Arch-abstraction:
- In Cachegrind, abstract out x86-specific use of CPUID to find cache
configuration. Required adding a cachegrind/x86/ directory, and fiddling
a bit with the build system.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2698 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/cachegrind/x86/cg_arch.c b/cachegrind/x86/cg_arch.c
new file mode 100644
index 0000000..a104d2d
--- /dev/null
+++ b/cachegrind/x86/cg_arch.c
@@ -0,0 +1,359 @@
+
+/*--------------------------------------------------------------------*/
+/*--- Arch-specific definitions. x86/cg_arch.c ---*/
+/*--------------------------------------------------------------------*/
+
+/*
+ This file is part of Cachegrind, a Valgrind tool for cache
+ profiling programs.
+
+ Copyright (C) 2002-2004 Nicholas Nethercote
+ njn25@cam.ac.uk
+
+ 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.
+
+ The GNU General Public License is contained in the file COPYING.
+*/
+
+#include "tool.h"
+#include "cg_arch.h"
+
+// All CPUID info taken from sandpile.org/a32/cpuid.htm */
+// Probably only works for Intel and AMD chips, and probably only for some of
+// them.
+
+static void micro_ops_warn(Int actual_size, Int used_size, Int line_size)
+{
+ VG_(message)(Vg_DebugMsg,
+ "warning: Pentium with %d K micro-op instruction trace cache",
+ actual_size);
+ VG_(message)(Vg_DebugMsg,
+ " Simulating a %d KB cache with %d B lines",
+ used_size, line_size);
+}
+
+/* Intel method is truly wretched. We have to do an insane indexing into an
+ * array of pre-defined configurations for various parts of the memory
+ * hierarchy.
+ */
+static
+Int Intel_cache_info(Int level, cache_t* I1c, cache_t* D1c, cache_t* L2c)
+{
+ UChar info[16];
+ Int i, trials;
+ Bool L2_found = False;
+
+ if (level < 2) {
+ VG_(message)(Vg_DebugMsg,
+ "warning: CPUID level < 2 for Intel processor (%d)",
+ level);
+ return -1;
+ }
+
+ VG_(cpuid)(2, (Int*)&info[0], (Int*)&info[4],
+ (Int*)&info[8], (Int*)&info[12]);
+ trials = info[0] - 1; /* AL register - bits 0..7 of %eax */
+ info[0] = 0x0; /* reset AL */
+
+ if (0 != trials) {
+ VG_(message)(Vg_DebugMsg,
+ "warning: non-zero CPUID trials for Intel processor (%d)",
+ trials);
+ return -1;
+ }
+
+ for (i = 0; i < 16; i++) {
+
+ switch (info[i]) {
+
+ case 0x0: /* ignore zeros */
+ break;
+
+ /* TLB info, ignore */
+ case 0x01: case 0x02: case 0x03: case 0x04:
+ case 0x50: case 0x51: case 0x52: case 0x5b: case 0x5c: case 0x5d:
+ case 0xb0: case 0xb3:
+ break;
+
+ case 0x06: *I1c = (cache_t) { 8, 4, 32 }; break;
+ case 0x08: *I1c = (cache_t) { 16, 4, 32 }; break;
+ case 0x30: *I1c = (cache_t) { 32, 8, 64 }; break;
+
+ case 0x0a: *D1c = (cache_t) { 8, 2, 32 }; break;
+ case 0x0c: *D1c = (cache_t) { 16, 4, 32 }; break;
+ case 0x2c: *D1c = (cache_t) { 32, 8, 64 }; break;
+
+ /* IA-64 info -- panic! */
+ case 0x10: case 0x15: case 0x1a:
+ case 0x88: case 0x89: case 0x8a: case 0x8d:
+ case 0x90: case 0x96: case 0x9b:
+ VG_(skin_panic)("IA-64 cache detected?!");
+
+ case 0x22: case 0x23: case 0x25: case 0x29:
+ VG_(message)(Vg_DebugMsg,
+ "warning: L3 cache detected but ignored\n");
+ break;
+
+ /* These are sectored, whatever that means */
+ case 0x39: *L2c = (cache_t) { 128, 4, 64 }; L2_found = True; break;
+ case 0x3c: *L2c = (cache_t) { 256, 4, 64 }; L2_found = True; break;
+
+ /* If a P6 core, this means "no L2 cache".
+ If a P4 core, this means "no L3 cache".
+ We don't know what core it is, so don't issue a warning. To detect
+ a missing L2 cache, we use 'L2_found'. */
+ case 0x40:
+ break;
+
+ case 0x41: *L2c = (cache_t) { 128, 4, 32 }; L2_found = True; break;
+ case 0x42: *L2c = (cache_t) { 256, 4, 32 }; L2_found = True; break;
+ case 0x43: *L2c = (cache_t) { 512, 4, 32 }; L2_found = True; break;
+ case 0x44: *L2c = (cache_t) { 1024, 4, 32 }; L2_found = True; break;
+ case 0x45: *L2c = (cache_t) { 2048, 4, 32 }; L2_found = True; break;
+
+ /* These are sectored, whatever that means */
+ case 0x66: *D1c = (cache_t) { 8, 4, 64 }; break; /* sectored */
+ case 0x67: *D1c = (cache_t) { 16, 4, 64 }; break; /* sectored */
+ case 0x68: *D1c = (cache_t) { 32, 4, 64 }; break; /* sectored */
+
+ /* HACK ALERT: Instruction trace cache -- capacity is micro-ops based.
