Mon Feb 27 07:00:57 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>

	* elf/libelf.h: New file.
	* elf/elf_hash.c: New file.

1 files changed, 278 insertions, 0 deletions

diff --git a/elf/libelf.h b/elf/libelf.h
new file mode 100644
index 0000000000..e7119e98b5
--- /dev/null
+++ b/elf/libelf.h
@@ -0,0 +1,278 @@
+/* Interface for manipulating ELF object files; functions found in -lelf.
+Copyright (C) 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#ifndef _LIBELF_H
+#define	_LIBELF_H 1
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <elf.h>
+
+__BEGIN_DECLS
+
+/* Commands to operate on an Elf descriptor.
+   The meanings are slightly different for the different functions.  */
+typedef enum 
+{
+  ELF_C_NULL = 0,
+  ELF_C_READ,			/* Read from the file.  */
+  ELF_C_WRITE,			/* Write the file, ignoring old contents.  */
+  ELF_C_CLR,			/* Clear specified flag bits.  */
+  ELF_C_SET,			/* Set specified flag bits.  */
+  ELF_C_FDDONE,			/* Close the fd; no further io will happen.  */
+  ELF_C_FDREAD,			/* Read the whole file, then close it.  */
+  ELF_C_RDWR,			/* Read from and modify the file.  */
+  ELF_C_NUM			/* Number of valid command values.  */
+} Elf_Cmd;
+
+
+/* Flag bits for `elf_flag*'.  */
+#define	ELF_F_DIRTY	0x1	/* Object is  */
+#define	ELF_F_LAYOUT	0x4
+
+
+/* File types.  */
+typedef enum
+{
+  ELF_K_NONE = 0,
+  ELF_K_AR,
+  ELF_K_COFF,			/* The GNU -lelf does not support COFF.  */
+  ELF_K_ELF,
+  ELF_K_NUM			/* Number of valid file kinds.  */
+} Elf_Kind;
+
+
+/* Translation types.  */
+typedef enum
+{
+  ELF_T_BYTE = 0,
+  ELF_T_ADDR,
+  ELF_T_DYN,
+  ELF_T_EHDR,
+  ELF_T_HALF,
+  ELF_T_OFF,
+  ELF_T_PHDR,
+  ELF_T_RELA,
+  ELF_T_REL,
+  ELF_T_SHDR,
+  ELF_T_SWORD,
+  ELF_T_SYM,
+  ELF_T_WORD,
+  ELF_T_NUM
+} Elf_Type;
+
+
+/* These types are opaque to user code; only pointers to them are used.  */
+typedef struct Elf Elf;
+typedef struct Elf_Scn Elf_Scn;
+
+
+/* Archive member header.  */
+typedef struct
+{
+  char *ar_name;
+  time_t ar_date;
+  uid_t ar_uid;
+  gid_t ar_gid;
+  mode_t ar_mode;
+  off_t ar_size;
+  char *ar_rawname;
+} Elf_Arhdr;
+
+/* Archive symbol table.  */
+typedef struct
+{
+  char *as_name;
+  size_t as_off;
+  unsigned long int as_hash;
+} Elf_Arsym;
+
+
+/* Data descriptor.  */
+typedef struct
+{
+  Elf_Void *d_buf;
+  Elf_Type d_type;
+  size_t d_size;
+  off_t d_off;			/* Offset into section.  */
+  size_t d_align;		/* Alignment in section.  */
+  unsigned int d_version;	/* ELF version.  */
+} Elf_Data;
+
+
+
+/* Open an Elf descriptor on file descriptor FD.
+   REF is the Elf descriptor for the containing archive (to open a member);
+   or the descriptor previously returned for FD (to add a user reference);
+   or NULL.  */
+extern Elf *elf_begin __P ((int __fd, Elf_Cmd __cmd, Elf *__ref));
+
+/* Finish using ELF (remove a user reference); if this is the last user
+   reference, its data will be freed.  */
+extern int elf_end __P ((Elf *__elf));
+
+/* Control the library's access to the file descriptor for ELF.
+   CMD is either ELF_C_FDDONE or ELF_C_FDREAD.  */
+extern int elf_cntl __P ((Elf *__elf, Elf_Cmd __cmd));
+
+
+/* Return a string describing an ELF error number.  */
+extern __const char *elf_errmsg	__P ((int __errno));
+
+/* Return the ELF error number for the last failed operation.  */
+extern int elf_errno __P ((void));
+
+/* Set the byte value used to fill sections for alignment.  */
+extern void elf_fill __P ((int __fillchar));
+
+/* The following functions `elf_flag*' all operate the same way:
+   CMD is either ELF_C_SET or ELF_C_CLR; FLAGS are `ELF_F_*' above,
+   which are set or cleared for the object the call relates to.  */
+
+/* Modify flags affecting the file as a whole (?).  */
+extern unsigned	int elf_flagelf __P ((Elf *__elf, Elf_Cmd __cmd,
+				      unsigned int __flags));
+/* Modify flags affecting DATA.  */
+extern unsigned int elf_flagdata __P ((Elf_Data *__data, Elf_Cmd __cmd,
+				       unsigned int __flags));
+/* Modify flags affecting the ELF header.  */
+extern unsigned	int elf_flagehdr __P ((Elf *__elf, Elf_Cmd __cmd,
+				       unsigned int __flags));
+/* Modify flags affecting the ELF program header.  */
+extern unsigned	int elf_flagphdr __P ((Elf *__elf, Elf_Cmd, __cmd
+				       unsigned int __flags));
+/* Modify flags affecting the given section's data.  */
