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freebsd-dev/sys/arm/include
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Ian Lepore b19c9dea3e Rewrite arm kernel stack unwind code to work when unwinding through modules. 
The arm kernel stack unwinder has apparently never been able to unwind when
the path of execution leads through a kernel module. There was code that
tried to handle modules by looking for the unwind data in them, but it did
so by trying to find symbols which have never existed in arm kernel
modules. That caused the unwind code to panic, and because part of panic
handling calls into the unwind code, that just created a recursion loop.

Locating the unwind data in a loaded module requires accessing the Elf
section headers to find the SHT_ARM_EXIDX section. For preloaded modules
those headers are present in a metadata blob. For dynamically loaded
modules, the headers are present only while the loading is in progress; the
memory is freed once the module is ready to use. For that reason, there is
new code in kern/link_elf.c, wrapped in #ifdef __arm__, to extract the
unwind info while the headers are loaded. The values are saved into new
fields in the linker_file structure which are also conditional on __arm__.

In arm/unwind.c there is new code to locally cache the per-module info
needed to find the unwind tables. The local cache is crafted for lockless
read access, because the unwind code often needs to run in context where
sleeping is not allowed.  A large comment block describes the local cache
list, so I won't repeat it all here.
2019-12-15 21:16:35 +00:00
..
_align.h spdx: initial adoption of licensing ID tags. 2017-11-18 14:26:50 +00:00
_bus.h Regularize my copyright notice 2019-12-04 16:56:11 +00:00
_inttypes.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
_limits.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
_stdint.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
_types.h Do not include float interfaces when using libsa. 2018-02-23 04:04:25 +00:00
acle-compat.h
armreg.h Revert r336773: it removed too much. 2018-07-27 21:25:01 +00:00
asm.h Also check if __ARM_ARCH_6KZ__ is defined when detecting when to use ARMv6 2018-07-18 09:17:37 +00:00
asmacros.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
atags.h Regularize my copyright notice 2019-12-04 16:56:11 +00:00
atomic-v4.h Add 8 and 16 bit versions of atomic_cmpset and atomic_fcmpset for arm. 2019-10-01 19:39:00 +00:00
atomic-v6.h Add 8 and 16 bit versions of atomic_cmpset and atomic_fcmpset for arm. 2019-10-01 19:39:00 +00:00
atomic.h Implement atomic_swap_xxx() for all platforms. 2018-12-10 13:38:13 +00:00
blockio.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
board.h Regularize my copyright notice 2019-12-04 16:56:11 +00:00
bus_dma.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
bus.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
clock.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
counter.h Centralize __pcpu definitions. 2019-08-29 07:25:27 +00:00
cpu-v4.h Revert r336773: it removed too much. 2018-07-27 21:25:01 +00:00
cpu-v6.h All CP15 registers are bit fields or counters, don't use signed type 2017-11-05 16:52:54 +00:00
cpu.h align use of cp15_pmccntr_get with its availability 2019-10-07 07:37:42 +00:00
cpufunc.h Implement the ffs and fls functions, and their longer counterparts, in 2019-05-28 15:47:00 +00:00
cpuinfo.h Implement mitigation for Spectre version 2 attacks on ARMv7. 2018-01-27 11:19:41 +00:00
db_machdep.h No need to force md code to define a macro that's the same as 2018-04-16 13:52:23 +00:00
debug_monitor.h
disassem.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
dump.h
efi.h
elf.h Move the fixed base for PIE loading on arm. 2018-11-04 19:11:32 +00:00
endian.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
exec.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
fdt.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
fiq.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
float.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
floatingpoint.h spdx: initial adoption of licensing ID tags. 2017-11-18 14:26:50 +00:00
frame.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
gdb_machdep.h amd64: Protect the kernel text, data, and BSS by setting the RW/NX bits 2018-03-06 14:28:37 +00:00
ieee.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
ieeefp.h
in_cksum.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
intr.h Remove checks for now unsupported CPU_* values in arm headers. 2018-08-15 13:48:59 +00:00
kdb.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
limits.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
machdep.h Declare the global kernel symbols created by ldscript.arm in arm's machdep.h, 2019-12-06 03:48:35 +00:00
md_var.h Revert r336773: it removed too much. 2018-07-27 21:25:01 +00:00
memdev.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
metadata.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
minidump.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
ofw_machdep.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
param.h spdx: initial adoption of licensing ID tags. 2017-11-18 14:26:50 +00:00
pcb.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
pcpu_aux.h Centralize __pcpu definitions. 2019-08-29 07:25:27 +00:00
pcpu.h arm: Implement cpu_est_clockrate for armv[67] 2018-07-19 11:27:11 +00:00
physmem.h Allow us to read the physmap data into our own array and use this to build 2018-05-24 15:32:49 +00:00
pl310.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
platform.h
platformvar.h Use named field's initializer when constructing <foo>_platform structure. 2019-03-19 14:32:54 +00:00
pmap_var.h
pmap-v4.h Remove the L1 and L2 xscale page defines and rename the generic macros to 2018-08-16 10:00:51 +00:00
pmap-v6.h Add support for pmap_enter(..., psind=1) to the armv6 pmap. In other words, 2018-08-08 16:55:01 +00:00
pmap.h Introduce vm_page_astate. 2019-12-10 18:14:50 +00:00
pmc_mdep.h Revert r336773: it removed too much. 2018-07-27 21:25:01 +00:00
proc.h spdx: initial adoption of licensing ID tags. 2017-11-18 14:26:50 +00:00
procctl.h amd64 KPTI: add control from procctl(2). 2019-03-16 11:44:33 +00:00
profile.h Remove two obsolete comments that reference splhigh/splx. 2019-11-21 18:49:54 +00:00
psl.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
pte-v4.h Revert r336773: it removed too much. 2018-07-27 21:25:01 +00:00
pte-v6.h Fix TEX index acquisition using L2 attributes 2017-07-27 23:14:17 +00:00
ptrace.h Add ptrace operations to fetch and store VFP registers. 2017-09-14 15:03:43 +00:00
reg.h Cleanup structures related to VFP and/or mcontext_t. 2017-03-24 11:46:49 +00:00
reloc.h spdx: initial adoption of licensing ID tags. 2017-11-18 14:26:50 +00:00
resource.h
runq.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
sc_machdep.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
setjmp.h
sf_buf.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
sigframe.h
signal.h sys: further adoption of SPDX licensing ID tags. 2017-11-20 19:43:44 +00:00
smp.h Only support INTRNG in the SMP code on arm. We already require INTRNG on 2018-07-28 07:54:21 +00:00
stack.h Rewrite arm kernel stack unwind code to work when unwinding through modules. 2019-12-15 21:16:35 +00:00
stdarg.h Introduce an architecture-agnostic <sys/_stdarg.h> to reduce 2017-12-25 20:54:00 +00:00
swi.h
sysarch.h De-pollute arm's sysarch.h. 2019-07-10 14:34:52 +00:00
sysreg.h Add the virtualisation special register definitions. 2017-12-14 13:19:43 +00:00
trap.h
ucontext.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
undefined.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
utrap.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
vdso.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
vfp.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
vm.h sys/arm: further adoption of SPDX licensing ID tags. 2017-11-27 15:04:10 +00:00
vmparam.h Define PHYS_TO_DMAP() and DMAP_TO_PHYS() as panics on the architectures 2018-01-19 22:17:13 +00:00