$ gdb vmlinux 
GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git
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Reading symbols from vmlinux...
(gdb) disassemble acpi_ns_validate_handle
Dump of assembler code for function acpi_ns_validate_handle:
   0xffffffff815781cd <+0>:     call   0xffffffff81062c40 <__fentry__>
   0xffffffff815781d2 <+5>:     push   %r12
   0xffffffff815781d4 <+7>:     mov    %rdi,%r12
   0xffffffff815781d7 <+10>:    call   0xffffffff81584a44 <acpi_ut_track_stack_ptr>
   0xffffffff815781dc <+15>:    lea    -0x1(%r12),%rax
   0xffffffff815781e1 <+20>:    cmp    $0xfffffffffffffffd,%rax
   0xffffffff815781e5 <+24>:    jbe    0xffffffff815781f0 <acpi_ns_validate_handle+35>
   0xffffffff815781e7 <+26>:    mov    0x189b44a(%rip),%r12        # 0xffffffff82e13638 <acpi_gbl_root_node>
   0xffffffff815781ee <+33>:    jmp    0xffffffff81578229 <acpi_ns_validate_handle+92>
   0xffffffff815781f0 <+35>:    mov    %r12,%rdx
   0xffffffff815781f3 <+38>:    mov    $0xffffffff81eca4c0,%rsi
   0xffffffff815781fa <+45>:    mov    $0xffffffff82146d46,%rdi
   0xffffffff81578201 <+52>:    call   0xffffffff818909f1 <printk>
   0xffffffff81578206 <+57>:    cmpb   $0xf,0x8(%r12)
   0xffffffff8157820c <+63>:    jne    0xffffffff81578226 <acpi_ns_validate_handle+89>
   0xffffffff8157820e <+65>:    mov    %r12,%rdx
   0xffffffff81578211 <+68>:    mov    $0xffffffff81eca4c0,%rsi
   0xffffffff81578218 <+75>:    mov    $0xffffffff82146d46,%rdi
   0xffffffff8157821f <+82>:    call   0xffffffff818909f1 <printk>
   0xffffffff81578224 <+87>:    jmp    0xffffffff81578229 <acpi_ns_validate_handle+92>
   0xffffffff81578226 <+89>:    xor    %r12d,%r12d
   0xffffffff81578229 <+92>:    mov    %r12,%rax
   0xffffffff8157822c <+95>:    pop    %r12
   0xffffffff8157822e <+97>:    ret    
End of assembler dump.
(gdb) print 0xffffffff82146d46
$1 = 18446744071596961094
(gdb) print (char *)0xffffffff82146d46
$2 = 0xffffffff82146d46 "\001\066%s handle: %p\n"
(gdb) print (char *)0xffffffff81eca4c0
$3 = 0xffffffff81eca4c0 <__func__.3> "acpi_ns_validate_handle"
(gdb) disassemble printk
Dump of assembler code for function printk:
   0xffffffff818909f1 <+0>:     call   0xffffffff81062c40 <__fentry__>
   0xffffffff818909f6 <+5>:     push   %rbp
   0xffffffff818909f7 <+6>:     mov    %rsp,%rbp
   0xffffffff818909fa <+9>:     sub    $0x50,%rsp
   0xffffffff818909fe <+13>:    mov    %rsi,0x28(%rsp)
   0xffffffff81890a03 <+18>:    mov    %rsp,%rsi
   0xffffffff81890a06 <+21>:    mov    %rdx,0x30(%rsp)
   0xffffffff81890a0b <+26>:    mov    %rcx,0x38(%rsp)
   0xffffffff81890a10 <+31>:    mov    %r8,0x40(%rsp)
   0xffffffff81890a15 <+36>:    mov    %r9,0x48(%rsp)
   0xffffffff81890a1a <+41>:    mov    %gs:0x28,%rax
   0xffffffff81890a23 <+50>:    mov    %rax,0x18(%rsp)
   0xffffffff81890a28 <+55>:    xor    %eax,%eax
   0xffffffff81890a2a <+57>:    lea    0x10(%rbp),%rax
   0xffffffff81890a2e <+61>:    movl   $0x8,(%rsp)
   0xffffffff81890a35 <+68>:    mov    %rax,0x8(%rsp)
   0xffffffff81890a3a <+73>:    lea    0x20(%rsp),%rax
   0xffffffff81890a3f <+78>:    mov    %rax,0x10(%rsp)
   0xffffffff81890a44 <+83>:    call   0xffffffff810f1ca0 <vprintk_func>
   0xffffffff81890a49 <+88>:    mov    0x18(%rsp),%rdx
   0xffffffff81890a4e <+93>:    sub    %gs:0x28,%rdx
   0xffffffff81890a57 <+102>:   je     0xffffffff81890a5e <printk+109>
   0xffffffff81890a59 <+104>:   call   0xffffffff818c4500 <__stack_chk_fail>
   0xffffffff81890a5e <+109>:   leave  
   0xffffffff81890a5f <+110>:   ret    
End of assembler dump.
