--- /dev/null
+/* Postprocess pmd object files to export hw support
+ *
+ * Copyright 2016 Neil Horman <nhorman@tuxdriver.com>
+ * Based in part on modpost.c from the linux kernel
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License V2, incorporated herein by reference.
+ *
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <errno.h>
+#include "pmdinfogen.h"
+
+#ifdef RTE_ARCH_64
+#define ADDR_SIZE 64
+#else
+#define ADDR_SIZE 32
+#endif
+
+
+static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
+{
+ if (sym)
+ return elf->strtab + sym->st_name;
+ else
+ return "(unknown)";
+}
+
+void *grab_file(const char *filename, unsigned long *size)
+{
+ struct stat st;
+ void *map = MAP_FAILED;
+ int fd;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return NULL;
+ if (fstat(fd, &st))
+ goto failed;
+
+ *size = st.st_size;
+ map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
+
+failed:
+ close(fd);
+ if (map == MAP_FAILED)
+ return NULL;
+ return map;
+}
+
+/**
+ * Return a copy of the next line in a mmap'ed file.
+ * spaces in the beginning of the line is trimmed away.
+ * Return a pointer to a static buffer.
+ **/
+void release_file(void *file, unsigned long size)
+{
+ munmap(file, size);
+}
+
+
+static void *get_sym_value(struct elf_info *info, const Elf_Sym *sym)
+{
+ void *ptr = (void *)info->hdr + info->sechdrs[sym->st_shndx].sh_offset;
+
+ return (void *)(ptr + sym->st_value);
+}
+
+static Elf_Sym *find_sym_in_symtab(struct elf_info *info,
+ const char *name, Elf_Sym *last)
+{
+ Elf_Sym *idx;
+ if (last)
+ idx = last+1;
+ else
+ idx = info->symtab_start;
+
+ for (; idx < info->symtab_stop; idx++) {
+ const char *n = sym_name(info, idx);
+ if (!strncmp(n, name, strlen(name)))
+ return idx;
+ }
+ return NULL;
+}
+
+static int parse_elf(struct elf_info *info, const char *filename)
+{
+ unsigned int i;
+ Elf_Ehdr *hdr;
+ Elf_Shdr *sechdrs;
+ Elf_Sym *sym;
+ const char *secstrings;
+ int endian;
+ unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
+
+ hdr = grab_file(filename, &info->size);
+ if (!hdr) {
+ perror(filename);
+ exit(1);
+ }
+ info->hdr = hdr;
+ if (info->size < sizeof(*hdr)) {
+ /* file too small, assume this is an empty .o file */
+ return 0;
+ }
+ /* Is this a valid ELF file? */
+ if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
+ (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
+ (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
+ (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
+ /* Not an ELF file - silently ignore it */
+ return 0;
+ }
+
+ if (!hdr->e_ident[EI_DATA]) {
+ /* Unknown endian */
+ return 0;
+ }
+
+ endian = hdr->e_ident[EI_DATA];
+
+ /* Fix endianness in ELF header */
+ hdr->e_type = TO_NATIVE(endian, 16, hdr->e_type);
+ hdr->e_machine = TO_NATIVE(endian, 16, hdr->e_machine);
+ hdr->e_version = TO_NATIVE(endian, 32, hdr->e_version);
+ hdr->e_entry = TO_NATIVE(endian, ADDR_SIZE, hdr->e_entry);
+ hdr->e_phoff = TO_NATIVE(endian, ADDR_SIZE, hdr->e_phoff);
+ hdr->e_shoff = TO_NATIVE(endian, ADDR_SIZE, hdr->e_shoff);
+ hdr->e_flags = TO_NATIVE(endian, 32, hdr->e_flags);
+ hdr->e_ehsize = TO_NATIVE(endian, 16, hdr->e_ehsize);
+ hdr->e_phentsize = TO_NATIVE(endian, 16, hdr->e_phentsize);
+ hdr->e_phnum = TO_NATIVE(endian, 16, hdr->e_phnum);
+ hdr->e_shentsize = TO_NATIVE(endian, 16, hdr->e_shentsize);
+ hdr->e_shnum = TO_NATIVE(endian, 16, hdr->e_shnum);
+ hdr->e_shstrndx = TO_NATIVE(endian, 16, hdr->e_shstrndx);
+
+ sechdrs = (void *)hdr + hdr->e_shoff;
+ info->sechdrs = sechdrs;
+
+ /* Check if file offset is correct */
+ if (hdr->e_shoff > info->size) {
+ fprintf(stderr, "section header offset=%lu in file '%s' "
+ "is bigger than filesize=%lu\n",
+ (unsigned long)hdr->e_shoff,
+ filename, info->size);
+ return 0;
+ }
+
+ if (hdr->e_shnum == SHN_UNDEF) {
+ /*
+ * There are more than 64k sections,
+ * read count from .sh_size.
