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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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#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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#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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#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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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)) __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); |
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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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case EM_ALPHA:
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{ |
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uint8_t *p; |
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p = 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) != 0x6bfa8001) |
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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_IA_64:
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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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/* br.ret.sptk.many b0;; */
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/* 08 00 84 00 */
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if (get32((uint32_t *)p) != 0x00840008) |
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error("br.ret.sptk.many b0;; 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_SPARC:
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case EM_SPARC32PLUS:
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{ |
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uint8_t *p; |
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p = (void *)(p_end - 8); |
348 |
if (p <= p_start)
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error("empty code for %s", name);
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if (get32((uint32_t *)(p_start + 0x0)) != 0x9de3bf98) |
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error("save %%sp,-104,%%sp expected at the start of %s "
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"found [%08x]",
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name, get32((uint32_t *)(p_start + 0x0)));
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if (get32((uint32_t *)(p + 0x0)) != 0x81c7e008 || |
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get32((uint32_t *)(p + 0x4)) != 0x81e80000) |
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error("ret; restore; expected at the end of %s found [%08x:%08x]",
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name, |
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get32((uint32_t *)(p + 0x0)),
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get32((uint32_t *)(p + 0x4)));
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copy_size = p - p_start; |
362 |
} |
363 |
break;
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364 |
case EM_SPARCV9:
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{ |
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uint8_t *p; |
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p = (void *)(p_end - 8); |
368 |
if (p <= p_start)
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error("empty code for %s", name);
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if (get32((uint32_t *)(p_start + 0x0)) != 0x9de3bf40) |
371 |
error("save %%sp,-192,%%sp expected at the start of %s "
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"found [%08x]",
