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/*
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* Generic Dynamic compiler generator
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <stdarg.h> |
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#include <inttypes.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include "config.h" |
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/* elf format definitions. We use these macros to test the CPU to
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allow cross compilation (this tool must be ran on the build
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platform) */
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#if defined(HOST_I386)
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#define ELF_CLASS ELFCLASS32
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#define ELF_ARCH EM_386
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#define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
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#undef ELF_USES_RELOCA
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#elif defined(HOST_PPC)
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#define ELF_CLASS ELFCLASS32
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#define ELF_ARCH EM_PPC
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#define elf_check_arch(x) ((x) == EM_PPC)
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#define ELF_USES_RELOCA
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#elif defined(HOST_S390)
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#define ELF_CLASS ELFCLASS32
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#define ELF_ARCH EM_S390
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#define elf_check_arch(x) ((x) == EM_S390)
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#define ELF_USES_RELOCA
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#elif defined(HOST_ALPHA)
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#define ELF_CLASS ELFCLASS64
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#define ELF_ARCH EM_ALPHA
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#define elf_check_arch(x) ((x) == EM_ALPHA)
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#define ELF_USES_RELOCA
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#else
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#error unsupported CPU - please update the code
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#endif
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#if ELF_CLASS == ELFCLASS32
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typedef int32_t host_long;
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typedef uint32_t host_ulong;
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#else
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typedef int64_t host_long;
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typedef uint64_t host_ulong;
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#endif
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#include "elf.h" |
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#include "thunk.h" |
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/* all dynamically generated functions begin with this code */
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#define OP_PREFIX "op_" |
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int elf_must_swap(struct elfhdr *h) |
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{
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union {
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uint32_t i; |
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uint8_t b[4];
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} swaptest; |
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swaptest.i = 1;
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return (h->e_ident[EI_DATA] == ELFDATA2MSB) !=
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(swaptest.b[0] == 0); |
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} |
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void swab16s(uint16_t *p)
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{
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*p = bswap16(*p); |
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} |
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void swab32s(uint32_t *p)
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{
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*p = bswap32(*p); |
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} |
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void swab64s(uint64_t *p)
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{
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*p = bswap64(*p); |
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} |
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#if ELF_CLASS == ELFCLASS32
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#define swabls(x) swab32s(x)
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#else
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#define swabls(x) swab64s(x)
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#endif
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void elf_swap_ehdr(struct elfhdr *h) |
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{
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swab16s(&h->e_type); /* Object file type */
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swab16s(&h-> e_machine); /* Architecture */
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swab32s(&h-> e_version); /* Object file version */
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swabls(&h-> e_entry); /* Entry point virtual address */
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swabls(&h-> e_phoff); /* Program header table file offset */
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swabls(&h-> e_shoff); /* Section header table file offset */
