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lib: sbi: add Ssdbltrp ISA extension support

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Add Ssdbltrp trap handler support for S-mode double trap handling. If
the trap is received while in VS-mode, then the trap is redirected to
S-mode. If caught while in HS-mode, then an error is returned to the top
trap handler which will panic.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
This commit is contained in:
Clément Léger
2024-10-18 10:40:04 +02:00
committed by Anup Patel
parent 80656bdb1d
commit 9c78593269
7 changed files with 46 additions and 1 deletions
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30
lib/sbi/sbi_double_trap.c Normal file
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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2024 Rivos Inc.
*
* Authors:
* Clément Léger <clement.leger@rivosinc.com>
*/
#include <sbi/sbi_console.h>
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_sse.h>
#include <sbi/sbi_trap.h>
int sbi_double_trap_handler(struct sbi_trap_context *tcntx)
{
struct sbi_trap_regs *regs = &tcntx->regs;
const struct sbi_trap_info *trap = &tcntx->trap;
bool prev_virt = sbi_regs_from_virt(regs);
if (sbi_mstatus_prev_mode(regs->mstatus) != PRV_S)
return SBI_ERR_INVALID_PARAM;
/* Exception was taken in VS-mode, redirect it to S-mode */
if (prev_virt)
return sbi_trap_redirect(regs, trap);
return SBI_ENOTSUPP;
}