Commit Graph

54 Commits

Author SHA1 Message Date
jhb
6eac10e3c9 MFamd64: Move extern declaration of _ucodesel and _udatasel to
<machine/md_var.h>
2014-11-02 21:40:32 +00:00
obrien
7a153194ec Change some movl's to mov's. Newer GAS no longer accept 'movl' instructions
for moving between a segment register and a 32-bit memory location.

Looked at by:	jhb
2009-01-31 11:37:21 +00:00
kib
be9c86776f Since version 4.3, gcc changed its behaviour concerning the i386/amd64
ABI and the direction flag, that is it now assumes that the direction
flag is cleared at the entry of a function and it doesn't clear once
more if needed. This new behaviour conforms to the i386/amd64 ABI.

Modify the signal handler frame setup code to clear the DF {e,r}flags
bit on the amd64/i386 for the signal handlers.

jhb@ noted that it might break old apps if they assumed DF == 1 would be
preserved in the signal handlers, but that such apps should be rare and
that older versions of gcc would not generate such apps.

Submitted by:	Aurelien Jarno <aurelien aurel32 net>
PR:	121422
Reviewed by:	jhb
MFC after:	2 weeks
2008-03-13 10:54:38 +00:00
rwatson
e0f0e9f59a Use svr4_si_{addr,code,errno,signo,trap} in preference to si_{...}.
Fix a debugging printf to printf after a variable is first assigned,
not before.

These are purely build fixes, and need inspection to make sure they
were what the original author of the previous changes intended.
2005-10-19 14:59:54 +00:00
davidxu
d78f71b996 Fix compiling. 2005-10-15 22:57:39 +00:00
davidxu
3fbdb3c215 1. Change prototype of trapsignal and sendsig to use ksiginfo_t *, most
changes in MD code are trivial, before this change, trapsignal and
   sendsig use discrete parameters, now they uses member fields of
   ksiginfo_t structure. For sendsig, this change allows us to pass
   POSIX realtime signal value to user code.

2. Remove cpu_thread_siginfo, it is no longer needed because we now always
   generate ksiginfo_t data and feed it to libpthread.

3. Add p_sigqueue to proc structure to hold shared signals which were
   blocked by all threads in the proc.

4. Add td_sigqueue to thread structure to hold all signals delivered to
   thread.

5. i386 and amd64 now return POSIX standard si_code, other arches will
   be fixed.

6. In this sigqueue implementation, pending signal set is kept as before,
   an extra siginfo list holds additional siginfo_t data for signals.
   kernel code uses psignal() still behavior as before, it won't be failed
   even under memory pressure, only exception is when deleting a signal,
   we should call sigqueue_delete to remove signal from sigqueue but
   not SIGDELSET. Current there is no kernel code will deliver a signal
   with additional data, so kernel should be as stable as before,
   a ksiginfo can carry more information, for example, allow signal to
   be delivered but throw away siginfo data if memory is not enough.
   SIGKILL and SIGSTOP have fast path in sigqueue_add, because they can
   not be caught or masked.
   The sigqueue() syscall allows user code to queue a signal to target
   process, if resource is unavailable, EAGAIN will be returned as
   specification said.
   Just before thread exits, signal queue memory will be freed by
   sigqueue_flush.
   Current, all signals are allowed to be queued, not only realtime signals.

Earlier patch reviewed by: jhb, deischen
Tested on: i386, amd64
2005-10-14 12:43:47 +00:00
imp
8d58b9df12 /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
obrien
fae4c97a55 Attempt to make the proper changes here for the proc.h commit:
Make sigaltstack as per-threaded, because per-process sigaltstack state
  is useless for threaded programs, multiple threads can not share same
  stack.
  The alternative signal stack is private for thread, no lock is needed,
  the orignal P_ALTSTACK is now moved into td_pflags and renamed to
  TDP_ALTSTACK.
  For single thread or Linux clone() based threaded program, there is no
  semantic changed, because those programs only have one kernel thread
  in every process.

which left out SVR4 bits.
2004-01-05 00:29:00 +00:00
obrien
592c484d7c Use __FBSDID(). 2003-06-10 05:05:54 +00:00
jhb
89a4eb17de - Merge struct procsig with struct sigacts.
- Move struct sigacts out of the u-area and malloc() it using the
  M_SUBPROC malloc bucket.
- Add a small sigacts_*() API for managing sigacts structures: sigacts_alloc(),
  sigacts_free(), sigacts_copy(), sigacts_share(), and sigacts_shared().
- Remove the p_sigignore, p_sigacts, and p_sigcatch macros.
- Add a mutex to struct sigacts that protects all the members of the struct.
- Add sigacts locking.
- Remove Giant from nosys(), kill(), killpg(), and kern_sigaction() now
  that sigacts is locked.
- Several in-kernel functions such as psignal(), tdsignal(), trapsignal(),
  and thread_stopped() are now MP safe.

