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Jinyang He dc74a9e8a8 LoongArch: Add generic ex-handler unwind in prologue unwinder 
When exception is triggered, code flow go handle_\exception in some
cases. One of stackframe in this case as follows,

high -> +-------+
        | REGS  |  <- a pt_regs
        |       |
        |       |  <- ex trigger
        | REGS  |  <- ex pt_regs   <-+
        |       |                    |
        |       |                    |
low  -> +-------+           ->unwind-+

When unwinder unwinds to handler_\exception it cannot go on prologue
analysis. Because it is an asynchronous code flow, we should get the
next frame PC from regs->csr_era rather than regs->regs[1]. At init time
we copy the handlers to eentry and also copy them to NUMA-affine memory
named pcpu_handlers if NUMA is enabled. Thus, unwinder cannot unwind
normally. To solve this, we try to give some hints in handler_\exception
and fixup unwinders in unwind_next_frame().

Reported-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
 		2023-01-17 11:42:16 +08:00
..
.gitignore
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Makefile LoongArch: Strip guess unwinder out from prologue unwinder 2023-01-17 11:42:16 +08:00
access-helper.h LoongArch: Add exception/interrupt handling 2022-06-03 20:09:28 +08:00
acpi.c LoongArch: Add suspend (ACPI S3) support 2022-12-14 08:41:53 +08:00
alternative.c LoongArch: Use common function sign_extend64() 2023-01-17 11:42:16 +08:00
asm-offsets.c LoongArch: Add basic STACKPROTECTOR support 2022-12-14 08:41:53 +08:00
cacheinfo.c LoongArch: Refactor cache probe and flush methods 2022-10-12 16:36:14 +08:00
cpu-probe.c LoongArch: Add HWCAP_LOONGARCH_CPUCFG to elf_hwcap 2023-01-17 11:42:16 +08:00
crash_dump.c LoongArch: Add kdump support 2022-10-12 16:36:19 +08:00
dma.c LoongArch: Use acpi_arch_dma_setup() and remove ARCH_HAS_PHYS_TO_DMA 2022-09-24 18:39:21 +02:00
efi-header.S efi/loongarch: Add efistub booting support 2022-09-06 11:19:34 +02:00
efi.c LoongArch changes for v6.2 2022-12-19 08:23:27 -06:00
elf.c LoongArch: Add ELF and module support 2022-06-03 20:09:28 +08:00
entry.S LoongArch: Re-tab the assembly files 2022-07-29 18:22:32 +08:00
env.c LoongArch: Add FDT booting support from efi system table 2022-12-14 08:41:53 +08:00
fpu.S LoongArch: Consolidate __ex_table construction 2022-12-14 08:36:11 +08:00
ftrace.c LoongArch/ftrace: Add basic support 2022-12-14 08:41:53 +08:00
ftrace_dyn.c LoongArch: modules/ftrace: Initialize PLT at load time 2022-12-14 08:41:54 +08:00
genex.S LoongArch: Add generic ex-handler unwind in prologue unwinder 2023-01-17 11:42:16 +08:00
head.S efi: Put Linux specific magic number in the DOS header 2022-12-05 09:31:46 +01:00
idle.c LoongArch: Add process management 2022-06-03 20:09:28 +08:00
image-vars.h efi: loongarch: Drop exports of unused string routines 2022-11-09 12:42:02 +01:00
inst.c LoongArch: Simplify larch_insn_gen_xxx implementation 2023-01-17 11:42:16 +08:00
io.c LoongArch: Add misc common routines 2022-06-03 20:09:28 +08:00
irq.c LoongArch: SMP: Change prefix from loongson3 to loongson 2022-11-21 19:02:57 +08:00
machine_kexec.c LoongArch: Add kdump support 2022-10-12 16:36:19 +08:00
mcount.S LoongArch/ftrace: Add basic support 2022-12-14 08:41:53 +08:00
mcount_dyn.S LoongArch/ftrace: Add HAVE_DYNAMIC_FTRACE_WITH_REGS support 2022-12-14 08:41:53 +08:00
mem.c LoongArch: Add kdump support 2022-10-12 16:36:19 +08:00
module-sections.c LoongArch: modules/ftrace: Initialize PLT at load time 2022-12-14 08:41:54 +08:00
module.c LoongArch: modules/ftrace: Initialize PLT at load time 2022-12-14 08:41:54 +08:00
numa.c LoongArch changes for v6.2 2022-12-19 08:23:27 -06:00
perf_event.c LoongArch: Add perf events support 2022-10-12 16:36:14 +08:00
perf_regs.c LoongArch: Add perf events support 2022-10-12 16:36:14 +08:00
proc.c LoongArch: cpuinfo: Fix a warning for CONFIG_CPUMASK_OFFSTACK 2022-08-12 13:10:10 +08:00
process.c LoongArch: Get frame info in unwind_start() when regs is not available 2023-01-17 11:42:16 +08:00
ptrace.c LoongArch: Fix missing fcsr in ptrace's fpr_set 2022-07-29 18:22:33 +08:00
relocate_kernel.S LoongArch: Add kdump support 2022-10-12 16:36:19 +08:00
reset.c LoongArch: Add hibernation (ACPI S4) support 2022-12-14 08:41:53 +08:00
setup.c LoongArch: Add hibernation (ACPI S4) support 2022-12-14 08:41:53 +08:00
signal.c LoongArch: Adjust arch_do_signal_or_restart() to adapt generic entry 2022-09-03 18:01:27 +08:00
smp.c LoongArch: Add suspend (ACPI S3) support 2022-12-14 08:41:53 +08:00
stacktrace.c LoongArch: Add USER_STACKTRACE support 2022-08-12 13:10:11 +08:00
switch.S LoongArch: Add basic STACKPROTECTOR support 2022-12-14 08:41:53 +08:00
syscall.c LoongArch: Add system call support 2022-06-03 20:09:28 +08:00
sysrq.c LoongArch: Add SysRq-x (TLB Dump) support 2022-10-12 16:36:14 +08:00
time.c LoongArch: Add suspend (ACPI S3) support 2022-12-14 08:41:53 +08:00
topology.c LoongArch: Do not create sysfs control file for io master CPUs 2022-10-12 16:36:08 +08:00
traps.c LoongArch: Strip guess unwinder out from prologue unwinder 2023-01-17 11:42:16 +08:00
unaligned.c LoongArch: Add unaligned access support 2022-12-14 08:36:11 +08:00
unwind.c LoongArch: Strip guess unwinder out from prologue unwinder 2023-01-17 11:42:16 +08:00
unwind_guess.c LoongArch: Strip guess unwinder out from prologue unwinder 2023-01-17 11:42:16 +08:00
unwind_prologue.c LoongArch: Add generic ex-handler unwind in prologue unwinder 2023-01-17 11:42:16 +08:00
vdso.c treewide: use get_random_u32_below() instead of deprecated function 2022-11-18 02:15:15 +01:00
vmlinux.lds.S LoongArch: Add alternative runtime patching mechanism 2022-12-14 08:36:11 +08:00