[v4] target/arm: Added support for SME register exposure to GDB

[PATCH v4 0/2] target/arm: Added support for SME register exposure to GDB

Posted by Vacha Bhavsar 4 months, 4 weeks ago

The QEMU GDB stub does not expose the ZA storage SME register to GDB via
the remote serial protocol, which can be a useful functionality to debug SME
code. To provide this functionality in Aarch64 target, this patch registers the
SME register set with the GDB stub. To do so, this patch implements the
aarch64_gdb_get_sme_reg() and aarch64_gdb_set_sme_reg() functions to
specify how to get and set the SME registers, and the
arm_gen_dynamic_smereg_feature() function to generate the target
description in XML format to indicate the target architecture supports SME.
Finally, this patch includes a dyn_smereg_feature structure to hold this
GDB XML description of the SME registers for each CPU.

Furthermore, this patch series increases the value of MAX_PACKET_LENGTH
to allow for remote GDB debugging of the ZA register when the vector
length is maximal.

Signed-off-by: Vacha Bhavsar <vacha.bhavsar@oss.qualcomm.com>

Vacha Bhavsar (2):
  target/arm: Increase MAX_PACKET_LENGTH for SME ZA remote gdb debugging
  target/arm: Added support for SME register exposure to GDB

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2.34.1

Re: [PATCH v4 0/2] target/arm: Added support for SME register exposure to GDB

Posted by Philippe Mathieu-Daudé 4 months, 4 weeks ago

Cc'ing Gustavo.

On 22/7/25 22:14, Vacha Bhavsar wrote:
> The QEMU GDB stub does not expose the ZA storage SME register to GDB via
> the remote serial protocol, which can be a useful functionality to debug SME
> code. To provide this functionality in Aarch64 target, this patch registers the
> SME register set with the GDB stub. To do so, this patch implements the
> aarch64_gdb_get_sme_reg() and aarch64_gdb_set_sme_reg() functions to
> specify how to get and set the SME registers, and the
> arm_gen_dynamic_smereg_feature() function to generate the target
> description in XML format to indicate the target architecture supports SME.
> Finally, this patch includes a dyn_smereg_feature structure to hold this
> GDB XML description of the SME registers for each CPU.
> 
> Furthermore, this patch series increases the value of MAX_PACKET_LENGTH
> to allow for remote GDB debugging of the ZA register when the vector
> length is maximal.
> 
> Signed-off-by: Vacha Bhavsar <vacha.bhavsar@oss.qualcomm.com>
> 
> Vacha Bhavsar (2):
>    target/arm: Increase MAX_PACKET_LENGTH for SME ZA remote gdb debugging
>    target/arm: Added support for SME register exposure to GDB
>