The ITS is defined to be disabled on a warm reset, but we may be coming
in via another kernel/hypervisor type setup where the ITS has been
previously configured then relinquished to the next kernel in the chain.
If it's enabled, the later configuration of GITS_BASER will almost
certainly fail -- clear it to prevent that.
Reviewed by: andrew
Sponsored by: Ampere Computing
Submitted by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D34546
When using 16k or 64k pages atop will shift the address by more than
the needed amount for a tlbi instruction. Replace this with a new macro
to shift the address by 12 and use PAGE_SIZE in the for loop to let the
code work with any page size.
Reviewed by: alc, markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34516
To allow for a future 16k or 64k page size we need to tell libkvm which
is being used. Add a flag field in unused space in minidumphdr and use
it to signal between the different options.
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34548
When moving from the l1 index to l0 index we need to use the l1 shift
value not the l0 shift value. With 4k pages they are identical, however
with 16k pages we only have 2 l0 entries so the shift value is incorrect.
Reviewed by: alc, markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34517
In particular, use a generic wrapper around struct regset rather than
requiring per-regset helpers. This helper replaces the MI
__elfN(note_prstatus) and __elfN(note_fpregset) helpers. It also
removes the need to explicitly dump NT_ARM_ADDR_MASK in the arm64
__elfN(dump_thread).
Reviewed by: markj, emaste
Sponsored by: University of Cambridge, Google, Inc.
Differential Revision: https://reviews.freebsd.org/D34446
When creating the DMAP region we may need to create level 2 page table
entries at the start and end of a block of memory. The code to do this
was almost identical so we can merge into a single function.
Sponsored by: The FreeBSD Foundation
They are in a different order to the TCR_TG1 values but appear to have
been copied incorrectly.
While here use TCR_TG0_4K in locore.S to make it explicit the userspace
page size is 4K.
Sponsored by: The FreeBSD Foundation
We assume EFI_PAGE_SIZE is the same as PAGE_SIZE, however this may not
be the case. Use the former when working with a list of pages from the
UEFI firmware so the correct size is used.
This will be needed on arm64 where PAGE_SIZE could be 16k or 64k in the
future. The other architectures have been updated to be consistent.
Reviewed by: imp
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34510
We assume the pointer returned from get_pcpu will be consistent even
if the thread is moved to a new CPU. Fix this by partially reverting
63c858a04d to make get_pcpu a function again.
Sponsored by: The FreeBSD Foundation
The arm64 unknown exception will be raised when we execute an
instruction that id invalid or disabled. To help debug these print
the instruction that failed.
Sponsored by: The FreeBSD Foundation
To help with switching to a vdso sigtramp switch to passing through the
sigcode function when entering a signal. This ensures the return address
is within the function.
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33690
We need to not include the MI _san.h files when builing some parts of
the kernel. Fix these checks in the arm64 header files.
Sponsored by: The FreeBSD Foundation
This can be used by debuggers to find which bits in a virtual address
should be masked off to get a canonical address. This is currently used
by the Pointer Authentication Code support to get its mask. It could also
be used if we support Top Byte Ignore for the same purpose.
Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34302
Use the new ofw_iicbus_set_devinfo() method to implant an OFW compatibility
string for a manually created RTC sub-device.
MFC after: 4 weeks
Reported by: archimedes.gaviola_at_gmail.com
bscott_at_bunyatech.com.au
Add a static assert for the siginfo{,32}_t, mcontext{,32}_t and
ucontext{,32}_t sizes. These are de-facto ABI options and cannot change
size ever.
Reviewed by: kib, andrew, jhb
Differential Revision: https://reviews.freebsd.org/D32958
We should clear the single step flag when entering a signal hander and
set it when returning. This fixes the ptrace__PT_STEP_with_signal test.
While here add support for userspace to set the single step bit as on
x86. This can be used by userspace for self tracing.
Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34170
When debugging 32-bit programs a debugger may insert a instruction that
will raise the undefined instruction trap. The kernel handles these
by raising a SIGTRAP, however the code was incorrect.
Fix this by using the expected TRAP_BRKPT signal code.
Sponsored by: The FreeBSD Foundation
While here clean up the names for the naming convention of the other
registers in this file.
