| 1 | /*
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| 2 | * Software MMU support
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| 3 | *
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| 4 | * Copyright (c) 2003 Fabrice Bellard
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the GNU Lesser General Public
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| 8 | * License as published by the Free Software Foundation; either
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| 9 | * version 2 of the License, or (at your option) any later version.
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| 10 | *
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| 11 | * This library is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | * Lesser General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU Lesser General Public
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| 17 | * License along with this library; if not, write to the Free Software
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| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 19 | */
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| 20 | #define DATA_SIZE (1 << SHIFT)
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| 21 |
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| 22 | #if DATA_SIZE == 8
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| 23 | #define SUFFIX q
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| 24 | #define USUFFIX q
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| 25 | #define DATA_TYPE uint64_t
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| 26 | #elif DATA_SIZE == 4
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| 27 | #define SUFFIX l
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| 28 | #define USUFFIX l
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| 29 | #define DATA_TYPE uint32_t
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| 30 | #elif DATA_SIZE == 2
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| 31 | #define SUFFIX w
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| 32 | #define USUFFIX uw
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| 33 | #define DATA_TYPE uint16_t
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| 34 | #elif DATA_SIZE == 1
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| 35 | #define SUFFIX b
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| 36 | #define USUFFIX ub
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| 37 | #define DATA_TYPE uint8_t
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| 38 | #else
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| 39 | #error unsupported data size
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| 40 | #endif
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| 41 |
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| 42 | #ifdef SOFTMMU_CODE_ACCESS
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| 43 | #define READ_ACCESS_TYPE 2
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| 44 | #else
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| 45 | #define READ_ACCESS_TYPE 0
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| 46 | #endif
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| 47 |
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| 48 | static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(target_ulong addr,
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| 49 | int is_user,
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| 50 | void *retaddr);
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| 51 | static inline DATA_TYPE glue(io_read, SUFFIX)(unsigned long physaddr,
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| 52 | target_ulong tlb_addr)
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| 53 | {
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| 54 | DATA_TYPE res;
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| 55 | int index;
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| 56 |
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| 57 | index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
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| 58 | #if SHIFT <= 2
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| 59 | res = io_mem_read[index][SHIFT](io_mem_opaque[index], physaddr);
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| 60 | #else
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| 61 | #ifdef TARGET_WORDS_BIGENDIAN
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| 62 | res = (uint64_t)io_mem_read[index][2](io_mem_opaque[index], physaddr) << 32;
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| 63 | res |= io_mem_read[index][2](io_mem_opaque[index], physaddr + 4);
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| 64 | #else
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| 65 | res = io_mem_read[index][2](io_mem_opaque[index], physaddr);
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| 66 | res |= (uint64_t)io_mem_read[index][2](io_mem_opaque[index], physaddr + 4) << 32;
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| 67 | #endif
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| 68 | #endif /* SHIFT > 2 */
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| 69 | return res;
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| 70 | }
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| 71 |
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| 72 | /* handle all cases except unaligned access which span two pages */
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| 73 | DATA_TYPE REGPARM(1) glue(glue(__ld, SUFFIX), MMUSUFFIX)(target_ulong addr,
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| 74 | int is_user)
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| 75 | {
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| 76 | DATA_TYPE res;
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| 77 | int index;
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| 78 | target_ulong tlb_addr;
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| 79 | unsigned long physaddr;
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| 80 | void *retaddr;
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| 81 |
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| 82 | /* test if there is match for unaligned or IO access */
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| 83 | /* XXX: could done more in memory macro in a non portable way */
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| 84 | index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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| 85 | redo:
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| 86 | tlb_addr = env->tlb_read[is_user][index].address;
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| 87 | if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
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| 88 | physaddr = addr + env->tlb_read[is_user][index].addend;
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| 89 | if (tlb_addr & ~TARGET_PAGE_MASK) {
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| 90 | /* IO access */
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| 91 | if ((addr & (DATA_SIZE - 1)) != 0)
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| 92 | goto do_unaligned_access;
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| 93 | res = glue(io_read, SUFFIX)(physaddr, tlb_addr);
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| 94 | } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
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| 95 | /* slow unaligned access (it spans two pages or IO) */
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| 96 | do_unaligned_access:
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| 97 | retaddr = GETPC();
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| 98 | res = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr,
