/*
* sunos_exec_aout_prep_zmagic(): Prepare a SunOS ZMAGIC 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
sunos_exec_aout_prep_zmagic(struct lwp *l, struct exec_package *epp)
{
struct exec *execp = epp->ep_hdr;
int error;
epp->ep_taddr = SUNOS_N_TXTADDR(*execp, ZMAGIC);
epp->ep_tsize = execp->a_text;
epp->ep_daddr = SUNOS_N_DATADDR(*execp, ZMAGIC);
epp->ep_dsize = execp->a_data + execp->a_bss;
epp->ep_entry = execp->a_entry;
error = vn_marktext(epp->ep_vp);
if (error)
return (error);
/* set up command for text segment */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
epp->ep_taddr, epp->ep_vp, SUNOS_N_TXTOFF(*execp, ZMAGIC),
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, SUNOS_N_DATOFF(*execp, ZMAGIC),
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
/* set up command for bss segment */
if (execp->a_bss)
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 (*epp->ep_esch->es_setup_stack)(l, epp);
}
/*
* sunos_exec_aout_prep_omagic(): Prepare a SunOS OMAGIC binary's exec package
*/
int
sunos_exec_aout_prep_omagic(struct lwp *l, struct exec_package *epp)
{
struct exec *execp = epp->ep_hdr;
long bsize, baddr;
epp->ep_taddr = SUNOS_N_TXTADDR(*execp, OMAGIC);
epp->ep_tsize = execp->a_text;
epp->ep_daddr = SUNOS_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,
SUNOS_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, PAGE_SIZE);
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 (*epp->ep_esch->es_setup_stack)(l, epp);
}
int
exec_coff_prep_omagic(struct lwp *l, struct exec_package *epp,
struct coff_filehdr *fp, struct coff_aouthdr *ap)
{
epp->ep_taddr = COFF_SEGMENT_ALIGN(fp, ap, ap->a_tstart);
epp->ep_tsize = ap->a_tsize;
epp->ep_daddr = COFF_SEGMENT_ALIGN(fp, ap, ap->a_dstart);
epp->ep_dsize = ap->a_dsize;
epp->ep_entry = ap->a_entry;
/* set up command for text and data segments */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
ap->a_tsize + ap->a_dsize, epp->ep_taddr, epp->ep_vp,
COFF_TXTOFF(fp, ap),
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
/* set up command for bss segment */
#ifdef __sh__
if (ap->a_bsize > 0)
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, ap->a_bsize,
COFF_ROUND(ap->a_dstart + ap->a_dsize, COFF_LDPGSZ),
NULLVP, 0,
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
#else
if (ap->a_bsize > 0)
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, ap->a_bsize,
COFF_SEGMENT_ALIGN(fp, ap,
ap->a_dstart + ap->a_dsize),
NULLVP, 0,
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
#endif
return (*epp->ep_esch->es_setup_stack)(l, epp);
}
/*
* mmap one section.
