[PATCH 0/9] Improve trap handling for nested traps

[Bo Gan <ganboing@gmail.com>]

On 3/11/24 9:09 AM, Anup Patel wrote:
> Nested traps will be a common when dealing with RAS error traps so
> this series improves trap handling for nested traps by introducing
> a linked-list based trap context chain.
> 
> These patches can also be found the trap_handling_imp_v1 branch at
> https://github.com/avpatel/opensbi.git
> 
> Anup Patel (9):
>    lib: sbi: Remove sbi_trap_exit() and related code
>    include: sbi: Add trap_context pointer in struct sbi_scratch
>    lib: sbi: Introduce trap context
>    lib: sbi: Simplify parameters of misaligned and access fault handlers
>    lib: sbi: Simplify parameters of sbi_illegal_insn_handler()
>    lib: sbi: Remove regs paramter of sbi_irqchip_process()
>    lib: sbi: Remove regs parameter from trap irq handling functions
>    lib: sbi: Pass trap context pointer to sbi_ecall_handler()
>    lib: sbi: Extend sbi_trap_error() to dump state in a nested trap
> 
>   firmware/fw_base.S             |  14 +--
>   include/sbi/sbi_ecall.h        |   4 +-
>   include/sbi/sbi_illegal_insn.h |   4 +-
>   include/sbi/sbi_irqchip.h      |   5 +-
>   include/sbi/sbi_scratch.h      |  14 +--
>   include/sbi/sbi_trap.h         |  24 ++++-
>   include/sbi/sbi_trap_ldst.h    |  12 +--
>   lib/sbi/sbi_ecall.c            |   3 +-
>   lib/sbi/sbi_illegal_insn.c     |  14 +--
>   lib/sbi/sbi_irqchip.c          |  10 +-
>   lib/sbi/sbi_trap.c             | 186 +++++++++++++++++----------------
>   lib/sbi/sbi_trap_ldst.c        |  67 ++++++------
>   lib/utils/irqchip/imsic.c      |   2 +-
>   13 files changed, 185 insertions(+), 174 deletions(-)
> 

Hi Anup,

Can you help providing an example for nested traps and the RAS extension?
The closest spec I can find (https://github.com/riscv/riscv-ssrastraps) is
still empty. I'm wondering where I can find the related documentation.

Bo