c1e42a1397
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@199 c046a42c-6fe2-441c-8c8c-71466251a162
1182 lines
39 KiB
C
1182 lines
39 KiB
C
/*
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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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/* ELF file info */
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int do_swap;
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struct elf_shdr *shdr;
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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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/* data section */
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uint8_t *data_data, *sdata_data;
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int data_shndx, sdata_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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}
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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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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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host_ulong start_offset;
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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 prologue and epilogue instructions.
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* Increment start_offset to skip epilogue instructions, then compute
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* copy_size the indicate the size of the remaining instructions (in
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* bytes).
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*/
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p_start = text + offset;
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p_end = p_start + size;
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start_offset = offset;
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switch(ELF_ARCH) {
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case EM_386:
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{
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int len;
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len = p_end - p_start;
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if (len == 0)
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error("empty code for %s", name);
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if (p_end[-1] == 0xc3) {
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len--;
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} else {
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error("ret or jmp expected at the end of %s", name);
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}
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copy_size = len;
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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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uint32_t start_insn, end_insn1, end_insn2, skip_insn;
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uint8_t *p;
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p = (void *)(p_end - 8);
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if (p <= p_start)
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error("empty code for %s", name);
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start_insn = get32((uint32_t *)(p_start + 0x0));
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end_insn1 = get32((uint32_t *)(p + 0x0));
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end_insn2 = get32((uint32_t *)(p + 0x4));
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if ((start_insn & ~0x1fff) == 0x9de3a000) {
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p_start += 0x4;
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start_offset += 0x4;
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if ((int)(start_insn | ~0x1fff) < -128)
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error("Found bogus save at the start of %s", name);
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if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
