a88365c199
CSR predicate functions are added to the CSR table. mstatus.FS and counter enable checks are moved to predicate functions and two new predicates are added to check misa.S for s* CSRs and a new PMP CPU feature for pmp* CSRs. Processors that don't implement S-mode will trap on access to s* CSRs and processors that don't implement PMP will trap on accesses to pmp* CSRs. PMP checks are disabled in riscv_cpu_handle_mmu_fault when the PMP CPU feature is not present. Signed-off-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
564 lines
19 KiB
C
564 lines
19 KiB
C
/*
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* RISC-V CPU helpers for qemu.
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*
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* Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
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* Copyright (c) 2017-2018 SiFive, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2 or later, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu/log.h"
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#include "cpu.h"
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#include "exec/exec-all.h"
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#include "tcg-op.h"
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#define RISCV_DEBUG_INTERRUPT 0
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int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
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{
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#ifdef CONFIG_USER_ONLY
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return 0;
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#else
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return env->priv;
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#endif
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}
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#ifndef CONFIG_USER_ONLY
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static int riscv_cpu_local_irq_pending(CPURISCVState *env)
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{
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target_ulong mstatus_mie = get_field(env->mstatus, MSTATUS_MIE);
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target_ulong mstatus_sie = get_field(env->mstatus, MSTATUS_SIE);
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target_ulong pending = atomic_read(&env->mip) & env->mie;
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target_ulong mie = env->priv < PRV_M || (env->priv == PRV_M && mstatus_mie);
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target_ulong sie = env->priv < PRV_S || (env->priv == PRV_S && mstatus_sie);
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target_ulong irqs = (pending & ~env->mideleg & -mie) |
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(pending & env->mideleg & -sie);
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if (irqs) {
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return ctz64(irqs); /* since non-zero */
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} else {
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return EXCP_NONE; /* indicates no pending interrupt */
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}
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}
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#endif
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bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
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{
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#if !defined(CONFIG_USER_ONLY)
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if (interrupt_request & CPU_INTERRUPT_HARD) {
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RISCVCPU *cpu = RISCV_CPU(cs);
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CPURISCVState *env = &cpu->env;
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int interruptno = riscv_cpu_local_irq_pending(env);
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if (interruptno >= 0) {
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cs->exception_index = RISCV_EXCP_INT_FLAG | interruptno;
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riscv_cpu_do_interrupt(cs);
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return true;
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}
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}
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#endif
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return false;
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}
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#if !defined(CONFIG_USER_ONLY)
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/* iothread_mutex must be held */
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uint32_t riscv_cpu_update_mip(RISCVCPU *cpu, uint32_t mask, uint32_t value)
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{
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CPURISCVState *env = &cpu->env;
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uint32_t old, new, cmp = atomic_read(&env->mip);
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do {
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old = cmp;
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new = (old & ~mask) | (value & mask);
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cmp = atomic_cmpxchg(&env->mip, old, new);
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} while (old != cmp);
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if (new && !old) {
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cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
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} else if (!new && old) {
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cpu_reset_interrupt(CPU(cpu), CPU_INTERRUPT_HARD);
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}
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return old;
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}
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void riscv_set_mode(CPURISCVState *env, target_ulong newpriv)
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{
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if (newpriv > PRV_M) {
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g_assert_not_reached();
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}
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if (newpriv == PRV_H) {
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newpriv = PRV_U;
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}
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/* tlb_flush is unnecessary as mode is contained in mmu_idx */
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env->priv = newpriv;
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}
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/* get_physical_address - get the physical address for this virtual address
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*
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* Do a page table walk to obtain the physical address corresponding to a
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* virtual address. Returns 0 if the translation was successful
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*
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* Adapted from Spike's mmu_t::translate and mmu_t::walk
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*
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*/
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static int get_physical_address(CPURISCVState *env, hwaddr *physical,
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int *prot, target_ulong addr,
