| /**************************************************************************** |
| * include/nxflat.h |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. The |
| * ASF licenses this file to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance with the |
| * License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations |
| * under the License. |
| * |
| ****************************************************************************/ |
| |
| #ifndef __INCLUDE_NXFLAT_H |
| #define __INCLUDE_NXFLAT_H |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <nuttx/config.h> |
| |
| #include <sys/types.h> |
| #include <stdint.h> |
| |
| /**************************************************************************** |
| * 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 */ |
