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Diffstat (limited to 'arch/x86/vdso/vdso2c.h')
-rw-r--r--arch/x86/vdso/vdso2c.h105
1 files changed, 51 insertions, 54 deletions
diff --git a/arch/x86/vdso/vdso2c.h b/arch/x86/vdso/vdso2c.h
index c6eefaf389b..fd57829b30d 100644
--- a/arch/x86/vdso/vdso2c.h
+++ b/arch/x86/vdso/vdso2c.h
@@ -4,23 +4,23 @@
* are built for 32-bit userspace.
*/
-static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
+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 data_size;
- Elf_Ehdr *hdr = (Elf_Ehdr *)addr;
+ 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,
+ ELF(Shdr) *symtab_hdr = NULL, *strtab_hdr, *secstrings_hdr,
*alt_sec = NULL;
- Elf_Dyn *dyn = 0, *dyn_end = 0;
+ ELF(Dyn) *dyn = 0, *dyn_end = 0;
const char *secstrings;
- uint64_t syms[NSYMS] = {};
+ INT_BITS syms[NSYMS] = {};
- uint64_t fake_sections_value = 0, fake_sections_size = 0;
-
- Elf_Phdr *pt = (Elf_Phdr *)(addr + GET_LE(&hdr->e_phoff));
+ 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++) {
@@ -38,30 +38,32 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
load_size = GET_LE(&pt[i].p_memsz);
found_load = 1;
} else if (GET_LE(&pt[i].p_type) == PT_DYNAMIC) {
- dyn = addr + GET_LE(&pt[i].p_offset);
- dyn_end = addr + GET_LE(&pt[i].p_offset) +
+ 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");
- data_size = (load_size + 4095) / 4096 * 4096;
+
+ 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 ||
+ 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 = addr + GET_LE(&hdr->e_shoff) +
+ secstrings_hdr = raw_addr + GET_LE(&hdr->e_shoff) +
GET_LE(&hdr->e_shentsize)*GET_LE(&hdr->e_shstrndx);
- secstrings = addr + GET_LE(&secstrings_hdr->sh_offset);
+ secstrings = raw_addr + GET_LE(&secstrings_hdr->sh_offset);
for (i = 0; i < GET_LE(&hdr->e_shnum); i++) {
- Elf_Shdr *sh = addr + GET_LE(&hdr->e_shoff) +
+ 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;
@@ -74,7 +76,7 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
if (!symtab_hdr)
fail("no symbol table\n");
- strtab_hdr = addr + GET_LE(&hdr->e_shoff) +
+ strtab_hdr = raw_addr + GET_LE(&hdr->e_shoff) +
GET_LE(&hdr->e_shentsize) * GET_LE(&symtab_hdr->sh_link);
/* Walk the symbol table */
@@ -82,27 +84,27 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
i < GET_LE(&symtab_hdr->sh_size) / GET_LE(&symtab_hdr->sh_entsize);
i++) {
int k;
- Elf_Sym *sym = addr + GET_LE(&symtab_hdr->sh_offset) +
+ ELF(Sym) *sym = raw_addr + GET_LE(&symtab_hdr->sh_offset) +
GET_LE(&symtab_hdr->sh_entsize) * i;
- const char *name = addr + GET_LE(&strtab_hdr->sh_offset) +
+ 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])) {
+ if (!strcmp(name, required_syms[k].name)) {
if (syms[k]) {
fail("duplicate symbol %s\n",
- required_syms[k]);
+ 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);
}
}
-
- if (!strcmp(name, "vdso_fake_sections")) {
- if (fake_sections_value)
- fail("duplicate vdso_fake_sections\n");
- fake_sections_value = GET_LE(&sym->st_value);
- fake_sections_size = GET_LE(&sym->st_size);
- }
}
/* Validate mapping addresses. */
@@ -112,30 +114,24 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
if (syms[i] % 4096)
fail("%s must be a multiple of 4096\n",
- required_syms[i]);
- if (syms[i] < data_size)
- fail("%s must be after the text mapping\n",
- required_syms[i]);
- if (syms[sym_end_mapping] < syms[i] + 4096)
- fail("%s overruns end_mapping\n", required_syms[i]);
+ required_syms[i].name);
+ if (syms[sym_vvar_start] > syms[i] + 4096)
+ fail("%s underruns begin_vvar\n",
+ required_syms[i].name);
+ if (syms[i] + 4096 > 0)
+ fail("%s is on the wrong side of the vdso text\n",
+ required_syms[i].name);
}
- if (syms[sym_end_mapping] % 4096)
- fail("end_mapping must be a multiple of 4096\n");
-
- /* Remove sections or use fakes */
- if (fake_sections_size % sizeof(Elf_Shdr))
- fail("vdso_fake_sections size is not a multiple of %ld\n",
- (long)sizeof(Elf_Shdr));
- PUT_LE(&hdr->e_shoff, fake_sections_value);
- PUT_LE(&hdr->e_shentsize, fake_sections_value ? sizeof(Elf_Shdr) : 0);
- PUT_LE(&hdr->e_shnum, fake_sections_size / sizeof(Elf_Shdr));
- PUT_LE(&hdr->e_shstrndx, SHN_UNDEF);
+ if (syms[sym_vvar_start] % 4096)
+ fail("vvar_begin must be a multiple of 4096\n");
if (!name) {
- fwrite(addr, load_size, 1, outfile);
+ 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");
@@ -143,20 +139,21 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
fprintf(outfile, "\n");
fprintf(outfile,
"static unsigned char raw_data[%lu] __page_aligned_data = {",
- data_size);
- for (j = 0; j < load_size; j++) {
+ mapping_size);
+ for (j = 0; j < stripped_len; j++) {
if (j % 10 == 0)
fprintf(outfile, "\n\t");
- fprintf(outfile, "0x%02X, ", (int)((unsigned char *)addr)[j]);
+ fprintf(outfile, "0x%02X, ",
+ (int)((unsigned char *)stripped_addr)[j]);
}
fprintf(outfile, "\n};\n\n");
fprintf(outfile, "static struct page *pages[%lu];\n\n",
- data_size / 4096);
+ 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", data_size);
+ 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");
@@ -168,9 +165,9 @@ static void GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
(unsigned long)GET_LE(&alt_sec->sh_size));
}
for (i = 0; i < NSYMS; i++) {
- if (syms[i])
- fprintf(outfile, "\t.sym_%s = 0x%" PRIx64 ",\n",
- required_syms[i], syms[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");
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-09-30 23:39:38 +0000