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int access_type, int mmu_idx)
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{
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/* NOTE: the env->pc value visible here will not be
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* correct, but the value visible to the exception handler
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* (riscv_cpu_do_interrupt) is correct */
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int mode = mmu_idx;
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if (mode == PRV_M && access_type != MMU_INST_FETCH) {
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if (get_field(env->mstatus, MSTATUS_MPRV)) {
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mode = get_field(env->mstatus, MSTATUS_MPP);
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}
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}
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if (mode == PRV_M || !riscv_feature(env, RISCV_FEATURE_MMU)) {
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*physical = addr;
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*prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
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return TRANSLATE_SUCCESS;
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}
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*prot = 0;
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target_ulong base;
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int levels, ptidxbits, ptesize, vm, sum;
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int mxr = get_field(env->mstatus, MSTATUS_MXR);
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if (env->priv_ver >= PRIV_VERSION_1_10_0) {
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base = get_field(env->satp, SATP_PPN) << PGSHIFT;
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sum = get_field(env->mstatus, MSTATUS_SUM);
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vm = get_field(env->satp, SATP_MODE);
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switch (vm) {
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case VM_1_10_SV32:
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levels = 2; ptidxbits = 10; ptesize = 4; break;
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case VM_1_10_SV39:
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levels = 3; ptidxbits = 9; ptesize = 8; break;
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case VM_1_10_SV48:
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levels = 4; ptidxbits = 9; ptesize = 8; break;
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case VM_1_10_SV57:
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levels = 5; ptidxbits = 9; ptesize = 8; break;
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case VM_1_10_MBARE:
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*physical = addr;
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*prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
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return TRANSLATE_SUCCESS;
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default:
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g_assert_not_reached();
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}
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} else {
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base = env->sptbr << PGSHIFT;
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sum = !get_field(env->mstatus, MSTATUS_PUM);
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vm = get_field(env->mstatus, MSTATUS_VM);
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switch (vm) {
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case VM_1_09_SV32:
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levels = 2; ptidxbits = 10; ptesize = 4; break;
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case VM_1_09_SV39:
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levels = 3; ptidxbits = 9; ptesize = 8; break;
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case VM_1_09_SV48:
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levels = 4; ptidxbits = 9; ptesize = 8; break;
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case VM_1_09_MBARE:
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*physical = addr;
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*prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
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return TRANSLATE_SUCCESS;
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default:
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g_assert_not_reached();
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}
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}
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CPUState *cs = CPU(riscv_env_get_cpu(env));
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int va_bits = PGSHIFT + levels * ptidxbits;
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target_ulong mask = (1L << (TARGET_LONG_BITS - (va_bits - 1))) - 1;
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target_ulong masked_msbs = (addr >> (va_bits - 1)) & mask;
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if (masked_msbs != 0 && masked_msbs != mask) {
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return TRANSLATE_FAIL;
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}
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int ptshift = (levels - 1) * ptidxbits;
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int i;
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#if !TCG_OVERSIZED_GUEST
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restart:
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#endif
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for (i = 0; i < levels; i++, ptshift -= ptidxbits) {
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target_ulong idx = (addr >> (PGSHIFT + ptshift)) &
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((1 << ptidxbits) - 1);
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/* check that physical address of PTE is legal */
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target_ulong pte_addr = base + idx * ptesize;
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#if defined(TARGET_RISCV32)
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target_ulong pte = ldl_phys(cs->as, pte_addr);
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#elif defined(TARGET_RISCV64)
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target_ulong pte = ldq_phys(cs->as, pte_addr);
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#endif
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target_ulong ppn = pte >> PTE_PPN_SHIFT;
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if (!(pte & PTE_V)) {
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/* Invalid PTE */
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return TRANSLATE_FAIL;
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} else if (!(pte & (PTE_R | PTE_W | PTE_X))) {
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/* Inner PTE, continue walking */
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base = ppn << PGSHIFT;
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} else if ((pte & (PTE_R | PTE_W | PTE_X)) == PTE_W) {
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/* Reserved leaf PTE flags: PTE_W */
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return TRANSLATE_FAIL;
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} else if ((pte & (PTE_R | PTE_W | PTE_X)) == (PTE_W | PTE_X)) {
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/* Reserved leaf PTE flags: PTE_W + PTE_X */
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return TRANSLATE_FAIL;
