CVS log for src/sys/arch/mips/mips/db_trace.c

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Keyword substitution: kv
Default branch: MAIN

Sync with HEAD.

On MIPS use a helper function to work out the current PC and then
call stacktrace_subr() directly for displaying a stacktrace with
db_stacktrace() and friends.

Remove a macro that has never been used.

Trailing whitespace, remove extra blank line.

redo much of rev 1.45 and make the _KERNEL path look like it
used to before.

while it uses less total lines of code and looks less ugly,
the merged crash+ddb code here is less correct and harder to
follow for the kernel path.

Including <ddb/db_access.h> once should be sufficient.

mostly complete basic port of crash(8) to mips.

tested on mipsel and mips64eb.  basic functionality works
on the running kernel, not yet tested on crash dumps.

move stacktrace_subr() from trap.c into new mips_stacktrace.c so
it can be shared between ddb, other mips kernel components (see
locore), and an upcoming crash(8) port.

remove second copy of kdbpeek() (hidden by old DDB_TRACE
option, but they're functionally equivalent.)

tested on octeon.

ok simonb@

update from HEAD

Sync with HEAD

Make db_expr_t long long when using the N32 ABI.

Change db_expr_t to an register_t so we can see the full register contents
on N32 kernels.

Sync with HEAD.

sync with head

Add whitespace

Major merge to/from current.
Adds MIPS32/MIPS64 R2 support (24k, 74k, etc.) including COP0_USERLOCAL
Adds support for emulation of rdhwr $3,$29 instruction.
Major cleanup of SMP code.  (stable on multi-core / single thread per core)
llsc locking code only used in MP capable kernels.

sync with head

Sync with HEAD

Major merge forward from matt-nb5-mips64.
New fixup code.
New common SPL code.
New common interrupt code.
Move related variables into structures.
Cleanup locore (move MD variable into it).
Kill StudlyCaps
Use PCU for FPU

Sync with HEAD.

sync with head.

add "trace/a" to trace by LWP address.

sync with head

Remove pfind() and pgfind(), fix locking in various broken uses of these.
Rename real routines to proc_find() and pgrp_find(), remove PFIND_* flags
and have consistent behaviour.  Provide proc_find_raw() for special cases.
Fix memory leak in sysctl_proc_corename().

COMPAT_LINUX: rework ptrace() locking, minimise differences between
different versions per-arch.

Note: while this change adds some formal cosmetics for COMPAT_DARWIN and
COMPAT_IRIX - locking there is utterly broken (for ages).

Fixes PR/43176.

sync with head

Merge frame into trapframe.  While this costs a bit more stack space on
kernel exceptions, the resulting simplifications are worth it.  This is
a step to fast softints and kernel preemption.

trapframe now includes a struct reg instead of a separate array of registers.

Merge from matt-nb5-mips64
Merge mips-specific arch files.

Use lwp_getpcb() on mips, powerpc and sh3, clean from struct user usage.

Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code.  Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

Use the new symbolic constants for label_t.
Use label_t where appropriate.
Add some LP64 KASSERTs

Make ddb(4) trace work on 64-bit ABIs.

For now:

- Values are shown in 32-bit.
- Only 4 arguments are shown.
- DDB_TRACE (heuristic version) is left as is.


Reviewed By:	matt

Cleanup types for stacktrace_subr()

sync with HEAD

Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree.  Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches.  The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

sync with head.

Sync with head.

Sync with head.

Update to HEAD.

merge yamt-idlelwp branch.  asked by core@.  some ports still needs work.

from doc/BRANCHES:

	idle lwp, and some changes depending on it.

	1. separate context switching and thread scheduling.
	   (cf. gmcgarry_ctxsw)
	2. implement idle lwp.
	3. clean up related MD/MI interfaces.
	4. make scheduler(s) modular.

Initial changes for MIPS. Not yet working under gxemul.

- sync with head.
- move sched_changepri back to kern_synch.c as it doesn't know PPQ anymore.

sync with head.

Fix more boolean_t -> bool lossage

Replace the Mach-derived boolean_t type with the C99 bool type.  A
future commit will replace use of TRUE and FALSE with true and false.

Change the process/lwp flags seen by userland via sysctl back to the
P_*/L_* naming convention, and rename the in-kernel flags to avoid
conflict. (P_ -> PK_, L_ -> LW_ ). Add back the (now unused) LSDEAD
constant.

Restores source compatibility with pre-newlock2 tools like ps or top.

Reviewed by Andrew Doran.

Sync with head.

sync with head.

Make the DDB_TRACE variant compilable

sync with head.

sync with head

Use p_find(addr, PFIND_LOCKED) in case the proclist_lock is held.

sync with head.

