recognize and execute dynamically linked executables

. generalize libexec slightly to get some more necessary information
	  from ELF files, e.g. the interpreter
	. execute dynamically linked executables when exec()ed by VFS
	. switch to netbsd variant of elf32.h exclusively, solves some
	  conflicting headers

include/arch/i386/include/elf.h

@@ -33,84 +33,10 @@
  * ELF definitions for the i386 architecture.
  */
 
-#include <sys/elf32.h>	/* Definitions common to all 32 bit architectures. */
-#if defined(__ELF_WORD_SIZE) && __ELF_WORD_SIZE == 64
-#include <sys/elf64.h>	/* Definitions common to all 64 bit architectures. */
-#endif
-
-#ifndef __ELF_WORD_SIZE
-#define	__ELF_WORD_SIZE	32	/* Used by <sys/elf_generic.h> */
-#endif
-
-#include <sys/elf_generic.h>
-
-#define	ELF_ARCH	EM_386
-
-#define	ELF_MACHINE_OK(x) ((x) == EM_386 || (x) == EM_486)
-
-/*
- * Auxiliary vector entries for passing information to the interpreter.
- *
- * The i386 supplement to the SVR4 ABI specification names this "auxv_t",
- * but POSIX lays claim to all symbols ending with "_t".
- */
-
-typedef struct {	/* Auxiliary vector entry on initial stack */
-	int	a_type;			/* Entry type. */
-	union {
-		long	a_val;		/* Integer value. */
-		void	*a_ptr;		/* Address. */
-		void	(*a_fcn)(void);	/* Function pointer (not used). */
-	} a_un;
-} Elf32_Auxinfo;
-
-#if __ELF_WORD_SIZE == 64
-/* Fake for amd64 loader support */
-typedef struct {
-	int fake;
-} Elf64_Auxinfo;
-#endif
-
-__ElfType(Auxinfo);
-
-/* Values for a_type. */
-#define	AT_NULL		0	/* Terminates the vector. */
-#define	AT_IGNORE	1	/* Ignored entry. */
-#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. */
-#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. */
-#define	AT_EXECPATH	15	/* Path to the executable. */
-#define	AT_CANARY	16	/* Canary for SSP. */
-#define	AT_CANARYLEN	17	/* Length of the canary. */
-#define	AT_OSRELDATE	18	/* OSRELDATE. */
-#define	AT_NCPUS	19	/* Number of CPUs. */
-#define	AT_PAGESIZES	20	/* Pagesizes. */
-#define	AT_PAGESIZESLEN	21	/* Number of pagesizes. */
-
-#define	AT_COUNT	22	/* Count of defined aux entry types. */
-
-/*
- * Relocation types.
- */
-
-#define	R_386_COUNT	38	/* Count of defined relocation types. */
-
 /* Define "machine" characteristics */
 #define	ELF_TARG_CLASS	ELFCLASS32
 #define	ELF_TARG_DATA	ELFDATA2LSB
 #define	ELF_TARG_MACH	EM_386
 #define	ELF_TARG_VER	1
 
-#define	ET_DYN_LOAD_ADDR 0x01001000
-
 #endif /* !_MACHINE_ELF_H_ */

include/minix/com.h

@@ -542,6 +542,12 @@
 #define PR_FORK_MSGADDR m1_p1	/* reply message address of forked child */
 #define PR_CTX_PTR	m1_p1	/* pointer to mcontext_t structure */
 
+/* Field names for EXEC sent from userland to PM. */
+#define PMEXEC_FLAGS	m1_i3	/* PMEF_* */
+
+#define PMEF_AUXVECTORS	20
+#define PMEF_AUXVECTORSPACE 0x01 /* space for PMEF_AUXVECTORS on stack */
+
 /* Flags for PR_FORK_FLAGS. */
 #define PFF_VMINHIBIT	0x01	/* Don't schedule until release by VM. */
 
@@ -797,10 +803,12 @@
 					 */
 #  define PM_FRAME		m7_p2	/* arguments and environment */
 #  define PM_FRAME_LEN		m7_i3	/* size of frame */
+#  define PM_EXECFLAGS		m7_i4	/* PMEXEC_FLAGS */
 
 /* Additional parameters for PM_EXEC_REPLY and PM_CORE_REPLY */
 #  define PM_STATUS		m7_i2	/* OK or failure */
 #  define PM_PC			m7_p1	/* program counter */
+#  define PM_NEWSP		m7_p2	/* possibly-changed stack ptr */
 
 /* Additional parameters for PM_FORK and PM_SRV_FORK */
 #  define PM_PPROC		m7_i2	/* parent process endpoint */

include/sys/Makefile

@@ -47,9 +47,7 @@ INCSYMLINKS=\
 	sys/sha1.h ${NETBSDINCSDIR}/sha1.h \
 	sys/sha2.h ${NETBSDINCSDIR}/sha2.h \
 	sys/md4.h ${NETBSDINCSDIR}/md4.h \
-	sys/md5.h ${NETBSDINCSDIR}/md5.h \
-	sys/exec_elf.h ${NETBSDINCSDIR}/elf.h \
-
+	sys/md5.h ${NETBSDINCSDIR}/md5.h 
 
 #INCSYMLINKS+=	../soundcard.h ${INCSDIR}/soundcard.h