d85631c4ac
stolen from the ia64/ia32 code (indeed there was a repocopy), but I've redone the MD parts and added and fixed a few essential syscalls. It is sufficient to run i386 binaries like /bin/ls, /usr/bin/id (dynamic) and p4. The ia64 code has not implemented signal delivery, so I had to do that. Before you say it, yes, this does need to go in a common place. But we're in a freeze at the moment and I didn't want to risk breaking ia64. I will sort this out after the freeze so that the common code is in a common place. On the AMD64 side, this required adding segment selector context switch support and some other support infrastructure. The %fs/%gs etc code is hairy because loading %gs will clobber the kernel's current MSR_GSBASE setting. The segment selectors are not used by the kernel, so they're only changed at context switch time or when changing modes. This still needs to be optimized. Approved by: re (amd64/* blanket)
153 lines
5.5 KiB
C
153 lines
5.5 KiB
C
/*-
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* Copyright (c) 1996-1997 John D. Polstra.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_ELF_H_
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#define _MACHINE_ELF_H_ 1
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/*
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* ELF definitions for the AMD64 architecture.
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*/
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#ifndef __ELF_WORD_SIZE
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#define __ELF_WORD_SIZE 64 /* Used by <sys/elf_generic.h> */
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#endif
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#include <sys/elf32.h> /* Definitions common to all 32 bit architectures. */
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#include <sys/elf64.h> /* Definitions common to all 64 bit architectures. */
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#include <sys/elf_generic.h>
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#define ELF_ARCH EM_X86_64
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#define ELF_MACHINE_OK(x) ((x) == EM_X86_64)
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/*
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* Auxiliary vector entries for passing information to the interpreter.
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*
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* The i386 supplement to the SVR4 ABI specification names this "auxv_t",
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* but POSIX lays claim to all symbols ending with "_t".
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*/
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typedef struct { /* Auxiliary vector entry on initial stack */
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int a_type; /* Entry type. */
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union {
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int a_val; /* Integer value. */
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} a_un;
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} Elf32_Auxinfo;
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typedef struct { /* Auxiliary vector entry on initial stack */
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long a_type; /* Entry type. */
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union {
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long a_val; /* Integer value. */
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void *a_ptr; /* Address. */
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void (*a_fcn)(void); /* Function pointer (not used). */
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} a_un;
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} Elf64_Auxinfo;
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__ElfType(Auxinfo);
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/* Values for a_type. */
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#define AT_NULL 0 /* Terminates the vector. */
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#define AT_IGNORE 1 /* Ignored entry. */
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#define AT_EXECFD 2 /* File descriptor of program to load. */
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#define AT_PHDR 3 /* Program header of program already loaded. */
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#define AT_PHENT 4 /* Size of each program header entry. */
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#define AT_PHNUM 5 /* Number of program header entries. */
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#define AT_PAGESZ 6 /* Page size in bytes. */
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#define AT_BASE 7 /* Interpreter's base address. */
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#define AT_FLAGS 8 /* Flags (unused for i386). */
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#define AT_ENTRY 9 /* Where interpreter should transfer control. */
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/*
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* The following non-standard values are used for passing information
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* from John Polstra's testbed program to the dynamic linker. These
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* are expected to go away soon.
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*
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* Unfortunately, these overlap the Linux non-standard values, so they
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* must not be used in the same context.
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*/
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#define AT_BRK 10 /* Starting point for sbrk and brk. */
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#define AT_DEBUG 11 /* Debugging level. */
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/*
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* The following non-standard values are used in Linux ELF binaries.
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*/
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#define AT_NOTELF 10 /* Program is not ELF ?? */
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#define AT_UID 11 /* Real uid. */
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#define AT_EUID 12 /* Effective uid. */
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#define AT_GID 13 /* Real gid. */
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#define AT_EGID 14 /* Effective gid. */
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#define AT_COUNT 15 /* Count of defined aux entry types. */
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/*
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* Relocation types.
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*/
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#define R_X86_64_NONE 0 /* No relocation. */
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#define R_X86_64_64 1 /* Add 64 bit symbol value. */
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#define R_X86_64_PC32 2 /* PC-relative 32 bit signed sym value. */
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#define R_X86_64_GOT32 3 /* PC-relative 32 bit GOT offset. */
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#define R_X86_64_PLT32 4 /* PC-relative 32 bit PLT offset. */
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#define R_X86_64_COPY 5 /* Copy data from shared object. */
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#define R_X86_64_GLOB_DAT 6 /* Set GOT entry to data address. */
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#define R_X86_64_JMP_SLOT 7 /* Set GOT entry to code address. */
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#define R_X86_64_RELATIVE 8 /* Add load address of shared object. */
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#define R_X86_64_GOTPCREL 9 /* Add 32 bit signed pcrel offset to GOT. */
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#define R_X86_64_32 10 /* Add 32 bit zero extended symbol value */
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#define R_X86_64_32S 11 /* Add 32 bit sign extended symbol value */
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#define R_X86_64_16 12 /* Add 16 bit zero extended symbol value */
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#define R_X86_64_PC16 13 /* Add 16 bit signed extended pc relative symbol value */
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#define R_X86_64_8 14 /* Add 8 bit zero extended symbol value */
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#define R_X86_64_PC8 15 /* Add 8 bit signed extended pc relative symbol value */
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#define R_X86_64_COUNT 16 /* Count of defined relocation types. */
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/* Define "machine" characteristics */
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#if __ELF_WORD_SIZE == 32
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#define ELF_TARG_CLASS ELFCLASS32
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#else
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#define ELF_TARG_CLASS ELFCLASS64
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#endif
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#define ELF_TARG_DATA ELFDATA2LSB
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#define ELF_TARG_MACH EM_X86_64
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#define ELF_TARG_VER 1
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#ifdef _KERNEL
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/*
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* On the i386 we load the dynamic linker where a userland call
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* to mmap(0, ...) would put it. The rationale behind this
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* calculation is that it leaves room for the heap to grow to
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* its maximum allowed size.
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*/
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#define ELF_RTLD_ADDR(vmspace) \
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(round_page((vm_offset_t)(vmspace)->vm_daddr + maxdsiz))
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#endif /* _KERNEL */
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#endif /* !_MACHINE_ELF_H_ */
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