added elf32 header for ds

svn-id: r50586

1 files changed, 192 insertions, 0 deletions

diff --git a/backends/platform/ds/elf32.h b/backends/platform/ds/elf32.h
new file mode 100644
index 0000000000..2b695c917d
--- /dev/null
+++ b/backends/platform/ds/elf32.h
@@ -0,0 +1,192 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifndef BACKENDS_ELF_H
+#define BACKENDS_ELF_H
+
+/* ELF stuff */
+
+typedef unsigned short Elf32_Half, Elf32_Section;
+typedef unsigned int Elf32_Word, Elf32_Addr, Elf32_Off;
+typedef signed int  Elf32_Sword;
+typedef Elf32_Half Elf32_Versym;
+
+#define EI_NIDENT (16)
+#define SELFMAG         6
+
+/* ELF File format structures. Look up ELF structure for more details */
+
+// ELF header (contains info about the file)
+typedef struct {
+	unsigned char e_ident[EI_NIDENT];     /* Magic number and other info */
+	Elf32_Half    e_type;                 /* Object file type */
+	Elf32_Half    e_machine;              /* Architecture */
+	Elf32_Word    e_version;              /* Object file version */
+	Elf32_Addr    e_entry;                /* Entry point virtual address */
+	Elf32_Off     e_phoff;                /* Program header table file offset */
+	Elf32_Off     e_shoff;                /* Section header table file offset */
+	Elf32_Word    e_flags;                /* Processor-specific flags */
+	Elf32_Half    e_ehsize;               /* ELF header size in bytes */
+	Elf32_Half    e_phentsize;            /* Program header table entry size */
+	Elf32_Half    e_phnum;                /* Program header table entry count */
+	Elf32_Half    e_shentsize;            /* Section header table entry size */
+	Elf32_Half    e_shnum;                /* Section header table entry count */
+	Elf32_Half    e_shstrndx;             /* Section header string table index */
+} Elf32_Ehdr;
+
+// Should be in e_ident
+#define ELFMAG          "\177ELF\1\1"	/* ELF Magic number */
+
+// e_type values
+#define ET_NONE		0	/* no file type */
+#define ET_REL		1	/* relocatable */
+#define ET_EXEC		2	/* executable */
+#define ET_DYN		3	/* shared object */
+#define ET_CORE		4	/* core file */
+
+// e_machine values
+#define EM_ARM		40
+
+// Program header (contains info about segment)
+typedef struct {
+	Elf32_Word    p_type;                 /* Segment type */
+	Elf32_Off     p_offset;               /* Segment file offset */
+	Elf32_Addr    p_vaddr;                /* Segment virtual address */
+	Elf32_Addr    p_paddr;                /* Segment physical address */
+	Elf32_Word    p_filesz;               /* Segment size in file */
+	Elf32_Word    p_memsz;                /* Segment size in memory */
+	Elf32_Word    p_flags;                /* Segment flags */
+	Elf32_Word    p_align;                /* Segment alignment */
+} Elf32_Phdr;
+
+// p_type values
+#define PT_NULL 		0	/* ignored */
+#define PT_LOAD			1	/* loadable segment */
+#define PT_DYNAMIC		2	/* dynamic linking info */
+#define PT_INTERP		3	/* info about interpreter */
+#define PT_NOTE			4	/* note segment */
+#define PT_SHLIB		5	/* reserved */
+#define PT_PHDR			6	/* Program header table */
+#define PT_ARM_ARCHEXT 	0x70000000 /* Platform architecture compatibility information */
+#define PT_ARM_EXIDX 	0x70000001 /* Exception unwind tables */
+
+// p_flags value
+#define PF_X	1	/* execute */
+#define PF_W	2	/* write */
+#define PF_R	4	/* read */
+
+// Section header (contains info about section)
+typedef struct {
+	Elf32_Word    sh_name;                /* Section name (string tbl index) */
+	Elf32_Word    sh_type;                /* Section type */
+	Elf32_Word    sh_flags;               /* Section flags */
+	Elf32_Addr    sh_addr;                /* Section virtual addr at execution */
