[PATCH v2 0/3] Fix objtool warning about do_syscall() on LoongArch

From: Tiezhu Yang
Date: Sun Aug 04 2024 - 23:27:37 EST


With this series, there is no objtool warning about do_syscall() and
there is handle_syscall() which is the previous frame of do_syscall()
in the call trace when running "echo l > /proc/sysrq-trigger", tested
with the following two configs:

(1) CONFIG_RANDOMIZE_KSTACK_OFFSET=y &&
CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT=n
(2) CONFIG_RANDOMIZE_KSTACK_OFFSET=y &&
CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT=y

Tiezhu Yang (3):
objtool/LoongArch: Decode secondary stack instruction
objtool: Handle secondary stack related instructions
LoongArch: Remove STACK_FRAME_NON_STANDARD(do_syscall)

arch/loongarch/kernel/syscall.c | 4 ----
tools/arch/loongarch/include/asm/inst.h | 12 ++++++++++
tools/objtool/arch/loongarch/decode.c | 29 ++++++++++++++++++++++++-
tools/objtool/check.c | 22 +++++++++++++++++++
tools/objtool/include/objtool/elf.h | 1 +
5 files changed, 63 insertions(+), 5 deletions(-)

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2.42.0