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fpr=35CCFB63B283D6D3AEB783944CB5F6848BBC56EE X-Developer-Signature: v=1; a=openpgp-sha256; l=13960; i=samitolvanen@google.com; h=from:subject; bh=fbwuwqk6CBs6GxSLKW1YVstmYpQxC2PKUQTmM9ZWc3Y=; b=owEB7QES/pANAwAKAUy19oSLvFbuAcsmYgBmcHk6W7swSMlMXEfHHZ4lDet9yNrknEg65M0/F kJ95lvbatGJAbMEAAEKAB0WIQQ1zPtjsoPW0663g5RMtfaEi7xW7gUCZnB5OgAKCRBMtfaEi7xW 7o2RDACryqWKB0s4mkpnv7sidxnwYF/2IZ7pM9CR+UnhHvbTmVWJWEz/vxUw7ewA/CVqHM7yEfH 0xju2BYdvgQyJCw7Z+QbKtQXw6wfzJZVmjZQfDR2g19sv4OAxVjB8uY6QiC6veeyHbA9zeELh/n SNLvcrgEjjkEjGuyFETAomolBAGnPfbm8wBsApAPs5qUiYBslRZ6+AVeNlxqD2tetw88zxn0KGC H1ihgqDx452proTcjdmQZ6YRIfOan6lpNx4sQ2o1hnaYkDNVe2Yw2YFeJJFqSml3zfC1CK5elma RZaZ45QdCNFGuYJfmuolIhZiY1OH5Ur+oP7yF13xWAIphvOYSBAfwtuvu4RdN+iI8qK/FVzxkOn QCA9xh29HUjiH+Ef2DncDSwbeB47+W9PLR3Aw9EwVRkMvZirfYig7pVP6yZcpC4JqvAlSiOPdgD 1GMr38SUX0Nsn3ojyyAsUWkrgzcbp1pgsvsbzHZbdYTJRcEzQE4rrLVV3CR6tiESWI2co= X-Mailer: git-send-email 2.45.2.627.g7a2c4fd464-goog Message-ID: <20240617175818.58219-20-samitolvanen@google.com> Subject: [PATCH 03/15] gendwarfksyms: Add CRC calculation From: Sami Tolvanen To: Masahiro Yamada , Luis Chamberlain , Miguel Ojeda , Greg Kroah-Hartman Cc: Matthew Maurer , Alex Gaynor , Wedson Almeida Filho , Gary Guo , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-modules@vger.kernel.org, rust-for-linux@vger.kernel.org, Sami Tolvanen Add a basic CRC32 implementation adapted from genksyms, and produce matching output from type strings. Example usage: $ nm -p --defined-only rust/alloc.o | \ awk '/ (T|R|D) / {printf "%s %s\n",$1, $3}' | \ tools/gendwarfksyms/gendwarfksyms rust/alloc.o Output: #SYMVER _RNvNvMs_NtCscg2doA4GLaz_5alloc3vecINtB6_3VecppE11swap_remove13assert_failed 0x985f94dd #SYMVER _RNvXs1_NtCscg2doA4GLaz_5alloc11collectionsNtB5_15TryReserveErrorNtNtCs5QSdWC790r4_4core3fmt7Display3fmt 0x985f94dd #SYMVER _RNvNvMs_NtCscg2doA4GLaz_5alloc3vecINtB6_3VecppE6remove13assert_failed 0x985f94dd ... Note that type strings are not yet expanded, so the CRCs can only distinguish between functions and variables for now. Signed-off-by: Sami Tolvanen --- tools/gendwarfksyms/Build | 1 + tools/gendwarfksyms/crc32.c | 69 ++++++++++++++++++++++++++++ tools/gendwarfksyms/crc32.h | 34 ++++++++++++++ tools/gendwarfksyms/gendwarfksyms.c | 1 + tools/gendwarfksyms/gendwarfksyms.h | 6 +++ tools/gendwarfksyms/symbols.c | 71 +++++++++++++++++++++++++++-- tools/gendwarfksyms/types.c | 19 ++++++-- 7 files changed, 194 insertions(+), 7 deletions(-) create mode 100644 tools/gendwarfksyms/crc32.c create mode 100644 tools/gendwarfksyms/crc32.h diff --git a/tools/gendwarfksyms/Build b/tools/gendwarfksyms/Build index a83c59bfef8b..518642c9b9de 100644 --- a/tools/gendwarfksyms/Build +++ b/tools/gendwarfksyms/Build @@ -1,3 +1,4 @@ gendwarfksyms-y += gendwarfksyms.o +gendwarfksyms-y += crc32.o gendwarfksyms-y += symbols.o