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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-host.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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#elif defined(HOST_IA64)
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#define ELF_CLASS ELFCLASS64
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#define ELF_ARCH EM_IA_64
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#define elf_check_arch(x) ((x) == EM_IA_64)
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#define ELF_USES_RELOCA
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#elif defined(HOST_SPARC)
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#define ELF_CLASS ELFCLASS32
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#define ELF_ARCH EM_SPARC
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#define elf_check_arch(x) ((x) == EM_SPARC || (x) == EM_SPARC32PLUS)
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#define ELF_USES_RELOCA
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#elif defined(HOST_SPARC64)
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#define ELF_CLASS ELFCLASS64
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#define ELF_ARCH EM_SPARCV9
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#define elf_check_arch(x) ((x) == EM_SPARCV9)
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#define ELF_USES_RELOCA
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#elif defined(HOST_ARM)
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#define ELF_CLASS ELFCLASS32
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#define ELF_ARCH EM_ARM
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#define elf_check_arch(x) ((x) == EM_ARM)
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#define ELF_USES_RELOC
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#elif defined(HOST_M68K)
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#define ELF_CLASS ELFCLASS32
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#define ELF_ARCH EM_68K
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#define elf_check_arch(x) ((x) == EM_68K)
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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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#include "elf.h" |
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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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#define swabls(x) swab32s(x)
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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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#define swabls(x) swab64s(x)
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#endif
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#ifdef ELF_USES_RELOCA
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#define SHT_RELOC SHT_RELA
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#else
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#define SHT_RELOC SHT_REL
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#endif
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#include "bswap.h" |
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enum {
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OUT_GEN_OP, |
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OUT_CODE, |
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OUT_INDEX_OP, |
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}; |
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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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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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void elf_swap_rel(ELF_RELOC *rel)
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{ |
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swabls(&rel->r_offset); |
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swabls(&rel->r_info); |
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#ifdef ELF_USES_RELOCA
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swabls(&rel->r_addend); |
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#endif
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} |
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/* ELF file info */
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int do_swap;
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struct elf_shdr *shdr;
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uint8_t **sdata; |
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struct elfhdr ehdr;
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ElfW(Sym) *symtab; |
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int nb_syms;
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char *strtab;
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int text_shndx;
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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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} |
242 |
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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)) __attribute__((format (printf, 1, 2))) 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); |
256 |
fprintf(stderr, "\n");
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va_end(ap); |
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exit(1);
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} |
260 |
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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]; |
271 |
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; |
278 |
} |
279 |
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int find_reloc(int sh_index) |
