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Diffstat (limited to 'target/moxie/helper.c')
| -rw-r--r-- | target/moxie/helper.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/target/moxie/helper.c b/target/moxie/helper.c new file mode 100644 index 0000000000..330299f5a7 --- /dev/null +++ b/target/moxie/helper.c @@ -0,0 +1,162 @@ +/* + * 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 "qemu/osdep.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, MMUAccessType access_type, + int mmu_idx, uintptr_t retaddr) +{ + int ret; + + ret = moxie_cpu_handle_mmu_fault(cs, addr, access_type, 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 to 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 |