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name, get32((uint32_t *)(p_start + 0x0)));
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if (get32((uint32_t *)(p + 0x0)) != 0x81cfe008 || |
375 |
get32((uint32_t *)(p + 0x4)) != 0x01000000) |
376 |
error("rett %%i7+8; nop; expected at the end of %s "
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"found [%08x:%08x]",
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name, |
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get32((uint32_t *)(p + 0x0)),
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get32((uint32_t *)(p + 0x4)));
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copy_size = p - p_start; |
382 |
} |
383 |
break;
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384 |
default:
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385 |
error("unknown ELF architecture");
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386 |
} |
387 |
|
388 |
/* compute the number of arguments by looking at the relocations */
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389 |
for(i = 0;i < MAX_ARGS; i++) |
390 |
args_present[i] = 0;
|
391 |
|
392 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
393 |
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
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394 |
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
395 |
if (strstart(sym_name, "__op_param", &p)) { |
396 |
n = strtoul(p, NULL, 10); |
397 |
if (n >= MAX_ARGS)
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398 |
error("too many arguments in %s", name);
|
399 |
args_present[n - 1] = 1; |
400 |
} |
401 |
} |
402 |
} |
403 |
|
404 |
nb_args = 0;
|
405 |
while (nb_args < MAX_ARGS && args_present[nb_args])
|
406 |
nb_args++; |
407 |
for(i = nb_args; i < MAX_ARGS; i++) {
|
408 |
if (args_present[i])
|
409 |
error("inconsistent argument numbering in %s", name);
|
410 |
} |
411 |
|
412 |
if (gen_switch == 2) { |
413 |
fprintf(outfile, "DEF(%s, %d)\n", name + 3, nb_args); |
414 |
} else if (gen_switch == 1) { |
415 |
|
416 |
/* output C code */
|
417 |
fprintf(outfile, "case INDEX_%s: {\n", name);
|
418 |
if (nb_args > 0) { |
419 |
fprintf(outfile, " long ");
|
420 |
for(i = 0; i < nb_args; i++) { |
421 |
if (i != 0) |
422 |
fprintf(outfile, ", ");
|
423 |
fprintf(outfile, "param%d", i + 1); |
424 |
} |
425 |
fprintf(outfile, ";\n");
|
426 |
} |
427 |
fprintf(outfile, " extern void %s();\n", name);
|
428 |
|
429 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
430 |
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
|
431 |
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
432 |
if (!strstart(sym_name, "__op_param", &p)) { |
433 |
#if defined(HOST_SPARC)
|
434 |
if (sym_name[0] == '.') { |
435 |
fprintf(outfile, |
436 |
"extern char __dot_%s __asm__(\"%s\");\n",
|
437 |
sym_name+1, sym_name);
|
438 |
continue;
|
439 |
} |
440 |
#endif
|
441 |
fprintf(outfile, "extern char %s;\n", sym_name);
|
442 |
} |
443 |
} |
444 |
} |
445 |
|
446 |
fprintf(outfile, " memcpy(gen_code_ptr, &%s, %d);\n", name, copy_size);
|
447 |
for(i = 0; i < nb_args; i++) { |
448 |
fprintf(outfile, " param%d = *opparam_ptr++;\n", i + 1); |
449 |
} |
450 |
|
451 |
/* patch relocations */
|
452 |
#if defined(HOST_I386)
|
453 |
{ |
454 |
char name[256]; |
455 |
int type;
|
456 |
int addend;
|
457 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
458 |
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
|
459 |
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
460 |
if (strstart(sym_name, "__op_param", &p)) { |
461 |
snprintf(name, sizeof(name), "param%s", p); |
462 |
} else {
|
463 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
464 |
} |
465 |
type = ELF32_R_TYPE(rel->r_info); |