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{ |
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struct elf_shdr *sec;
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int i;
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for(i = 0; i < ehdr.e_shnum; i++) { |
286 |
sec = &shdr[i]; |
287 |
if (sec->sh_type == SHT_RELOC && sec->sh_info == sh_index)
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return i;
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} |
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return 0; |
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} |
292 |
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void *load_data(int fd, long offset, unsigned int size) |
294 |
{ |
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char *data;
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data = malloc(size); |
298 |
if (!data)
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return NULL; |
300 |
lseek(fd, offset, SEEK_SET); |
301 |
if (read(fd, data, size) != size) {
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free(data); |
303 |
return NULL; |
304 |
} |
305 |
return data;
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} |
307 |
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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; |
313 |
while (*q != '\0') { |
314 |
if (*p != *q)
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return 0; |
316 |
p++; |
317 |
q++; |
318 |
} |
319 |
if (ptr)
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*ptr = p; |
321 |
return 1; |
322 |
} |
323 |
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#ifdef HOST_ARM
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326 |
int arm_emit_ldr_info(const char *name, unsigned long start_offset, |
327 |
FILE *outfile, uint8_t *p_start, uint8_t *p_end, |
328 |
ELF_RELOC *relocs, int nb_relocs)
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{ |
330 |
uint8_t *p; |
331 |
uint32_t insn; |
332 |
int offset, min_offset, pc_offset, data_size;
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uint8_t data_allocated[1024];
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unsigned int data_index; |
335 |
|
336 |
memset(data_allocated, 0, sizeof(data_allocated)); |
337 |
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338 |
p = p_start; |
339 |
min_offset = p_end - p_start; |
340 |
while (p < p_start + min_offset) {
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341 |
insn = get32((uint32_t *)p); |
342 |
if ((insn & 0x0d5f0000) == 0x051f0000) { |
343 |
/* ldr reg, [pc, #im] */
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344 |
offset = insn & 0xfff;
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345 |
if (!(insn & 0x00800000)) |
346 |
offset = -offset; |
347 |
if ((offset & 3) !=0) |
348 |
error("%s:%04x: ldr pc offset must be 32 bit aligned",
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349 |
name, start_offset + p - p_start); |
350 |
pc_offset = p - p_start + offset + 8;
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351 |
if (pc_offset <= (p - p_start) ||
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352 |
pc_offset >= (p_end - p_start)) |
353 |
error("%s:%04x: ldr pc offset must point inside the function code",
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354 |
name, start_offset + p - p_start); |
355 |
if (pc_offset < min_offset)
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356 |
min_offset = pc_offset; |
357 |
if (outfile) {
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358 |
/* ldr position */
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359 |
fprintf(outfile, " arm_ldr_ptr->ptr = gen_code_ptr + %d;\n",
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360 |
p - p_start); |
361 |
/* ldr data index */
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362 |
data_index = ((p_end - p_start) - pc_offset - 4) >> 2; |
363 |
fprintf(outfile, " arm_ldr_ptr->data_ptr = arm_data_ptr + %d;\n",
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364 |
data_index); |
365 |
fprintf(outfile, " arm_ldr_ptr++;\n");
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366 |
if (data_index >= sizeof(data_allocated)) |
367 |
error("%s: too many data", name);
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368 |
if (!data_allocated[data_index]) {
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369 |
ELF_RELOC *rel; |
370 |
int i, addend, type;
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371 |
const char *sym_name, *p; |
372 |
char relname[1024]; |
373 |
|
374 |
data_allocated[data_index] = 1;
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375 |
|
376 |
/* data value */
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377 |
addend = get32((uint32_t *)(p_start + pc_offset)); |
378 |
relname[0] = '\0'; |
379 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
380 |
if (rel->r_offset == (pc_offset + start_offset)) {
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381 |
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
382 |
/* the compiler leave some unnecessary references to the code */
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383 |
if (strstart(sym_name, "__op_param", &p)) { |
384 |
snprintf(relname, sizeof(relname), "param%s", p); |
385 |
} else {
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386 |
snprintf(relname, sizeof(relname), "(long)(&%s)", sym_name); |
387 |
} |
388 |
type = ELF32_R_TYPE(rel->r_info); |
389 |
if (type != R_ARM_ABS32)
|
390 |
error("%s: unsupported data relocation", name);
|
391 |
break;
|
392 |
} |
393 |
} |
394 |
fprintf(outfile, " arm_data_ptr[%d] = 0x%x",
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395 |
data_index, addend); |
396 |
if (relname[0] != '\0') |
