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/* $OpenBSD: exec.h,v 1.42 2020/06/28 09:29:57 kettenis Exp $ */
/* $NetBSD: exec.h,v 1.59 1996/02/09 18:25:09 christos Exp $ */
/*-
* Copyright (c) 1994 Christopher G. Demetriou
* Copyright (c) 1993 Theo de Raadt
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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.
* 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. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* @(#)exec.h 8.3 (Berkeley) 1/21/94
*/
#ifndef _SYS_EXEC_H_
#define _SYS_EXEC_H_
/*
* The following structure is found at the top of the user stack of each
* user process. The ps program uses it to locate argv and environment
* strings. Programs that wish ps to display other information may modify
* it; normally ps_argvstr points to argv[0], and ps_nargvstr is the same
* as the program's argc. The fields ps_envstr and ps_nenvstr are the
* equivalent for the environment.
*/
struct ps_strings {
char **ps_argvstr; /* first of 0 or more argument strings */
int ps_nargvstr; /* the number of argument strings */
char **ps_envstr; /* first of 0 or more environment strings */
int ps_nenvstr; /* the number of environment strings */
};
/*
* Below the PS_STRINGS and sigtramp, we may require a gap on the stack
* (used to copyin/copyout various emulation data structures).
*/
#define STACKGAPLEN (2*1024) /* plenty enough for now */
/*
* the following structures allow execve() to put together processes
* in a more extensible and cleaner way.
*
* the exec_package struct defines an executable being execve()'d.
* it contains the header, the vmspace-building commands, the vnode
* information, and the arguments associated with the newly-execve'd
* process.
*
* the exec_vmcmd struct defines a command description to be used
* in creating the new process's vmspace.
*/
struct proc;
struct exec_package;
typedef int (*exec_makecmds_fcn)(struct proc *, struct exec_package *);
struct execsw {
u_int es_hdrsz; /* size of header for this format */
exec_makecmds_fcn es_check; /* function to check exec format */
};
struct exec_vmcmd {
int (*ev_proc)(struct proc *p, struct exec_vmcmd *cmd);
/* procedure to run for region of vmspace */
u_long ev_len; /* length of the segment to map */
u_long ev_addr; /* address in the vmspace to place it at */
struct vnode *ev_vp; /* vnode pointer for the file w/the data */
u_long ev_offset; /* offset in the file for the data */
u_int ev_prot; /* protections for segment */
int ev_flags;
#define VMCMD_RELATIVE 0x0001 /* ev_addr is relative to base entry */
#define VMCMD_BASE 0x0002 /* marks a base entry */
#define VMCMD_STACK 0x0004 /* create with UVM_FLAG_STACK */
#define VMCMD_SYSCALL 0x0008 /* create with UVM_FLAG_SYSCALL */
};
#define EXEC_DEFAULT_VMCMD_SETSIZE 8 /* # of cmds in set to start */
/* exec vmspace-creation command set; see below */
struct exec_vmcmd_set {
u_int evs_cnt;
u_int evs_used;
struct exec_vmcmd *evs_cmds;
struct exec_vmcmd evs_start[EXEC_DEFAULT_VMCMD_SETSIZE];
};
struct exec_package {
char *ep_name; /* file's name */
void *ep_hdr; /* file's exec header */
u_int ep_hdrlen; /* length of ep_hdr */
u_int ep_hdrvalid; /* bytes of ep_hdr that are valid */
struct nameidata *ep_ndp; /* namei data pointer for lookups */
struct exec_vmcmd_set ep_vmcmds; /* vmcmds used to build vmspace */
struct vnode *ep_vp; /* executable's vnode */
struct vattr *ep_vap; /* executable's attributes */
u_long ep_taddr; /* process's text address */
u_long ep_tsize; /* size of process's text */
u_long ep_daddr; /* process's data(+bss) address */
u_long ep_dsize; /* size of process's data(+bss) */
u_long ep_maxsaddr; /* proc's max stack addr ("top") */
u_long ep_minsaddr; /* proc's min stack addr ("bottom") */
u_long ep_ssize; /* size of process's stack */
u_long ep_entry; /* process's entry point */
u_int ep_flags; /* flags; see below. */
char **ep_fa; /* a fake args vector for scripts */
int ep_fd; /* a file descriptor we're holding */
struct emul *ep_emul; /* os emulation */
void *ep_emul_arg; /* emulation argument */
size_t ep_emul_argsize; /* emulation argument size */
void *ep_emul_argp; /* emulation argument pointer */
char *ep_interp; /* name of interpreter if any */
};
#define EXEC_INDIR 0x0001 /* script handling already done */
#define EXEC_HASFD 0x0002 /* holding a shell script */
#define EXEC_HASARGL 0x0004 /* has fake args vector */
#define EXEC_SKIPARG 0x0008 /* don't copy user-supplied argv[0] */
#define EXEC_DESTR 0x0010 /* destructive ops performed */
#define EXEC_WXNEEDED 0x0020 /* executable will violate W^X */
#ifdef _KERNEL
/*
* functions used either by execve() or the various cpu-dependent execve()
* hooks.