466 |
addend = get32((uint32_t *)(text + rel->r_offset)); |
467 |
switch(type) {
|
468 |
case R_386_32:
|
469 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
470 |
rel->r_offset - offset, name, addend); |
471 |
break;
|
472 |
case R_386_PC32:
|
473 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
|
474 |
rel->r_offset - offset, name, rel->r_offset - offset, addend); |
475 |
break;
|
476 |
default:
|
477 |
error("unsupported i386 relocation (%d)", type);
|
478 |
} |
479 |
} |
480 |
} |
481 |
} |
482 |
#elif defined(HOST_PPC)
|
483 |
{ |
484 |
char name[256]; |
485 |
int type;
|
486 |
int addend;
|
487 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
488 |
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
|
489 |
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
490 |
if (strstart(sym_name, "__op_param", &p)) { |
491 |
snprintf(name, sizeof(name), "param%s", p); |
492 |
} else {
|
493 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
494 |
} |
495 |
type = ELF32_R_TYPE(rel->r_info); |
496 |
addend = rel->r_addend; |
497 |
switch(type) {
|
498 |
case R_PPC_ADDR32:
|
499 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
500 |
rel->r_offset - offset, name, addend); |
501 |
break;
|
502 |
case R_PPC_ADDR16_LO:
|
503 |
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
|
504 |
rel->r_offset - offset, name, addend); |
505 |
break;
|
506 |
case R_PPC_ADDR16_HI:
|
507 |
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
|
508 |
rel->r_offset - offset, name, addend); |
509 |
break;
|
510 |
case R_PPC_ADDR16_HA:
|
511 |
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
|
512 |
rel->r_offset - offset, name, addend); |
513 |
break;
|
514 |
case R_PPC_REL24:
|
515 |
/* warning: must be at 32 MB distancy */
|
516 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
|
517 |
rel->r_offset - offset, rel->r_offset - offset, name, rel->r_offset - offset, addend); |
518 |
break;
|
519 |
default:
|
520 |
error("unsupported powerpc relocation (%d)", type);
|
521 |
} |
522 |
} |
523 |
} |
524 |
} |
525 |
#elif defined(HOST_S390)
|
526 |
{ |
527 |
char name[256]; |
528 |
int type;
|
529 |
int addend;
|
530 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
531 |
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
|
532 |
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; |
533 |
if (strstart(sym_name, "__op_param", &p)) { |
534 |
snprintf(name, sizeof(name), "param%s", p); |
535 |
} else {
|
536 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
537 |
} |
538 |
type = ELF32_R_TYPE(rel->r_info); |
539 |
addend = rel->r_addend; |
540 |
switch(type) {
|
541 |
case R_390_32:
|
542 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
543 |
rel->r_offset - offset, name, addend); |
544 |
break;
|
545 |
case R_390_16:
|
546 |
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
547 |
rel->r_offset - offset, name, addend); |
548 |
break;
|
549 |
case R_390_8:
|
550 |
fprintf(outfile, " *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
551 |
rel->r_offset - offset, name, addend); |
552 |
break;
|
553 |
default:
|
554 |
error("unsupported s390 relocation (%d)", type);
|
555 |
} |
556 |
} |
557 |
} |
558 |
} |
559 |
#elif defined(HOST_ALPHA)
|
560 |
{ |
561 |
for (i = 0, rel = relocs; i < nb_relocs; i++, rel++) { |
562 |
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
|
563 |
int type;
|
564 |
sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name; |
565 |
|
566 |
type = ELF64_R_TYPE(rel->r_info); |
567 |
switch (type) {
|
568 |
case R_ALPHA_GPDISP:
|
569 |
/* Instructions to set up the gp can be nopped, since we keep it current
|
570 |
all the time. FIXME assert that target is really gp */
|
