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    Subject[PATCH v2] arm64: add the printing of tpidr_elx in __show_regs()
    Date
    Commit 7158627686f0 ("arm64: percpu: implement optimised pcpu access
    using tpidr_el1") and commit 6d99b68933fb ("arm64: alternatives: use
    tpidr_el2 on VHE hosts") use tpidr_elx to cache my_cpu_offset to optimize
    pcpu access. However, when performing reverse execution based on the
    registers and the memory contents in kdump, this information is sometimes
    required if there is a pcpu access.

    Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
    ---
    arch/arm64/kernel/process.c | 11 +++++++++++
    1 file changed, 11 insertions(+)

    v1 --> v2:
    Directly print the tpidr_elx register of the current exception level.
    Avoid coupling with the implementation of 'my_cpu_offset'.

    diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
    index 5369e649fa79ff8..738932e6fa4e947 100644
    --- a/arch/arm64/kernel/process.c
    +++ b/arch/arm64/kernel/process.c
    @@ -216,6 +216,17 @@ void __show_regs(struct pt_regs *regs)
    show_regs_print_info(KERN_DEFAULT);
    print_pstate(regs);

    + switch (read_sysreg(CurrentEL)) {
    + case CurrentEL_EL1:
    + printk("tpidr_el1 : %016llx\n", read_sysreg(TPIDR_EL1));
    + break;
    + case CurrentEL_EL2:
    + printk("tpidr_el2 : %016llx\n", read_sysreg(TPIDR_EL2));
    + break;
    + default:
    + break;
    + }
    +
    if (!user_mode(regs)) {
    printk("pc : %pS\n", (void *)regs->pc);
    printk("lr : %pS\n", (void *)ptrauth_strip_insn_pac(lr));
    --
    2.25.1
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