[Bug 276376] arm64 ddb: the disassembler does not recognise STP instructions

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276376

            Bug ID: 276376
           Summary: arm64 ddb: the disassembler does not recognise STP
                    instructions
           Product: Base System
           Version: 14.0-RELEASE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: dfr@rabson.org

Comparing DDB with gdb:


# sysctl debug.kdb.enter=1
debug.kdb.enKDB: enter: sysctl debug.kdb.enter
[ thread pid 873 tid 100293 ]
Stopped at      kdb_sysctl_enter+0x98:  str     xzr, [x19, #256]
db> x/i pci_add_child,10
pci_add_child:  undefined       a9ba7bfd
pci_add_child+0x4:      str     x27, [sp, #16]
pci_add_child+0x8:      undefined       a90267fa
pci_add_child+0xc:      undefined       a9035ff8
pci_add_child+0x10:     undefined       a90457f6
pci_add_child+0x14:     undefined       a9054ff4
pci_add_child+0x18:     mov     x29, sp
pci_add_child+0x1c:     mov     x21, x1
pci_add_child+0x20:     mov     x1, xzr
pci_add_child+0x24:     undefined       12800002
pci_add_child+0x28:     mov     x22, x0
pci_add_child+0x2c:     undefined       940b8a7b
pci_add_child+0x30:     mov     x19, x21
pci_add_child+0x34:     mov     x1, x21
pci_add_child+0x38:     mov     x20, x0
pci_add_child+0x3c:     str     x0, [x19, #24]!
db> c
ter: 0 -> 0
# kgdb ./kernel.full
GNU gdb (GDB) 13.2 [GDB v13.2 for FreeBSD]
Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "aarch64-portbld-freebsd14.0".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
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Reading symbols from ./kernel.full...
(kgdb) x/10i pci_add_child
   0xffff000000223194 <pci_add_child>:      stp       x29, x30, [sp, #-96]!
   0xffff000000223198 <pci_add_child+4>:    str       x27, [sp, #16]
   0xffff00000022319c <pci_add_child+8>:    stp       x26, x25, [sp, #32]
   0xffff0000002231a0 <pci_add_child+12>:   stp       x24, x23, [sp, #48]
   0xffff0000002231a4 <pci_add_child+16>:   stp       x22, x21, [sp, #64]
   0xffff0000002231a8 <pci_add_child+20>:   stp       x20, x19, [sp, #80]
   0xffff0000002231ac <pci_add_child+24>:   mov       x29, sp
   0xffff0000002231b0 <pci_add_child+28>:   mov       x21, x1
   0xffff0000002231b4 <pci_add_child+32>:   mov       x1, xzr
   0xffff0000002231b8 <pci_add_child+36>:   mov       w2, #0xffffffff          
    // #-1
(kgdb) q

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