First attempt at FreeBSD & Linux ELF support.

Compile and link a new kernel, that will give native ELF support, and
provide the hooks for other ELF interpreters as well.

To make native ELF binaries use John Polstras elf-kit-1.0.1..
For the time being also use his ld-elf.so.1 and put it in
/usr/libexec.

The Linux emulator has been enhanced to also run ELF binaries, it
is however in its very first incarnation.
Just get some Linux ELF libs (Slackware-3.0) and put them in the
prober place (/compat/linux/...).
I've ben able to run all the Slackware-3.0 binaries I've tried
so far.
(No it won't run quake yet :)

1 files changed, 213 insertions, 0 deletions

diff --git a/sys/sys/imgact_elf.h b/sys/sys/imgact_elf.h
new file mode 100644
index 0000000..d24a725
--- /dev/null
+++ b/sys/sys/imgact_elf.h
@@ -0,0 +1,213 @@
+/*-
+ * Copyright (c) 1995-1996 Søren Schmidt
+ * All rights reserved.
+ *
+ * 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
+ *    in this position and unchanged.
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software withough specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ *
+ *	$Id$
+ */
+
+#ifndef _IMGACT_ELF_H_
+#define _IMGACT_ELF_H_
+
+typedef u_int32_t Elf32_Addr;
+typedef u_int32_t Elf32_Off;
+typedef int32_t   Elf32_Sword;
+typedef u_int32_t Elf32_Word;
+typedef u_int16_t Elf32_Half;
+ 
+extern int elf_trace;
+
+#define EI_NINDENT	16
+typedef struct {
+        unsigned char   e_ident[EI_NINDENT];    /* file id */
+        Elf32_Half      e_type;                 /* type */
+        Elf32_Half      e_machine;              /* machine type */
+        Elf32_Word      e_version;              /* version number */
+        Elf32_Addr      e_entry;                /* entry point */
+        Elf32_Off       e_phoff;                /* program hdr offset */
+        Elf32_Off       e_shoff;                /* section hdr offset */
+        Elf32_Word      e_flags;                /* flags */
+        Elf32_Half      e_ehsize;               /* sizeof ehdr */
+        Elf32_Half      e_phentsize;            /* program header entry size */
+        Elf32_Half      e_phnum;                /* number of program headers */
+        Elf32_Half      e_shentsize;            /* section header entry size */
+        Elf32_Half      e_shnum;                /* number of section headers */
+        Elf32_Half      e_shstrndx;             /* string table index */
+} Elf32_Ehdr;
+
+/*
+ * Values for e_indent entry in struct Elf32_Ehdr.
+ */
+#define EI_MAG0		0
+#define EI_MAG1		1
+#define EI_MAG2		2
+#define EI_MAG3		3
+#define EI_CLASS	4
+#define EI_DATA		5
+#define EI_VERSION	6
+
+
+#define ELFMAG0		'\177'
+#define ELFMAG1		'E'
+#define ELFMAG2		'L'
+#define ELFMAG3		'F'
+#define ELFCLASSNONE	0	/* invalid class */
+#define ELFCLASS32	1	/* 32bit object class */
+#define ELFCLASS64	2	/* 64bit object class */
+#define ELFDATANONE	0	/* invalid data encoding */
+#define ELFDATA2LSB	1	/* little endian */
+#define ELFDATA2MSB	2	/* big endian */
+
+/*
+ * Values for e_version entry in struct Elf32_Ehdr.
+ */
+#define EV_NONE		0	/* invalid version */
+#define EV_CURRENT	1	/* current version */
+
+/*
+ * Values for e_type entry in struct Elf32_Ehdr.
+ */
+#define ET_NONE   	0
+#define ET_REL    	1
