| /* |
| * Software MMU support |
| * |
| * Generate helpers used by TCG for qemu_ld/st ops and code load |
| * functions. |
| * |
| * Included from target op helpers and exec.c. |
| * |
| * 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-timer.h" |
| #include "memory.h" |
| |
| #define DATA_SIZE (1 << SHIFT) |
| |
| #if DATA_SIZE == 8 |
| #define SUFFIX q |
| #define USUFFIX q |
| #define DATA_TYPE uint64_t |
| #elif DATA_SIZE == 4 |
| #define SUFFIX l |
| #define USUFFIX l |
| #define DATA_TYPE uint32_t |
| #elif DATA_SIZE == 2 |
| #define SUFFIX w |
| #define USUFFIX uw |
| #define DATA_TYPE uint16_t |
| #elif DATA_SIZE == 1 |
| #define SUFFIX b |
| #define USUFFIX ub |
| #define DATA_TYPE uint8_t |
| #else |
| #error unsupported data size |
| #endif |
| |
| #ifdef SOFTMMU_CODE_ACCESS |
| #define READ_ACCESS_TYPE 2 |
| #define ADDR_READ addr_code |
| #else |
| #define READ_ACCESS_TYPE 0 |
| #define ADDR_READ addr_read |
| #endif |
| |
| static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(CPUArchState *env, |
| target_ulong addr, |
| int mmu_idx, |
| uintptr_t retaddr); |
| static inline DATA_TYPE glue(io_read, SUFFIX)(CPUArchState *env, |
| hwaddr physaddr, |
| target_ulong addr, |
| uintptr_t retaddr) |
| { |
| DATA_TYPE res; |
| MemoryRegion *mr = iotlb_to_region(physaddr); |
| |
| physaddr = (physaddr & TARGET_PAGE_MASK) + addr; |
| env->mem_io_pc = retaddr; |
| if (mr != &io_mem_ram && mr != &io_mem_rom |
| && mr != &io_mem_unassigned |
| && mr != &io_mem_notdirty |
| && !can_do_io(env)) { |
| cpu_io_recompile(env, retaddr); |
| } |
| |
| env->mem_io_vaddr = addr; |
| #if SHIFT <= 2 |
| res = io_mem_read(mr, physaddr, 1 << SHIFT); |
| #else |
| #ifdef TARGET_WORDS_BIGENDIAN |
| res = io_mem_read(mr, physaddr, 4) << 32; |
| res |= io_mem_read(mr, physaddr + 4, 4); |
| #else |
| res = io_mem_read(mr, physaddr, 4); |
| res |= io_mem_read(mr, physaddr + 4, 4) << 32; |
| #endif |
| #endif /* SHIFT > 2 */ |
| return res; |
| } |
| |
| /* handle all cases except unaligned access which span two pages */ |
| DATA_TYPE |
| glue(glue(helper_ld, SUFFIX), MMUSUFFIX)(CPUArchState *env, target_ulong addr, |
| int mmu_idx) |
| { |
| DATA_TYPE res; |
| int index; |
| target_ulong tlb_addr; |
| hwaddr ioaddr; |
| uintptr_t retaddr; |
| |
| /* test if there is match for unaligned or IO access */ |
| /* XXX: could done more in memory macro in a non portable way */ |
| index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
| redo: |
| tlb_addr = env->tlb_table[mmu_idx][index].ADDR_READ; |
| if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { |
| if (tlb_addr & ~TARGET_PAGE_MASK) { |
| /* IO access */ |
| if ((addr & (DATA_SIZE - 1)) != 0) |
| goto do_unaligned_access; |
| retaddr = GETPC_EXT(); |
| ioaddr = env->iotlb[mmu_idx][index]; |
| res = glue(io_read, SUFFIX)(env, ioaddr, addr, retaddr); |
| } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { |
| /* slow unaligned access (it spans two pages or IO) */ |
| do_unaligned_access: |
| retaddr = GETPC_EXT(); |
| #ifdef ALIGNED_ONLY |
| do_unaligned_access(env, addr, READ_ACCESS_TYPE, mmu_idx, retaddr); |
| #endif |
| res = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(env, addr, |
| mmu_idx, retaddr); |
| } else { |
| /* unaligned/aligned access in the same page */ |
| uintptr_t addend; |
| #ifdef ALIGNED_ONLY |
| if ((addr & (DATA_SIZE - 1)) != 0) { |
| retaddr = GETPC_EXT(); |
