diff options
Diffstat (limited to 'elf/sprof.c')
| -rw-r--r-- | elf/sprof.c | 937 |
1 files changed, 937 insertions, 0 deletions
diff --git a/elf/sprof.c b/elf/sprof.c new file mode 100644 index 0000000000..0d50806126 --- /dev/null +++ b/elf/sprof.c @@ -0,0 +1,937 @@ +/* Read and display shared object profiling data. + Copyright (C) 1997, 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <argp.h> +#include <dlfcn.h> +#include <elf.h> +#include <endian.h> +#include <error.h> +#include <fcntl.h> +#include <inttypes.h> +#include <libintl.h> +#include <link.h> +#include <locale.h> +#include <obstack.h> +#include <search.h> +#include <stab.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/gmon.h> +#include <sys/gmon_out.h> +#include <sys/mman.h> +#include <sys/param.h> +#include <sys/stat.h> + +/* Undefine the following line line in the production version. */ +/* #define _NDEBUG 1 */ +#include <assert.h> + +/* Get libc version number. */ +#include "../version.h" + +#define PACKAGE _libc_intl_domainname + + +#include <endian.h> +#if BYTE_ORDER == BIG_ENDIAN +#define byteorder ELFDATA2MSB +#define byteorder_name "big-endian" +#elif BYTE_ORDER == LITTLE_ENDIAN +#define byteorder ELFDATA2LSB +#define byteorder_name "little-endian" +#else +#error "Unknown BYTE_ORDER " BYTE_ORDER +#define byteorder ELFDATANONE +#endif + + +extern int __profile_frequency __P ((void)); + +/* Name and version of program. */ +static void print_version (FILE *stream, struct argp_state *state); +void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version; + +#define OPT_COUNT_TOTAL 1 +#define OPT_TEST 2 + +/* Definitions of arguments for argp functions. */ +static const struct argp_option options[] = +{ + { NULL, 0, NULL, 0, N_("Output selection:") }, + { "count-total", OPT_COUNT_TOTAL, NULL, 0, + N_("print number of invocations for each function") }, + { "test", OPT_TEST, NULL, OPTION_HIDDEN, NULL }, + { NULL, 0, NULL, 0, NULL } +}; + +/* Short description of program. */ +static const char doc[] = N_("Read and display shared object profiling data"); + +/* Strings for arguments in help texts. */ +static const char args_doc[] = N_("SHOBJ [PROFDATA]"); + +/* Prototype for option handler. */ +static error_t parse_opt (int key, char *arg, struct argp_state *state); + +/* Data structure to communicate with argp functions. */ +static struct argp argp = +{ + options, parse_opt, args_doc, doc, NULL, NULL +}; + + +/* Operation modes. */ +static enum +{ + NONE = 0, + COUNT_TOTAL +} mode; + +/* If nonzero the total number of invocations of a function is emitted. */ +int count_total; + +/* Nozero for testing. */ +int do_test; + +/* Strcuture describing calls. */ +struct here_fromstruct + { + struct here_cg_arc_record volatile *here; + uint16_t link; + }; + +/* We define a special type to address the elements of the arc table. + This is basically the `gmon_cg_arc_record' format but it includes + the room for the tag and it uses real types. */ +struct here_cg_arc_record + { + uintptr_t from_pc; + uintptr_t self_pc; + uint32_t count; + } __attribute__ ((packed)); + +/* Information about the stab debugging info. This should be in a + head but it is not. */ +#define STRDXOFF (0) +#define TYPEOFF (4) +#define OTHEROFF (5) +#define DESCOFF (6) +#define VALOFF (8) +#define STABSIZE (12) + + +struct known_symbol +{ + const char *name; + uintptr_t addr; + size_t size; +}; + + +struct shobj +{ + const char *name; /* User-provided name. */ + + struct link_map *map; + const char *strtab; /* String table of shared object. */ + const char *soname; /* Soname