397 |
fprintf(outfile, " + %s", relname);
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398 |
fprintf(outfile, ";\n");
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399 |
} |
400 |
} |
401 |
} |
402 |
p += 4;
|
403 |
} |
404 |
data_size = (p_end - p_start) - min_offset; |
405 |
if (data_size > 0 && outfile) { |
406 |
fprintf(outfile, " arm_data_ptr += %d;\n", data_size >> 2); |
407 |
} |
408 |
|
409 |
/* the last instruction must be a mov pc, lr */
|
410 |
if (p == p_start)
|
411 |
goto arm_ret_error;
|
412 |
p -= 4;
|
413 |
insn = get32((uint32_t *)p); |
414 |
if ((insn & 0xffff0000) != 0xe91b0000) { |
415 |
arm_ret_error:
|
416 |
if (!outfile)
|
417 |
printf("%s: invalid epilog\n", name);
|
418 |
} |
419 |
return p - p_start;
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420 |
} |
421 |
#endif
|
422 |
|
423 |
|
424 |
#define MAX_ARGS 3 |
425 |
|
426 |
/* generate op code */
|
427 |
void gen_code(const char *name, host_ulong offset, host_ulong size, |
428 |
FILE *outfile, uint8_t *text, ELF_RELOC *relocs, int nb_relocs,
|
429 |
int gen_switch)
|
430 |
{ |
431 |
int copy_size = 0; |
432 |
uint8_t *p_start, *p_end; |
433 |
host_ulong start_offset; |
434 |
int nb_args, i, n;
|
435 |
uint8_t args_present[MAX_ARGS]; |
436 |
const char *sym_name, *p; |
437 |
ELF_RELOC *rel; |
438 |
|
439 |
/* Compute exact size excluding prologue and epilogue instructions.
|
440 |
* Increment start_offset to skip epilogue instructions, then compute
|
441 |
* copy_size the indicate the size of the remaining instructions (in
|
442 |
* bytes).
|
443 |
*/
|
444 |
p_start = text + offset; |
445 |
p_end = p_start + size; |
446 |
start_offset = offset; |
447 |
switch(ELF_ARCH) {
|
448 |
case EM_386:
|
449 |
{ |
450 |
int len;
|
451 |
len = p_end - p_start; |
452 |
if (len == 0) |
453 |
error("empty code for %s", name);
|
454 |
if (p_end[-1] == 0xc3) { |
455 |
len--; |
456 |
} else {
|
457 |
error("ret or jmp expected at the end of %s", name);
|
458 |
} |
459 |
copy_size = len; |
460 |
} |
461 |
break;
|
462 |
case EM_PPC:
|
463 |
{ |
464 |
uint8_t *p; |
465 |
p = (void *)(p_end - 4); |
466 |
if (p == p_start)
|
467 |
error("empty code for %s", name);
|
468 |
if (get32((uint32_t *)p) != 0x4e800020) |
469 |
error("blr expected at the end of %s", name);
|
470 |
copy_size = p - p_start; |
471 |
} |
472 |
break;
|
473 |
case EM_S390:
|
474 |
{ |
475 |
uint8_t *p; |
476 |
p = (void *)(p_end - 2); |
477 |
if (p == p_start)
|
478 |
error("empty code for %s", name);
|
479 |
if (get16((uint16_t *)p) != 0x07fe && get16((uint16_t *)p) != 0x07f4) |
480 |
error("br %%r14 expected at the end of %s", name);
|
481 |
copy_size = p - p_start; |
482 |
} |
483 |
break;
|
484 |
case EM_ALPHA:
|
485 |
{ |
486 |
uint8_t *p; |
487 |
p = p_end - 4;
|
488 |
if (p == p_start)
|
489 |
error("empty code for %s", name);
|
490 |
if (get32((uint32_t *)p) != 0x6bfa8001) |
491 |
error("ret expected at the end of %s", name);
|
492 |
copy_size = p - p_start; |
493 |
} |
494 |
break;
|
495 |
case EM_IA_64:
|
496 |
{ |
497 |
uint8_t *p; |
498 |
p = (void *)(p_end - 4); |
499 |
if (p == p_start)
|
500 |
error("empty code for %s", name);
|
501 |
/* br.ret.sptk.many b0;; */
|
502 |
/* 08 00 84 00 */
|
503 |
if (get32((uint32_t *)p) != 0x00840008) |
504 |
error("br.ret.sptk.many b0;; expected at the end of %s", name);
|
505 |
copy_size = p - p_start; |
506 |
} |
507 |
break;
|
508 |
case EM_SPARC:
|
509 |
case EM_SPARC32PLUS:
|
510 |
{ |
511 |
uint32_t start_insn, end_insn1, end_insn2; |
512 |
uint8_t *p; |
513 |
p = (void *)(p_end - 8); |
514 |
if (p <= p_start)
|
515 |
error("empty code for %s", name);
|
516 |
start_insn = get32((uint32_t *)(p_start + 0x0));
|
517 |
end_insn1 = get32((uint32_t *)(p + 0x0));
|
518 |
end_insn2 = get32((uint32_t *)(p + 0x4));
|
519 |
if ((start_insn & ~0x1fff) == 0x9de3a000) { |
520 |
p_start += 0x4;
|
521 |
start_offset += 0x4;
|
522 |
if ((int)(start_insn | ~0x1fff) < -128) |
523 |
error("Found bogus save at the start of %s", name);
|
524 |
if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000) |
525 |
error("ret; restore; not found at end of %s", name);
|
526 |
} else {
|
527 |
error("No save at the beginning of %s", name);
|
528 |
} |
529 |
#if 0
|
530 |
/* Skip a preceeding nop, if present. */
|
531 |
if (p > p_start) {
|
532 |
skip_insn = get32((uint32_t *)(p - 0x4));
|
533 |
if (skip_insn == 0x01000000)
|
534 |
p -= 4;
|
535 |
}
|
536 |
#endif
|
537 |
copy_size = p - p_start; |
538 |
} |
539 |
break;
|
540 |
case EM_SPARCV9:
|
541 |
{ |
542 |
uint32_t start_insn, end_insn1, end_insn2, skip_insn; |
543 |
uint8_t *p; |
544 |
p = (void *)(p_end - 8); |
545 |
if (p <= p_start)
|
546 |
error("empty code for %s", name);
|
547 |
start_insn = get32((uint32_t *)(p_start + 0x0));
|
548 |
end_insn1 = get32((uint32_t *)(p + 0x0));
|
549 |
end_insn2 = get32((uint32_t *)(p + 0x4));
|
550 |
if ((start_insn & ~0x1fff) == 0x9de3a000) { |
551 |
p_start += 0x4;
|
552 |
start_offset += 0x4;
|
553 |
if ((int)(start_insn | ~0x1fff) < -256) |
554 |
error("Found bogus save at the start of %s", name);
|
555 |
if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000) |
556 |
error("ret; restore; not found at end of %s", name);
|
557 |
} else {
|
558 |
error("No save at the beginning of %s", name);
|
559 |
} |
560 |
|
561 |
/* Skip a preceeding nop, if present. */
|
562 |
if (p > p_start) {
|
563 |
skip_insn = get32((uint32_t *)(p - 0x4));
|
564 |
if (skip_insn == 0x01000000) |
565 |
p -= 4;
|
566 |
} |
567 |
|
568 |
copy_size = p - p_start; |
569 |
} |
570 |
break;
|
571 |
#ifdef HOST_ARM
|
572 |
case EM_ARM:
|
573 |
if ((p_end - p_start) <= 16) |
574 |
error("%s: function too small", name);
|
575 |
if (get32((uint32_t *)p_start) != 0xe1a0c00d || |
576 |
(get32((uint32_t *)(p_start + 4)) & 0xffff0000) != 0xe92d0000 || |