*/
int exec_makecmds(struct proc *, struct exec_package *);
int exec_runcmds(struct proc *, struct exec_package *);
void vmcmdset_extend(struct exec_vmcmd_set *);
void kill_vmcmds(struct exec_vmcmd_set *evsp);
int vmcmd_map_pagedvn(struct proc *, struct exec_vmcmd *);
int vmcmd_map_readvn(struct proc *, struct exec_vmcmd *);
int vmcmd_map_zero(struct proc *, struct exec_vmcmd *);
int vmcmd_randomize(struct proc *, struct exec_vmcmd *);
void *copyargs(struct exec_package *,
struct ps_strings *,
void *, void *);
void setregs(struct proc *, struct exec_package *,
u_long, register_t *);
int check_exec(struct proc *, struct exec_package *);
int exec_setup_stack(struct proc *, struct exec_package *);
int exec_process_vmcmds(struct proc *, struct exec_package *);
#ifdef DEBUG
void new_vmcmd(struct exec_vmcmd_set *evsp,
int (*proc)(struct proc *p, struct exec_vmcmd *),
u_long len, u_long addr, struct vnode *vp, u_long offset,
u_int prot, int flags);
#define NEW_VMCMD(evsp,proc,len,addr,vp,offset,prot) \
new_vmcmd(evsp,proc,len,addr,vp,offset,prot, 0);
#define NEW_VMCMD2(evsp,proc,len,addr,vp,offset,prot,flags) \
new_vmcmd(evsp,proc,len,addr,vp,offset,prot,flags)
#else /* DEBUG */
#define NEW_VMCMD(evsp,proc,len,addr,vp,offset,prot) \
NEW_VMCMD2(evsp,proc,len,addr,vp,offset,prot,0)
#define NEW_VMCMD2(evsp,proc,len,addr,vp,offset,prot,flags) do { \
struct exec_vmcmd *__vcp; \
if ((evsp)->evs_used >= (evsp)->evs_cnt) \
vmcmdset_extend(evsp); \
__vcp = &(evsp)->evs_cmds[(evsp)->evs_used++]; \
__vcp->ev_proc = (proc); \
__vcp->ev_len = (len); \
__vcp->ev_addr = (addr); \
if ((__vcp->ev_vp = (vp)) != NULLVP) \
vref(vp); \
__vcp->ev_offset = (offset); \
__vcp->ev_prot = (prot); \
__vcp->ev_flags = (flags); \
} while (0)
#endif /* DEBUG */
/* Initialize an empty vmcmd set */
#define VMCMDSET_INIT(vmc) do { \
(vmc)->evs_cnt = EXEC_DEFAULT_VMCMD_SETSIZE; \
(vmc)->evs_cmds = (vmc)->evs_start; \
(vmc)->evs_used = 0; \
} while (0)
/*
* Exec function switch:
*
* Note that each makecmds function is responsible for loading the
* exec package with the necessary functions for any exec-type-specific
* handling.
