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dyngen.c
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/*
* Generic Dynamic compiler generator
*
* Copyright (c) 2003 Fabrice Bellard
*
* The COFF object format support was extracted from Kazu's QEMU port
* to Win32.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <inttypes.h>
#include <unistd.h>
#include <fcntl.h>
#include "config-host.h"
/* NOTE: we test CONFIG_WIN32 instead of _WIN32 to enabled cross
compilation */
#if defined(CONFIG_WIN32)
#define CONFIG_FORMAT_COFF
#else
#define CONFIG_FORMAT_ELF
#endif
#ifdef CONFIG_FORMAT_ELF
/* 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_AMD64)
#define ELF_CLASS ELFCLASS64
#define ELF_ARCH EM_X86_64
#define elf_check_arch(x) ((x) == EM_X86_64)
#define 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
#elif defined(HOST_IA64)
#define ELF_CLASS ELFCLASS64
#define ELF_ARCH EM_IA_64
#define elf_check_arch(x) ((x) == EM_IA_64)
#define ELF_USES_RELOCA
#elif defined(HOST_SPARC)
#define ELF_CLASS ELFCLASS32
#define ELF_ARCH EM_SPARC
#define elf_check_arch(x) ((x) == EM_SPARC || (x) == EM_SPARC32PLUS)
#define ELF_USES_RELOCA
#elif defined(HOST_SPARC64)
#define ELF_CLASS ELFCLASS64
#define ELF_ARCH EM_SPARCV9
#define elf_check_arch(x) ((x) == EM_SPARCV9)
#define ELF_USES_RELOCA
#elif defined(HOST_ARM)
#define ELF_CLASS ELFCLASS32
#define ELF_ARCH EM_ARM
#define elf_check_arch(x) ((x) == EM_ARM)
#define ELF_USES_RELOC
#elif defined(HOST_M68K)
#define ELF_CLASS ELFCLASS32
#define ELF_ARCH EM_68K
#define elf_check_arch(x) ((x) == EM_68K)
#define ELF_USES_RELOCA
#else
#error unsupported CPU - please update the code
#endif
#include "elf.h"
#if ELF_CLASS == ELFCLASS32
typedef int32_t host_long;
typedef uint32_t host_ulong;
#define swabls(x) swab32s(x)
#else
typedef int64_t host_long;
typedef uint64_t host_ulong;
#define swabls(x) swab64s(x)
#endif
#ifdef ELF_USES_RELOCA
#define SHT_RELOC SHT_RELA
#else
#define SHT_RELOC SHT_REL
#endif
#define EXE_RELOC ELF_RELOC
#define EXE_SYM ElfW(Sym)
#endif /* CONFIG_FORMAT_ELF */
#ifdef CONFIG_FORMAT_COFF
#include "a.out.h"
typedef int32_t host_long;
typedef uint32_t host_ulong;
#define FILENAMELEN 256
typedef struct coff_sym {
struct external_syment *st_syment;
char st_name[FILENAMELEN];
uint32_t st_value;
int st_size;
uint8_t st_type;
uint8_t st_shndx;
} coff_Sym;
typedef struct coff_rel {
struct external_reloc *r_reloc;
int r_offset;
uint8_t r_type;
} coff_Rel;
#define EXE_RELOC struct coff_rel
#define EXE_SYM struct coff_sym
#endif /* CONFIG_FORMAT_COFF */
#include "bswap.h"
enum {
OUT_GEN_OP,
OUT_CODE,
OUT_INDEX_OP,
};
/* all dynamically generated functions begin with this code */
#define OP_PREFIX "op_"
int do_swap;
void __attribute__((noreturn)) __attribute__((format (printf, 1, 2))) error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "dyngen: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
exit(1);
}
void *load_data(int fd, long offset, unsigned int size)
{
char *data;
data = malloc(size);
if (!data)
return NULL;
lseek(fd, offset, SEEK_SET);
if (read(fd, data, size) != size) {
free(data);
return NULL;
}
return data;
}
int strstart(const char *str, const char *val, const char **ptr)
{
const char *p, *q;
p = str;
q = val;
while (*q != '\0') {
if (*p != *q)
return 0;
p++;
q++;
}
if (ptr)
*ptr = p;
return 1;
}
void pstrcpy(char *buf, int buf_size, const char *str)
{
int c;