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error("ret; restore; not found at end of %s", name);
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} else {
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error("No save at the beginning of %s", name);
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}
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/* Skip a preceeding nop, if present. */
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if (p > p_start) {
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skip_insn = get32((uint32_t *)(p - 0x4));
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if (skip_insn == 0x01000000)
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p -= 4;
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}
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copy_size = p - p_start;
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}
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break;
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case EM_SPARCV9:
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{
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uint32_t start_insn, end_insn1, end_insn2, skip_insn;
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uint8_t *p;
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p = (void *)(p_end - 8);
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if (p <= p_start)
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error("empty code for %s", name);
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start_insn = get32((uint32_t *)(p_start + 0x0));
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end_insn1 = get32((uint32_t *)(p + 0x0));
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end_insn2 = get32((uint32_t *)(p + 0x4));
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if ((start_insn & ~0x1fff) == 0x9de3a000) {
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p_start += 0x4;
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start_offset += 0x4;
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if ((int)(start_insn | ~0x1fff) < -256)
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error("Found bogus save at the start of %s", name);
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if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
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error("ret; restore; not found at end of %s", name);
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} else {
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error("No save at the beginning of %s", name);
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}
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/* Skip a preceeding nop, if present. */
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if (p > p_start) {
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skip_insn = get32((uint32_t *)(p - 0x4));
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if (skip_insn == 0x01000000)
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p -= 4;
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}
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copy_size = p - p_start;
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}
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break;
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default:
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error("unknown ELF architecture");
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}
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/* compute the number of arguments by looking at the relocations */
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for(i = 0;i < MAX_ARGS; i++)
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args_present[i] = 0;
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for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
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if (rel->r_offset >= start_offset &&
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rel->r_offset < start_offset + copy_size) {
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sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
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if (strstart(sym_name, "__op_param", &p)) {
