Merge svn+ssh://svn.freebsd.org/base/head@209749

Move prototypes for kern_sigtimedwait() and kern_sigprocmask() to
<sys/syscallsubr.h> where all other kern_<syscall> prototypes live.

In the ia32_{get,set}_fpcontext(), use fpu{get,set}userregs instead
of fpu{get,set}regs.

Noted by: bde
MFC after: 1 month

Remove two obsoleted comments, add a note about 32bit compatibility.

MFC after: 1 month

Merge svn+ssh://svn.freebsd.org/base/head@207793

Update to current version of head.

MFC r206992:
As was done in r155238 for i386 and in r155239 for amd64, clear the carry
flag for ia32 binary executed on amd64 host in get_mcontext().

As was done in r155238 for i386 and in r155239 for amd64, clear the carry
flag for ia32 binary executed on amd64 host in get_mcontext().

PR: kern/92110 (one more time)
Reported by: stas
MFC after: 1

As was done in r155238 for i386 and in r155239 for amd64, clear the carry
flag for ia32 binary executed on amd64 host in get_mcontext().

PR: kern/92110 (one more time)
Reported by: stas
MFC after: 1 week

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MFC r206553:
Change printf() calls to uprintf() for sigreturn() and trap() complaints
about inacessible or wrong mcontext, and for dreaded "kernel trap with
interrupts disabled" situation. The later

MFC r206553:
Change printf() calls to uprintf() for sigreturn() and trap() complaints
about inacessible or wrong mcontext, and for dreaded "kernel trap with
interrupts disabled" situation. The later is changed when trap is
generated from user mode (shall never be ?).

Normalize the messages to include both pid and thread name.

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Merge svn+ssh://svn.freebsd.org/base/head@206571

Change printf() calls to uprintf() for sigreturn() and trap() complaints
about inacessible or wrong mcontext, and for dreaded "kernel trap with
interrupts disabled" situation. The later is changed wh

Change printf() calls to uprintf() for sigreturn() and trap() complaints
about inacessible or wrong mcontext, and for dreaded "kernel trap with
interrupts disabled" situation. The later is changed when trap is
generated from user mode (shall never be ?).

Normalize the messages to include both pid and thread name.

MFC after: 1 week

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Merge svn+ssh://svn.freebsd.org/base/head@205807

Change the arguments of exec_setregs() so that it receives a pointer
to the image_params struct instead of several members of that struct
individually. This makes it easier to expand its arguments in

Change the arguments of exec_setregs() so that it receives a pointer
to the image_params struct instead of several members of that struct
individually. This makes it easier to expand its arguments in the future
without touching all platforms.

Reviewed by: jhb

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IFH@204581

MFC r198507:
Use kern_sigprocmask() instead of direct manipulation of td_sigmask to
reschedule newly blocked signals.

MFC r198590:
Trapsignal() calls kern_sigprocmask() when delivering catched signa

MFC r198507:
Use kern_sigprocmask() instead of direct manipulation of td_sigmask to
reschedule newly blocked signals.

MFC r198590:
Trapsignal() calls kern_sigprocmask() when delivering catched signal
with proc lock held.

MFC r198670:
For trapsignal() and postsig(), kern_sigprocmask() is called with
both process lock and curproc->p_sigacts->ps_mtx locked. Prevent lock
recursion on ps_mtx in reschedule_signals().

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MFC @199204

In r197963, a race with thread being selected for signal delivery
while in kernel mode, and later changing signal mask to block the
signal, was fixed for sigprocmask(2) and ptread_exit(3). The same r

In r197963, a race with thread being selected for signal delivery
while in kernel mode, and later changing signal mask to block the
signal, was fixed for sigprocmask(2) and ptread_exit(3). The same race
exists for sigreturn(2), setcontext(2) and swapcontext(2) syscalls.

Use kern_sigprocmask() instead of direct manipulation of td_sigmask to
reschedule newly blocked signals, closing the race.

Reviewed by: davidxu
Tested by: pho
MFC after: 1 month

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Merge from head

Merge from head up to r188941 (last revision before the USB stack switch)

- MFC @196061

Restore the segment registers and segment base MSRs for amd64 syscall
return path only when neither thread was context switched while
executing syscall code nor syscall explicitely modified LDT or MS

Restore the segment registers and segment base MSRs for amd64 syscall
return path only when neither thread was context switched while
executing syscall code nor syscall explicitely modified LDT or MSRs.

Save segment registers in trap handlers before interrupts are enabled,
to not allow context switches to happen before registers are saved.
Use separated byte in pcb for indication of fast/full return, since
pcb_flags are not synchronized with context switches.

The change puts back syscall microbenchmark numbers that were slowed
down after commit of the support for LDT on amd64.

Reviewed by: jeff
Tested (and tested, and tested ...) by: pho
Approved by: re (kensmith)

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- Merge from HEAD

Save and restore segment registers on amd64 when entering and leaving
the kernel on amd64. Fill and read segment registers for mcontext and
signals. Handle traps caused by restoration of the
invalida

Save and restore segment registers on amd64 when entering and leaving
the kernel on amd64. Fill and read segment registers for mcontext and
signals. Handle traps caused by restoration of the
invalidated selectors.

Implement user-mode creation and manipulation of the process-specific
LDT descriptors for amd64, see sysarch(2).

Implement support for TSS i/o port access permission bitmap for amd64.

Context-switch LDT and TSS. Do not save and restore segment registers on
the context switch, that is handled by kernel enter/leave trampolines
now. Remove segment restore code from the signal trampolines for
freebsd/amd64, freebsd/ia32 and linux/i386 for the same reason.

Implement amd64-specific compat shims for sysarch.

Linuxolator (temporary ?) switched to use gsbase for thread_area pointer.

TODO:
Currently, gdb is not adapted to show segment registers from struct reg.
Also, no machine-depended ptrace command is added to set segment
registers for debugged process.

In collaboration with: pho
Discussed with: peter
Reviewed by: jhb
Linuxolator tested by: dchagin

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Update the projects tree to a newer FreeBSD current.

A better fix for handling different FPU initial control words for different
ABIs:
- Store the FPU initial control word in the pcb for each thread.
- When first using the FPU, load the initial control

A better fix for handling different FPU initial control words for different
ABIs:
- Store the FPU initial control word in the pcb for each thread.
- When first using the FPU, load the initial control word after restoring
the clean state if it is not the standard control word.
- Provide a correct control word for Linux/i386 binaries under
FreeBSD/amd64.
- Adjust the control word returned for fpugetregs()/npxgetregs() when a
thread hasn't used the FPU yet to reflect the real initial control
word for the current ABI.
- The Linux/i386 ABI for FreeBSD/i386 now properly sets the right control
word instead of trashing whatever the current state of the FPU is.

Reviewed by: bde

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