Reviewed by: kib, mhorne (earlier version)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34060
This allows entering the debugger at the earliest possible time, if
the '-d' argument is passed to the kernel.
Reviewed by: jhb
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D34120
This adds the PT_GETREGSET and PT_SETREGSET ptrace types. These can be
used to access all the registers from a specified core dump note type.
The NT_PRSTATUS and NT_FPREGSET notes are initially supported. Other
machine-dependant types are expected to be added in the future.
The ptrace addr points to a struct iovec pointing at memory to hold the
registers along with its length. On success the length in the iovec is
updated to tell userspace the actual length the kernel wrote or, if the
base address is NULL, the length the kernel would have written.
Because the data field is an int the arguments are backwards when
compared to the Linux PTRACE_GETREGSET call.
Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D19831
ASLR stack randomization will reappear in a forthcoming commit. Rather
than inserting a random gap into the stack mapping, the entire stack
mapping itself will be randomized in the same way that other mappings
are when ASLR is enabled.
No functional change intended, as the stack gap implementation is
currently disabled by default.
Reviewed by: kib
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33704
Rather than fetching the ps_strings address directly from a process'
sysentvec, use this macro. With stack address randomization the
ps_strings address is no longer fixed.
Reviewed by: kib
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33704
The size of the ps_strings structure varies between ABIs, so this is
useful for computing the address of the ps_strings structure relative to
the top of the stack when stack address randomization is enabled.
Reviewed by: kib
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33704
Missed issues in truss on at least armv7 and powerpcspe need to be
resolved before recommit.
This reverts commit 3889fb8af0.
This reverts commit 1544e0f5d1.
This more clearly differentiates system call arguments from integer
registers and return values. On current architectures it has no effect,
but on architectures where pointers are not integers (CHERI) and may
not even share registers (CHERI-MIPS) it is necessiary to differentiate
between system call arguments (syscallarg_t) and integer register values
(register_t).
Obtained from: CheriBSD
Reviewed by: imp, kib
Differential Revision: https://reviews.freebsd.org/D33780
Pointer authentication allows userspace to add instructions to insert
a Pointer Authentication Code (PAC) into a register based on an address
and modifier and check if the PAC is correct. If the check fails it will
either return an invalid address or fault to the kernel.
As many of these instructions are a NOP when disabled and in earlier
revisions of the architecture this can be used, for example, to sign
the return address before pushing it to the stack making Return-oriented
programming (ROP) attack more difficult on hardware that supports them.
The kernel manages five 128 bit signing keys: 2 instruction keys, 2 data
keys, and a generic key. The instructions then use one of these when
signing the registers. Instructions that use the first four store the
PAC in the register being signed, however the instructions that use the
generic key store the PAC in a separate register.
Currently all userspace threads share all the keys within a process
with a new set of userspace keys being generated when executing a new
process. This means a forked child will share its keys with its parent
until it calls an appropriate exec system call.
In the kernel we allow the use of one of the instruction keys, the ia
key. This will be used to sign return addresses in function calls.
Unlike userspace each kernel thread has its own randomly generated.
Thread0 has a static key as does the early code on secondary CPUs.
This should be safe as there is minimal user interaction with these
threads, however we could generate random keys when the Armv8.5
Random number generation instructions are present.
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D31261
We have 32 instructions in each exception vector on arm64. Previously
only one was used to branch to the handler function. We can split the
start of these functions and move some of the instructions into the
vectors.
Reviewed by: kib, markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33751
- Move busdma_lock_mutex to subr_bus_dma.c.
- Move _busdma_lock_dflt to subr_bus_dma.c. This function was named a
couple of different things previously. It is not a public API but
an internal helper used in place of a NULL pointer. The prototype
is in <sys/bus_dma.h> as not all backends include
<sys/bus_dma_internal.h>.
Reviewed by: kib
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D33694
Move mostly duplicated code in various MD bus_dma backends to support
bounce pages into sys/kern/subr_busdma_bounce.c. This file is
currently #include'd into the backends rather than compiled standalone
since it requires access to internal members of opaque bus_dma
structures such as bus_dmamap_t and bus_dma_tag_t.
Reviewed by: kib
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D33684