char *q = buf;
if (buf_size <= 0)
return;
for(;;) {
c = *str++;
if (c == 0 || q >= buf + buf_size - 1)
break;
*q++ = c;
}
*q = '\0';
}
void swab16s(uint16_t *p)
{
*p = bswap16(*p);
}
void swab32s(uint32_t *p)
{
*p = bswap32(*p);
}
void swab64s(uint64_t *p)
{
*p = bswap64(*p);
}
uint16_t get16(uint16_t *p)
{
uint16_t val;
val = *p;
if (do_swap)
val = bswap16(val);
return val;
}
uint32_t get32(uint32_t *p)
{
uint32_t val;
val = *p;
if (do_swap)
val = bswap32(val);
return val;
}
void put16(uint16_t *p, uint16_t val)
{
if (do_swap)
val = bswap16(val);
*p = val;
}
void put32(uint32_t *p, uint32_t val)
{
if (do_swap)
val = bswap32(val);
*p = val;
}
/* executable information */
EXE_SYM *symtab;
int nb_syms;
int text_shndx;
uint8_t *text;
EXE_RELOC *relocs;
int nb_relocs;
#ifdef CONFIG_FORMAT_ELF
/* ELF file info */
struct elf_shdr *shdr;
uint8_t **sdata;
struct elfhdr ehdr;
char *strtab;
int elf_must_swap(struct elfhdr *h)
{
union {
uint32_t i;
uint8_t b[4];
} swaptest;
swaptest.i = 1;
return (h->e_ident[EI_DATA] == ELFDATA2MSB) !=
(swaptest.b[0] == 0);
}
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 */
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_phnum); /* Program header table entry count */
swab16s(&h-> e_shentsize); /* Section header table entry size */
swab16s(&h-> e_shnum); /* Section header table entry count */
swab16s(&h-> e_shstrndx); /* Section header string table index */
}
void elf_swap_shdr(struct elf_shdr *h)
{
swab32s(&h-> sh_name); /* Section name (string tbl index) */
swab32s(&h-> sh_type); /* Section type */
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 */
swabls(&h-> sh_addralign); /* Section alignment */
swabls(&h-> sh_entsize); /* Entry size if section holds table */
}
void elf_swap_phdr(struct elf_phdr *h)
{
swab32s(&h->p_type); /* Segment type */
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 */
swabls(&h->p_align); /* Segment alignment */
}
void elf_swap_rel(ELF_RELOC *rel)
{
swabls(&rel->r_offset);
swabls(&rel->r_info);
#ifdef ELF_USES_RELOCA
swabls(&rel->r_addend);
#endif
}
struct elf_shdr *find_elf_section(struct elf_shdr *shdr, int shnum, const char *shstr,
const char *name)
{
int i;
const char *shname;
struct elf_shdr *sec;
for(i = 0; i < shnum; i++) {
sec = &shdr[i];
if (!sec->sh_name)
continue;
shname = shstr + sec->sh_name;
if (!strcmp(shname, name))
return sec;
}
return NULL;
}
int find_reloc(int sh_index)
{
struct elf_shdr *sec;
int i;
for(i = 0; i < ehdr.e_shnum; i++) {
sec = &shdr[i];
if (sec->sh_type == SHT_RELOC && sec->sh_info == sh_index)
return i;
}
return 0;
}
static char *get_rel_sym_name(EXE_RELOC *rel)
{
return strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
}
static char *get_sym_name(EXE_SYM *sym)
{
return strtab + sym->st_name;
}
/* load an elf object file */
int load_object(const char *filename)
{
int fd;
struct elf_shdr *sec, *symtab_sec, *strtab_sec, *text_sec;
int i, j;
ElfW(Sym) *sym;
char *shstr;
ELF_RELOC *rel;
fd = open(filename, O_RDONLY);
if (fd < 0)
error("can't open file '%s'", filename);
/* Read ELF header. */
if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
error("unable to read file header");
/* Check ELF identification. */
if (ehdr.e_ident[EI_MAG0] != ELFMAG0
|| ehdr.e_ident[EI_MAG1] != ELFMAG1
|| ehdr.e_ident[EI_MAG2] != ELFMAG2
|| ehdr.e_ident[EI_MAG3] != ELFMAG3
|| 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");
