/* * Moxie helper routines. * * Copyright (c) 2008, 2009, 2010, 2013 Anthony Green * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <stdio.h> #include <string.h> #include <assert.h> #include "config.h" #include "cpu.h" #include "mmu.h" #include "exec/exec-all.h" #include "exec/cpu_ldst.h" #include "qemu/host-utils.h" #include "exec/helper-proto.h" /* Try to fill the TLB and return an exception if error. If retaddr is NULL, it means that the function was called in C code (i.e. not from generated code or from helper.c) */ void tlb_fill(CPUState *cs, target_ulong addr, int is_write, int mmu_idx, uintptr_t retaddr) { int ret; ret = moxie_cpu_handle_mmu_fault(cs, addr, is_write, mmu_idx); if (unlikely(ret)) { if (retaddr) { cpu_restore_state(cs, retaddr); } } cpu_loop_exit(cs); } void helper_raise_exception(CPUMoxieState *env, int ex) { CPUState *cs = CPU(moxie_env_get_cpu(env)); cs->exception_index = ex; /* Stash the exception type. */ env->sregs[2] = ex; /* Stash the address where the exception occurred. */ cpu_restore_state(cs, GETPC()); env->sregs[5] = env->pc; /* Jump the the exception handline routine. */ env->pc = env->sregs[1]; cpu_loop_exit(cs); } uint32_t helper_div(CPUMoxieState *env, uint32_t a, uint32_t b) { if (unlikely(b == 0)) { helper_raise_exception(env, MOXIE_EX_DIV0); return 0; } if (unlikely(a == INT_MIN && b == -1)) { return INT_MIN; } return (int32_t)a / (int32_t)b; } uint32_t helper_udiv(CPUMoxieState *env, uint32_t a, uint32_t b) { if (unlikely(b == 0)) { helper_raise_exception(env, MOXIE_EX_DIV0); return 0; } return a / b; } void helper_debug(CPUMoxieState *env) { CPUState *cs = CPU(moxie_env_get_cpu(env)); cs->exception_index = EXCP_DEBUG; cpu_loop_exit(cs); } #if defined(CONFIG_USER_ONLY) void moxie_cpu_do_interrupt(CPUState *cs) { CPUState *cs = CPU(moxie_env_get_cpu(env)); cs->exception_index = -1; } int moxie_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw, int mmu_idx) { MoxieCPU *cpu = MOXIE_CPU(cs); cs->exception_index = 0xaa; cpu->env.debug1 = address; cpu_dump_state(cs, stderr, fprintf, 0); return 1; } #else /* !CONFIG_USER_ONLY */ int moxie_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw, int mmu_idx) { MoxieCPU *cpu = MOXIE_CPU(cs); CPUMoxieState *env = &cpu->env; MoxieMMUResult res; int prot, miss; target_ulong phy; int r = 1; address &= TARGET_PAGE_MASK; prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; miss = moxie_mmu_translate(&res, env, address, rw, mmu_idx); if (miss) { /* handle the miss. */ phy = 0; cs->exception_index = MOXIE_EX_MMU_MISS; } else { phy = res.phy; r = 0; } tlb_set_page(cs, address, phy, prot, mmu_idx, TARGET_PAGE_SIZE); return r; } void moxie_cpu_do_interrupt(CPUState *cs) { switch (cs->exception_index) { case MOXIE_EX_BREAK: break; default: break; } } hwaddr moxie_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) { MoxieCPU *cpu = MOXIE_CPU(cs); uint32_t phy = addr; MoxieMMUResult res; int miss; miss = moxie_mmu_translate(&res, &cpu->env, addr, 0, 0); if (!miss) { phy = res.phy; } return phy; } #endif