571 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = 0x2ffe0000; /* unop */\n",
|
572 |
rel->r_offset - offset); |
573 |
break;
|
574 |
case R_ALPHA_LITUSE:
|
575 |
/* jsr to literal hint. Could be used to optimize to bsr. Ignore for
|
576 |
now, since some called functions (libc) need pv to be set up. */
|
577 |
break;
|
578 |
case R_ALPHA_HINT:
|
579 |
/* Branch target prediction hint. Ignore for now. Should be already
|
580 |
correct for in-function jumps. */
|
581 |
break;
|
582 |
case R_ALPHA_LITERAL:
|
583 |
/* Load a literal from the GOT relative to the gp. Need to patch the
|
584 |
16-bit immediate offset. */
|
585 |
fprintf(outfile, " *(int16_t *)(gen_code_ptr + %d) = gp - (long)(&%s);\n",
|
586 |
rel->r_offset - offset, name); |
587 |
break;
|
588 |
default:
|
589 |
error("unsupported Alpha relocation (%d)", type);
|
590 |
} |
591 |
} |
592 |
} |
593 |
} |
594 |
#elif defined(HOST_IA64)
|
595 |
{ |
596 |
char name[256]; |
597 |
int type;
|
598 |
int addend;
|
599 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
600 |
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
|
601 |
sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name; |
602 |
if (strstart(sym_name, "__op_param", &p)) { |
603 |
snprintf(name, sizeof(name), "param%s", p); |
604 |
} else {
|
605 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
606 |
} |
607 |
type = ELF64_R_TYPE(rel->r_info); |
608 |
addend = rel->r_addend; |
609 |
switch(type) {
|
610 |
case R_IA64_LTOFF22:
|
611 |
error("must implemnt R_IA64_LTOFF22 relocation");
|
612 |
case R_IA64_PCREL21B:
|
613 |
error("must implemnt R_IA64_PCREL21B relocation");
|
614 |
default:
|
615 |
error("unsupported ia64 relocation (%d)", type);
|
616 |
} |
617 |
} |
618 |
} |
619 |
} |
620 |
#elif defined(HOST_SPARC)
|
621 |
{ |
622 |
char name[256]; |
623 |
int type;
|
624 |
int addend;
|
625 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
626 |
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
|
627 |
sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name; |
628 |
if (strstart(sym_name, "__op_param", &p)) { |
629 |
snprintf(name, sizeof(name), "param%s", p); |
630 |
} else {
|
631 |
if (sym_name[0] == '.') |
632 |
snprintf(name, sizeof(name),
|
633 |
"(long)(&__dot_%s)",
|
634 |
sym_name + 1);
|
635 |
else
|
636 |
snprintf(name, sizeof(name),
|
637 |
"(long)(&%s)", sym_name);
|
638 |
} |
639 |
type = ELF32_R_TYPE(rel->r_info); |
640 |
addend = rel->r_addend; |
641 |
switch(type) {
|
642 |
case R_SPARC_32:
|
643 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
644 |
rel->r_offset - offset, name, addend); |
645 |
break;
|
646 |
case R_SPARC_HI22:
|
647 |
fprintf(outfile, |
648 |
" *(uint32_t *)(gen_code_ptr + %d) = "
|
649 |
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
650 |
" & ~0x3fffff) "
|
651 |
" | ((%s + %d) & 0x3fffff);\n",
|
652 |
rel->r_offset - offset, |
653 |
rel->r_offset - offset, |
654 |
name, addend); |
655 |
break;
|
656 |
case R_SPARC_LO10:
|
657 |
fprintf(outfile, |
658 |
" *(uint32_t *)(gen_code_ptr + %d) = "
|
659 |
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
660 |
" & ~0x3ff) "
|
661 |
" | ((%s + %d) & 0x3ff);\n",
|
662 |
rel->r_offset - offset, |
663 |
rel->r_offset - offset, |
664 |
name, addend); |
665 |
break;
|
666 |
case R_SPARC_WDISP30:
|
667 |
fprintf(outfile, |
668 |
" *(uint32_t *)(gen_code_ptr + %d) = "
|
669 |
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
670 |
" & ~0x3fffffff) "
|
671 |
" | ((((%s + %d) - (long)gen_code_ptr)>>2) "
|
672 |
" & 0x3fffffff);\n",
|
673 |
rel->r_offset - offset, |
674 |
rel->r_offset - offset, |
675 |
name, addend); |
676 |
break;
|
677 |
default:
|
678 |
error("unsupported sparc relocation (%d)", type);
