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NetBSD/sys/compat/linux/linux_exec.c
fvdl fb777788b1 Don't forget to acknowledge that all the ELF stuff was taken from 
Christos' svr4 code.
1995-06-11 15:15:09 +00:00

1103 lines
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/* $NetBSD: linux_exec.c,v 1.7 1995/06/11 15:15:09 fvdl Exp $ */
/*
* Copyright (c) 1995 Frank van der Linden
* Copyright (c) 1994 Christos Zoulas
* 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.
* 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 without 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.
*
* based on exec_aout.c, sunos_exec.c and svr4_exec.c
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/resourcevar.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_map.h>
#include <vm/vm_kern.h>
#include <vm/vm_pager.h>
#include <machine/cpu.h>
#include <machine/reg.h>
#include <machine/exec.h>
#include <machine/linux_machdep.h>
#include <compat/linux/linux_types.h>
#include <compat/linux/linux_syscall.h>
#include <compat/linux/linux_syscallargs.h>
#include <compat/linux/linux_util.h>
#include <compat/linux/linux_exec.h>
struct elf_args {
u_long arg_entry; /* progran entry point */
u_long arg_interp; /* Interpreter load address */
u_long arg_phaddr; /* program header address */
u_long arg_phentsize; /* Size of program header */
u_long arg_phnum; /* Number of program headers */
};
static void *linux_aout_copyargs __P((struct exec_package *,
struct ps_strings *, void *, void *));
static void *linux_elf_copyargs __P((struct exec_package *, struct ps_strings *,
void *, void *));
static int linux_elf_check_header __P((Elf32_Ehdr *, int));
static void linux_elf_load_psection __P((struct exec_vmcmd_set *,
struct vnode *, Elf32_Phdr *, u_long *, u_long *, int *));
static int linux_elf_set_segment __P((struct exec_package *, u_long, u_long,
int));
static int linux_elf_read_from __P((struct vnode *, u_long, struct proc *,
caddr_t, int));
static int linux_elf_load_file __P((struct proc *, char *,
struct exec_vmcmd_set *, u_long *, struct elf_args *, u_long *));
#ifdef DEBUG_EXEC_LINUX_ELF
#define DPRINTF(x) printf x
#else
#define DPRINTF(x)
#endif
#define LINUX_ELF_ALIGN(a, b) ((a) & ~((b) - 1))
#define LINUX_ELF_AUX_ARGSIZ (sizeof(AuxInfo) * 8 / sizeof(char *))
#define LINUX_AOUT_AUX_ARGSIZ 2
extern int linux_error[];
extern struct sysent linux_sysent[];
extern char *linux_syscallnames[];
struct emul emul_linux_aout = {
"linux",
linux_error,
linux_sendsig,
LINUX_SYS_syscall,
LINUX_SYS_MAXSYSCALL,
linux_sysent,
linux_syscallnames,
LINUX_AOUT_AUX_ARGSIZ,
linux_aout_copyargs,
setregs,
linux_sigcode,
linux_esigcode,
};
struct emul emul_linux_elf = {
"linux",
linux_error,
linux_sendsig,
LINUX_SYS_syscall,
LINUX_SYS_MAXSYSCALL,
linux_sysent,
linux_syscallnames,
LINUX_ELF_AUX_ARGSIZ,
linux_elf_copyargs,
setregs,
linux_sigcode,
linux_esigcode,
};
static void *
linux_aout_copyargs(pack, arginfo, stack, argp)
struct exec_package *pack;
struct ps_strings *arginfo;
void *stack;
void *argp;
{
char **cpp = stack;
char **stk = stack;
char *dp, *sp;
size_t len;
void *nullp = NULL;
int argc = arginfo->ps_nargvstr;
int envc = arginfo->ps_nenvstr;
if (copyout(&argc, cpp++, sizeof(argc)))
return NULL;
/* leave room for envp and argv */
cpp += 2;
if (copyout(&cpp, &stk[1], sizeof (cpp)))
return NULL;
dp = (char *) (cpp + argc + envc + 2);
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;
if (copyout(&cpp, &stk[2], sizeof (cpp)))
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;
return cpp;
}
static void *