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(struct elf_shdr));
if (do_swap) {
for(i = 0; i < ehdr.e_shnum; i++) {
elf_swap_shdr(&shdr[i]);
}
}
/* read all section data */
sdata = malloc(sizeof(void *) * ehdr.e_shnum);
memset(sdata, 0, sizeof(void *) * ehdr.e_shnum);
for(i = 0;i < ehdr.e_shnum; i++) {
sec = &shdr[i];
if (sec->sh_type != SHT_NOBITS)
sdata[i] = load_data(fd, sec->sh_offset, sec->sh_size);
}
sec = &shdr[ehdr.e_shstrndx];
shstr = sdata[ehdr.e_shstrndx];
/* swap relocations */
for(i = 0; i < ehdr.e_shnum; i++) {
sec = &shdr[i];
if (sec->sh_type == SHT_RELOC) {
nb_relocs = sec->sh_size / sec->sh_entsize;
if (do_swap) {
for(j = 0, rel = (ELF_RELOC *)sdata[i]; j < nb_relocs; j++, rel++)
elf_swap_rel(rel);
}
}
}
/* text section */
text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
if (!text_sec)
error("could not find .text section");
text_shndx = text_sec - shdr;
text = sdata[text_shndx];
/* find text relocations, if any */
relocs = NULL;
nb_relocs = 0;
i = find_reloc(text_shndx);
if (i != 0) {
relocs = (ELF_RELOC *)sdata[i];
nb_relocs = shdr[i].sh_size / shdr[i].sh_entsize;
}
symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
if (!symtab_sec)
error("could not find .symtab section");
strtab_sec = &shdr[symtab_sec->sh_link];
symtab = (ElfW(Sym) *)sdata[symtab_sec - shdr];
strtab = sdata[symtab_sec->sh_link];
nb_syms = symtab_sec->sh_size / sizeof(ElfW(Sym));
if (do_swap) {
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
swab32s(&sym->st_name);
swabls(&sym->st_value);
swabls(&sym->st_size);
swab16s(&sym->st_shndx);
}
}
close(fd);
return 0;
}
#endif /* CONFIG_FORMAT_ELF */
#ifdef CONFIG_FORMAT_COFF
/* COFF file info */
struct external_scnhdr *shdr;
uint8_t **sdata;
struct external_filehdr fhdr;
struct external_syment *coff_symtab;
char *strtab;
int coff_text_shndx, coff_data_shndx;
int data_shndx;
#define STRTAB_SIZE 4
#define DIR32 0x06
#define DISP32 0x14
#define T_FUNCTION 0x20
#define C_EXTERNAL 2
void sym_ent_name(struct external_syment *ext_sym, EXE_SYM *sym)
{
char *q;
int c, i, len;
if (ext_sym->e.e.e_zeroes != 0) {
q = sym->st_name;
for(i = 0; i < 8; i++) {
c = ext_sym->e.e_name[i];
if (c == '\0')
break;
*q++ = c;
}
*q = '\0';
} else {
pstrcpy(sym->st_name, sizeof(sym->st_name), strtab + ext_sym->e.e.e_offset);
}
/* now convert the name to a C name (suppress the leading '_') */
if (sym->st_name[0] == '_') {
len = strlen(sym->st_name);
memmove(sym->st_name, sym->st_name + 1, len - 1);
sym->st_name[len - 1] = '\0';
}
}
char *name_for_dotdata(struct coff_rel *rel)
{
int i;
struct coff_sym *sym;
uint32_t text_data;
text_data = *(uint32_t *)(text + rel->r_offset);
for (i = 0, sym = symtab; i < nb_syms; i++, sym++) {
if (sym->st_syment->e_scnum == data_shndx &&
text_data >= sym->st_value &&
text_data < sym->st_value + sym->st_size) {
return sym->st_name;
}
}
return NULL;
}
static char *get_sym_name(EXE_SYM *sym)
{
return sym->st_name;
}
static char *get_rel_sym_name(EXE_RELOC *rel)
{
char *name;
name = get_sym_name(symtab + *(uint32_t *)(rel->r_reloc->r_symndx));
if (!strcmp(name, ".data"))
name = name_for_dotdata(rel);
return name;
}
struct external_scnhdr *find_coff_section(struct external_scnhdr *shdr, int shnum, const char *name)
{
int i;
const char *shname;
struct external_scnhdr *sec;
for(i = 0; i < shnum; i++) {
sec = &shdr[i];
if (!sec->s_name)
continue;
shname = sec->s_name;
if (!strcmp(shname, name))