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n = strtoul(p, NULL, 10);
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if (n > MAX_ARGS)
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error("too many arguments in %s", name);
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args_present[n - 1] = 1;
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}
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}
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}
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nb_args = 0;
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while (nb_args < MAX_ARGS && args_present[nb_args])
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nb_args++;
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for(i = nb_args; i < MAX_ARGS; i++) {
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if (args_present[i])
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error("inconsistent argument numbering in %s", name);
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}
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if (gen_switch == 2) {
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fprintf(outfile, "DEF(%s, %d, %d)\n", name + 3, nb_args, copy_size);
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} else if (gen_switch == 1) {
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/* output C code */
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fprintf(outfile, "case INDEX_%s: {\n", name);
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if (nb_args > 0) {
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fprintf(outfile, " long ");
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for(i = 0; i < nb_args; i++) {
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if (i != 0)
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fprintf(outfile, ", ");
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fprintf(outfile, "param%d", i + 1);
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}
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fprintf(outfile, ";\n");
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}
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fprintf(outfile, " extern void %s();\n", name);
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for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
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if (rel->r_offset >= start_offset &&
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rel->r_offset < start_offset + copy_size) {
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sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
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if (*sym_name &&
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!strstart(sym_name, "__op_param", NULL) &&
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!strstart(sym_name, "__op_jmp", NULL)) {
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#if defined(HOST_SPARC)
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if (sym_name[0] == '.') {
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fprintf(outfile,
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"extern char __dot_%s __asm__(\"%s\");\n",
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sym_name+1, sym_name);
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continue;
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}
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#endif
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fprintf(outfile, "extern char %s;\n", sym_name);
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}
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}
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}
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fprintf(outfile, " memcpy(gen_code_ptr, (void *)((char *)&%s+%d), %d);\n", name, start_offset - offset, copy_size);
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|
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/* emit code offset information */
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{
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ElfW(Sym) *sym;
