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authorGabe Black <gblack@eecs.umich.edu>2012-05-25 00:55:24 -0700
committerGabe Black <gblack@eecs.umich.edu>2012-05-25 00:55:24 -0700
commiteae1e97fb002b44a9d8c46df2da1ddc1d0156ce4 (patch)
tree56805ea5d0817aff8febe4bea280f4cb5e5f8acf /src/cpu
parent276f3e9535e72c8e9764b5f7369e1fa9eb055055 (diff)
downloadgem5-eae1e97fb002b44a9d8c46df2da1ddc1d0156ce4.tar.xz
ISA: Make the decode function part of the ISA's decoder.
Diffstat (limited to 'src/cpu')
-rw-r--r--src/cpu/SConscript1
-rw-r--r--src/cpu/decode_cache.cc113
-rw-r--r--src/cpu/decode_cache.hh84
3 files changed, 124 insertions, 74 deletions
diff --git a/src/cpu/SConscript b/src/cpu/SConscript
index e1ba59b8b..4b327f8a1 100644
--- a/src/cpu/SConscript
+++ b/src/cpu/SConscript
@@ -108,6 +108,7 @@ SimObject('NativeTrace.py')
Source('activity.cc')
Source('base.cc')
Source('cpuevent.cc')
+Source('decode_cache.cc')
Source('exetrace.cc')
Source('func_unit.cc')
Source('inteltrace.cc')
diff --git a/src/cpu/decode_cache.cc b/src/cpu/decode_cache.cc
new file mode 100644
index 000000000..636bf9284
--- /dev/null
+++ b/src/cpu/decode_cache.cc
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2011-2012 Google
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Gabe Black
+ */
+
+#include "arch/decoder.hh"
+#include "arch/isa_traits.hh"
+#include "arch/types.hh"
+#include "base/hashmap.hh"
+#include "config/the_isa.hh"
+#include "cpu/static_inst.hh"
+
+void
+DecodeCache::DecodePages::update(PageIt recentest)
+{
+ recent[1] = recent[0];
+ recent[0] = recentest;
+}
+
+void
+DecodeCache::DecodePages::addPage(Addr addr, DecodePage *page)
+{
+ Addr page_addr = addr & ~(TheISA::PageBytes - 1);
+ typename PageMap::value_type to_insert(page_addr, page);
+ update(pageMap.insert(to_insert).first);
+}
+
+DecodeCache::DecodePages::DecodePages()
+{
+ recent[0] = recent[1] = pageMap.end();
+}
+
+DecodeCache::DecodePage *
+DecodeCache::DecodePages::getPage(Addr addr)
+{
+ Addr page_addr = addr & ~(TheISA::PageBytes - 1);
+
+ // Check against recent lookups.
+ if (recent[0] != pageMap.end()) {
+ if (recent[0]->first == page_addr)
+ return recent[0]->second;
+ if (recent[1] != pageMap.end() &&
+ recent[1]->first == page_addr) {
+ update(recent[1]);
+ // recent[1] has just become recent[0].
+ return recent[0]->second;
+ }
+ }
+
+ // Actually look in the has_map.
+ PageIt it = pageMap.find(page_addr);
+ if (it != pageMap.end()) {
+ update(it);
+ return it->second;
+ }
+
+ // Didn't find an existing page, so add a new one.
+ DecodePage *newPage = new DecodePage;
+ addPage(page_addr, newPage);
+ return newPage;
+}
+
+StaticInstPtr
+DecodeCache::decode(TheISA::Decoder *decoder,
+ ExtMachInst mach_inst, Addr addr)
+{
+ // Try to find a matching address based table of instructions.
+ DecodePage *page = decodePages.getPage(addr);
+
+ // Use the table to decode the instruction. It will fall back to other
+ // mechanisms if it needs to.