577 |
get32((uint32_t *)(p_start + 8)) != 0xe24cb004) |
578 |
error("%s: invalid prolog", name);
|
579 |
p_start += 12;
|
580 |
start_offset += 12;
|
581 |
copy_size = arm_emit_ldr_info(name, start_offset, NULL, p_start, p_end,
|
582 |
relocs, nb_relocs); |
583 |
break;
|
584 |
#endif
|
585 |
case EM_68K:
|
586 |
{ |
587 |
uint8_t *p; |
588 |
p = (void *)(p_end - 2); |
589 |
if (p == p_start)
|
590 |
error("empty code for %s", name);
|
591 |
// remove NOP's, probably added for alignment
|
592 |
while ((get16((uint16_t *)p) == 0x4e71) && |
593 |
(p>p_start)) |
594 |
p -= 2;
|
595 |
if (get16((uint16_t *)p) != 0x4e75) |
596 |
error("rts expected at the end of %s", name);
|
597 |
copy_size = p - p_start; |
598 |
} |
599 |
break;
|
600 |
default:
|
601 |
error("unknown ELF architecture");
|
602 |
} |
603 |
|
604 |
/* compute the number of arguments by looking at the relocations */
|
605 |
for(i = 0;i < MAX_ARGS; i++) |
606 |
args_present[i] = 0;
|
607 |
|
608 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
609 |
if (rel->r_offset >= start_offset &&
|
610 |
rel->r_offset < start_offset + (p_end - p_start)) { |
611 |
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
612 |
if (strstart(sym_name, "__op_param", &p)) { |
613 |
n = strtoul(p, NULL, 10); |
614 |
if (n > MAX_ARGS)
|
615 |
error("too many arguments in %s", name);
|
616 |
args_present[n - 1] = 1; |
617 |
} |
618 |
} |
619 |
} |
620 |
|
621 |
nb_args = 0;
|
622 |
while (nb_args < MAX_ARGS && args_present[nb_args])
|
623 |
nb_args++; |
624 |
for(i = nb_args; i < MAX_ARGS; i++) {
|
625 |
if (args_present[i])
|
626 |
error("inconsistent argument numbering in %s", name);
|
627 |
} |
628 |
|
629 |
if (gen_switch == 2) { |
630 |
fprintf(outfile, "DEF(%s, %d, %d)\n", name + 3, nb_args, copy_size); |
631 |
} else if (gen_switch == 1) { |
632 |
|
633 |
/* output C code */
|
634 |
fprintf(outfile, "case INDEX_%s: {\n", name);
|
635 |
if (nb_args > 0) { |
636 |
fprintf(outfile, " long ");
|
637 |
for(i = 0; i < nb_args; i++) { |
638 |
if (i != 0) |
639 |
fprintf(outfile, ", ");
|
640 |
fprintf(outfile, "param%d", i + 1); |
641 |
} |
642 |
fprintf(outfile, ";\n");
|
643 |
} |
644 |
fprintf(outfile, " extern void %s();\n", name);
|
645 |
|
646 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
647 |
if (rel->r_offset >= start_offset &&
|
648 |
rel->r_offset < start_offset + (p_end - p_start)) { |
649 |
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
650 |
if (*sym_name &&
|
651 |
!strstart(sym_name, "__op_param", NULL) && |
652 |
!strstart(sym_name, "__op_jmp", NULL)) { |
653 |
#if defined(HOST_SPARC)
|
654 |
if (sym_name[0] == '.') { |
655 |
fprintf(outfile, |
656 |
"extern char __dot_%s __asm__(\"%s\");\n",
|
657 |
sym_name+1, sym_name);
|
658 |
continue;
|
659 |
} |
660 |
#endif
|
661 |
fprintf(outfile, "extern char %s;\n", sym_name);
|
662 |
} |
663 |
} |
664 |
} |
665 |
|
666 |
fprintf(outfile, " memcpy(gen_code_ptr, (void *)((char *)&%s+%d), %d);\n", name, start_offset - offset, copy_size);
|
667 |
|
668 |
/* emit code offset information */
|
669 |
{ |
670 |
ElfW(Sym) *sym; |
671 |
const char *sym_name, *p; |
672 |
unsigned long val; |
673 |
int n;
|
674 |
|
675 |
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
676 |
sym_name = strtab + sym->st_name; |
677 |
if (strstart(sym_name, "__op_label", &p)) { |
678 |
uint8_t *ptr; |
679 |
unsigned long offset; |
680 |
|
681 |
/* test if the variable refers to a label inside
|
682 |
the code we are generating */
|
683 |
ptr = sdata[sym->st_shndx]; |
684 |
if (!ptr)
|
685 |
error("__op_labelN in invalid section");
|
686 |
offset = sym->st_value; |
687 |
val = *(unsigned long *)(ptr + offset); |
688 |
#ifdef ELF_USES_RELOCA
|
689 |
{ |
690 |
int reloc_shndx, nb_relocs1, j;
|
691 |
|
692 |
/* try to find a matching relocation */
|
693 |
reloc_shndx = find_reloc(sym->st_shndx); |
694 |
if (reloc_shndx) {
|
695 |
nb_relocs1 = shdr[reloc_shndx].sh_size / |
696 |
shdr[reloc_shndx].sh_entsize; |
697 |
rel = (ELF_RELOC *)sdata[reloc_shndx]; |
698 |
for(j = 0; j < nb_relocs1; j++) { |
699 |
if (rel->r_offset == offset) {
|
700 |
val = rel->r_addend; |
701 |
break;
|
702 |
} |
703 |
rel++; |
704 |
} |
705 |
} |
706 |
} |
707 |
#endif
|
708 |
|
709 |
if (val >= start_offset && val < start_offset + copy_size) {
|
710 |
n = strtol(p, NULL, 10); |
711 |
fprintf(outfile, " label_offsets[%d] = %ld + (gen_code_ptr - gen_code_buf);\n", n, val - start_offset);
|
712 |
} |
713 |
} |
714 |
} |
715 |
} |
716 |
|
717 |
/* load parameres in variables */
|
718 |
for(i = 0; i < nb_args; i++) { |
719 |
fprintf(outfile, " param%d = *opparam_ptr++;\n", i + 1); |
720 |
} |
721 |
|
722 |
/* patch relocations */
|
723 |
#if defined(HOST_I386)
|
724 |
{ |
725 |
char name[256]; |
726 |
int type;
|
727 |
int addend;
|
728 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
729 |
if (rel->r_offset >= start_offset &&
|
730 |
rel->r_offset < start_offset + copy_size) { |
731 |
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
732 |
if (strstart(sym_name, "__op_param", &p)) { |
733 |
snprintf(name, sizeof(name), "param%s", p); |
734 |
} else {
|
735 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
736 |
} |
737 |
type = ELF32_R_TYPE(rel->r_info); |
738 |
addend = get32((uint32_t *)(text + rel->r_offset)); |
739 |
switch(type) {
|
740 |
case R_386_32:
|
741 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
742 |
rel->r_offset - start_offset, name, addend); |
743 |
break;
|
744 |
case R_386_PC32:
|
745 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
|
746 |
rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend); |
747 |
break;
|
748 |
default:
|
749 |
error("unsupported i386 relocation (%d)", type);
|
750 |
} |
751 |
} |
752 |
} |
753 |
} |
754 |
#elif defined(HOST_PPC)
|
755 |
{ |
756 |
char name[256]; |
