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author | Nicolas Blanc <nicolas.blanc@intel.com> | 2013-07-17 11:44:26 +0200 |
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committer | Nicolas Blanc <nicolas.blanc@intel.com> | 2013-10-29 10:56:45 +0100 |
commit | 681f229a9fbf72ce7882bf81122f1f18bce96c0e (patch) | |
tree | 43af29f04ff8c4641084123659b07c2e6b95a4a4 /gdb/testsuite/gdb.base/sym-file-loader.c | |
parent | e9f0e62efd736ec42eb7da1520655f136481a411 (diff) | |
download | binutils-681f229a9fbf72ce7882bf81122f1f18bce96c0e.zip binutils-681f229a9fbf72ce7882bf81122f1f18bce96c0e.tar.gz binutils-681f229a9fbf72ce7882bf81122f1f18bce96c0e.tar.bz2 |
Test adding and removing a symbol file at runtime.
This test exercises the commands 'add-symbol-file'
and 'remove-symbol-file'.
2013-10-29 Nicolas Blanc <nicolas.blanc@intel.com>
gdb/testsuite
* gdb.base/sym-file-lib.c: New file.
* gdb.base/sym-file-loader.c: New file.
* gdb.base/sym-file-loader.h: New file.
* gdb.base/sym-file-main.c: New file.
* gdb.base/sym-file.exp: New file.
Signed-off-by: Nicolas Blanc <nicolas.blanc@intel.com>
Diffstat (limited to 'gdb/testsuite/gdb.base/sym-file-loader.c')
-rw-r--r-- | gdb/testsuite/gdb.base/sym-file-loader.c | 353 |
1 files changed, 353 insertions, 0 deletions
diff --git a/gdb/testsuite/gdb.base/sym-file-loader.c b/gdb/testsuite/gdb.base/sym-file-loader.c new file mode 100644 index 0000000..c55076f --- /dev/null +++ b/gdb/testsuite/gdb.base/sym-file-loader.c @@ -0,0 +1,353 @@ +/* Copyright 2013 Free Software Foundation, Inc. + 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 3 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, see <http://www.gnu.org/licenses/>. +*/ + +#include <unistd.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/mman.h> + +#include "sym-file-loader.h" + +#ifdef TARGET_LP64 + +uint8_t +elf_st_type (uint8_t st_info) +{ + return ELF64_ST_TYPE (st_info); +} + +#elif defined TARGET_ILP32 + +uint8_t +elf_st_type (uint8_t st_info) +{ + return ELF32_ST_TYPE (st_info); +} + +#endif + +/* Load a program segment. */ + +static struct segment * +load (uint8_t *addr, Elf_External_Phdr *phdr, struct segment *tail_seg) +{ + struct segment *seg = NULL; + uint8_t *mapped_addr = NULL; + void *from = NULL; + void *to = NULL; + + /* For the sake of simplicity all operations are permitted. */ + unsigned perm = PROT_READ | PROT_WRITE | PROT_EXEC; + + mapped_addr = (uint8_t *) mmap ((void *) GETADDR (phdr, p_vaddr), + GET (phdr, p_memsz), perm, + MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); + + from = (void *) (addr + GET (phdr, p_offset)); + to = (void *) mapped_addr; + + memcpy (to, from, GET (phdr, p_filesz)); + + seg = (struct segment *) malloc (sizeof (struct segment)); + + if (seg == 0) + return 0; + + seg->mapped_addr = mapped_addr; + seg->phdr = phdr; + seg->next = 0; + + if (tail_seg != 0) + tail_seg->next = seg; + + return seg; +} + +/* Mini shared library loader. No reallocation + is performed for the sake of simplicity. */ + +int +load_shlib (const char *file, Elf_External_Ehdr **ehdr_out, + struct segment **seg_out) +{ + uint64_t i; + int fd; + off_t fsize; + uint8_t *addr; + Elf_External_Ehdr *ehdr; + Elf_External_Phdr *phdr; + struct segment *head_seg = NULL; + struct segment *tail_seg = NULL; + + /* Map the lib in memory for reading. */ + fd = open (file, O_RDONLY); + if (fd < 0) + { + perror ("fopen failed."); + return -1; + } + + fsize = lseek (fd, 0, SEEK_END); + + if (fsize < 0) + { + perror ("lseek failed."); + return -1; + } + + addr = (uint8_t *) mmap (NULL, fsize, PROT_READ, MAP_PRIVATE, fd, 0); + if (addr == (uint8_t *) -1) + { + perror ("mmap failed."); + return -1; + } + + /* Check if the lib is an ELF file. */ + ehdr = (Elf_External_Ehdr *) addr; + if (ehdr->e_ident[EI_MAG0] != ELFMAG0 + || ehdr->e_ident[EI_MAG1] != ELFMAG1 + || ehdr->e_ident[EI_MAG2] != ELFMAG2 + || ehdr->e_ident[EI_MAG3] != ELFMAG3) + { + printf ("Not an ELF file: %x\n", ehdr->e_ident[EI_MAG0]); + return -1; + } + + if (ehdr->e_ident[EI_CLASS] == ELFCLASS32) + { + if (sizeof (void *) != 4) + { + printf ("Architecture mismatch."); + return -1; + } + } + else if (ehdr->e_ident[EI_CLASS] == ELFCLASS64) + { + if (sizeof (void *) != 8) + { + printf ("Architecture mismatch."); + return -1; + } + } + + /* Load the program segments. For the sake of simplicity + assume that no reallocation is needed. */ + phdr = (Elf_External_Phdr *) (addr + GET (ehdr, e_phoff)); + for (i = 0; i < GET (ehdr, e_phnum); i++, phdr++) + { + if (GET (phdr, p_type) == PT_LOAD) + { + struct segment *next_seg = load (addr, phdr, tail_seg); + if (next_seg == 0) + continue; + tail_seg = next_seg; + if (head_seg == 0) + head_seg = next_seg; + } + } + *ehdr_out = ehdr; + *seg_out = head_seg; + return 0; +} + +/* Return the section-header table. */ + +Elf_External_Shdr * +find_shdrtab (Elf_External_Ehdr *ehdr) +{ + return (Elf_External_Shdr *) (((uint8_t *) ehdr) + GET (ehdr, e_shoff)); +} + +/* Return the string table of the section headers. */ + +const char * +find_shstrtab (Elf_External_Ehdr *ehdr, uint64_t *size) +{ + const Elf_External_Shdr *shdr; + const Elf_External_Shdr *shstr; + + if (GET (ehdr, e_shnum) <= GET (ehdr, e_shstrndx)) + { + printf ("The index of the string table is corrupt."); + return NULL; + } + + shdr = find_shdrtab (ehdr); + + shstr = &shdr[GET (ehdr, e_shstrndx)]; + *size = GET (shstr, sh_size); + return ((const char *) ehdr) + GET (shstr, sh_offset); +} + +/* Return the string table named SECTION. */ + +const char * +find_strtab (Elf_External_Ehdr *ehdr, + const char *section, uint64_t *strtab_size) +{ + uint64_t shstrtab_size = 0; + const char *shstrtab; + uint64_t i; + const Elf_External_Shdr *shdr = find_shdrtab (ehdr); + + /* Get the string table of the section headers. */ + shstrtab = find_shstrtab (ehdr, &shstrtab_size); + if (shstrtab == NULL) + return NULL; + + for (i = 0; i < GET (ehdr, e_shnum); i++) + { + uint64_t name = GET (shdr + i, sh_name); + if (GET (shdr + i, sh_type) == SHT_STRTAB && name <= shstrtab_size + && strcmp ((const char *) &shstrtab[name], section) == 0) + { + *strtab_size = GET (shdr + i, sh_size); + return ((const char *) ehdr) + GET (shdr + i, sh_offset); + } + + } + return NULL; +} + +/* Return the section header named SECTION. */ + +Elf_External_Shdr * +find_shdr (Elf_External_Ehdr *ehdr, const char *section) +{ + uint64_t shstrtab_size = 0; + const char *shstrtab; + uint64_t i; + + /* Get the string table of the section headers. */ + shstrtab = find_shstrtab (ehdr, &shstrtab_size); + if (shstrtab == NULL) + return NULL; + + Elf_External_Shdr *shdr = find_shdrtab (ehdr); + for (i = 0; i < GET (ehdr, e_shnum); i++) + { + uint64_t name = GET (shdr + i, sh_name); + if (name <= shstrtab_size) + { + if (strcmp ((const char *) &shstrtab[name], section) == 0) + return &shdr[i]; + } + + } + return NULL; +} + +/* Return the symbol table. */ + +Elf_External_Sym * +find_symtab (Elf_External_Ehdr *ehdr, uint64_t *symtab_size) +{ + uint64_t i; + const Elf_External_Shdr *shdr = find_shdrtab (ehdr); + + for (i = 0; i < GET (ehdr, e_shnum); i++) + { + if (GET (shdr + i, sh_type) == SHT_SYMTAB) + { + *symtab_size = GET (shdr + i, sh_size) / sizeof (Elf_External_Sym); + return (Elf_External_Sym *) (((const char *) ehdr) + + GET (shdr + i, sh_offset)); + } + } + return NULL; +} + +/* Translate a file offset to an address in a loaded segment. */ + +int +translate_offset (uint64_t file_offset, struct segment *seg, void **addr) +{ + while (seg) + { + uint64_t p_from, p_to; + + Elf_External_Phdr *phdr = seg->phdr; + + if (phdr == NULL) + { + seg = seg->next; + continue; + } + + p_from = GET (phdr, p_offset); + p_to = p_from + GET (phdr, p_filesz); + + if (p_from <= file_offset && file_offset < p_to) + { + *addr = (void *) (seg->mapped_addr + (file_offset - p_from)); + return 0; + } + seg = seg->next; + } + + return -1; +} + +/* Lookup the address of FUNC. */ + +int +lookup_function (const char *func, + Elf_External_Ehdr *ehdr, struct segment *seg, void **addr) +{ + const char *strtab; + uint64_t strtab_size = 0; + Elf_External_Sym *symtab; + uint64_t symtab_size = 0; + uint64_t i; + + /* Get the string table for the symbols. */ + strtab = find_strtab (ehdr, ".strtab", &strtab_size); + if (strtab == NULL) + { + printf (".strtab not found."); + return -1; + } + + /* Get the symbol table. */ + symtab = find_symtab (ehdr, &symtab_size); + if (symtab == NULL) + { + printf ("symbol table not found."); + return -1; + } + + for (i = 0; i < symtab_size; i++) + { + Elf_External_Sym *sym = &symtab[i]; + + if (elf_st_type (GET (sym, st_info)) != STT_FUNC) + continue; + + if (GET (sym, st_name) < strtab_size) + { + const char *name = &strtab[GET (sym, st_name)]; + if (strcmp (name, func) == 0) + { + + uint64_t offset = GET (sym, st_value); + return translate_offset (offset, seg, addr); + } + } + } + + return -1; +} |