|
679 |
} |
680 |
} |
681 |
} |
682 |
} |
683 |
#elif defined(HOST_SPARC64)
|
684 |
{ |
685 |
char name[256]; |
686 |
int type;
|
687 |
int addend;
|
688 |
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
689 |
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
|
690 |
sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name; |
691 |
if (strstart(sym_name, "__op_param", &p)) { |
692 |
snprintf(name, sizeof(name), "param%s", p); |
693 |
} else {
|
694 |
snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
695 |
} |
696 |
type = ELF64_R_TYPE(rel->r_info); |
697 |
addend = rel->r_addend; |
698 |
switch(type) {
|
699 |
case R_SPARC_32:
|
700 |
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
701 |
rel->r_offset - offset, name, addend); |
702 |
break;
|
703 |
case R_SPARC_HI22:
|
704 |
fprintf(outfile, |
705 |
" *(uint32_t *)(gen_code_ptr + %d) = "
|
706 |
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
707 |
" & ~0x3fffff) "
|
708 |
" | ((%s + %d) & 0x3fffff);\n",
|
709 |
rel->r_offset - offset, |
710 |
rel->r_offset - offset, |
711 |
name, addend); |
712 |
break;
|
713 |
case R_SPARC_LO10:
|
714 |
fprintf(outfile, |
715 |
" *(uint32_t *)(gen_code_ptr + %d) = "
|
716 |
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
717 |
" & ~0x3ff) "
|
718 |
" | ((%s + %d) & 0x3ff);\n",
|
719 |
rel->r_offset - offset, |
720 |
rel->r_offset - offset, |
721 |
name, addend); |
722 |
break;
|
723 |
case R_SPARC_WDISP30:
|
724 |
fprintf(outfile, |
725 |
" *(uint32_t *)(gen_code_ptr + %d) = "
|
726 |
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
727 |
" & ~0x3fffffff) "
|
728 |
" | ((((%s + %d) - (long)gen_code_ptr)>>2) "
|
729 |
" & 0x3fffffff);\n",
|
730 |
rel->r_offset - offset, |
731 |
rel->r_offset - offset, |
732 |
name, addend); |
733 |
break;
|
734 |
default:
|
735 |
error("unsupported sparc64 relocation (%d)", type);
|
736 |
} |
737 |
} |
738 |
} |
739 |
} |
740 |
#else
|
741 |
#error unsupported CPU
|
742 |
#endif
|
743 |
fprintf(outfile, " gen_code_ptr += %d;\n", copy_size);
|
744 |
fprintf(outfile, "}\n");
|
745 |
fprintf(outfile, "break;\n\n");
|
746 |
} else {
|
747 |
fprintf(outfile, "static inline void gen_%s(", name);
|
748 |
if (nb_args == 0) { |
749 |
fprintf(outfile, "void");
|
750 |
} else {
|
751 |
for(i = 0; i < nb_args; i++) { |
752 |
if (i != 0) |
753 |
fprintf(outfile, ", ");
|
754 |
fprintf(outfile, "long param%d", i + 1); |
755 |
} |
756 |
} |
757 |
fprintf(outfile, ")\n");
|
758 |
fprintf(outfile, "{\n");
|
759 |
for(i = 0; i < nb_args; i++) { |
760 |
fprintf(outfile, " *gen_opparam_ptr++ = param%d;\n", i + 1); |
761 |
} |
762 |
fprintf(outfile, " *gen_opc_ptr++ = INDEX_%s;\n", name);
|
763 |
fprintf(outfile, "}\n\n");
|
764 |
} |
765 |
} |
766 |
|
767 |
/* load an elf object file */
|
768 |
int load_elf(const char *filename, FILE *outfile, int do_print_enum) |
769 |
{ |
770 |
int fd;
|
771 |
struct elfhdr ehdr;
|
772 |
struct elf_shdr *sec, *shdr, *symtab_sec, *strtab_sec, *text_sec;
|
773 |
int i, j, nb_syms;
|
774 |
ElfW(Sym) *symtab, *sym; |
775 |
char *shstr, *strtab;
|
776 |
uint8_t *text; |
777 |
void *relocs;
|
778 |
int nb_relocs, reloc_sh_type;
|
779 |
|
780 |
fd = open(filename, O_RDONLY); |
781 |
if (fd < 0) |
782 |
error("can't open file '%s'", filename);
|
783 |
|
784 |
/* Read ELF header. */
|
785 |
if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr)) |
786 |
error("unable to read file header");
|
787 |
|
788 |
/* Check ELF identification. */
|
789 |
if (ehdr.e_ident[EI_MAG0] != ELFMAG0
|
790 |
|| ehdr.e_ident[EI_MAG1] != ELFMAG1 |
791 |
|| ehdr.e_ident[EI_MAG2] != ELFMAG2 |
792 |
|| ehdr.e_ident[EI_MAG3] != ELFMAG3 |
793 |
|| ehdr.e_ident[EI_VERSION] != EV_CURRENT) { |
794 |