757 |
int type;
|
758 |
int addend;
|
759 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
760 |
if (rel->r_offset >= start_offset &&
|
761 |
rel->r_offset < start_offset + copy_size) { |
762 |
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
763 |
if (strstart(sym_name, "__op_jmp", &p)) { |
764 |
int n;
|
765 |
n = strtol(p, NULL, 10); |
766 |
/* __op_jmp relocations are done at
|
767 |
runtime to do translated block
|
768 |
chaining: the offset of the instruction
|
769 |
needs to be stored */
|
770 |
fprintf(outfile, " jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
|
771 |
n, rel->r_offset - start_offset); |
772 |
continue;
|
773 |
} |
774 |
|
775 |
if (strstart(sym_name, "__op_param", &p)) { |
776 |
snprintf(name, sizeof(name), "param%s", p); |
777 |
} else {
|
778 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
779 |
} |
780 |
type = ELF32_R_TYPE(rel->r_info); |
781 |
addend = rel->r_addend; |
782 |
switch(type) {
|
783 |
case R_PPC_ADDR32:
|
784 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
785 |
rel->r_offset - start_offset, name, addend); |
786 |
break;
|
787 |
case R_PPC_ADDR16_LO:
|
788 |
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
|
789 |
rel->r_offset - start_offset, name, addend); |
790 |
break;
|
791 |
case R_PPC_ADDR16_HI:
|
792 |
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
|
793 |
rel->r_offset - start_offset, name, addend); |
794 |
break;
|
795 |
case R_PPC_ADDR16_HA:
|
796 |
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
|
797 |
rel->r_offset - start_offset, name, addend); |
798 |
break;
|
799 |
case R_PPC_REL24:
|
800 |
/* warning: must be at 32 MB distancy */
|
801 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
|
802 |
rel->r_offset - start_offset, rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend); |
803 |
break;
|
804 |
default:
|
805 |
error("unsupported powerpc relocation (%d)", type);
|
806 |
} |
807 |
} |
808 |
} |
809 |
} |
810 |
#elif defined(HOST_S390)
|
811 |
{ |
812 |
char name[256]; |
813 |
int type;
|
814 |
int addend;
|
815 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
816 |
if (rel->r_offset >= start_offset &&
|
817 |
rel->r_offset < start_offset + copy_size) { |
818 |
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
819 |
if (strstart(sym_name, "__op_param", &p)) { |
820 |
snprintf(name, sizeof(name), "param%s", p); |
821 |
} else {
|
822 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
823 |
} |
824 |
type = ELF32_R_TYPE(rel->r_info); |
825 |
addend = rel->r_addend; |
826 |
switch(type) {
|
827 |
case R_390_32:
|
828 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
829 |
rel->r_offset - start_offset, name, addend); |
830 |
break;
|
831 |
case R_390_16:
|
832 |
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
833 |
rel->r_offset - start_offset, name, addend); |
834 |
break;
|
835 |
case R_390_8:
|
836 |
fprintf(outfile, " *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
837 |
rel->r_offset - start_offset, name, addend); |
838 |
break;
|
839 |
default:
|
840 |
error("unsupported s390 relocation (%d)", type);
|
841 |
} |
842 |
} |
843 |
} |
844 |
} |
845 |
#elif defined(HOST_ALPHA)
|
846 |
{ |
847 |
for (i = 0, rel = relocs; i < nb_relocs; i++, rel++) { |
848 |
if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
|
849 |
int type;
|
850 |
|
851 |
type = ELF64_R_TYPE(rel->r_info); |
852 |
sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name; |
853 |
switch (type) {
|
854 |
case R_ALPHA_GPDISP:
|
855 |
/* The gp is just 32 bit, and never changes, so it's easiest to emit it
|
856 |
as an immediate instead of constructing it from the pv or ra. */
|
857 |
fprintf(outfile, " immediate_ldah(gen_code_ptr + %ld, gp);\n",
|
858 |
rel->r_offset - start_offset); |
859 |
fprintf(outfile, " immediate_lda(gen_code_ptr + %ld, gp);\n",
|
860 |
rel->r_offset - start_offset + rel->r_addend); |
861 |
break;
|
862 |
case R_ALPHA_LITUSE:
|
863 |
/* jsr to literal hint. Could be used to optimize to bsr. Ignore for
|
864 |
now, since some called functions (libc) need pv to be set up. */
|
865 |
break;
|
866 |
case R_ALPHA_HINT:
|
867 |
/* Branch target prediction hint. Ignore for now. Should be already
|
868 |
correct for in-function jumps. */
|
869 |
break;
|
870 |
case R_ALPHA_LITERAL:
|
871 |
/* Load a literal from the GOT relative to the gp. Since there's only a
|
872 |
single gp, nothing is to be done. */
|
873 |
break;
|
874 |
case R_ALPHA_GPRELHIGH:
|
875 |
/* Handle fake relocations against __op_param symbol. Need to emit the
|
876 |
high part of the immediate value instead. Other symbols need no
|
877 |
special treatment. */
|
878 |
if (strstart(sym_name, "__op_param", &p)) |
879 |
fprintf(outfile, " immediate_ldah(gen_code_ptr + %ld, param%s);\n",
|
880 |
rel->r_offset - start_offset, p); |
881 |
break;
|
882 |
case R_ALPHA_GPRELLOW:
|
883 |
if (strstart(sym_name, "__op_param", &p)) |
884 |
fprintf(outfile, " immediate_lda(gen_code_ptr + %ld, param%s);\n",
|
885 |
rel->r_offset - start_offset, p); |
886 |
break;
|
887 |
case R_ALPHA_BRSGP:
|
888 |
/* PC-relative jump. Tweak offset to skip the two instructions that try to
|
889 |
set up the gp from the pv. */
|
890 |
fprintf(outfile, " fix_bsr(gen_code_ptr + %ld, (uint8_t *) &%s - (gen_code_ptr + %ld + 4) + 8);\n",
|
891 |
rel->r_offset - start_offset, sym_name, rel->r_offset - start_offset); |
892 |
break;
|
893 |
default:
|
894 |
error("unsupported Alpha relocation (%d)", type);
|
895 |
} |
896 |
} |
897 |
} |
898 |
} |
899 |
#elif defined(HOST_IA64)
|
900 |
{ |
901 |
char name[256]; |
902 |
int type;
|
903 |
int addend;
|
904 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
905 |
if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
|
906 |
sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name; |
907 |
