*/
#include <stdlib.h>
#include <stdio.h>
+#include <string.h>
#include <stdarg.h>
#include <inttypes.h>
-#include <elf.h>
#include <unistd.h>
#include <fcntl.h>
+#include "config.h"
+
+/* elf format definitions. We use these macros to test the CPU to
+ allow cross compilation (this tool must be ran on the build
+ platform) */
+#if defined(HOST_I386)
+
+#define ELF_CLASS ELFCLASS32
+#define ELF_ARCH EM_386
+#define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
+#undef ELF_USES_RELOCA
+
+#elif defined(HOST_PPC)
+
+#define ELF_CLASS ELFCLASS32
+#define ELF_ARCH EM_PPC
+#define elf_check_arch(x) ((x) == EM_PPC)
+#define ELF_USES_RELOCA
+
+#elif defined(HOST_S390)
+
+#define ELF_CLASS ELFCLASS32
+#define ELF_ARCH EM_S390
+#define elf_check_arch(x) ((x) == EM_S390)
+#define ELF_USES_RELOCA
+
+#elif defined(HOST_ALPHA)
+
+#define ELF_CLASS ELFCLASS64
+#define ELF_ARCH EM_ALPHA
+#define elf_check_arch(x) ((x) == EM_ALPHA)
+#define ELF_USES_RELOCA
+
+#else
+#error unsupported CPU - please update the code
+#endif
+
+#if ELF_CLASS == ELFCLASS32
+typedef int32_t host_long;
+typedef uint32_t host_ulong;
+#else
+typedef int64_t host_long;
+typedef uint64_t host_ulong;
+#endif
+
+#include "elf.h"
+
#include "thunk.h"
/* all dynamically generated functions begin with this code */
#define OP_PREFIX "op_"
-int elf_must_swap(Elf32_Ehdr *h)
+int elf_must_swap(struct elfhdr *h)
{
union {
uint32_t i;
*p = bswap32(*p);
}
-void swab64s(uint32_t *p)
+void swab64s(uint64_t *p)
{
*p = bswap64(*p);
}
-void elf_swap_ehdr(Elf32_Ehdr *h)
+#if ELF_CLASS == ELFCLASS32
+#define swabls(x) swab32s(x)
+#else
+#define swabls(x) swab64s(x)
+#endif
+
+void elf_swap_ehdr(struct elfhdr *h)
{
swab16s(&h->e_type); /* Object file type */
swab16s(&h-> e_machine); /* Architecture */
swab32s(&h-> e_version); /* Object file version */
- swab32s(&h-> e_entry); /* Entry point virtual address */
- swab32s(&h-> e_phoff); /* Program header table file offset */
- swab32s(&h-> e_shoff); /* Section header table file offset */
+ swabls(&h-> e_entry); /* Entry point virtual address */
+ swabls(&h-> e_phoff); /* Program header table file offset */
+ swabls(&h-> e_shoff); /* Section header table file offset */
swab32s(&h-> e_flags); /* Processor-specific flags */
swab16s(&h-> e_ehsize); /* ELF header size in bytes */
swab16s(&h-> e_phentsize); /* Program header table entry size */
swab16s(&h-> e_shstrndx); /* Section header string table index */
}
-void elf_swap_shdr(Elf32_Shdr *h)
+void elf_swap_shdr(struct elf_shdr *h)
{
swab32s(&h-> sh_name); /* Section name (string tbl index) */
swab32s(&h-> sh_type); /* Section type */
- swab32s(&h-> sh_flags); /* Section flags */
- swab32s(&h-> sh_addr); /* Section virtual addr at execution */
- swab32s(&h-> sh_offset); /* Section file offset */
- swab32s(&h-> sh_size); /* Section size in bytes */
+ swabls(&h-> sh_flags); /* Section flags */
+ swabls(&h-> sh_addr); /* Section virtual addr at execution */
+ swabls(&h-> sh_offset); /* Section file offset */
+ swabls(&h-> sh_size); /* Section size in bytes */
swab32s(&h-> sh_link); /* Link to another section */
swab32s(&h-> sh_info); /* Additional section information */
- swab32s(&h-> sh_addralign); /* Section alignment */
- swab32s(&h-> sh_entsize); /* Entry size if section holds table */
+ swabls(&h-> sh_addralign); /* Section alignment */
+ swabls(&h-> sh_entsize); /* Entry size if section holds table */
}
-void elf_swap_phdr(Elf32_Phdr *h)
+void elf_swap_phdr(struct elf_phdr *h)
{
swab32s(&h->p_type); /* Segment type */
- swab32s(&h->p_offset); /* Segment file offset */
- swab32s(&h->p_vaddr); /* Segment virtual address */
