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From: "luis.machado at arm dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/29471] gdb 12.1 'i r' command doesn't recognise register
 NZCV under target aarch64-none-elf
Date: Fri, 21 Oct 2022 14:30:23 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29471

--- Comment #3 from Luis Machado <luis.machado at arm dot com> ---
Hi Pete,

I don't think there is anything wrong with QEMU or GDB. You can find all the
bits you described in the CPSR.

The CPSR is described like so:

  <flags id=3D"cpsr_flags" size=3D"4">
    <!-- Stack Pointer.  -->
    <field name=3D"SP" start=3D"0" end=3D"0"/>

    <!-- Exception Level.  -->
    <field name=3D"EL" start=3D"2" end=3D"3"/>
    <!-- Execution state.  -->
    <field name=3D"nRW" start=3D"4" end=3D"4"/>

    <!-- FIQ interrupt mask.  -->
    <field name=3D"F" start=3D"6" end=3D"6"/>
    <!-- IRQ interrupt mask.  -->
    <field name=3D"I" start=3D"7" end=3D"7"/>
    <!-- SError interrupt mask.  -->
    <field name=3D"A" start=3D"8" end=3D"8"/>
    <!-- Debug exception mask.  -->
    <field name=3D"D" start=3D"9" end=3D"9"/>

    <!-- ARMv8.5-A: Branch Target Identification BTYPE.  -->
    <field name=3D"BTYPE" start=3D"10" end=3D"11"/>

    <!-- ARMv8.0-A: Speculative Store Bypass.  -->
    <field name=3D"SSBS" start=3D"12" end=3D"12"/>

    <!-- Illegal Execution state.  -->
    <field name=3D"IL" start=3D"20" end=3D"20"/>
    <!-- Software Step.  -->
    <field name=3D"SS" start=3D"21" end=3D"21"/>
    <!-- ARMv8.1-A: Privileged Access Never.  -->
    <field name=3D"PAN" start=3D"22" end=3D"22"/>
    <!-- ARMv8.2-A: User Access Override.  -->
    <field name=3D"UAO" start=3D"23" end=3D"23"/>
    <!-- ARMv8.4-A: Data Independent Timing.  -->
    <field name=3D"DIT" start=3D"24" end=3D"24"/>
    <!-- ARMv8.5-A: Tag Check Override.  -->
    <field name=3D"TCO" start=3D"25" end=3D"25"/>

    <!-- Overflow Condition flag.  -->
    <field name=3D"V" start=3D"28" end=3D"28"/>
    <!-- Carry Condition flag.  -->
    <field name=3D"C" start=3D"29" end=3D"29"/>
    <!-- Zero Condition flag.  -->
    <field name=3D"Z" start=3D"30" end=3D"30"/>
    <!-- Negative Condition flag.  -->
    <field name=3D"N" start=3D"31" end=3D"31"/>
  </flags>
  <reg name=3D"cpsr" bitsize=3D"32" type=3D"cpsr_flags"/>

For the 1-bit fields, GDB will show the field name if the bit is 1. Otherwi=
se
nothing will be shown.

So in your example...

---
cpsr           0x200003cd          [ SP EL=3D3 F I A D BTYPE=3D0 C ]
---

You can see the various bits that are set. For fields with more than a sing=
le
bit, you will see the value, like BTYPE.

Does that clarify things?

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