forked from Mirrors/opensbi
9c78593269
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>
31 lines
723 B
C
31 lines
723 B
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2024 Rivos Inc.
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*
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* Authors:
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* Clément Léger <clement.leger@rivosinc.com>
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*/
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#include <sbi/sbi_console.h>
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#include <sbi/sbi_ecall_interface.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_sse.h>
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#include <sbi/sbi_trap.h>
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int sbi_double_trap_handler(struct sbi_trap_context *tcntx)
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{
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struct sbi_trap_regs *regs = &tcntx->regs;
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const struct sbi_trap_info *trap = &tcntx->trap;
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bool prev_virt = sbi_regs_from_virt(regs);
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if (sbi_mstatus_prev_mode(regs->mstatus) != PRV_S)
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return SBI_ERR_INVALID_PARAM;
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/* Exception was taken in VS-mode, redirect it to S-mode */
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if (prev_virt)
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return sbi_trap_redirect(regs, trap);
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return SBI_ENOTSUPP;
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}
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