- swab32s(&h->p_paddr); /* Segment physical address */
- swab32s(&h->p_filesz); /* Segment size in file */
- swab32s(&h->p_memsz); /* Segment size in memory */
+ swabls(&h->p_offset); /* Segment file offset */
+ swabls(&h->p_vaddr); /* Segment virtual address */
+ swabls(&h->p_paddr); /* Segment physical address */
+ swabls(&h->p_filesz); /* Segment size in file */
+ swabls(&h->p_memsz); /* Segment size in memory */
swab32s(&h->p_flags); /* Segment flags */
- swab32s(&h->p_align); /* Segment alignment */
+ swabls(&h->p_align); /* Segment alignment */
}
int do_swap;
-int e_machine;
uint16_t get16(uint16_t *p)
{
}
-Elf32_Shdr *find_elf_section(Elf32_Shdr *shdr, int shnum, const char *shstr,
- const char *name)
+struct elf_shdr *find_elf_section(struct elf_shdr *shdr, int shnum, const char *shstr,
+ const char *name)
{
int i;
const char *shname;
- Elf32_Shdr *sec;
+ struct elf_shdr *sec;
for(i = 0; i < shnum; i++) {
sec = &shdr[i];
#define MAX_ARGS 3
/* generate op code */
-void gen_code(const char *name, unsigned long offset, unsigned long size,
- FILE *outfile, uint8_t *text, void *relocs, int nb_relocs, int reloc_sh_type,
- Elf32_Sym *symtab, char *strtab, int gen_switch)
+void gen_code(const char *name, host_ulong offset, host_ulong size,
+ FILE *outfile, uint8_t *text, ELF_RELOC *relocs, int nb_relocs, int reloc_sh_type,
+ ElfW(Sym) *symtab, char *strtab, int gen_switch)
{
int copy_size = 0;
uint8_t *p_start, *p_end;
- int nb_args, i;
+ int nb_args, i, n;
uint8_t args_present[MAX_ARGS];
const char *sym_name, *p;
+ ELF_RELOC *rel;
/* compute exact size excluding return instruction */
p_start = text + offset;
p_end = p_start + size;
- switch(e_machine) {
+ switch(ELF_ARCH) {
case EM_386:
{
uint8_t *p;
{
uint8_t *p;
p = (void *)(p_end - 4);
- /* find ret */
- while (p > p_start && get32((uint32_t *)p) != 0x4e800020)
- p -= 4;
- /* skip double ret */
- if (p > p_start && get32((uint32_t *)(p - 4)) == 0x4e800020)
- p -= 4;
if (p == p_start)
error("empty code for %s", name);
+ if (get32((uint32_t *)p) != 0x4e800020)
+ error("blr expected at the end of %s", name);
copy_size = p - p_start;
}
break;
- default:
- error("unsupported CPU (%d)", e_machine);
+ case EM_S390:
+ {
+ uint8_t *p;
+ p = (void *)(p_end - 2);
+ if (p == p_start)
+ error("empty code for %s", name);
+ if (get16((uint16_t *)p) != 0x07fe && get16((uint16_t *)p) != 0x07f4)
+ error("br %r14 expected at the end of %s", name);
+ copy_size = p - p_start;
+ }
+ break;
}
/* compute the number of arguments by looking at the relocations */
for(i = 0;i < MAX_ARGS; i++)
args_present[i] = 0;
- if (reloc_sh_type == SHT_REL) {
- Elf32_Rel *rel;
- int n;
- for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
- if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
- sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
- if (strstart(sym_name, "__op_param", &p)) {
- n = strtoul(p, NULL, 10);
- if (n >= MAX_ARGS)
- error("too many arguments in %s", name);
- args_present[n - 1] = 1;
- }
- }
- }
- } else {
- Elf32_Rela *rel;
- int n;
- for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
- if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
- sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
- if (strstart(sym_name, "__op_param", &p)) {
- n = strtoul(p, NULL, 10);
- if (n >= MAX_ARGS)
- error("too many arguments in %s", name);
- args_present[n - 1] = 1;
- }
+ for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
+ if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
+ sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
+ if (strstart(sym_name, "__op_param", &p)) {
+ n = strtoul(p, NULL, 10);
+ if (n >= MAX_ARGS)
