Now that clock_t is an unsigned value, we can also allow the system
uptime to wrap. Essentially, instead of using (a <= b) to see if time
a occurs no later than time b, we use (b - a <= CLOCK_MAX / 2). The
latter value does not exist, so instead we add TMRDIFF_MAX for that
purpose.
We must therefore also avoid using values like 0 and LONG_MAX as
special values for absolute times. This patch extends the libtimers
interface so that it no longer uses 0 to indicate "no timeout".
Similarly, TMR_NEVER is now used as special value only when
otherwise a relative time difference would be used. A minix_timer
structure is now considered in use when it has a watchdog function set,
rather than when the absolute expiry time is not TMR_NEVER. A few new
macros in <minix/timers.h> help with timer comparison and obtaining
properties from a minix_timer structure.
This patch also eliminates the union of timer arguments, instead using
the only union element that is only used (the integer). This prevents
potential problems with e.g. live update. The watchdog function
prototype is changed to pass in the argument value rather than a
pointer to the timer structure, since obtaining the argument value was
the only current use of the timer structure anyway. The result is a
somewhat friendlier timers API.
The VFS select code required a few more invasive changes to restrict
the timer value to the new maximum, effectively matching the timer
code in PM. As a side effect, select(2) has been changed to reject
invalid timeout values. That required a change to the test set, which
relied on the previous, erroneous behavior.
Finally, while we're rewriting significant chunks of the timer code
anyway, also covert it to KNF and add a few more explanatory comments.
Change-Id: Id43165c3fbb140b32b90be2cca7f68dd646ea72e
For a reason currently unknown to us, the qemu-linaro emulator
sometimes produces a Prefetch Abort exception with a fault location
(IFAR) rather different from the location of the instruction being
executed (LR corrected by 4). So far it has been observed in the
__udivmodsi4 routine of various processes, where the fault address is
for the first byte of the next page after the current instruction,
which itself is 44-64 bytes away from the start of that next page.
The affected instruction does not perform any sort of memory access.
Short of debugging qemu-linaro itself, we have no choice but to
disable the assert that previously went off in case the IFAR and
corrected LR are not equal. Since we have not yet observed this case
on actual hardware, the kernel prints a warning when detecting such a
mismatch for the first time. For the qemu-linaro case, the kernel's
actual page fault handling logic already handles this strange case
just fine.
Change-Id: Ibd19e624149ab4e68bfe75b918ec1554b825a431
Apply the x86 overflow check from git-d09f72c to ARM code as well.
Not just stack traces, but also system services can trigger this
case, possibly as a result of being handed bad pointers by userland,
ending in a kernel panic.
Change-Id: Ib817e8b682fafec8edb486a094319ad11eda7081
Changed all K&R style functions to ANSI-style declarations within the
kernel directory. The code compiles and aparently works for i386. For
arm my toolchain does not work, but I have changed the code with great
care. Also, the make command fails for the test suite. Therefore, I
strongly recommand to review the code with care.
Edited by David van Moolenbroek to convert really all K&R functions.
Change-Id: I58cde797d36f4caa9c72db4e4dc27d8545ab8866
This functionality is required for BSD top(1), as exposed through
the CTL_KERN KERN_CP_TIME sysctl(2) call. The idea is that the
overall time spent in the system is divided into five categories.
While NetBSD uses a separate category for the kernel ("system") and
interrupts, we redefine "system" to mean userspace system services
and "interrupts" to mean time spent in the kernel, thereby providing
the same categories as MINIX3's own top(1), while adding the "nice"
category which, like on NetBSD, is used for time spent by processes
with a priority lowered by the system administrator.
Change-Id: I2114148d1e07d9635055ceca7b163f337c53c43a
This brings our tree to NetBSD 7.0, as found on -current on the
10-10-2015.
This updates:
- LLVM to 3.6.1
- GCC to GCC 5.1
- Replace minix/commands/zdump with usr.bin/zdump
- external/bsd/libelf has moved to /external/bsd/elftoolchain/
- Import ctwm
- Drop sprintf from libminc
Change-Id: I149836ac18e9326be9353958bab9b266efb056f0
Currently, the userland ABI uses a single field ('user_sp') far
into the very large 'kinfo' structure on the shared kernel
information page. This precludes us from modifying or getting
rid of 'kinfo' in the future without breaking userland. This
patch adds a separate 'kuserinfo' structure to the kernel
information page, with only information that is part of the
userland ABI, in an extensible manner. Userland now uses this
field if it is present, and falls back to the old field if not.
Change-Id: Ib7b24b53a440f40a2edc28cdfa48447ac2179288
This change serves to reduce the clutter inside the top-level kerninfo
structure, and allows other ARM-specific values to be added on the
kernel page in one place.
Change-Id: I36a6aada9dbd1230b25014728be675d389088667
Please note that this information is for use by system services only!
The clock facility is not ready to be used directly by userland, and
thus, this kernel page extension is NOT part of the userland ABI.
For service programmers' convenience, change the prototype of the
getticks(3) to return the uptime clock value directly, since the call
can no longer fail.
Correct the sys_times(2) reply message to use the right field type
for the boot time.
Restructure the kernel internals a bit so as to have all the clock
stuff closer together.
Change-Id: Ifc050b7bd253aecbe46e3bd7d7cc75bd86e45555
. make arch-independent, and local to proc.c, reduce code duplication
. make vm_suspend public but unduplicated in proc.c
. ask VM for handling once, 2nd time SIGSEGV process
. remove debug printfs
. test case for bogus sendrec() address argument
Change-Id: I3893758910c01de60b8fe3e50edd594296a0b73e
Add support for compact address layout. This feature can be enabled
through the ac_layout=1 boot option.
Change-Id: Ie20b808fce32b5c54d0a7e7210e0084a540e9613
. bitcode fixes
. switch to compiler-rt instead of netbsd libc functions
or libgcc for support functions for both x86 and arm
. minor build fixes
. allow build with llvm without crossbuilding llvm itself
. can now build minix/arm using llvm and eabi - without C++
support for now (hence crossbuilding llvm itself is turned off
for minix/arm)
Change-Id: If5c44ef766f5b4fc4394d4586ecc289927a0d6eb
