-/*
- * This file is taken from the Linux kernel and is distributed under GPL v2.
- */
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#define USE_BSD
#include <endian.h>
#include <regex.h>
-#include <sys/types.h>
+#include <tools/le_byteshift.h>
+
+static void die(char *fmt, ...);
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
static Elf32_Ehdr ehdr;
static unsigned long reloc_count, reloc_idx;
static unsigned long *relocs;
+static unsigned long reloc16_count, reloc16_idx;
+static unsigned long *relocs16;
struct section {
Elf32_Shdr shdr;
};
static struct section *secs;
-static void die(char *fmt, ...)
-{
- va_list ap;
- va_start(ap, fmt);
- vfprintf(stderr, fmt, ap);
- va_end(ap);
- exit(1);
-}
+enum symtype {
+ S_ABS,
+ S_REL,
+ S_SEG,
+ S_LIN,
+ S_NSYMTYPES
+};
+static const char * const sym_regex_kernel[S_NSYMTYPES] = {
/*
- * Following symbols have been audited. Don't warn user about
+ * Following symbols have been audited. There values are constant and do
+ * not change if bzImage is loaded at a different physical address than
+ * the address for which it has been compiled. Don't warn user about
* absolute relocations present w.r.t these symbols.
*/
+ [S_ABS] =
+ "^(__.*_len|__.*_dwords)$",
-/* True absolute relocations */
+/*
+ * These symbols are known to be relative, even if the linker marks them
+ * as absolute (typically defined outside any section in the linker script.)
+ */
+ [S_REL] =
+ "^(__.*_start|__.*_end|_end|_[se](text|data))$",
+};
-static const char safe_abs_regex[] =
-"^(__.*_len|__.*_dwords)$";
-static regex_t safe_abs_regex_c;
-static int is_safe_abs_reloc(const char *sym_name)
-{
- return !regexec(&safe_abs_regex_c, sym_name, 0, NULL, 0);
-}
+static const char * const sym_regex_realmode[S_NSYMTYPES] = {
+/*
+ * These are 16-bit segment symbols when compiling 16-bit code.
+ */
+ [S_SEG] =
+ "^real_mode_seg$",
-/* These are relative even though the linker marks them absolute */
+/*
+ * These are offsets belonging to segments, as opposed to linear addresses,
+ * when compiling 16-bit code.
+ */
+ [S_LIN] =
+ "^pa_",
+};
-static const char safe_rel_regex[] =
-"^(__.*_start|__.*_end|_end|_[se](text|data))$";
-static regex_t safe_rel_regex_c;
+static const char * const *sym_regex;
-static int is_safe_rel_reloc(const char *sym_name)
+static regex_t sym_regex_c[S_NSYMTYPES];
+static int is_reloc(enum symtype type, const char *sym_name)
{
- return !regexec(&safe_rel_regex_c, sym_name, 0, NULL, 0);
+ return sym_regex[type] &&
+ !regexec(&sym_regex_c[type], sym_name, 0, NULL, 0);
}
-static void regex_init(void)
+static void regex_init(int use_real_mode)
{
- char errbuf[128];
- int err;
+ char errbuf[128];
+ int err;
+ int i;
- err = regcomp(&safe_abs_regex_c, safe_abs_regex,
- REG_EXTENDED|REG_NOSUB);
- if (err) {
- regerror(err, &safe_abs_regex_c, errbuf, sizeof errbuf);
- die("%s", errbuf);
- }
+ if (use_real_mode)
+ sym_regex = sym_regex_realmode;
+ else
+ sym_regex = sym_regex_kernel;
- err = regcomp(&safe_rel_regex_c, safe_rel_regex,
- REG_EXTENDED|REG_NOSUB);
- if (err) {
- regerror(err, &safe_rel_regex_c, errbuf, sizeof errbuf);
- die("%s", errbuf);
- }
+ for (i = 0; i < S_NSYMTYPES; i++) {
+ if (!sym_regex[i])
+ continue;
+
+ err = regcomp(&sym_regex_c[i], sym_regex[i],
+ REG_EXTENDED|REG_NOSUB);
+
+ if (err) {
+ regerror(err, &sym_regex_c[i], errbuf, sizeof errbuf);
+ die("%s", errbuf);
+ }
+ }
+}
+
+static void die(char *fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ exit(1);
}
static const char *sym_type(unsigned type)
REL_TYPE(R_386_RELATIVE),
REL_TYPE(R_386_GOTOFF),
REL_TYPE(R_386_GOTPC),
+ REL_TYPE(R_386_8),
+ REL_TYPE(R_386_PC8),
+ REL_TYPE(R_386_16),
+ REL_TYPE(R_386_PC16),
#undef REL_TYPE
};
- const char *name = NULL;
- if (type < ARRAY_SIZE(type_name))
+ const char *name = "unknown type rel type name";
+ if (type < ARRAY_SIZE(type_name) && type_name[type]) {
name = type_name[type];
- if (!name)
- name = "unknown";
+ }
return name;
}
name = sym_strtab + sym->st_name;
}
else {
- name = sec_name(secs[sym->st_shndx].shdr.sh_name);
+ name = sec_name(sym->st_shndx);
}
return name;
}
printf("\n");
}
-static int print_absolute_relocs(FILE *f)
+static void print_absolute_relocs(void)
{
int i, printed = 0;
* Before warning check if this absolute symbol
* relocation is harmless.