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const char *sym_name, *p;
|
|
target_ulong val;
|
|
int n;
|
|
|
|
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
|
|
sym_name = strtab + sym->st_name;
|
|
if (strstart(sym_name, "__op_label", &p)) {
|
|
uint8_t *ptr;
|
|
|
|
/* test if the variable refers to a label inside
|
|
the code we are generating */
|
|
if (sym->st_shndx == data_shndx)
|
|
ptr = data_data;
|
|
else if (sym->st_shndx == sdata_shndx)
|
|
ptr = sdata_data;
|
|
else
|
|
error("__op_labelN symbols must be in .data or .sdata section");
|
|
val = *(target_ulong *)(ptr + sym->st_value);
|
|
if (val >= start_offset && val < start_offset + copy_size) {
|
|
n = strtol(p, NULL, 10);
|
|
fprintf(outfile, " label_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n", n, val - start_offset);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* load parameres in variables */
|
|
for(i = 0; i < nb_args; i++) {
|
|
fprintf(outfile, " param%d = *opparam_ptr++;\n", i + 1);
|
|
}
|
|
|
|
/* patch relocations */
|
|
#if defined(HOST_I386)
|
|
{
|
|
char name[256];
|
|
int type;
|
|
int addend;
|
|
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
|
|
if (rel->r_offset >= start_offset &&
|
|
rel->r_offset < start_offset + copy_size) {
|
|
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
|
|
if (strstart(sym_name, "__op_param", &p)) {
|
|
snprintf(name, sizeof(name), "param%s", p);
|
|
} else {
|
|
snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
|
|
}
|
|
type = ELF32_R_TYPE(rel->r_info);
|
|
addend = get32((uint32_t *)(text + rel->r_offset));
|
|
switch(type) {
|
|
case R_386_32:
|
|
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
|
rel->r_offset - start_offset, name, addend);
|
|
break;
|
|
case R_386_PC32:
|
|
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
|
|
rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
|
|
break;
|
|
default:
|
|
error("unsupported i386 relocation (%d)", type);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#elif defined(HOST_PPC)
|
|
{
|
|
char name[256];
|
|
int type;
|
|
int addend;
|
|
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
|
|
if (rel->r_offset >= start_offset &&
|
|
rel->r_offset < start_offset + copy_size) {
|
|
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
|
|
if (strstart(sym_name, "__op_jmp", &p)) {
|
|
int n;
|
|
n = strtol(p, NULL, 10);
|
|
/* __op_jmp relocations are done at
|
|
runtime to do translated block
|
|
chaining: the offset of the instruction
|
|
needs to be stored */
|
|
fprintf(outfile, " jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
|
|
n, rel->r_offset - start_offset);
|
|
continue;
|
|
}
|
|
|
|
if (strstart(sym_name, "__op_param", &p)) {
|
|
snprintf(name, sizeof(name), "param%s", p);
|
|
} else {
|
|
snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
|
|
}
|
|
type = ELF32_R_TYPE(rel->r_info);
|
|
addend = rel->r_addend;
|
|
switch(type) {
|
|
case R_PPC_ADDR32:
|
|
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
|
rel->r_offset - start_offset, name, addend);
|
|
break;
|
|
case R_PPC_ADDR16_LO:
|
|
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
|
|
rel->r_offset - start_offset, name, addend);
|
|
break;
|
|
case R_PPC_ADDR16_HI:
|
|
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
|
|
rel->r_offset - start_offset, name, addend);
|
|
break;
|
|
case R_PPC_ADDR16_HA:
|
|
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
|
|
rel->r_offset - start_offset, name, addend);
|
|
break;
|
|
case R_PPC_REL24:
|
|
/* warning: must be at 32 MB distancy */
|
|
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
|
|
rel->r_offset - start_offset, rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
|
|
break;
|
|
default:
|
|
error("unsupported powerpc relocation (%d)", type);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#elif defined(HOST_S390)
|
|
{
|
|
char name[256];
|
|
int type;
|
|
int addend;
|
|
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
|
|
if (rel->r_offset >= start_offset &&
|
|
rel->r_offset < start_offset + copy_size) {
|
|
sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
|
|
if (strstart(sym_name, "__op_param", &p)) {
|
|
snprintf(name, sizeof(name), "param%s", p);
|
|
} else {
|
|
snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