of shared object. */ + + uintptr_t lowpc; + uintptr_t highpc; + unsigned long int kcountsize; + size_t expected_size; /* Expected size of profiling file. */ + size_t tossize; + size_t fromssize; + size_t fromlimit; + unsigned int hashfraction; + int s_scale; + + void *stab_map; + size_t stab_mapsize; + const char *stab; + size_t stab_size; + const char *stabstr; + size_t stabstr_size; + + struct obstack ob_str; + struct obstack ob_sym; +}; + + +struct profdata +{ + void *addr; + off_t size; + + char *hist; + uint16_t *kcount; + uint32_t narcs; /* Number of arcs in toset. */ + struct here_cg_arc_record *data; + uint16_t *tos; + struct here_fromstruct *froms; +}; + +/* Search tree for symbols. */ +void *symroot; +static const struct known_symbol **sortsym; +static size_t symidx; + +/* Prototypes for local functions. */ +static struct shobj *load_shobj (const char *name); +static void unload_shobj (struct shobj *shobj); +static struct profdata *load_profdata (const char *name, struct shobj *shobj); +static void unload_profdata (struct profdata *profdata); +static void count_total_ticks (struct shobj *shobj, struct profdata *profdata); +static void read_symbols (struct shobj *shobj); + + +int +main (int argc, char *argv[]) +{ + const char *shobj; + const char *profdata; + struct shobj *shobj_handle; + struct profdata *profdata_handle; + int remaining; + + setlocale (LC_ALL, ""); + + /* Initialize the message catalog. */ + textdomain (_libc_intl_domainname); + + /* Parse and process arguments. */ + argp_parse (&argp, argc, argv, 0, &remaining, NULL); + + if (argc - remaining == 0 || argc - remaining > 2) + { + /* We need exactly two non-option parameter. */ + argp_help (&argp, stdout, ARGP_HELP_SEE | ARGP_HELP_EXIT_ERR, + program_invocation_short_name); + exit (1); + } + + /* Get parameters. */ + shobj = argv[remaining]; + if (argc - remaining == 2) + profdata = argv[remaining + 1]; + else + /* No filename for the profiling data given. We will determine it + from the soname of the shobj, later. */ + profdata = NULL; + + /* First see whether we can load the shared object. */ + shobj_handle = load_shobj (shobj); + if (shobj_handle == NULL) + exit (1); + + /* We can now determine the filename for the profiling data, if + nececessary. */ + if (profdata == NULL) + { + char *newp; + + if (shobj_handle->soname == NULL) + { + unload_shobj (shobj_handle); + + error (EXIT_FAILURE, 0, _("\ +no filename for profiling data given and shared object `%s' has no soname"), + shobj); + } + + newp = (char *) alloca (strlen (shobj_handle->soname) + + sizeof ".profile"); + stpcpy (stpcpy (newp, shobj_handle->soname), ".profile"); + profdata = newp; + } + + /* Now see whether the profiling data file matches the given object. */ + profdata_handle = load_profdata (profdata, shobj_handle); + if (profdata_handle == NULL) + { + unload_shobj (shobj_handle); + + exit (1); + } + + read_symbols (shobj_handle); + + /* Do some work. */ + switch (mode) + { + case COUNT_TOTAL: + count_total_ticks (shobj_handle, profdata_handle); + break; + case NONE: + /* Do nothing. */ + break; + default: + assert (! "Internal error"); + } + + /* Free the resources. */ + unload_shobj (shobj_handle); + unload_profdata (profdata_handle); + + return 0; +} + + +/* Handle program arguments. */ +static error_t +parse_opt (int key, char *arg, struct argp_state *state) +{ + switch (key) + { + case OPT_COUNT_TOTAL: + mode = COUNT_TOTAL; + break; + case OPT_TEST: + do_test = 1; + break; + default: + return ARGP_ERR_UNKNOWN; + } + return 0; +} + + +/* Print the version information. */ +static void +print_version (FILE *stream, struct argp_state *state) +{ + fprintf (stream, "sprof (GNU %s) %s\n", PACKAGE, VERSION); + fprintf (stream, gettext ("\ +Copyright (C) %s Free Software Foundation, Inc.