linux_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;
AuxInfo *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 = (AuxInfo *) cpp;
if ((ap = (struct elf_args *) pack->ep_emul_arg)) {
DPRINTF(("phaddr=0x%x, phsize=%d, phnum=%d, interp=0x%x, ",
ap->arg_phaddr, ap->arg_phentsize, ap->arg_phnum,
ap->arg_interp));
DPRINTF((" entry=0x%x\n", ap->arg_entry));
a->au_id = AUX_phdr;
a->au_v = ap->arg_phaddr;
a++;
a->au_id = AUX_phent;
a->au_v = ap->arg_phentsize;
a++;
a->au_id = AUX_phnum;
a->au_v = ap->arg_phnum;
a++;
a->au_id = AUX_pagesz;
a->au_v = NBPG;
a++;
a->au_id = AUX_base;
a->au_v = ap->arg_interp;
a++;
a->au_id = AUX_flags;
a->au_v = 0;
a++;
a->au_id = AUX_entry;
a->au_v = ap->arg_entry;
a++;
a->au_id = AUX_null;
a->au_v = 0;
a++;
free((char *) ap, M_TEMP);
}
return a;
}
#ifdef DEBUG_EXEC_LINUX_ELF
static void
print_Ehdr(e)
Elf32_Ehdr *e;
{
printf("e_ident %s, ", e->e_ident);
printf("e_type %d, ", e->e_type);
printf("e_machine %d, ", e->e_machine);
printf("e_version %ld, ", e->e_version);
printf("e_entry %lx, ", e->e_entry);
printf("e_phoff %lx, ", e->e_phoff);
printf("e_shoff %lx, ", e->e_shoff);
printf("e_flags %lx, ", e->e_flags);
printf("e_ehsize %d, ", e->e_ehsize);
printf("e_phentsize %d, ", e->e_phentsize);
printf("e_phnum %d, ", e->e_phnum);
printf("e_shentsize %d, ", e->e_shentsize);
printf("e_shnum %d, ", e->e_shnum);
printf("e_shstrndx %d\n", e->e_shstrndx);
}
static void
print_Phdr(p)
Elf32_Phdr *p;
{
static char *types[] =
{
"null", "load", "dynamic", "interp",
"note", "shlib", "phdr", "entry7"
};
printf("p_type %ld [%s], ", p->p_type, types[p->p_type & 7]);
printf("p_offset %lx, ", p->p_offset);
printf("p_vaddr %lx, ", p->p_vaddr);
printf("p_paddr %lx, ", p->p_paddr);
printf("p_filesz %ld, ", p->p_filesz);
printf("p_memsz %ld, ", p->p_memsz);
printf("p_flags %lx, ", p->p_flags);
printf("p_align %ld\n", p->p_align);
}
#endif
int
exec_linux_aout_makecmds(p, epp)
struct proc *p;
struct exec_package *epp;
{
struct exec *linux_ep = epp->ep_hdr;
int machtype, magic;
int error = ENOEXEC;
magic = LINUX_N_MAGIC(linux_ep);
machtype = LINUX_N_MACHTYPE(linux_ep);
if (machtype != LINUX_MID_MACHINE)
return (ENOEXEC);
switch (magic) {
case QMAGIC:
error = exec_linux_aout_prep_qmagic(p, epp);
break;
case ZMAGIC:
error = exec_linux_aout_prep_zmagic(p, epp);
break;
case NMAGIC:
error = exec_linux_aout_prep_nmagic(p, epp);
break;
case OMAGIC:
error = exec_linux_aout_prep_omagic(p, epp);
break;
}
if (error == 0)
epp->ep_emul = &emul_linux_aout;
return error;
}
/*
* Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400
* is very likely not page aligned on most architectures, it is treated
* as an NMAGIC here. XXX
*/
int
exec_linux_aout_prep_zmagic(p, epp)
struct proc *p;
struct exec_package *epp;
{
struct exec *execp = epp->ep_hdr;
epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC);
epp->ep_tsize = execp->a_text;
epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC);
epp->ep_dsize = execp->a_data + execp->a_bss;
epp->ep_entry = execp->a_entry;
/* set up command for text segment */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC),
VM_PROT_READ|VM_PROT_EXECUTE);
/* set up command for data segment */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC),
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
/* set up command for bss segment */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
epp->ep_daddr + execp->a_data, NULLVP, 0,
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
return exec_aout_setup_stack(p, epp);
}
/*
* exec_aout_prep_nmagic(): Prepare Linux NMAGIC package.