gendwarfksyms-y += types.o diff --git a/tools/gendwarfksyms/crc32.c b/tools/gendwarfksyms/crc32.c new file mode 100644 index 000000000000..23b328cd74f2 --- /dev/null +++ b/tools/gendwarfksyms/crc32.c @@ -0,0 +1,69 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Based on scripts/genksyms/genksyms.c, which has the following + * notice: + * + * Generate kernel symbol version hashes. + * Copyright 1996, 1997 Linux International. + * + * New implementation contributed by Richard Henderson + * Based on original work by Bjorn Ekwall + * + * This file was part of the Linux modutils 2.4.22: moved back into the + * kernel sources by Rusty Russell/Kai Germaschewski. + */ + +const unsigned int crctab32[] = { + 0x00000000U, 0x77073096U, 0xee0e612cU, 0x990951baU, 0x076dc419U, + 0x706af48fU, 0xe963a535U, 0x9e6495a3U, 0x0edb8832U, 0x79dcb8a4U, + 0xe0d5e91eU, 0x97d2d988U, 0x09b64c2bU, 0x7eb17cbdU, 0xe7b82d07U, + 0x90bf1d91U, 0x1db71064U, 0x6ab020f2U, 0xf3b97148U, 0x84be41deU, + 0x1adad47dU, 0x6ddde4ebU, 0xf4d4b551U, 0x83d385c7U, 0x136c9856U, + 0x646ba8c0U, 0xfd62f97aU, 0x8a65c9ecU, 0x14015c4fU, 0x63066cd9U, + 0xfa0f3d63U, 0x8d080df5U, 0x3b6e20c8U, 0x4c69105eU, 0xd56041e4U, + 0xa2677172U, 0x3c03e4d1U, 0x4b04d447U, 0xd20d85fdU, 0xa50ab56bU, + 0x35b5a8faU, 0x42b2986cU, 0xdbbbc9d6U, 0xacbcf940U, 0x32d86ce3U, + 0x45df5c75U, 0xdcd60dcfU, 0xabd13d59U, 0x26d930acU, 0x51de003aU, + 0xc8d75180U, 0xbfd06116U, 0x21b4f4b5U, 0x56b3c423U, 0xcfba9599U, + 0xb8bda50fU, 0x2802b89eU, 0x5f058808U, 0xc60cd9b2U, 0xb10be924U, + 0x2f6f7c87U, 0x58684c11U, 0xc1611dabU, 0xb6662d3dU, 0x76dc4190U, + 0x01db7106U, 0x98d220bcU, 0xefd5102aU, 0x71b18589U, 0x06b6b51fU, + 0x9fbfe4a5U, 0xe8b8d433U, 0x7807c9a2U, 0x0f00f934U, 0x9609a88eU, + 0xe10e9818U, 0x7f6a0dbbU, 0x086d3d2dU, 0x91646c97U, 0xe6635c01U, + 0x6b6b51f4U, 0x1c6c6162U, 0x856530d8U, 0xf262004eU, 0x6c0695edU, + 0x1b01a57bU, 0x8208f4c1U, 0xf50fc457U, 0x65b0d9c6U, 0x12b7e950U, + 0x8bbeb8eaU, 0xfcb9887cU, 0x62dd1ddfU, 0x15da2d49U, 0x8cd37cf3U, + 0xfbd44c65U, 0x4db26158U, 0x3ab551ceU, 0xa3bc0074U, 0xd4bb30e2U, + 0x4adfa541U, 0x3dd895d7U, 0xa4d1c46dU, 0xd3d6f4fbU, 0x4369e96aU, + 0x346ed9fcU, 0xad678846U, 0xda60b8d0U, 0x44042d73U, 0x33031de5U, + 0xaa0a4c5fU, 0xdd0d7cc9U, 0x5005713cU, 0x270241aaU, 0xbe0b1010U, + 0xc90c2086U, 0x5768b525U, 0x206f85b3U, 0xb966d409U, 0xce61e49fU, + 0x5edef90eU, 0x29d9c998U, 0xb0d09822U, 0xc7d7a8b4U, 0x59b33d17U, + 0x2eb40d81U, 0xb7bd5c3bU, 0xc0ba6cadU, 0xedb88320U, 0x9abfb3b6U, + 0x03b6e20cU, 0x74b1d29aU, 0xead54739U, 0x9dd277afU, 0x04db2615U, + 0x73dc1683U, 0xe3630b12U, 0x94643b84U, 0x0d6d6a3eU, 0x7a6a5aa8U, + 0xe40ecf0bU, 0x9309ff9dU, 0x0a00ae27U, 0x7d079eb1U, 0xf00f9344U, + 0x8708a3d2U, 0x1e01f268U, 0x6906c2feU, 0xf762575dU, 0x806567cbU, + 0x196c3671U, 0x6e6b06e7U, 0xfed41b76U, 0x89d32be0U, 0x10da7a5aU, + 0x67dd4accU, 0xf9b9df6fU, 0x8ebeeff9U, 0x17b7be43U, 0x60b08ed5U, + 0xd6d6a3e8U, 0xa1d1937eU, 