Aren/NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

This file has been superseded by the MI ELF code.

Browse Source
This commit is contained in:
soren 2000-04-08 22:30:26 +00:00
parent 12188e5241
commit 09ad839ab3
1 changed files with 0 additions and 701 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

701
sys/arch/mips/mips/elf.c
View File

@ -1,701 +0,0 @@
/* $NetBSD: elf.c,v 1.15 1999/10/25 13:55:08 kleink Exp $ */
/* from: NetBSD: exec_elf.c,v 1.3 1995/09/16 00:28:08 thorpej Exp */
/* mips elf shared-library support from Per Fogelstrom's OpenBSD code */
/*-
* Copyright (c) 1994 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include "opt_execfmt.h"
#include "opt_compat_linux.h"
#include "opt_compat_svr4.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <sys/syscall.h>
#include <sys/signalvar.h>
#include <sys/mman.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_map.h>
#include <machine/cpu.h>
#include <machine/reg.h>
#ifdef COMPAT_LINUX
#include <compat/linux/linux_exec.h>
#endif
#ifdef COMPAT_SVR4
#include <compat/svr4/svr4_exec.h>
#endif
int (*elf_probe_funcs[])() = {
#ifdef COMPAT_SVR4
svr4_elf_probe,
#endif
#ifdef COMPAT_LINUX
linux_elf_probe
#endif
};
static int elf_set_segment __P((struct exec_package *, u_long, u_long,
int));
static int elf_read_from __P((struct proc *, struct vnode *, u_long,
caddr_t, int));
static void elf_load_psection __P((struct exec_vmcmd_set *,
struct vnode *, Elf32_Phdr *, u_long *, u_long *, int *));
void * elf_copyargs __P((struct exec_package *pack,
struct ps_strings *arginfo,
void *stack,
void *argp));
#define ELF_ALIGN(a, b) ((a) & ~((b) - 1))
/*
* This is the basic elf emul.
*/
extern char sigcode[], esigcode[];
#ifdef SYSCALL_DEBUG
extern char *syscallnames[];
#endif
struct emul emul_elf = {
"netbsd",
NULL,
sendsig,
SYS_syscall,
SYS_MAXSYSCALL,
sysent,
#ifdef SYSCALL_DEBUG
syscallnames,
#else
NULL,
#endif
sizeof(Aux32Info) * 8, /* XXX cgd */
elf_copyargs,
setregs,
sigcode,
esigcode,
};
/*
* Copy arguments onto the stack in the normal way, but add some
* extra information in case of dynamic binding.
*/
void *
elf_copyargs(pack, arginfo, stack, argp)
struct exec_package *pack;
struct ps_strings *arginfo;
void *stack;
void *argp;
{
char **cpp = stack;
char *dp, *sp;
size_t len;
void *nullp = NULL;
int argc = arginfo->ps_nargvstr;
int envc = arginfo->ps_nenvstr;
Aux32Info *a;
struct elf_args *ap;
if (copyout(&argc, cpp++, sizeof(argc)))
return NULL;
dp = (char *) (cpp + argc + envc + 2 + pack->ep_emul->e_arglen);
sp = argp;
/* XXX don't copy them out, remap them! */
arginfo->ps_argvstr = cpp; /* remember location of argv for later */
for (; --argc >= 0; sp += len, dp += len)
if (copyout(&dp, cpp++, sizeof(dp)) ||
copyoutstr(sp, dp, ARG_MAX, &len))
return NULL;
if (copyout(&nullp, cpp++, sizeof(nullp)))
return NULL;
arginfo->ps_envstr = cpp; /* remember location of envp for later */
for (; --envc >= 0; sp += len, dp += len)
if (copyout(&dp, cpp++, sizeof(dp)) ||
copyoutstr(sp, dp, ARG_MAX, &len))
return NULL;
if (copyout(&nullp, cpp++, sizeof(nullp)))
return NULL;
/*
* Push extra arguments on the stack needed by dynamically
* linked binaries
*/
a = (Aux32Info *) cpp;
if ((ap = (struct elf_args *) pack->ep_emul_arg)) {
a->a_type = AT_PHDR;
a->a_v = ap->arg_phaddr;
a++;
a->a_type = AT_PHENT;
a->a_v = ap->arg_phentsize;
a++;
a->a_type = AT_PHNUM;
a->a_v = ap->arg_phnum;
a++;
a->a_type = AT_PAGESZ;
a->a_v = NBPG;
a++;
a->a_type = AT_BASE;
a->a_v = ap->arg_interp;
a++;
a->a_type = AT_FLAGS;
a->a_v = 0;
a++;
a->a_type = AT_ENTRY;
a->a_v = ap->arg_entry;
a++;
a->a_type = AT_NULL;
a->a_v = 0;
a++;
free((char *) ap, M_TEMP);
}
return a;
}
/*
* elf_check_header():
*
* Check header for validity; return 0 of ok ENOEXEC if error
*
* XXX machine type needs to be moved to <machine/param.h> so
* just one comparison can be done. Unfortunately, there is both
* em_486 and em_386, so this would not work on the i386.