return sec;
}
return NULL;
}
/* load a coff object file */
int load_object(const char *filename)
{
int fd;
struct external_scnhdr *sec, *text_sec, *data_sec;
int i;
struct external_syment *ext_sym;
struct external_reloc *coff_relocs;
struct external_reloc *ext_rel;
uint32_t *n_strtab;
EXE_SYM *sym;
EXE_RELOC *rel;
fd = open(filename, O_RDONLY
#ifdef _WIN32
| O_BINARY
#endif
);
if (fd < 0)
error("can't open file '%s'", filename);
/* Read COFF header. */
if (read(fd, &fhdr, sizeof (fhdr)) != sizeof (fhdr))
error("unable to read file header");
/* Check COFF identification. */
if (fhdr.f_magic != I386MAGIC) {
error("bad COFF header");
}
do_swap = 0;
/* read section headers */
shdr = load_data(fd, sizeof(struct external_filehdr) + fhdr.f_opthdr, fhdr.f_nscns * sizeof(struct external_scnhdr));
/* read all section data */
sdata = malloc(sizeof(void *) * fhdr.f_nscns);
memset(sdata, 0, sizeof(void *) * fhdr.f_nscns);
const char *p;
for(i = 0;i < fhdr.f_nscns; i++) {
sec = &shdr[i];
if (!strstart(sec->s_name, ".bss", &p))
sdata[i] = load_data(fd, sec->s_scnptr, sec->s_size);
}
/* text section */
text_sec = find_coff_section(shdr, fhdr.f_nscns, ".text");
if (!text_sec)
error("could not find .text section");
coff_text_shndx = text_sec - shdr;
text = sdata[coff_text_shndx];
/* data section */
data_sec = find_coff_section(shdr, fhdr.f_nscns, ".data");
if (!data_sec)
error("could not find .data section");
coff_data_shndx = data_sec - shdr;
coff_symtab = load_data(fd, fhdr.f_symptr, fhdr.f_nsyms*SYMESZ);
for (i = 0, ext_sym = coff_symtab; i < nb_syms; i++, ext_sym++) {
for(i=0;i<8;i++)
printf(" %02x", ((uint8_t *)ext_sym->e.e_name)[i]);
printf("\n");
}
n_strtab = load_data(fd, (fhdr.f_symptr + fhdr.f_nsyms*SYMESZ), STRTAB_SIZE);
strtab = load_data(fd, (fhdr.f_symptr + fhdr.f_nsyms*SYMESZ), *n_strtab);
nb_syms = fhdr.f_nsyms;
for (i = 0, ext_sym = coff_symtab; i < nb_syms; i++, ext_sym++) {
if (strstart(ext_sym->e.e_name, ".text", NULL))
text_shndx = ext_sym->e_scnum;
if (strstart(ext_sym->e.e_name, ".data", NULL))
data_shndx = ext_sym->e_scnum;
}
/* set coff symbol */
symtab = malloc(sizeof(struct coff_sym) * nb_syms);
int aux_size, j;
for (i = 0, ext_sym = coff_symtab, sym = symtab; i < nb_syms; i++, ext_sym++, sym++) {
memset(sym, 0, sizeof(*sym));
sym->st_syment = ext_sym;
sym_ent_name(ext_sym, sym);
sym->st_value = ext_sym->e_value;
aux_size = *(int8_t *)ext_sym->e_numaux;
if (ext_sym->e_scnum == text_shndx && ext_sym->e_type == T_FUNCTION) {
for (j = aux_size + 1; j < nb_syms - i; j++) {
if ((ext_sym + j)->e_scnum == text_shndx &&
(ext_sym + j)->e_type == T_FUNCTION ){
sym->st_size = (ext_sym + j)->e_value - ext_sym->e_value;
break;
} else if (j == nb_syms - i - 1) {
sec = &shdr[coff_text_shndx];
sym->st_size = sec->s_size - ext_sym->e_value;
break;
}
}
} else if (ext_sym->e_scnum == data_shndx && *(uint8_t *)ext_sym->e_sclass == C_EXTERNAL) {
for (j = aux_size + 1; j < nb_syms - i; j++) {
if ((ext_sym + j)->e_scnum == data_shndx) {
sym->st_size = (ext_sym + j)->e_value - ext_sym->e_value;
break;
} else if (j == nb_syms - i - 1) {
sec = &shdr[coff_data_shndx];
sym->st_size = sec->s_size - ext_sym->e_value;
break;
}
}
} else {
sym->st_size = 0;
}
sym->st_type = ext_sym->e_type;
sym->st_shndx = ext_sym->e_scnum;
}
/* find text relocations, if any */
sec = &shdr[coff_text_shndx];
coff_relocs = load_data(fd, sec->s_relptr, sec->s_nreloc*RELSZ);