|
|
}
|
|
type = ELF32_R_TYPE(rel->r_info);
|
|
addend = rel->r_addend;
|
|
switch(type) {
|
|
case R_390_32:
|
|
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
|
rel->r_offset - start_offset, name, addend);
|
|
break;
|
|
case R_390_16:
|
|
fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
|
rel->r_offset - start_offset, name, addend);
|
|
break;
|
|
case R_390_8:
|
|
fprintf(outfile, " *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
|
rel->r_offset - start_offset, name, addend);
|
|
break;
|
|
default:
|
|
error("unsupported s390 relocation (%d)", type);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#elif defined(HOST_ALPHA)
|
|
{
|
|
for (i = 0, rel = relocs; i < nb_relocs; i++, rel++) {
|
|
if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
|
|
int type;
|
|
|
|
type = ELF64_R_TYPE(rel->r_info);
|
|
sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
|
|
switch (type) {
|
|
case R_ALPHA_GPDISP:
|
|
/* The gp is just 32 bit, and never changes, so it's easiest to emit it
|
|
as an immediate instead of constructing it from the pv or ra. */
|
|
fprintf(outfile, " immediate_ldah(gen_code_ptr + %ld, gp);\n",
|
|
rel->r_offset - start_offset);
|
|
fprintf(outfile, " immediate_lda(gen_code_ptr + %ld, gp);\n",
|
|
rel->r_offset - start_offset + rel->r_addend);
|
|
break;
|
|
case R_ALPHA_LITUSE:
|
|
/* jsr to literal hint. Could be used to optimize to bsr. Ignore for
|
|
now, since some called functions (libc) need pv to be set up. */
|
|
break;
|
|
case R_ALPHA_HINT:
|
|
/* Branch target prediction hint. Ignore for now. Should be already
|
|
correct for in-function jumps. */
|
|
break;
|
|
case R_ALPHA_LITERAL:
|
|
/* Load a literal from the GOT relative to the gp. Since there's only a
|
|
single gp, nothing is to be done. */
|
|
break;
|
|
case R_ALPHA_GPRELHIGH:
|
|
/* Handle fake relocations against __op_param symbol. Need to emit the
|
|
high part of the immediate value instead. Other symbols need no
|
|
special treatment. */
|
|
if (strstart(sym_name, "__op_param", &p))
|
|
fprintf(outfile, " immediate_ldah(gen_code_ptr + %ld, param%s);\n",
|
|
rel->r_offset - start_offset, p);
|
|
break;
|
|
case R_ALPHA_GPRELLOW:
|
|
if (strstart(sym_name, "__op_param", &p))
|
|
fprintf(outfile, " immediate_lda(gen_code_ptr + %ld, param%s);\n",
|
|
rel->r_offset - start_offset, p);
|
|
break;
|
|
case R_ALPHA_BRSGP:
|
|
/* PC-relative jump. Tweak offset to skip the two instructions that try to
|
|
set up the gp from the pv. */
|
|
fprintf(outfile, " fix_bsr(gen_code_ptr + %ld, (uint8_t *) &%s - (gen_code_ptr + %ld) + 4);\n",
|
|
rel->r_offset - start_offset, sym_name, rel->r_offset - start_offset);
|
|
break;
|
|
default:
|
|
error("unsupported Alpha relocation (%d)", type);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#elif defined(HOST_IA64)
|
|
{
|
|
char name[256];
|
|
int type;
|
|
int addend;
|
|
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
|
|
if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
|
|
sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
|
|
if (strstart(sym_name, "__op_param", &p)) {
|
|
snprintf(name, sizeof(name), "param%s", p);
|
|
} else {
|
|
snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
|
|
}
|
|
type = ELF64_R_TYPE(rel->r_info);
|
|
addend = rel->r_addend;
|
|
switch(type) {
|
|
case R_IA64_LTOFF22:
|
|
error("must implemnt R_IA64_LTOFF22 relocation");
|
|
case R_IA64_PCREL21B:
|
|
error("must implemnt R_IA64_PCREL21B relocation");
|
|
default:
|
|
error("unsupported ia64 relocation (%d)", type);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#elif defined(HOST_SPARC)
|
|
{
|
|
char name[256];
|
|
int type;
|
|
int addend;
|
|
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
|
|
if (rel->r_offset >= start_offset &&
|
|
rel->r_offset < start_offset + copy_size) {
|
|
sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
|
|
if (strstart(sym_name, "__op_param", &p)) {
|
|
snprintf(name, sizeof(name), "param%s", p);
|
|
} else {
|
|
if (sym_name[0] == '.')
|
|
snprintf(name, sizeof(name),
|
|
"(long)(&__dot_%s)",
|
|
sym_name + 1);
|
|
else
|
|
snprintf(name, sizeof(name),
|
|
"(long)(&%s)", sym_name);
|
|
}
|
|
type = ELF32_R_TYPE(rel->r_info);
|
|
addend = rel->r_addend;