*/
void
pecoff_load_section(struct exec_vmcmd_set *vcset, struct vnode *vp, struct coff_scnhdr *sh, long *addr, u_long *size, int *prot)
{
u_long diff, offset;
*addr = COFF_ALIGN(sh->s_vaddr);
diff = (sh->s_vaddr - *addr);
offset = sh->s_scnptr - diff;
*size = COFF_ROUND(sh->s_size + diff, COFF_LDPGSZ);
*prot |= (sh->s_flags & COFF_STYP_EXEC) ? VM_PROT_EXECUTE : 0;
*prot |= (sh->s_flags & COFF_STYP_READ) ? VM_PROT_READ : 0;
*prot |= (sh->s_flags & COFF_STYP_WRITE) ? VM_PROT_WRITE : 0;
if (diff == 0 && offset == COFF_ALIGN(offset))
NEW_VMCMD(vcset, vmcmd_map_pagedvn, *size, *addr, vp,
offset, *prot);
else
NEW_VMCMD(vcset, vmcmd_map_readvn, sh->s_size, sh->s_vaddr, vp,
sh->s_scnptr, *prot);
if (*size < sh->s_paddr) {
u_long baddr, bsize;
baddr = *addr + COFF_ROUND(*size, COFF_LDPGSZ);
bsize = sh->s_paddr - COFF_ROUND(*size, COFF_LDPGSZ);
DPRINTF(("additional zero space (addr %lx size %ld)\n",
baddr, bsize));
NEW_VMCMD(vcset, vmcmd_map_zero, bsize, baddr,
NULLVP, 0, *prot);
*size = COFF_ROUND(sh->s_paddr, COFF_LDPGSZ);
}
DPRINTF(("section %s loaded. (addr %lx size %ld prot %d)\n",
sh->s_name, sh->s_vaddr, sh->s_size, *prot));
}
int
exec_linux_aout_prep_nmagic(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 = round_page(epp->ep_daddr + execp->a_data);
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_setup_stack(p, epp));
}
/*
* exec_aout_prep_oldnmagic():
* Prepare the vmcmds to build a vmspace for an old NMAGIC
* binary. [BSDI]
*
* Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting
* at 0.
* XXX: There must be a better way to share this code.
*/
int
exec_aout_prep_oldnmagic(struct lwp *l, struct exec_package *epp)
{
struct exec *execp = epp->ep_hdr;
long bsize, baddr;
epp->ep_taddr = 0;
epp->ep_tsize = execp->a_text;
epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, AOUT_LDPGSZ);
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, sizeof(struct exec),
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, execp->a_text + sizeof(struct exec),
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
/* set up command for bss segment */
baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
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 (*epp->ep_esch->es_setup_stack)(l, epp);
}
/*
* exec_aout_prep_oldzmagic():
* Prepare the vmcmds to build a vmspace for an old ZMAGIC
* binary. [386BSD/BSDI/4.4BSD/NetBSD0.8]
*
* Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose
* description of operation is there.
* There were copies of this in the mac68k, hp300, and i386 ports.
*/
int
exec_aout_prep_oldzmagic(struct lwp *l, struct exec_package *epp)
{
struct exec *execp = epp->ep_hdr;
int error;
epp->ep_taddr = 0;
epp->ep_tsize = execp->a_text;
epp->ep_daddr = epp->ep_taddr + execp->a_text;
epp->ep_dsize = execp->a_data + execp->a_bss;
epp->ep_entry = execp->a_entry;
error = vn_marktext(epp->ep_vp);
if (error)
return (error);
/* set up command for text segment */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
epp->ep_taddr, epp->ep_vp, PAGE_SIZE, /* XXX CLBYTES? */
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,
execp->a_text + PAGE_SIZE, /* XXX CLBYTES? */
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
/* set up command for bss segment */
if (execp->a_bss)
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 (*epp->ep_esch->es_setup_stack)(l, epp);
}
int
exec_setup_stack(struct proc *p, struct exec_package *epp)
{
vaddr_t sgap;
#ifdef MACHINE_STACK_GROWS_UP
epp->ep_maxsaddr = USRSTACK;
epp->ep_minsaddr = USRSTACK + MAXSSIZ;
#else
epp->ep_maxsaddr = USRSTACK - MAXSSIZ;
epp->ep_minsaddr = USRSTACK;
#endif
epp->ep_ssize = round_page(p->p_rlimit[RLIMIT_STACK].rlim_cur);
if (stackgap_random != 0) {
sgap = arc4random() & (stackgap_random - 1);
sgap = trunc_page(sgap);
#ifdef MACHINE_STACK_GROWS_UP
epp->ep_maxsaddr += sgap;
epp->ep_minsaddr += sgap;
#else
epp->ep_maxsaddr -= sgap;
epp->ep_minsaddr -= sgap;
#endif
}
/*
* set up commands for stack. note that this takes *two*, one to
* map the part of the stack which we can access, and one to map
* the part which we can't.