No need #include <machine/param.h> since #include <sys/param.h> is enough.

merge ktrace-lwp.

Sync with HEAD. Here we go again...

Deal with extra constiness in ddb.

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD

Hide the register number constants behind an _R_ prefix, and also
rename FPBASE to _FPBASE, so that we avoid polluting the user's
name space when e.g. <sys/ptrace.h> is included.  Previously, the
PC symbol in mips/regnum.h would conflict with the declaration of
the external variable by the same name in termcap.h, as discovered
by the ``okheaders'' regression test.

__KERNEL_RCSID()

Merge the nathanw_sa branch.

Catch up to -current

Add N32 register vars.

No longer need to pull in lwp.h; proc.h pulls it in for us.

Catch up to -current.
(CVS: It's not just a program. It's an adventure!)

Catch up with -current.

ANSIfy.

Sync kqueue branch with -current.

Catch up to -current.

lwp'ify

KNF, ANSIfy.
Change print_addr() to take an db_addr_t argument instead of a long.

Catch up to -current.

file db_trace.c was added on branch nathanw_sa on 2001-12-15 07:09:12 +0000

Remove prototype for non-existant function.

Sync with HEAD.

- fix prototype of db_mips_variable_func().

make db_[e]regs[] const

Update thorpej_scsipi to -current as of a month ago
A i386 GENERIC kernel compiles without the siop, ahc and bha drivers
(will be updated later). i386 IDE/ATAPI and ncr work, as well as
sparc/esp_sbus. alpha should work as well (untested yet).
siop, ahc and bha will be updated once I've updated the branch to current
-current, as well as machine-dependant code.

Add trace/t pid support for mips.

<vm/vm_param.h> -> <uvm/uvm_param.h>

No longer need to include sys/types.h.

Include <sys/param.h> to make the new cpu.h happy.

Fix typo (stray " where it shouldn't be).

Rename the machine-specific stack trace printing functions
from db_stack_trace_cmd() to db_stack_trace_print(),
and add an additional argument, a function pointer for an
output routine (i.e. printf() or db_printf()).

Add db_stack_trace_cmd() in db_command.[ch], calling
db_stack_trace_print() with db_printf() as the printer.

Move count==-1 special handling from db_stack_trace_print() [nee
db_stack_trace_cmd()] to db_stack_trace_cmd() [nascent here].

Again, I'm unable to test compilation on all affected platforms,
so advance apologies for potential brokenness.

Nuke register, diddle a bit of indentation in some function declarations.

Don't `extern' function declarations.  While we're there, remove trailing
blank lines and white space.

Sync w/ -current.

Nuke register and remove trailling white space.

Include <machine/db_machdep.h> instead of <mips/db_machdep.h>.

- Replace the stub value of 'eret' instruction with correct one.

* Elimination of UADDR/KERNELSTACK

   Affected files:
	include/mips_param.h, include/pcb.h,
	mips/locore_mips1.S, mips/locore_mips3.S,
	mips/mips_machdep.c, mips/vm_machdep.c

   Issue:

So far, NetBSD/mips has not successfully got rid of fixed-address
kernel stack.  USPACE (two 4KB pages) of each process has two distinct
KSEG2 addresses, both refer to a single physical storage; one address
for fixed range [ UADDR .. KERNELSTACK ), and another for "normal" KSEG2
address which was allocated by kernel memory manager and unique to each
others of processes.

"Doubly mapped" USPACE complicates context switch.  Both address ranges
have to be managed with a special care of "wired" TLB entries which
are never replaced until next context switch to ensure no TLB miss for
USPACE access.  It's equally crumbersome that MIPS processor's cache
machinary gets be confused about USPACE contents because there are two
distinct KSEG2 addresses to manipulate one physical storage.

   Solution:

Purge KERNELSTACK constant for kernel stack pointer and replace
it with process unique values.  Kernel stack bottom is located at
'curproc->p_addr + USPACE'.  Context switch is simplified as it unloads
half of TLB hardwiring burden.  It just manages the unique KSEG2 address
of each USPACE to be wired.  As the side effect, switch_exit() has no
MIPS processor ISA dependent code anymore.  It switchs kernel stack to
proc0's USPACE which has KSEG0 address and no need of TLB entry.

* Extensive use of 'genassym.cf'

To hide target port dependent and/or processor register size dependent
constants from assembler routines, 'genassym.cf' now has an extentive
set of definitions for various constants and offset values of
structural objects.  This change will contribute possible NetBSD/mips64
portability too.

