantic_body(lf *file,
+		    insn *instruction,
+		    insn_bits *expanded_bits,
+		    opcode_field *opcodes)
+{
+  print_itrace(file, instruction->file_entry, 0/*put_value_in_cache*/);
+
+  /* validate the instruction, if a cache this has already been done */
+  if (!(code & generate_with_icache))
+    print_idecode_validate(file, instruction, opcodes);
+
+  /* generate the profiling call - this is delayed until after the
+     instruction has been verified */
+  lf_printf(file, "\n");
+  lf_printf(file, "/* monitoring: */\n");
+  lf_printf(file, "if (WITH_MON & MONITOR_INSTRUCTION_ISSUE) {\n");
+  lf_printf(file, "  mon_issue(");
+  print_function_name(file,
+		      instruction->file_entry->fields[insn_name],
+		      NULL,
+		      function_name_prefix_itable);
+  lf_printf(file, ", processor, cia);\n");
+  lf_printf(file, "}\n");
+
+  /* generate the code (or at least something */
+  lf_printf(file, "\n");
+  lf_printf(file, "/* semantics: */\n");
+  lf_printf(file, "nia = cia + %d;\n", insn_bit_size / 8);
+  if (instruction->file_entry->annex != NULL) {
+    /* true code */
+    table_entry_print_cpp_line_nr(file, instruction->file_entry);
+    lf_printf(file, "{\n");
+    lf_indent(file, +2);
+    lf_print__c_code(file, instruction->file_entry->annex);
+    lf_indent(file, -2);
+    lf_printf(file, "}\n");
+    lf_print__internal_reference(file);
+  }
+  else if (it_is("nop", instruction->file_entry->fields[insn_flags])) {
+    lf_print__internal_reference(file);
+  }
+  else {
+    /* abort so it is implemented now */
+    table_entry_print_cpp_line_nr(file, instruction->file_entry);
+    lf_putstr(file, "error(\"%s:%d:0x%08lx:%s unimplemented\\n\",\n");
+    lf_printf(file, "      itable[MY_INDEX].file, itable[MY_INDEX].line_nr, (long)cia, itable[MY_INDEX].name);\n");
+    lf_print__internal_reference(file);
+  }
+}
+
+static void
+print_c_semantic(lf *file,
+		 insn *instruction,
+		 insn_bits *expanded_bits,
+		 opcode_field *opcodes,
+		 cache_table *cache_rules)
+{
+
+  lf_printf(file, "{\n");
+  lf_indent(file, +2);
+
+  print_my_defines(file, expanded_bits, instruction->file_entry);
+  lf_printf(file, "\n");
+  print_icache_body(file,
+		    instruction,
+		    expanded_bits,
+		    cache_rules,
+		    ((code & generate_with_direct_access)
+		     ? define_variables
+		     : declare_variables),
+		    ((code & generate_with_icache)
+		     ? get_values_from_icache
+		     : do_not_use_icache));
+
+  lf_printf(file, "unsigned_word nia;\n");
+  print_semantic_body(file,
+		      instruction,
+		      expanded_bits,
+		      opcodes);
+  lf_printf(file, "return nia;\n");
+
+  /* generate something to clean up any #defines created for the cache */
+  if (code & generate_with_direct_access)
+    print_icache_body(file,
+		      instruction,
+		      expanded_bits,
+		      cache_rules,
+		      undef_variables,
+		      ((code & generate_with_icache)
+		       ? get_values_from_icache
+		       : do_not_use_icache));
+
+  lf_indent(file, -2);
+  lf_printf(file, "}\n");
+}
+
+static void
+print_c_semantic_function(lf *file,
+			  insn *instruction,
+			  insn_bits *expanded_bits,
+			  opcode_field *opcodes,
+			  cache_table *cache_rules)
+{
+  /* build the semantic routine to execute the instruction */
+  print_semantic_function_header(file,
+				 instruction->file_entry->fields[insn_name],
+				 expanded_bits,
+				 1/*is-function-definition*/);
+  print_c_semantic(file,
+		   instruction,
+		   expanded_bits,
+		   opcodes,
+		   cache_rules);
+}
+
+void
+print_semantic_definition(insn_table *entry,
+			  lf *file,
+			  void *data,
+			  insn *instruction,
+			  int depth)
+{
+  cache_table *cache_rules = (cache_table*)data;
+  if (generate_expanded_instructions) {
+    ASSERT(entry->nr_insn == 1
+	   && entry->opcode == NULL
+	   && entry->parent != NULL
+	   && entry->parent->opcode != NULL);
+    ASSERT(entry->nr_insn == 1
+	   && entry->opcode == NULL
+	   && entry->parent != NULL
+	   && entry->parent->opcode != NULL
+	   && entry->parent->opcode_rule != NULL);
+    print_c_semantic_function(file,
+			      entry->insns,
+			      entry->expanded_bits,
+			      entry->parent->opcode,
+			      cache_rules);
+  }
+  else {
+    print_c_semantic_function(file, instruction,
+			      NULL, NULL,
+			      cache_rules);
+  }
+}