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freebsd-dev/sys/compat/svr4/svr4_sysvec.c
Konstantin Belousov afe1a68827 Reorganize syscall entry and leave handling. 
Extend struct sysvec with three new elements:
sv_fetch_syscall_args - the method to fetch syscall arguments from
  usermode into struct syscall_args. The structure is machine-depended
  (this might be reconsidered after all architectures are converted).
sv_set_syscall_retval - the method to set a return value for usermode
  from the syscall. It is a generalization of
  cpu_set_syscall_retval(9) to allow ABIs to override the way to set a
  return value.
sv_syscallnames - the table of syscall names.

Use sv_set_syscall_retval in kern_sigsuspend() instead of hardcoding
the call to cpu_set_syscall_retval().

The new functions syscallenter(9) and syscallret(9) are provided that
use sv_*syscall* pointers and contain the common repeated code from
the syscall() implementations for the architecture-specific syscall
trap handlers.

Syscallenter() fetches arguments, calls syscall implementation from
ABI sysent table, and set up return frame. The end of syscall
bookkeeping is done by syscallret().

Take advantage of single place for MI syscall handling code and
implement ptrace_lwpinfo pl_flags PL_FLAG_SCE, PL_FLAG_SCX and
PL_FLAG_EXEC. The SCE and SCX flags notify the debugger that the
thread is stopped at syscall entry or return point respectively.  The
EXEC flag augments SCX and notifies debugger that the process address
space was changed by one of exec(2)-family syscalls.

The i386, amd64, sparc64, sun4v, powerpc and ia64 syscall()s are
changed to use syscallenter()/syscallret(). MIPS and arm are not
converted and use the mostly unchanged syscall() implementation.

Reviewed by:	jhb, marcel, marius, nwhitehorn, stas
Tested by:	marcel (ia64), marius (sparc64), nwhitehorn (powerpc),
	stas (mips)
MFC after:	1 month
2010-05-23 18:32:02 +00:00