* Not different from the normal stuff.
*/
int
exec_linux_aout_prep_nmagic(p, epp)
struct proc *p;
struct exec_package *epp;
{
struct exec *execp = epp->ep_hdr;
long bsize, baddr;
epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC);
epp->ep_tsize = execp->a_text;
epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC);
epp->ep_dsize = execp->a_data + execp->a_bss;
epp->ep_entry = execp->a_entry;
/* set up command for text segment */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC),
VM_PROT_READ|VM_PROT_EXECUTE);
/* set up command for data segment */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC),
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
/* set up command for bss segment */
baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
bsize = epp->ep_daddr + epp->ep_dsize - baddr;
if (bsize > 0)
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
return exec_aout_setup_stack(p, epp);
}
/*
* exec_aout_prep_omagic(): Prepare Linux OMAGIC package.
* Business as usual.
*/
int
exec_linux_aout_prep_omagic(p, epp)
struct proc *p;
struct exec_package *epp;
{
struct exec *execp = epp->ep_hdr;
long dsize, bsize, baddr;
epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC);
epp->ep_tsize = execp->a_text;
epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC);
epp->ep_dsize = execp->a_data + execp->a_bss;
epp->ep_entry = execp->a_entry;
/* set up command for text and data segments */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
/* set up command for bss segment */
baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
bsize = epp->ep_daddr + epp->ep_dsize - baddr;
if (bsize > 0)
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
/*
* Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
* obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
* computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
* respectively to page boundaries.
* Compensate `ep_dsize' for the amount of data covered by the last
* text page.
*/
dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG);
epp->ep_dsize = (dsize > 0) ? dsize : 0;
return exec_aout_setup_stack(p, epp);
}
int
exec_linux_aout_prep_qmagic(p, epp)
struct proc *p;
struct exec_package *epp;
{
struct exec *execp = epp->ep_hdr;
epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC);
epp->ep_tsize = execp->a_text;
epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC);
epp->ep_dsize = execp->a_data + execp->a_bss;
epp->ep_entry = execp->a_entry;
/*
* 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 ((execp->a_text != 0 || execp->a_data != 0) &&
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;
}
epp->ep_vp->v_flag |= VTEXT;
/* set up command for text segment */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC),
VM_PROT_READ|VM_PROT_EXECUTE);
/* set up command for data segment */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC),
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
/* set up command for bss segment */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
epp->ep_daddr + execp->a_data, NULLVP, 0,
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
return exec_aout_setup_stack(p, epp);
}
/*
* linux_elf_check_header():
*
* Check header for validity; return 0 of ok ENOEXEC if error
*/
static int
linux_elf_check_header(eh, type)
Elf32_Ehdr *eh;
int type;
{
#ifdef sparc
/* #$%@#$%@#$%! */
# define memcmp bcmp
#endif
if (memcmp(eh->e_ident, Elf32_e_ident, Elf32_e_siz) != 0) {
DPRINTF(("Not an elf file\n"));
return ENOEXEC;
}
switch (eh->e_machine) {
#ifdef i386
case Elf32_em_386:
case Elf32_em_486:
#endif
#ifdef sparc
case Elf32_em_sparc:
#endif
break;
default:
DPRINTF(("Unsupported elf machine type %d\n", eh->e_machine));
return ENOEXEC;
}
if (eh->e_type != type) {
DPRINTF(("Not an elf executable\n"));
return ENOEXEC;
}
return 0;
}
/*
* linux_elf_load_psection():
*
* Load a psection at the appropriate address
*/
static void
linux_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;
long diff;
long offset;
u_long msize;
/*
* If the user specified an address, then we load there.