| do_unaligned_access(env, addr, READ_ACCESS_TYPE, mmu_idx, retaddr); |
| } |
| #endif |
| addend = env->tlb_table[mmu_idx][index].addend; |
| res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)(intptr_t) |
| (addr + addend)); |
| } |
| } else { |
| /* the page is not in the TLB : fill it */ |
| retaddr = GETPC_EXT(); |
| #ifdef ALIGNED_ONLY |
| if ((addr & (DATA_SIZE - 1)) != 0) |
| do_unaligned_access(env, addr, READ_ACCESS_TYPE, mmu_idx, retaddr); |
| #endif |
| tlb_fill(env, addr, READ_ACCESS_TYPE, mmu_idx, retaddr); |
| goto redo; |
| } |
| return res; |
| } |
| |
| /* handle all unaligned cases */ |
| static DATA_TYPE |
| glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(CPUArchState *env, |
| target_ulong addr, |
| int mmu_idx, |
| uintptr_t retaddr) |
| { |
| DATA_TYPE res, res1, res2; |
| int index, shift; |
| hwaddr ioaddr; |
| target_ulong tlb_addr, addr1, addr2; |
| |
| index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
| redo: |
| tlb_addr = env->tlb_table[mmu_idx][index].ADDR_READ; |
| if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { |
| if (tlb_addr & ~TARGET_PAGE_MASK) { |
| /* IO access */ |
| if ((addr & (DATA_SIZE - 1)) != 0) |
| goto do_unaligned_access; |
| ioaddr = env->iotlb[mmu_idx][index]; |
| res = glue(io_read, SUFFIX)(env, ioaddr, addr, retaddr); |
| } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { |
| do_unaligned_access: |
| /* slow unaligned access (it spans two pages) */ |
| addr1 = addr & ~(DATA_SIZE - 1); |
| addr2 = addr1 + DATA_SIZE; |
| res1 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(env, addr1, |
| mmu_idx, retaddr); |
| res2 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(env, addr2, |
| mmu_idx, retaddr); |
| shift = (addr & (DATA_SIZE - 1)) * 8; |
| #ifdef TARGET_WORDS_BIGENDIAN |
| res = (res1 << shift) | (res2 >> ((DATA_SIZE * 8) - shift)); |
| #else |
| res = (res1 >> shift) | (res2 << ((DATA_SIZE * 8) - shift)); |
| #endif |
| res = (DATA_TYPE)res; |
| } else { |
| /* unaligned/aligned access in the same page */ |
| uintptr_t addend = env->tlb_table[mmu_idx][index].addend; |
| res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)(intptr_t) |
| (addr + addend)); |
| } |
| } else { |
| /* the page is not in the TLB : fill it */ |
| tlb_fill(env, addr, READ_ACCESS_TYPE, mmu_idx, retaddr); |
| goto redo; |
| } |
| return res; |
| } |
| |
| #ifndef SOFTMMU_CODE_ACCESS |
| |
| static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(CPUArchState *env, |
| target_ulong addr, |
| DATA_TYPE val, |
| int mmu_idx, |
| uintptr_t retaddr); |
| |
| static inline void glue(io_write, SUFFIX)(CPUArchState *env, |
| hwaddr physaddr, |
| DATA_TYPE val, |
| target_ulong addr, |
| uintptr_t retaddr) |
| { |
| MemoryRegion *mr = iotlb_to_region(physaddr); |
| |
| physaddr = (physaddr & TARGET_PAGE_MASK) + addr; |
| if (mr != &io_mem_ram && mr != &io_mem_rom |
| && mr != &io_mem_unassigned |
| && mr != &io_mem_notdirty |
| && !can_do_io(env)) { |
| cpu_io_recompile(env, retaddr); |
| } |
| |
| env->mem_io_vaddr = addr; |
| env->mem_io_pc = retaddr; |
| #if SHIFT <= 2 |
| io_mem_write(mr, physaddr, val, 1 << SHIFT); |
| #else |
| #ifdef TARGET_WORDS_BIGENDIAN |
| io_mem_write(mr, physaddr, (val >> 32), 4); |
| io_mem_write(mr, physaddr + 4, (uint32_t)val, 4); |
| #else |
| io_mem_write(mr, physaddr, (uint32_t)val, 4); |
| io_mem_write(mr, physaddr + 4, val >> 32, 4); |
| #endif |
| #endif /* SHIFT > 2 */ |
| } |
| |