*
* arguably, it could be made into one, but that would require the
* addition of another mapping proc, which is unnecessary
*
* note that in memory, things assumed to be: 0 ....... ep_maxsaddr
* <stack> ep_minsaddr
*/
#ifdef MACHINE_STACK_GROWS_UP
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero,
((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr),
epp->ep_maxsaddr + epp->ep_ssize, NULLVP, 0, PROT_NONE);
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize,
epp->ep_maxsaddr, NULLVP, 0,
PROT_READ | PROT_WRITE);
#else
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero,
((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr),
epp->ep_maxsaddr, NULLVP, 0, PROT_NONE);
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize,
(epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0,
PROT_READ | PROT_WRITE);
#endif
return (0);
}
int
exec_linux_aout_prep_qmagic(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");
#endif
return (ETXTBSY);
}
vn_marktext(epp->ep_vp);
/* 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_setup_stack(p, epp));
}
/*
* exec_aout_prep_oldomagic():
* Prepare the vmcmds to build a vmspace for an old OMAGIC
* binary. [BSDI]
*
* Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting
* at 0.
* XXX: There must be a better way to share this code.
*/
int
exec_aout_prep_oldomagic(struct lwp *l, struct exec_package *epp)
{
struct exec *execp = epp->ep_hdr;
long dsize, bsize, baddr;
epp->ep_taddr = 0;
epp->ep_tsize = execp->a_text;
epp->ep_daddr = epp->ep_taddr + execp->a_text;
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,
sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
/* set up command for bss segment */
baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
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,
PAGE_SIZE);
epp->ep_dsize = (dsize > 0) ? dsize : 0;
return (*epp->ep_esch->es_setup_stack)(l, epp);
}
int
exec_pecoff_prep_zmagic(struct lwp *l, struct exec_package *epp, struct coff_filehdr *fp, struct coff_aouthdr *ap, int peofs)
{
int error, i;
struct pecoff_opthdr *wp;
long daddr, baddr, bsize;
u_long tsize, dsize;
struct coff_scnhdr *sh;
struct pecoff_args *argp;
int scnsiz = sizeof(struct coff_scnhdr) * fp->f_nscns;
wp = (void *)((char *)ap + sizeof(struct coff_aouthdr));
epp->ep_tsize = ap->a_tsize;
epp->ep_daddr = VM_MAXUSER_ADDRESS;
epp->ep_dsize = 0;
/* read section header */
sh = malloc(scnsiz, M_TEMP, M_WAITOK);
error = exec_read_from(l, epp->ep_vp, peofs + PECOFF_HDR_SIZE, sh,
scnsiz);
if (error) {
free(sh, M_TEMP);
return error;
}
/*
* map section
*/
for (i = 0; i < fp->f_nscns; i++) {
int prot = /*0*/VM_PROT_WRITE;
long s_flags = sh[i].s_flags;
if ((s_flags & COFF_STYP_DISCARD) != 0)
continue;
sh[i].s_vaddr += wp->w_base; /* RVA --> VA */
if ((s_flags & COFF_STYP_TEXT) != 0) {
/* set up command for text segment */
/* DPRINTF(("COFF text addr %lx size %ld offset %ld\n",
sh[i].s_vaddr, sh[i].s_size, sh[i].s_scnptr));
*/ pecoff_load_section(&epp->ep_vmcmds, epp->ep_vp,
&sh[i], (long *)&epp->ep_taddr,
&tsize, &prot);
} else if ((s_flags & COFF_STYP_BSS) != 0) {
/* set up command for bss segment */
baddr = sh[i].s_vaddr;
bsize = sh[i].s_paddr;
if (bsize)
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero,
bsize, baddr, NULLVP, 0,
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