Reviewed by:	arch@
Approved by:	re (rwatson)
2003-05-13 20:36:02 +00:00
obrien
4054bc5e58 Assembly files put thru the C preprocessor need to have C style comments. 2003-04-21 16:30:12 +00:00
jhb
9ac24ac564 Add some missing proc mutex unlocks. 2003-04-17 22:19:47 +00:00
jeff
46e6ba39f1 - Move p->p_sigmask to td->td_sigmask. Signal masks will be per thread with
a follow on commit to kern_sig.c
 - signotify() now operates on a thread since unmasked pending signals are
   stored in the thread.
 - PS_NEEDSIGCHK moves to TDF_NEEDSIGCHK.
2003-03-31 22:49:17 +00:00
alfred
d070c0a52d SCARGS removal take II. 2002-12-14 01:56:26 +00:00
alfred
4f48184fb2 Backout removal SCARGS, the code freeze is only "selectively" over. 2002-12-13 22:41:47 +00:00
alfred
d19b4e039d Remove SCARGS.
Reviewed by: md5
2002-12-13 22:27:25 +00:00
bde
63ed167625 Include <sys/systm.h> for the definition of offsetof() instead of depending
on the definition being misplaced in <sys/types.h>.  The definition probably
belongs in <sys/stddef.h>.
2002-09-05 13:08:22 +00:00
bde
14ae95f735 Moved signal handling and rescheduling from userret() to ast() so that
they aren't in the usual path of execution for syscalls and traps.
The main complication for this is that we have to set flags to control
ast() everywhere that changes the signal mask.

Avoid locking in userret() in most of the remaining cases.

Submitted by:	luoqi (first part only, long ago, reorganized by me)
Reminded by:	dillon
2002-04-04 17:49:48 +00:00
alfred
728484a745 Remove __P. 2002-03-20 07:51:46 +00:00
bde
4bc93bce95 Clear the single-step flag for signal handlers. This fixes bogus trace
traps on the first instruction of signal handlers.

In trap.c:syscall(), fake a trace trap if the single-step flag was set
on entry to the kernel, not if it will be set on exit from the kernel.
This fixes bogus trace traps after the last instruction of signal handlers.

gdb-4.18 (the version in FreeBSD) still has problems with the program in
the PR.  These seem to be due to bugs in gdb and not in FreeBSD, and are
fixed in gdb-5.1 (the distribution version).

PR:		33262
Tested by:	k Macy <kip_macy@yahoo.com>
MFC after:	1 day
2002-01-10 11:49:55 +00:00
jhb
8f1f6bfe73 If we have a p variable pointing to td->td_proc already, use it instead of
needlessly repeating the indirection in several places.  Half of the places
used td->td_proc, and half used p.  They are now consistent with each other
and all use p.
2001-09-18 21:20:58 +00:00
julian
5596676e6c KSE Milestone 2
Note ALL MODULES MUST BE RECOMPILED
make the kernel aware that there are smaller units of scheduling than the
process. (but only allow one thread per process at this time).
This is functionally equivalent to teh previousl -current except
that there is a thread associated with each process.

Sorry john! (your next MFC will be a doosie!)

Reviewed by: peter@freebsd.org, dillon@freebsd.org

X-MFC after:    ha ha ha ha
2001-09-12 08:38:13 +00:00
jhb
054237d0be Call sendsig() with the proc lock held and return with it held. 2001-09-06 22:20:41 +00:00
jhb
d82893e676 Add a new MI pointer to the process' trapframe p_frame instead of using
various differently named pointers buried under p_md.

Reviewed by:	jake (in principle)
2001-06-29 11:10:41 +00:00
markm
bcca5847d5 Undo part of the tangle of having sys/lock.h and sys/mutex.h included in
other "system" header files.

Also help the deprecation of lockmgr.h by making it a sub-include of
sys/lock.h and removing sys/lockmgr.h form kernel .c files.

