Commit Graph

81 Commits

Author SHA1 Message Date
peter
075e9da352 Protect the setting of the fsbase/gsbase MSR registers and the
pcb_[fg]sbase values with a critical section, like the rest of the kernel.
2008-03-23 22:44:56 +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
attilio
e9fc4edc44 Optimize vmmeter locking.
In particular:
- Add an explicative table for locking of struct vmmeter members
- Apply new rules for some of those members
- Remove some unuseful comments

Heavily reviewed by: alc, bde, jeff
Approved by: jeff (mentor)
2007-06-10 21:59:14 +00:00
attilio
e333d0ff0e Rework the PCPU_* (MD) interface:
- Rename PCPU_LAZY_INC into PCPU_INC
- Add the PCPU_ADD interface which just does an add on the pcpu member
  given a specific value.

Note that for most architectures PCPU_INC and PCPU_ADD are not safe.
This is a point that needs some discussions/work in the next days.

Reviewed by: alc, bde
Approved by: jeff (mentor)
2007-06-04 21:38:48 +00:00
kmacy
2061110785 Newer versions of gcc don't support treating structures passed by value
as if they were really passed by reference. Specifically, the dead stores
elimination pass in the GCC 4.1 optimiser breaks the non-compliant behavior
on which FreeBSD relied. This change brings FreeBSD up to date by switching
trap frames to being explicitly passed by reference.

Reviewed by: kan
Tested by: kan
2006-12-17 06:48:40 +00:00
davidxu
0fa66af83d Move some declaration of 32-bit signal structures into file
freebsd32-signal.h, implement sigtimedwait and sigwaitinfo system calls.
2006-10-05 01:56:11 +00:00
davidxu
98bfdf3a78 Stop reloading %fs and %gs, since it causes the base address from
GDT to be loaded into FS.base and GS.base, these values of course
are not the values set by sysarch() with I386_SET_FSBASE and
I386_SET_GSBASE, the change fixed a crash for 32bit libthr after
signal handler returned and normal code is accessing thread pointer,
for example: movl %gs:8, %eax.
2006-09-23 13:42:09 +00:00
jhb
3a707d012d Retire SYF_ARGMASK and remove both SYF_MPSAFE and SYF_ARGMASK. sy_narg is
now back to just being an argument count.
2006-07-28 20:22:58 +00:00
jhb
c62c38439f Now that all system calls are MPSAFE, retire the SYF_MPSAFE flag used to
mark system calls as being MPSAFE:
- Stop conditionally acquiring Giant around system call invocations.
- Remove all of the 'M' prefixes from the master system call files.
- Remove support for the 'M' prefix from the script that generates the
  syscall-related files from the master system call files.
- Don't explicitly set SYF_MPSAFE when registering nfssvc.
2006-07-28 19:05:28 +00:00
jhb
12302c47d0 Unify the checking for lock misbehavior in the various syscall()
implementations and adjust some of the checks while I'm here:
- Add a new check to make sure we don't return from a syscall in a critical
  section.
- Add a new explicit check before userret() to make sure we don't return
  with any locks held.  The advantage here is that we can include the
  syscall number and name in syscall() whereas that info is not available
  in userret().
- Drop the mtx_assert()'s of sched_lock and Giant.  They are replaced by
  the more general checks just added.

MFC after:	2 weeks
2006-07-27 22:32:30 +00:00
jhb
d832089727 Add KTR_SYSC tracing to the syscall() implementations that didn't have it
yet.

MFC after:	1 week
2006-07-27 21:25:50 +00:00
jhb
39705fd8c6 Add missing ptrace(2) system-call stops to various syscall()
implementations.

MFC after:	1 week
2006-07-27 19:50:16 +00:00
phk
74f8e63a10 Simplify system time accounting for profiling.
Rename struct thread's td_sticks to td_pticks, we will need the
other name for more appropriately named use shortly.  Reduce it
from uint64_t to u_int.

Clear td_pticks whenever we enter the kernel instead of recording
its value as reference for userret().  Use the absolute value of
td->pticks in userret() and eliminate third argument.
2006-02-08 08:09:17 +00:00
wsalamon
ece839695d Call the audit syscall enter/exit functions for the amd64 architecture,
both 32-bit and 64-bit paths. System calls will now be audited.