epp->ep_daddr = min(epp->ep_daddr, baddr);
bsize = baddr + bsize - epp->ep_daddr;
epp->ep_dsize = max(epp->ep_dsize, bsize);
} else if ((s_flags & (COFF_STYP_DATA|COFF_STYP_READ)) != 0) {
/* set up command for data segment */
/* DPRINTF(("COFF data addr %lx size %ld offset %ld\n",
sh[i].s_vaddr, sh[i].s_size, sh[i].s_scnptr));*/
pecoff_load_section(&epp->ep_vmcmds, epp->ep_vp,
&sh[i], &daddr, &dsize, &prot);
epp->ep_daddr = min(epp->ep_daddr, daddr);
dsize = daddr + dsize - epp->ep_daddr;
epp->ep_dsize = max(epp->ep_dsize, dsize);
}
}
/* set up ep_emul_arg */
argp = malloc(sizeof(struct pecoff_args), M_TEMP, M_WAITOK);
epp->ep_emul_arg = argp;
argp->a_abiversion = NETBSDPE_ABI_VERSION;
argp->a_zero = 0;
argp->a_entry = wp->w_base + ap->a_entry;
argp->a_end = epp->ep_daddr + epp->ep_dsize;
argp->a_opthdr = *wp;
/*
* load dynamic linker
*/
error = pecoff_load_file(l, epp, "/usr/libexec/ld.so.dll",
&epp->ep_vmcmds, &epp->ep_entry, argp);
if (error) {
free(sh, M_TEMP);
return error;
}
#if 0
DPRINTF(("text addr: %lx size: %ld data addr: %lx size: %ld entry: %lx\n",
epp->ep_taddr, epp->ep_tsize,
epp->ep_daddr, epp->ep_dsize,
epp->ep_entry));
#endif
free(sh, M_TEMP);
return (*epp->ep_esch->es_setup_stack)(l, epp);
}
int
linux_sys_uselib(struct proc *p, void *v, register_t *retval)
{
struct linux_sys_uselib_args /* {
syscallarg(char *) path;
} */ *uap = v;
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 i, magic, error;
size_t rem;
sg = stackgap_init(p->p_emul);
LINUX_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 = trunc_page(hdr.a_entry);
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);
}
vn_marktext(vp);
VMCMDSET_INIT(&vcset);
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 = round_page(daddr + hdr.a_data);
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);
}
/*
* 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
ELFNAME2(exec,makecmds)(struct proc *p, struct exec_package *epp)
{
Elf_Ehdr *eh = epp->ep_hdr;
Elf_Phdr *ph, *pp;
Elf_Addr phdr = 0;
int error, i;
char interp[MAXPATHLEN];
u_long pos = 0, phsize;
u_int8_t os = OOS_NULL;
if (epp->ep_hdrvalid < sizeof(Elf_Ehdr))
return (ENOEXEC);
if (ELFNAME(check_header)(eh, ET_EXEC) &&
ELFNAME(olf_check_header)(eh, ET_EXEC, &os))
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");
#endif
return (ETXTBSY);
}
/*
* Allocate space to hold all the program headers, and read them
* from the file
*/
phsize = eh->e_phnum * sizeof(Elf_Phdr);
ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, (caddr_t)ph,
phsize)) != 0)
goto bad;
epp->ep_tsize = ELFDEFNNAME(NO_ADDR);
epp->ep_dsize = ELFDEFNNAME(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 = ELFNAME(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 = &ELFNAMEEND(emul);
pos = ELFDEFNNAME(NO_ADDR);
/*
* On the same architecture, we may be emulating different systems.
* See which one will accept this executable.
*
* 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.
*/
error = ENOEXEC;
p->p_os = OOS_OPENBSD;
#ifdef NATIVE_EXEC_ELF
if (ELFNAME(os_pt_note)(p, epp, epp->ep_hdr, "OpenBSD", 8, 4) == 0) {
goto native;
}
#endif
for (i = 0;
i < sizeof(ELFNAME(probes)) / sizeof(ELFNAME(probes)[0]) && error;
i++) {
if (os == OOS_NULL || ((1 << os) & ELFNAME(probes)[i].os_mask))
error = ELFNAME(probes)[i].func ?