*
* Functions for specific exec types should be defined in their own
* header file.
*/
extern struct execsw execsw[];
extern int nexecs;
extern int exec_maxhdrsz;
/*
* If non-zero, stackgap_random specifies the upper limit of the random gap size
* added to the fixed stack position. Must be n^2.
*/
extern int stackgap_random;
/* Limit on total PT_OPENBSD_RANDOMIZE bytes. */
#define ELF_RANDOMIZE_LIMIT 1024*1024
#endif /* _KERNEL */
#ifndef N_PAGSIZ
#define N_PAGSIZ(ex) (__LDPGSZ)
#endif
/*
* Legacy a.out structures and defines; start deleting these when
* external use no longer exist.
*/
/*
* Header prepended to each a.out file.
* only manipulate the a_midmag field via the
* N_SETMAGIC/N_GET{MAGIC,MID,FLAG} macros below.
*/
struct exec {
u_int32_t a_midmag; /* htonl(flags<<26|mid<<16|magic) */
u_int32_t a_text; /* text segment size */
u_int32_t a_data; /* initialized data size */
u_int32_t a_bss; /* uninitialized data size */
u_int32_t a_syms; /* symbol table size */
u_int32_t a_entry; /* entry point */
u_int32_t a_trsize; /* text relocation size */
u_int32_t a_drsize; /* data relocation size */
};
/* a_magic */
#define OMAGIC 0407 /* old impure format */
#define NMAGIC 0410 /* read-only text */
#define ZMAGIC 0413 /* demand load format */
#define QMAGIC 0314 /* "compact" demand load format; deprecated */
/*
* a_mid - keep sorted in numerical order for sanity's sake
* ensure that: 0 < mid < 0x3ff
*/
#define MID_ZERO 0 /* unknown - implementation dependent */
#define MID_SUN010 1 /* sun 68010/68020 binary */
#define MID_SUN020 2 /* sun 68020-only binary */
#define MID_PC386 100 /* 386 PC binary. (so quoth BFD) */
#define MID_ROMPAOS 104 /* old IBM RT */
#define MID_I386 134 /* i386 BSD binary */
#define MID_M68K 135 /* m68k BSD binary with 8K page sizes */
#define MID_M68K4K 136 /* DO NOT USE: m68k BSD binary with 4K page sizes */
#define MID_NS32532 137 /* ns32532 */
#define MID_SPARC 138 /* sparc */
#define MID_PMAX 139 /* pmax */
#define MID_VAX1K 140 /* vax 1k page size */
#define MID_ALPHA 141 /* Alpha BSD binary */
#define MID_MIPS 142 /* big-endian MIPS */
#define MID_ARM6 143 /* ARM6 */
#define MID_SH3 145 /* SH3 */
#define MID_POWERPC 149 /* big-endian PowerPC */
#define MID_VAX 150 /* vax */
#define MID_SPARC64 151 /* LP64 sparc */
#define MID_MIPS2 152 /* MIPS2 */
#define MID_M88K 153 /* m88k BSD binary */
#define MID_HPPA 154 /* hppa */
#define MID_AMD64 157 /* AMD64 */
#define MID_MIPS64 158 /* big-endian MIPS64 */
#define MID_ARM64 159 /* ARM64 */
#define MID_POWERPC64 160 /* big-endian 64-bit PowerPC */
#define MID_HP200 200 /* hp200 (68010) BSD binary */
#define MID_HP300 300 /* hp300 (68020+68881) BSD binary */
#define MID_HPUX 0x20C /* hp200/300 HP-UX binary */
#define MID_HPUX800 0x20B /* hp800 HP-UX binary pa1.0 */
#define MID_HPPA11 0x210 /* hp700 HP-UX binary pa1.1 */
#define MID_HPPA20 0x214 /* hp700 HP-UX binary pa2.0 */
/*
* a_flags
*/
#define EX_DYNAMIC 0x20
#define EX_PIC 0x10
#define EX_DPMASK 0x30
/*
* Interpretation of the (a_flags & EX_DPMASK) bits:
*
* 00 traditional executable or object file
* 01 object file contains PIC code (set by `as -k')
* 10 dynamic executable
* 11 position independent executable image
* (eg. a shared library)
*
*/
/*
* The a.out structure's a_midmag field is a network-byteorder encoding
* of this int
* FFFFFFmmmmmmmmmmMMMMMMMMMMMMMMMM
* Where `F' is 6 bits of flag like EX_DYNAMIC,
* `m' is 10 bits of machine-id like MID_I386, and
* `M' is 16 bits worth of magic number, ie. ZMAGIC.