if (strstart(sym_name, "__op_param", &p)) { |
908 |
snprintf(name, sizeof(name), "param%s", p); |
909 |
} else {
|
910 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
911 |
} |
912 |
type = ELF64_R_TYPE(rel->r_info); |
913 |
addend = rel->r_addend; |
914 |
switch(type) {
|
915 |
case R_IA64_LTOFF22:
|
916 |
error("must implemnt R_IA64_LTOFF22 relocation");
|
917 |
case R_IA64_PCREL21B:
|
918 |
error("must implemnt R_IA64_PCREL21B relocation");
|
919 |
default:
|
920 |
error("unsupported ia64 relocation (%d)", type);
|
921 |
} |
922 |
} |
923 |
} |
924 |
} |
925 |
#elif defined(HOST_SPARC)
|
926 |
{ |
927 |
char name[256]; |
928 |
int type;
|
929 |
int addend;
|
930 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
931 |
if (rel->r_offset >= start_offset &&
|
932 |
rel->r_offset < start_offset + copy_size) { |
933 |
sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name; |
934 |
if (strstart(sym_name, "__op_param", &p)) { |
935 |
snprintf(name, sizeof(name), "param%s", p); |
936 |
} else {
|
937 |
if (sym_name[0] == '.') |
938 |
snprintf(name, sizeof(name),
|
939 |
"(long)(&__dot_%s)",
|
940 |
sym_name + 1);
|
941 |
else
|
942 |
snprintf(name, sizeof(name),
|
943 |
"(long)(&%s)", sym_name);
|
944 |
} |
945 |
type = ELF32_R_TYPE(rel->r_info); |
946 |
addend = rel->r_addend; |
947 |
switch(type) {
|
948 |
case R_SPARC_32:
|
949 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
950 |
rel->r_offset - start_offset, name, addend); |
951 |
break;
|
952 |
case R_SPARC_HI22:
|
953 |
fprintf(outfile, |
954 |
" *(uint32_t *)(gen_code_ptr + %d) = "
|
955 |
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
956 |
" & ~0x3fffff) "
|
957 |
" | (((%s + %d) >> 10) & 0x3fffff);\n",
|
958 |
rel->r_offset - start_offset, |
959 |
rel->r_offset - start_offset, |
960 |
name, addend); |
961 |
break;
|
962 |
case R_SPARC_LO10:
|
963 |
fprintf(outfile, |
964 |
" *(uint32_t *)(gen_code_ptr + %d) = "
|
965 |
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
966 |
" & ~0x3ff) "
|
967 |
" | ((%s + %d) & 0x3ff);\n",
|
968 |
rel->r_offset - start_offset, |
969 |
rel->r_offset - start_offset, |
970 |
name, addend); |
971 |
break;
|
972 |
case R_SPARC_WDISP30:
|
973 |
fprintf(outfile, |
974 |
" *(uint32_t *)(gen_code_ptr + %d) = "
|
975 |
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
976 |
" & ~0x3fffffff) "
|
977 |
" | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
|
978 |
" & 0x3fffffff);\n",
|
979 |
rel->r_offset - start_offset, |
980 |
rel->r_offset - start_offset, |
981 |
name, addend, |
982 |
rel->r_offset - start_offset); |
983 |
break;
|
984 |
default:
|
985 |
error("unsupported sparc relocation (%d)", type);
|
986 |
} |
987 |
} |
988 |
} |
989 |
} |
990 |
#elif defined(HOST_SPARC64)
|
991 |
{ |
992 |
char name[256]; |
993 |
int type;
|
994 |
int addend;
|
995 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
996 |
if (rel->r_offset >= start_offset &&
|
997 |
rel->r_offset < start_offset + copy_size) { |
998 |
sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name; |
999 |
if (strstart(sym_name, "__op_param", &p)) { |
1000 |
snprintf(name, sizeof(name), "param%s", p); |
1001 |
} else {
|
1002 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
1003 |
} |
1004 |
type = ELF64_R_TYPE(rel->r_info); |
1005 |
addend = rel->r_addend; |
1006 |
switch(type) {
|
1007 |
case R_SPARC_32:
|
1008 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
1009 |
rel->r_offset - start_offset, name, addend); |
1010 |
break;
|
1011 |
case R_SPARC_HI22:
|
1012 |
fprintf(outfile, |
1013 |
" *(uint32_t *)(gen_code_ptr + %d) = "
|
1014 |
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
1015 |
" & ~0x3fffff) "
|
1016 |
" | (((%s + %d) >> 10) & 0x3fffff);\n",
|
1017 |
rel->r_offset - start_offset, |
1018 |
rel->r_offset - start_offset, |
1019 |
name, addend); |
1020 |
break;
|
1021 |
case R_SPARC_LO10:
|
1022 |
fprintf(outfile, |
1023 |
" *(uint32_t *)(gen_code_ptr + %d) = "
|
1024 |
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
1025 |
" & ~0x3ff) "
|
1026 |
" | ((%s + %d) & 0x3ff);\n",
|
1027 |
rel->r_offset - start_offset, |
1028 |
rel->r_offset - start_offset, |
1029 |
name, addend); |
1030 |
break;
|
1031 |
case R_SPARC_WDISP30:
|
1032 |
fprintf(outfile, |
1033 |
" *(uint32_t *)(gen_code_ptr + %d) = "
|
1034 |
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
1035 |
" & ~0x3fffffff) "
|
1036 |
" | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
|
1037 |
" & 0x3fffffff);\n",
|
1038 |
rel->r_offset - start_offset, |
1039 |
rel->r_offset - start_offset, |
1040 |
name, addend, |
1041 |
rel->r_offset - start_offset); |
1042 |
break;
|
1043 |
default:
|
1044 |
error("unsupported sparc64 relocation (%d)", type);
|
1045 |
} |
1046 |
} |
1047 |
} |
1048 |
} |
1049 |
#elif defined(HOST_ARM)
|
1050 |
{ |
1051 |
char name[256]; |
1052 |
int type;
|
1053 |
int addend;
|
1054 |
|
1055 |
arm_emit_ldr_info(name, start_offset, outfile, p_start, p_end, |
1056 |
relocs, nb_relocs); |
1057 |
|
1058 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
1059 |
if (rel->r_offset >= start_offset &&
|
1060 |
rel->r_offset < start_offset + copy_size) { |
1061 |
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
1062 |
/* the compiler leave some unnecessary references to the code */
|
1063 |
if (sym_name[0] == '\0') |
1064 |
continue;
|
1065 |
if (strstart(sym_name, "__op_param", &p)) { |
1066 |
snprintf(name, sizeof(name), "param%s", p); |
1067 |
} else {
|
1068 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
1069 |
} |
1070 |
type = ELF32_R_TYPE(rel->r_info); |
1071 |
addend = get32((uint32_t *)(text + rel->r_offset)); |
1072 |
switch(type) {
|
1073 |
case R_ARM_ABS32:
|
1074 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
1075 |
rel->r_offset - start_offset, name, addend); |
1076 |
break;
|