314 lines
8.6 KiB
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/*-
* Copyright (c) 1998 Mark Newton
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christos Zoulas.
* 4. 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/* XXX we use functions that might not exist. */
#include "opt_compat.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/sysent.h>
#include <sys/imgact.h>
#include <sys/imgact_elf.h>
#include <sys/fcntl.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/socket.h>
#include <sys/syscallsubr.h>
#include <sys/vnode.h>
#include <vm/vm.h>
#include <sys/exec.h>
#include <sys/kernel.h>
#include <machine/cpu.h>
#include <netinet/in.h>
#include <compat/svr4/svr4.h>
#include <compat/svr4/svr4_types.h>
#include <compat/svr4/svr4_syscall.h>
#include <compat/svr4/svr4_signal.h>
#include <compat/svr4/svr4_socket.h>
#include <compat/svr4/svr4_sockio.h>
#include <compat/svr4/svr4_errno.h>
#include <compat/svr4/svr4_proto.h>
#include <compat/svr4/svr4_siginfo.h>
#include <compat/svr4/svr4_util.h>
int bsd_to_svr4_errno[ELAST+1] = {
0,
SVR4_EPERM,
SVR4_ENOENT,
SVR4_ESRCH,
SVR4_EINTR,
SVR4_EIO,
SVR4_ENXIO,
SVR4_E2BIG,
SVR4_ENOEXEC,
SVR4_EBADF,
SVR4_ECHILD,
SVR4_EDEADLK,
SVR4_ENOMEM,
SVR4_EACCES,
SVR4_EFAULT,
SVR4_ENOTBLK,
SVR4_EBUSY,
SVR4_EEXIST,
SVR4_EXDEV,
SVR4_ENODEV,
SVR4_ENOTDIR,
SVR4_EISDIR,
SVR4_EINVAL,
SVR4_ENFILE,
SVR4_EMFILE,
SVR4_ENOTTY,
SVR4_ETXTBSY,
SVR4_EFBIG,
SVR4_ENOSPC,
SVR4_ESPIPE,
SVR4_EROFS,
SVR4_EMLINK,
SVR4_EPIPE,
SVR4_EDOM,
SVR4_ERANGE,
SVR4_EAGAIN,
SVR4_EINPROGRESS,
SVR4_EALREADY,
SVR4_ENOTSOCK,
SVR4_EDESTADDRREQ,
SVR4_EMSGSIZE,
SVR4_EPROTOTYPE,
SVR4_ENOPROTOOPT,
SVR4_EPROTONOSUPPORT,
SVR4_ESOCKTNOSUPPORT,
SVR4_EOPNOTSUPP,
SVR4_EPFNOSUPPORT,
SVR4_EAFNOSUPPORT,
SVR4_EADDRINUSE,
SVR4_EADDRNOTAVAIL,
SVR4_ENETDOWN,
SVR4_ENETUNREACH,
SVR4_ENETRESET,
SVR4_ECONNABORTED,
SVR4_ECONNRESET,
SVR4_ENOBUFS,
SVR4_EISCONN,
SVR4_ENOTCONN,
SVR4_ESHUTDOWN,
SVR4_ETOOMANYREFS,
SVR4_ETIMEDOUT,
SVR4_ECONNREFUSED,
SVR4_ELOOP,
SVR4_ENAMETOOLONG,
SVR4_EHOSTDOWN,
SVR4_EHOSTUNREACH,
SVR4_ENOTEMPTY,
SVR4_EPROCLIM,
SVR4_EUSERS,
SVR4_EDQUOT,
SVR4_ESTALE,
SVR4_EREMOTE,
SVR4_EBADRPC,
SVR4_ERPCMISMATCH,
SVR4_EPROGUNAVAIL,
SVR4_EPROGMISMATCH,
SVR4_EPROCUNAVAIL,
SVR4_ENOLCK,
SVR4_ENOSYS,
SVR4_EFTYPE,
SVR4_EAUTH,
SVR4_ENEEDAUTH,
SVR4_EIDRM,
SVR4_ENOMSG,
};
static int svr4_fixup(register_t **stack_base, struct image_params *imgp);
extern struct sysent svr4_sysent[];
#undef szsigcode
#undef sigcode
extern int svr4_szsigcode;
extern char svr4_sigcode[];
struct sysentvec svr4_sysvec = {
.sv_size = SVR4_SYS_MAXSYSCALL,
.sv_table = svr4_sysent,
.sv_mask = 0xff,
.sv_sigsize = SVR4_NSIG-1, /* NB: signal trans table indexed with signno-1 */
.sv_sigtbl = bsd_to_svr4_sig+1,
.sv_errsize = ELAST, /* ELAST */
.sv_errtbl = bsd_to_svr4_errno,
.sv_transtrap = NULL,
.sv_fixup = svr4_fixup,
.sv_sendsig = svr4_sendsig,
.sv_sigcode = svr4_sigcode,
.sv_szsigcode = &svr4_szsigcode,
.sv_prepsyscall = NULL,
.sv_name = "SVR4",
.sv_coredump = elf32_coredump,
.sv_imgact_try = NULL,
.sv_minsigstksz = SVR4_MINSIGSTKSZ,
.sv_pagesize = PAGE_SIZE,
.sv_minuser = VM_MIN_ADDRESS,
.sv_maxuser = VM_MAXUSER_ADDRESS,
.sv_usrstack = USRSTACK,
.sv_psstrings = PS_STRINGS,
.sv_stackprot = VM_PROT_ALL,
.sv_copyout_strings = exec_copyout_strings,
.sv_setregs = exec_setregs,
.sv_fixlimit = NULL,
.sv_maxssiz = NULL,
.sv_flags = SV_ABI_UNDEF | SV_IA32 | SV_ILP32,
.sv_set_syscall_retval = cpu_set_syscall_retval,
.sv_fetch_syscall_args = cpu_fetch_syscall_args,
.sv_syscallnames = NULL,
};
const char svr4_emul_path[] = "/compat/svr4";
Elf32_Brandinfo svr4_brand = {
.brand = ELFOSABI_SYSV,
.machine = EM_386, /* XXX only implemented for x86 so far. */
.compat_3_brand = "SVR4",
.emul_path = svr4_emul_path,
.interp_path = "/lib/libc.so.1",
.sysvec = &svr4_sysvec,
.interp_newpath = NULL,
.brand_note = NULL,
.flags = 0
};
static int
svr4_fixup(register_t **stack_base, struct image_params *imgp)
{
Elf32_Auxargs *args;
register_t *pos;
KASSERT(curthread->td_proc == imgp->proc,
("unsafe svr4_fixup(), should be curproc"));
args = (Elf32_Auxargs *)imgp->auxargs;
pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2);
if (args->execfd != -1)
AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
AUXARGS_ENTRY(pos, AT_BASE, args->base);
AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
AUXARGS_ENTRY(pos, AT_NULL, 0);
free(imgp->auxargs, M_TEMP);
imgp->auxargs = NULL;
(*stack_base)--;
**stack_base = (register_t)imgp->args->argc;
return 0;
}
/*
* Search an alternate path before passing pathname arguments on
* to system calls. Useful for keeping a separate 'emulation tree'.
*
* If cflag is set, we check if an attempt can be made to create
* the named file, i.e. we check if the directory it should
* be in exists.
*/
int
svr4_emul_find(struct thread *td, char *path, enum uio_seg pathseg,
char **pbuf, int create)
{
return (kern_alternate_path(td, svr4_emul_path, path, pathseg, pbuf,
create, AT_FDCWD));
}
static int
svr4_elf_modevent(module_t mod, int type, void *data)
{
int error;
error = 0;
switch(type) {
case MOD_LOAD:
if (elf32_insert_brand_entry(&svr4_brand) < 0) {
printf("cannot insert svr4 elf brand handler\n");
error = EINVAL;
break;
}
if (bootverbose)
printf("svr4 ELF exec handler installed\n");
svr4_sockcache_init();
break;
case MOD_UNLOAD:
/* Only allow the emulator to be removed if it isn't in use. */
if (elf32_brand_inuse(&svr4_brand) != 0) {
error = EBUSY;
} else if (elf32_remove_brand_entry(&svr4_brand) < 0) {
error = EINVAL;
}
if (error) {
printf("Could not deinstall ELF interpreter entry (error %d)\n",
error);
break;
}
if (bootverbose)
printf("svr4 ELF exec handler removed\n");
svr4_sockcache_destroy();
break;
default:
return (EOPNOTSUPP);
break;
}
return error;
}
static moduledata_t svr4_elf_mod = {
"svr4elf",
svr4_elf_modevent,
0
};
DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
MODULE_DEPEND(svr4elf, streams, 1, 1, 1);
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