0x38d8c2c4U, 0x4fdff252U, 0xd1bb67f1U, + 0xa6bc5767U, 0x3fb506ddU, 0x48b2364bU, 0xd80d2bdaU, 0xaf0a1b4cU, + 0x36034af6U, 0x41047a60U, 0xdf60efc3U, 0xa867df55U, 0x316e8eefU, + 0x4669be79U, 0xcb61b38cU, 0xbc66831aU, 0x256fd2a0U, 0x5268e236U, + 0xcc0c7795U, 0xbb0b4703U, 0x220216b9U, 0x5505262fU, 0xc5ba3bbeU, + 0xb2bd0b28U, 0x2bb45a92U, 0x5cb36a04U, 0xc2d7ffa7U, 0xb5d0cf31U, + 0x2cd99e8bU, 0x5bdeae1dU, 0x9b64c2b0U, 0xec63f226U, 0x756aa39cU, + 0x026d930aU, 0x9c0906a9U, 0xeb0e363fU, 0x72076785U, 0x05005713U, + 0x95bf4a82U, 0xe2b87a14U, 0x7bb12baeU, 0x0cb61b38U, 0x92d28e9bU, + 0xe5d5be0dU, 0x7cdcefb7U, 0x0bdbdf21U, 0x86d3d2d4U, 0xf1d4e242U, + 0x68ddb3f8U, 0x1fda836eU, 0x81be16cdU, 0xf6b9265bU, 0x6fb077e1U, + 0x18b74777U, 0x88085ae6U, 0xff0f6a70U, 0x66063bcaU, 0x11010b5cU, + 0x8f659effU, 0xf862ae69U, 0x616bffd3U, 0x166ccf45U, 0xa00ae278U, + 0xd70dd2eeU, 0x4e048354U, 0x3903b3c2U, 0xa7672661U, 0xd06016f7U, + 0x4969474dU, 0x3e6e77dbU, 0xaed16a4aU, 0xd9d65adcU, 0x40df0b66U, + 0x37d83bf0U, 0xa9bcae53U, 0xdebb9ec5U, 0x47b2cf7fU, 0x30b5ffe9U, + 0xbdbdf21cU, 0xcabac28aU, 0x53b39330U, 0x24b4a3a6U, 0xbad03605U, + 0xcdd70693U, 0x54de5729U, 0x23d967bfU, 0xb3667a2eU, 0xc4614ab8U, + 0x5d681b02U, 0x2a6f2b94U, 0xb40bbe37U, 0xc30c8ea1U, 0x5a05df1bU, + 0x2d02ef8dU +}; diff --git a/tools/gendwarfksyms/crc32.h b/tools/gendwarfksyms/crc32.h new file mode 100644 index 000000000000..89e4454b2a70 --- /dev/null +++ b/tools/gendwarfksyms/crc32.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Based on scripts/genksyms/genksyms.c, which has the following + * notice: + * + * Generate kernel symbol version hashes. + * Copyright 1996, 1997 Linux International. + * + * New implementation contributed by Richard Henderson + * Based on original work by Bjorn Ekwall + * + * This file was part of the Linux modutils 2.4.22: moved back into the + * kernel sources by Rusty Russell/Kai Germaschewski. + */ + +#ifndef __CRC32_H +#define __CRC32_H + +extern const unsigned int crctab32[]; + +static inline unsigned long partial_crc32_one(unsigned char c, + unsigned long crc) +{ + return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8); +} + +static inline unsigned long partial_crc32(const char *s, unsigned long crc) +{ + while (*s) + crc = partial_crc32_one(*s++, crc); + return crc; +} + +#endif /* __CRC32_H */ diff --git a/tools/gendwarfksyms/gendwarfksyms.c b/tools/gendwarfksyms/gendwarfksyms.c index 4a1bd9239182..7938b7440674 100644 --- a/tools/gendwarfksyms/gendwarfksyms.c +++ b/tools/gendwarfksyms/gendwarfksyms.c @@ -125,6 +125,7 @@ int main(int argc, const char **argv) } dwfl_end(dwfl); + symbol_print_versions(); return 0; } diff --git a/tools/gendwarfksyms/gendwarfksyms.h b/tools/gendwarfksyms/gendwarfksyms.h index b77855cc94a7..7440f1c73500 100644 --- a/tools/gendwarfksyms/gendwarfksyms.h +++ b/tools/gendwarfksyms/gendwarfksyms.h @@ -52,17 +52,22 @@ extern