|
|
switch(type) {
|
|
case R_SPARC_32:
|
|
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
|
rel->r_offset - start_offset, name, addend);
|
|
break;
|
|
case R_SPARC_HI22:
|
|
fprintf(outfile,
|
|
" *(uint32_t *)(gen_code_ptr + %d) = "
|
|
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
|
" & ~0x3fffff) "
|
|
" | (((%s + %d) >> 10) & 0x3fffff);\n",
|
|
rel->r_offset - start_offset,
|
|
rel->r_offset - start_offset,
|
|
name, addend);
|
|
break;
|
|
case R_SPARC_LO10:
|
|
fprintf(outfile,
|
|
" *(uint32_t *)(gen_code_ptr + %d) = "
|
|
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
|
" & ~0x3ff) "
|
|
" | ((%s + %d) & 0x3ff);\n",
|
|
rel->r_offset - start_offset,
|
|
rel->r_offset - start_offset,
|
|
name, addend);
|
|
break;
|
|
case R_SPARC_WDISP30:
|
|
fprintf(outfile,
|
|
" *(uint32_t *)(gen_code_ptr + %d) = "
|
|
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
|
" & ~0x3fffffff) "
|
|
" | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
|
|
" & 0x3fffffff);\n",
|
|
rel->r_offset - start_offset,
|
|
rel->r_offset - start_offset,
|
|
name, addend,
|
|
rel->r_offset - start_offset);
|
|
break;
|
|
default:
|
|
error("unsupported sparc relocation (%d)", type);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#elif defined(HOST_SPARC64)
|
|
{
|
|
char name[256];
|
|
int type;
|
|
int addend;
|
|
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
|
|
if (rel->r_offset >= start_offset &&
|
|
rel->r_offset < start_offset + copy_size) {
|
|
sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
|
|
if (strstart(sym_name, "__op_param", &p)) {
|
|
snprintf(name, sizeof(name), "param%s", p);
|
|
} else {
|
|
snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
|
|
}
|
|
type = ELF64_R_TYPE(rel->r_info);
|
|
addend = rel->r_addend;
|
|
switch(type) {
|
|
case R_SPARC_32:
|
|
fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
|
|
rel->r_offset - start_offset, name, addend);
|
|
break;
|
|
case R_SPARC_HI22:
|
|
fprintf(outfile,
|
|
" *(uint32_t *)(gen_code_ptr + %d) = "
|
|
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
|
" & ~0x3fffff) "
|
|
" | (((%s + %d) >> 10) & 0x3fffff);\n",
|
|
rel->r_offset - start_offset,
|
|
rel->r_offset - start_offset,
|
|
name, addend);
|
|
break;
|
|
case R_SPARC_LO10:
|
|
fprintf(outfile,
|
|
" *(uint32_t *)(gen_code_ptr + %d) = "
|
|
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
|
" & ~0x3ff) "
|
|
" | ((%s + %d) & 0x3ff);\n",
|
|
rel->r_offset - start_offset,
|
|
rel->r_offset - start_offset,
|
|
name, addend);
|
|
break;
|
|
case R_SPARC_WDISP30:
|
|
fprintf(outfile,
|
|
" *(uint32_t *)(gen_code_ptr + %d) = "
|
|
"((*(uint32_t *)(gen_code_ptr + %d)) "
|
|
" & ~0x3fffffff) "
|
|
" | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
|
|
" & 0x3fffffff);\n",
|
|
rel->r_offset - start_offset,
|
|
rel->r_offset - start_offset,
|
|
name, addend,
|
|
rel->r_offset - start_offset);
|
|
break;
|
|
default:
|
|
error("unsupported sparc64 relocation (%d)", type);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#else
|
|
#error unsupported CPU
|
|
#endif
|
|
fprintf(outfile, " gen_code_ptr += %d;\n", copy_size);
|
|
fprintf(outfile, "}\n");
|
|
fprintf(outfile, "break;\n\n");
|
|
} else {
|
|
fprintf(outfile, "static inline void gen_%s(", name);
|
|
if (nb_args == 0) {
|
|
fprintf(outfile, "void");
|
|
} else {
|
|
for(i = 0; i < nb_args; i++) {
|
|
if (i != 0)
|
|
fprintf(outfile, ", ");
|
|
fprintf(outfile, "long param%d", i + 1);
|
|
}
|
|
}
|
|
fprintf(outfile, ")\n");
|
|
fprintf(outfile, "{\n");
|
|
for(i = 0; i < nb_args; i++) {
|
|
fprintf(outfile, " *gen_opparam_ptr++ = param%d;\n", i + 1);
|
|
}
|
|
fprintf(outfile, " *gen_opc_ptr++ = INDEX_%s;\n", name);
|
|
fprintf(outfile, "}\n\n");
|
|
}
|
|
}
|
|
|
|
/* load an elf object file */
|
|
int load_elf(const char *filename, FILE *outfile, int do_print_enum)
|
|
{
|
|
int fd;
|
|
struct elf_shdr *sec, *symtab_sec, *strtab_sec, *text_sec;
|
|
int i, j;
|
|
ElfW(Sym) *sym;
|
|
char *shstr;
|
|
uint8_t *text;
|
|
void *relocs;
|
|
int nb_relocs, reloc_sh_type;
|
|
|
|
fd = open(filename, O_RDONLY);
|
|
if (fd < 0)
|
|
error("can't open file '%s'", filename);
|
|
|
|
/* Read ELF header. */
|
|
if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