+ */
+ info->num_sections = TO_NATIVE(endian, 32, sechdrs[0].sh_size);
+ } else {
+ info->num_sections = hdr->e_shnum;
+ }
+ if (hdr->e_shstrndx == SHN_XINDEX)
+ info->secindex_strings =
+ TO_NATIVE(endian, 32, sechdrs[0].sh_link);
+ else
+ info->secindex_strings = hdr->e_shstrndx;
+
+ /* Fix endianness in section headers */
+ for (i = 0; i < info->num_sections; i++) {
+ sechdrs[i].sh_name =
+ TO_NATIVE(endian, 32, sechdrs[i].sh_name);
+ sechdrs[i].sh_type =
+ TO_NATIVE(endian, 32, sechdrs[i].sh_type);
+ sechdrs[i].sh_flags =
+ TO_NATIVE(endian, 32, sechdrs[i].sh_flags);
+ sechdrs[i].sh_addr =
+ TO_NATIVE(endian, ADDR_SIZE, sechdrs[i].sh_addr);
+ sechdrs[i].sh_offset =
+ TO_NATIVE(endian, ADDR_SIZE, sechdrs[i].sh_offset);
+ sechdrs[i].sh_size =
+ TO_NATIVE(endian, 32, sechdrs[i].sh_size);
+ sechdrs[i].sh_link =
+ TO_NATIVE(endian, 32, sechdrs[i].sh_link);
+ sechdrs[i].sh_info =
+ TO_NATIVE(endian, 32, sechdrs[i].sh_info);
+ sechdrs[i].sh_addralign =
+ TO_NATIVE(endian, ADDR_SIZE, sechdrs[i].sh_addralign);
+ sechdrs[i].sh_entsize =
+ TO_NATIVE(endian, ADDR_SIZE, sechdrs[i].sh_entsize);
+ }
+ /* Find symbol table. */
+ secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
+ for (i = 1; i < info->num_sections; i++) {
+ int nobits = sechdrs[i].sh_type == SHT_NOBITS;
+
+ if (!nobits && sechdrs[i].sh_offset > info->size) {
+ fprintf(stderr, "%s is truncated. "
+ "sechdrs[i].sh_offset=%lu > sizeof(*hrd)=%zu\n",
+ filename, (unsigned long)sechdrs[i].sh_offset,
+ sizeof(*hdr));
+ return 0;
+ }
+
+ if (sechdrs[i].sh_type == SHT_SYMTAB) {
+ unsigned int sh_link_idx;
+ symtab_idx = i;
+ info->symtab_start = (void *)hdr +
+ sechdrs[i].sh_offset;
+ info->symtab_stop = (void *)hdr +
+ sechdrs[i].sh_offset + sechdrs[i].sh_size;
+ sh_link_idx = sechdrs[i].sh_link;
+ info->strtab = (void *)hdr +
+ sechdrs[sh_link_idx].sh_offset;
+ }
+
+ /* 32bit section no. table? ("more than 64k sections") */
+ if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
+ symtab_shndx_idx = i;
+ info->symtab_shndx_start = (void *)hdr +
+ sechdrs[i].sh_offset;
+ info->symtab_shndx_stop = (void *)hdr +
+ sechdrs[i].sh_offset + sechdrs[i].sh_size;
+ }
+ }
+ if (!info->symtab_start)
+ fprintf(stderr, "%s has no symtab?\n", filename);
+
+ /* Fix endianness in symbols */
+ for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
+ sym->st_shndx = TO_NATIVE(endian, 16, sym->st_shndx);
+ sym->st_name = TO_NATIVE(endian, 32, sym->st_name);
+ sym->st_value = TO_NATIVE(endian, ADDR_SIZE, sym->st_value);
+ sym->st_size = TO_NATIVE(endian, ADDR_SIZE, sym->st_size);
+ }
+
+ if (symtab_shndx_idx != ~0U) {
+ Elf32_Word *p;
+ if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
+ fprintf(stderr,
+ "%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
+ filename, sechdrs[symtab_shndx_idx].sh_link,
+ symtab_idx);
+ /* Fix endianness */
+ for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
+ p++)
+ *p = TO_NATIVE(endian, 32, *p);
+ }
+
+ return 1;
+}
+
+static void parse_elf_finish(struct elf_info *info)
+{
+ struct pmd_driver *tmp, *idx = info->drivers;
+ release_file(info->hdr, info->size);
+ while (idx) {
+ tmp = idx->next;
+ free(idx);
+ idx = tmp;
+ }
+}
+
+static const char *sec_name(struct elf_info *elf, int secindex)
+{
+ Elf_Shdr *sechdrs = elf->sechdrs;
+ return (void *)elf->hdr +
+ elf->sechdrs[elf->secindex_strings].sh_offset +
+ sechdrs[secindex].sh_name;
+}
+
+static int get_symbol_index(struct elf_info *info, Elf_Sym *sym)