*/
if (*addr != ~0) {
uaddr = *addr + ph->p_align;
*addr = LINUX_ELF_ALIGN(uaddr, ph->p_align);
uaddr = LINUX_ELF_ALIGN(ph->p_vaddr, ph->p_align);
diff = ph->p_vaddr - uaddr;
} else {
uaddr = ph->p_vaddr;
*addr = LINUX_ELF_ALIGN(uaddr, ph->p_align);
diff = uaddr - *addr;
}
*prot |= (ph->p_flags & Elf32_pf_r) ? VM_PROT_READ : 0;
*prot |= (ph->p_flags & Elf32_pf_w) ? VM_PROT_WRITE : 0;
*prot |= (ph->p_flags & Elf32_pf_x) ? VM_PROT_EXECUTE : 0;
offset = ph->p_offset - diff;
*size = ph->p_filesz + diff;
msize = ph->p_memsz + diff;
DPRINTF(("Elf Seg@ 0x%x/0x%x sz %d/%d off 0x%x/0x%x[%d] algn 0x%x\n",
ph->p_vaddr, *addr, *size, msize, ph->p_offset, offset,
diff, ph->p_align));
NEW_VMCMD(vcset, vmcmd_map_readvn, *size,
*addr, vp, offset, *prot);
/*
* Check if we need to extend the size of the segment
*/
{
u_long rm = round_page(*addr + msize);
u_long rf = round_page(*addr + *size);
if (rm != rf) {
DPRINTF(("zeropad 0x%x-0x%x\n", rf, rm));
NEW_VMCMD(vcset, vmcmd_map_zero, rm - rf,
rf, NULLVP, 0, *prot);
*size = msize;
}
}
}
/*
* linux_elf_set_segment():
*
* Decide if the segment is text or data, depending on the protection
* and set it appropriately
*/
static int
linux_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.
*/
switch (prot) {
case (VM_PROT_READ | VM_PROT_EXECUTE):
if (epp->ep_tsize != ~0) {
DPRINTF(("More than one text segment\n"));
return ENOEXEC;
}
epp->ep_taddr = vaddr;
epp->ep_tsize = size;
DPRINTF(("Elf Text@ 0x%x, size %d\n", vaddr, size));
break;
case (VM_PROT_READ | VM_PROT_WRITE):
case (VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE):
if (epp->ep_dsize != ~0) {
DPRINTF(("More than one data segment\n"));
return ENOEXEC;
}
epp->ep_daddr = vaddr;
epp->ep_dsize = size;
DPRINTF(("Elf Data@ 0x%x, size %d\n", vaddr, size));
break;
default:
DPRINTF(("Bad protection 0%o\n", prot));
return ENOEXEC;
}
return 0;
}
/*
* linux_elf_read_from():
*
* Read from vnode into buffer at offset.
*/
static int
linux_elf_read_from(vp, off, p, buf, size)
struct vnode *vp;
u_long off;
struct proc *p;
caddr_t buf;
int size;
{
int error;
int resid;
DPRINTF(("read from 0x%x to 0x%x size %d\n",
off, buf, size));
if ((error = vn_rdwr(UIO_READ, vp, buf, size,
off, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
&resid, p)) != 0) {
DPRINTF(("Bad read error %d\n", error));
return error;
}
/*
* See if we got all of it
*/
if (resid != 0) {
DPRINTF(("Incomplete read for header ask=%d, rem=%d\n",
size, resid));
return error;
}
return 0;
}
/*
* linux_elf_load_file():
*
* Load a file (interpreter/library) pointed to by path
* [stolen from coff_load_shlib()]. Made slightly more generic than
* the svr4 version, for possible later use in linux_uselib().
