Privileged spec section 4.1.9 mentions:
"When a trap is taken into S-mode, stval is written with
exception-specific information to assist software in handling the trap.
(...)
If stval is written with a nonzero value when a breakpoint,
address-misaligned, access-fault, or page-fault exception occurs on an
instruction fetch, load, or store, then stval will contain the faulting
virtual address."
A similar text is found for mtval in section 3.1.16.
Setting mtval/stval in this scenario is optional, but some softwares read
these regs when handling ebreaks.
Write 'badaddr' in all ebreak breakpoints to write the appropriate
'tval' during riscv_do_cpu_interrrupt().
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240416230437.1869024-3-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
f15af01740