The file maps details are got from the maps linked list which was populated in Patch 5 and they are filled as a note in the following format.
long count -- how many files are mapped long page_size -- units for file_ofs array of [COUNT] elements of long start long end long file_ofs followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL... Signed-off-by: Suzuki K. Poulose <[email protected]> Signed-off-by: Janani Venkataraman <[email protected]> --- src/elf.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ src/elf32.c | 1 + src/elf64.c | 1 + 3 files changed, 80 insertions(+) diff --git a/src/elf.c b/src/elf.c index b7fd6d0..9e3623f 100644 --- a/src/elf.c +++ b/src/elf.c @@ -308,6 +308,79 @@ static int get_auxv(int pid, struct core_proc *cp) return ret; } +/* + * Get File Maps in the following format: + * long count -- how many files are mapped + * long page_size -- units for file_ofs + * array of [COUNT] elements of + * long start + * long end + * long file_ofs + * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL... + */ +static int get_file_maps(struct core_proc *cp) +{ + Elf_Long count = 0; + Elf_Long fmap_size = 0, namesz = 0; + Elf_Long *fmap; + Elf_Long *data_pos; + unsigned char *name_pos; + int ret; + struct maps *map = cp->vmas; + + /* + * Finding the actual size of the file map for which we need + * to know number of VMAS(non zero inode) plus the file name size + * for each of the VMAS(non zero inode. + */ + while (map) { + if (map->inode) { + count++; + namesz += strlen(map->fname) + 1; + } + map = map->next; + } + + /* + * We add 2 for the count and page_size, 3 * (number of vmas) + * for the start, end and file_ofs and finally the entire size + * of the filenames of all the VMAS. + */ + fmap_size = ((2 + (3 * count)) * sizeof(Elf_Long)) + + (namesz * sizeof(unsigned char)); + + fmap = calloc(fmap_size, 1); + if (!fmap) { + status = errno; + gencore_log("Could not allocate memory for file map data\n"); + return -1; + } + + data_pos = fmap + 2; + name_pos = (unsigned char *)(fmap + 2 + (count * 3)); + + map = cp->vmas; + while (map) { + if (map->inode) { + *data_pos++ = map->src; + *data_pos++ = map->dst; + *data_pos++ = map->offset; + + strcpy(name_pos, map->fname); + name_pos += strlen(map->fname) + 1; + } + map = map->next; + } + + fmap[0] = count; + fmap[1] = 1; + + ret = add_note("CORE", NT_FILE, fmap_size, fmap, cp); + free(fmap); + + return ret; +} + int do_elf_coredump(int pid, struct core_proc *cp) { int ret; @@ -327,5 +400,10 @@ int do_elf_coredump(int pid, struct core_proc *cp) if (ret) return -1; + /* Get File maps */ + ret = get_file_maps(cp); + if (ret) + return -1; + return 0; } diff --git a/src/elf32.c b/src/elf32.c index 8778bed..0f7c03d 100644 --- a/src/elf32.c +++ b/src/elf32.c @@ -35,5 +35,6 @@ #define Elf_Shdr Elf32_Shdr #define Elf_Nhdr Elf32_Nhdr #define Elf_prpsinfo compat_elf_prpsinfo +#define Elf_Long int #include "elf.c" diff --git a/src/elf64.c b/src/elf64.c index d062888..77da222 100644 --- a/src/elf64.c +++ b/src/elf64.c @@ -35,5 +35,6 @@ #define Elf_Shdr Elf64_Shdr #define Elf_Nhdr Elf64_Nhdr #define Elf_prpsinfo elf_prpsinfo +#define Elf_Long long #include "elf.c" -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