1077 |
case R_ARM_PC24:
|
1078 |
fprintf(outfile, " arm_reloc_pc24((uint32_t *)(gen_code_ptr + %d), 0x%x, %s);\n",
|
1079 |
rel->r_offset - start_offset, addend, name); |
1080 |
break;
|
1081 |
default:
|
1082 |
error("unsupported arm relocation (%d)", type);
|
1083 |
} |
1084 |
} |
1085 |
} |
1086 |
} |
1087 |
#elif defined(HOST_M68K)
|
1088 |
{ |
1089 |
char name[256]; |
1090 |
int type;
|
1091 |
int addend;
|
1092 |
Elf32_Sym *sym; |
1093 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
1094 |
if (rel->r_offset >= start_offset &&
|
1095 |
rel->r_offset < start_offset + copy_size) { |
1096 |
sym = &(symtab[ELFW(R_SYM)(rel->r_info)]); |
1097 |
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
1098 |
if (strstart(sym_name, "__op_param", &p)) { |
1099 |
snprintf(name, sizeof(name), "param%s", p); |
1100 |
} else {
|
1101 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
1102 |
} |
1103 |
type = ELF32_R_TYPE(rel->r_info); |
1104 |
addend = get32((uint32_t *)(text + rel->r_offset)) + rel->r_addend; |
1105 |
switch(type) {
|
1106 |
case R_68K_32:
|
1107 |
fprintf(outfile, " /* R_68K_32 RELOC, offset %x */\n", rel->r_offset) ;
|
1108 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %#x;\n",
|
1109 |
rel->r_offset - start_offset, name, addend ); |
1110 |
break;
|
1111 |
case R_68K_PC32:
|
1112 |
fprintf(outfile, " /* R_68K_PC32 RELOC, offset %x */\n", rel->r_offset);
|
1113 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %#x) + %#x;\n",
|
1114 |
rel->r_offset - start_offset, name, rel->r_offset - start_offset, /*sym->st_value+*/ addend);
|
1115 |
break;
|
1116 |
default:
|
1117 |
error("unsupported m68k relocation (%d)", type);
|
1118 |
} |
1119 |
} |
1120 |
} |
1121 |
} |
1122 |
#else
|
1123 |
#error unsupported CPU
|
1124 |
#endif
|
1125 |
fprintf(outfile, " gen_code_ptr += %d;\n", copy_size);
|
1126 |
fprintf(outfile, "}\n");
|
1127 |
fprintf(outfile, "break;\n\n");
|
1128 |
} else {
|
1129 |
fprintf(outfile, "static inline void gen_%s(", name);
|
1130 |
if (nb_args == 0) { |
1131 |
fprintf(outfile, "void");
|
1132 |
} else {
|
1133 |
for(i = 0; i < nb_args; i++) { |
1134 |
if (i != 0) |
1135 |
fprintf(outfile, ", ");
|
1136 |
fprintf(outfile, "long param%d", i + 1); |
1137 |
} |
1138 |
} |
1139 |
fprintf(outfile, ")\n");
|
1140 |
fprintf(outfile, "{\n");
|
1141 |
for(i = 0; i < nb_args; i++) { |
1142 |
fprintf(outfile, " *gen_opparam_ptr++ = param%d;\n", i + 1); |
1143 |
} |
1144 |
fprintf(outfile, " *gen_opc_ptr++ = INDEX_%s;\n", name);
|
1145 |
fprintf(outfile, "}\n\n");
|
1146 |
} |
1147 |
} |
1148 |
|
1149 |
/* load an elf object file */
|
1150 |
int load_elf(const char *filename, FILE *outfile, int out_type) |
1151 |
{ |
1152 |
int fd;
|
1153 |
struct elf_shdr *sec, *symtab_sec, *strtab_sec, *text_sec;
|
1154 |
int i, j;
|
1155 |
ElfW(Sym) *sym; |
1156 |
char *shstr;
|
1157 |
uint8_t *text; |
1158 |
ELF_RELOC *relocs; |
1159 |
int nb_relocs;
|
1160 |
ELF_RELOC *rel; |
1161 |
|
1162 |
fd = open(filename, O_RDONLY); |
1163 |
if (fd < 0) |
1164 |
error("can't open file '%s'", filename);
|
1165 |
|
1166 |
/* Read ELF header. */
|
1167 |
if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr)) |
1168 |
error("unable to read file header");
|
1169 |
|
1170 |
/* Check ELF identification. */
|
1171 |
if (ehdr.e_ident[EI_MAG0] != ELFMAG0
|
1172 |
|| ehdr.e_ident[EI_MAG1] != ELFMAG1 |
1173 |
|| ehdr.e_ident[EI_MAG2] != ELFMAG2 |
1174 |
|| ehdr.e_ident[EI_MAG3] != ELFMAG3 |
1175 |
|| ehdr.e_ident[EI_VERSION] != EV_CURRENT) { |
1176 |
error("bad ELF header");
|
1177 |
} |
1178 |
|
1179 |
do_swap = elf_must_swap(&ehdr); |
1180 |
if (do_swap)
|
1181 |
elf_swap_ehdr(&ehdr); |
1182 |
if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
|
1183 |
error("Unsupported ELF class");
|
1184 |
if (ehdr.e_type != ET_REL)
|
1185 |
error("ELF object file expected");
|
1186 |
if (ehdr.e_version != EV_CURRENT)
|
1187 |
error("Invalid ELF version");
|
1188 |
if (!elf_check_arch(ehdr.e_machine))
|
1189 |
error("Unsupported CPU (e_machine=%d)", ehdr.e_machine);
|
1190 |
|
1191 |
/* read section headers */
|
1192 |
shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr)); |
1193 |
if (do_swap) {
|
1194 |
for(i = 0; i < ehdr.e_shnum; i++) { |
1195 |
elf_swap_shdr(&shdr[i]); |
1196 |
} |
1197 |
} |
1198 |
|
1199 |
/* read all section data */
|
1200 |
sdata = malloc(sizeof(void *) * ehdr.e_shnum); |
1201 |
memset(sdata, 0, sizeof(void *) * ehdr.e_shnum); |
1202 |
|
1203 |
for(i = 0;i < ehdr.e_shnum; i++) { |
1204 |
sec = &shdr[i]; |
1205 |
if (sec->sh_type != SHT_NOBITS)
|
1206 |
sdata[i] = load_data(fd, sec->sh_offset, sec->sh_size); |
1207 |
} |
1208 |
|
1209 |
sec = &shdr[ehdr.e_shstrndx]; |
1210 |
shstr = sdata[ehdr.e_shstrndx]; |
1211 |
|
1212 |
/* swap relocations */
|
1213 |
for(i = 0; i < ehdr.e_shnum; i++) { |
1214 |
sec = &shdr[i]; |
1215 |
if (sec->sh_type == SHT_RELOC) {
|
1216 |
nb_relocs = sec->sh_size / sec->sh_entsize; |
1217 |
if (do_swap) {
|
1218 |
for(j = 0, rel = (ELF_RELOC *)sdata[i]; j < nb_relocs; j++, rel++) |
1219 |
elf_swap_rel(rel); |
1220 |
} |
1221 |
} |
1222 |
} |
1223 |
/* text section */
|
1224 |
|
1225 |
text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
|
1226 |
if (!text_sec)
|
1227 |
error("could not find .text section");
|
1228 |
text_shndx = text_sec - shdr; |
1229 |
text = sdata[text_shndx]; |
1230 |
|
1231 |
/* find text relocations, if any */
|
1232 |
relocs = NULL;
|
1233 |
nb_relocs = 0;
|
1234 |
i = find_reloc(text_shndx); |
1235 |
if (i != 0) { |
1236 |
relocs = (ELF_RELOC *)sdata[i]; |
1237 |
nb_relocs = shdr[i].sh_size / shdr[i].sh_entsize; |
1238 |
} |
1239 |
|
1240 |
symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
|
1241 |
if (!symtab_sec)
|
1242 |
error("could not find .symtab section");
|
1243 |
strtab_sec = &shdr[symtab_sec->sh_link]; |
