diff options
Diffstat (limited to 'kernel/arch/x86/vdso/vdso2c.h')
| -rw-r--r-- | kernel/arch/x86/vdso/vdso2c.h | 175 |
1 files changed, 0 insertions, 175 deletions
diff --git a/kernel/arch/x86/vdso/vdso2c.h b/kernel/arch/x86/vdso/vdso2c.h deleted file mode 100644 index 022498755..000000000 --- a/kernel/arch/x86/vdso/vdso2c.h +++ /dev/null @@ -1,175 +0,0 @@ -/* - * This file is included twice from vdso2c.c. It generates code for 32-bit - * and 64-bit vDSOs. We need both for 64-bit builds, since 32-bit vDSOs - * are built for 32-bit userspace. - */ - -static void BITSFUNC(go)(void *raw_addr, size_t raw_len, - void *stripped_addr, size_t stripped_len, - FILE *outfile, const char *name) -{ - int found_load = 0; - unsigned long load_size = -1; /* Work around bogus warning */ - unsigned long mapping_size; - ELF(Ehdr) *hdr = (ELF(Ehdr) *)raw_addr; - int i; - unsigned long j; - ELF(Shdr) *symtab_hdr = NULL, *strtab_hdr, *secstrings_hdr, - *alt_sec = NULL; - ELF(Dyn) *dyn = 0, *dyn_end = 0; - const char *secstrings; - INT_BITS syms[NSYMS] = {}; - - ELF(Phdr) *pt = (ELF(Phdr) *)(raw_addr + GET_LE(&hdr->e_phoff)); - - /* Walk the segment table. */ - for (i = 0; i < GET_LE(&hdr->e_phnum); i++) { - if (GET_LE(&pt[i].p_type) == PT_LOAD) { - if (found_load) - fail("multiple PT_LOAD segs\n"); - - if (GET_LE(&pt[i].p_offset) != 0 || - GET_LE(&pt[i].p_vaddr) != 0) - fail("PT_LOAD in wrong place\n"); - - if (GET_LE(&pt[i].p_memsz) != GET_LE(&pt[i].p_filesz)) - fail("cannot handle memsz != filesz\n"); - - load_size = GET_LE(&pt[i].p_memsz); - found_load = 1; - } else if (GET_LE(&pt[i].p_type) == PT_DYNAMIC) { - dyn = raw_addr + GET_LE(&pt[i].p_offset); - dyn_end = raw_addr + GET_LE(&pt[i].p_offset) + - GET_LE(&pt[i].p_memsz); - } - } - if (!found_load) - fail("no PT_LOAD seg\n"); - - if (stripped_len < load_size) - fail("stripped input is too short\n"); - - /* Walk the dynamic table */ - for (i = 0; dyn + i < dyn_end && - GET_LE(&dyn[i].d_tag) != DT_NULL; i++) { - typeof(dyn[i].d_tag) tag = GET_LE(&dyn[i].d_tag); - if (tag == DT_REL || tag == DT_RELSZ || tag == DT_RELA || - tag == DT_RELENT || tag == DT_TEXTREL) - fail("vdso image contains dynamic relocations\n"); - } - - /* Walk the section table */ - secstrings_hdr = raw_addr + GET_LE(&hdr->e_shoff) + - GET_LE(&hdr->e_shentsize)*GET_LE(&hdr->e_shstrndx); - secstrings = raw_addr + GET_LE(&secstrings_hdr->sh_offset); - for (i = 0; i < GET_LE(&hdr->e_shnum); i++) { - ELF(Shdr) *sh = raw_addr + GET_LE(&hdr->e_shoff) + - GET_LE(&hdr->e_shentsize) * i; - if (GET_LE(&sh->sh_type) == SHT_SYMTAB) - symtab_hdr = sh; - - if (!strcmp(secstrings + GET_LE(&sh->sh_name), - ".altinstructions")) - alt_sec = sh; - } - - if (!symtab_hdr) - fail("no symbol table\n"); - - strtab_hdr = raw_addr + GET_LE(&hdr->e_shoff) + - GET_LE(&hdr->e_shentsize) * GET_LE(&symtab_hdr->sh_link); - - /* Walk