+#define ET_EXEC   	2
+#define ET_DYN    	3
+#define ET_CORE   	4
+#define ET_LOPROC 	5
+#define ET_HIPROC 	6
+
+/*
+ * Values for e_machine entry in struct Elf32_Ehdr.
+ */
+#define EM_NONE  	0
+#define EM_M32   	1
+#define EM_SPARC 	2
+#define EM_386   	3
+#define EM_68K   	4
+#define EM_88K   	5
+#define EM_486   	6
+#define EM_860   	7
+
+
+typedef struct {
+        Elf32_Word      p_type;         /* entry type */
+        Elf32_Off       p_offset;       /* offset */
+        Elf32_Addr      p_vaddr;        /* virtual address */
+        Elf32_Addr      p_paddr;        /* physical address */
+        Elf32_Word      p_filesz;       /* file size */
+        Elf32_Word      p_memsz;        /* memory size */
+        Elf32_Word      p_flags;        /* flags */
+        Elf32_Word      p_align;        /* memory & file alignment */
+} Elf32_Phdr;
+
+/*
+ * Values for p_type entry in struct Elf32_Phdr.
+ */
+#define PT_NULL    	0
+#define PT_LOAD    	1
+#define PT_DYNAMIC 	2
+#define PT_INTERP  	3
+#define PT_NOTE    	4
+#define PT_SHLIB   	5
+#define PT_PHDR    	6
+#define PT_LOPROC  	0x70000000
+#define PT_HIPROC  	0x7fffffff
+
+/*
+ * Values for p_flags entry in struct Elf32_Phdr.
+ */
+#define PF_X		0x1
+#define PF_W		0x2
+#define PF_R		0x4
+#define PF_MASKPROC	0xf0000000
+
+/*
+ * Auxiliary vector entry on initial stack.
+ */
+typedef struct {
+	Elf32_Sword	a_type;
+	Elf32_Word	a_val;
+} Elf32_Auxinfo;
+
+#define AUXARGS_ENTRY(pos, id, val) {suword(pos++, id); suword(pos++, val);}
+
+/* 
+ * Values for a_type in struct Elf32_Auxinfo.
+ */
+#define AT_NULL		0	/* Terminates the vector */
+#define AT_IGNORE	1	/* Ignored */
+#define AT_EXECFD	2	/* File descriptor of program to load */
+#define AT_PHDR		3	/* Program header of program already loaded */
+#define AT_PHENT	4	/* Size of each program header entry */
+#define AT_PHNUM	5	/* Number of program header entries */
+#define AT_PAGESZ	6	/* Page size in bytes */
+#define AT_BASE		7	/* Interpreter's base address */
+#define AT_FLAGS	8	/* Flags (unused for i386) */
+#define AT_ENTRY	9	/* Where interpreter should transfer control */
+
+/*
+ * The following non-standard values are used for passing information
+ * to the (FreeBSD ELF) dynamic linker. Will probably go away soon....
+ */
+#define AT_BRK		10	/* Starting point for sbrk and brk */
+#define AT_DEBUG	11	/* Debugging level */
+#define AT_COUNT	15
+
+/*
+ * The following non-standard values are used in Linux ELF binaries.
+ */
+#define AT_NOTELF	10	/* Program is not ELF ?? */
+#define AT_UID		11	/* Real uid */
+#define AT_EUID		12	/* Effective uid */
+#define AT_GID		13	/* Real gid */
+#define AT_EGID		14	/* Effective gid */
+
+/*
+ * Structure used to pass infomation from the loader to the
+ * stack fixup routine.
+ */
+typedef struct {
+	Elf32_Sword	execfd;
+	Elf32_Word	phdr;
+	Elf32_Word	phent;
+	Elf32_Word	phnum;
+	Elf32_Word	pagesz;
+	Elf32_Word	base;
+	Elf32_Word	flags;
+	Elf32_Word	entry;
+	Elf32_Word	trace;
+} Elf32_Auxargs;
+
+typedef struct {
+        struct sysentvec *sysvec;
+	char *path;
+	char *emul_path;
+} Elf32_Interp_info;
+
+#define MAX_INTERP      8
+
+int elf_insert_interp __P((Elf32_Interp_info *entry));
+int elf_remove_interp __P((Elf32_Interp_info *entry));
+
+#endif /* _IMGACT_ELF_H_ */