jhb [Wed, 14 Dec 2016 00:18:12 +0000 (00:18 +0000)]
Use casts to force an unsigned comparison in db_search_symbol().
On all of our platforms, db_expr_t is a signed integer while
db_addr_t is an unsigned integer value. db_search_symbol used variables
of type db_expr_t to hold the current offset of the requested address from
the "best" symbol found so far. This value was initialized to '~0'.
When a new symbol is found from a symbol table, the associated diff for the
new symbol is compared against the existing value as 'if (newdiff < diff)'
to determine if the new symbol had a smaller diff and was thus a closer
match.
On 64-bit MIPS, the '~0' was treated as a negative value (-1). A lookup
that found a perfect match of an address against a symbol returned a diff
of 0. However, in signed comparisons, 0 is not less than -1. As a result,
DDB on 64-bit MIPS never resolved any addresses to symbols. Workaround
this by using casts to force an unsigned comparison.
Probably the diff returned from db_search_symbol() and X_db_search_symbol()
should be changed to a db_addr_t instead of a db_expr_t as it is an
unsigned value (and is an offset of an address, so should fit in the same
size as an address).
jhb [Tue, 13 Dec 2016 22:30:48 +0000 (22:30 +0000)]
Fix stack traces in DDB for the debugger thread.
When the kernel debugger is entered, makectx() is called to store
appropriate state from the trapframe for the debugger into a global
kdb_pcb used as the thread context of the thread entering the
debugger. Stack unwinders for DDB called via db_trace_thread() are
supposed to then use this saved context so that the stack trace for
the current thread starts at the location of the event that triggered
debugger entry.
MIPS was instead starting the stack trace of the current thread from
the context of db_trace_thread itself and unwinding back out through
the debugger to the original frame. Fix a couple of things to bring
MIPS inline with other platforms:
- Fix makectx() to store the PC, SP, and RA in the right portion of
the PCB used by db_trace_thread().
- Fix db_trace_thread() to always use kdb_thr_ctx() (and thus kdb_pcb
for the debugger thread).
- Move the logic for tracing curthread from within the current
function into db_trace_self() to match other architectures.
cem [Tue, 13 Dec 2016 19:58:21 +0000 (19:58 +0000)]
linuxkpi: Fix not-found case of linux_pci_find_irq_dev
Linux list_for_each_entry() does not neccessarily end with the iterator
NULL (it may be an offset from NULL if the list member is not the first
element of the member struct).
jhb [Tue, 13 Dec 2016 19:36:05 +0000 (19:36 +0000)]
Use register_t instead of uintptr_t for register values in backtraces.
This fixes backtraces from DDB in n32 kernels as uintptr_t is only a
uint32_t. In particular, the upper 32-bits of each register value were
treated as the register's value breaking both the output of register
values, but also the values of 'ra' and 'sp' required to walk up to the
previous frame.
mizhka [Tue, 13 Dec 2016 09:53:43 +0000 (09:53 +0000)]
[spi] reformat message and ar5315_spi minor fix
This commit corrects print of nomatch (newline was too early) and fix
unit number for new child in ar5315_spi (was 0, now is -1 to calculate it
according to actual system state)
ed [Tue, 13 Dec 2016 07:58:30 +0000 (07:58 +0000)]
Remove the only user of sysctl_add_oid().
My plan is to change this function's prototype at some point in the
future to add a new label argument, which can be used to export all of
sysctl as metrics that can be scraped by Prometheus. Switch over this
caller to use the macro wrapper counterpart.
cperciva [Tue, 13 Dec 2016 06:54:13 +0000 (06:54 +0000)]
Check that blkfront devices have a non-zero number of sectors and a
non-zero sector size. Such a device would be a virtual disk of zero
bytes; clearly not useful, and not something we should try to attach.
As a fortuitous side effect, checking that these values are non-zero
here results in them not *becoming* zero later on the function. This
odd behaviour began with r309124 (clang 3.9.0) but is challenging to
debug; making any changes to this function whatsoever seems to affect
the llvm optimizer behaviour enough to make the unexpected zeroing of
the sector_size variable cease.
PR: 215209
Security: The potential for variables to unexpectedly become zero
has worrying consequences for security in general, but
not so much in this particular context.
gonzo [Tue, 13 Dec 2016 05:09:49 +0000 (05:09 +0000)]
[iMX6] Add compatibility string for GPT timer on i.MX6 Dual
Up until r295436 GPT timer in i.MX6 Dual dts used the same compatiblity
string as i.MX6 Quad. After the sync up with Linux in r295436, GPT timer
stopped getting attached on the i.MX6 Dual
dteske [Tue, 13 Dec 2016 00:02:59 +0000 (00:02 +0000)]
Use the oft-neglected awk syntax "startcondition, stopcondition { ... }" to
process the range of country labels which appear as columnar list from the
"ifconfig DEV list countries" command. Not only improving maintainability,
but also properly encapsulating arguments in single-quotes instead of
trying to escape whitespace. It is also completely unnecessary to collapse
newlines into whitespace (shell will do this for you automatically upon
expansion of the contents where necessary).
NB: This also changes the sorting algorithm to sort on the country code,
not the country name. The type-ahead feature of dialog is destroyed if the
tags are not sorted properly.
pfg [Mon, 12 Dec 2016 20:25:59 +0000 (20:25 +0000)]
ed(1): Simplify some checks.
The return type for both fread(3) and fwrite(3) cannot be negative, this
renders some checks invalid and variable 'ct' unnecessary.
Also bump 'len' to size_t to avoid signed/unsigned comparison warnings.
hrs [Mon, 12 Dec 2016 19:33:40 +0000 (19:33 +0000)]
- Refactor listening socket list. All of the listening sockets are
now maintained in a single linked-list in a transport-independent manner.
- Use queue.h for linked-list structure.
- Use linked-list for AllowedPeers.
- Use getaddrinfo(8) even for Unix Domain sockets.
- Use macros to type-casting from/to struct sockaddr{,_in,_in6}.
- Define fu_* macro for union f_un to shorten the member names.
- Remove an extra #include <sys/type.h>.
- Add "static" to non-exported symbols.
- !INET support is still incomplete but will be fixed later.
There is no functional change except for some minor debug messages.
trasz [Mon, 12 Dec 2016 19:11:04 +0000 (19:11 +0000)]
Undo r309891. Konstantin is right in that this condition normally
cannot happen - the um_dev field is assigned at mount and never written
to afterwards.
hrs [Mon, 12 Dec 2016 19:10:14 +0000 (19:10 +0000)]
- Refactor listening socket list. All of the listening sockets are
now maintained in a single linked-list in a transport-independent manner.
- Use queue.h for linked-list structure.
- Use linked-list for AllowedPeers.
- Use getaddrinfo(8) even for Unix Domain sockets.
- Use macros to type-casting from/to struct sockaddr{,_in,_in6}.
- Define fu_* macro for union f_un to shorten the member names.
- Remove an extra #include <sys/type.h>.
- Add "static" to non-exported symbols.
- !INET support is still incomplete but will be fixed later.
There is no functional change except for some minor debug messages.