*/
static int
linux_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;
DPRINTF(("Loading file %s @ %x\n", path, addr));
if ((error = linux_emul_find(p, NULL, linux_emul_path, path, &bp, 0)) != 0)
bp = NULL;
else
path = bp;
/*
* 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);
/* first get the vnode */
if ((error = namei(&nd)) != 0) {
if (bp != NULL)
free((char *) bp, M_TEMP);
return error;
}
if ((error = linux_elf_read_from(nd.ni_vp, 0, p, (caddr_t) &eh,
sizeof(eh))) != 0)
goto bad;
#ifdef DEBUG_EXEC_LINUX_ELF
print_Ehdr(&eh);
#endif
if ((error = linux_elf_check_header(&eh, Elf32_et_dyn)) != 0)
goto bad;
phsize = eh.e_phnum * sizeof(Elf32_Phdr);
ph = (Elf32_Phdr *) malloc(phsize, M_TEMP, M_WAITOK);
if ((error = linux_elf_read_from(nd.ni_vp, eh.e_phoff, p,
(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;
#ifdef DEBUG_EXEC_LINUX_ELF
print_Phdr(&ph[i]);
#endif
switch (ph[i].p_type) {
case Elf32_pt_load:
linux_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;
ap->arg_interp = addr;
DPRINTF(("Interpreter@ 0x%x\n", addr));
}
addr += size;
break;
case Elf32_pt_dynamic:
case Elf32_pt_phdr:
case Elf32_pt_note:
break;
default:
DPRINTF(("interp: Unexpected program header type %d\n",
ph[i].p_type));
break;
}
}
bad:
if (ph != NULL)
free((char *) ph, M_TEMP);
if (bp != NULL)
free((char *) bp, M_TEMP);
*last = addr;
vrele(nd.ni_vp);
return error;
}
/*
* exec_linux_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_linux_elf_makecmds(p, epp)
struct proc *p;
struct exec_package *epp;
{
Elf32_Ehdr *eh = epp->ep_hdr;
Elf32_Phdr *ph, *pp;
int error;
int i;
char interp[MAXPATHLEN];
u_long pos = 0;
u_long phsize;
#ifdef DEBUG_EXEC_LINUX_ELF
print_Ehdr(eh);
#endif
if (epp->ep_hdrvalid < sizeof(Elf32_Ehdr))
return ENOEXEC;
if (linux_elf_check_header(eh, Elf32_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 = linux_elf_read_from(epp->ep_vp, eh->e_phoff, p,
(caddr_t) ph, phsize)) != 0)
goto bad;
epp->ep_tsize = ~0;
epp->ep_dsize = ~0;
interp[0] = '\0';
/*
* Load all the necessary sections
*/
for (i = 0; i < eh->e_phnum; i++) {
u_long addr = ~0, size = 0;
int prot = 0;
pp = &ph[i];
#ifdef DEBUG_EXEC_LINUX_ELF
print_Phdr(pp);
#endif
switch (ph[i].p_type) {
case Elf32_pt_load:
linux_elf_load_psection(&epp->ep_vmcmds, epp->ep_vp,
&ph[i], &addr, &size, &prot);
if ((error = linux_elf_set_segment(epp, addr, size,
prot)) != 0)
goto bad;
break;
case Elf32_pt_shlib:
DPRINTF(("No support for COFF libraries (yet)\n"));
error = ENOEXEC;
goto bad;
case Elf32_pt_interp:
if (pp->p_filesz >= sizeof(interp)) {
DPRINTF(("Interpreter path too long %d\n",
pp->p_filesz));
goto bad;
}
if ((error = linux_elf_read_from(epp->ep_vp, pp->p_offset, p,
(caddr_t) interp, pp->p_filesz)) != 0)
goto bad;
break;
case Elf32_pt_dynamic:
case Elf32_pt_phdr:
case Elf32_pt_note:
break;
default:
/*
* Not fatal, we don't need to understand everything
* :-)
*/
DPRINTF(("Unsupported program header type %d\n",
pp->p_type));
break;
}
}
/*
* Check if we found a dynamically linked binary and arrange to load
* it's interpreter
*/
if (interp[0]) {
struct elf_args *ap;
pos = ~0;
ap = (struct elf_args *) malloc(sizeof(struct elf_args),
M_TEMP, M_WAITOK);
if ((error = linux_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 = LINUX_ELF_ALIGN(pos + NBPG, NBPG);
DPRINTF(("Program header @0x%x\n", pos));
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;
DPRINTF(("taddr 0x%x tsize 0x%x daddr 0x%x dsize 0x%x\n",
epp->ep_taddr, epp->ep_tsize, epp->ep_daddr, epp->ep_dsize));
free((char *) ph, M_TEMP);
DPRINTF(("Elf entry@ 0x%x\n", epp->ep_entry));
epp->ep_vp->v_flag |= VTEXT;
epp->ep_emul = &emul_linux_elf;
return exec_aout_setup_stack(p, epp);
bad:
free((char *) ph, M_TEMP);
kill_vmcmds(&epp->ep_vmcmds);
return ENOEXEC;
}
/*
* The Linux system call to load shared libraries, a.out version. The
* a.out shared libs are just files that are mapped onto a fixed
* address in the process' address space. The address is given in
* a_entry. Read in the header, set up some VM commands and run them.