\n\ +This is free software; see the source for copying conditions. There is NO\n\ +warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\ +"), + "1997, 1998"); + fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper"); +} + + +/* Note that we must not use `dlopen' etc. The shobj object must not + be loaded for use. */ +static struct shobj * +load_shobj (const char *name) +{ + struct link_map *map = NULL; + struct shobj *result; + ElfW(Addr) mapstart = ~((ElfW(Addr)) 0); + ElfW(Addr) mapend = 0; + const ElfW(Phdr) *ph; + size_t textsize; + unsigned int log_hashfraction; + ElfW(Ehdr) *ehdr; + int fd; + ElfW(Shdr) *shdr; + void *ptr; + size_t pagesize = getpagesize (); + const char *shstrtab; + int idx; + ElfW(Shdr) *stab_entry; + ElfW(Shdr) *stabstr_entry; + + /* Since we use dlopen() we must be prepared to work around the sometimes + strange lookup rules for the shared objects. If we have a file foo.so + in the current directory and the user specfies foo.so on the command + line (without specifying a directory) we should load the file in the + current directory even if a normal dlopen() call would read the other + file. We do this by adding a directory portion to the name. */ + if (strchr (name, '/') == NULL) + { + char *load_name = (char *) alloca (strlen (name) + 3); + stpcpy (stpcpy (load_name, "./"), name); + + map = (struct link_map *) dlopen (load_name, RTLD_LAZY); + } + if (map == NULL) + { + map = (struct link_map *) dlopen (name, RTLD_LAZY); + if (map == NULL) + { + error (0, errno, _("failed to load shared object `%s'"), name); + return NULL; + } + } + + /* Prepare the result. */ + result = (struct shobj *) calloc (1, sizeof (struct shobj)); + if (result == NULL) + { + error (0, errno, _("cannot create internal descriptors")); + dlclose (map); + return NULL; + } + result->name = name; + result->map = map; + + /* Compute the size of the sections which contain program code. + This must match the code in dl-profile.c (_dl_start_profile). */ + for (ph = map->l_phdr; ph < &map->l_phdr[map->l_phnum]; ++ph) + if (ph->p_type == PT_LOAD && (ph->p_flags & PF_X)) + { + ElfW(Addr) start = (ph->p_vaddr & ~(_dl_pagesize - 1)); + ElfW(Addr) end = ((ph->p_vaddr + ph->p_memsz + _dl_pagesize - 1) + & ~(_dl_pagesize - 1)); + + if (start < mapstart) + mapstart = start; + if (end > mapend) + mapend = end; + } + + result->lowpc = ROUNDDOWN ((uintptr_t) (mapstart + map->l_addr), + HISTFRACTION * sizeof (HISTCOUNTER)); + result->highpc = ROUNDUP ((uintptr_t) (mapend + map->l_addr), + HISTFRACTION * sizeof (HISTCOUNTER)); + if (do_test) + printf ("load addr: %0#*" PRIxPTR "\n" + "lower bound PC: %0#*" PRIxPTR "\n" + "upper bound PC: %0#*" PRIxPTR "\n", + __ELF_NATIVE_CLASS == 32 ? 10 : 18, map->l_addr, + __ELF_NATIVE_CLASS == 32 ? 10 : 18, result->lowpc, + __ELF_NATIVE_CLASS == 32 ? 