(*ELFNAME(probes)[i].func)(p, epp, interp, &pos, &os) :
0;
}
if (!error)
p->p_os = os;
#ifndef NATIVE_EXEC_ELF
else
goto bad;
#else
native:
#endif /* NATIVE_EXEC_ELF */
/*
* Load all the necessary sections
*/
for (i = 0; i < eh->e_phnum; i++) {
Elf_Addr addr = ELFDEFNNAME(NO_ADDR), size = 0;
int prot = 0;
pp = &ph[i];
switch (ph[i].p_type) {
case PT_LOAD:
/*
* Calcuates size of text and data segments
* by starting at first and going to end of last.
* 'rwx' sections are treated as data.
* this is correct for BSS_PLT, but may not be
* for DATA_PLT, is fine for TEXT_PLT.
*/
ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp,
&ph[i], &addr, &size, &prot, 0);
/*
* Decide whether it's text or data by looking
* at the protection of the section
*/
if (prot & VM_PROT_WRITE) {
/* data section */
if (epp->ep_dsize == ELFDEFNNAME(NO_ADDR)) {
epp->ep_daddr = addr;
epp->ep_dsize = size;
} else {
if (addr < epp->ep_daddr) {
epp->ep_dsize =
epp->ep_dsize +
epp->ep_daddr -
addr;
epp->ep_daddr = addr;
} else
epp->ep_dsize = addr+size -
epp->ep_daddr;
}
} else if (prot & VM_PROT_EXECUTE) {
/* text section */
if (epp->ep_tsize == ELFDEFNNAME(NO_ADDR)) {
epp->ep_taddr = addr;
epp->ep_tsize = size;
} else {
if (addr < epp->ep_taddr) {
epp->ep_tsize =
epp->ep_tsize +
epp->ep_taddr -
addr;
epp->ep_taddr = addr;
} else
epp->ep_tsize = addr+size -
epp->ep_taddr;
}
}
break;
case PT_SHLIB:
error = ENOEXEC;
goto bad;
case PT_INTERP:
/* Already did this one */
case PT_DYNAMIC:
case PT_NOTE:
break;
case PT_PHDR:
/* Note address of program headers (in text segment) */
phdr = pp->p_vaddr;
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 when the exec file is released.
*/
if (interp[0]) {
char *ip;
struct elf_args *ap;
ip = (char *)malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
ap = (struct elf_args *)
malloc(sizeof(struct elf_args), M_TEMP, M_WAITOK);
bcopy(interp, ip, MAXPATHLEN);
epp->ep_interp = ip;
epp->ep_interp_pos = pos;
ap->arg_phaddr = phdr;
ap->arg_phentsize = eh->e_phentsize;
ap->arg_phnum = eh->e_phnum;
ap->arg_entry = eh->e_entry;
ap->arg_os = os;
epp->ep_emul_arg = ap;
epp->ep_entry = eh->e_entry; /* keep check_exec() happy */
} else {
epp->ep_interp = NULL;
epp->ep_entry = eh->e_entry;
}
#if defined(COMPAT_SVR4) && defined(i386)
#ifndef ELF_MAP_PAGE_ZERO
/* Dell SVR4 maps page zero, yeuch! */
if (p->p_os == OOS_DELL)
#endif
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, PAGE_SIZE, 0,
epp->ep_vp, 0, VM_PROT_READ);
#endif
free((char *)ph, M_TEMP);
vn_marktext(epp->ep_vp);
return (exec_setup_stack(p, epp));
bad:
free((char *)ph, M_TEMP);
kill_vmcmds(&epp->ep_vmcmds);
return (ENOEXEC);
}