+ * conversion to byte size is a total guess; treat the 12K and 16K
+ * cases the same since the cache byte size must be a power of two for
+ * everything to work!. Also guessing 32 bytes for the line size...
+ */
+ case 0x70: /* 12K micro-ops, 8-way */
+ *I1c = (cache_t) { 16, 8, 32 };
+ micro_ops_warn(12, 16, 32);
+ break;
+ case 0x71: /* 16K micro-ops, 8-way */
+ *I1c = (cache_t) { 16, 8, 32 };
+ micro_ops_warn(16, 16, 32);
+ break;
+ case 0x72: /* 32K micro-ops, 8-way */
+ *I1c = (cache_t) { 32, 8, 32 };
+ micro_ops_warn(32, 32, 32);
+ break;
+
+ /* These are sectored, whatever that means */
+ case 0x79: *L2c = (cache_t) { 128, 8, 64 }; L2_found = True; break;
+ case 0x7a: *L2c = (cache_t) { 256, 8, 64 }; L2_found = True; break;
+ case 0x7b: *L2c = (cache_t) { 512, 8, 64 }; L2_found = True; break;
+ case 0x7c: *L2c = (cache_t) { 1024, 8, 64 }; L2_found = True; break;
+ case 0x7e: *L2c = (cache_t) { 256, 8, 128 }; L2_found = True; break;
+
+ case 0x81: *L2c = (cache_t) { 128, 8, 32 }; L2_found = True; break;
+ case 0x82: *L2c = (cache_t) { 256, 8, 32 }; L2_found = True; break;
+ case 0x83: *L2c = (cache_t) { 512, 8, 32 }; L2_found = True; break;
+ case 0x84: *L2c = (cache_t) { 1024, 8, 32 }; L2_found = True; break;
+ case 0x85: *L2c = (cache_t) { 2048, 8, 32 }; L2_found = True; break;
+ case 0x86: *L2c = (cache_t) { 512, 4, 64 }; L2_found = True; break;
+ case 0x87: *L2c = (cache_t) { 1024, 8, 64 }; L2_found = True; break;
+
+ default:
+ VG_(message)(Vg_DebugMsg,
+ "warning: Unknown Intel cache config value "
+ "(0x%x), ignoring", info[i]);
+ break;
+ }
+ }
+
+ if (!L2_found)
+ VG_(message)(Vg_DebugMsg,
+ "warning: L2 cache not installed, ignore L2 results.");
+
+ return 0;
+}
+
+/* AMD method is straightforward, just extract appropriate bits from the
+ * result registers.
+ *
+ * Bits, for D1 and I1:
+ * 31..24 data L1 cache size in KBs
+ * 23..16 data L1 cache associativity (FFh=full)
+ * 15.. 8 data L1 cache lines per tag
+ * 7.. 0 data L1 cache line size in bytes
+ *
+ * Bits, for L2:
+ * 31..16 unified L2 cache size in KBs
+ * 15..12 unified L2 cache associativity (0=off, FFh=full)
+ * 11.. 8 unified L2 cache lines per tag
+ * 7.. 0 unified L2 cache line size in bytes
+ *
+ * #3 The AMD K7 processor's L2 cache must be configured prior to relying
+ * upon this information. (Whatever that means -- njn)
+ *
+ * Also, according to Cyrille Chepelov, Duron stepping A0 processors (model
+ * 0x630) have a bug and misreport their L2 size as 1KB (it's really 64KB),
+ * so we detect that.
+ *
+ * Returns 0 on success, non-zero on failure.
