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68fd3b0ef5
freebsd-nq/sys/amd64/include
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John Baldwin 68fd3b0ef5 Use a dedicated per-CPU stack for machine check exceptions. 
Similar to NMIs, machine check exceptions can fire at any time and are
not masked by IF.  This means that machine checks can fire when the
kstack is too deep to hold a trap frame, or at critical sections in
trap handlers when a user %gs is used with a kernel %cs.  Use the same
strategy used for NMIs of using a dedicated per-CPU stack configured
in IST 3.  Store the CPU's pcpu pointer at the stop of the stack so
that the machine check handler can reliably find the proper value for
%gs (also borrowed from NMIs).

This should also fix a similar issue with PTI with a MC# occurring
while the CPU is executing on the trampoline stack.

While here, bypass trap() entirely and just call mca_intr().  This
avoids a bogus call to kdb_reenter() (there's no reason to try to
reenter kdb if a MC# is raised).

Reviewed by:	kib
Tested by:	avg (on AMD without PTI)
Differential Revision:	https://reviews.freebsd.org/D13962
2018-01-18 23:50:21 +00:00
..
pc sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
xen x86/xen: Consolidate xen-os.h in a single place 2015-10-21 10:04:35 +00:00
_align.h
_bus.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
_inttypes.h
_limits.h
_stdint.h
_types.h
acpica_machdep.h
apm_bios.h
asm.h Remove lint support from system headers and MD x86 headers. 2017-11-23 11:40:16 +00:00
asmacros.h Fix compilation with gas. 2018-01-18 11:19:58 +00:00
atomic.h Add atomic_load(9) and atomic_store(9) operations. 2017-12-19 09:59:20 +00:00
bus_dma.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
bus.h
clock.h
counter.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
cpu.h Move the kernphys declaration to machine/md_var.h. 2018-01-18 15:15:35 +00:00
cpufunc.h Add STAC and CLAC instructions wrappers. 2018-01-14 12:39:50 +00:00
cputypes.h Remove 'cpu' and 'cpu_class' on amd64. 2016-09-15 17:05:54 +00:00
db_machdep.h Fix printing of negative offsets (typically from frame pointers) again. 2017-03-26 18:46:35 +00:00
dump.h
efi.h Hide kernel stuff from userspace. 2017-10-02 08:37:43 +00:00
elf.h
endian.h
exec.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
fdt.h
float.h
floatingpoint.h spdx: initial adoption of licensing ID tags. 2017-11-18 14:26:50 +00:00
fpu.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
frame.h PTI for amd64. 2018-01-17 11:44:21 +00:00
gdb_machdep.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
ieeefp.h spdx: initial adoption of licensing ID tags. 2017-11-18 14:26:50 +00:00
in_cksum.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
intr_machdep.h Use a dedicated per-CPU stack for machine check exceptions. 2018-01-18 23:50:21 +00:00
iodev.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
kdb.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
limits.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
md_var.h Move the kernphys declaration to machine/md_var.h. 2018-01-18 15:15:35 +00:00
memdev.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
metadata.h Move amd64 metadata.h to x86 and share with i386 2016-01-07 19:47:26 +00:00
minidump.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
mp_watchdog.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
nexusvar.h
npx.h
ofw_machdep.h
param.h spdx: initial adoption of licensing ID tags. 2017-11-18 14:26:50 +00:00
pcb.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
pci_cfgreg.h
pcpu.h PTI for amd64. 2018-01-17 11:44:21 +00:00
pmap.h PTI for amd64. 2018-01-17 11:44:21 +00:00
pmc_mdep.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
ppireg.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
proc.h Amd64 user_ldt_deref() is not used outside sys_machdep.c. Mark it as 2018-01-17 11:21:03 +00:00
profile.h Remove lint support from system headers and MD x86 headers. 2017-11-23 11:40:16 +00:00
psl.h
ptrace.h
pvclock.h
reg.h
reloc.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
resource.h
runq.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
segments.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
setjmp.h
sf_buf.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
sgx.h Add support for Intel Software Guard Extensions (Intel SGX). 2017-08-16 10:38:06 +00:00
sgxreg.h Add support for Intel Software Guard Extensions (Intel SGX). 2017-08-16 10:38:06 +00:00
sigframe.h
signal.h
smp.h PTI for amd64. 2018-01-17 11:44:21 +00:00
specialreg.h
stack.h Merge stack(9) implementations for i386 and amd64 under x86/. 2015-09-11 03:24:07 +00:00
stdarg.h
sysarch.h
timerreg.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
trap.h
tss.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
ucontext.h
varargs.h spdx: initial adoption of licensing ID tags. 2017-11-18 14:26:50 +00:00
vdso.h
vm.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
vmm_dev.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
vmm_instruction_emul.h sys/amd64: further adoption of SPDX licensing ID tags. 2017-11-27 15:03:07 +00:00
vmm.h Save and restore guest debug registers. 2018-01-17 23:11:25 +00:00
vmparam.h spdx: initial adoption of licensing ID tags. 2017-11-18 14:26:50 +00:00