bool debug; /* * symbols.c */ +enum symbol_state { UNPROCESSED, PROCESSED_ADDR, PROCESSED_NAME }; /* Exported symbol -- matching either the name or the address */ struct symbol { const char *name; uintptr_t addr; + enum symbol_state state; + unsigned long crc; struct hlist_node addr_hash; struct hlist_node name_hash; }; +extern int symbol_set_crc(struct symbol *sym, unsigned long crc); extern int symbol_read_list(FILE *file); extern struct symbol *symbol_get(uintptr_t addr, const char *name); +extern void symbol_print_versions(void); /* * types.c @@ -73,6 +78,7 @@ struct state { Dwarf *dbg; struct symbol *sym; Dwarf_Die origin; + unsigned long crc; }; typedef int (*die_callback_t)(struct state *state, Dwarf_Die *die); diff --git a/tools/gendwarfksyms/symbols.c b/tools/gendwarfksyms/symbols.c index 2cae61bcede7..71029635fc83 100644 --- a/tools/gendwarfksyms/symbols.c +++ b/tools/gendwarfksyms/symbols.c @@ -18,7 +18,8 @@ static u32 name_hash(const char *name) } /* symbol_for_each callback -- return true to stop, false to continue */ -typedef bool (*symbol_callback_t)(struct symbol *, void *arg); +typedef bool (*symbol_callback_t)(struct symbol *, enum symbol_state type, + void *arg); static bool for_each_addr(uintptr_t addr, symbol_callback_t func, void *data) { @@ -30,7 +31,7 @@ static bool for_each_addr(uintptr_t addr, symbol_callback_t func, void *data) hash_for_each_possible(symbol_addrs, sym, addr_hash, addr) { if (sym->addr == addr) { - if (func(sym, data)) + if (func(sym, PROCESSED_ADDR, data)) return true; found = true; } @@ -49,7 +50,7 @@ static bool for_each_name(const char *name, symbol_callback_t func, void *data) hash_for_each_possible(symbol_names, sym, name_hash, name_hash(name)) { if (!strcmp(sym->name, name)) { - if (func(sym, data)) + if (func(sym, PROCESSED_NAME, data)) return true; found = true; } @@ -71,6 +72,45 @@ static bool for_each(uintptr_t addr, const char *name, symbol_callback_t func, return found; } +static bool set_crc(struct symbol *sym, enum symbol_state type, void *data) +{ + unsigned long *crc = data; + + /* Prefer an address match if found, otherwise match by name. */ + if (type == PROCESSED_ADDR) { + if (sym->state == PROCESSED_ADDR) { + warn("symbol %s (@ %lx) already matched by address (crc %lx vs. %lx)", + sym->name, sym->addr, sym->crc, *crc); + return false; + } + if (sym->state == PROCESSED_NAME && sym->crc != *crc) + debug("symbol %s (@ %lx) overriding name match (crc %lx vs. %lx)", + sym->name, sym->addr, sym->crc, *crc); + } else if (type == PROCESSED_NAME) { + if (sym->state == PROCESSED_ADDR) { + if (sym->crc != *crc) + debug("symbol %s (@ %lx) ignoring name match (crc %lx vs. %lx)", + sym->name, sym->addr, sym->crc, *crc); + return false; + } + if (sym->state == PROCESSED_NAME) { + warn("symbol %s (@ %lx) already matched by name (crc %lx vs. %lx)", + sym->name, sym->addr, sym->crc, *crc); + return false; + } + } + + sym->state = type; + sym->crc = *crc; + + return false; /* Continue */ +} + +int symbol_set_crc(struct symbol *sym, unsigned long crc) +{ + return for_each(sym->addr, sym->name, set_crc, &crc) ? 