*/
int
elf_check_header(eh, type)
Elf32_Ehdr *eh;
int type;
{
if (memcmp(eh->e_ident, ELFMAG, SELFMAG) != 0 ||
eh->eh_ident[EI_CLASS] != ELFCLASS)
return ENOEXEC;
switch (eh->e_machine) {
/* XXX */
#ifdef i386
case EM_386:
case EM_486:
#endif
#ifdef sparc
case EM_sparc:
#endif
#ifdef mips
case EM_mips:
#endif
break;
default:
return ENOEXEC;
}
if (eh->e_type != type)
return ENOEXEC;
return 0;
}
/*
* elf_load_psection():
*
* Load a psection at the appropriate address
*/
static void
elf_load_psection(vcset, vp, ph, addr, size, prot)
struct exec_vmcmd_set *vcset;
struct vnode *vp;
Elf32_Phdr *ph;
u_long *addr;
u_long *size;
int *prot;
{
u_long uaddr, msize, psize, rm, rf;
long diff, offset;
/*
* If the user specified an address, then we load there.
*/
if (*addr != ELF32_NO_ADDR) {
if (ph->p_align > 1) {
*addr = ELF_ALIGN(*addr + ph->p_align, ph->p_align);
uaddr = ELF_ALIGN(ph->p_vaddr, ph->p_align);
} else
uaddr = ph->p_vaddr;
diff = ph->p_vaddr - uaddr;
} else {
*addr = uaddr = ph->p_vaddr;
if (ph->p_align > 1)
*addr = ELF_ALIGN(uaddr, ph->p_align);
diff = uaddr - *addr;
}
*prot |= (ph->p_flags & PF_R) ? VM_PROT_READ : 0;
*prot |= (ph->p_flags & PF_W) ? VM_PROT_WRITE : 0;
*prot |= (ph->p_flags & PF_X) ? VM_PROT_EXECUTE : 0;
offset = ph->p_offset - diff;
*size = ph->p_filesz + diff;
msize = ph->p_memsz + diff;
psize = round_page(*size);
if(ph->p_flags & PF_W) {
psize = trunc_page(*size);
#ifdef ELF_DEBUG
/*XXX*/ printf("mi elf: NEW_VNCMD len %x va %x off %x prot %x\n",
psize, *addr, offset, *prot);
#endif /*ELF_DEBUG*/
NEW_VMCMD(vcset, vmcmd_map_pagedvn, psize, *addr, vp, offset, *prot);
if(psize != *size) {
NEW_VMCMD(vcset, vmcmd_map_readvn, *size - psize, *addr + psize, vp, offset + psize, *prot);
#ifdef ELF_DEBUG
/*XXX*/ printf("mi elf: NEW_VNCMD, size!=psize, len %x va %x off %x prot %x\n",
*size - psize, *addr + psize, offset + psize, *prot);
#endif /*ELF_DEBUG*/
}
}
else {
NEW_VMCMD(vcset, vmcmd_map_pagedvn, psize, *addr, vp, offset, *prot);
}
/*
* Check if we need to extend the size of the segment
*/
rm = round_page(*addr + msize);
rf = round_page(*addr + *size);
if (rm != rf) {
#ifdef ELFDEBUG
/*XXX*/ printf("mi elf: rounding VNCMD len %x va %x off %x prot %x\n",
rm - rf, rf, offset, *prot);
#endif /*ELF_DEBUG*/
NEW_VMCMD(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 0, *prot);
*size = msize;
}
}
/*
* elf_set_segment():
*
* Decide if the segment is text or data, depending on the protection
* and set it appropriately
*/
static int
elf_set_segment(epp, vaddr, size, prot)
struct exec_package *epp;
u_long vaddr;
u_long size;
int prot;
{
/*
* Kludge: Unfortunately the current implementation of
* exec package assumes a single text and data segment.
* In Elf we can have more, but here we limit ourselves
* to two and hope :-(
* We also assume that the text is r-x, and data is rwx or rw-.