error("bad ELF header");
|
795 |
} |
796 |
|
797 |
do_swap = elf_must_swap(&ehdr); |
798 |
if (do_swap)
|
799 |
elf_swap_ehdr(&ehdr); |
800 |
if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
|
801 |
error("Unsupported ELF class");
|
802 |
if (ehdr.e_type != ET_REL)
|
803 |
error("ELF object file expected");
|
804 |
if (ehdr.e_version != EV_CURRENT)
|
805 |
error("Invalid ELF version");
|
806 |
if (!elf_check_arch(ehdr.e_machine))
|
807 |
error("Unsupported CPU (e_machine=%d)", ehdr.e_machine);
|
808 |
|
809 |
/* read section headers */
|
810 |
shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr)); |
811 |
if (do_swap) {
|
812 |
for(i = 0; i < ehdr.e_shnum; i++) { |
813 |
elf_swap_shdr(&shdr[i]); |
814 |
} |
815 |
} |
816 |
|
817 |
sec = &shdr[ehdr.e_shstrndx]; |
818 |
shstr = load_data(fd, sec->sh_offset, sec->sh_size); |
819 |
|
820 |
/* text section */
|
821 |
|
822 |
text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
|
823 |
if (!text_sec)
|
824 |
error("could not find .text section");
|
825 |
text = load_data(fd, text_sec->sh_offset, text_sec->sh_size); |
826 |
|
827 |
/* find text relocations, if any */
|
828 |
nb_relocs = 0;
|
829 |
relocs = NULL;
|
830 |
reloc_sh_type = 0;
|
831 |
for(i = 0; i < ehdr.e_shnum; i++) { |
832 |
sec = &shdr[i]; |
833 |
if ((sec->sh_type == SHT_REL || sec->sh_type == SHT_RELA) &&
|
834 |
sec->sh_info == (text_sec - shdr)) { |
835 |
reloc_sh_type = sec->sh_type; |
836 |
relocs = load_data(fd, sec->sh_offset, sec->sh_size); |
837 |
nb_relocs = sec->sh_size / sec->sh_entsize; |
838 |
if (do_swap) {
|
839 |
if (sec->sh_type == SHT_REL) {
|
840 |
ElfW(Rel) *rel = relocs; |
841 |
for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) { |
842 |
swabls(&rel->r_offset); |
843 |
swabls(&rel->r_info); |
844 |
} |
845 |
} else {
|
846 |
ElfW(Rela) *rel = relocs; |
847 |
for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) { |
848 |
swabls(&rel->r_offset); |
849 |
swabls(&rel->r_info); |
850 |
swabls(&rel->r_addend); |
851 |
} |
852 |
} |
853 |
} |
854 |
break;
|
855 |
} |
856 |
} |
857 |
|
858 |
symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
|
859 |
if (!symtab_sec)
|
860 |
error("could not find .symtab section");
|
861 |
strtab_sec = &shdr[symtab_sec->sh_link]; |
862 |
|
863 |
symtab = load_data(fd, symtab_sec->sh_offset, symtab_sec->sh_size); |
864 |
strtab = load_data(fd, strtab_sec->sh_offset, strtab_sec->sh_size); |
865 |
|
866 |
nb_syms = symtab_sec->sh_size / sizeof(ElfW(Sym));
|
867 |
if (do_swap) {
|
868 |
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
869 |
swab32s(&sym->st_name); |
870 |
swabls(&sym->st_value); |
871 |
swabls(&sym->st_size); |
872 |
swab16s(&sym->st_shndx); |
873 |
} |
874 |
} |
875 |
|
876 |
if (do_print_enum) {
|
877 |
fprintf(outfile, "DEF(end, 0)\n");
|
878 |
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
879 |
const char *name, *p; |
880 |
name = strtab + sym->st_name; |
881 |
if (strstart(name, OP_PREFIX, &p)) {
|
882 |
gen_code(name, sym->st_value, sym->st_size, outfile, |
883 |
text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 2);
|
884 |
} |
885 |
} |
886 |
} else {
|
887 |
/* generate big code generation switch */
|
888 |
#ifdef HOST_ALPHA
|
889 |
fprintf(outfile, "register long gp asm(\"%%$29\");\n");
|
890 |
#endif
|
891 |
fprintf(outfile, |
892 |
"int dyngen_code(uint8_t *gen_code_buf,\n"
|
893 |
" const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
|
894 |
"{\n"
|
895 |
" uint8_t *gen_code_ptr;\n"
|
896 |
" const uint16_t *opc_ptr;\n"
|
897 |
" const uint32_t *opparam_ptr;\n"
|
898 |
" gen_code_ptr = gen_code_buf;\n"
|
899 |
" opc_ptr = opc_buf;\n"
|
900 |
" opparam_ptr = opparam_buf;\n"
|
901 |
" for(;;) {\n"
|
902 |