nb_relocs = sec->s_nreloc;
/* set coff relocation */
relocs = malloc(sizeof(struct coff_rel) * nb_relocs);
for (i = 0, ext_rel = coff_relocs, rel = relocs; i < nb_relocs;
i++, ext_rel++, rel++) {
memset(rel, 0, sizeof(*rel));
rel->r_reloc = ext_rel;
rel->r_offset = *(uint32_t *)ext_rel->r_vaddr;
rel->r_type = *(uint16_t *)ext_rel->r_type;
}
return 0;
}
#endif /* CONFIG_FORMAT_COFF */
#ifdef HOST_ARM
int arm_emit_ldr_info(const char *name, unsigned long start_offset,
FILE *outfile, uint8_t *p_start, uint8_t *p_end,
ELF_RELOC *relocs, int nb_relocs)
{
uint8_t *p;
uint32_t insn;
int offset, min_offset, pc_offset, data_size;
uint8_t data_allocated[1024];
unsigned int data_index;
memset(data_allocated, 0, sizeof(data_allocated));
p = p_start;
min_offset = p_end - p_start;
while (p < p_start + min_offset) {
insn = get32((uint32_t *)p);
if ((insn & 0x0d5f0000) == 0x051f0000) {
/* ldr reg, [pc, #im] */
offset = insn & 0xfff;
if (!(insn & 0x00800000))
offset = -offset;
if ((offset & 3) !=0)
error("%s:%04x: ldr pc offset must be 32 bit aligned",
name, start_offset + p - p_start);
pc_offset = p - p_start + offset + 8;
if (pc_offset <= (p - p_start) ||
pc_offset >= (p_end - p_start))
error("%s:%04x: ldr pc offset must point inside the function code",
name, start_offset + p - p_start);
if (pc_offset < min_offset)
min_offset = pc_offset;
if (outfile) {
/* ldr position */
fprintf(outfile, " arm_ldr_ptr->ptr = gen_code_ptr + %d;\n",
p - p_start);
/* ldr data index */
data_index = ((p_end - p_start) - pc_offset - 4) >> 2;
fprintf(outfile, " arm_ldr_ptr->data_ptr = arm_data_ptr + %d;\n",
data_index);
fprintf(outfile, " arm_ldr_ptr++;\n");
if (data_index >= sizeof(data_allocated))
error("%s: too many data", name);
if (!data_allocated[data_index]) {
ELF_RELOC *rel;
int i, addend, type;
const char *sym_name, *p;
char relname[1024];
data_allocated[data_index] = 1;
/* data value */
addend = get32((uint32_t *)(p_start + pc_offset));
relname[0] = '\0';
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
if (rel->r_offset == (pc_offset + start_offset)) {
sym_name = get_rel_sym_name(rel);
/* the compiler leave some unnecessary references to the code */
if (strstart(sym_name, "__op_param", &p)) {
snprintf(relname, sizeof(relname), "param%s", p);
} else {
snprintf(relname, sizeof(relname), "(long)(&%s)", sym_name);
}
type = ELF32_R_TYPE(rel->r_info);
if (type != R_ARM_ABS32)
error("%s: unsupported data relocation", name);
break;
}
}
fprintf(outfile, " arm_data_ptr[%d] = 0x%x",
data_index, addend);
if (relname[0] != '\0')
fprintf(outfile, " + %s", relname);
fprintf(outfile, ";\n");
}
}
}
p += 4;
}
data_size = (p_end - p_start) - min_offset;
if (data_size > 0 && outfile) {
fprintf(outfile, " arm_data_ptr += %d;\n", data_size >> 2);
}
/* the last instruction must be a mov pc, lr */
if (p == p_start)
goto arm_ret_error;
p -= 4;
insn = get32((uint32_t *)p);
if ((insn & 0xffff0000) != 0xe91b0000) {
arm_ret_error:
if (!outfile)
printf("%s: invalid epilog\n", name);
}
return p - p_start;
}
#endif
#define MAX_ARGS 3
/* generate op code */
void gen_code(const char *name, host_ulong offset, host_ulong size,
FILE *outfile, int gen_switch)
{
int copy_size = 0;
uint8_t *p_start, *p_end;
host_ulong start_offset;
int nb_args, i, n;
uint8_t args_present[MAX_ARGS];
const char *sym_name, *p;
EXE_RELOC *rel;
/* Compute exact size excluding prologue and epilogue instructions.