* Separation and rename of locore_r2000/_r4000.S

Those files are now indepedent standalones from locore.S to ease
maintainance works, and renamed to match MIPS processor ISA version.

* Changes in kernel mode exception handlers

Kernel mode exception handlers hold exception contexts by pushing a
certain set of register values on stack for resuming kernel mode
processing.  This context is now represented with 'struct trapframe',
which is smaller than full scale (user mode) exception context 'struct
frame'.  Stack consumption of kernel mode exception services is now
similar to 4.4BSD/mips.

* Relocation of exception frame

User mode context 'struct frame' is moved to the very bottom of kernel
stack at 'curproc->p_addr + USPACE - sizeof(struct frame)'  This change
saves a bit of instructions on every return to user processes as it
eliminates reference to global variable 'curpcb' each time.

* Refurblished DDB backtrace routine

It's a growing concern to maintain stacktrace() code correctly.  It
could be simplified by enforcing special arrangements for some of
obscure locore routines which violate usual coding conventions.

New backtrace code searchs for certain instructions peculiar to any of
function tails.  Specifically, "jr ra" for normal function returns, "jr
k0" for MIPS1 exception handlers and "eret" for MIPS3 handlers.

* Support for 64-bit safe user code
    Affected Files:
	${ARCH}/include/pubassym.cf lib/libc/arch/mips/gen/*setjmp*
	include/setjmp.h mips/include/[lots] mips/mips/[lots]

    Solution:

	We define macros REG_L/REG_S and SZREG for loading and storing
	registers and for the size of registers.  The exact meaning
	of these is controlled by a macro (currently _MIPS64) which
	allows one to treat the registers as either 32-bit or 64-bit.
	There are data types mips_reg_t and mips_fpreg_t which represent
	the true register sizes, and avoid confusing register_t.

	We needed a way to dynamically gen the structure sizes of things
	like sigcontext for setjmp.h, so we defined a pubassym.cf for
	libc routines like setjmp and longjmp.

	NetBSD/mips allows ${ARCH}'s to be defined which preserve
	all 64-bits of registers across user context switches.  There
	are still a few niceties to clean up for kernel mode context
	switches.

* Support for QED 52xx processors
    Affected Files:
	mips/locore_mips3.S mips/pmap.c include/locore.h

    Issue:
	The QED 52xx family of processors are targeted at low cost
	embedded systems, (i.e. CPUs ~$30) for systems like routers, printers,
	etc.  We have added preliminary support for some of the idiosyncrasies
	of this processor, e.g. no L2 cache, etc.  More work needs to be
	done here because with a modest 2-way  L1 cache, some of the rampant
	flushing has significant performance implications.  However,
	it doesn't crash, which is a start.

    Solution:
	A routine for flushing the cache based on virtual addresses was added;
	a routine which deals with the two-way set associativity of the
	5230 L1 cache was added, accomodations to 5230's instruction hazards
	were added.


* TLB Miss code for mips3/mips4 processors cleaned up significantly.
    Affected Files:
	mips/locore_mips3.S mips/vm_machdep.c include/locore.h mips_machdep.c
    Issue:
	The TLB Miss handler exceeded the allowed size, which wasn't
	a problem because there was no handler for when the processor
	was in 64-bit mode.  The handler for invalid TLB exceptions
	also appears to have much vestigial code, which made it
	difficult to understand.

    Solution:
	Use the XCONTEXT register to store a pointer to the segment
	map table, this coupled with removing some dead code allows
	the handlers to fit.

- Complete vm_offset_t purge for mips processor.
- bzero() -> memset() and bcopy() -> memcpy().
- Garbage collection in trap.c and db_interface.c.

- Step forward to MIPS64 support.  Incorporate partially Caster Fu's
patches.  Still some work is missing to satisfy his QED 5230 port.

- More symbolic definitions in genassym.cf which improve possible 64bit-ness
of locore_mips{1,3}.S.

- Fix mips3 L1 cache line size detection logic in cpuarch.h as pointed by
Caster.

- Fix a bug in proc_trampoline() code in locore_mips3.S as pointed by Caster.

- Replace vm_offset_t with vaddr_t/paddr_t entirely.  Note that
NetBSD/newsmips has purged vm_offset_t too.

- Synchronize various files according to recent changes made in main trunk.

Delete incorrect private declaration of db_maxoff.

RCSID Police.

DDB for mips.
  Add DDB interface to /sys/arch/mips/mips..
  Rework heuristic stack traceback to work with DDB.
  Add hooks  to print exception log from DDB.
  Add hooks from pmax console drivers:   call Debugger()
  after break from serial console, or 'DO' key from LK-xxx.