*/
- if (is_safe_abs_reloc(name) ||
- is_safe_rel_reloc(name))
+ if (is_reloc(S_ABS, name) || is_reloc(S_REL, name))
continue;
if (!printed) {
- fprintf(f, "Unknown absolute relocations present\n");
- fprintf(f, "Offset Info Type Sym.Value Sym.Name\n");
+ printf("WARNING: Absolute relocations"
+ " present\n");
+ printf("Offset Info Type Sym.Value "
+ "Sym.Name\n");
printed = 1;
}
- fprintf(f, "%08x %08x %10s %08x %s\n",
+ printf("%08x %08x %10s %08x %s\n",
rel->r_offset,
rel->r_info,
rel_type(ELF32_R_TYPE(rel->r_info)),
}
if (printed)
- fputc('\n', f);
-
- return printed;
+ printf("\n");
}
-static void walk_relocs(void (*visit)(Elf32_Rel *rel, Elf32_Sym *sym))
+static void walk_relocs(void (*visit)(Elf32_Rel *rel, Elf32_Sym *sym),
+ int use_real_mode)
{
int i;
/* Walk through the relocations */
Elf32_Rel *rel;
Elf32_Sym *sym;
unsigned r_type;
+ const char *symname;
+ int shn_abs;
+
rel = &sec->reltab[j];
sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
r_type = ELF32_R_TYPE(rel->r_info);
- /* Don't visit relocations to absolute symbols */
- if (sym->st_shndx == SHN_ABS &&
- !is_safe_rel_reloc(sym_name(sym_strtab, sym)))
- continue;
+
+ shn_abs = sym->st_shndx == SHN_ABS;
switch (r_type) {
case R_386_NONE:
case R_386_PC32:
+ case R_386_PC16:
+ case R_386_PC8:
case R_386_GOTPC:
case R_386_GOTOFF:
case R_386_GOT32:
case R_386_PLT32:
- /* Relative relocations don't need to
- be adjusted */
+ /*
+ * NONE can be ignored and and PC relative
+ * relocations don't need to be adjusted.
+ */
+ break;
+
+ case R_386_16:
+ symname = sym_name(sym_strtab, sym);
+ if (!use_real_mode)
+ goto bad;
+ if (shn_abs) {
+ if (is_reloc(S_ABS, symname))
+ break;
+ else if (!is_reloc(S_SEG, symname))
+ goto bad;
+ } else {
+ if (is_reloc(S_LIN, symname))
+ goto bad;
+ else
+ break;
+ }
+ visit(rel, sym);
break;
+
case R_386_32:
- /* Visit relocations that need adjustment */
+ symname = sym_name(sym_strtab, sym);
+ if (shn_abs) {
+ if (is_reloc(S_ABS, symname))
+ break;
+ else if (!is_reloc(S_REL, symname))
+ goto bad;
+ } else {
+ if (use_real_mode &&
+ !is_reloc(S_LIN, symname))
+ break;
+ }
visit(rel, sym);
break;
default:
die("Unsupported relocation type: %s (%d)\n",
rel_type(r_type), r_type);
+ break;
+ bad:
+ symname = sym_name(sym_strtab, sym);
+ die("Invalid %s %s relocation: %s\n",
+ shn_abs ? "absolute" : "relative",
+ rel_type(r_type), symname);
}
}
}
static void count_reloc(Elf32_Rel *rel, Elf32_Sym *sym)
{
- (void)rel; (void)sym;
- reloc_count += 1;
+ (void)sym;
+
+ if (ELF32_R_TYPE(rel->r_info) == R_386_16)
+ reloc16_count++;
+ else
+ reloc_count++;
}
static void collect_reloc(Elf32_Rel *rel, Elf32_Sym *sym)
(void)sym;
/* Remember the address that needs to be adjusted. */
- relocs[reloc_idx++] = rel->r_offset;
+ if (ELF32_R_TYPE(rel->r_info) == R_386_16)
+ relocs16[reloc16_idx++] = rel->r_offset;
+ else
+ relocs[reloc_idx++] = rel->r_offset;
}
static int cmp_relocs(const void *va, const void *vb)
return (*a == *b)? 0 : (*a > *b)? 1 : -1;
}
-static void emit_relocs(int as_text)
+static int write32(unsigned int v, FILE *f)
+{
+ unsigned char buf[4];
+
+ put_unaligned_le32(v, buf);
+ return fwrite(buf, 1, 4, f) == 4 ? 0 : -1;
+}
+
+static void emit_relocs(int as_text, int use_real_mode)
{
int i;
/* Count how many relocations I have and allocate space for them. */
reloc_count = 0;
- walk_relocs(count_reloc);
+ walk_relocs(count_reloc, use_real_mode);
relocs = malloc(reloc_count * sizeof(relocs[0]));
if (!relocs) {
