bsd-user: Move stack initializtion into a per-os file.
Move all of the stack initialization into target_os_stack.h. Each BSD sets up processes a little differently. Signed-off-by: Stacey Son <sson@FreeBSD.org> Signed-off-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh
Warner Losh
parent
03ecf078fa
commit
534217f784
|
|
@ -0,0 +1,181 @@
|
|||
/*
|
||||
* FreeBSD setup_initial_stack() implementation.
|
||||
*
|
||||
* Copyright (c) 2013-14 Stacey D. Son
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#ifndef _TARGET_OS_STACK_H_
|
||||
#define _TARGET_OS_STACK_H_
|
||||
|
||||
#include <sys/param.h>
|
||||
#include "target_arch_sigtramp.h"
|
||||
#include "qemu/guest-random.h"
|
||||
|
||||
/*
|
||||
* The inital FreeBSD stack is as follows:
|
||||
* (see kern/kern_exec.c exec_copyout_strings() )
|
||||
*
|
||||
* Hi Address -> char **ps_argvstr (struct ps_strings for ps, w, etc.)
|
||||
* unsigned ps_nargvstr
|
||||
* char **ps_envstr
|
||||
* PS_STRINGS -> unsigned ps_nenvstr
|
||||
*
|
||||
* machine dependent sigcode (sv_sigcode of size
|
||||
* sv_szsigcode)
|
||||
*
|
||||
* execpath (absolute image path for rtld)
|
||||
*
|
||||
* SSP Canary (sizeof(long) * 8)
|
||||
*
|
||||
* page sizes array (usually sizeof(u_long) )
|
||||
*
|
||||
* "destp" -> argv, env strings (up to 262144 bytes)
|
||||
*/
|
||||
static inline int setup_initial_stack(struct bsd_binprm *bprm,
|
||||
abi_ulong *ret_addr, abi_ulong *stringp)
|
||||
{
|
||||
int i;
|
||||
abi_ulong stack_hi_addr;
|
||||
size_t execpath_len, stringspace;
|
||||
abi_ulong destp, argvp, envp, p;
|
||||
struct target_ps_strings ps_strs;
|
||||
char canary[sizeof(abi_long) * 8];
|
||||
|
||||
stack_hi_addr = p = target_stkbas + target_stksiz;
|
||||
|
||||
/* Save some space for ps_strings. */
|
||||
p -= sizeof(struct target_ps_strings);
|
||||
|
||||
/* Add machine depedent sigcode. */
|
||||
p -= TARGET_SZSIGCODE;
|
||||
if (setup_sigtramp(p, (unsigned)offsetof(struct target_sigframe, sf_uc),
|
||||
TARGET_FREEBSD_NR_sigreturn)) {
|
||||
errno = EFAULT;
|
||||
return -1;
|
||||
}
|
||||
if (bprm->fullpath) {
|
||||
execpath_len = strlen(bprm->fullpath) + 1;
|
||||
p -= roundup(execpath_len, sizeof(abi_ulong));
|
||||
if (memcpy_to_target(p, bprm->fullpath, execpath_len)) {
|
||||
errno = EFAULT;
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
/* Add canary for SSP. */
|
||||
qemu_guest_getrandom_nofail(canary, sizeof(canary));
|
||||
p -= roundup(sizeof(canary), sizeof(abi_ulong));
|
||||
if (memcpy_to_target(p, canary, sizeof(canary))) {
|
||||
errno = EFAULT;
|
||||
return -1;
|
||||
}
|
||||
/* Add page sizes array. */
|
||||
p -= sizeof(abi_ulong);
|
||||
if (put_user_ual(TARGET_PAGE_SIZE, p)) {
|
||||
errno = EFAULT;
|
||||
return -1;
|
||||
}
|
||||
/*
|
||||
* Deviate from FreeBSD stack layout: force stack to new page here
|
||||
* so that signal trampoline is not sharing the page with user stack
|
||||
* frames. This is actively harmful in qemu as it marks pages with
|
||||
* code it translated as read-only, which is somewhat problematic
|
||||
* for user trying to use the stack as intended.
|
||||
*/
|
||||
p = rounddown(p, TARGET_PAGE_SIZE);
|
||||
|
||||
/* Calculate the string space needed */
|
||||
stringspace = 0;
|
||||
for (i = 0; i < bprm->argc; ++i) {
|
||||
stringspace += strlen(bprm->argv[i]) + 1;
|
||||
}
|
||||
for (i = 0; i < bprm->envc; ++i) {
|
||||
stringspace += strlen(bprm->envp[i]) + 1;
|
||||
}
|
||||
if (stringspace > TARGET_ARG_MAX) {
|
||||
errno = ENOMEM;
|
||||
return -1;
|
||||
}
|
||||
/* Make room for the argv and envp strings */
|
||||
destp = rounddown(p - stringspace, sizeof(abi_ulong));
|
||||
p = argvp = destp - (bprm->argc + bprm->envc + 2) * sizeof(abi_ulong);
|
||||
/* Remember the strings pointer */
|
||||
if (stringp) {
|
||||
*stringp = destp;
|
||||
}
|
||||
/*
|
||||
* Add argv strings. Note that the argv[] vectors are added by
|
||||
* loader_build_argptr()
|
||||
*/
|
||||
/* XXX need to make room for auxargs */
|
||||
ps_strs.ps_argvstr = tswapl(argvp);
|
||||
ps_strs.ps_nargvstr = tswap32(bprm->argc);
|
||||
for (i = 0; i < bprm->argc; ++i) {
|
||||
size_t len = strlen(bprm->argv[i]) + 1;
|
||||
|
||||
if (memcpy_to_target(destp, bprm->argv[i], len)) {
|
||||
errno = EFAULT;
|
||||
return -1;
|
||||
}
|
||||
if (put_user_ual(destp, argvp)) {
|
||||
errno = EFAULT;
|
||||
return -1;
|
||||
}
|
||||
argvp += sizeof(abi_ulong);
|
||||
destp += len;
|
||||
}
|
||||
if (put_user_ual(0, argvp)) {
|
||||
errno = EFAULT;
|
||||
return -1;
|
||||
}
|
||||
/*
|
||||
* Add env strings. Note that the envp[] vectors are added by
|
||||
* loader_build_argptr().