Obtained from: TrustedBSD Project
Approved by: rwatson (mentor)
2006-02-04 20:37:20 +00:00
peter
a854646ee0 Catch up to the system siginfo changes. Use a union for the ia32 layout
of siginfo just like the system one.  There are now two fields to copy
instead of one.
2005-12-06 23:06:29 +00:00
ru
e54ad157b2 Catch up with the recent <sys/signal.h> change and make this compile. 2005-11-04 20:32:26 +00:00
ps
e35ed17897 include opt_compat.h to unbreak the build 2005-10-24 00:00:00 +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
peter
4c39c2be2f Don't set segment registers via ptrace yet. Its not ready. 2005-10-04 23:26:00 +00:00
peter
fe69f6532f Implement 32 bit getcontext/setcontext/swapcontext on amd64. I've added
stubs for ia64 to keep it compiling.  These are used by 32 bit apps such
as gdb.
2005-09-27 18:04:20 +00:00
peter
921b3c5ee4 Jumbo-commit to enhance 32 bit application support on 64 bit kernels.
This is good enough to be able to run a RELENG_4 gdb binary against
a RELENG_4 application, along with various other tools (eg: 4.x gcore).
We use this at work.

ia32_reg.[ch]: handle the 32 bit register file format, used by ptrace,
	procfs and core dumps.
procfs_*regs.c: vary the format of proc/XXX/*regs depending on the client
	and target application.
procfs_map.c: Don't print a 64 bit value to 32 bit consumers, or their
	sscanf fails.  They expect an unsigned long.
imgact_elf.c: produce a valid 32 bit coredump for 32 bit apps.
sys_process.c: handle 32 bit consumers debugging 32 bit targets.  Note
	that 64 bit consumers can still debug 32 bit targets.

IA64 has got stubs for ia32_reg.c.

Known limitations: a 5.x/6.x gdb uses get/setcontext(), which isn't
implemented in the 32/64 wrapper yet.  We also make a tiny patch to
gdb pacify it over conflicting formats of ld-elf.so.1.

Approved by:	re
2005-06-30 07:49:22 +00:00
jhb
f9da7305b5 Use PCPU_LAZY_INC() for cnt.v_{intr,trap,syscalls} rather than atomic
operations in some places and simple non-per CPU math in others.
2005-04-12 23:18:54 +00:00
julian
ee753ed190 Remove sched_free_thread() which was only used
in diagnostics. It has outlived its usefulness and has started
causing panics for people who turn on DIAGNOSTIC, in what is otherwise
good code.

MFC after:	2 days
2004-08-31 06:12:13 +00:00
bde
f15855a457 Don't repeat the definition of IDTVEC(). It is in asmacros.h. 2004-05-24 11:28:11 +00:00
bde
aead6fc992 Added profiling support for Xint0x80_syscall. 2004-05-23 19:06:15 +00:00
imp
ceab5f79a3 Remove advertising clause from University of California Regent's license,
per letter dated July 22, 1999 and email from Peter Wemm.

Approved by: core, peter
2004-04-05 23:55:14 +00:00
peter
7f7fe0e81c Catch up with some proc/procsig locking improvements that were made to the
i386 version and were not merged over.
2004-02-21 23:34:42 +00:00
davidxu
f39653dda8 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.

Reviewed by: deischen, dfr
2004-01-03 02:02:26 +00:00
peter
9524d14ce6 Catch up with the procsig locking changes elsewhere. We were doing
things like copyin/out with psp->ps_mtx held.  That was not good.