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swab32s(&h-> e_flags); /* Processor-specific flags */
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swab16s(&h-> e_ehsize); /* ELF header size in bytes */
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swab16s(&h-> e_phentsize); /* Program header table entry size */
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swab16s(&h-> e_phnum); /* Program header table entry count */
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swab16s(&h-> e_shentsize); /* Section header table entry size */
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swab16s(&h-> e_shnum); /* Section header table entry count */
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swab16s(&h-> e_shstrndx); /* Section header string table index */
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} |
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void elf_swap_shdr(struct elf_shdr *h) |
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{
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swab32s(&h-> sh_name); /* Section name (string tbl index) */
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swab32s(&h-> sh_type); /* Section type */
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swabls(&h-> sh_flags); /* Section flags */
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swabls(&h-> sh_addr); /* Section virtual addr at execution */
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swabls(&h-> sh_offset); /* Section file offset */
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swabls(&h-> sh_size); /* Section size in bytes */
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swab32s(&h-> sh_link); /* Link to another section */
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swab32s(&h-> sh_info); /* Additional section information */
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swabls(&h-> sh_addralign); /* Section alignment */
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swabls(&h-> sh_entsize); /* Entry size if section holds table */
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} |
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void elf_swap_phdr(struct elf_phdr *h) |
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{
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swab32s(&h->p_type); /* Segment type */
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swabls(&h->p_offset); /* Segment file offset */
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swabls(&h->p_vaddr); /* Segment virtual address */
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swabls(&h->p_paddr); /* Segment physical address */
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swabls(&h->p_filesz); /* Segment size in file */
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swabls(&h->p_memsz); /* Segment size in memory */
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swab32s(&h->p_flags); /* Segment flags */
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swabls(&h->p_align); /* Segment alignment */
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} |
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int do_swap;
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uint16_t get16(uint16_t *p) |
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{
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uint16_t val; |
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val = *p; |
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if (do_swap)
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val = bswap16(val); |
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return val;
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} |
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uint32_t get32(uint32_t *p) |
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{
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uint32_t val; |
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val = *p; |
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if (do_swap)
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val = bswap32(val); |
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return val;
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} |
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void put16(uint16_t *p, uint16_t val)
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{
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if (do_swap)
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val = bswap16(val); |
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*p = val; |
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} |
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void put32(uint32_t *p, uint32_t val)
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{
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if (do_swap)
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val = bswap32(val); |
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*p = val; |
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} |
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void __attribute__((noreturn)) error(const char *fmt, ...) |
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{
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va_list ap; |
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va_start(ap, fmt); |
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fprintf(stderr, "dyngen: ");
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vfprintf(stderr, fmt, ap); |
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fprintf(stderr, "\n");
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va_end(ap); |
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exit(1);
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} |
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struct elf_shdr *find_elf_section(struct elf_shdr *shdr, int shnum, const char *shstr, |
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const char *name) |
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{
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int i;