1244 |
|
1245 |
symtab = (ElfW(Sym) *)sdata[symtab_sec - shdr]; |
1246 |
strtab = sdata[symtab_sec->sh_link]; |
1247 |
|
1248 |
nb_syms = symtab_sec->sh_size / sizeof(ElfW(Sym));
|
1249 |
if (do_swap) {
|
1250 |
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
1251 |
swab32s(&sym->st_name); |
1252 |
swabls(&sym->st_value); |
1253 |
swabls(&sym->st_size); |
1254 |
swab16s(&sym->st_shndx); |
1255 |
} |
1256 |
} |
1257 |
|
1258 |
if (out_type == OUT_INDEX_OP) {
|
1259 |
fprintf(outfile, "DEF(end, 0, 0)\n");
|
1260 |
fprintf(outfile, "DEF(nop, 0, 0)\n");
|
1261 |
fprintf(outfile, "DEF(nop1, 1, 0)\n");
|
1262 |
fprintf(outfile, "DEF(nop2, 2, 0)\n");
|
1263 |
fprintf(outfile, "DEF(nop3, 3, 0)\n");
|
1264 |
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
1265 |
const char *name, *p; |
1266 |
name = strtab + sym->st_name; |
1267 |
if (strstart(name, OP_PREFIX, &p)) {
|
1268 |
gen_code(name, sym->st_value, sym->st_size, outfile, |
1269 |
text, relocs, nb_relocs, 2);
|
1270 |
} |
1271 |
} |
1272 |
} else if (out_type == OUT_GEN_OP) { |
1273 |
/* generate gen_xxx functions */
|
1274 |
|
1275 |
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
1276 |
const char *name; |
1277 |
name = strtab + sym->st_name; |
1278 |
if (strstart(name, OP_PREFIX, NULL)) { |
1279 |
if (sym->st_shndx != (text_sec - shdr))
|
1280 |
error("invalid section for opcode (0x%x)", sym->st_shndx);
|
1281 |
gen_code(name, sym->st_value, sym->st_size, outfile, |
1282 |
text, relocs, nb_relocs, 0);
|
1283 |
} |
1284 |
} |
1285 |
|
1286 |
} else {
|
1287 |
/* generate big code generation switch */
|
1288 |
fprintf(outfile, |
1289 |
"int dyngen_code(uint8_t *gen_code_buf,\n"
|
1290 |
" uint16_t *label_offsets, uint16_t *jmp_offsets,\n"
|
1291 |
" const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
|
1292 |
"{\n"
|
1293 |
" uint8_t *gen_code_ptr;\n"
|
1294 |
" const uint16_t *opc_ptr;\n"
|
1295 |
" const uint32_t *opparam_ptr;\n");
|
1296 |
|
1297 |
#ifdef HOST_ARM
|
1298 |
fprintf(outfile, |
1299 |
" uint8_t *last_gen_code_ptr = gen_code_buf;\n"
|
1300 |
" LDREntry *arm_ldr_ptr = arm_ldr_table;\n"
|
1301 |
" uint32_t *arm_data_ptr = arm_data_table;\n");
|
1302 |
#endif
|
1303 |
|
1304 |
fprintf(outfile, |
1305 |
"\n"
|
1306 |
" gen_code_ptr = gen_code_buf;\n"
|
1307 |
" opc_ptr = opc_buf;\n"
|
1308 |
" opparam_ptr = opparam_buf;\n");
|
1309 |
|
1310 |
/* Generate prologue, if needed. */
|
1311 |
|
1312 |
fprintf(outfile, |
1313 |
" for(;;) {\n"
|
1314 |
" switch(*opc_ptr++) {\n"
|
1315 |
); |
1316 |
|
1317 |
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
1318 |
const char *name; |
1319 |
name = strtab + sym->st_name; |
1320 |
if (strstart(name, OP_PREFIX, NULL)) { |
1321 |
#if 0
|
1322 |
printf("%4d: %s pos=0x%08x len=%d\n",
|
1323 |
i, name, sym->st_value, sym->st_size);
|
1324 |
#endif
|
1325 |
if (sym->st_shndx != (text_sec - shdr))
|
1326 |
error("invalid section for opcode (0x%x)", sym->st_shndx);
|
1327 |
gen_code(name, sym->st_value, sym->st_size, outfile, |
1328 |
text, relocs, nb_relocs, 1);
|
1329 |
} |
1330 |
} |
1331 |
|
1332 |
fprintf(outfile, |
1333 |
" case INDEX_op_nop:\n"
|
1334 |
" break;\n"
|
1335 |
" case INDEX_op_nop1:\n"
|
1336 |
" opparam_ptr++;\n"
|
1337 |
" break;\n"
|
1338 |
" case INDEX_op_nop2:\n"
|
1339 |
" opparam_ptr += 2;\n"
|
1340 |
" break;\n"
|
1341 |
" case INDEX_op_nop3:\n"
|
1342 |
" opparam_ptr += 3;\n"
|
1343 |
" break;\n"
|
1344 |
" default:\n"
|
1345 |
" goto the_end;\n"
|
1346 |
" }\n");
|
1347 |
|
1348 |
#ifdef HOST_ARM
|
1349 |
/* generate constant table if needed */
|
1350 |
fprintf(outfile, |
1351 |
" if ((gen_code_ptr - last_gen_code_ptr) >= (MAX_FRAG_SIZE - MAX_OP_SIZE)) {\n"
|
1352 |
" gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 1);\n"
|
1353 |
" last_gen_code_ptr = gen_code_ptr;\n"
|
1354 |
" arm_ldr_ptr = arm_ldr_table;\n"
|
1355 |
" arm_data_ptr = arm_data_table;\n"
|
1356 |
" }\n");
|
1357 |
#endif
|
1358 |
|
1359 |
|
1360 |
fprintf(outfile, |
1361 |
" }\n"
|
1362 |
" the_end:\n"
|
1363 |
); |
1364 |
|
1365 |
/* generate some code patching */
|
1366 |
#ifdef HOST_ARM
|
1367 |
fprintf(outfile, "gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 0);\n");
|
1368 |
#endif
|
1369 |
/* flush instruction cache */
|
1370 |
fprintf(outfile, "flush_icache_range((unsigned long)gen_code_buf, (unsigned long)gen_code_ptr);\n");
|
1371 |
|
1372 |
fprintf(outfile, "return gen_code_ptr - gen_code_buf;\n");
|
1373 |
fprintf(outfile, "}\n\n");
|
1374 |
|
1375 |
} |
1376 |
|
1377 |
close(fd); |
1378 |
return 0; |
1379 |
} |
1380 |
|
1381 |
void usage(void) |
1382 |
{ |
1383 |
printf("dyngen (c) 2003 Fabrice Bellard\n"
|
1384 |
"usage: dyngen [-o outfile] [-c] objfile\n"
|
1385 |
"Generate a dynamic code generator from an object file\n"
|
1386 |
"-c output enum of operations\n"
|
1387 |
"-g output gen_op_xx() functions\n"
|
1388 |
); |
1389 |
exit(1);
|
1390 |
} |
1391 |
|
1392 |
int main(int argc, char **argv) |
1393 |
{ |
1394 |
int c, out_type;
|
1395 |
const char *filename, *outfilename; |
1396 |
FILE *outfile; |
1397 |
|
1398 |
outfilename = "out.c";
|
1399 |
out_type = OUT_CODE; |
1400 |
for(;;) {
|
1401 |
c = getopt(argc, argv, "ho:cg");
|
1402 |
if (c == -1) |
1403 |
break;
|
1404 |
switch(c) {
|
1405 |
case 'h': |
1406 |
usage(); |
1407 |
break;
|
1408 |
case 'o': |
1409 |
outfilename = optarg; |
1410 |
break;
|
1411 |
case 'c': |
1412 |
out_type = OUT_INDEX_OP; |
1413 |
break;
|
1414 |
case 'g': |
1415 |
out_type = OUT_GEN_OP; |
1416 |
break;
|
1417 |
} |
1418 |
} |
1419 |
if (optind >= argc)
|
1420 |
usage(); |
1421 |
filename = argv[optind]; |
1422 |
outfile = fopen(outfilename, "w");
|
1423 |
if (!outfile)
|
1424 |
error("could not open '%s'", outfilename);
|
1425 |
load_elf(filename, outfile, out_type); |
1426 |
fclose(outfile); |
1427 |
return 0; |
1428 |
} |