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| 99 | is_user, retaddr);
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| 100 | } else {
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| 101 | /* unaligned access in the same page */
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| 102 | res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)physaddr);
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| 103 | }
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| 104 | } else {
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| 105 | /* the page is not in the TLB : fill it */
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| 106 | retaddr = GETPC();
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| 107 | tlb_fill(addr, READ_ACCESS_TYPE, is_user, retaddr);
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| 108 | goto redo;
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| 109 | }
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| 110 | return res;
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| 111 | }
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| 112 |
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| 113 | /* handle all unaligned cases */
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| 114 | static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(target_ulong addr,
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| 115 | int is_user,
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| 116 | void *retaddr)
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| 117 | {
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| 118 | DATA_TYPE res, res1, res2;
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| 119 | int index, shift;
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| 120 | unsigned long physaddr;
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| 121 | target_ulong tlb_addr, addr1, addr2;
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| 122 |
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| 123 | index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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| 124 | redo:
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| 125 | tlb_addr = env->tlb_read[is_user][index].address;
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| 126 | if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
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| 127 | physaddr = addr + env->tlb_read[is_user][index].addend;
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| 128 | if (tlb_addr & ~TARGET_PAGE_MASK) {
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| 129 | /* IO access */
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| 130 | if ((addr & (DATA_SIZE - 1)) != 0)
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| 131 | goto do_unaligned_access;
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| 132 | res = glue(io_read, SUFFIX)(physaddr, tlb_addr);
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| 133 | } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
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| 134 | do_unaligned_access:
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| 135 | /* slow unaligned access (it spans two pages) */
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| 136 | addr1 = addr & ~(DATA_SIZE - 1);
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| 137 | addr2 = addr1 + DATA_SIZE;
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| 138 | res1 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr1,
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| 139 | is_user, retaddr);
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| 140 | res2 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr2,
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| 141 | is_user, retaddr);
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| 142 | shift = (addr & (DATA_SIZE - 1)) * 8;
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| 143 | #ifdef TARGET_WORDS_BIGENDIAN
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| 144 | res = (res1 << shift) | (res2 >> ((DATA_SIZE * 8) - shift));
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| 145 | #else
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| 146 | res = (res1 >> shift) | (res2 << ((DATA_SIZE * 8) - shift));
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| 147 | #endif
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| 148 | res = (DATA_TYPE)res;
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| 149 | } else {
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| 150 | /* unaligned/aligned access in the same page */
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| 151 | res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)physaddr);
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| 152 | }
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| 153 | } else {
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| 154 | /* the page is not in the TLB : fill it */
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| 155 | tlb_fill(addr, READ_ACCESS_TYPE, is_user, retaddr);
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| 156 | goto redo;
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| 157 | }
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| 158 | return res;
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| 159 | }
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| 160 |
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| 161 | #ifndef SOFTMMU_CODE_ACCESS
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| 162 |
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| 163 | static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(target_ulong addr,
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| 164 | DATA_TYPE val,
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| 165 | int is_user,
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| 166 | void *retaddr);
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| 167 |
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| 168 | static inline void glue(io_write, SUFFIX)(unsigned long physaddr,
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| 169 | DATA_TYPE val,
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| 170 | target_ulong tlb_addr,
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| 171 | void *retaddr)
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| 172 | {
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| 173 | int index;
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| 174 |
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| 175 | index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
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| 176 | env->mem_write_vaddr = tlb_addr;
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| 177 | env->mem_write_pc = (unsigned long)retaddr;
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| 178 | #if SHIFT <= 2
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| 179 | io_mem_write[index][SHIFT](io_mem_opaque[index], physaddr, val);
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| 180 | #else
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| 181 | #ifdef TARGET_WORDS_BIGENDIAN
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| 182 | io_mem_write[index][2](io_mem_opaque[index], physaddr, val >> 32);
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| 183 | io_mem_write[index][2](io_mem_opaque[index], physaddr + 4, val);
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| 184 | #else
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| 185 | io_mem_write[index][2](io_mem_opaque[index], physaddr, val);
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| 186 | io_mem_write[index][2](io_mem_opaque[index], physaddr + 4, val >> 32);