10 : 18, result->highpc); + + textsize = result->highpc - result->lowpc; + result->kcountsize = textsize / HISTFRACTION; + result->hashfraction = HASHFRACTION; + if ((HASHFRACTION & (HASHFRACTION - 1)) == 0) + /* If HASHFRACTION is a power of two, mcount can use shifting + instead of integer division. Precompute shift amount. */ + log_hashfraction = __builtin_ffs (result->hashfraction + * sizeof (struct here_fromstruct)) - 1; + else + log_hashfraction = -1; + if (do_test) + printf ("hashfraction = %d\ndivider = %d\n", + result->hashfraction, + result->hashfraction * sizeof (struct here_fromstruct)); + result->tossize = textsize / HASHFRACTION; + result->fromlimit = textsize * ARCDENSITY / 100; + if (result->fromlimit < MINARCS) + result->fromlimit = MINARCS; + if (result->fromlimit > MAXARCS) + result->fromlimit = MAXARCS; + result->fromssize = result->fromlimit * sizeof (struct here_fromstruct); + + result->expected_size = (sizeof (struct gmon_hdr) + + 4 + sizeof (struct gmon_hist_hdr) + + result->kcountsize + + 4 + 4 + + (result->fromssize + * sizeof (struct here_cg_arc_record))); + + if (do_test) + { +#define SCALE_1_TO_1 0x10000L + + printf ("expected size: %Zd\n", result->expected_size); + + if (result->kcountsize < result->highpc - result->lowpc) + { + size_t range = result->highpc - result->lowpc; + size_t quot = range / result->kcountsize; + + if (quot >= SCALE_1_TO_1) + result->s_scale = 1; + else if (quot >= SCALE_1_TO_1 / 256) + result->s_scale = SCALE_1_TO_1 / quot; + else if (range > ULONG_MAX / 256) + result->s_scale = ((SCALE_1_TO_1 * 256) + / (range / (result->kcountsize / 256))); + else + result->s_scale = ((SCALE_1_TO_1 * 256) + / ((range * 256) / result->kcountsize)); + } + else + result->s_scale = SCALE_1_TO_1; + + printf ("s_scale: %d\n", result->s_scale); + } + + /* Determine the string table. */ + if (map->l_info[DT_STRTAB] == NULL) + result->strtab = NULL; + else + result->strtab = (const char *) (map->l_addr + + map->l_info[DT_STRTAB]->d_un.d_ptr); + if (do_test) + printf ("string table: %p\n", result->strtab); + + /* Determine the soname. */ + if (map->l_info[DT_SONAME] == NULL) + result->soname = NULL; + else + result->soname = result->strtab + map->l_info[DT_SONAME]->d_un.d_val; + if (do_test) + printf ("soname: %s\n", result->soname); + + /* Now the hard part, we have to load the debugging data. For now + we support stabs only. + + First load the section header table. */ + ehdr = (ElfW(Ehdr) *) map->l_addr; + + /* Make sure we are on the right party. */ + if (ehdr->e_shentsize != sizeof (ElfW(Shdr))) + abort (); + + /* And we need the shared object file descriptor again. */ + fd = open (map->l_name, O_RDONLY); + if (fd == -1) + /* Dooh, this really shouldn't happen. We know the file is available. */ + error (EXIT_FAILURE, errno, _("Reopening shared object `%s' failed")); + + /* Now map the section header. */ + ptr = mmap (NULL, (ehdr->e_phnum * sizeof (ElfW(Shdr)) + + (ehdr->e_shoff & (pagesize - 1))), PROT_READ, + MAP_SHARED|MAP_FILE, fd, ehdr->e_shoff & ~(pagesize - 1)); + if (ptr == MAP_FAILED) + error (EXIT_FAILURE, errno, _("mapping of section headers failed")); + shdr = (ElfW(Shdr) *) ((char *) ptr + (ehdr->e_shoff & (pagesize - 1))); + + /* Get the section header string table. */ + ptr = mmap (NULL, (shdr[ehdr->e_shstrndx].sh_size + + (shdr[ehdr->e_shstrndx].sh_offset & (pagesize - 1))), + PROT_READ, MAP_SHARED|MAP_FILE, fd, + shdr[ehdr->e_shstrndx].sh_offset & ~(pagesize - 1)); + if (ptr == MAP_FAILED) + error (EXIT_FAILURE, errno, + _("mapping of section header string table failed")); + shstrtab = ((const char *) ptr + + (shdr[ehdr->e_shstrndx].sh_offset & (pagesize - 1))); + + /* Search for the ".stab" and ".stabstr" section (and ".rel.stab" ?). */ + stab_entry = NULL; + stabstr_entry = NULL; + for (idx = 0; idx < ehdr->e_shnum; ++idx) + /* We only have to look for sections which are not loaded. */ + if (shdr[idx].sh_addr == 0) + { + if (strcmp (shstrtab + shdr[idx].sh_name, ".stab") == 0) + stab_entry = &shdr[idx]; + else if (strcmp (shstrtab + shdr[idx].sh_name, ".stabstr") == 