+ Addr offset = addr & (TheISA::PageBytes - 1);
+ StaticInstPtr si = page->insts[offset];
+ if (si && (si->machInst == mach_inst))
+ return si;
+
+ InstMap::iterator iter = instMap.find(mach_inst);
+ if (iter != instMap.end()) {
+ si = iter->second;
+ page->insts[offset] = si;
+ return si;
+ }
+
+ si = decoder->decodeInst(mach_inst);
+ instMap[mach_inst] = si;
+ page->insts[offset] = si;
+ return si;
+}
diff --git a/src/cpu/decode_cache.hh b/src/cpu/decode_cache.hh
index 6ed820332..473340586 100644
--- a/src/cpu/decode_cache.hh
+++ b/src/cpu/decode_cache.hh
@@ -37,9 +37,11 @@
#include "config/the_isa.hh"
#include "cpu/static_inst.hh"
-typedef StaticInstPtr (*DecodeInstFunc)(TheISA::ExtMachInst);
+namespace TheISA
+{
+ class Decoder;
+}
-template <DecodeInstFunc decodeInstFunc>
class DecodeCache
{
private:
@@ -63,92 +65,26 @@ class DecodeCache
/// Update the small cache of recent lookups.
/// @param recentest The most recent result;
- void
- update(PageIt recentest)
- {
- recent[1] = recent[0];
- recent[0] = recentest;
- }
-
- void
- addPage(Addr addr, DecodePage *page)
- {
- Addr page_addr = addr & ~(TheISA::PageBytes - 1);
- typename PageMap::value_type to_insert(page_addr, page);
- update(pageMap.insert(to_insert).first);
- }
+ void update(PageIt recentest);
+ void addPage(Addr addr, DecodePage *page);
public:
/// Constructor
- DecodePages()
- {
- recent[0] = recent[1] = pageMap.end();
- }
+ DecodePages();
/// Attempt to find the DecodePage which goes with a particular
/// address. First check the small cache of recent results, then
/// actually look in the hash_map.
/// @param addr The address to look up.
- DecodePage *
- getPage(Addr addr)
- {
- Addr page_addr = addr & ~(TheISA::PageBytes - 1);
-
- // Check against recent lookups.
- if (recent[0] != pageMap.end()) {
- if (recent[0]->first == page_addr)
- return recent[0]->second;
- if (recent[1] != pageMap.end() &&
- recent[1]->first == page_addr) {
- update(recent[1]);
- // recent[1] has just become recent[0].
- return recent[0]->second;
- }
- }
-
- // Actually look in the has_map.
- PageIt it = pageMap.find(page_addr);
- if (it != pageMap.end()) {
- update(it);
- return it->second;
- }
-
- // Didn't find an existing page, so add a new one.
- DecodePage *newPage = new DecodePage;
- addPage(page_addr, newPage);
- return newPage;
- }
+ DecodePage *getPage(Addr addr);
} decodePages;
public:
/// Decode a machine instruction.
/// @param mach_inst The binary instruction to decode.
/// @retval A pointer to the corresponding StaticInst object.
- StaticInstPtr
- decode(ExtMachInst mach_inst, Addr addr)
- {
- // Try to find a matching address based table of instructions.
- DecodePage *page = decodePages.getPage(addr);
-
- // Use the table to decode the instruction. It will fall back to other
- // mechanisms if it needs to.
- Addr offset = addr & (TheISA::PageBytes - 1);
- StaticInstPtr si = page->insts[offset];
- if (si && (si->machInst == mach_inst))
- return si;
-
- InstMap::iterator iter = instMap.find(mach_inst);
- if (iter != instMap.end()) {
- si = iter->second;
- page->insts[offset] = si;
- return si;
- }
-
- si = decodeInstFunc(mach_inst);
- instMap[mach_inst] = si;
- page->insts[offset] = si;
- return si;
- }
+ StaticInstPtr decode(TheISA::Decoder * const decoder,
+ ExtMachInst mach_inst, Addr addr);
};
#endif // __CPU_DECODE_CACHE_HH__