Hi, Qing,
I think we don't need to CC linux-kernel; on the other hand, CC
linux-arch and Arnd is worthy.
BTW, it seems you are missing V2 in the title.
Huacai
On Mon, Aug 1, 2022 at 8:17 PM Qing Zhang <zhangqing@loongson.cn> wrote:
>
> This series in order to add stacktrace suport, Some upcoming features require
> these changes, like trace, divide unwinder into guess unwinder and prologue
> unwinder is to add new unwinders in the future, eg:unwind_frame, unwind_orc .etc.
> Three stages when we do unwind,
> 1) unwind_start(), the prapare of unwinding, fill unwind_state.
> 2) unwind_done(), judge whether the unwind process is finished or not.
> 3) unwind_next_frame(), unwind the next frame.
>
> you can test them by:
> 1) echo t > /proc/sysrq-trigger
> 2) cat /proc/*/stack
> 4) ftrace: function graph
> 5) uprobe: echo 1 > ./options/userstacktrace
>
> Changes from v1 to v2:
>
> - Add the judgment of the offset value of ra in the prologue.
> (Suggested by Youling).
> - Create an inline function to check the sign bit, which is convenient
> for extending other types of immediates. (Suggested by Jinyang).
> - Fix sparse warning :
> arch/loongarch/include/asm/uaccess.h:232:32: sparse: sparse: incorrect
> type in argument 2 (different address spaces) @@ expected void const
> *from @@ got void const [noderef] __user *from @@
> - Add USER_STACKTRACE support as a series.
>
> Qing Zhang (4):
> LoongArch: Add guess unwinder support
> LoongArch: Add prologue unwinder support
> LoongArch: Add stacktrace support
> LoongArch: Add USER_STACKTRACE support
>
> arch/loongarch/Kconfig | 6 +
> arch/loongarch/Kconfig.debug | 28 ++++
> arch/loongarch/include/asm/inst.h | 52 +++++++
> arch/loongarch/include/asm/processor.h | 9 ++
> arch/loongarch/include/asm/stacktrace.h | 22 +++
> arch/loongarch/include/asm/switch_to.h | 14 +-
> arch/loongarch/include/asm/uaccess.h | 4 +-
> arch/loongarch/include/asm/unwind.h | 45 +++++++
> arch/loongarch/kernel/Makefile | 4 +
> arch/loongarch/kernel/asm-offsets.c | 2 +
> arch/loongarch/kernel/process.c | 64 +++++++++
> arch/loongarch/kernel/stacktrace.c | 79 +++++++++++
> arch/loongarch/kernel/switch.S | 2 +
> arch/loongarch/kernel/traps.c | 27 ++--
> arch/loongarch/kernel/unwind_guess.c | 65 +++++++++
> arch/loongarch/kernel/unwind_prologue.c | 172 ++++++++++++++++++++++++
> 16 files changed, 577 insertions(+), 18 deletions(-)
> create mode 100644 arch/loongarch/include/asm/unwind.h
> create mode 100644 arch/loongarch/kernel/stacktrace.c
> create mode 100644 arch/loongarch/kernel/unwind_guess.c
> create mode 100644 arch/loongarch/kernel/unwind_prologue.c
>
> --
> 2.20.1
>
>