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const char *shname; |
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struct elf_shdr *sec;
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for(i = 0; i < shnum; i++) { |
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sec = &shdr[i]; |
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if (!sec->sh_name)
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continue;
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shname = shstr + sec->sh_name; |
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if (!strcmp(shname, name))
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return sec;
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} |
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return NULL; |
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} |
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void *load_data(int fd, long offset, unsigned int size) |
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{
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char *data;
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data = malloc(size); |
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if (!data)
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return NULL; |
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lseek(fd, offset, SEEK_SET); |
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if (read(fd, data, size) != size) {
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free(data); |
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return NULL; |
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} |
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return data;
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} |
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int strstart(const char *str, const char *val, const char **ptr) |
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{
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const char *p, *q; |
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p = str; |
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q = val; |
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while (*q != '\0') { |
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if (*p != *q)
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return 0; |
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p++; |
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q++; |
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} |
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if (ptr)
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*ptr = p; |
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return 1; |
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} |
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#define MAX_ARGS 3 |
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/* generate op code */
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void gen_code(const char *name, host_ulong offset, host_ulong size, |
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FILE *outfile, uint8_t *text, ELF_RELOC *relocs, int nb_relocs, int reloc_sh_type, |
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ElfW(Sym) *symtab, char *strtab, int gen_switch) |
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{
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int copy_size = 0; |
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uint8_t *p_start, *p_end; |
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int nb_args, i, n;
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uint8_t args_present[MAX_ARGS]; |
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const char *sym_name, *p; |
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ELF_RELOC *rel; |
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/* compute exact size excluding return instruction */
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p_start = text + offset; |
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p_end = p_start + size; |
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switch(ELF_ARCH) {
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case EM_386:
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{
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uint8_t *p; |
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p = p_end - 1;
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if (p == p_start)
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error("empty code for %s", name);
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if (p[0] != 0xc3) |
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error("ret expected at the end of %s", name);
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copy_size = p - p_start; |
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} |
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break;
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case EM_PPC:
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{
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uint8_t *p; |
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p = (void *)(p_end - 4); |
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if (p == p_start)
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error("empty code for %s", name);
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if (get32((uint32_t *)p) != 0x4e800020) |
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error("blr expected at the end of %s", name);
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copy_size = p - p_start; |
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} |
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break;
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case EM_S390:
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{
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uint8_t *p; |
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p = (void *)(p_end - 2); |
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if (p == p_start)