|
||||
*/
|
||||
envp = argvp + sizeof(abi_ulong);
|
||||
ps_strs.ps_envstr = tswapl(envp);
|
||||
ps_strs.ps_nenvstr = tswap32(bprm->envc);
|
||||
for (i = 0; i < bprm->envc; ++i) {
|
||||
size_t len = strlen(bprm->envp[i]) + 1;
|
||||
|
||||
if (memcpy_to_target(destp, bprm->envp[i], len)) {
|
||||
errno = EFAULT;
|
||||
return -1;
|
||||
}
|
||||
if (put_user_ual(destp, envp)) {
|
||||
errno = EFAULT;
|
||||
return -1;
|
||||
}
|
||||
envp += sizeof(abi_ulong);
|
||||
destp += len;
|
||||
}
|
||||
if (put_user_ual(0, envp)) {
|
||||
errno = EFAULT;
|
||||
return -1;
|
||||
}
|
||||
if (memcpy_to_target(stack_hi_addr - sizeof(ps_strs), &ps_strs,
|
||||
sizeof(ps_strs))) {
|
||||
errno = EFAULT;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (ret_addr) {
|
||||
*ret_addr = p;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif /* !_TARGET_OS_STACK_H_ */
|
||||
|
|
@ -0,0 +1,56 @@
|
|||
/*
|
||||
* NetBSD setup_initial_stack() implementation.
|
||||
*
|
||||
* Copyright (c) 2013-14 Stacey D. Son
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#ifndef _TARGET_OS_STACK_H_
|
||||
#define _TARGET_OS_STACK_H_
|
||||
|
||||
#include "target_arch_sigtramp.h"
|
||||
|
||||
static inline int setup_initial_stack(struct bsd_binprm *bprm, abi_ulong *p,
|
||||
abi_ulong *stringp)
|
||||
{
|
||||
int i;
|
||||
abi_ulong stack_base;
|
||||
|
||||
stack_base = (target_stkbas + target_stksiz) -
|
||||
MAX_ARG_PAGES * TARGET_PAGE_SIZE;
|
||||
if (p) {
|
||||
*p = stack_base;
|
||||
}
|
||||
if (stringp) {
|
||||
*stringp = stack_base;
|
||||
}
|
||||
|
||||
for (i = 0; i < MAX_ARG_PAGES; i++) {
|
||||
if (bprm->page[i]) {
|
||||
info->rss++;
|
||||
if (!memcpy_to_target(stack_base, bprm->page[i],
|
||||
TARGET_PAGE_SIZE)) {
|
||||
errno = EFAULT;
|
||||
return -1;
|
||||
}
|
||||
g_free(bprm->page[i]);
|
||||
}
|
||||
stack_base += TARGET_PAGE_SIZE;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif /* !_TARGET_OS_STACK_H_ */
|
||||
|
|
@ -0,0 +1,56 @@
|
|||
/*
|
||||
* OpenBSD setup_initial_stack() implementation.
|
||||
*
|
||||
* Copyright (c) 2013-14 Stacey D. Son
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#ifndef _TARGET_OS_STACK_H_
|
||||
#define _TARGET_OS_STACK_H_
|
||||
|
||||
#include "target_arch_sigtramp.h"
|
||||
|
||||
static inline int setup_initial_stack(struct bsd_binprm *bprm, abi_ulong *p,
|
||||
abi_ulong *stringp)
|
||||
{
|
||||
int i;
|
||||
abi_ulong stack_base;
|
||||
|
||||
stack_base = (target_stkbas + target_stksiz) -
|
||||
MAX_ARG_PAGES * TARGET_PAGE_SIZE;
|
||||
if (p) {
|
||||
*p = stack_base;
|
||||
}
|
||||
if (stringp) {
|
||||
*stringp = stack_base;
|
||||
}
|
||||
|
||||
for (i = 0; i < MAX_ARG_PAGES; i++) {
|
||||
if (bprm->page[i]) {
|
||||
info->rss++;
|
||||
if (!memcpy_to_target(stack_base, bprm->page[i],
|
||||
TARGET_PAGE_SIZE)) {
|
||||
errno = EFAULT;
|
||||
return -1;
|
||||
}
|
||||
g_free(bprm->page[i]);
|
||||
}
|
||||
stack_base += TARGET_PAGE_SIZE;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif /* !_TARGET_OS_STACK_H_ */
|
||||
Loading…
Reference in New Issue