* The macros below will set/get the needed fields.
*/
#define N_GETMAGIC(ex) \
( (((ex).a_midmag)&0xffff0000) ? (ntohl(((ex).a_midmag))&0xffff) : ((ex).a_midmag))
#define N_GETMAGIC2(ex) \
( (((ex).a_midmag)&0xffff0000) ? (ntohl(((ex).a_midmag))&0xffff) : \
(((ex).a_midmag) | 0x10000) )
#define N_GETMID(ex) \
( (((ex).a_midmag)&0xffff0000) ? ((ntohl(((ex).a_midmag))>>16)&0x03ff) : MID_ZERO )
#define N_GETFLAG(ex) \
( (((ex).a_midmag)&0xffff0000) ? ((ntohl(((ex).a_midmag))>>26)&0x3f) : 0 )
#define N_SETMAGIC(ex,mag,mid,flag) \
( (ex).a_midmag = htonl( (((flag)&0x3f)<<26) | (((mid)&0x03ff)<<16) | \
(((mag)&0xffff)) ) )
#define N_ALIGN(ex,x) \
(N_GETMAGIC(ex) == ZMAGIC || N_GETMAGIC(ex) == QMAGIC ? \
((x) + __LDPGSZ - 1) & ~(__LDPGSZ - 1) : (x))
/* Valid magic number check. */
#define N_BADMAG(ex) \
(N_GETMAGIC(ex) != NMAGIC && N_GETMAGIC(ex) != OMAGIC && \
N_GETMAGIC(ex) != ZMAGIC && N_GETMAGIC(ex) != QMAGIC)
/* Address of the bottom of the text segment. */
#define N_TXTADDR(ex) (N_GETMAGIC2(ex) == (ZMAGIC|0x10000) ? 0 : __LDPGSZ)
/* Address of the bottom of the data segment. */
#define N_DATADDR(ex) \
(N_GETMAGIC(ex) == OMAGIC ? N_TXTADDR(ex) + (ex).a_text : \
(N_TXTADDR(ex) + (ex).a_text + __LDPGSZ - 1) & ~(__LDPGSZ - 1))
/* Address of the bottom of the bss segment. */
#define N_BSSADDR(ex) \
(N_DATADDR(ex) + (ex).a_data)
/* Text segment offset. */
#define N_TXTOFF(ex) \
( N_GETMAGIC2(ex)==ZMAGIC || N_GETMAGIC2(ex)==(QMAGIC|0x10000) ? \
0 : (N_GETMAGIC2(ex)==(ZMAGIC|0x10000) ? __LDPGSZ : \
sizeof(struct exec)) )
/* Data segment offset. */
#define N_DATOFF(ex) \
N_ALIGN(ex, N_TXTOFF(ex) + (ex).a_text)
/* Text relocation table offset. */
#define N_TRELOFF(ex) \
(N_DATOFF(ex) + (ex).a_data)
/* Data relocation table offset. */
#define N_DRELOFF(ex) \
(N_TRELOFF(ex) + (ex).a_trsize)
/* Symbol table offset. */
#define N_SYMOFF(ex) \
(N_DRELOFF(ex) + (ex).a_drsize)
/* String table offset. */
#define N_STROFF(ex) \
(N_SYMOFF(ex) + (ex).a_syms)
#include <machine/exec.h>
#endif /* !_SYS_EXEC_H_ */
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