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error("empty code for %s", name);
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if (get16((uint16_t *)p) != 0x07fe && get16((uint16_t *)p) != 0x07f4) |
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error("br %r14 expected at the end of %s", name);
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copy_size = p - p_start; |
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} |
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break;
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} |
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/* compute the number of arguments by looking at the relocations */
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for(i = 0;i < MAX_ARGS; i++) |
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args_present[i] = 0;
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for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
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if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
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sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
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if (strstart(sym_name, "__op_param", &p)) { |
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n = strtoul(p, NULL, 10); |
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if (n >= MAX_ARGS)
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error("too many arguments in %s", name);
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args_present[n - 1] = 1; |
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} |
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} |
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} |
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nb_args = 0;
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while (nb_args < MAX_ARGS && args_present[nb_args])
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nb_args++; |
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for(i = nb_args; i < MAX_ARGS; i++) {
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if (args_present[i])
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error("inconsistent argument numbering in %s", name);
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} |
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|
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if (gen_switch == 2) { |
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fprintf(outfile, "DEF(%s, %d)\n", name + 3, nb_args); |
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} else if (gen_switch == 1) { |
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|
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/* output C code */
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fprintf(outfile, "case INDEX_%s: {\n", name);
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if (nb_args > 0) { |
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fprintf(outfile, " long ");
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for(i = 0; i < nb_args; i++) { |
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if (i != 0) |
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fprintf(outfile, ", ");
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fprintf(outfile, "param%d", i + 1); |
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} |
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fprintf(outfile, ";\n");
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} |
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fprintf(outfile, " extern void %s();\n", name);
|
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|
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for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
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if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
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sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name; |
| 348 |
if (!strstart(sym_name, "__op_param", &p)) { |
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fprintf(outfile, "extern char %s;\n", sym_name);
|
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} |
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} |
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} |
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|
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fprintf(outfile, " memcpy(gen_code_ptr, &%s, %d);\n", name, copy_size);
|
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for(i = 0; i < nb_args; i++) { |
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fprintf(outfile, " param%d = *opparam_ptr++;\n", i + 1); |
| 357 |
} |
| 358 |
|
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/* patch relocations */
|
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#if defined(HOST_I386)
|
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{
|
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char name[256]; |
| 363 |
int type;
|
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int addend;
|
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for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
| 366 |
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
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sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name; |
| 368 |
if (strstart(sym_name, "__op_param", &p)) { |
| 369 |
snprintf(name, sizeof(name), "param%s", p); |
| 370 |
} else {
|
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snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
| 372 |
} |
| 373 |
type = ELF32_R_TYPE(rel->r_info); |
| 374 |
addend = get32((uint32_t *)(text + rel->r_offset)); |
| 375 |
switch(type) {
|
| 376 |
case R_386_32:
|
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fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
| 378 |
rel->r_offset - offset, name, addend); |
| 379 |
break;
|
| 380 |
case R_386_PC32:
|