*/
switch (prot) {
case (VM_PROT_READ | VM_PROT_EXECUTE):
if (epp->ep_tsize != ELF32_NO_ADDR)
return ENOEXEC;
epp->ep_taddr = vaddr;
epp->ep_tsize = size;
break;
case (VM_PROT_READ | VM_PROT_WRITE):
case (VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE):
if (epp->ep_dsize != ELF32_NO_ADDR)
{
/* the following fix from christos does not work */
#if 0
long diff;
/*
* Support for sbss extra segment, by extending
* the data segment appropriately
*/
/*XXX DEBUG*/ printf("elf_set_segment(): prot %x, bad rw size %x\n",
prot, epp->ep_dsize);
if (epp->ep_daddr > vaddr)
epp->ep_daddr = vaddr;
diff = (vaddr + size) - (epp->ep_daddr + epp->ep_dsize);
if (diff > 0)
epp->ep_dsize += diff;
return 0;
#else
return ENOEXEC;
#endif
}
epp->ep_daddr = vaddr;
epp->ep_dsize = size;
break;
default:
return ENOEXEC;
}
return 0;
}
/*
* elf_read_from():
*
* Read from vnode into buffer at offset.
*/
static int
elf_read_from(p, vp, off, buf, size)
struct vnode *vp;
u_long off;
struct proc *p;
caddr_t buf;
int size;
{
int error;
size_t resid;
if ((error = vn_rdwr(UIO_READ, vp, buf, size,
off, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
&resid, p)) != 0)
return error;
/*
* See if we got all of it
*/
if (resid != 0)
return error;
return 0;
}
/*
* elf_load_file():
*
* Load a file (interpreter/library) pointed to by path
* [stolen from coff_load_shlib()]. Made slightly generic
* so it might be used externally.
*/
int
elf_load_file(p, path, vcset, entry, ap, last)
struct proc *p;
char *path;
struct exec_vmcmd_set *vcset;
u_long *entry;
struct elf_args *ap;
u_long *last;
{
int error, i;
struct nameidata nd;
Elf32_Ehdr eh;
Elf32_Phdr *ph = NULL;
u_long phsize;
char *bp = NULL;
u_long addr = *last;
bp = path;
/*
* 1. open file
* 2. read filehdr
* 3. map text, data, and bss out of it using VM_*
*/
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, path, p);
if ((error = namei(&nd)) != 0) {
return error;
}
if ((error = elf_read_from(p, nd.ni_vp, 0, (caddr_t) &eh,
sizeof(eh))) != 0)
goto bad;
if ((error = elf_check_header(&eh, ET_DYN)) != 0)
goto bad;
phsize = eh.e_phnum * sizeof(Elf32_Phdr);
ph = (Elf32_Phdr *) malloc(phsize, M_TEMP, M_WAITOK);
if ((error = elf_read_from(p, nd.ni_vp, eh.e_phoff,
(caddr_t) ph, phsize)) != 0)
goto bad;
/*
* Load all the necessary sections
*/
for (i = 0; i < eh.e_phnum; i++) {
u_long size = 0;
int prot = 0;
switch (ph[i].p_type) {
case PT_LOAD:
elf_load_psection(vcset, nd.ni_vp, &ph[i], &addr,
&size, &prot);
/* Assume that the text segment is r-x only */
if ((prot & PROT_WRITE) == 0) {
*entry = addr + eh.e_entry - ph[i].p_vaddr;
ap->arg_interp = addr;
}
addr += size;
break;
case PT_DYNAMIC:
case PT_PHDR:
case PT_NOTE:
break;
default:
break;
}
}
bad:
if (ph != NULL)
free((char *) ph, M_TEMP);
*last = addr;
vrele(nd.ni_vp);
return error;
}
/*
* exec_elf_makecmds(): Prepare an Elf binary's exec package
*
* First, set of the various offsets/lengths in the exec package.
*
* Then, mark the text image busy (so it can be demand paged) or error
* out if this is not possible. Finally, set up vmcmds for the
* text, data, bss, and stack segments.
