107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <elf.h>
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#include <err.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include "gprof.h"
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static bool wantsym(const Elf_Sym *, const char *);
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/* Things which get -E excluded by default. */
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static char *excludes[] = { ".mcount", "_mcleanup", NULL };
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int
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elf_getnfile(const char *filename, char ***defaultEs)
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{
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int fd;
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Elf_Ehdr h;
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struct stat s;
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void *mapbase;
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const char *base;
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const Elf_Shdr *shdrs;
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const Elf_Shdr *sh_symtab;
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const Elf_Shdr *sh_strtab;
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const char *strtab;
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const Elf_Sym *symtab;
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int symtabct;
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int i;
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if ((fd = open(filename, O_RDONLY)) == -1)
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err(1, "%s", filename);
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if (read(fd, &h, sizeof h) != sizeof h || !IS_ELF(h)) {
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close(fd);
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return -1;
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}
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if (fstat(fd, &s) == -1)
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err(1, "Cannot fstat %s", filename);
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if ((mapbase = mmap(0, s.st_size, PROT_READ, MAP_SHARED, fd, 0)) ==
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MAP_FAILED)
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err(1, "Cannot mmap %s", filename);
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close(fd);
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base = (const char *)mapbase;
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shdrs = (const Elf_Shdr *)(base + h.e_shoff);
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/* Find the symbol table and associated string table section. */
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for (i = 1; i < h.e_shnum; i++)
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if (shdrs[i].sh_type == SHT_SYMTAB)
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break;
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if (i == h.e_shnum)
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errx(1, "%s has no symbol table", filename);
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sh_symtab = &shdrs[i];
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sh_strtab = &shdrs[sh_symtab->sh_link];
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symtab = (const Elf_Sym *)(base + sh_symtab->sh_offset);
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symtabct = sh_symtab->sh_size / sh_symtab->sh_entsize;
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strtab = (const char *)(base + sh_strtab->sh_offset);
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/* Count the symbols that we're interested in. */
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nname = 0;
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for (i = 1; i < symtabct; i++)
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if (wantsym(&symtab[i], strtab))
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nname++;
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/* Allocate memory for them, plus a terminating entry. */
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if ((nl = (nltype *)calloc(nname + 1, sizeof(nltype))) == NULL)
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errx(1, "Insufficient memory for symbol table");
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/* Read them in. */
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npe = nl;
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for (i = 1; i < symtabct; i++) {
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const Elf_Sym *sym = &symtab[i];
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if (wantsym(sym, strtab)) {
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npe->value = sym->st_value;
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npe->name = strtab + sym->st_name;
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npe++;
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}
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}
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npe->value = -1;
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*defaultEs = excludes;
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return 0;
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}
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static bool
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wantsym(const Elf_Sym *sym, const char *strtab)
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{
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int type;
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int bind;
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type = ELF_ST_TYPE(sym->st_info);
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bind = ELF_ST_BIND(sym->st_info);
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if (type != STT_FUNC ||
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bind == STB_WEAK ||
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(aflag && bind == STB_LOCAL) ||
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(uflag && strchr(strtab + sym->st_name, '.') != NULL))
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return 0;
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return 1;
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}
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