Approved by:  re (scottl)
2003-12-03 07:00:30 +00:00
peter
9dedda25aa Initial landing of SMP support for FreeBSD/amd64.
- This is heavily derived from John Baldwin's apic/pci cleanup on i386.
- I have completely rewritten or drastically cleaned up some other parts.
  (in particular, bootstrap)
- This is still a WIP.  It seems that there are some highly bogus bioses
  on nVidia nForce3-150 boards.  I can't stress how broken these boards
  are.  I have a workaround in mind, but right now the Asus SK8N is broken.
  The Gigabyte K8NPro (nVidia based) is also mind-numbingly hosed.
- Most of my testing has been with SCHED_ULE.  SCHED_4BSD works.
- the apic and acpi components are 'standard'.
- If you have an nVidia nForce3-150 board, you are stuck with 'device
  atpic' in addition, because they somehow managed to forget to connect the
  8254 timer to the apic, even though its in the same silicon!  ARGH!
  This directly violates the ACPI spec.
2003-11-17 08:58:16 +00:00
peter
72cf6d90a3 Stop pretending to support kernel profiling. The FAKE_MCOUNT() etc
calls are just gradually getting more and more stale.  At this point it
would be better to start from scratch once prof_machdep.c is adapted.
2003-11-13 02:38:33 +00:00
peter
b652116ae9 Move a MD 32 bit binary support routine into the MD areas. exec_setregs
is highly MD in an emulation environment since it operates on the host
environment.  Although the setregs functions are really for exec support
rather than signals, they deal with the same sorts of context and include
files.  So I put it there rather than create yet another file.
2003-11-08 07:43:44 +00:00
peter
a2fff099b7 The great s/npx/fpu/gi 2003-11-08 03:33:38 +00:00
peter
724da5f111 MFi386 by jhb: use symbolic constants for the IDT entries. 2003-09-22 22:09:02 +00:00
peter
e95056563d Switch to using the emulator in the common compat area.
Still work-in-progress.
2003-08-23 00:04:53 +00:00
peter
aecc3981a1 Initial sweep at dividing up the generic 32bit-on-64bit kernel support
from the ia32 specific stuff.  Some of this still needs to move to the MI
freebsd32 area, and some needs to move to the MD area.  This is still
work-in-progress.
2003-08-22 23:19:02 +00:00
peter
ba0d622c9f Regen 2003-08-21 03:48:50 +00:00
peter
96b31600a1 This is too funny for words. Swap syscalls 416 and 417 around. It works
better that way when sigaction() and sigreturn() do the right thing.
2003-08-21 03:48:05 +00:00
obrien
02a4f42b9a Use __FBSDID().
Brought to you by:	a boring talk at Ottawa Linux Symposium
2003-07-25 21:19:19 +00:00
peter
a32db9797c Regenerate. 2003-05-31 06:51:04 +00:00
peter
3afe1a4377 Make this compile with WITNESS enabled. It wants the syscall names. 2003-05-31 06:49:53 +00:00
peter
99d1672b3d Deal with the user VM space expanding. 32 bit applications do not like
having their stack at the 512GB mark.  Give 4GB of user VM space for 32
bit apps.  Note that this is significantly more than on i386 which gives
only about 2.9GB of user VM to a process (1GB for kernel, plus page
table pages which eat user VM space).

Approved by: re (blanket)
2003-05-23 05:07:33 +00:00
peter
12d7e4bee6 Collect the nastiness for preserving the kernel MSR_GSBASE around the
load_gs() calls into a single place that is less likely to go wrong.

Eliminate the per-process context switching of MSR_GSBASE, because it
should be constant for a single cpu.  Instead, save/restore it during
the loading of the new %gs selector for the new process.

Approved by:	re (amd64/* blanket)
2003-05-15 00:23:40 +00:00
peter
c177f59bbf Regen
Approved by: re (amd64 blanket)
2003-05-14 04:11:25 +00:00
peter
770abdbb9c Add BASIC i386 binary support for the amd64 kernel. This is largely
stolen from the ia64/ia32 code (indeed there was a repocopy), but I've
redone the MD parts and added and fixed a few essential syscalls.  It
is sufficient to run i386 binaries like /bin/ls, /usr/bin/id (dynamic)
and p4.  The ia64 code has not implemented signal delivery, so I had
to do that.

Before you say it, yes, this does need to go in a common place.  But
we're in a freeze at the moment and I didn't want to risk breaking ia64.
I will sort this out after the freeze so that the common code is in a
common place.

On the AMD64 side, this required adding segment selector context switch
support and some other support infrastructure.  The %fs/%gs etc code
is hairy because loading %gs will clobber the kernel's current MSR_GSBASE
setting.  The segment selectors are not used by the kernel, so they're only
changed at context switch time or when changing modes.  This still needs
to be optimized.

Approved by:	re (amd64/* blanket)
2003-05-14 04:10:49 +00:00
jhb
dcf45ed625 Regen. 2003-04-25 15:59:44 +00:00
jhb
011ef0f3d8 Oops, the thr_* and jail_attach() syscall entries should be NOPROTO rather
than STD.
2003-04-25 15:59:18 +00:00
jhb
968ad4dbc6 Regen. 2003-04-24 20:50:57 +00:00
jhb
4d35246c8d Fix the thr_create() entry by adding a trailing \. Also, sync up the
MP safe flag for thr_* with the main table.
2003-04-24 20:49:46 +00:00
jhb
146e8aecec - Replace inline implementations of sigprocmask() with calls to
kern_sigprocmask() in the various binary compatibility emulators.
- Replace calls to sigsuspend(), sigaltstack(), sigaction(), and
  sigprocmask() that used the stackgap with calls to the corresponding
  kern_sig*() functions instead without using the stackgap.
2003-04-22 18:23:49 +00:00