|
|
error("unable to read file header");
|
|
|
|
/* Check ELF identification. */
|
|
if (ehdr.e_ident[EI_MAG0] != ELFMAG0
|
|
|| ehdr.e_ident[EI_MAG1] != ELFMAG1
|
|
|| ehdr.e_ident[EI_MAG2] != ELFMAG2
|
|
|| ehdr.e_ident[EI_MAG3] != ELFMAG3
|
|
|| ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
|
|
error("bad ELF header");
|
|
}
|
|
|
|
do_swap = elf_must_swap(&ehdr);
|
|
if (do_swap)
|
|
elf_swap_ehdr(&ehdr);
|
|
if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
|
|
error("Unsupported ELF class");
|
|
if (ehdr.e_type != ET_REL)
|
|
error("ELF object file expected");
|
|
if (ehdr.e_version != EV_CURRENT)
|
|
error("Invalid ELF version");
|
|
if (!elf_check_arch(ehdr.e_machine))
|
|
error("Unsupported CPU (e_machine=%d)", ehdr.e_machine);
|
|
|
|
/* read section headers */
|
|
shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr));
|
|
if (do_swap) {
|
|
for(i = 0; i < ehdr.e_shnum; i++) {
|
|
elf_swap_shdr(&shdr[i]);
|
|
}
|
|
}
|
|
|
|
sec = &shdr[ehdr.e_shstrndx];
|
|
shstr = load_data(fd, sec->sh_offset, sec->sh_size);
|
|
|
|
/* text section */
|
|
|
|
text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
|
|
if (!text_sec)
|
|
error("could not find .text section");
|
|
text = load_data(fd, text_sec->sh_offset, text_sec->sh_size);
|
|
|
|
data_shndx = -1;
|
|
sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".data");
|
|
if (sec) {
|
|
data_shndx = sec - shdr;
|
|
data_data = load_data(fd, sec->sh_offset, sec->sh_size);
|
|
}
|
|
sdata_shndx = -1;
|
|
sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".sdata");
|
|
if (sec) {
|
|
sdata_shndx = sec - shdr;
|
|
sdata_data = load_data(fd, sec->sh_offset, sec->sh_size);
|
|
}
|
|
|
|
/* find text relocations, if any */
|
|
nb_relocs = 0;
|
|
relocs = NULL;
|
|
reloc_sh_type = 0;
|
|
for(i = 0; i < ehdr.e_shnum; i++) {
|
|
sec = &shdr[i];
|
|
if ((sec->sh_type == SHT_REL || sec->sh_type == SHT_RELA) &&
|
|
sec->sh_info == (text_sec - shdr)) {
|
|
reloc_sh_type = sec->sh_type;
|
|
relocs = load_data(fd, sec->sh_offset, sec->sh_size);
|
|
nb_relocs = sec->sh_size / sec->sh_entsize;
|
|
if (do_swap) {
|
|
if (sec->sh_type == SHT_REL) {
|
|
ElfW(Rel) *rel = relocs;
|
|
for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) {
|
|
swabls(&rel->r_offset);
|
|
swabls(&rel->r_info);
|
|
}
|
|
} else {
|
|
ElfW(Rela) *rel = relocs;
|
|
for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) {
|
|
swabls(&rel->r_offset);
|
|
swabls(&rel->r_info);
|
|
swabls(&rel->r_addend);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
|
|
if (!symtab_sec)
|
|
error("could not find .symtab section");
|
|
strtab_sec = &shdr[symtab_sec->sh_link];
|
|
|
|
symtab = load_data(fd, symtab_sec->sh_offset, symtab_sec->sh_size);
|
|
strtab = load_data(fd, strtab_sec->sh_offset, strtab_sec->sh_size);
|
|
|
|
nb_syms = symtab_sec->sh_size / sizeof(ElfW(Sym));
|
|
if (do_swap) {
|
|
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
|
|
swab32s(&sym->st_name);
|
|
swabls(&sym->st_value);
|
|
swabls(&sym->st_size);
|
|
swab16s(&sym->st_shndx);
|
|
}
|
|
}
|
|
|
|
if (do_print_enum) {
|
|
fprintf(outfile, "DEF(end, 0, 0)\n");
|
|
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
|
|
const char *name, *p;
|
|
name = strtab + sym->st_name;
|
|
if (strstart(name, OP_PREFIX, &p)) {
|
|
gen_code(name, sym->st_value, sym->st_size, outfile,
|
|
text, relocs, nb_relocs, reloc_sh_type, 2);
|
|
}
|
|
}
|
|
} else {
|
|
/* generate big code generation switch */
|
|
#ifdef HOST_ALPHA
|
|
fprintf(outfile,
|
|
"register int gp asm(\"$29\");\n"
|
|
"static inline void immediate_ldah(void *p, int val) {\n"
|
|
" uint32_t *dest = p;\n"
|
|
" long high = ((val >> 16) + ((val >> 15) & 1)) & 0xffff;\n"
|
|
"\n"
|
|
" *dest &= ~0xffff;\n"
|
|
" *dest |= high;\n"
|
|
" *dest |= 31 << 16;\n"
|
|
"}\n"
|
|
"static inline void immediate_lda(void *dest, int val) {\n"
|
|
" *(uint16_t *) dest = val;\n"
|
|
"}\n"
|
|
"void fix_bsr(void *p, int offset) {\n"
|
|
" uint32_t *dest = p;\n"
|
|
" *dest &= ~((1 << 21) - 1);\n"
|
|
" *dest |= (offset >> 2) & ((1 << 21) - 1);\n"
|
|
"}\n");
|
|
#endif
|
|
fprintf(outfile,
|
|
"int dyngen_code(uint8_t *gen_code_buf,\n"
|
|
" uint16_t *label_offsets, uint16_t *jmp_offsets,\n"
|
|
