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      1 /* elf-fdpic.h: FDPIC ELF load map
      2  *
      3  * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
      4  * Written by David Howells (dhowells (at) redhat.com)
      5  *
      6  * This program is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU General Public License
      8  * as published by the Free Software Foundation; either version
      9  * 2 of the License, or (at your option) any later version.
     10  */
     11 
     12 #ifndef _LINUX_ELF_FDPIC_H
     13 #define _LINUX_ELF_FDPIC_H
     14 
     15 #include <linux/elf.h>
     16 
     17 #define PT_GNU_STACK    (PT_LOOS + 0x474e551)
     18 
     19 /* segment mappings for ELF FDPIC libraries/executables/interpreters */
     20 struct elf32_fdpic_loadseg {
     21 	Elf32_Addr	addr;		/* core address to which mapped */
     22 	Elf32_Addr	p_vaddr;	/* VMA recorded in file */
     23 	Elf32_Word	p_memsz;	/* allocation size recorded in file */
     24 };
     25 
     26 struct elf32_fdpic_loadmap {
     27 	Elf32_Half	version;	/* version of these structures, just in case... */
     28 	Elf32_Half	nsegs;		/* number of segments */
     29 	struct elf32_fdpic_loadseg segs[];
     30 };
     31 
     32 #define ELF32_FDPIC_LOADMAP_VERSION	0x0000
     33 
     34 /*
     35  * binfmt binary parameters structure
     36  */
     37 struct elf_fdpic_params {
     38 	struct elfhdr			hdr;		/* ref copy of ELF header */
     39 	struct elf_phdr			*phdrs;		/* ref copy of PT_PHDR table */
     40 	struct elf32_fdpic_loadmap	*loadmap;	/* loadmap to be passed to userspace */
     41 	unsigned long			elfhdr_addr;	/* mapped ELF header user address */
     42 	unsigned long			ph_addr;	/* mapped PT_PHDR user address */
     43 	unsigned long			map_addr;	/* mapped loadmap user address */
     44 	unsigned long			entry_addr;	/* mapped entry user address */
     45 	unsigned long			stack_size;	/* stack size requested (PT_GNU_STACK) */
     46 	unsigned long			dynamic_addr;	/* mapped PT_DYNAMIC user address */
     47 	unsigned long			load_addr;	/* user address at which to map binary */
     48 	unsigned long			flags;
     49 #define ELF_FDPIC_FLAG_ARRANGEMENT	0x0000000f	/* PT_LOAD arrangement flags */
     50 #define ELF_FDPIC_FLAG_INDEPENDENT	0x00000000	/* PT_LOADs can be put anywhere */
     51 #define ELF_FDPIC_FLAG_HONOURVADDR	0x00000001	/* PT_LOAD.vaddr must be honoured */
     52 #define ELF_FDPIC_FLAG_CONSTDISP	0x00000002	/* PT_LOADs require constant
     53 							 * displacement */
     54 #define ELF_FDPIC_FLAG_CONTIGUOUS	0x00000003	/* PT_LOADs should be contiguous */
     55 #define ELF_FDPIC_FLAG_EXEC_STACK	0x00000010	/* T if stack to be executable */
     56 #define ELF_FDPIC_FLAG_NOEXEC_STACK	0x00000020	/* T if stack not to be executable */
     57 #define ELF_FDPIC_FLAG_EXECUTABLE	0x00000040	/* T if this object is the executable */
     58 #define ELF_FDPIC_FLAG_PRESENT		0x80000000	/* T if this object is present */
     59 };
     60 
     61 #ifdef CONFIG_MMU
     62 extern void elf_fdpic_arch_lay_out_mm(struct elf_fdpic_params *exec_params,
     63 				      struct elf_fdpic_params *interp_params,
     64 				      unsigned long *start_stack,
     65 				      unsigned long *start_brk);
     66 #endif
     67 
     68 #endif /* _LINUX_ELF_FDPIC_H */
     69