| 381 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
|
| 382 |
rel->r_offset - offset, name, rel->r_offset - offset, addend); |
| 383 |
break;
|
| 384 |
default:
|
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error("unsupported i386 relocation (%d)", type);
|
| 386 |
} |
| 387 |
} |
| 388 |
} |
| 389 |
} |
| 390 |
#elif defined(HOST_PPC)
|
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{
|
| 392 |
char name[256]; |
| 393 |
int type;
|
| 394 |
int addend;
|
| 395 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
| 396 |
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
|
| 397 |
sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name; |
| 398 |
if (strstart(sym_name, "__op_param", &p)) { |
| 399 |
snprintf(name, sizeof(name), "param%s", p); |
| 400 |
} else {
|
| 401 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
| 402 |
} |
| 403 |
type = ELF32_R_TYPE(rel->r_info); |
| 404 |
addend = rel->r_addend; |
| 405 |
switch(type) {
|
| 406 |
case R_PPC_ADDR32:
|
| 407 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
| 408 |
rel->r_offset - offset, name, addend); |
| 409 |
break;
|
| 410 |
case R_PPC_ADDR16_LO:
|
| 411 |
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
|
| 412 |
rel->r_offset - offset, name, addend); |
| 413 |
break;
|
| 414 |
case R_PPC_ADDR16_HI:
|
| 415 |
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
|
| 416 |
rel->r_offset - offset, name, addend); |
| 417 |
break;
|
| 418 |
case R_PPC_ADDR16_HA:
|
| 419 |
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
|
| 420 |
rel->r_offset - offset, name, addend); |
| 421 |
break;
|
| 422 |
case R_PPC_REL24:
|
| 423 |
/* warning: must be at 32 MB distancy */
|
| 424 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
|
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rel->r_offset - offset, rel->r_offset - offset, name, rel->r_offset - offset, addend); |
| 426 |
break;
|
| 427 |
default:
|
| 428 |
error("unsupported powerpc relocation (%d)", type);
|
| 429 |
} |
| 430 |
} |
| 431 |
} |
| 432 |
} |
| 433 |
#elif defined(HOST_S390)
|
| 434 |
{
|
| 435 |
char name[256]; |
| 436 |
int type;
|
| 437 |
int addend;
|
| 438 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
| 439 |
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
|
| 440 |
sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name; |
| 441 |
if (strstart(sym_name, "__op_param", &p)) { |
| 442 |
snprintf(name, sizeof(name), "param%s", p); |
| 443 |
} else {
|
| 444 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
| 445 |
} |
| 446 |
type = ELF32_R_TYPE(rel->r_info); |
| 447 |
addend = rel->r_addend; |
| 448 |
switch(type) {
|
| 449 |
case R_390_32:
|
| 450 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
| 451 |
rel->r_offset - offset, name, addend); |
| 452 |
break;
|
| 453 |
case R_390_16:
|
| 454 |
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
| 455 |
rel->r_offset - offset, name, addend); |
| 456 |
break;
|
| 457 |
case R_390_8:
|
| 458 |
fprintf(outfile, " *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
| 459 |
rel->r_offset - offset, name, addend); |
| 460 |
break;
|
| 461 |
default:
|
| 462 |
error("unsupported s390 relocation (%d)", type);
|
| 463 |
} |
| 464 |
} |
| 465 |
} |
| 466 |
} |
| 467 |
#else
|
| 468 |
#error unsupported CPU
|
| 469 |
#endif
|
| 470 |
fprintf(outfile, " gen_code_ptr += %d;\n", copy_size);
|
| 471 |
fprintf(outfile, "}\n");
|
| 472 |
fprintf(outfile, "break;\n\n");
|
| 473 |
} else {
|
| 474 |
fprintf(outfile, "static inline void gen_%s(", name);
|
| 475 |
if (nb_args == 0) { |
| 476 |
fprintf(outfile, "void");
|
| 477 |
} else {
|
| 478 |
for(i = 0; i < nb_args; i++) { |
| 479 |
if (i != 0) |
| 480 |
fprintf(outfile, ", ");
|
| 481 |
fprintf(outfile, "long param%d", i + 1); |
| 482 |
} |
| 483 |
} |
| 484 |
fprintf(outfile, ")\n");
|
| 485 |
fprintf(outfile, "{\n");
|
| 486 |
for(i = 0; i < nb_args; i++) { |
| 487 |
fprintf(outfile, " *gen_opparam_ptr++ = param%d;\n", i + 1); |
| 488 |
} |
| 489 |
fprintf(outfile, " *gen_opc_ptr++ = INDEX_%s;\n", name);
|
| 490 |
fprintf(outfile, "}\n\n");
|
| 491 |
} |
| 492 |
} |
| 493 |
|
| 494 |
/* load an elf object file */
|
| 495 |
int load_elf(const char *filename, FILE *outfile, int do_print_enum) |
| 496 |
{
|
| 497 |
int fd;
|
| 498 |
struct elfhdr ehdr;
|
| 499 |
struct elf_shdr *sec, *shdr, *symtab_sec, *strtab_sec, *text_sec;
|
| 500 |
int i, j, nb_syms;
|
| 501 |
ElfW(Sym) *symtab, *sym; |
| 502 |
char *shstr, *strtab;
|
| 503 |
uint8_t *text; |
| 504 |
void *relocs;
|
| 505 |
int nb_relocs, reloc_sh_type;
|
| 506 |
|
| 507 |
fd = open(filename, O_RDONLY); |
| 508 |
if (fd < 0) |
| 509 |
error("can't open file '%s'", filename);
|
| 510 |
|
| 511 |
/* Read ELF header. */
|
| 512 |
if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr)) |
| 513 |
error("unable to read file header");
|
| 514 |
|
| 515 |
/* Check ELF identification. */
|
| 516 |
if (ehdr.e_ident[EI_MAG0] != ELFMAG0
|
| 517 |
|| ehdr.e_ident[EI_MAG1] != ELFMAG1 |
| 518 |
|| ehdr.e_ident[EI_MAG2] != ELFMAG2 |
| 519 |
|| ehdr.e_ident[EI_MAG3] != ELFMAG3 |
| 520 |
|| ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
|
| 521 |
error("bad ELF header");
|
| 522 |
} |
| 523 |
|
| 524 |
do_swap = elf_must_swap(&ehdr); |
| 525 |
if (do_swap)
|
| 526 |
elf_swap_ehdr(&ehdr); |
| 527 |
if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
|
| 528 |
error("Unsupported ELF class");
|
| 529 |
if (ehdr.e_type != ET_REL)
|
| 530 |
error("ELF object file expected");
|
| 531 |
if (ehdr.e_version != EV_CURRENT)
|
| 532 |
error("Invalid ELF version");
|
| 533 |
if (!elf_check_arch(ehdr.e_machine))
|
| 534 |
error("Unsupported CPU (e_machine=%d)", ehdr.e_machine);
|
| 535 |
|
| 536 |
/* read section headers */
|
| 537 |
shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr)); |
| 538 |
if (do_swap) {
|
| 539 |
for(i = 0; i < ehdr.e_shnum; i++) { |
| 540 |
elf_swap_shdr(&shdr[i]); |
| 541 |
} |
| 542 |
} |
| 543 |
|
| 544 |
sec = &shdr[ehdr.e_shstrndx]; |
| 545 |
shstr = load_data(fd, sec->sh_offset, sec->sh_size); |
| 546 |
|
| 547 |
/* text section */
|
