CVS log for src/external/cddl/osnet/dist/lib/libdtrace/common/dt_open.c

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Keyword substitution: kv
Default branch: MAIN

Mostly merge changes from HEAD upto 20200411

Merge changes from current as of 20200406

Pull up following revision(s) (requested by riastradh in ticket #701):

	external/cddl/osnet/dev/dtrace/aarch64/dtrace_isa.c: revision 1.2
	external/cddl/osnet/dist/lib/libdtrace/common/dt_open.c: revision 1.17
	external/cddl/osnet/dist/lib/libdtrace/common/dt_module.c: revision 1.18
	sys/modules/cyclic/Makefile: revision 1.5
	external/cddl/osnet/dev/dtrace/aarch64/dtrace_subr.c: revision 1.2
	external/cddl/osnet/dev/dtrace/aarch64/dtrace_subr.c: revision 1.3
	sys/arch/aarch64/aarch64/vectors.S: revision 1.10
	external/cddl/osnet/dev/fbt/aarch64/fbt_isa.c: revision 1.2
	external/cddl/osnet/dev/fbt/aarch64/fbt_isa.c: revision 1.3
	external/cddl/osnet/dev/fbt/aarch64/fbt_isa.c: revision 1.4
	external/cddl/osnet/dev/fbt/aarch64/fbt_isa.c: revision 1.5
	external/cddl/osnet/dev/fbt/aarch64/fbt_isa.c: revision 1.6
	sys/arch/aarch64/include/cpu.h: revision 1.20
	external/cddl/osnet/dist/lib/libdtrace/common/dt_impl.h: revision 1.9

Create a buffer space of 512 bytes before the trapframe.

dtrace fbt needs enough space to emulate an

        stp     x29, x30, [sp,#-FRAMESIZE]!

instruction in a function prologue.  In the aarch64 instruction
encoding, FRAMESIZE can be as large as 512 bytes, so reserve this
much space when KDTRACE_HOOKS is enabled.

Use db_write_bytes to overwrite kernel text.

Tidy up a bit.  No functional change intended.

aarch64 fbt_invop doesn't actually use the argument, but it would
make more sense for it to be the return value and/or first argument
register.  Certainly it's not `eax'!

Tidy up a bit: don't set things we won't use; assert nonzeroness.

Use /dev/ksyms, not /netbsd, for the running kernel's symbols.

Teach dtrace about el1_trap_exit frames on aarch64.

Implement dtrace_getarg and dtrace_getreg while here.

Count the number of artificial frames in aarch64 fbt probe correctly.

Change the address ranges that aarch64 considers toxic for dtrace.
`Toxic' means dtrace forbids D scripts from even attempting to read
or write at them.

Previously we considered [0, VM_MIN_KERNEL_ADDRESS) toxic, but
VM_MIN_KERNEL_ADDRESS is only the minimum address of the kernel map;
the direct-mapped region lies below it, and with PMAP_MAP_POOLPAGE we
allocate virtual pages for pool backing directly from physical pages
through the direct-mapped region.  Also, this did not consider I/O
mappings to be toxic, which they probably should be.

Instead, treat:

[0, AARCH64_KSEG_START)
and
[VM_KERNEL_IO_ADDRESS, 0xfff...ff)

as toxic.  (The upper bound for 0xfff...ff ought to be inclusive, not
exclusive, but I think we'll need another mechanism for expressing
that to dtrace!)

Switch from db_write_bytes to using direct-mapping.

This way there's no dependency on ddb.

Define the MULTIPROCESSOR cpu_number() for modules too.
Modules should work whether the main kernel is multiprocessor or not.
In particular, dtrace should not think cpu_number() is 0 while
cpu_index(curcpu()) and curcpu()->ci_index are nonzero, leading to
rather spectacularly bogus results...

cyclic.kmod needs -Wno-sign-compare for aarch64 CPU_INFO_FOREACH.
Provisional workaround; feel free to fix.

Use /dev/ksyms, not /netbsd, for the running kernel's symbols.

Handle automatic module loading on device open more like FreeBSD does.

Where FreeBSD uses a module "dtraceall" that depends on all dtrace
modules we now load the basic set "dtrace sdt fbt syscall" on open.

Always use "netbsd" as kernel name, dt_module_update() already takes
care to load data from the booted kernel image.

Try to load module "dtrace" before opening "/dev/dtrace/dtrace".

Fixes PR kern/54387: DTrace Kernel module does not autoload on first use ...

Sync with HEAD

merge a new version of the CDDL dtrace and ZFS code.
this changes the upstream vendor from OpenSolaris to FreeBSD,
and this version is based on FreeBSD svn r315983.

in addition to the 10 years of improvements from upstream,
this version also has these NetBSD-specific enhancements:
 - dtrace FBT probes can now be placed in kernel modules.
 - ZFS now supports mmap().

import new CDDL dtrace and ZFS code from FreeBSD svn r315983.

remove incorrect comment

Introduce dt_bootfile() and use it to avoid hard-coded kernel values. Fixes
dtrace hang for kernels not named netbsd.

Make the default CPP path a list and check if they are access(2)able.
If no match is found, fallback to looking for cpp in PATH.

Adapt getmajor and getminor signatures for NetBSD.

Adjust for NetBSD.

Add definitions for uid_t and gid_t for NetBSD because we are screwing up
with the names in the kernel and the ctf sections end up having only __uid_t
and __gid_t.

sync with FreeBSD

check and fix printf formats, negative array indices, uninitialized variables,
shadowed variables.

DTrace: fix the curthread and mutex data types.

Apply NetBSD changes to DTrace.

Ok with core@.

Add the FreeBSD 8-RC1 changes for DTrace.

Ok with core@.

Import the rest of Opensolaris 20081117 needed for DTrace. No conflicts
with ZFS.

Initial revision