(gdb) disassemble __fentry__ 
Dump of assembler code for function __fentry__:
   0xffffffff81062c40 <+0>:     ret    
End of assembler dump.
(gdb) disassemble __stack_chk_fail
Dump of assembler code for function __stack_chk_fail:
   0xffffffff818c4500 <+0>:     mov    (%rsp),%rsi
   0xffffffff818c4504 <+4>:     mov    $0xffffffff820d24b8,%rdi
   0xffffffff818c450b <+11>:    call   0xffffffff8188b166 <panic>
End of assembler dump.
(gdb) disassemble vprintk_func 
Dump of assembler code for function vprintk_func:
   0xffffffff810f1ca0 <+0>:     call   0xffffffff81062c40 <__fentry__>
   0xffffffff810f1ca5 <+5>:     push   %r12
   0xffffffff810f1ca7 <+7>:     mov    %rsi,%r12
   0xffffffff810f1caa <+10>:    push   %rbp
   0xffffffff810f1cab <+11>:    mov    %rdi,%rbp
   0xffffffff810f1cae <+14>:    mov    %gs:0x7ef28d6b(%rip),%eax        # 0x1aa20 <printk_context>
   0xffffffff810f1cb5 <+21>:    test   $0x8000000,%eax
   0xffffffff810f1cba <+26>:    jne    0xffffffff810f1d14 <vprintk_func+116>
   0xffffffff810f1cbc <+28>:    mov    %gs:0x7ef28d5d(%rip),%eax        # 0x1aa20 <printk_context>
   0xffffffff810f1cc3 <+35>:    movabs $0xff0000000,%rdx
   0xffffffff810f1ccd <+45>:    cltq   
   0xffffffff810f1ccf <+47>:    mov    $0x18a20,%rdi
   0xffffffff810f1cd6 <+54>:    test   %rdx,%rax
   0xffffffff810f1cd9 <+57>:    jne    0xffffffff810f1cfe <vprintk_func+94>
   0xffffffff810f1cdb <+59>:    mov    %gs:0x7ef28d3e(%rip),%eax        # 0x1aa20 <printk_context>
   0xffffffff810f1ce2 <+66>:    test   $0x7ffffff,%eax
   0xffffffff810f1ce7 <+71>:    jne    0xffffffff810f1cf7 <vprintk_func+87>
   0xffffffff810f1ce9 <+73>:    mov    %r12,%rsi
   0xffffffff810f1cec <+76>:    mov    %rbp,%rdi
   0xffffffff810f1cef <+79>:    pop    %rbp
   0xffffffff810f1cf0 <+80>:    pop    %r12
   0xffffffff810f1cf2 <+82>:    jmp    0xffffffff810f1210 <vprintk_default>
   0xffffffff810f1cf7 <+87>:    mov    $0x1aa40,%rdi
   0xffffffff810f1cfe <+94>:    add    %gs:0x7ef1f862(%rip),%rdi        # 0x11568 <this_cpu_off>
   0xffffffff810f1d06 <+102>:   mov    %r12,%rdx
   0xffffffff810f1d09 <+105>:   mov    %rbp,%rsi
   0xffffffff810f1d0c <+108>:   pop    %rbp
   0xffffffff810f1d0d <+109>:   pop    %r12
   0xffffffff810f1d0f <+111>:   jmp    0xffffffff810f1990 <printk_safe_log_store>
   0xffffffff810f1d14 <+116>:   mov    $0xffffffff82d05328,%rdi
   0xffffffff810f1d1b <+123>:   call   0xffffffff818d1c90 <_raw_spin_trylock>
   0xffffffff810f1d20 <+128>:   test   %eax,%eax
   0xffffffff810f1d22 <+130>:   je     0xffffffff810f1cbc <vprintk_func+28>
   0xffffffff810f1d24 <+132>:   mov    %r12,%r8
   0xffffffff810f1d27 <+135>:   xor    %edi,%edi
   0xffffffff810f1d29 <+137>:   mov    %rbp,%rcx
   0xffffffff810f1d2c <+140>:   xor    %edx,%edx
   0xffffffff810f1d2e <+142>:   mov    $0xffffffff,%esi
   0xffffffff810f1d33 <+147>:   call   0xffffffff810f0db0 <vprintk_store>
   0xffffffff810f1d38 <+152>:   mov    $0xffffffff82d05328,%rdi
   0xffffffff810f1d3f <+159>:   mov    %eax,%r12d
   0xffffffff810f1d42 <+162>:   call   *0xffffffff8244b238
   0xffffffff810f1d49 <+169>:   call   0xffffffff810f1690 <defer_console_output>
   0xffffffff810f1d4e <+174>:   mov    %r12d,%eax
   0xffffffff810f1d51 <+177>:   pop    %rbp
   0xffffffff810f1d52 <+178>:   pop    %r12
   0xffffffff810f1d54 <+180>:   ret    
End of assembler dump.
(gdb)