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} else if ((pte & PTE_U) && ((mode != PRV_U) &&
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(!sum || access_type == MMU_INST_FETCH))) {
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/* User PTE flags when not U mode and mstatus.SUM is not set,
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or the access type is an instruction fetch */
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return TRANSLATE_FAIL;
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} else if (!(pte & PTE_U) && (mode != PRV_S)) {
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/* Supervisor PTE flags when not S mode */
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return TRANSLATE_FAIL;
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} else if (ppn & ((1ULL << ptshift) - 1)) {
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/* Misaligned PPN */
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return TRANSLATE_FAIL;
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} else if (access_type == MMU_DATA_LOAD && !((pte & PTE_R) ||
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((pte & PTE_X) && mxr))) {
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/* Read access check failed */
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return TRANSLATE_FAIL;
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} else if (access_type == MMU_DATA_STORE && !(pte & PTE_W)) {
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/* Write access check failed */
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return TRANSLATE_FAIL;
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} else if (access_type == MMU_INST_FETCH && !(pte & PTE_X)) {
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/* Fetch access check failed */
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return TRANSLATE_FAIL;
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} else {
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/* if necessary, set accessed and dirty bits. */
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target_ulong updated_pte = pte | PTE_A |
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(access_type == MMU_DATA_STORE ? PTE_D : 0);
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/* Page table updates need to be atomic with MTTCG enabled */
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if (updated_pte != pte) {
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/*
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* - if accessed or dirty bits need updating, and the PTE is
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* in RAM, then we do so atomically with a compare and swap.
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* - if the PTE is in IO space or ROM, then it can't be updated
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* and we return TRANSLATE_FAIL.
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* - if the PTE changed by the time we went to update it, then
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* it is no longer valid and we must re-walk the page table.
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*/
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MemoryRegion *mr;
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hwaddr l = sizeof(target_ulong), addr1;
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mr = address_space_translate(cs->as, pte_addr,
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&addr1, &l, false, MEMTXATTRS_UNSPECIFIED);
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if (memory_region_is_ram(mr)) {
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target_ulong *pte_pa =
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qemu_map_ram_ptr(mr->ram_block, addr1);
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#if TCG_OVERSIZED_GUEST
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/* MTTCG is not enabled on oversized TCG guests so
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* page table updates do not need to be atomic */
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*pte_pa = pte = updated_pte;
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#else
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target_ulong old_pte =
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atomic_cmpxchg(pte_pa, pte, updated_pte);
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if (old_pte != pte) {
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goto restart;
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} else {
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pte = updated_pte;
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}
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#endif
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} else {
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/* misconfigured PTE in ROM (AD bits are not preset) or
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* PTE is in IO space and can't be updated atomically */
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return TRANSLATE_FAIL;
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}
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}
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/* for superpage mappings, make a fake leaf PTE for the TLB's
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benefit. */
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target_ulong vpn = addr >> PGSHIFT;
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*physical = (ppn | (vpn & ((1L << ptshift) - 1))) << PGSHIFT;
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/* set permissions on the TLB entry */
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if ((pte & PTE_R) || ((pte & PTE_X) && mxr)) {
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*prot |= PAGE_READ;
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}
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if ((pte & PTE_X)) {
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*prot |= PAGE_EXEC;
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}
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/* add write permission on stores or if the page is already dirty,
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so that we TLB miss on later writes to update the dirty bit */
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if ((pte & PTE_W) &&
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(access_type == MMU_DATA_STORE || (pte & PTE_D))) {
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*prot |= PAGE_WRITE;
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}
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return TRANSLATE_SUCCESS;
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}
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}
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return TRANSLATE_FAIL;
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}
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static void raise_mmu_exception(CPURISCVState *env, target_ulong address,
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MMUAccessType access_type)
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{
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CPUState *cs = CPU(riscv_env_get_cpu(env));
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int page_fault_exceptions =
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(env->priv_ver >= PRIV_VERSION_1_10_0) &&
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get_field(env->satp, SATP_MODE) != VM_1_10_MBARE;
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switch (access_type) {
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case MMU_INST_FETCH:
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cs->exception_index = page_fault_exceptions ?