die("malloc of %d entries for relocs failed\n",
reloc_count);
}
+
+ relocs16 = malloc(reloc16_count * sizeof(relocs[0]));
+ if (!relocs16) {
+ die("malloc of %d entries for relocs16 failed\n",
+ reloc16_count);
+ }
/* Collect up the relocations */
reloc_idx = 0;
- walk_relocs(collect_reloc);
+ walk_relocs(collect_reloc, use_real_mode);
+
+ if (reloc16_count && !use_real_mode)
+ die("Segment relocations found but --realmode not specified\n");
/* Order the relocations for more efficient processing */
qsort(relocs, reloc_count, sizeof(relocs[0]), cmp_relocs);
+ qsort(relocs16, reloc16_count, sizeof(relocs16[0]), cmp_relocs);
/* Print the relocations */
if (as_text) {
*/
printf(".section \".data.reloc\",\"a\"\n");
printf(".balign 4\n");
- for (i = 0; i < reloc_count; i++) {
- printf("\t .long 0x%08lx\n", relocs[i]);
+ if (use_real_mode) {
+ printf("\t.long %lu\n", reloc16_count);
+ for (i = 0; i < reloc16_count; i++)
+ printf("\t.long 0x%08lx\n", relocs16[i]);
+ printf("\t.long %lu\n", reloc_count);
+ for (i = 0; i < reloc_count; i++) {
+ printf("\t.long 0x%08lx\n", relocs[i]);
+ }
+ } else {
+ /* Print a stop */
+ printf("\t.long 0x%08lx\n", (unsigned long)0);
+ for (i = 0; i < reloc_count; i++) {
+ printf("\t.long 0x%08lx\n", relocs[i]);
+ }
}
+
printf("\n");
}
else {
- unsigned char buf[4];
- /* Now print each relocation */
- for (i = 0; i < reloc_count; i++) {
- buf[0] = (relocs[i] >> 0) & 0xff;
- buf[1] = (relocs[i] >> 8) & 0xff;
- buf[2] = (relocs[i] >> 16) & 0xff;
- buf[3] = (relocs[i] >> 24) & 0xff;
- fwrite(buf, 4, 1, stdout);
+ if (use_real_mode) {
+ write32(reloc16_count, stdout);
+ for (i = 0; i < reloc16_count; i++)
+ write32(relocs16[i], stdout);
+ write32(reloc_count, stdout);
+
+ /* Now print each relocation */
+ for (i = 0; i < reloc_count; i++)
+ write32(relocs[i], stdout);
+ } else {
+ /* Print a stop */
+ write32(0, stdout);
+
+ /* Now print each relocation */
+ for (i = 0; i < reloc_count; i++) {
+ write32(relocs[i], stdout);
+ }
}
- /* Print a stop */
- memset(buf, 0, sizeof buf);
- fwrite(buf, 4, 1, stdout);
}
}
static void usage(void)
{
- die("relocs [--abs-syms |--abs-relocs | --text] vmlinux\n");
+ die("relocs [--abs-syms|--abs-relocs|--text|--realmode] vmlinux\n");
}
int main(int argc, char **argv)
{
int show_absolute_syms, show_absolute_relocs;
- int as_text;
+ int as_text, use_real_mode;
const char *fname;
FILE *fp;
int i;
- int err = 0;
show_absolute_syms = 0;
show_absolute_relocs = 0;
as_text = 0;
+ use_real_mode = 0;
fname = NULL;
for (i = 1; i < argc; i++) {
char *arg = argv[i];
if (*arg == '-') {
- if (strcmp(argv[1], "--abs-syms") == 0) {
+ if (strcmp(arg, "--abs-syms") == 0) {
show_absolute_syms = 1;
continue;
}
-
- if (strcmp(argv[1], "--abs-relocs") == 0) {
+ if (strcmp(arg, "--abs-relocs") == 0) {
show_absolute_relocs = 1;
continue;
}
- else if (strcmp(argv[1], "--text") == 0) {
+ if (strcmp(arg, "--text") == 0) {
as_text = 1;
continue;
}
+ if (strcmp(arg, "--realmode") == 0) {
+ use_real_mode = 1;
+ continue;
+ }
}
else if (!fname) {
fname = arg;
if (!fname) {
usage();
}
-
-
- regex_init();
-
+ regex_init(use_real_mode);
fp = fopen(fname, "r");
if (!fp) {
die("Cannot open %s: %s\n",
return 0;
}
if (show_absolute_relocs) {
- print_absolute_relocs(stdout);
+ print_absolute_relocs();
return 0;
}
- err = print_absolute_relocs(stderr);
- emit_relocs(as_text);
- return err;
+ emit_relocs(as_text, use_real_mode);
+ return 0;
}
projects / platform / upstream / syslinux.git / commitdiff