+{
+ const char *name = sym_name(info, sym);
+ const char *idx;
+
+ idx = name;
+ while (idx) {
+ if (isdigit(*idx))
+ return atoi(idx);
+ idx++;
+ }
+ return -1;
+}
+
+struct opt_tag {
+ const char *suffix;
+ const char *json_id;
+};
+
+static const struct opt_tag opt_tags[] = {
+ {"_param_string_export", "params"},
+};
+
+static int complete_pmd_entry(struct elf_info *info, struct pmd_driver *drv)
+{
+ const char *tname;
+ int i;
+ char tmpsymname[128];
+ Elf_Sym *tmpsym;
+
+ drv->name = get_sym_value(info, drv->name_sym);
+
+ for (i = 0; i < PMD_OPT_MAX; i++) {
+ memset(tmpsymname, 0, 128);
+ sprintf(tmpsymname, "__%s%s", drv->name, opt_tags[i].suffix);
+ tmpsym = find_sym_in_symtab(info, tmpsymname, NULL);
+ if (!tmpsym)
+ continue;
+ drv->opt_vals[i] = get_sym_value(info, tmpsym);
+ }
+
+ memset(tmpsymname, 0, 128);
+ sprintf(tmpsymname, "__%s_pci_tbl_export", drv->name);
+
+ tmpsym = find_sym_in_symtab(info, tmpsymname, NULL);
+
+
+ /*
+ * If this returns NULL, then this is a PMD_VDEV, because
+ * it has no pci table reference
+ */
+ if (!tmpsym) {
+ drv->pci_tbl = NULL;
+ return 0;
+ }
+
+ tname = get_sym_value(info, tmpsym);
+ tmpsym = find_sym_in_symtab(info, tname, NULL);
+ if (!tmpsym)
+ return -ENOENT;
+
+ drv->pci_tbl = (struct rte_pci_id *)get_sym_value(info, tmpsym);
+ if (!drv->pci_tbl)
+ return -ENOENT;
+
+ return 0;
+}
+
+static int locate_pmd_entries(struct elf_info *info)
+{
+ Elf_Sym *last = NULL;
+ struct pmd_driver *new;
+
+ info->drivers = NULL;
+
+ do {
+ new = calloc(sizeof(struct pmd_driver), 1);
+ new->name_sym = find_sym_in_symtab(info, "this_pmd_name", last);
+ last = new->name_sym;
+ if (!new->name_sym)
+ free(new);
+ else {
+ if (complete_pmd_entry(info, new)) {
+ fprintf(stderr,
+ "Failed to complete pmd entry\n");
+ free(new);
+ } else {
+ new->next = info->drivers;
+ info->drivers = new;
+ }
+ }
+ } while (last);
+}
+
+static void output_pmd_info_string(struct elf_info *info, char *outfile)
+{
+ FILE *ofd;
+ struct pmd_driver *drv;
+ struct rte_pci_id *pci_ids;
+ int idx = 0;
+
+ ofd = fopen(outfile, "w+");
+ if (!ofd) {
+ fprintf(stderr, "Unable to open output file\n");
+ return;
+ }
+
+ drv = info->drivers;
+
+ while (drv) {
+ fprintf(ofd, "const char %s_pmd_info[] __attribute__((used)) = "
+ "\"PMD_INFO_STRING= {",
+ drv->name);
+ fprintf(ofd, "\\\"name\\\" : \\\"%s\\\", ", drv->name);
+
+ for (idx = 0; idx < PMD_OPT_MAX; idx++) {
+ if (drv->opt_vals[idx])
+ fprintf(ofd, "\\\"%s\\\" : \\\"%s\\\", ",
+ opt_tags[idx].json_id,
+ drv->opt_vals[idx]);
+ }
+
+ pci_ids = drv->pci_tbl;
+ fprintf(ofd, "\\\"pci_ids\\\" : [");
+
+ while (pci_ids && pci_ids->device_id) {
+ fprintf(ofd, "[%d, %d, %d, %d]",
+ pci_ids->vendor_id, pci_ids->device_id,
+ pci_ids->subsystem_vendor_id,
+ pci_ids->subsystem_device_id);
+ pci_ids++;
+ if (pci_ids->device_id)
+ fprintf(ofd, ",");
+ else
+ fprintf(ofd, " ");
+ }
+ fprintf(ofd, "]}\";");
+ drv = drv->next;
+ }
+
+ fclose(ofd);
+}
+
+int main(int argc, char **argv)
+{
+ struct elf_info info;
+ int rc = 1;
+
+ if (argc < 3) {
+ fprintf(stderr,
+ "usage: pmdinfo <object file> <c output file>\n");
+ exit(127);
+ }
+ parse_elf(&info, argv[1]);
+
+ locate_pmd_entries(&info);
+
+ if (info.drivers) {
+ output_pmd_info_string(&info, argv[2]);
+ rc = 0;
+ } else {
+ fprintf(stderr, "No drivers registered\n");
+ }
+
+ parse_elf_finish(&info);
+ exit(rc);
+}
git.droids-corp.org / dpdk.git / blobdiff