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RISCV_EXCP_INST_PAGE_FAULT : RISCV_EXCP_INST_ACCESS_FAULT;
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break;
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case MMU_DATA_LOAD:
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cs->exception_index = page_fault_exceptions ?
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RISCV_EXCP_LOAD_PAGE_FAULT : RISCV_EXCP_LOAD_ACCESS_FAULT;
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break;
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case MMU_DATA_STORE:
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cs->exception_index = page_fault_exceptions ?
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RISCV_EXCP_STORE_PAGE_FAULT : RISCV_EXCP_STORE_AMO_ACCESS_FAULT;
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break;
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default:
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g_assert_not_reached();
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}
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env->badaddr = address;
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}
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hwaddr riscv_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
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{
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RISCVCPU *cpu = RISCV_CPU(cs);
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hwaddr phys_addr;
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int prot;
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int mmu_idx = cpu_mmu_index(&cpu->env, false);
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if (get_physical_address(&cpu->env, &phys_addr, &prot, addr, 0, mmu_idx)) {
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return -1;
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}
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return phys_addr;
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}
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void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
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MMUAccessType access_type, int mmu_idx,
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uintptr_t retaddr)
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{
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RISCVCPU *cpu = RISCV_CPU(cs);
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CPURISCVState *env = &cpu->env;
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switch (access_type) {
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case MMU_INST_FETCH:
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cs->exception_index = RISCV_EXCP_INST_ADDR_MIS;
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break;
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case MMU_DATA_LOAD:
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cs->exception_index = RISCV_EXCP_LOAD_ADDR_MIS;
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break;
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case MMU_DATA_STORE:
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cs->exception_index = RISCV_EXCP_STORE_AMO_ADDR_MIS;
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break;
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default:
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g_assert_not_reached();
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}
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env->badaddr = addr;
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do_raise_exception_err(env, cs->exception_index, retaddr);
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}
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/* called by qemu's softmmu to fill the qemu tlb */
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void tlb_fill(CPUState *cs, target_ulong addr, int size,
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MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
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{
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int ret;
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ret = riscv_cpu_handle_mmu_fault(cs, addr, size, access_type, mmu_idx);
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if (ret == TRANSLATE_FAIL) {
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RISCVCPU *cpu = RISCV_CPU(cs);
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CPURISCVState *env = &cpu->env;
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do_raise_exception_err(env, cs->exception_index, retaddr);
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}
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}
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#endif
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int riscv_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size,
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int rw, int mmu_idx)
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{
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RISCVCPU *cpu = RISCV_CPU(cs);
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CPURISCVState *env = &cpu->env;
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#if !defined(CONFIG_USER_ONLY)
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hwaddr pa = 0;
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int prot;
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#endif
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int ret = TRANSLATE_FAIL;
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qemu_log_mask(CPU_LOG_MMU,
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"%s pc " TARGET_FMT_lx " ad %" VADDR_PRIx " rw %d mmu_idx \
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%d\n", __func__, env->pc, address, rw, mmu_idx);
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#if !defined(CONFIG_USER_ONLY)
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ret = get_physical_address(env, &pa, &prot, address, rw, mmu_idx);
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qemu_log_mask(CPU_LOG_MMU,
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"%s address=%" VADDR_PRIx " ret %d physical " TARGET_FMT_plx
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" prot %d\n", __func__, address, ret, pa, prot);
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if (riscv_feature(env, RISCV_FEATURE_PMP) &&
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!pmp_hart_has_privs(env, pa, TARGET_PAGE_SIZE, 1 << rw)) {
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ret = TRANSLATE_FAIL;
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}
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if (ret == TRANSLATE_SUCCESS) {
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tlb_set_page(cs, address & TARGET_PAGE_MASK, pa & TARGET_PAGE_MASK,
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prot, mmu_idx, TARGET_PAGE_SIZE);
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} else if (ret == TRANSLATE_FAIL) {
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raise_mmu_exception(env, address, rw);
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}
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#else
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switch (rw) {
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case MMU_INST_FETCH:
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cs->exception_index = RISCV_EXCP_INST_PAGE_FAULT;
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break;
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case MMU_DATA_LOAD:
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cs->exception_index = RISCV_EXCP_LOAD_PAGE_FAULT;
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break;
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case MMU_DATA_STORE:
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cs->exception_index = RISCV_EXCP_STORE_PAGE_FAULT;
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break;
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}
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#endif
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return ret;
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}
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/*
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* Handle Traps
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*
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* Adapted from Spike's processor_t::take_trap.
