diff options
Diffstat (limited to 'target/i386/mem_helper.c')
| -rw-r--r-- | target/i386/mem_helper.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/target/i386/mem_helper.c b/target/i386/mem_helper.c new file mode 100644 index 0000000000..70f67668ab --- /dev/null +++ b/target/i386/mem_helper.c @@ -0,0 +1,215 @@ +/* + * x86 memory access helpers + * + * Copyright (c) 2003 Fabrice Bellard + * + * 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 Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "qemu/osdep.h" +#include "cpu.h" +#include "exec/helper-proto.h" +#include "exec/exec-all.h" +#include "exec/cpu_ldst.h" +#include "qemu/int128.h" +#include "tcg.h" + +void helper_cmpxchg8b_unlocked(CPUX86State *env, target_ulong a0) +{ + uintptr_t ra = GETPC(); + uint64_t oldv, cmpv, newv; + int eflags; + + eflags = cpu_cc_compute_all(env, CC_OP); + + cmpv = deposit64(env->regs[R_EAX], 32, 32, env->regs[R_EDX]); + newv = deposit64(env->regs[R_EBX], 32, 32, env->regs[R_ECX]); + + oldv = cpu_ldq_data_ra(env, a0, ra); + newv = (cmpv == oldv ? newv : oldv); + /* always do the store */ + cpu_stq_data_ra(env, a0, newv, ra); + + if (oldv == cmpv) { + eflags |= CC_Z; + } else { + env->regs[R_EAX] = (uint32_t)oldv; + env->regs[R_EDX] = (uint32_t)(oldv >> 32); + eflags &= ~CC_Z; + } + CC_SRC = eflags; +} + +void helper_cmpxchg8b(CPUX86State *env, target_ulong a0) +{ +#ifdef CONFIG_ATOMIC64 + uint64_t oldv, cmpv, newv; + int eflags; + + eflags = cpu_cc_compute_all(env, CC_OP); + + cmpv = deposit64(env->regs[R_EAX], 32, 32, env->regs[R_EDX]); + newv = deposit64(env->regs[R_EBX], 32, 32, env->regs[R_ECX]); + +#ifdef CONFIG_USER_ONLY + { + uint64_t *haddr = g2h(a0); + cmpv = cpu_to_le64(cmpv); + newv = cpu_to_le64(newv); + oldv = atomic_cmpxchg__nocheck(haddr, cmpv, newv); + oldv = le64_to_cpu(oldv); + } +#else + { + uintptr_t ra = GETPC(); + int mem_idx = cpu_mmu_index(env, false); + TCGMemOpIdx oi = make_memop_idx(MO_TEQ, mem_idx); + oldv = helper_atomic_cmpxchgq_le_mmu(env, a0, cmpv, newv, oi, ra); + } +#endif + + if (oldv == cmpv) { + eflags |= CC_Z; + } else { + env->regs[R_EAX] = (uint32_t)oldv; + env->regs[R_EDX] = (uint32_t)(oldv >> 32); + eflags &= ~CC_Z; + } + CC_SRC = eflags; +#else + cpu_loop_exit_atomic(ENV_GET_CPU(env), GETPC()); +#endif /* CONFIG_ATOMIC64 */ +} + +#ifdef TARGET_X86_64 +void helper_cmpxchg16b_unlocked(CPUX86State *env, target_ulong a0) +{ + uintptr_t ra = GETPC(); + Int128 oldv, cmpv, newv; + uint64_t o0, o1; + int eflags; + bool success; + + if ((a0 & 0xf) != 0) { + raise_exception_ra(env, EXCP0D_GPF, GETPC()); + } + eflags = cpu_cc_compute_all(env, CC_OP); + + cmpv = int128_make128(env->regs[R_EAX], env->regs[R_EDX]); + newv = int128_make128(env->regs[R_EBX], env->regs[R_ECX]); + + o0 = cpu_ldq_data_ra(env, a0 + 0, ra); + o1 = cpu_ldq_data_ra(env, a0 + 8, ra); + + oldv = int128_make128(o0, o1); + success = int128_eq(oldv, cmpv); + if (!success) { + newv = oldv; + } + + cpu_stq_data_ra(env, a0 + 0, int128_getlo(newv), ra); + cpu_stq_data_ra(env, a0 + 8, int128_gethi(newv), ra); + + if (success) { + eflags |= CC_Z; + } else { + env->regs[R_EAX] = int128_getlo(oldv); + env->regs[R_EDX] = int128_gethi(oldv); + eflags &= ~CC_Z; + } + CC_SRC = eflags; +} + +void helper_cmpxchg16b(CPUX86State *env, target_ulong a0) +{ + uintptr_t ra = GETPC(); + + if ((a0 & 0xf) != 0) { + raise_exception_ra(env, EXCP0D_GPF, ra); + } else { +#ifndef CONFIG_ATOMIC128 + cpu_loop_exit_atomic(ENV_GET_CPU(env), ra); +#else + int eflags = cpu_cc_compute_all(env, CC_OP); + + Int128 cmpv = int128_make128(env->regs[R_EAX], env->regs[R_EDX]); + Int128 newv = int128_make128(env->regs[R_EBX], env->regs[R_ECX]); + + int mem_idx = cpu_mmu_index(env, false); + TCGMemOpIdx oi = make_memop_idx(MO_TEQ | MO_ALIGN_16, mem_idx); + Int128 oldv = helper_atomic_cmpxchgo_le_mmu(env, a0, cmpv, + newv, oi, ra); + + if (int128_eq(oldv, cmpv)) { + eflags |= CC_Z; + } else { + env->regs[R_EAX] = int128_getlo(oldv); + env->regs[R_EDX] = int128_gethi(oldv); + eflags &= ~CC_Z; + } + CC_SRC = eflags; +#endif + } +} +#endif + +void helper_boundw(CPUX86State *env, target_ulong a0, int v) +{ + int low, high; + + low = cpu_ldsw_data_ra(env, a0, GETPC()); + high = cpu_ldsw_data_ra(env, a0 + 2, GETPC()); + v = (int16_t)v; + if (v < low || v > high) { + if (env->hflags & HF_MPX_EN_MASK) { + env->bndcs_regs.sts = 0; + } + raise_exception_ra(env, EXCP05_BOUND, GETPC()); + } +} + +void helper_boundl(CPUX86State *env, target_ulong a0, int v) +{ + int low, high; + + low = cpu_ldl_data_ra(env, a0, GETPC()); + high = cpu_ldl_data_ra(env, a0 + 4, GETPC()); + if (v < low || v > high) { + if (env->hflags & HF_MPX_EN_MASK) { + env->bndcs_regs.sts = 0; + } + raise_exception_ra(env, EXCP05_BOUND, GETPC()); + } +} + +#if !defined(CONFIG_USER_ONLY) +/* 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) + */ +/* XXX: fix it to restore all registers */ +void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type, + int mmu_idx, uintptr_t retaddr) +{ + int ret; + + ret = x86_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx); + if (ret) { + X86CPU *cpu = X86_CPU(cs); + CPUX86State *env = &cpu->env; + + raise_exception_err_ra(env, cs->exception_index, env->error_code, retaddr); + } +} +#endif |