| void glue(glue(helper_st, SUFFIX), MMUSUFFIX)(CPUArchState *env, |
| target_ulong addr, DATA_TYPE val, |
| int mmu_idx) |
| { |
| hwaddr ioaddr; |
| target_ulong tlb_addr; |
| uintptr_t retaddr; |
| int index; |
| |
| index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
| redo: |
| tlb_addr = env->tlb_table[mmu_idx][index].addr_write; |
| if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { |
| if (tlb_addr & ~TARGET_PAGE_MASK) { |
| /* IO access */ |
| if ((addr & (DATA_SIZE - 1)) != 0) |
| goto do_unaligned_access; |
| retaddr = GETPC_EXT(); |
| ioaddr = env->iotlb[mmu_idx][index]; |
| glue(io_write, SUFFIX)(env, ioaddr, val, addr, retaddr); |
| } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { |
| do_unaligned_access: |
| retaddr = GETPC_EXT(); |
| #ifdef ALIGNED_ONLY |
| do_unaligned_access(env, addr, 1, mmu_idx, retaddr); |
| #endif |
| glue(glue(slow_st, SUFFIX), MMUSUFFIX)(env, addr, val, |
| mmu_idx, retaddr); |
| } else { |
| /* aligned/unaligned access in the same page */ |
| uintptr_t addend; |
| #ifdef ALIGNED_ONLY |
| if ((addr & (DATA_SIZE - 1)) != 0) { |
| retaddr = GETPC_EXT(); |
| do_unaligned_access(env, addr, 1, mmu_idx, retaddr); |
| } |
| #endif |
| addend = env->tlb_table[mmu_idx][index].addend; |
| glue(glue(st, SUFFIX), _raw)((uint8_t *)(intptr_t) |
| (addr + addend), val); |
| } |
| } else { |
| /* the page is not in the TLB : fill it */ |
| retaddr = GETPC_EXT(); |
| #ifdef ALIGNED_ONLY |
| if ((addr & (DATA_SIZE - 1)) != 0) |
| do_unaligned_access(env, addr, 1, mmu_idx, retaddr); |
| #endif |
| tlb_fill(env, addr, 1, mmu_idx, retaddr); |
| goto redo; |
| } |
| } |
| |
| /* handles all unaligned cases */ |
| static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(CPUArchState *env, |
| target_ulong addr, |
| DATA_TYPE val, |
| int mmu_idx, |
| uintptr_t retaddr) |
| { |
| hwaddr ioaddr; |
| target_ulong tlb_addr; |
| int index, i; |
| |
| index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
| redo: |
| tlb_addr = env->tlb_table[mmu_idx][index].addr_write; |
| if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { |
| if (tlb_addr & ~TARGET_PAGE_MASK) { |
| /* IO access */ |
| if ((addr & (DATA_SIZE - 1)) != 0) |
| goto do_unaligned_access; |
| ioaddr = env->iotlb[mmu_idx][index]; |
| glue(io_write, SUFFIX)(env, ioaddr, val, addr, retaddr); |
| } else if (((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) { |
| do_unaligned_access: |
| /* XXX: not efficient, but simple */ |
| /* Note: relies on the fact that tlb_fill() does not remove the |
| * previous page from the TLB cache. */ |
| for(i = DATA_SIZE - 1; i >= 0; i--) { |
| #ifdef TARGET_WORDS_BIGENDIAN |
| glue(slow_stb, MMUSUFFIX)(env, addr + i, |
| val >> (((DATA_SIZE - 1) * 8) - (i * 8)), |
| mmu_idx, retaddr); |
| #else |
| glue(slow_stb, MMUSUFFIX)(env, addr + i, |
| val >> (i * 8), |
| mmu_idx, retaddr); |
| #endif |
| } |
| } else { |
| /* aligned/unaligned access in the same page */ |
| uintptr_t addend = env->tlb_table[mmu_idx][index].addend; |
| glue(glue(st, SUFFIX), _raw)((uint8_t *)(intptr_t) |
| (addr + addend), val); |
| } |
| } else { |
| /* the page is not in the TLB : fill it */ |
| tlb_fill(env, addr, 1, mmu_idx, retaddr); |
| goto redo; |
| } |
| } |
| |
| #endif /* !defined(SOFTMMU_CODE_ACCESS) */ |
| |
| #undef READ_ACCESS_TYPE |
| #undef SHIFT |
| #undef DATA_TYPE |
| #undef SUFFIX |
| #undef USUFFIX |
| #undef DATA_SIZE |
| #undef ADDR_READ |