the symbol table */ - for (i = 0; - i < GET_LE(&symtab_hdr->sh_size) / GET_LE(&symtab_hdr->sh_entsize); - i++) { - int k; - ELF(Sym) *sym = raw_addr + GET_LE(&symtab_hdr->sh_offset) + - GET_LE(&symtab_hdr->sh_entsize) * i; - const char *name = raw_addr + GET_LE(&strtab_hdr->sh_offset) + - GET_LE(&sym->st_name); - - for (k = 0; k < NSYMS; k++) { - if (!strcmp(name, required_syms[k].name)) { - if (syms[k]) { - fail("duplicate symbol %s\n", - required_syms[k].name); - } - - /* - * Careful: we use negative addresses, but - * st_value is unsigned, so we rely - * on syms[k] being a signed type of the - * correct width. - */ - syms[k] = GET_LE(&sym->st_value); - } - } - } - - /* Validate mapping addresses. */ - for (i = 0; i < sizeof(special_pages) / sizeof(special_pages[0]); i++) { - INT_BITS symval = syms[special_pages[i]]; - - if (!symval) - continue; /* The mapping isn't used; ignore it. */ - - if (symval % 4096) - fail("%s must be a multiple of 4096\n", - required_syms[i].name); - if (symval + 4096 < syms[sym_vvar_start]) - fail("%s underruns vvar_start\n", - required_syms[i].name); - if (symval + 4096 > 0) - fail("%s is on the wrong side of the vdso text\n", - required_syms[i].name); - } - if (syms[sym_vvar_start] % 4096) - fail("vvar_begin must be a multiple of 4096\n"); - - if (!name) { - fwrite(stripped_addr, stripped_len, 1, outfile); - return; - } - - mapping_size = (stripped_len + 4095) / 4096 * 4096; - - fprintf(outfile, "/* AUTOMATICALLY GENERATED -- DO NOT EDIT */\n\n"); - fprintf(outfile, "#include <linux/linkage.h>\n"); - fprintf(outfile, "#include <asm/page_types.h>\n"); - fprintf(outfile, "#include <asm/vdso.h>\n"); - fprintf(outfile, "\n"); - fprintf(outfile, - "static unsigned char raw_data[%lu] __page_aligned_data = {", - mapping_size); - for (j = 0; j < stripped_len; j++) { - if (j % 10 == 0) - fprintf(outfile, "\n\t"); - fprintf(outfile, "0x%02X, ", - (int)((unsigned char *)stripped_addr)[j]); - } - fprintf(outfile, "\n};\n\n"); - - fprintf(outfile, "static struct page *pages[%lu];\n\n", - mapping_size / 4096); - - fprintf(outfile, "const struct vdso_image %s = {\n", name); - fprintf(outfile, "\t.data = raw_data,\n"); - fprintf(outfile, "\t.size = %lu,\n", mapping_size); - fprintf(outfile, "\t.text_mapping = {\n"); - fprintf(outfile, "\t\t.name = \"[vdso]\",\n"); - fprintf(outfile, "\t\t.pages = pages,\n"); - fprintf(outfile, "\t},\n"); - if (alt_sec) { - fprintf(outfile, "\t.alt = %lu,\n", - (unsigned long)GET_LE(&alt_sec->sh_offset)); - fprintf(outfile, "\t.alt_len = %lu,\n", - (unsigned long)GET_LE(&alt_sec->sh_size)); - } - for (i = 0; i < NSYMS; i++) { - if (required_syms[i].export && syms[i]) - fprintf(outfile, "\t.sym_%s = %" PRIi64 ",\n", - required_syms[i].name, (int64_t)syms[i]); - } - fprintf(outfile, "};\n"); -} |