+ */
+static
+Int AMD_cache_info(cache_t* I1c, cache_t* D1c, cache_t* L2c)
+{
+ UInt ext_level;
+ UInt dummy, model;
+ UInt I1i, D1i, L2i;
+
+ VG_(cpuid)(0x80000000, &ext_level, &dummy, &dummy, &dummy);
+
+ if (0 == (ext_level & 0x80000000) || ext_level < 0x80000006) {
+ VG_(message)(Vg_UserMsg,
+ "warning: ext_level < 0x80000006 for AMD processor (0x%x)",
+ ext_level);
+ return -1;
+ }
+
+ VG_(cpuid)(0x80000005, &dummy, &dummy, &D1i, &I1i);
+ VG_(cpuid)(0x80000006, &dummy, &dummy, &L2i, &dummy);
+
+ VG_(cpuid)(0x1, &model, &dummy, &dummy, &dummy);
+
+ /* Check for Duron bug */
+ if (model == 0x630) {
+ VG_(message)(Vg_UserMsg,
+ "Buggy Duron stepping A0. Assuming L2 size=65536 bytes");
+ L2i = (64 << 16) | (L2i & 0xffff);
+ }
+
+ D1c->size = (D1i >> 24) & 0xff;
+ D1c->assoc = (D1i >> 16) & 0xff;
+ D1c->line_size = (D1i >> 0) & 0xff;
+
+ I1c->size = (I1i >> 24) & 0xff;
+ I1c->assoc = (I1i >> 16) & 0xff;
+ I1c->line_size = (I1i >> 0) & 0xff;
+
+ L2c->size = (L2i >> 16) & 0xffff; /* Nb: different bits used for L2 */
+ L2c->assoc = (L2i >> 12) & 0xf;
+ L2c->line_size = (L2i >> 0) & 0xff;
+
+ return 0;
+}
+
+static jmp_buf cpuid_jmpbuf;
+
+static
+void cpuid_SIGILL_handler(int signum)
+{
+ __builtin_longjmp(cpuid_jmpbuf, 1);
+}
+
+static
+Int get_caches_from_CPUID(cache_t* I1c, cache_t* D1c, cache_t* L2c)
+{
+ Int level, res, ret;
+ Char vendor_id[13];
+ vki_ksigaction sigill_new, sigill_saved;
+
+ /* Install own SIGILL handler */
+ sigill_new.ksa_handler = cpuid_SIGILL_handler;
+ sigill_new.ksa_flags = 0;
+ sigill_new.ksa_restorer = NULL;
+ res = VG_(ksigemptyset)( &sigill_new.ksa_mask );
+ sk_assert(res == 0);
+
+ res = VG_(ksigaction)( VKI_SIGILL, &sigill_new, &sigill_saved );
+ sk_assert(res == 0);
+
+ /* Trap for illegal instruction, in case it's a really old processor that
+ * doesn't support CPUID. */
+ if (__builtin_setjmp(cpuid_jmpbuf) == 0) {
+ VG_(cpuid)(0, &level, (int*)&vendor_id[0],
+ (int*)&vendor_id[8], (int*)&vendor_id[4]);
+ vendor_id[12] = '\0';
+
+ /* Restore old SIGILL handler */
+ res = VG_(ksigaction)( VKI_SIGILL, &sigill_saved, NULL );
+ sk_assert(res == 0);
+
+ } else {
+ VG_(message)(Vg_DebugMsg, "CPUID instruction not supported");
+
+ /* Restore old SIGILL handler */
+ res = VG_(ksigaction)( VKI_SIGILL, &sigill_saved, NULL );
+ sk_assert(res == 0);
+ return -1;
+ }
+
+ if (0 == level) {
+ VG_(message)(Vg_DebugMsg, "CPUID level is 0, early Pentium?\n");
+ return -1;
+ }
+
+ /* Only handling Intel and AMD chips... no Cyrix, Transmeta, etc */
+ if (0 == VG_(strcmp)(vendor_id, "GenuineIntel")) {
+ ret = Intel_cache_info(level, I1c, D1c, L2c);
+
+ } else if (0 == VG_(strcmp)(vendor_id, "AuthenticAMD")) {
+ ret = AMD_cache_info(I1c, D1c, L2c);
+
+ } else if (0 == VG_(strcmp)(vendor_id, "CentaurHauls")) {
+ /* Total kludge. Pretend to be a VIA Nehemiah. */
+ D1c->size = 64;
+ D1c->assoc = 16;
+ D1c->line_size = 16;
+ I1c->size = 64;
+ I1c->assoc = 4;
+ I1c->line_size = 16;
+ L2c->size = 64;
+ L2c->assoc = 16;
+ L2c->line_size = 16;
+ ret = 0;
+
+ } else {
+ VG_(message)(Vg_DebugMsg, "CPU vendor ID not recognised (%s)",
+ vendor_id);
+ return -1;
+ }
+
+ /* Successful! Convert sizes from KB to bytes */
+ I1c->size *= 1024;
+ D1c->size *= 1024;
+ L2c->size *= 1024;
+
+ return ret;
+}
+
+
+void VGA_(configure_caches)(cache_t* I1c, cache_t* D1c, cache_t* L2c,
+ cache_t* I1_dflt, cache_t* D1_dflt, cache_t* L2_dflt,
+ Bool all_caches_clo_defined)
+{
+ Int res;
+
+ // Set caches to default.
+ *I1_dflt = (cache_t) { 65536, 2, 64 };
+ *D1_dflt = (cache_t) { 65536, 2, 64 };
+ *L2_dflt = (cache_t) { 262144, 8, 64 };
+ *I1c = *I1_dflt;
+ *D1c = *D1_dflt;
+ *L2c = *L2_dflt;
+
+ // Then replace with any info we can get from CPUID.
+ res = get_caches_from_CPUID(I1c, D1c, L2c);
+
+ // Warn if CPUID failed and config not completely specified from cmd line.
+ if (res != 0 && !all_caches_clo_defined) {
+ VG_(message)(Vg_DebugMsg,
+ "Warning: Couldn't auto-detect cache config, using one "
+ "or more defaults ");
+ }
+}
+
+/*--------------------------------------------------------------------*/
+/*--- end ---*/
+/*--------------------------------------------------------------------*/