" const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
|
|
"{\n"
|
|
" uint8_t *gen_code_ptr;\n"
|
|
" const uint16_t *opc_ptr;\n"
|
|
" const uint32_t *opparam_ptr;\n"
|
|
" gen_code_ptr = gen_code_buf;\n"
|
|
" opc_ptr = opc_buf;\n"
|
|
" opparam_ptr = opparam_buf;\n");
|
|
|
|
/* Generate prologue, if needed. */
|
|
switch(ELF_ARCH) {
|
|
case EM_SPARC:
|
|
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x9c23a080; /* sub %%sp, 128, %%sp */\n");
|
|
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0xbc27a080; /* sub %%fp, 128, %%fp */\n");
|
|
break;
|
|
|
|
case EM_SPARCV9:
|
|
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x9c23a100; /* sub %%sp, 256, %%sp */\n");
|
|
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0xbc27a100; /* sub %%fp, 256, %%fp */\n");
|
|
break;
|
|
};
|
|
|
|
fprintf(outfile,
|
|
" for(;;) {\n"
|
|
" switch(*opc_ptr++) {\n"
|
|
);
|
|
|
|
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
|
|
const char *name;
|
|
name = strtab + sym->st_name;
|
|
if (strstart(name, OP_PREFIX, NULL)) {
|
|
#if 0
|
|
printf("%4d: %s pos=0x%08x len=%d\n",
|
|
i, name, sym->st_value, sym->st_size);
|
|
#endif
|
|
if (sym->st_shndx != (text_sec - shdr))
|
|
error("invalid section for opcode (0x%x)", sym->st_shndx);
|
|
gen_code(name, sym->st_value, sym->st_size, outfile,
|
|
text, relocs, nb_relocs, reloc_sh_type, 1);
|
|
}
|
|
}
|
|
|
|
fprintf(outfile,
|
|
" default:\n"
|
|
" goto the_end;\n"
|
|
" }\n"
|
|
" }\n"
|
|
" the_end:\n"
|
|
);
|
|
|
|
/* generate epilogue */
|
|
switch(ELF_ARCH) {
|
|
case EM_386:
|
|
fprintf(outfile, "*gen_code_ptr++ = 0xc3; /* ret */\n");
|
|
break;
|
|
case EM_PPC:
|
|
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
|
|
break;
|
|
case EM_S390:
|
|
fprintf(outfile, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n");
|
|
break;
|
|
case EM_ALPHA:
|
|
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x6bfa8001; /* ret */\n");
|
|
break;
|
|
case EM_IA_64:
|
|
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x00840008; /* br.ret.sptk.many b0;; */\n");
|
|
break;
|
|
case EM_SPARC:
|
|
case EM_SPARC32PLUS:
|
|
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0xbc07a080; /* add %%fp, 256, %%fp */\n");
|
|
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81c62008; /* jmpl %%i0 + 8, %%g0 */\n");
|
|
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x9c03a080; /* add %%sp, 256, %%sp */\n");
|
|
break;
|
|
case EM_SPARCV9:
|
|
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81c7e008; /* ret */\n");
|
|
fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81e80000; /* restore */\n");
|
|
break;
|
|
default:
|
|
error("unknown ELF architecture");
|
|
}
|
|
|
|
fprintf(outfile, "return gen_code_ptr - gen_code_buf;\n");
|
|
fprintf(outfile, "}\n\n");
|
|
|
|
/* generate gen_xxx functions */
|
|
/* XXX: suppress the use of these functions to simplify code */
|
|
for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
|
|
const char *name;
|
|
name = strtab + sym->st_name;
|
|
if (strstart(name, OP_PREFIX, NULL)) {
|
|
if (sym->st_shndx != (text_sec - shdr))
|
|
error("invalid section for opcode (0x%x)", sym->st_shndx);
|
|
gen_code(name, sym->st_value, sym->st_size, outfile,
|
|
text, relocs, nb_relocs, reloc_sh_type, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
void usage(void)
|
|
{
|
|
printf("dyngen (c) 2003 Fabrice Bellard\n"
|
|
"usage: dyngen [-o outfile] [-c] objfile\n"
|
|
"Generate a dynamic code generator from an object file\n"
|
|
"-c output enum of operations\n"
|
|
);
|
|
exit(1);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int c, do_print_enum;
|
|
const char *filename, *outfilename;
|
|
FILE *outfile;
|
|
|
|
outfilename = "out.c";
|
|
do_print_enum = 0;
|
|
for(;;) {
|
|
c = getopt(argc, argv, "ho:c");
|
|
if (c == -1)
|
|
break;
|
|
switch(c) {
|
|
case 'h':
|
|
usage();
|
|
break;
|
|
case 'o':
|
|
outfilename = optarg;
|
|
break;
|
|
case 'c':
|
|
do_print_enum = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (optind >= argc)
|
|
usage();
|
|
filename = argv[optind];
|
|
outfile = fopen(outfilename, "w");
|
|
if (!outfile)
|
|
error("could not open '%s'", outfilename);
|
|
load_elf(filename, outfile, do_print_enum);
|
|
fclose(outfile);
|
|
return 0;
|
|
}
|