205 lines
8.1 KiB
C
205 lines
8.1 KiB
C
/****************************************************************************
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* include/nxflat.h
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NXFLAT_H
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#define __INCLUDE_NXFLAT_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdint.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define NXFLAT_MAX_STRING_SIZE 64 /* Largest size of string (w/zterminator) */
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#define NXFLAT_MAGIC "NxFT" /* NXFLAT magic number */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* The NXFLAT file header
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*
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* The elements within this structure are stored in network order (i.e.,
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* ntohs() and ntohl() should be used to access fields within the
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* header.
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****************************************************************************/
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struct nxflat_hdr_s
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{
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/* The "magic number" identifying the file type. This field should contain
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* "NxFT". NOTE that there is no other versioning information other than
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* this magic number.
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*/
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char h_magic[4];
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/* The following fields provide the memory map for the nxflat binary.
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*
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* h_entry - Offset to the first executable insruction from
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* the beginning of the file.
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* h_datastart - Offset to the beginning of the data segment from
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* the beginning of the file. This field can also
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* interpreted as the size of the ISpace segment.
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* h_dataend - Offset to the end of the data segment from the
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* beginning of the file.
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* h_bssend - Offset to the end of bss segment from the beginning
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* of the file.
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*
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* The text segment can be considered to be the contiguous (unrelocated)
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* address space range from address zero through (but not including)
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* h_datastart.
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*
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* The size of the data/bss segment includes (as a minimum) the data
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* and bss regions (bss_end - data_start) as well as the size of the
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* stack. At run time, this region will also include program arguments
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* and environement variables.
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*
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* The bss segment is data_end through bss_end.
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*/
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uint32_t h_entry;
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uint32_t h_datastart;
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uint32_t h_dataend;
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uint32_t h_bssend;
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/* Size of stack, in bytes */
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uint32_t h_stacksize;
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/* Relocation entries:
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*
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* h_relocstart - Offset to the beginning of an array of relocation
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* records (struct nxflat_reloc). The offset is
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* relative to the start of the file
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*/
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uint32_t h_relocstart; /* Offset of relocation records */
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/* Imported symbol table (NOTE no symbols are exported):
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*
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* h_importsymbols - Offset to the beginning of an array of imported
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* symbol structures (struct nxflat_import_s). The
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* h_importsymbols offset is relative to the
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* beginning of the file. Each entry of the
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* array contains an uint32_t offset (again from
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* the beginning of the file) to the name of
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* a symbol string. This string is null-terminated.
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*/
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uint32_t h_importsymbols; /* Offset to list of imported symbols */
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/* 16-bit counts
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*
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* h_reloccount - The number of relocation records in the arry
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* h_importcount - The number of records in the h_importsymbols array.
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*/
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uint16_t h_reloccount; /* Number of relocation records */
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uint16_t h_importcount; /* Number of imported symbols */
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};
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/****************************************************************************
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* NXFLAT Relocation types.
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*
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* The relocation records are an array of the following type.
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****************************************************************************/
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struct nxflat_reloc_s
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{
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uint32_t r_info; /* Bit-encoded relocation info */
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};
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/* Pack the type and the offset into one 32-bit value */
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#define NXFLAT_RELOC(t,o) (((uint32_t)((t) & 3) << 30) | ((o) & 0x3fffffff))
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/* The top three bits of the relocation info is the relocation type (see the
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* NXFLAT_RELOC_TYPE_* definitions below. This is an unsigned value.
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*/
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#define NXFLAT_RELOC_TYPE(r) ((uint32_t)(r) >> 30)
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/* The bottom 28 bits of the relocation info is the (non-negative) offset into
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* the D-Space that needs the fixup.
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*/
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#define NXFLAT_RELOC_OFFSET(r) ((uint32_t)(r) & 0x3fffffff)
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/* These are possible values for the relocation type:
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*
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* NXFLAT_RELOC_TYPE_REL32I Meaning: Object file contains a 32-bit offset
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* into I-Space at the offset.
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* Fixup: Add mapped I-Space address to the offset.
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* NXFLAT_RELOC_TYPE_REL32D Meaning: Object file contains a 32-bit offset
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* into D-Space at the offset.
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* Fixup: Add allocated D-Space address to the
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* offset.
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* NXFLAT_RELOC_TYPE_REL32ID Meaning: Object file contains a 32-bit offset
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* into I-Space at the offset that will
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* unfortunately be references relative
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* to the GOT
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* Fixup: Add allocated the mapped I-Space
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* address MINUS the allocated D-Space
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* address to the offset.
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*/
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#define NXFLAT_RELOC_TYPE_REL32I 0
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#define NXFLAT_RELOC_TYPE_REL32D 1
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#undef NXFLAT_RELOC_TYPE_REL32ID /* May not need */
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#define NXFLAT_RELOC_TYPE_NUM 2 /* Number of relocation types */
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/****************************************************************************
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* NXFLAT Imported symbol type
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*
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* The imported symbols are an array of the following type. The fields
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* in each element are stored in native machine order.
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****************************************************************************/
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struct nxflat_import_s
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{
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uint32_t i_funcname; /* Offset to name of imported function */
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uint32_t i_funcaddress; /* Resolved address of imported function */
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};
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#endif /* __INCLUDE_NXFLAT_H */
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