freebsd-dev/sys/compat/linux/linux_misc.c
Søren Schmidt c21dee177f First incarnation of our Linux emulator or rather compatibility code.
This first shot only incorporaties so much functionality that DOOM
can run (the X version), signal handling is VERY weak, so is many
other things. But it meets my milestone number one (you guessed it
- running DOOM).

Uses /compat/linux as prefix for loading shared libs, so it won't
conflict with our own libs.

Kernel must be compiled with "options COMPAT_LINUX" for this to work.
1995-06-25 17:32:43 +00:00

661 lines
16 KiB
C

/*-
* Copyright (c) 1994-1995 Søren Schmidt
* 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
* in this position and unchanged.
* 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 withough 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.
*
* $Id: linux_misc.c,v 1.4 1995/06/08 13:50:52 sos Exp $
*/
#include <i386/linux/linux.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/exec.h>
#include <sys/mman.h>
#include <sys/proc.h>
#include <sys/dirent.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/ioctl.h>
#include <sys/imgact_aout.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/times.h>
#include <sys/utsname.h>
#include <sys/vnode.h>
#include <sys/wait.h>
#include <machine/cpu.h>
#include <machine/psl.h>
#include <machine/reg.h>
#include <vm/vm.h>
#include <vm/vm_kern.h>
struct linux_alarm_args {
unsigned int secs;
};
int
linux_alarm(struct proc *p, struct linux_alarm_args *args, int *retval)
{
extern struct timeval time;
struct itimerval it, old_it;
int s;
#ifdef DEBUG
printf("Linux-emul(%d): alarm(%d)\n", p->p_pid, args->secs);
#endif
it.it_value.tv_sec = (long)args->secs;
it.it_value.tv_usec = 0;
it.it_interval.tv_sec = 0;
it.it_interval.tv_usec = 0;
s = splclock();
old_it = p->p_realtimer;
if (timerisset(&old_it.it_value))
if (timercmp(&old_it.it_value, &time, <))
timerclear(&old_it.it_value);
else
timevalsub(&old_it.it_value, &time);
splx(s);
if (itimerfix(&it.it_value) || itimerfix(&it.it_interval))
return EINVAL;
s = splclock();
untimeout(realitexpire, (caddr_t)p);
if (timerisset(&it.it_value)) {
timevaladd(&it.it_value, &time);
timeout(realitexpire, (caddr_t)p, hzto(&it.it_value));
}
p->p_realtimer = it;
splx(s);
if (old_it.it_value.tv_usec)
old_it.it_value.tv_sec++;
*retval = old_it.it_value.tv_sec;
return 0;
}
struct linux_brk_args {
linux_caddr_t dsend;
};
int
linux_brk(struct proc *p, struct linux_brk_args *args, int *retval)
{
#if 0
struct vmspace *vm = p->p_vmspace;
vm_offset_t new, old;
int error;
extern int swap_pager_full;
if ((vm_offset_t)args->dsend < (vm_offset_t)vm->vm_daddr)
return EINVAL;
if (((caddr_t)args->dsend - (caddr_t)vm->vm_daddr)
> p->p_rlimit[RLIMIT_DATA].rlim_cur)
return ENOMEM;
old = round_page((vm_offset_t)vm->vm_daddr) + ctob(vm->vm_dsize);
new = round_page((vm_offset_t)args->dsend);
*retval = old;
if ((new-old) > 0) {
if (swap_pager_full)
return ENOMEM;
error = vm_map_find(&vm->vm_map, NULL, 0, &old, (new-old), FALSE);
if (error)
return error;
vm->vm_dsize += btoc((new-old));
*retval = (int)(vm->vm_daddr + ctob(vm->vm_dsize));
}
return 0;
#else
struct vmspace *vm = p->p_vmspace;
vm_offset_t new, old;
struct obreak_args {
vm_offset_t newsize;
} tmp;
#ifdef DEBUG
printf("Linux-emul(%d): brk(%08x)\n", p->p_pid, args->dsend);
#endif
old = (vm_offset_t)vm->vm_daddr + ctob(vm->vm_dsize);
new = (vm_offset_t)args->dsend;
tmp.newsize = new;
if (((caddr_t)new > vm->vm_daddr) && !obreak(p, &tmp, retval))
retval[0] = (int)new;
else
retval[0] = (int)old;
return 0;
#endif
}
struct linux_uselib_args {
char *library;
};
int
