Add a first test for triggering a core dump in the debugged process
(via PT_DUMPCORE) and verifying it. The test finds procinfo note
and checks its contents.
The core dump is processed through libelf. However, it only provides
for finding all note segments (or sections?). I had to implement
finding and processing individual notes myself. I've added
a core_find_note() function that will be reused in future tests.
Reviewed by kamil.
Introduce two new ptrace() requests: PT_GETXSTATE and PT_SETXSTATE,
that provide access to the extended (and extensible) set of FPU
registers on amd64 and i386. At the moment, this covers AVX (YMM)
and AVX-512 (ZMM, opmask) registers. It can be easily extended
to cover further register types without breaking backwards
compatibility.
PT_GETXSTATE issues the XSAVE instruction with all kernel-supported
extended components enabled. The data is copied into 'struct xstate'
(which -- unlike the XSAVE area itself -- has stable format
and offsets).
PT_SETXSTATE issues the XRSTOR instruction to restore the register
values from user-provided 'struct xstate'. The function replaces only
the specific XSAVE components that are listed in 'xs_rfbm' field,
making it possible to issue partial updates.
Both syscalls take a 'struct iovec' pointer rather than a direct
argument. This requires the caller to explicitly specify the buffer
size. As a result, existing code will continue to work correctly
when the structure is extended (performing partial reads/updates).
mknod with mode & S_IFIFO and dev=0 shall behave like mkfifo.
Update the documentation to reflect this state.
Add ATF tests.
This is an in-kernel implementation as typically user-space programs use
mkfifo(2) directly, however whenever there is need to bypass libc (like in
valgrind) then portable POSIX software calls the mknod syscall.
Noted on tech-kern@ by Greg Troxel.
KERN_PROC_CWD in sysctl(3)
That is kern.proc.$$.KERN_PROC_CWD (I think - not that it matters here)
The effect is that -lrump now requires -lrumpvfs
This set of changes fixes (I believe) regular dynamic builds,
more might be required for static builds (will be verified soon).
binary80 arithmetic and never rounded to binary32 at the end, so it
appeared farther from the correctly rounded result in binary32 than expected.
Force binary32 using volatile float.
PR lib/54232: lib/libm/t_cos:cosf_angles regression on i386
From Riastradh.
Add tests:
- user_va0_disable_pt_continue
- user_va0_disable_pt_syscall
- user_va0_disable_pt_detach
Assert that setting PC to 0x0 in PT_CONTINUE/PT_SYSCALL/PT_DETACH for
vm.user_va0_disable==0 is disallowed.
Provide three ranges in the conf space: <libnvmm:0-100>, <MI:100-200> and
<MD:200-...>. Remove nvmm_callbacks_register(), and replace it by the conf
op NVMM_MACH_CONF_CALLBACKS, handled by libnvmm. The callbacks are now
per-machine, and the emulators should now do:
- nvmm_callbacks_register(&cbs);
+ nvmm_machine_configure(&mach, NVMM_MACH_CONF_CALLBACKS, &cbs);
This provides more granularity, for example if the process runs two VMs
and wants different callbacks for each.
Reintroduce the test for reading i386 general-purpose register values
from the debugged program. This time it's split into one test for the six
registers not normally used by the compiler (eax..edx, esi, edi), and another
for ebp, esp. This leaves enough free registers for the latter to work
without MMX.
Add new tests verifying that PT_GETREGS provides correct register values
from the underlying program. The test uses inline assembly in the child program
to set registers to well-known constants, then compares the results obtained
via PT_GETREGS against them.
Reviewed by kamil.
Rename trace_thrad[1234] to more meaningful names:
- trace_thread_nolwpevents
- trace_thread_lwpexit
- trace_thread_lwpcreate
- trace_thread_lwpcreate_and_exit
In my local tests LWP CREATE events work as expected.
LWP EXIT ones are still racy and keep them disabled racy.
PR kern/51995
The F spec is one of those, it should be terminated with \0 just like all
the others (irrelevant that it has no extra data to delimit).
Fix <sys/mman.h> to define the snprintb() format string correctly (include
the missing \0's). Fix the copy of that definition included into
snprintb(3) to match the updated mman.h version (ride the date bump
from the day before yesterday .. this is the same change, just corrected).
Undo the previous snprintb.c change ("off by one" fix) which was an
attempt to make the broken mman.h usage work (and did, but not the way
it should be done). Also, after using the new * format (instead of only
when something has already matched) skip the associated data so we don't
attempt to interpret it as more field specifiers. This func needs lots of TLC!
Fix the ATF tests for snprintb() to not assume that F format is really
exactly like f format, and has data after the field specifier. It doesn't.
Add several more tests (including testing the '*' field operator
recently added).
