| /*--------------------------------------------------------------------*/ |
| /*--- Cachegrind: cache configuration. ---*/ |
| /*--- The architecture specific void VG_(configure_caches) are ---*/ |
| /*--- located in the cg-<architecture>.c files. ---*/ |
| /*--- cg-arch.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Cachegrind, a Valgrind tool for cache |
| profiling programs. |
| |
| Copyright (C) 2011-2011 Nicholas Nethercote |
| njn@valgrind.org |
| |
| 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 "pub_tool_basics.h" |
| #include "pub_tool_libcassert.h" |
| #include "pub_tool_libcbase.h" |
| #include "pub_tool_libcprint.h" |
| #include "pub_tool_options.h" |
| |
| #include "cg_arch.h" |
| |
| // Checks cache config is ok. Returns NULL if ok, or a pointer to an error |
| // string otherwise. |
| static Char* check_cache(cache_t* cache) |
| { |
| // Simulator requires set count to be a power of two. |
| if ((cache->size % (cache->line_size * cache->assoc) != 0) || |
| (-1 == VG_(log2)(cache->size/cache->line_size/cache->assoc))) |
| { |
| return "Cache set count is not a power of two.\n"; |
| } |
| |
| // Simulator requires line size to be a power of two. |
| if (-1 == VG_(log2)(cache->line_size)) { |
| return "Cache line size is not a power of two.\n"; |
| } |
| |
| // Then check line size >= 16 -- any smaller and a single instruction could |
| // straddle three cache lines, which breaks a simulation assertion and is |
| // stupid anyway. |
| if (cache->line_size < MIN_LINE_SIZE) { |
| return "Cache line size is too small.\n"; |
| } |
| |
| /* Then check cache size > line size (causes seg faults if not). */ |
| if (cache->size <= cache->line_size) { |
| return "Cache size <= line size.\n"; |
| } |
| |
| /* Then check assoc <= (size / line size) (seg faults otherwise). */ |
| if (cache->assoc > (cache->size / cache->line_size)) { |
| return "Cache associativity > (size / line size).\n"; |
| } |
| |
| return NULL; |
| } |
| |
| |
| static void parse_cache_opt ( cache_t* cache, Char* opt, Char* optval ) |
| { |
| Long i1, i2, i3; |
| Char* endptr; |
| Char* checkRes; |
| |
| // Option argument looks like "65536,2,64". Extract them. |
| i1 = VG_(strtoll10)(optval, &endptr); if (*endptr != ',') goto bad; |
| i2 = VG_(strtoll10)(endptr+1, &endptr); if (*endptr != ',') goto bad; |
| i3 = VG_(strtoll10)(endptr+1, &endptr); if (*endptr != '\0') goto bad; |
| |
| // Check for overflow. |
| cache->size = (Int)i1; |
| cache->assoc = (Int)i2; |
| cache->line_size = (Int)i3; |
| if (cache->size != i1) goto overflow; |
| if (cache->assoc != i2) goto overflow; |
| if (cache->line_size != i3) goto overflow; |
| |
| checkRes = check_cache(cache); |
| if (checkRes) { |
| VG_(fmsg)("%s", checkRes); |
| goto bad; |
| } |
| |
| return; |
| |
| bad: |
| VG_(fmsg_bad_option)(opt, ""); |
| |
| overflow: |
| VG_(fmsg_bad_option)(opt, |
| "One of the cache parameters was too large and overflowed.\n"); |
| } |
| |
| |
| Bool VG_(str_clo_cache_opt)(Char *arg, |
| cache_t* clo_I1c, |
| cache_t* clo_D1c, |
| cache_t* clo_LLc) |
| { |
| Char* tmp_str; |
| |
| if VG_STR_CLO(arg, "--I1", tmp_str) { |
| parse_cache_opt(clo_I1c, arg, tmp_str); |
| return True; |
| } else if VG_STR_CLO(arg, "--D1", tmp_str) { |
| parse_cache_opt(clo_D1c, arg, tmp_str); |
| return True; |
| } else if (VG_STR_CLO(arg, "--L2", tmp_str) || // for backwards compatibility |
| VG_STR_CLO(arg, "--LL", tmp_str)) { |
| parse_cache_opt(clo_LLc, arg, tmp_str); |
| return True; |
| } else |
| return False; |
| } |
| |
| static void umsg_cache_img(Char* desc, cache_t* c) |
| { |
| VG_(umsg)(" %s: %'d B, %d-way, %d B lines\n", desc, |
| c->size, c->assoc, c->line_size); |
| } |
| |
| // Verifies if c is a valid cache. |
| // An invalid value causes an assert, unless clo_redefined is True. |
| static void check_cache_or_override(Char* desc, cache_t* c, Bool clo_redefined) |
| { |
| Char* checkRes; |
| |
| checkRes = check_cache(c); |
| if (checkRes) { |
| VG_(umsg)("Auto-detected %s cache configuration not supported: %s", |
| desc, checkRes); |
| umsg_cache_img(desc, c); |
| if (!clo_redefined) { |
| VG_(umsg)("As it probably should be supported, please report a bug!\n"); |
| VG_(umsg)("Bypass this message by using option --%s=...\n", desc); |
| tl_assert(0); |
| } |
| } |
| } |
| |
| void VG_(post_clo_init_configure_caches)(cache_t* I1c, |
| cache_t* D1c, |
| cache_t* LLc, |
| cache_t* clo_I1c, |
| cache_t* clo_D1c, |
| cache_t* clo_LLc) |
| { |
| #define DEFINED(L) (-1 != L->size || -1 != L->assoc || -1 != L->line_size) |
| |
| // Count how many were defined on the command line. |
| Bool all_caches_clo_defined = |
| (DEFINED(clo_I1c) && |
| DEFINED(clo_D1c) && |
| DEFINED(clo_LLc)); |
| |
| // Set the cache config (using auto-detection, if supported by the |
| // architecture). |
| VG_(configure_caches)( I1c, D1c, LLc, all_caches_clo_defined ); |
| |
| // Check the default/auto-detected values. |
| // Allow the user to override invalid auto-detected caches |
| // with command line. |
| check_cache_or_override ("I1", I1c, DEFINED(clo_I1c)); |
| check_cache_or_override ("D1", D1c, DEFINED(clo_D1c)); |
| check_cache_or_override ("LL", LLc, DEFINED(clo_LLc)); |
| |
| // Then replace with any defined on the command line. (Already checked in |
| // VG(parse_clo_cache_opt)().) |
| if (DEFINED(clo_I1c)) { *I1c = *clo_I1c; } |
| if (DEFINED(clo_D1c)) { *D1c = *clo_D1c; } |
| if (DEFINED(clo_LLc)) { *LLc = *clo_LLc; } |
| |
| if (VG_(clo_verbosity) >= 2) { |
| VG_(umsg)("Cache configuration used:\n"); |
| umsg_cache_img ("I1", I1c); |
| umsg_cache_img ("D1", D1c); |
| umsg_cache_img ("LL", LLc); |
| } |
| #undef DEFINED |
| } |
| |
| void VG_(print_cache_clo_opts)() |
| { |
| VG_(printf)( |
| " --I1=<size>,<assoc>,<line_size> set I1 cache manually\n" |
| " --D1=<size>,<assoc>,<line_size> set D1 cache manually\n" |
| " --LL=<size>,<assoc>,<line_size> set LL cache manually\n" |
| ); |
| } |
