[PATCH v2 0/2] target/riscv: Generate the GDB XML file for CSR registers dynamically

[Bin Meng <bmeng.cn@gmail.com>]

From: Bin Meng <bin.meng@windriver.com>


At present QEMU RISC-V uses a hardcoded XML to report the feature
"org.gnu.gdb.riscv.csr" [1]. There are two major issues with the
approach being used currently:

- The XML does not specify the "regnum" field of a CSR entry, hence
  consecutive numbers are used by the remote GDB client to access
  CSRs. In QEMU we have to maintain a map table to convert the GDB
  number to the hardware number which is error prone.
- The XML contains some CSRs that QEMU does not implement at all,
  which causes an "E14" response sent to remote GDB client.

Change to generate the CSR register list dynamically, based on the
availability presented in the CSR function table. This new approach
will reflect a correct list of CSRs that QEMU actually implements.

[1] https://sourceware.org/gdb/current/onlinedocs/gdb/RISC_002dV-Features.html#RISC_002dV-Features

Changes in v2:
- rebase on top of riscv-to-apply.next branch
- drop the first 2 patches that are already applied on riscv-to-apply.next

Bin Meng (2):
  target/riscv: Generate the GDB XML file for CSR registers dynamically
  target/riscv: Remove built-in GDB XML files for CSRs

 .../targets/riscv32-linux-user.mak            |   2 +-
 default-configs/targets/riscv32-softmmu.mak   |   2 +-
 .../targets/riscv64-linux-user.mak            |   2 +-
 default-configs/targets/riscv64-softmmu.mak   |   2 +-
 target/riscv/cpu.h                            |   2 +
 target/riscv/cpu.c                            |  12 +
 target/riscv/gdbstub.c                        | 308 +++---------------
 gdb-xml/riscv-32bit-csr.xml                   | 250 --------------
 gdb-xml/riscv-64bit-csr.xml                   | 250 --------------
 9 files changed, 62 insertions(+), 768 deletions(-)
 delete mode 100644 gdb-xml/riscv-32bit-csr.xml
 delete mode 100644 gdb-xml/riscv-64bit-csr.xml

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2.25.1