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*
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*/
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void riscv_cpu_do_interrupt(CPUState *cs)
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{
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#if !defined(CONFIG_USER_ONLY)
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RISCVCPU *cpu = RISCV_CPU(cs);
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CPURISCVState *env = &cpu->env;
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if (RISCV_DEBUG_INTERRUPT) {
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int log_cause = cs->exception_index & RISCV_EXCP_INT_MASK;
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if (cs->exception_index & RISCV_EXCP_INT_FLAG) {
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qemu_log_mask(LOG_TRACE, "core "
|
|
TARGET_FMT_ld ": trap %s, epc 0x" TARGET_FMT_lx "\n",
|
|
env->mhartid, riscv_intr_names[log_cause], env->pc);
|
|
} else {
|
|
qemu_log_mask(LOG_TRACE, "core "
|
|
TARGET_FMT_ld ": intr %s, epc 0x" TARGET_FMT_lx "\n",
|
|
env->mhartid, riscv_excp_names[log_cause], env->pc);
|
|
}
|
|
}
|
|
|
|
target_ulong fixed_cause = 0;
|
|
if (cs->exception_index & (RISCV_EXCP_INT_FLAG)) {
|
|
/* hacky for now. the MSB (bit 63) indicates interrupt but cs->exception
|
|
index is only 32 bits wide */
|
|
fixed_cause = cs->exception_index & RISCV_EXCP_INT_MASK;
|
|
fixed_cause |= ((target_ulong)1) << (TARGET_LONG_BITS - 1);
|
|
} else {
|
|
/* fixup User ECALL -> correct priv ECALL */
|
|
if (cs->exception_index == RISCV_EXCP_U_ECALL) {
|
|
switch (env->priv) {
|
|
case PRV_U:
|
|
fixed_cause = RISCV_EXCP_U_ECALL;
|
|
break;
|
|
case PRV_S:
|
|
fixed_cause = RISCV_EXCP_S_ECALL;
|
|
break;
|
|
case PRV_H:
|
|
fixed_cause = RISCV_EXCP_H_ECALL;
|
|
break;
|
|
case PRV_M:
|
|
fixed_cause = RISCV_EXCP_M_ECALL;
|
|
break;
|
|
}
|
|
} else {
|
|
fixed_cause = cs->exception_index;
|
|
}
|
|
}
|
|
|
|
target_ulong backup_epc = env->pc;
|
|
|
|
target_ulong bit = fixed_cause;
|
|
target_ulong deleg = env->medeleg;
|
|
|
|
int hasbadaddr =
|
|
(fixed_cause == RISCV_EXCP_INST_ADDR_MIS) ||
|
|
(fixed_cause == RISCV_EXCP_INST_ACCESS_FAULT) ||
|
|
(fixed_cause == RISCV_EXCP_LOAD_ADDR_MIS) ||
|
|
(fixed_cause == RISCV_EXCP_STORE_AMO_ADDR_MIS) ||
|
|