+ error("too many arguments in %s", name);
+ args_present[n - 1] = 1;
}
}
}
error("inconsistent argument numbering in %s", name);
}
- if (gen_switch) {
+ if (gen_switch == 2) {
+ fprintf(outfile, "DEF(%s, %d)\n", name + 3, nb_args);
+ } else if (gen_switch == 1) {
/* output C code */
fprintf(outfile, "case INDEX_%s: {\n", name);
}
fprintf(outfile, " extern void %s();\n", name);
- if (reloc_sh_type == SHT_REL) {
- Elf32_Rel *rel;
- for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
- if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
- sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
- if (!strstart(sym_name, "__op_param", &p)) {
- fprintf(outfile, "extern char %s;\n", sym_name);
- }
- }
- }
- } else {
- Elf32_Rela *rel;
- for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
- if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
- sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
- if (!strstart(sym_name, "__op_param", &p)) {
- fprintf(outfile, "extern char %s;\n", sym_name);
- }
+ for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
+ if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
+ sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
+ if (!strstart(sym_name, "__op_param", &p)) {
+ fprintf(outfile, "extern char %s;\n", sym_name);
}
}
}
}
/* patch relocations */
- switch(e_machine) {
- case EM_386:
+#if defined(HOST_I386)
{
- Elf32_Rel *rel;
char name[256];
int type;
- long addend;
+ int addend;
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
addend = get32((uint32_t *)(text + rel->r_offset));
switch(type) {
case R_386_32:
- fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %ld) = %s + %ld;\n",
+ fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
rel->r_offset - offset, name, addend);
break;
case R_386_PC32:
- fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %ld) = %s - (long)(gen_code_ptr + %ld) + %ld;\n",
+ fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
rel->r_offset - offset, name, rel->r_offset - offset, addend);
break;
default:
}
}
}
- break;
- default:
- error("unsupported CPU for relocations (%d)", e_machine);
- }
+#elif defined(HOST_PPC)
+ {
+ char name[256];
+ int type;
+ int addend;
+ for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
+ if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
+ sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
+ if (strstart(sym_name, "__op_param", &p)) {
+ snprintf(name, sizeof(name), "param%s", p);
+ } else {
+ snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
+ }
+ type = ELF32_R_TYPE(rel->r_info);
+ addend = rel->r_addend;
+ switch(type) {
+ case R_PPC_ADDR32:
+ fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
+ rel->r_offset - offset, name, addend);
+ break;
+ case R_PPC_ADDR16_LO:
+ fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
+ rel->r_offset - offset, name, addend);
+ break;
+ case R_PPC_ADDR16_HI:
+ fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
+ rel->r_offset - offset, name, addend);
+ break;
+ case R_PPC_ADDR16_HA:
+ fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
+ rel->r_offset - offset, name, addend);
+ break;
+ case R_PPC_REL24:
+ /* warning: must be at 32 MB distancy */
+ fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
+ rel->r_offset - offset, rel->r_offset - offset, name, rel->r_offset - offset, addend);
+ break;
+ default:
+ error("unsupported powerpc relocation (%d)", type);
+ }
+ }
+ }
+ }
+#elif defined(HOST_S390)
+ {
+ char name[256];
+ int type;
+ int addend;
+ for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
+ if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
+ sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
+ if (strstart(sym_name, "__op_param", &p)) {
+ snprintf(name, sizeof(name), "param%s", p);
+ } else {
+ snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
+ }
+ type = ELF32_R_TYPE(rel->r_info);
+ addend = rel->r_addend;
+ switch(type) {
+ case R_390_32:
+ fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
+ rel->r_offset - offset, name, addend);
+ break;
+ case R_390_16:
+ fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
+ rel->r_offset - offset, name, addend);
+ break;
+ case R_390_8:
+ fprintf(outfile, " *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
+ rel->r_offset - offset, name, addend);
+ break;
+ default:
+ error("unsupported s390 relocation (%d)", type);
+ }
+ }
+ }
+ }
+#else
+#error unsupported CPU
+#endif
fprintf(outfile, " gen_code_ptr += %d;\n", copy_size);
fprintf(outfile, "}\n");
fprintf(outfile, "break;\n\n");
int load_elf(const char *filename, FILE *outfile, int do_print_enum)
{
int fd;
- Elf32_Ehdr ehdr;
- Elf32_Shdr *sec, *shdr, *symtab_sec, *strtab_sec, *text_sec;
+ struct elfhdr ehdr;
+ struct elf_shdr *sec, *shdr, *symtab_sec, *strtab_sec, *text_sec;
int i, j, nb_syms;
- Elf32_Sym *symtab, *sym;
- const char *cpu_name;
+ ElfW(Sym) *symtab, *sym;
char *shstr, *strtab;
uint8_t *text;
void *relocs;
|| ehdr.e_ident[EI_MAG1] != ELFMAG1
|| ehdr.e_ident[EI_MAG2] != ELFMAG2
|| ehdr.e_ident[EI_MAG3] != ELFMAG3
- || ehdr.e_ident[EI_CLASS] != ELFCLASS32
|| ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
error("bad ELF header");
}
do_swap = elf_must_swap(&ehdr);
if (do_swap)
elf_swap_ehdr(&ehdr);
+ if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
+ error("Unsupported ELF class");
if (ehdr.e_type != ET_REL)
error("ELF object file expected");
if (ehdr.e_version != EV_CURRENT)
error("Invalid ELF version");
- e_machine = ehdr.e_machine;
+ if (!elf_check_arch(ehdr.e_machine))
+ error("Unsupported CPU (e_machine=%d)", ehdr.e_machine);
/* read section headers */
- shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(Elf32_Shdr));
+ shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr));
if (do_swap) {
for(i = 0; i < ehdr.e_shnum; i++) {
elf_swap_shdr(&shdr[i]);
if (do_swap) {
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
swab32s(&sym->st_name);
- swab32s(&sym->st_value);
- swab32s(&sym->st_size);
+ swabls(&sym->st_value);
+ swabls(&sym->st_size);
swab16s(&sym->st_shndx);
}
}
- switch(e_machine) {
- case EM_386:
- cpu_name = "i386";
- break;
- case EM_PPC:
- cpu_name = "ppc";
- break;
- case EM_MIPS:
- cpu_name = "mips";
- break;
- case EM_ARM:
- cpu_name = "arm";
- break;
- case EM_SPARC:
- cpu_name = "sparc";
- break;
- default:
- error("unsupported CPU (e_machine=%d)", e_machine);
- }
-
if (do_print_enum) {
- fprintf(outfile, "DEF(end)\n");
+ fprintf(outfile, "DEF(end, 0)\n");
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
const char *name, *p;
name = strtab + sym->st_name;
if (strstart(name, OP_PREFIX, &p)) {
- fprintf(outfile, "DEF(%s)\n", p);
+ gen_code(name, sym->st_value, sym->st_size, outfile,
+ text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 2);
}
}
} else {
);
/* generate a return */
- switch(e_machine) {
+ switch(ELF_ARCH) {
case EM_386:
fprintf(outfile, "*gen_code_ptr++ = 0xc3; /* ret */\n");
break;
- default:
- error("no return generation for cpu '%s'", cpu_name);
+ case EM_PPC:
+ fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
+ break;
+ case EM_S390:
+ fprintf(outfile, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n");
+ break;
}
fprintf(outfile, "return gen_code_ptr - gen_code_buf;\n");
projects / qemu / blobdiff