| 548 |
|
| 549 |
text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
|
| 550 |
if (!text_sec)
|
| 551 |
error("could not find .text section");
|
| 552 |
text = load_data(fd, text_sec->sh_offset, text_sec->sh_size); |
| 553 |
|
| 554 |
/* find text relocations, if any */
|
| 555 |
nb_relocs = 0;
|
| 556 |
relocs = NULL;
|
| 557 |
reloc_sh_type = 0;
|
| 558 |
for(i = 0; i < ehdr.e_shnum; i++) { |
| 559 |
sec = &shdr[i]; |
| 560 |
if ((sec->sh_type == SHT_REL || sec->sh_type == SHT_RELA) &&
|
| 561 |
sec->sh_info == (text_sec - shdr)) {
|
| 562 |
reloc_sh_type = sec->sh_type; |
| 563 |
relocs = load_data(fd, sec->sh_offset, sec->sh_size); |
| 564 |
nb_relocs = sec->sh_size / sec->sh_entsize; |
| 565 |
if (do_swap) {
|
| 566 |
if (sec->sh_type == SHT_REL) {
|
| 567 |
Elf32_Rel *rel = relocs; |
| 568 |
for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) { |
| 569 |
swab32s(&rel->r_offset); |
| 570 |
swab32s(&rel->r_info); |
| 571 |
} |
| 572 |
} else {
|
| 573 |
Elf32_Rela *rel = relocs; |
| 574 |
for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) { |
| 575 |
swab32s(&rel->r_offset); |
| 576 |
swab32s(&rel->r_info); |
| 577 |
swab32s(&rel->r_addend); |
| 578 |
} |
| 579 |
} |
| 580 |
} |
| 581 |
break;
|
| 582 |
} |
| 583 |
} |
| 584 |
|
| 585 |
symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
|
| 586 |
if (!symtab_sec)
|
| 587 |
error("could not find .symtab section");
|
| 588 |
strtab_sec = &shdr[symtab_sec->sh_link]; |
| 589 |
|
| 590 |
symtab = load_data(fd, symtab_sec->sh_offset, symtab_sec->sh_size); |
| 591 |
strtab = load_data(fd, strtab_sec->sh_offset, strtab_sec->sh_size); |
| 592 |
|
| 593 |
nb_syms = symtab_sec->sh_size / sizeof(Elf32_Sym);
|
| 594 |
if (do_swap) {
|
| 595 |
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
| 596 |
swab32s(&sym->st_name); |
| 597 |
swabls(&sym->st_value); |
| 598 |
swabls(&sym->st_size); |
| 599 |
swab16s(&sym->st_shndx); |
| 600 |
} |
| 601 |
} |
| 602 |
|
| 603 |
if (do_print_enum) {
|
| 604 |
fprintf(outfile, "DEF(end, 0)\n");
|
| 605 |
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
| 606 |
const char *name, *p; |
| 607 |
name = strtab + sym->st_name; |
| 608 |
if (strstart(name, OP_PREFIX, &p)) {
|
| 609 |
gen_code(name, sym->st_value, sym->st_size, outfile, |
| 610 |
text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 2);
|
| 611 |
} |
| 612 |
} |
| 613 |
} else {
|
| 614 |
/* generate big code generation switch */
|
| 615 |
fprintf(outfile, |
| 616 |
"int dyngen_code(uint8_t *gen_code_buf,\n"
|
| 617 |
" const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
|
| 618 |
"{\n"
|
| 619 |
" uint8_t *gen_code_ptr;\n"
|
| 620 |
" const uint16_t *opc_ptr;\n"
|
| 621 |
" const uint32_t *opparam_ptr;\n"
|
| 622 |
" gen_code_ptr = gen_code_buf;\n"
|
| 623 |
" opc_ptr = opc_buf;\n"
|
| 624 |
" opparam_ptr = opparam_buf;\n"
|
| 625 |
" for(;;) {\n"
|
| 626 |
" switch(*opc_ptr++) {\n"
|
| 627 |
); |
| 628 |
|
| 629 |
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
| 630 |
const char *name; |
| 631 |
name = strtab + sym->st_name; |
| 632 |
if (strstart(name, OP_PREFIX, NULL)) { |
| 633 |
#if 0
|
| 634 |
printf("%4d: %s pos=0x%08x len=%d\n",
|
| 635 |
i, name, sym->st_value, sym->st_size);
|
| 636 |
#endif
|
| 637 |
if (sym->st_shndx != (text_sec - shdr))
|
| 638 |
error("invalid section for opcode (0x%x)", sym->st_shndx);
|
| 639 |
gen_code(name, sym->st_value, sym->st_size, outfile, |
| 640 |
text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 1);
|
| 641 |
} |
| 642 |
} |
| 643 |
|
| 644 |
fprintf(outfile, |
| 645 |
" default:\n"
|
| 646 |
" goto the_end;\n"
|
| 647 |
" }\n"
|
| 648 |
" }\n"
|
| 649 |
" the_end:\n"
|
| 650 |
); |
| 651 |
|
| 652 |
/* generate a return */
|
| 653 |
switch(ELF_ARCH) {
|
| 654 |
case EM_386:
|
| 655 |
fprintf(outfile, "*gen_code_ptr++ = 0xc3; /* ret */\n");
|
| 656 |
break;
|
| 657 |
case EM_PPC:
|
| 658 |
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
|
| 659 |
break;
|
| 660 |
case EM_S390:
|
| 661 |
fprintf(outfile, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n");
|
| 662 |
break;
|
| 663 |
} |
| 664 |
|
| 665 |
fprintf(outfile, "return gen_code_ptr - gen_code_buf;\n");
|
| 666 |
fprintf(outfile, "}\n\n");
|
| 667 |
|
| 668 |
/* generate gen_xxx functions */
|
| 669 |
/* XXX: suppress the use of these functions to simplify code */
|
| 670 |
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
| 671 |
const char *name; |
| 672 |
name = strtab + sym->st_name; |
| 673 |
if (strstart(name, OP_PREFIX, NULL)) { |
| 674 |
if (sym->st_shndx != (text_sec - shdr))
|
| 675 |
error("invalid section for opcode (0x%x)", sym->st_shndx);
|
| 676 |
gen_code(name, sym->st_value, sym->st_size, outfile, |
| 677 |
text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 0);
|
| 678 |
} |
| 679 |
} |
| 680 |
} |
| 681 |
|
| 682 |
close(fd); |
| 683 |
return 0; |
| 684 |
} |
| 685 |
|
| 686 |
void usage(void) |
| 687 |
{
|
| 688 |
printf("dyngen (c) 2003 Fabrice Bellard\n"
|
| 689 |
"usage: dyngen [-o outfile] [-c] objfile\n"
|
| 690 |
"Generate a dynamic code generator from an object file\n"
|
| 691 |
"-c output enum of operations\n"
|
| 692 |
); |
| 693 |
exit(1);
|
| 694 |
} |
| 695 |
|
| 696 |
int main(int argc, char **argv) |
| 697 |
{
|
| 698 |
int c, do_print_enum;
|
| 699 |
const char *filename, *outfilename; |
| 700 |
FILE *outfile; |
| 701 |
|
| 702 |
outfilename = "out.c";
|
| 703 |
do_print_enum = 0;
|
| 704 |
for(;;) {
|
| 705 |
c = getopt(argc, argv, "ho:c");
|
| 706 |
if (c == -1) |
| 707 |
break;
|
| 708 |
switch(c) {
|
| 709 |
case 'h': |
| 710 |
usage(); |
| 711 |
break;
|
| 712 |
case 'o': |
| 713 |
outfilename = optarg; |
| 714 |
break;
|
| 715 |
case 'c': |
| 716 |
do_print_enum = 1;
|
| 717 |
break;
|
| 718 |
} |
| 719 |
} |
| 720 |
if (optind >= argc)
|
| 721 |
usage(); |
| 722 |
filename = argv[optind]; |
| 723 |
outfile = fopen(outfilename, "w");
|
| 724 |
if (!outfile)
|
| 725 |
error("could not open '%s'", outfilename);
|
| 726 |
load_elf(filename, outfile, do_print_enum); |
| 727 |
fclose(outfile); |
| 728 |
return 0; |
| 729 |
} |