linux_uselib(struct proc *p, struct linux_uselib_args *args, int *retval)
{
struct nameidata ni;
struct vnode *vnodep;
struct exec *a_out = 0;
struct vattr attr;
unsigned long vmaddr, virtual_offset, file_offset;
unsigned long buffer, bss_size;
char *ptr;
char path[MAXPATHLEN];
const char *prefix = "/compat/linux";
size_t sz, len;
int error;
#ifdef DEBUG
printf("Linux-emul(%d): uselib(%s)\n", p->p_pid, args->library);
#endif
for (ptr = path; (*ptr = *prefix) != '\0'; ptr++, prefix++) ;
sz = MAXPATHLEN - (ptr - path);
if (error = copyinstr(args->library, ptr, sz, &len))
return error;
if (*ptr != '/')
return EINVAL;
#ifdef DEBUG
printf("Linux-emul(%d): uselib(%s)\n", p->p_pid, path);
#endif
NDINIT(&ni, LOOKUP, FOLLOW, UIO_SYSSPACE, path, p);
if (error = namei(&ni))
return error;
vnodep = ni.ni_vp;
if (vnodep == NULL)
return ENOEXEC;
if (vnodep->v_writecount)
return ETXTBSY;
if (error = VOP_GETATTR(vnodep, &attr, p->p_ucred, p))
return error;
if ((vnodep->v_mount->mnt_flag & MNT_NOEXEC)
|| ((attr.va_mode & 0111) == 0)
|| (attr.va_type != VREG))
return ENOEXEC;
if (attr.va_size == 0)
return ENOEXEC;
if (error = VOP_ACCESS(vnodep, VEXEC, p->p_ucred, p))
return error;
if (error = VOP_OPEN(vnodep, FREAD, p->p_ucred, p))
return error;
error = vm_mmap(kernel_map, (vm_offset_t *)&a_out, 1024,
VM_PROT_READ, VM_PROT_READ, 0, (caddr_t)vnodep, 0);
if (error)
return (error);
/*
* Is it a Linux binary ?
*/
if (((a_out->a_magic >> 16) & 0xff) != 0x64)
return -1;
/*
* Set file/virtual offset based on a.out variant.
*/
switch ((int)(a_out->a_magic & 0xffff)) {
case 0413: /* ZMAGIC */
virtual_offset = 0;
file_offset = 1024;
break;
case 0314: /* QMAGIC */
virtual_offset = 4096;
file_offset = 0;
break;
default:
return (-1);
}
vnodep->v_flag |= VTEXT;
bss_size = round_page(a_out->a_bss);
/*
* Check if file_offset page aligned,.
* Currently we cannot handle misalinged file offsets,
* and so we read in the entire image (what a waste).
*/
if (file_offset & PGOFSET) {
#ifdef DEBUG
printf("uselib: Non page aligned binary %d\n", file_offset);
#endif
/*
* Map text+data read/write/execute
*/
vmaddr = virtual_offset + round_page(a_out->a_entry);
error = vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &vmaddr,
round_page(a_out->a_text + a_out->a_data), FALSE);
if (error)
return error;
error = vm_mmap(kernel_map, &buffer,
round_page(a_out->a_text + a_out->a_data + file_offset),
VM_PROT_READ, VM_PROT_READ, MAP_FILE,
(caddr_t)vnodep, trunc_page(file_offset));
if (error)
return error;
error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr,
a_out->a_text + a_out->a_data);
if (error)
return error;
vm_map_remove(kernel_map, trunc_page(vmaddr),
round_page(a_out->a_text + a_out->a_data + file_offset));
error = vm_map_protect(&p->p_vmspace->vm_map, vmaddr,
round_page(a_out->a_text + a_out->a_data),
VM_PROT_ALL, TRUE);
if (error)
return error;
}
else {
#ifdef DEBUG
printf("uselib: Page aligned binary %d\n", file_offset);
#endif
vmaddr = virtual_offset + round_page(a_out->a_entry);
error = vm_mmap(&p->p_vmspace->vm_map, &vmaddr,
a_out->a_text + a_out->a_data,
VM_PROT_ALL, VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED,
(caddr_t)vnodep, file_offset);
if (error)
return (error);
}
#ifdef DEBUG
printf("mem=%08x = %08x %08x\n", vmaddr, ((int*)vmaddr)[0], ((int*)vmaddr)[1]);
#endif
if (bss_size != 0) {
vmaddr = virtual_offset + round_page(a_out->a_entry) +
round_page(a_out->a_text + a_out->a_data);
error = vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &vmaddr,
bss_size, FALSE);
if (error)
return error;
error = vm_map_protect(&p->p_vmspace->vm_map, vmaddr, bss_size,
