Ensure that all eight syscall arguments are available to dtrace_probe(),
rather than just the first five. This is done by calling dtrace_probe()
through a function pointer, as in illumos.

MFC after:

Ensure that all eight syscall arguments are available to dtrace_probe(),
rather than just the first five. This is done by calling dtrace_probe()
through a function pointer, as in illumos.

MFC after: 3 weeks

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Merge from head up to r262536.

Revert r262466, as it does not compile on PowerPC.

Reported by: jhibbits

Merge from head up to r262472.

Make all 8 syscall arguments available to syscall probes in the same way
that this is done for SDT probes. This fixes the syscall/tst.args.d test,
which was failing because mmap(2)'s sixth argument w

Make all 8 syscall arguments available to syscall probes in the same way
that this is done for SDT probes. This fixes the syscall/tst.args.d test,
which was failing because mmap(2)'s sixth argument wasn't available to the
probe.

MFC after: 2 weeks

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IFC @230489 (pending review).

IFC @ r227804

Pull in the virtio drivers from head.

Correct the types of the arguments to return probes of the syscall
provider. Previously we were erroneously supplying the argument types of
the corresponding entry probe.

Reviewed by: rpaulo
MFC af

Correct the types of the arguments to return probes of the syscall
provider. Previously we were erroneously supplying the argument types of
the corresponding entry probe.

Reviewed by: rpaulo
MFC after: 1 week

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Stripped '32' suffix from linux systrace module name on i386.

Approved by: avg

Merge svn+ssh://svn.freebsd.org/base/head@219680

add DTrace systrace support for linux32 and freebsd32 on amd64 syscalls

Add systrace_linux32 and systrace_freebsd32 modules which provide
support for tracing compat system calls in addition to nativ

add DTrace systrace support for linux32 and freebsd32 on amd64 syscalls

Add systrace_linux32 and systrace_freebsd32 modules which provide
support for tracing compat system calls in addition to native system
call tracing provided by systrace module.

Provided that all the systrace modules are loaded now you can select
what syscalls to trace in the following manner:

syscall::xxx:yyy - work on all system calls that match the specification
syscall:freebsd:xxx:yyy - only native system calls
syscall:linux32:xxx:yyy - linux32 compat system calls
syscall:freebsd32:xxx:yyy - freebsd32 compat system calls on amd64

PR: kern/152822
Submitted by: Artem Belevich <fbsdlist@src.cx>
Reviewed by: jhb (earlier version)
MFC after: 3 weeks

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Merge svn+ssh://svn.freebsd.org/base/head@214309

Merge svn+ssh://svn.freebsd.org/base/head@208557

Kernel DTrace support for:
o uregs (sson@)
o ustack (sson@)
o /dev/dtrace/helper device (needed for USDT probes)

The work done by me was:
Sponsored by: The FreeBSD Foundation

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

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

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integrate from head@185615

Merge latest DTrace changes from Perforce.

Custom DTrace kernel module files plus FreeBSD-specific DTrace providers.