* Increment start_offset to skip epilogue instructions, then compute
* copy_size the indicate the size of the remaining instructions (in
* bytes).
*/
p_start = text + offset;
p_end = p_start + size;
start_offset = offset;
#if defined(HOST_I386) || defined(HOST_AMD64)
#ifdef CONFIG_FORMAT_COFF
{
uint8_t *p;
p = p_end - 1;
if (p == p_start)
error("empty code for %s", name);
while (*p != 0xc3) {
p--;
if (p <= p_start)
error("ret or jmp expected at the end of %s", name);
}
copy_size = p - p_start;
}
#else
{
int len;
len = p_end - p_start;
if (len == 0)
error("empty code for %s", name);
if (p_end[-1] == 0xc3) {
len--;
} else {
error("ret or jmp expected at the end of %s", name);
}
copy_size = len;
}
#endif
#elif defined(HOST_PPC)
{
uint8_t *p;
p = (void *)(p_end - 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;
}
#elif defined(HOST_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;
}
#elif defined(HOST_ALPHA)
{
uint8_t *p;
p = p_end - 4;
#if 0
/* XXX: check why it occurs */
if (p == p_start)
error("empty code for %s", name);
#endif
if (get32((uint32_t *)p) != 0x6bfa8001)
error("ret expected at the end of %s", name);
copy_size = p - p_start;
}
#elif defined(HOST_IA64)
{
uint8_t *p;
p = (void *)(p_end - 4);
if (p == p_start)
error("empty code for %s", name);
/* br.ret.sptk.many b0;; */
/* 08 00 84 00 */
if (get32((uint32_t *)p) != 0x00840008)
error("br.ret.sptk.many b0;; expected at the end of %s", name);
copy_size = p - p_start;
}
#elif defined(HOST_SPARC)
{
uint32_t start_insn, end_insn1, end_insn2;
uint8_t *p;
p = (void *)(p_end - 8);
if (p <= p_start)
error("empty code for %s", name);
start_insn = get32((uint32_t *)(p_start + 0x0));
end_insn1 = get32((uint32_t *)(p + 0x0));
end_insn2 = get32((uint32_t *)(p + 0x4));
if ((start_insn & ~0x1fff) == 0x9de3a000) {
p_start += 0x4;
start_offset += 0x4;
if ((int)(start_insn | ~0x1fff) < -128)
error("Found bogus save at the start of %s", name);
if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
error("ret; restore; not found at end of %s", name);
} else {
error("No save at the beginning of %s", name);
}
#if 0
/* Skip a preceeding nop, if present. */
if (p > p_start) {
skip_insn = get32((uint32_t *)(p - 0x4));
if (skip_insn == 0x01000000)
p -= 4;
}
#endif
copy_size = p - p_start;
}
#elif defined(HOST_SPARC64)
{
uint32_t start_insn, end_insn1, end_insn2, skip_insn;
uint8_t *p;
p = (void *)(p_end - 8);
if (p <= p_start)
error("empty code for %s", name);
start_insn = get32((uint32_t *)(p_start + 0x0));
end_insn1 = get32((uint32_t *)(p + 0x0));
end_insn2 = get32((uint32_t *)(p + 0x4));
if ((start_insn & ~0x1fff) == 0x9de3a000) {
p_start += 0x4;
start_offset += 0x4;
if ((int)(start_insn | ~0x1fff) < -256)
error("Found bogus save at the start of %s", name);