+	Elf32_Off     sh_offset;              /* Section file offset */
+	Elf32_Word    sh_size;                /* Section size in bytes */
+	Elf32_Word    sh_link;                /* Link to another section */
+	Elf32_Word    sh_info;                /* Additional section information */
+	Elf32_Word    sh_addralign;           /* Section alignment */
+	Elf32_Word    sh_entsize;             /* Entry size if section holds table */
+} Elf32_Shdr;
+
+// sh_type values
+#define SHT_NULL			0	/* Inactive section */
+#define SHT_PROGBITS                    1	/* Proprietary */
+#define SHT_SYMTAB			2	/* Symbol table */
+#define SHT_STRTAB			3	/* String table */
+#define SHT_RELA			4	/* Relocation entries with addend */
+#define SHT_HASH			5	/* Symbol hash table */
+#define SHT_DYNAMIC			6	/* Info for dynamic linking */
+#define SHT_NOTE			7	/* Note section */
+#define SHT_NOBITS			8	/* Occupies no space */
+#define SHT_REL				9	/* Relocation entries without addend */
+#define SHT_SHLIB			10	/* Reserved */
+#define SHT_DYNSYM			11	/* Minimal set of dynamic linking symbols */
+#define SHT_ARM_EXIDX 		0x70000001	/* Exception Index table */
+#define SHT_ARM_PREEMPTMAP 	0x70000002	/* BPABI DLL dynamic linking pre-emption map */
+#define SHT_ARM_ATTRIBUTES 	0x70000003	/* Object file compatibility attributes */
+
+// sh_flags values
+#define SHF_WRITE		0	/* writable section */
+#define SHF_ALLOC		2	/* section occupies memory */
+#define SHF_EXECINSTR	        4	/* machine instructions */
+
+// Symbol entry (contain info about a symbol)
+typedef struct {
+	Elf32_Word    st_name;                /* Symbol name (string tbl index) */
+	Elf32_Addr    st_value;               /* Symbol value */
+	Elf32_Word    st_size;                /* Symbol size */
+	unsigned char st_info;                /* Symbol type and binding */
+	unsigned char st_other;               /* Symbol visibility */
+	Elf32_Section st_shndx;               /* Section index */
+} Elf32_Sym;
+
+// Extract from the st_info
+#define SYM_TYPE(x)		((x)&0xF)
+#define SYM_BIND(x)		((x)>>4)
+
+// Symbol binding values from st_info
+#define STB_LOCAL 	0	/* Symbol not visible outside object */
+#define STB_GLOBAL 	1	/* Symbol visible to all object files */
+#define STB_WEAK	2	/* Similar to STB_GLOBAL */
+
+// Symbol type values from st_info
+#define STT_NOTYPE	0	/* Not specified */
+#define STT_OBJECT	1	/* Data object e.g. variable */
+#define STT_FUNC	2	/* Function */
+#define STT_SECTION	3	/* Section */
+#define STT_FILE	4	/* Source file associated with object file */
+
+// Special section header index values from st_shndex
+#define SHN_UNDEF  		0
+#define SHN_LOPROC 		0xFF00	/* Extended values */
+#define SHN_ABS	   		0xFFF1	/* Absolute value: don't relocate */
+#define SHN_COMMON 		0xFFF2	/* Common block. Not allocated yet */
+#define SHN_HIPROC 		0xFF1F
+#define SHN_HIRESERVE 	        0xFFFF
+
+// Relocation entry (info about how to relocate)
+typedef struct {
+	Elf32_Addr    r_offset;               /* Address */
+	Elf32_Word    r_info;                 /* Relocation type and symbol index */
+	Elf32_Sword   r_addend;               /* Addend */
+} Elf32_Rela;
+
+// Access macros for the relocation info
+#define REL_TYPE(x)	((unsigned char) (x))	/* Extract relocation type */
+#define REL_INDEX(x)	((x)>>8)		/* Extract relocation index into symbol table */
+
+// ARM relocation types
+#define R_ARM_NONE			0
+#define R_ARM_PC24			1
+#define R_ARM_ABS32			2
+#define R_ARM_COPY			20
+#define R_ARM_GLOB_DAT			21
+#define R_ARM_JUMP_SLOT			22
+#define R_ARM_BASE_PREL			25
+#define R_ARM_GOT_BREL			26
+#define R_ARM_PLT32			27
+
+#endif /* BACKENDS_ELF_H */