Sort sys/*.h includes where possible in affected files.

OK'ed by:	bde (with reservations)
2001-05-01 08:13:21 +00:00
jhb
9cd254601b Grab the process lock while calling psignal and before calling psignal. 2001-03-07 03:37:06 +00:00
jake
fbf342ab77 Remove the leading underscore from all symbols defined in x86 asm
and used in C or vice versa.  The elf compiler uses the same names
for both.  Remove asnames.h with great prejudice; it has served its
purpose.

Note that this does not affect the ability to generate an aout kernel
due to gcc's -mno-underscores option.

moral support from:	peter, jhb
2001-02-25 06:29:04 +00:00
peter
88a22127a8 Activate USER_LDT by default. The new thread libraries are going to
depend on this.  The linux ABI emulator tries to use it for some linux
binaries too.  VM86 had a bigger cost than this and it was made default
a while ago.

Reviewed by:	jhb, imp
2001-02-23 01:25:02 +00:00
jhb
733f2050f9 - Proc locking.
- Use FreeBSD stackgap_init() semantics.
- Adjust some #ifdef's to hide unused variables.
2001-01-24 00:24:57 +00:00
marcel
75c76bdc6b Don't use p->p_sigstk.ss_flags to keep state of whether the
process is on the alternate stack or not. For compatibility
with sigstack(2) state is being updated if such is needed.

We now determine whether the process is on the alternate
stack by looking at its stack pointer. This allows a process
to siglongjmp from a signal handler on the alternate stack
to the place of the sigsetjmp on the normal stack. When
maintaining state, this would have invalidated the state
information and causing a subsequent signal to be delivered
on the normal stack instead of the alternate stack.

PR: 22286
2000-11-30 05:23:49 +00:00
phk
db841f6fcc Remove unneeded <stddef.h> #includes. 2000-10-29 16:57:42 +00:00
obrien
05f7bf4f57 Cleanup after repo copy of sys/svr4 to sys/compat/svr4. 2000-08-31 22:54:09 +00:00
obrien
5840ec82fc AT&T asm syntax requires a leading '*' in front of the operand for indirect
calls and jumps.
2000-05-10 01:21:15 +00:00
newton
bf5443aad0 Pre-freeze cleanups: Conditionalize debugging writes on DEBUG_SVR4,
eliminate warnings, etc.

Note that svr4_setcontext() and svr4_getcontext() currently don't work
correctly, which makes returning from signal handlers somewhat problematic
(for reference:  the SysVR4 setcontext() and getcontext() syscalls behave
like a low-level version of setjmp() and longjmp(), in that they save and
restore process context.  SysVR4 uses this to implement its signal handler
trampoline:  The context which is saved before a signal handler is called
is restored by an implicit call to the setcontext() syscall when the signal
handler returns.  That currently doesn't work right in this emulator,
although it used to).

I'm committing this anyway, with a caveat that it's buggy, so that I can
(a) note the bug for anyone who is wondering about it, and (b) get the
stuff I've done to improve (but not fix) the situation in the tree before
4.0 is released.  If I have time to fix it totally RSN I'll talk to Jordan
to see if I can bend him into letting me commit a bugfix :-)

Note that the situation now is somewhat better than it was yesterday
anyway, because I've fixed the handling of svr4_sigsets which previously
was causing signal handlers to not get called at all.  Stay tuned for
an upcoming commit to svr4_signal.c...
2000-01-15 15:29:37 +00:00
newton
164674f31b Include #warning about unconditionalizing VM86, which isn't supposed to work
in the svr4 emulator yet.
2000-01-15 15:23:14 +00:00
bde
a3a13cc929 Fixed a missing forward declaration. I don't know why I though the
declaration of `struct proc' in svr4_genassym.c was unused.  It was
just misplaced.
2000-01-09 09:57:19 +00:00
bde
8e2cc0f4ff Include <stddef.h> here so that <sys/assym.h> can be unpolluted.
Include <sys/param.h> before <sys/assym.h> in case any of the magic
in the former is ever needed in the latter.

Removed an unused forward declaration and an unused include.
2000-01-08 19:56:03 +00:00
newton
f5362a443e Unbreak LINT -- typedefs from signal.h are needed to make prototypes in
this file make sense.
2000-01-05 21:28:46 +00:00
marcel
80b06aacc8 Make offsetof equivalent with <stddef.h>. This paves the way for
further enhancements/reorganisations.