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| 187 | #endif
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| 188 | #endif /* SHIFT > 2 */
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| 189 | }
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| 190 |
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| 191 | void REGPARM(2) glue(glue(__st, SUFFIX), MMUSUFFIX)(target_ulong addr,
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| 192 | DATA_TYPE val,
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| 193 | int is_user)
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| 194 | {
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| 195 | unsigned long physaddr;
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| 196 | target_ulong tlb_addr;
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| 197 | void *retaddr;
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| 198 | int index;
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| 199 |
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| 200 | index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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| 201 | redo:
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| 202 | tlb_addr = env->tlb_write[is_user][index].address;
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| 203 | if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
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| 204 | physaddr = addr + env->tlb_write[is_user][index].addend;
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| 205 | if (tlb_addr & ~TARGET_PAGE_MASK) {
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| 206 | /* IO access */
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| 207 | if ((addr & (DATA_SIZE - 1)) != 0)
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| 208 | goto do_unaligned_access;
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| 209 | retaddr = GETPC();
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| 210 | glue(io_write, SUFFIX)(physaddr, val, tlb_addr, retaddr);
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| 211 | } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
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| 212 | do_unaligned_access:
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| 213 | retaddr = GETPC();
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| 214 | glue(glue(slow_st, SUFFIX), MMUSUFFIX)(addr, val,
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| 215 | is_user, retaddr);
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| 216 | } else {
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| 217 | /* aligned/unaligned access in the same page */
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| 218 | glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val);
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| 219 | }
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| 220 | } else {
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| 221 | /* the page is not in the TLB : fill it */
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| 222 | retaddr = GETPC();
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| 223 | tlb_fill(addr, 1, is_user, retaddr);
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| 224 | goto redo;
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| 225 | }
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| 226 | }
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| 227 |
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| 228 | /* handles all unaligned cases */
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| 229 | static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(target_ulong addr,
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| 230 | DATA_TYPE val,
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| 231 | int is_user,
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| 232 | void *retaddr)
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| 233 | {
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| 234 | unsigned long physaddr;
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| 235 | target_ulong tlb_addr;
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| 236 | int index, i;
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| 237 |
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| 238 | index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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| 239 | redo:
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| 240 | tlb_addr = env->tlb_write[is_user][index].address;
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| 241 | if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
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| 242 | physaddr = addr + env->tlb_write[is_user][index].addend;
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| 243 | if (tlb_addr & ~TARGET_PAGE_MASK) {
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| 244 | /* IO access */
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| 245 | if ((addr & (DATA_SIZE - 1)) != 0)
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| 246 | goto do_unaligned_access;
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| 247 | glue(io_write, SUFFIX)(physaddr, val, tlb_addr, retaddr);
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| 248 | } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
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| 249 | do_unaligned_access:
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| 250 | /* XXX: not efficient, but simple */
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| 251 | for(i = 0;i < DATA_SIZE; i++) {
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| 252 | #ifdef TARGET_WORDS_BIGENDIAN
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| 253 | glue(slow_stb, MMUSUFFIX)(addr + i, val >> (((DATA_SIZE - 1) * 8) - (i * 8)),
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| 254 | is_user, retaddr);
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| 255 | #else
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| 256 | glue(slow_stb, MMUSUFFIX)(addr + i, val >> (i * 8),
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| 257 | is_user, retaddr);
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| 258 | #endif
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| 259 | }
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| 260 | } else {
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| 261 | /* aligned/unaligned access in the same page */
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| 262 | glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val);
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| 263 | }
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| 264 | } else {
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| 265 | /* the page is not in the TLB : fill it */
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| 266 | tlb_fill(addr, 1, is_user, retaddr);
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| 267 | goto redo;
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| 268 | }
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| 269 | }
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| 270 |
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| 271 | #endif /* !defined(SOFTMMU_CODE_ACCESS) */
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| 272 |
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| 273 | #undef READ_ACCESS_TYPE
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| 274 | #undef SHIFT
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| 275 | #undef DATA_TYPE
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| 276 | #undef SUFFIX
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| 277 | #undef USUFFIX
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| 278 | #undef DATA_SIZE
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