*
*/
int
exec_elf_makecmds(p, epp)
struct proc *p;
struct exec_package *epp;
{
Elf32_Ehdr *eh = epp->ep_hdr;
Elf32_Phdr *ph, *pp;
int error, i, n;
char interp[MAXPATHLEN];
u_long pos = 0, phsize;
if (epp->ep_hdrvalid < sizeof(Elf32_Ehdr))
return ENOEXEC;
if (elf_check_header(eh, ET_EXEC))
return ENOEXEC;
/*
* check if vnode is in open for writing, because we want to
* demand-page out of it. if it is, don't do it, for various
* reasons
*/
if (epp->ep_vp->v_writecount != 0) {
#ifdef DIAGNOSTIC
if (epp->ep_vp->v_flag & VTEXT)
panic("exec: a VTEXT vnode has writecount != 0\n");
#endif
return ETXTBSY;
}
/*
* Allocate space to hold all the program headers, and read them
* from the file
*/
phsize = eh->e_phnum * sizeof(Elf32_Phdr);
ph = (Elf32_Phdr *) malloc(phsize, M_TEMP, M_WAITOK);
if ((error = elf_read_from(p, epp->ep_vp, eh->e_phoff,
(caddr_t) ph, phsize)) != 0)
goto bad;
epp->ep_tsize = ELF32_NO_ADDR;
epp->ep_dsize = ELF32_NO_ADDR;
interp[0] = '\0';
for (i = 0; i < eh->e_phnum; i++) {
pp = &ph[i];
if (pp->p_type == PT_INTERP) {
if (pp->p_filesz >= sizeof(interp))
goto bad;
if ((error = elf_read_from(p, epp->ep_vp, pp->p_offset,
(caddr_t) interp, pp->p_filesz)) != 0)
goto bad;
break;
}
}
/*
* OK, we want a slightly different twist of the
* standard emulation package for "real" elf.
*/
epp->ep_emul = &emul_elf;
pos = ELF32_NO_ADDR;
/*
* On the same architecture, we may be emulating different systems.
* See which one will accept this executable. This currently only
* applies to Linux and SVR4 on the i386.
*
* Probe functions would normally see if the interpreter (if any)
* exists. Emulation packages may possibly replace the interpreter in
* interp[] with a changed path (/emul/xxx/<path>), and also
* set the ep_emul field in the exec package structure.
*/
if ((n = sizeof elf_probe_funcs / sizeof elf_probe_funcs[0])) {
error = ENOEXEC;
for (i = 0; i < n && error; i++)
error = elf_probe_funcs[i](p, epp, interp, &pos);
if (error)
goto bad;
}
/*
* Load all the necessary sections
*/
for (i = 0; i < eh->e_phnum; i++) {
u_long addr = ELF32_NO_ADDR, size = 0;
int prot = 0;
pp = &ph[i];
switch (ph[i].p_type) {
case PT_LOAD:
elf_load_psection(&epp->ep_vmcmds, epp->ep_vp,
&ph[i], &addr, &size, &prot);
if ((error = elf_set_segment(epp, addr, size,
prot)) != 0) {
#ifdef ELF_DEBUG
/*
* This fails on binaries made by the old
* NetBSD pre-1.1 ELF toolchain, which had
*/
printf("exec_elf_makecmds: set_segment failed\n");
#endif /*ELF_DEBUG*/
goto bad;
}
break;
case PT_SHLIB:
error = ENOEXEC;
goto bad;
case PT_INTERP:
/* Already did this one */
case PT_DYNAMIC:
case PT_PHDR:
case PT_NOTE:
break;
default:
/*
* Not fatal, we don't need to understand everything
* :-)
*/
break;
}
}
/*
* Check if we found a dynamically linked binary and arrange to load
* it's interpreter
*/
if (interp[0]) {
struct elf_args *ap;
ap = (struct elf_args *) malloc(sizeof(struct elf_args),
M_TEMP, M_WAITOK);
if ((error = elf_load_file(p, interp, &epp->ep_vmcmds,
&epp->ep_entry, ap, &pos)) != 0) {
free((char *) ap, M_TEMP);
goto bad;
}
/* Arrange to load the program headers. */
pos = ELF_ALIGN(pos + NBPG, NBPG);
ap->arg_phaddr = pos;
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, phsize,
pos, epp->ep_vp, eh->e_phoff,
VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE);
pos += phsize;
ap->arg_phentsize = eh->e_phentsize;
ap->arg_phnum = eh->e_phnum;
ap->arg_entry = eh->e_entry;
epp->ep_emul_arg = ap;
} else
epp->ep_entry = eh->e_entry;
#ifdef EXEC_AOUT
free((char *) ph, M_TEMP);
epp->ep_vp->v_flag |= VTEXT;
return exec_aout_setup_stack(p, epp);
#endif
bad:
free((char *) ph, M_TEMP);
kill_vmcmds(&epp->ep_vmcmds);
return ENOEXEC;
}