VM_PROT_ALL, TRUE);
if (error)
return error;
}
return 0;
}
struct linux_select_args {
void *ptr;
};
int
linux_select(struct proc *p, struct linux_select_args *args, int *retval)
{
struct {
int nfds;
fd_set *readfds;
fd_set *writefds;
fd_set *exceptfds;
struct timeval *timeout;
} linux_args;
struct {
unsigned int nd;
fd_set *in;
fd_set *ou;
fd_set *ex;
struct timeval *tv;
} bsd_args;
int error;
if ((error = copyin((caddr_t)args->ptr, (caddr_t)&linux_args,
sizeof(linux_args))))
return error;
#ifdef DEBUG
printf("Linux-emul(%d): select(%d, %d, %d, %d, %d)\n",
p->p_pid, linux_args.nfds, linux_args.readfds,
linux_args.writefds, linux_args.exceptfds,
linux_args.timeout);
#endif
bsd_args.nd = linux_args.nfds;
bsd_args.in = linux_args.readfds;
bsd_args.ou = linux_args.writefds;
bsd_args.ex = linux_args.exceptfds;
bsd_args.tv = linux_args.timeout;
return select(p, &bsd_args, retval);
}
struct linux_getpgid_args {
int pid;
};
int
linux_getpgid(struct proc *p, struct linux_getpgid_args *args, int *retval)
{
struct proc *curproc;
#ifdef DEBUG
printf("Linux-emul(%d): getpgid(%d)\n", p->p_pid, args->pid);
#endif
if (args->pid != p->p_pid) {
if (!(curproc = pfind(args->pid)))
return ESRCH;
}
else
curproc = p;
*retval = curproc->p_pgid;
return 0;
}
int
linux_fork(struct proc *p, void *args, int *retval)
{
int error;
#ifdef DEBUG
printf("Linux-emul(%d): fork()\n", p->p_pid);
#endif
if (error = fork(p, args, retval))
return error;
if (retval[1] == 1)
retval[0] = 0;
return 0;
}
struct linux_mmap_args {
void *ptr;
};
int
linux_mmap(struct proc *p, struct linux_mmap_args *args, int *retval)
{
struct {
linux_caddr_t addr;
int len;
int prot;
int flags;
int fd;
int pos;
} linux_args;
struct {
caddr_t addr;
size_t len;
int prot;
int flags;
int fd;
long pad;
off_t pos;
} bsd_args;
int error;
if ((error = copyin((caddr_t)args->ptr, (caddr_t)&linux_args,
sizeof(linux_args))))
return error;
#ifdef DEBUG
printf("Linux-emul(%d): mmap(%08x, %d, %d, %08x, %d, %d)\n",
p->p_pid, linux_args.addr, linux_args.len, linux_args.prot,
linux_args.flags, linux_args.fd, linux_args.pos);
#endif
bsd_args.flags = 0;
if (linux_args.flags & LINUX_MAP_SHARED)
bsd_args.flags |= MAP_SHARED;
if (linux_args.flags & LINUX_MAP_PRIVATE)
bsd_args.flags |= MAP_PRIVATE;
if (linux_args.flags & LINUX_MAP_FIXED)
bsd_args.flags |= MAP_FIXED;
if (linux_args.flags & LINUX_MAP_ANON)
bsd_args.flags |= MAP_ANON;
bsd_args.addr = linux_args.addr;
bsd_args.len = linux_args.len;
bsd_args.prot = linux_args.prot;
bsd_args.fd = linux_args.fd;
bsd_args.pos = linux_args.pos;
bsd_args.pad = 0;
return mmap(p, &bsd_args, retval);
}
struct linux_pipe_args {
int *pipefds;
};
int
linux_pipe(struct proc *p, struct linux_pipe_args *args, int *retval)
{
int error;
#ifdef DEBUG
printf("Linux-emul(%d): pipe(*)\n", p->p_pid);
#endif
if (error = pipe(p, 0, retval))
return error;
if (error = copyout(retval, args->pipefds, 2*sizeof(int)))
return error;
*retval = 0;
return 0;
}
struct linux_time_args {
linux_time_t *tm;
};
int
linux_time(struct proc *p, struct linux_time_args *args, int *retval)
{
struct timeval tv;
linux_time_t tm;
int error;
#ifdef DEBUG
printf("Linux-emul(%d): time(*)\n", p->p_pid);
#endif
microtime(&tv);
tm = tv.tv_sec;
if (error = copyout(&tm, args->tm, sizeof(linux_time_t)))
return error;
*retval = tv.tv_sec;
return 0;
}
struct linux_tms {
long tms_utime;
long tms_stime;
long tms_cutime;
long tms_cstime;
};
struct linux_tms_args {
char *buf;
};
int
linux_times(struct proc *p, struct linux_tms_args *args, int *retval)
{
extern int hz;
struct timeval tv;
struct linux_tms tms;
#ifdef DEBUG
