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