Hi Clément,
On 14/04/2025 14:34, Clément Léger wrote:
misaligned accesses traps are not nmi and should be treated as normal one using irqentry_enter()/exit().
All the traps that come from kernel mode are treated as nmi as it was suggested by Peter here: https://lore.kernel.org/linux-riscv/yyhv4uuxusfvm...@hirez.programming.kicks-ass.net/
I don't know the differences between irq_nmi_entry/exit() and irq_entry/exit(), so is that still correct to now treat the kernel traps as non-nmi?
Thanks, Alex
Since both load/store and user/kernel should use almost the same path and that we are going to add some code around that, factorize it. Signed-off-by: Clément Léger<cle...@rivosinc.com> --- arch/riscv/kernel/traps.c | 49 ++++++++++++++++----------------------- 1 file changed, 20 insertions(+), 29 deletions(-) diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index 8ff8e8b36524..55d9f3450398 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -198,47 +198,38 @@ asmlinkage __visible __trap_section void do_trap_insn_illegal(struct pt_regs *re DO_ERROR_INFO(do_trap_load_fault, SIGSEGV, SEGV_ACCERR, "load access fault");-asmlinkage __visible __trap_section void do_trap_load_misaligned(struct pt_regs *regs)+enum misaligned_access_type { + MISALIGNED_STORE, + MISALIGNED_LOAD, +}; + +static void do_trap_misaligned(struct pt_regs *regs, enum misaligned_access_type type) { - if (user_mode(regs)) { - irqentry_enter_from_user_mode(regs); + irqentry_state_t state = irqentry_enter(regs);+ if (type == MISALIGNED_LOAD) {if (handle_misaligned_load(regs)) do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - load address misaligned"); - - irqentry_exit_to_user_mode(regs); + "Oops - load address misaligned"); } else { - irqentry_state_t state = irqentry_nmi_enter(regs); - - if (handle_misaligned_load(regs)) + if (handle_misaligned_store(regs)) do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - load address misaligned"); - - irqentry_nmi_exit(regs, state); + "Oops - store (or AMO) address misaligned"); } + + irqentry_exit(regs, state); }-asmlinkage __visible __trap_section void do_trap_store_misaligned(struct pt_regs *regs)+asmlinkage __visible __trap_section void do_trap_load_misaligned(struct pt_regs *regs) { - if (user_mode(regs)) { - irqentry_enter_from_user_mode(regs); - - if (handle_misaligned_store(regs)) - do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - store (or AMO) address misaligned"); - - irqentry_exit_to_user_mode(regs); - } else { - irqentry_state_t state = irqentry_nmi_enter(regs); - - if (handle_misaligned_store(regs)) - do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - store (or AMO) address misaligned"); + do_trap_misaligned(regs, MISALIGNED_LOAD); +}- irqentry_nmi_exit(regs, state);- } +asmlinkage __visible __trap_section void do_trap_store_misaligned(struct pt_regs *regs) +{ + do_trap_misaligned(regs, MISALIGNED_STORE); } + DO_ERROR_INFO(do_trap_store_fault, SIGSEGV, SEGV_ACCERR, "store (or AMO) access fault"); DO_ERROR_INFO(do_trap_ecall_s,