printf("Linux-emul(%d): times(*)\n", p->p_pid);
#endif
tms.tms_utime = p->p_uticks;
tms.tms_stime = p->p_sticks;
tms.tms_cutime = p->p_stats->p_cru.ru_utime.tv_sec * hz +
((p->p_stats->p_cru.ru_utime.tv_usec * hz)/1000000);
tms.tms_cstime = p->p_stats->p_cru.ru_stime.tv_sec * hz +
((p->p_stats->p_cru.ru_stime.tv_usec * hz)/1000000);
microtime(&tv);
*retval = tv.tv_sec * hz + (tv.tv_usec * hz)/1000000;
return (copyout((caddr_t)&tms, (caddr_t)args->buf,
sizeof(struct linux_tms)));
}
struct linux_newuname_t {
char sysname[65];
char nodename[65];
char release[65];
char version[65];
char machine[65];
char domainname[65];
};
struct linux_newuname_args {
char *buf;
};
int
linux_newuname(struct proc *p, struct linux_newuname_args *args, int *retval)
{
struct linux_newuname_t linux_newuname;
extern char ostype[], osrelease[], machine[];
extern char hostname[], domainname[];
#ifdef DEBUG
printf("Linux-emul(%d): newuname(*)\n", p->p_pid);
#endif
bzero(&linux_newuname, sizeof(struct linux_newuname_args));
strncpy(linux_newuname.sysname, ostype, 64);
strncpy(linux_newuname.nodename, hostname, 64);
strncpy(linux_newuname.release, osrelease, 64);
strncpy(linux_newuname.version, version, 64);
strncpy(linux_newuname.machine, machine, 64);
strncpy(linux_newuname.domainname, domainname, 64);
return (copyout((caddr_t)&linux_newuname, (caddr_t)args->buf,
sizeof(struct linux_newuname_t)));
}
struct linux_utime_args {
char *fname;
linux_time_t *timeptr;
};
int
linux_utime(struct proc *p, struct linux_utime_args *args, int *retval)
{
struct bsd_utimes_args {
char *fname;
struct timeval *tptr;
} bsdutimes;
struct timeval tv;
#ifdef DEBUG
printf("Linux-emul(%d): utime(%s, *)\n", p->p_pid, args->fname);
#endif
tv.tv_sec = (long)args->timeptr;
tv.tv_usec = 0;
bsdutimes.tptr = &tv;
bsdutimes.fname = args->fname;
return utimes(p, &bsdutimes, retval);
}
struct linux_waitpid_args {
int pid;
int *status;
int options;
};
int
linux_waitpid(struct proc *p, struct linux_waitpid_args *args, int *retval)
{
struct wait4_args {
int pid;
int *status;
int options;
struct rusage *rusage;
int compat;
} tmp;
int error, tmpstat;
#ifdef DEBUG
printf("Linux-emul(%d): waitpid(%d, *, %d)\n",
p->p_pid, args->pid, args->options);
#endif
tmp.pid = args->pid;
tmp.status = args->status;
tmp.options = args->options;
tmp.rusage = NULL;
tmp.compat = 0;
if (error = wait4(p, &tmp, retval))
return error;
if (error = copyin(args->status, &tmpstat, sizeof(int)))
return error;
if (WIFSIGNALED(tmpstat))
tmpstat = (tmpstat & 0xffffff80) |
bsd_to_linux_signal[WTERMSIG(tmpstat)];
else if (WIFSTOPPED(tmpstat))
tmpstat = (tmpstat & 0xffff00ff) |
(bsd_to_linux_signal[WSTOPSIG(tmpstat)]<<8);
return copyout(&tmpstat, args->status, sizeof(int));
}
struct linux_wait4_args {
int pid;
int *status;
int options;
struct rusage *rusage;
};
int
linux_wait4(struct proc *p, struct linux_wait4_args *args, int *retval)
{
struct wait4_args {
int pid;
int *status;
int options;
struct rusage *rusage;
int compat;
} tmp;
int error, tmpstat;
#ifdef DEBUG
printf("Linux-emul(%d): wait4(%d, *, %d, *)\n",
p->p_pid, args->pid, args->options);
#endif
tmp.pid = args->pid;
tmp.status = args->status;
tmp.options = args->options;
tmp.rusage = args->rusage;
tmp.compat = 0;
if (error = wait4(p, &tmp, retval))
return error;
if (error = copyin(args->status, &tmpstat, sizeof(int)))
return error;
if (WIFSIGNALED(tmpstat))
tmpstat = (tmpstat & 0xffffff80) |
bsd_to_linux_signal[WTERMSIG(tmpstat)];
else if (WIFSTOPPED(tmpstat))
tmpstat = (tmpstat & 0xffff00ff) |
(bsd_to_linux_signal[WSTOPSIG(tmpstat)]<<8);
return copyout(&tmpstat, args->status, sizeof(int));
}