+extern unsigned	int elf_flagscn __P ((Elf_Scn *__scn, Elf_Cmd __cmd,
+				      unsigned int __flags));
+/* Modify flags affecting the given section's header.  */
+extern unsigned	int elf_flagshdr __P ((Elf_Scn *__scn, Elf_Cmd __cmd,
+				       unsigned int __flags));
+
+
+extern size_t elf32_fsize __P ((Elf_Type __type, size_t __count,
+				unsigned int __ver));
+
+/* Return the archive header for ELF, which must describe an archive.  */
+extern Elf_Arhdr *elf_getarhdr __P ((Elf *__elf));
+
+/* Return the archive symbol table for ELF, and store
+   in *NELTSP the number of elements in the table.  */
+extern Elf_Arsym *elf_getarsym __P ((Elf *__elf, size_t *__neltsp));
+
+/* Return the file offset for the beginning of ELF.
+   If ELF describes an archive member, this points to the member header.  */
+extern off_t elf_getbase __P ((Elf *__elf));
+
+/* Extract the data from a section.  */
+extern Elf_Data *elf_getdata __P ((Elf_Scn *__scn, Elf_Data *__data));
+
+/* Extract the ELF header from the file.  */
+extern Elf32_Ehdr *elf32_getehdr __P ((Elf *__elf));
+
+/* Extract the initial ELF identification bytes from the file.
+   If PTR is nonnull, the number of identification bytes is stored there.  */
+extern char *elf_getident __P((Elf *__elf, size_t *__ptr));
+
+/* Extract the ELF program header from the file.  */
+extern Elf32_Phdr *elf32_getphdr __P ((Elf *__elf));
+
+/* Extract the indicated section from the file.  */
+extern Elf_Scn *elf_getscn __P ((Elf *__elf, size_t __index));
+
+/* Extract the section header from the section.  */
+extern Elf32_Shdr *elf32_getshdr __P ((Elf_Scn *__scn));
+
+/* Return the index of the section following SCN.  */
+extern size_t elf_ndxscn __P ((Elf_Scn *__scn));
+
+
+/* Standard ELF symbol name hash function.  */
+extern unsigned long int elf_hash __P ((__const char *__name));
+
+#if defined (__OPTIMIZE__) || defined (_EXTERN_INLINE)
+#ifndef _EXTERN_INLINE
+#define _EXTERN_INLINE extern __inline
+#endif
+_EXTERN_INLINE unsigned long int
+elf_hash (__const char *__name)
+{
+  /* This is the hashing function specified by the ELF ABI.  */
+  unsigned long int __hash = 0;
+  while (*__name != '\0')
+    {
+      unsigned long int __hi;
+      __hash = (__hash << 4) + *__name++;
+      __hi = __hash & 0xf0000000;
+      if (__hi != 0)
+	__hash ^= __hi >> 24;
+      hash &= ~__hi;
+    }
+}
+#endif
+
+/* Return the kind of file ELF describes.  */
+extern Elf_Kind	elf_kind __P ((Elf *__elf));
+
+extern Elf_Data	*elf_newdata __P ((Elf_Scn *__scn));
+
+/* Create the ELF header for ELF.  */
+extern Elf32_Ehdr *elf32_newehdr __P ((Elf *__elf));
+
+/* Create the program header for ELF, with COUNT segments.  */
+extern Elf32_Phdr *elf32_newphdr __P ((Elf *__elf, size_t __count));
+
+/* Create a new section in ELF.  */
+extern Elf_Scn *elf_newscn __P ((Elf *__elf));
+
+/* Return the section following SCN.  */
+extern Elf_Scn *elf_nextscn __P ((Elf *__elf, Elf_Scn *__scn));
+
+/* Set up ELF to read the next archive member.  */
+extern Elf_Cmd elf_next __P ((Elf *__elf));
+
+/* Set up ELF (which must describe an archive) to read the
+   archive member that starts at file position OFFSET.  */
+extern size_t elf_rand __P ((Elf *__elf, size_t __offset));
+
+extern Elf_Data *elf_rawdata __P ((Elf_Scn *__scn, Elf_Data *__data));
+
+/* Read the entire file into memory; store its size in *PTR.  */
+extern char *elf_rawfile __P ((Elf *__elf, size_t *__ptr));
+
+/* Return a pointer to the string at OFFSET bytes into the string table.
+   SECTION is the index of the SHT_STRTAB section in ELF.  */
+extern char *elf_strptr __P ((Elf *__elf, size_t __section, size_t __offset));
+
+/* If CMD is ELF_C_NULL, update ELF's data structures based on any
+   user modifications, and set the ELF_F_DIRTY flag if anything changed.
+   If CMD is ELF_C_WRITE, do that and then write the changes to the file.
+extern off_t elf_update __P ((Elf *__elf, Elf_Cmd __cmd));
+
+/* Handle ELF version VER.  Return the old version handled,
+   or EV_NONE if VER is unrecognized.  */
+extern unsigned	int elf_version __P ((unsigned int __ver));
+
+extern Elf_Data *elf32_xlatetof __P ((Elf_Data *__dst, const Elf_Data *__src,
+				      unsigned int __encode));
+extern Elf_Data *elf32_xlatetom __P ((Elf_Data *__dst, const Elf_Data *__src,
+				      unsigned int __encode));
+
+__END_DECLS
+
+#endif	/* _LIBELF_H */