*
* Yes, both text and data are mapped at once, so we're left with
* writeable text for the shared libs. The Linux crt0 seemed to break
* sometimes when data was mapped seperately. It munmapped a uselib()
* of ld.so by hand, which failed with shared text and data for ld.so
* Yuck.
*
* Because of the problem with ZMAGIC executables (text starts
* at 0x400 in the file, but needs to be mapped at 0), ZMAGIC
* shared libs are not handled very efficiently :-(
*/
int
linux_uselib(p, uap, retval)
struct proc *p;
struct linux_uselib_args /* {
syscallarg(char *) path;
} */ *uap;
register_t *retval;
{
caddr_t sg;
long bsize, dsize, tsize, taddr, baddr, daddr;
struct nameidata ni;
struct vnode *vp;
struct exec hdr;
struct exec_vmcmd_set vcset;
int rem, i, magic, error;
sg = stackgap_init();
CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
NDINIT(&ni, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&ni)))
return error;
vp = ni.ni_vp;
if ((error = vn_rdwr(UIO_READ, vp, (caddr_t) &hdr, LINUX_AOUT_HDR_SIZE,
0, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
&rem, p))) {
vrele(vp);
return error;
}
if (rem != 0) {
vrele(vp);
return ENOEXEC;
}
if (LINUX_N_MACHTYPE(&hdr) != LINUX_MID_MACHINE)
return ENOEXEC;
magic = LINUX_N_MAGIC(&hdr);
taddr = hdr.a_entry & (~(NBPG - 1));
tsize = hdr.a_text;
daddr = taddr + tsize;
dsize = hdr.a_data + hdr.a_bss;
if ((hdr.a_text != 0 || hdr.a_data != 0) && vp->v_writecount != 0) {
vrele(vp);
return ETXTBSY;
}
vp->v_flag |= VTEXT;
vcset.evs_cnt = 0;
vcset.evs_used = 0;
NEW_VMCMD(&vcset,
magic == ZMAGIC ? vmcmd_map_readvn : vmcmd_map_pagedvn,
hdr.a_text + hdr.a_data, taddr,
vp, LINUX_N_TXTOFF(hdr, magic),
VM_PROT_READ|VM_PROT_EXECUTE|VM_PROT_WRITE);
baddr = roundup(daddr + hdr.a_data, NBPG);
bsize = daddr + dsize - baddr;
if (bsize > 0) {
NEW_VMCMD(&vcset, vmcmd_map_zero, bsize, baddr,
NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
}
for (i = 0; i < vcset.evs_used && !error; i++) {
struct exec_vmcmd *vcp;
vcp = &vcset.evs_cmds[i];
error = (*vcp->ev_proc)(p, vcp);
}
kill_vmcmds(&vcset);
vrele(vp);
return error;
}
/*
* Execve(2). Just check the alternate emulation path, and pass it on
* to the NetBSD execve().
*/
int
linux_execve(p, uap, retval)
struct proc *p;
struct linux_execve_args /* {
syscallarg(char *) path;
syscallarg(char **) argv;
syscallarg(char **) envp;
} */ *uap;
register_t *retval;
{
caddr_t sg;
sg = stackgap_init();
CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
return execve(p, uap, retval);
}
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