linux: Implement PTRACE_GETREGSET NT_PRFPREG and NT_X86_XSTATE
Implement NT_PRFPREG and NT_X86_XSTATE for PTRACE_GETREGSET on amd64.
Chrome's crashpad handler uses these to collect floating-point and
extended CPU register state for crash dumps.
Other architectures retain the previous EINVAL stub behavior.
Signed-off-by: Ricardo Branco <rbranco at suse.de>
PR: 289285
Reviewed by: kib
Pull-Request: https://github.com/freebsd/freebsd-src/pull/2165
(cherry picked from commit c515e6040614434a9262ee8b5ac54b81476ec7ff)
linux: Add linux_pt_fpregset and bsd_to_linux_fpregset() for amd64
Add struct linux_pt_fpregset, the amd64 Linux NT_PRFPREG payload,
corresponding to user_i387_struct in Linux. The struct describes
the 512-byte FXSAVE area as exposed by PTRACE_GETREGSET.
Add bsd_to_linux_fpregset() to translate from FreeBSD's struct fpreg
to struct linux_pt_fpregset. Fields are extracted from the fpr_env[]
array which stores the FXSAVE environment packed as four 64-bit words.
The FP and XMM register banks are bulk-copied as opaque byte arrays.
Signed-off-by: Ricardo Branco <rbranco at suse.de>
Reviewed by: kib
Pull-Request: https://github.com/freebsd/freebsd-src/pull/2165
(cherry picked from commit b84d31ee74535a0026ff83f2a34c07b7557f9785)
linux: Ignore sigaction(2) flags SA_UNSUPPORTED and SA_EXPOSE_TAGBITS
SA_UNSUPPORTED was introduced in Linux 5.11 to probe support
for other flags such as SA_EXPOSE_TAGBITS, introduced
at the same time. Ignore both.
Signed-off-by: Ricardo Branco <rbranco at suse.de>
PR: 289285
Reviewed by: pouria, kib
Pull-Request: https://github.com/freebsd/freebsd-src/pull/2163
(cherry picked from commit fdea83a5f63b881ade91c6cc9dfbf173137512c5)
amd64/arm64 pmap: consistently clear PGA_WRITEABLE
We don't consistently clear PGA_WRITEABLE on fictitious, managed pages.
Some functions do, e.g., pmap_remove_all(), but several do not. At
worst, this is just a pessimization, but there is no good reason to be
inconsistent. Clear PGA_WRITEABLE in those that previously did not by
introducing (and using) the helper function pmap_page_is_mapped_locked()
that implements the correct test.
(cherry picked from commit 37321270b630d891e48851f81dd6d077ebd6b635)
rtld: fix leak in get_program_var_addr() on the error path
Fixes: 1e370f038778 ("rtld: stop using unbound alloca()")
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
dl_iterate_phdr(3): do not return garbage for objects not using TLS
For objects without a TLS segment, tlsindex is zero. tls_get_addr_slow()
then reads dtv_slots[-1], which is dtv_size, and returns it as the TLS
address. Set dlpi_tls_data to NULL for such objects instead.
Fixes: d36d68161517 ("rtld dl_iterate_phdr(): dlpi_tls_data is wrong")
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
rtld: some cosmetics in donelist_init()
Add a missing word in the comment.
Make each assignment a separate statement.
Fix formatting.
Fixes: 1e370f038778 ("rtld: stop using unbound alloca()")
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
vfs_register: prevent kernel crash
vfs_register hashes the filesystem name and uses it for sysctl oids.
A filesystem name which hashes to 0 crashes in sysctl_register_oid().
Map 0 to 1 to prevent the kernel crash.
This can be tested with "udf2" as the filesystem name.
MFC after: 1 month
MFC to: stable/15 stable/14
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D59839
(cherry picked from commit 3897678132e71df70dbb18bf8e2f19124beee5d7)
vfs_register: prevent kernel crash
vfs_register hashes the filesystem name and uses it for sysctl oids.
A filesystem name which hashes to 0 crashes in sysctl_register_oid().
Map 0 to 1 to prevent the kernel crash.
This can be tested with "udf2" as the filesystem name.
MFC after: 1 month
MFC to: stable/15 stable/14
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D59839
(cherry picked from commit 3897678132e71df70dbb18bf8e2f19124beee5d7)
Merge commit 4d7292e58078 from llvm-project (by Minsoo Choo):
[libunwind] Unwind through AArch64 FreeBSD signal trampolines (#235065)
Retried from https://reviews.llvm.org/D155066.
Recognize signal trampolines using KERN_PROC_SIGTRAMP when unwind
metadata is unavailable. Restore the interrupted PC, LR, SP, general
registers, and valid floating-point registers.
Add coverage for unwinding out of an interrupted leaf function on both
regular and alternate signal stacks.
Assisted-by: GPT
MFC after: 1 week
Merge commit fd4113508a64 from llvm-project (by Minsoo Choo):
[libunwind] Support extended amd64 segment registers (#229176)
Raise the amd64 DWARF register limit to 59 and add RFLAGS, all six
segment selectors, FS.base, and GS.base to the register model. Capture
the extended state and restore it when resuming, using sigreturn() on
FreeBSD to restore selectors and bases together. Pack the state into the
existing context buffers without changing their public sizes or the
Windows XMM offsets.
Add tests for register access, signal-frame CFI recovery, register
bounds, and resume behavior.
Assisted-by: GPT
MFC after: 1 week
snd_hda: Identify AMD Audio Coprocessor
This makes the driver attach, but the device is still not usable.
Reported by: Lukasz Wencki <lukasz at smail.net.pl>
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
powerpc: keep the VSX halves of the FPRs across back-to-back signals
grab_mcontext() only put the second halves of vs0-31 into the context
while the thread owned the VSX unit, but sigreturn(2) gives ownership
up so that the next use reloads the registers lazily. A signal that
arrives right after a sigreturn, like one the handler's mask was
holding back, got a context without them and its own sigreturn then
zeroed them in the PCB.
The halves saved in the PCB are current whenever the FP state is, since
VSX instructions can't run without PCB_VSX and save_fpu() stores them
in that case, so export them together with the FP registers.
Reviewed by: jhibbits
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D60754
(cherry picked from commit 64b2fea9a2f90c2cc6097ed2d69acbfeeb13058d)
(cherry picked from commit 0e9af9fb72884e77de79e37069a162e1563ca86b)
powerpc: keep the VSX halves of the FPRs across back-to-back signals
grab_mcontext() only put the second halves of vs0-31 into the context
while the thread owned the VSX unit, but sigreturn(2) gives ownership
up so that the next use reloads the registers lazily. A signal that
arrives right after a sigreturn, like one the handler's mask was
holding back, got a context without them and its own sigreturn then
zeroed them in the PCB.
The halves saved in the PCB are current whenever the FP state is, since
VSX instructions can't run without PCB_VSX and save_fpu() stores them
in that case, so export them together with the FP registers.
Reviewed by: jhibbits
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D60754
(cherry picked from commit 64b2fea9a2f90c2cc6097ed2d69acbfeeb13058d)