0) + stabstr_entry = &shdr[idx]; + } + + /* We don't need the sectin header string table anymore. */ + munmap (ptr, (shdr[ehdr->e_shstrndx].sh_size + + (shdr[ehdr->e_shstrndx].sh_offset & (pagesize - 1)))); + + if (stab_entry == NULL || stabstr_entry == NULL) + { + fprintf (stderr, _("\ +*** The file `%s' is stripped: no detailed analysis possible\n"), + name); + result->stab = NULL; + result->stabstr = NULL; + } + else + { + if (stab_entry->sh_offset + stab_entry->sh_size + != stabstr_entry->sh_offset) + abort (); + if (stab_entry->sh_size % STABSIZE != 0) + abort (); + + result->stab_map = mmap (NULL, (stab_entry->sh_size + + stabstr_entry->sh_size + + (stab_entry->sh_offset + & (pagesize - 1))), + PROT_READ, MAP_SHARED|MAP_FILE, fd, + stab_entry->sh_offset & ~(pagesize - 1)); + if (result->stab_map == NULL) + error (EXIT_FAILURE, errno, _("failed to load stab data:")); + + result->stab = ((const char *) result->stab_map + + (stab_entry->sh_offset & (pagesize - 1))); + result->stab_size = stab_entry->sh_size; + result->stabstr = result->stab + stab_entry->sh_size; + result->stabstr_size = stabstr_entry->sh_size; + result->stab_mapsize = (stab_entry->sh_size + stabstr_entry->sh_size + + (stab_entry->sh_offset & (pagesize - 1))); + } + + /* Now we also don't need the sectio header table anymore. */ + munmap ((char *) shdr - (ehdr->e_shoff & (pagesize - 1)), + (ehdr->e_phnum * sizeof (ElfW(Shdr)) + + (ehdr->e_shoff & (pagesize - 1)))); + + /* Free the descriptor for the shared object. */ + close (fd); + + return result; +} + + +static void +unload_shobj (struct shobj *shobj) +{ + munmap (shobj->stab_map, shobj->stab_mapsize); + dlclose (shobj->map); +} + + +static struct profdata * +load_profdata (const char *name, struct shobj *shobj) +{ + struct profdata *result; + int fd; + struct stat st; + void *addr; + struct gmon_hdr gmon_hdr; + struct gmon_hist_hdr hist_hdr; + uint32_t *narcsp; + size_t fromlimit; + struct here_cg_arc_record *data; + struct here_fromstruct *froms; + uint16_t *tos; + size_t fromidx; + size_t idx; + + fd = open (name, O_RDONLY); + if (fd == -1) + { + char *ext_name; + + if (errno != ENOENT || strchr (name, '/') != NULL) + /* The file exists but we are not allowed to read it or the + file does not exist and the name includes a path + specification.. */ + return NULL; + + /* A file with the given name does not exist in the current + directory, try it in the default location where the profiling + files are created. */ + ext_name = (char *) alloca (strlen (name) + sizeof "/var/tmp/"); + stpcpy (stpcpy (ext_name, "/var/tmp/"), name); + name = ext_name; + + fd = open (ext_name, O_RDONLY); + if (fd == -1) + { + /* Even this file does not exist. */ + error (0, errno, _("cannot load profiling data")); + return NULL; + } + } + + /* We have found the file, now make sure it is the right one for the + data file. */ + if (fstat (fd, &st) < 0) + { + error (0, errno, _("while stat'ing profiling data file")); + close (fd); + return NULL; + } + + if (st.st_size != shobj->expected_size) + { + error (0, 0, _("profiling data file `%s' does match shared object `%s'"), + name, shobj->name); + close (fd); + return NULL; + } + + /* The data file is most probably the right one for our shared + object. Map it now. */ + addr = mmap (NULL, st.st_size, PROT_READ, MAP_SHARED|MAP_FILE, fd, 0); + if (addr == MAP_FAILED) + { + error (0, errno, _("failed to mmap the profiling data file")); + close (fd); + return NULL; + } + + /* We don't need the file desriptor anymore. */ + if (close (fd) < 0) + { + error (0, errno, _("error while closing the profiling data file")); + munmap (addr, st.st_size); + return NULL; + } + + /* Prepare the result. */ + result = (struct profdata *) calloc (1, sizeof (struct profdata)); + if (result == NULL) + { + error (0, errno, _("cannot create internal descriptor")); + munmap (addr, st.st_size); + return NULL; + } + + /* Store the address and size so that we can later free the resources. */ + result->addr = addr; + result->size = st.st_size; + + /* Pointer to data after the header. */ + result->hist = (char *) ((struct gmon_hdr *) addr + 1); + result->kcount = (uint16_t *) ((char *) result->hist + sizeof (uint32_t) + + sizeof (struct gmon_hist_hdr)); + + /* Compute pointer to array of the arc information. */ + narcsp = (uint32_t *) ((char *) result->kcount + shobj->kcountsize + + sizeof (uint32_t)); + result->narcs = *narcsp; + result->data = (struct here_cg_arc_record *) ((char *) narcsp + + sizeof (uint32_t)); + + /* Create the gmon_hdr we expect or write. */ + memset (&gmon_hdr, '\0', sizeof (struct gmon_hdr)); + memcpy (&gmon_hdr.cookie[0], GMON_MAGIC, sizeof (gmon_hdr.cookie)); + *(int32_t *) gmon_hdr.version = GMON_SHOBJ_VERSION; + + /* Create the hist_hdr we expect or write. */ + *(char **) hist_hdr.low_pc = (char *) shobj->lowpc - shobj->map->l_addr; + *(char **) hist_hdr.high_pc = (char *) shobj->highpc - shobj->map->l_addr; + if (do_test) + printf ("low_pc = %p\nhigh_pc = %p\n", + hist_hdr.low_pc, hist_hdr.high_pc); + *(int32_t *) hist_hdr.hist_size = shobj->kcountsize / sizeof (HISTCOUNTER); + *(int32_t *) hist_hdr.prof_rate = __profile_frequency (); + strncpy (hist_hdr.dimen, "seconds", sizeof (hist_hdr.dimen)); + hist_hdr.dimen_abbrev = 's'; + + /* Test whether the header of the profiling data is ok. */ + if (memcmp (addr, &gmon_hdr, sizeof (struct gmon_hdr)) != 0 + || *(uint32_t *) result->hist != GMON_TAG_TIME_HIST + || memcmp (result->hist + sizeof (uint32_t), &hist_hdr, + sizeof (struct gmon_hist_hdr)) != 0 + || narcsp[-1] != GMON_TAG_CG_ARC) + { + free (result); + error (0, 0, _("`%s' is no correct profile data file for `%s'"), + name, shobj->name); + munmap (addr, st.st_size); + return NULL; + } + + /* We are pretty sure now that this is a correct input file. Set up + the remaining information in the result structure and return. */ + result->tos = (uint16_t *) calloc (shobj->tossize + shobj->fromssize, 1); + if (result->tos == NULL) + { + error (0, errno, _("cannot create internal descriptor")); + munmap (addr, st.st_size); + free (result); + return NULL; + } + + result->froms = (struct here_fromstruct *) ((char *) result->tos + + shobj->tossize); + fromidx = 0; + + /* Now we have to process all the arc count entries. */ + fromlimit = shobj->fromlimit; + data = result->data; + froms = result->froms; + tos = result->tos; + for (idx = 0; idx < MIN (*narcsp, fromlimit); ++idx) + { + size_t to_index; + size_t newfromidx; + to_index = (data[idx].self_pc / (shobj->hashfraction * sizeof (*tos))); + newfromidx = fromidx++; + froms[newfromidx].here = &data[idx]; + froms[newfromidx].link = tos[to_index]; + tos[to_index] = newfromidx; + } + + return result; +} + + +static void +unload_profdata (struct profdata *profdata) +{ + free (profdata->tos); + munmap (profdata->addr, profdata->size); + free (profdata); +} + + +static void +count_total_ticks (struct shobj *shobj, struct profdata *profdata) +{ + volatile uint16_t *kcount = profdata->kcount; + uint64_t sum = 0; + size_t idx; + size_t factor = 2 * (65536 / shobj->s_scale); + + for (idx = shobj->kcountsize / sizeof (*kcount); idx > 0; ) + { + --idx; + if (kcount[idx] != 0) + { + size_t n; + + for (n = 0; n < symidx; ++n) + if (sortsym[n]->addr <= factor * idx + && sortsym[n]->addr + sortsym[n]->size > factor * idx) + break; + + if (n < symidx) + printf ("idx = %d, count = %d, name = %s\n", idx, kcount[idx], + sortsym[n]->name); + else + printf ("idx = %d, N/A\n", idx); + } + sum += kcount[idx]; + } + + printf ("total ticks: %10" PRId64 "\n", sum); +} + + +static int +symorder (const void *o1, const void *o2) +{ + const struct known_symbol *p1 = (struct known_symbol *) o1; + const struct known_symbol *p2 = (struct known_symbol *) o2; + + return p1->addr - p2->addr; +} + + +static void +printsym (const void *node, VISIT value, int level) +{ + if (value == leaf || value == postorder) + { + const struct known_symbol *sym = *(const struct known_symbol **) node; + + printf ("Name: %30s, Start: %6x, Len: %5d\n", + sym->name, sym->addr, sym->size); + + sortsym[symidx++] = sym; + } +} + + +static void +read_symbols (struct shobj *shobj) +{ + void *load_addr = (void *) shobj->map->l_addr; + int n = 0; + int idx; + const char *last_name = NULL; + uintptr_t last_addr = 0; + + /* Initialize the obstacks. */ +#define obstack_chunk_alloc malloc +#define obstack_chunk_free free + obstack_init (&shobj->ob_str); + obstack_init (&shobj->ob_sym); + + /* Process the stabs. */ + for (idx = 0; idx < shobj->stab_size; idx += 12) + if (*(shobj->stab + idx + TYPEOFF) == N_FUN) + { + const char *str = (shobj->stabstr + + *((uint32_t *) (shobj->stab + idx + STRDXOFF))); + + if (*str != '\0') + { + last_name = str; + last_addr = *((uint32_t *) (shobj->stab + idx + VALOFF)); + } + else + { + const char *endp; + char *name0; + struct known_symbol *newsym; + + if (last_name == NULL) + abort (); + + endp = strchr (last_name, ':'); + + name0 = (char *) obstack_copy0 (&shobj->ob_str, last_name, + endp - last_name); + if (name0 != NULL) + newsym = + (struct known_symbol *) obstack_alloc (&shobj->ob_sym, + sizeof (*newsym)); + else + /* Keep the stupid compiler happy. */ + newsym = NULL; + if (name0 == NULL || newsym == NULL) + error (EXIT_FAILURE, errno, _("cannot allocate symbol data")); + + newsym->name = name0; + newsym->addr = last_addr; + newsym->size = *((uint32_t *) (shobj->stab + idx + VALOFF)); + + tsearch (newsym, &symroot, symorder); + ++n; + + last_name = NULL; + last_addr = 0; + } + } + + if (shobj->stab == NULL) + { + /* Blarg, the binary is stripped. We have to rely on the + information contained in the dynamic section of the object. */ + const ElfW(Sym) *symtab = (load_addr + + shobj->map->l_info[DT_SYMTAB]->d_un.d_ptr); + const char *strtab = (load_addr + + shobj->map->l_info[DT_STRTAB]->d_un.d_ptr); + + /* We assume that the string table follows the symbol table, + because there is no way in ELF to know the size of the + dynamic symbol table!! */ + while ((void *) symtab < (void *) strtab) + { + if (/*(ELFW(ST_TYPE)(symtab->st_info) == STT_FUNC + || ELFW(ST_TYPE)(symtab->st_info) == STT_NOTYPE) + &&*/ symtab->st_size != 0) + { + struct known_symbol *newsym; + + newsym = + (struct known_symbol *) obstack_alloc (&shobj->ob_sym, + sizeof (*newsym)); + if (newsym == NULL) + error (EXIT_FAILURE, errno, _("cannot allocate symbol data")); + + newsym->name = &strtab[symtab->st_name]; + newsym->addr = symtab->st_value; + newsym->size = symtab->st_size; + + tsearch (newsym, &symroot, symorder); + ++n; + } + } + + ++symtab; + } + + sortsym = malloc (n * sizeof (struct known_symbol *)); + if (sortsym == NULL) + abort (); + + twalk (symroot, printsym); +} |