(fixed_cause == RISCV_EXCP_LOAD_ACCESS_FAULT) ||
|
|
(fixed_cause == RISCV_EXCP_STORE_AMO_ACCESS_FAULT) ||
|
|
(fixed_cause == RISCV_EXCP_INST_PAGE_FAULT) ||
|
|
(fixed_cause == RISCV_EXCP_LOAD_PAGE_FAULT) ||
|
|
(fixed_cause == RISCV_EXCP_STORE_PAGE_FAULT);
|
|
|
|
if (bit & ((target_ulong)1 << (TARGET_LONG_BITS - 1))) {
|
|
deleg = env->mideleg;
|
|
bit &= ~((target_ulong)1 << (TARGET_LONG_BITS - 1));
|
|
}
|
|
|
|
if (env->priv <= PRV_S && bit < 64 && ((deleg >> bit) & 1)) {
|
|
/* handle the trap in S-mode */
|
|
/* No need to check STVEC for misaligned - lower 2 bits cannot be set */
|
|
env->pc = env->stvec;
|
|
env->scause = fixed_cause;
|
|
env->sepc = backup_epc;
|
|
|
|
if (hasbadaddr) {
|
|
if (RISCV_DEBUG_INTERRUPT) {
|
|
qemu_log_mask(LOG_TRACE, "core " TARGET_FMT_ld ": badaddr 0x"
|
|
TARGET_FMT_lx "\n", env->mhartid, env->badaddr);
|
|
}
|
|
env->sbadaddr = env->badaddr;
|
|
} else {
|
|
/* otherwise we must clear sbadaddr/stval
|
|
* todo: support populating stval on illegal instructions */
|
|
env->sbadaddr = 0;
|
|
}
|
|
|
|
target_ulong s = env->mstatus;
|
|
s = set_field(s, MSTATUS_SPIE, env->priv_ver >= PRIV_VERSION_1_10_0 ?
|
|
get_field(s, MSTATUS_SIE) : get_field(s, MSTATUS_UIE << env->priv));
|
|
s = set_field(s, MSTATUS_SPP, env->priv);
|
|
s = set_field(s, MSTATUS_SIE, 0);
|
|
env->mstatus = s;
|
|
riscv_set_mode(env, PRV_S);
|
|
} else {
|
|
/* No need to check MTVEC for misaligned - lower 2 bits cannot be set */
|
|
env->pc = env->mtvec;
|
|
env->mepc = backup_epc;
|
|
env->mcause = fixed_cause;
|
|
|
|
if (hasbadaddr) {
|
|
if (RISCV_DEBUG_INTERRUPT) {
|
|
qemu_log_mask(LOG_TRACE, "core " TARGET_FMT_ld ": badaddr 0x"
|
|
TARGET_FMT_lx "\n", env->mhartid, env->badaddr);
|
|
}
|
|
env->mbadaddr = env->badaddr;
|
|
} else {
|
|
/* otherwise we must clear mbadaddr/mtval
|
|
* todo: support populating mtval on illegal instructions */
|
|
env->mbadaddr = 0;
|
|
}
|
|
|
|
target_ulong s = env->mstatus;
|
|
s = set_field(s, MSTATUS_MPIE, env->priv_ver >= PRIV_VERSION_1_10_0 ?
|
|
get_field(s, MSTATUS_MIE) : get_field(s, MSTATUS_UIE << env->priv));
|
|
s = set_field(s, MSTATUS_MPP, env->priv);
|
|
s = set_field(s, MSTATUS_MIE, 0);
|
|
env->mstatus = s;
|
|
riscv_set_mode(env, PRV_M);
|
|
}
|
|
/* TODO yield load reservation */
|
|
#endif
|
|
cs->exception_index = EXCP_NONE; /* mark handled to qemu */
|
|
}
|