Discussed with: bde
2000-01-03 16:49:39 +00:00
marcel
882af3f7d6 Use genassym(1) and <sys/assym.h> to generate assembler symbols. 1999-12-23 21:19:32 +00:00
newton
1b15e9efa0 Remove unnecessary includes
Prodded by:	phk
1999-12-08 12:01:59 +00:00
phk
8e3c3eafed useracc() the prequel:
Merge the contents (less some trivial bordering the silly comments)
of <vm/vm_prot.h> and <vm/vm_inherit.h> into <vm/vm.h>.  This puts
the #defines for the vm_inherit_t and vm_prot_t types next to their
typedefs.

This paves the road for the commit to follow shortly: change
useracc() to use VM_PROT_{READ|WRITE} rather than B_{READ|WRITE}
as argument.
1999-10-29 18:09:36 +00:00
luoqi
fd8b4427a5 Add a per-signal flag to mark handlers registered with osigaction, so we
can provide the correct context to each signal handler.

Fix broken sigsuspend(): don't use p_oldsigmask as a flag, use SAS_OLDMASK
as we did before the linuxthreads support merge (submitted by bde).

Move ps_sigstk from to p_sigacts to the main proc structure since signal
stack should not be shared among threads.

Move SAS_OLDMASK and SAS_ALTSTACK flags from sigacts::ps_flags to proc::p_flag.
Move PS_NOCLDSTOP and PS_NOCLDWAIT flags from proc::p_flag to procsig::ps_flag.

Reviewed by:	marcel, jdp, bde
1999-10-11 20:33:17 +00:00
marcel
bd000d73ad sigset_t change (part 4 of 5)
-----------------------------

The compatibility code and/or emulators have been updated:

iBCS2 now mostly uses the older syscalls. SVR4 now properly
handles all signals. This has been achieved by using the
new sigset_t throughout the emulator. The Linuxulator has
been severely updated. Internally the new Linux sigset_t is
made the default. These are then mapped to and from the
new FreeBSD sigset_t.

Also, rt_sigsuspend has been implemented in the Linuxulator.
Implementing this syscall basicly caused all this sigset_t
changing in the first place and the syscall has been used
throughout the change as a means for testing. It basicly is
too much work to undo the implementation so that it can
later be added again.

A special note on the use of sv_sigtbl and sv_sigsize in
struct sysentvec:
Every signal larger than sv_sigsize is not translated and is
passed on to the signal handler unmodified. Signals in the
range 1 upto and including sv_sigsize are translated.
The rationale is that only the system defined signals need to
be translated.

The emulators also have been updated so that the translation
tables are only indexed for valid (system defined) signals.
This change also fixes the translation bug already in the
SVR4 emulator.
1999-09-29 15:12:18 +00:00
peter
3b842d34e8 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
newton
8cce2a845a Replace ".align 2" with "ALIGN_TEXT" as per recent discussion re: the linux
emulator.

Suggested by:	bde
1999-08-25 22:55:56 +00:00
newton
5f5a02888b Add $Id$ tags.
Clean-up some unused (or to-be-used) variables in svr4_getcontext()
1999-07-30 12:47:17 +00:00
newton
f45463e353 Back out last commit (did I get all of them?)
Submitted by:	Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
1999-06-02 15:35:46 +00:00
jlemon
b5d4171ff6 Unifdef VM86.
Reviewed by:	silence on on -current
1999-06-01 18:20:36 +00:00
luoqi
af7e9be5cc Enable vmspace sharing on SMP. Major changes are,
- %fs register is added to trapframe and saved/restored upon kernel entry/exit.
- Per-cpu pages are no longer mapped at the same virtual address.
- Each cpu now has a separate gdt selector table. A new segment selector
  is added to point to per-cpu pages, per-cpu global variables are now
  accessed through this new selector (%fs). The selectors in gdt table are
  rearranged for cache line optimization.
- fask_vfork is now on as default for both UP and SMP.
- Some aio code cleanup.

Reviewed by:	Alan Cox	<alc@cs.rice.edu>
		John Dyson	<dyson@iquest.net>
		Julian Elischer	<julian@whistel.com>
		Bruce Evans	<bde@zeta.org.au>
		David Greenman	<dg@root.com>
1999-04-28 01:04:33 +00:00