" switch(*opc_ptr++) {\n"
|
903 |
); |
904 |
|
905 |
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
906 |
const char *name; |
907 |
name = strtab + sym->st_name; |
908 |
if (strstart(name, OP_PREFIX, NULL)) { |
909 |
#if 0
|
910 |
printf("%4d: %s pos=0x%08x len=%d\n",
|
911 |
i, name, sym->st_value, sym->st_size);
|
912 |
#endif
|
913 |
if (sym->st_shndx != (text_sec - shdr))
|
914 |
error("invalid section for opcode (0x%x)", sym->st_shndx);
|
915 |
gen_code(name, sym->st_value, sym->st_size, outfile, |
916 |
text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 1);
|
917 |
} |
918 |
} |
919 |
|
920 |
fprintf(outfile, |
921 |
" default:\n"
|
922 |
" goto the_end;\n"
|
923 |
" }\n"
|
924 |
" }\n"
|
925 |
" the_end:\n"
|
926 |
); |
927 |
|
928 |
/* generate a return */
|
929 |
switch(ELF_ARCH) {
|
930 |
case EM_386:
|
931 |
fprintf(outfile, "*gen_code_ptr++ = 0xc3; /* ret */\n");
|
932 |
break;
|
933 |
case EM_PPC:
|
934 |
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
|
935 |
break;
|
936 |
case EM_S390:
|
937 |
fprintf(outfile, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n");
|
938 |
break;
|
939 |
case EM_ALPHA:
|
940 |
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x6bfa8001; /* ret */\n");
|
941 |
break;
|
942 |
case EM_IA_64:
|
943 |
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x00840008; /* br.ret.sptk.many b0;; */\n");
|
944 |
break;
|
945 |
case EM_SPARC:
|
946 |
case EM_SPARC32PLUS:
|
947 |
case EM_SPARCV9:
|
948 |
/* Fill the delay slot. */
|
949 |
fprintf(outfile, "*((uint32_t *)gen_code_ptr) = *((uint32_t *)gen_code_ptr - 1); /* delay slot */\n");
|
950 |
fprintf(outfile, "*((uint32_t *)gen_code_ptr - 1) = 0x81c3e008; /* retl */\n");
|
951 |
fprintf(outfile, "gen_code_ptr++;\n");
|
952 |
break;
|
953 |
default:
|
954 |
error("unknown ELF architecture");
|
955 |
} |
956 |
|
957 |
fprintf(outfile, "return gen_code_ptr - gen_code_buf;\n");
|
958 |
fprintf(outfile, "}\n\n");
|
959 |
|
960 |
/* generate gen_xxx functions */
|
961 |
/* XXX: suppress the use of these functions to simplify code */
|
962 |
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
963 |
const char *name; |
964 |
name = strtab + sym->st_name; |
965 |
if (strstart(name, OP_PREFIX, NULL)) { |
966 |
if (sym->st_shndx != (text_sec - shdr))
|
967 |
error("invalid section for opcode (0x%x)", sym->st_shndx);
|
968 |
gen_code(name, sym->st_value, sym->st_size, outfile, |
969 |
text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 0);
|
970 |
} |
971 |
} |
972 |
} |
973 |
|
974 |
close(fd); |
975 |
return 0; |
976 |
} |
977 |
|
978 |
void usage(void) |
979 |
{ |
980 |
printf("dyngen (c) 2003 Fabrice Bellard\n"
|
981 |
"usage: dyngen [-o outfile] [-c] objfile\n"
|
982 |
"Generate a dynamic code generator from an object file\n"
|
983 |
"-c output enum of operations\n"
|
984 |
); |
985 |
exit(1);
|
986 |
} |
987 |
|
988 |
int main(int argc, char **argv) |
989 |
{ |
990 |
int c, do_print_enum;
|
991 |
const char *filename, *outfilename; |
992 |
FILE *outfile; |
993 |
|
994 |
outfilename = "out.c";
|
995 |
do_print_enum = 0;
|
996 |
for(;;) {
|
997 |
c = getopt(argc, argv, "ho:c");
|
998 |
if (c == -1) |
999 |
break;
|
1000 |
switch(c) {
|
1001 |
case 'h': |
1002 |
usage(); |
1003 |
break;
|
1004 |
case 'o': |
1005 |
outfilename = optarg; |
1006 |
break;
|
1007 |
case 'c': |
1008 |
do_print_enum = 1;
|
1009 |
break;
|
1010 |
} |
1011 |
} |
1012 |
if (optind >= argc)
|
1013 |
usage(); |
1014 |
filename = argv[optind]; |
1015 |
outfile = fopen(outfilename, "w");
|
1016 |
if (!outfile)
|
1017 |
error("could not open '%s'", outfilename);
|
1018 |
load_elf(filename, outfile, do_print_enum); |
1019 |
fclose(outfile); |
1020 |
return 0; |
1021 |
} |