0 : -1; +} + int symbol_read_list(FILE *file) { struct symbol *sym; @@ -99,6 +139,8 @@ int symbol_read_list(FILE *file) sym->addr = (uintptr_t)addr; sym->name = name; + sym->state = UNPROCESSED; + sym->crc = 0; name = NULL; hash_add(symbol_addrs, &sym->addr_hash, sym->addr); @@ -111,7 +153,7 @@ int symbol_read_list(FILE *file) return 0; } -static bool return_symbol(struct symbol *sym, void *arg) +static bool return_symbol(struct symbol *sym, enum symbol_state type, void *arg) { struct symbol **res = (struct symbol **)arg; @@ -128,3 +170,24 @@ struct symbol *symbol_get(uintptr_t addr, const char *name) return NULL; } + +void symbol_print_versions(void) +{ + struct hlist_node *tmp; + struct symbol *sym; + int i; + + hash_for_each_safe(symbol_addrs, i, tmp, sym, addr_hash) { + if (sym->state == UNPROCESSED) + warn("no information for symbol %s (@ %lx)", sym->name, + sym->addr); + + printf("#SYMVER %s 0x%08lx\n", sym->name, sym->crc); + + free((void *)sym->name); + free(sym); + } + + hash_init(symbol_addrs); + hash_init(symbol_names); +} diff --git a/tools/gendwarfksyms/types.c b/tools/gendwarfksyms/types.c index f1ce7bfcf510..47ae967d42ee 100644 --- a/tools/gendwarfksyms/types.c +++ b/tools/gendwarfksyms/types.c @@ -4,6 +4,7 @@ */ #include "gendwarfksyms.h" +#include "crc32.h" #define DEFINE_GET_ATTR(attr, type) \ static bool get_##attr##_attr(Dwarf_Die *die, unsigned int id, \ @@ -68,7 +69,7 @@ static Dwarf_Die *get_exported(struct state *state, Dwarf_Die *die) } /* - * Type string processing + * Type string and CRC processing */ static int process(struct state *state, const char *s) { @@ -77,6 +78,7 @@ static int process(struct state *state, const char *s) if (debug) fputs(s, stderr); + state->crc = partial_crc32(s, state->crc); return 0; } @@ -101,6 +103,11 @@ int process_die_container(struct state *state, Dwarf_Die *die, return 0; } +static void state_init(struct state *state) +{ + state->crc = 0xffffffff; +} + /* * Exported symbol processing */ @@ -130,17 +137,23 @@ static int process_exported_symbols(struct state *state, Dwarf_Die *die) case DW_TAG_subprogram: case DW_TAG_variable: die = get_exported(state, die); - if (!die || !state->sym) + if (!die || !state->sym || state->sym->state != UNPROCESSED) return 0; + /* + * For each exported symbol, compute a CRC of the expanded type + * description. + */ debug("%s (@ %lx)", state->sym->name, state->sym->addr); + state_init(state); if (tag == DW_TAG_subprogram) check(process_subprogram(state, die)); else check(process_variable(state, die)); - return 0; + return check( + symbol_set_crc(state->sym, state->crc ^ 0xffffffff)); default: return 0; }