code from machine mode: <pre> /* TEST jump to supervisor mode */ if(mhartid == 3){ asm volatile ("csrw sepc, %[reg]; sret" : : [reg] "r" (&main_supervisor)); log("main: jump to supervisor mode failed!\r\n"); } </pre>
here is supervisor mode function: <pre> void main_supervisor(){ log("main: we are in supervisor mode, now calling to machine mode\r\n"); asm volatile ("ecall"); log("main: we returned to supervisor mode\r\n"); for(;;){} // TODO supervisor mode not implemented, spin forever } </pre> here is the machine mode interrupt handler: <pre> void main_mtrap(){ uint64_t mhartid, mcause, mip; asm volatile ("csrr %[reg], mhartid" : [reg] "=r" (mhartid)); asm volatile ("csrr %[reg], mcause" : [reg] "=r" (mcause)); /* if most significant bit is set, * then an interrupt is pending * else an exception occurred */ switch(mcause){ case 0x0: log("main: exception (Instruction address misaligned) on hart %x\r\n", mhartid); break; case 0x1: log("main: exception (Instruction access fault) on hart %x\r\n", mhartid); break; case 0x2: log("main: exception (Illegal instruction) on hart %x\r\n", mhartid); break; case 0x3: log("main: exception (Breakpoint) on hart %x\r\n", mhartid); break; case 0x4: log("main: exception (Load address misaligned) on hart %x\r\n", mhartid); break; case 0x5: log("main: exception (Load access fault) on hart %x\r\n", mhartid); break; case 0x6: log("main: exception (Store/AMO address misaligned) on hart %x\r\n", mhartid); break; case 0x7: log("main: exception (Store/AMO access fault) on hart %x\r\n", mhartid); break; case 0x8: log("main: exception (Environment call from U-mode) on hart %x\r\n", mhartid); break; case 0x9: log("main: exception (Environment call from S-mode) on hart %x\r\n", mhartid); break; case 0xa: log("main: exception (Reserved) on hart %x\r\n", mhartid); break; case 0xb: log("main: exception (Environment call from M-mode) on hart %x\r\n", mhartid); break; case 0xc: log("main: exception (Instruction page fault) on hart %x\r\n", mhartid); break; case 0xd: log("main: exception (Load page fault) on hart %x\r\n", mhartid); break; case 0xe: log("main: exception (Reserved) on hart %x\r\n", mhartid); break; case 0xf: log("main: exception (Store/AMO page fault) on hart %x\r\n", mhartid); break; case 0x8000000000000000: log("main: interrupt (User software interrupt) on hart %x\r\n", mhartid); break; case 0x8000000000000001: log("main: interrupt (Supervisor software interrupt) on hart %x\r\n", mhartid); break; case 0x8000000000000002: log("main: interrupt (Reserved) on hart %x\r\n", mhartid); break; case 0x8000000000000003: log("main: interrupt (Machine software interrupt) on hart %x\r\n", mhartid); clint_lower(&clint, mhartid); break; case 0x8000000000000004: log("main: interrupt (User timer interrupt) on hart %x\r\n", mhartid); break; case 0x8000000000000005: log("main: interrupt (Supervisor timer interrupt) on hart %x\r\n", mhartid); break; case 0x8000000000000006: log("main: interrupt (Reserved) on hart %x\r\n", mhartid); break; case 0x8000000000000007: log("main: interrupt (Machine timer interrupt) on hart %x\r\n", mhartid); clint_timer(&clint, mhartid, 0x1000000); break; case 0x8000000000000008: log("main: interrupt (User external interrupt) on hart %x\r\n", mhartid); break; case 0x8000000000000009: log("main: interrupt (Supervisor external interrupt) on hart %x\r\n", mhartid); break; case 0x800000000000000a: log("main: interrupt (Reserved) on hart %x\r\n", mhartid); break; case 0x800000000000000b: log("main: interrupt (Machine external interrupt) on hart %x\r\n", mhartid); main_plic_wake_up(mhartid); break; default: if(mcause < 0x8000000000000000) log("main: unknown exception (%x) on hart %x\r\n", mcause, mhartid); else log("main: unknown interrupt (%x) on hart %x\r\n", mcause & 0x7fffffffffffffff, mhartid); break; } while(mcause < 0x8000000000000000){} // TODO exception or interrupt not implemented, spin forever } </pre> -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1859291 Title: RISC-V incorrect exception generated Status in QEMU: New Bug description: When using 'ecall' from supervisor mode, user exception is raised instead of supervisor exception. The problem is located under 'target/riscv/insn_trans/trans_priviledged.inc.c' in function 'static bool trans_ecall(DisasContext *ctx, arg_ecall *a)'. Best regards, Serge Teodori To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1859291/+subscriptions