| /* |
| * 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 "exec/memory.h" |
| |
| #define DATA_SIZE (1 << SHIFT) |
| |
| #if DATA_SIZE == 8 |
| #define SUFFIX q |
| #define LSUFFIX q |
| #define SDATA_TYPE int64_t |
| #elif DATA_SIZE == 4 |
| #define SUFFIX l |
| #define LSUFFIX l |
| #define SDATA_TYPE int32_t |
| #elif DATA_SIZE == 2 |
| #define SUFFIX w |
| #define LSUFFIX uw |
| #define SDATA_TYPE int16_t |
| #elif DATA_SIZE == 1 |
| #define SUFFIX b |
| #define LSUFFIX ub |
| #define SDATA_TYPE int8_t |
| #else |
| #error unsupported data size |
| #endif |
| |
| #define DATA_TYPE glue(u, SDATA_TYPE) |
| |
| /* For the benefit of TCG generated code, we want to avoid the complication |
| of ABI-specific return type promotion and always return a value extended |
| to the register size of the host. This is tcg_target_long, except in the |
| case of a 32-bit host and 64-bit data, and for that we always have |
| uint64_t. Don't bother with this widened value for SOFTMMU_CODE_ACCESS. */ |
| #if defined(SOFTMMU_CODE_ACCESS) || DATA_SIZE == 8 |
| # define WORD_TYPE DATA_TYPE |
| # define USUFFIX SUFFIX |
| #else |
| # define WORD_TYPE tcg_target_ulong |
| # define USUFFIX glue(u, SUFFIX) |
| # define SSUFFIX glue(s, SUFFIX) |
| #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 inline DATA_TYPE glue(io_read, SUFFIX)(CPUArchState *env, |
| hwaddr physaddr, |
| target_ulong addr, |
| uintptr_t retaddr) |
| { |
| uint64_t val; |
| MemoryRegion *mr = iotlb_to_region(physaddr); |
| |
| physaddr = (physaddr & TARGET_PAGE_MASK) + addr; |
| env->mem_io_pc = retaddr; |
| if (mr != &io_mem_rom && mr != &io_mem_notdirty && !can_do_io(env)) { |
| cpu_io_recompile(env, retaddr); |
| } |
| |
| env->mem_io_vaddr = addr; |
| io_mem_read(mr, physaddr, &val, 1 << SHIFT); |
| return val; |
| } |
| |
| /* handle all cases except unaligned access which span two pages */ |
| #ifdef SOFTMMU_CODE_ACCESS |
| static |
| #endif |
| WORD_TYPE |
| glue(glue(helper_ret_ld, USUFFIX), MMUSUFFIX)(CPUArchState *env, |
| target_ulong addr, int mmu_idx, |
| uintptr_t retaddr) |
| { |
| int index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
| target_ulong tlb_addr = env->tlb_table[mmu_idx][index].ADDR_READ; |
| uintptr_t haddr; |
| |
| /* Adjust the given return address. */ |
| retaddr -= GETPC_ADJ; |
| |
| /* If the TLB entry is for a different page, reload and try again. */ |
| if ((addr & TARGET_PAGE_MASK) |
| != (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { |
| #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); |
| tlb_addr = env->tlb_table[mmu_idx][index].ADDR_READ; |
| } |
| |
| /* Handle an IO access. */ |
| if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) { |
| hwaddr ioaddr; |
| if ((addr & (DATA_SIZE - 1)) != 0) { |
| goto do_unaligned_access; |
| } |
| ioaddr = env->iotlb[mmu_idx][index]; |
| return glue(io_read, SUFFIX)(env, ioaddr, addr, retaddr); |
| } |
| |
| /* Handle slow unaligned access (it spans two pages or IO). */ |
| if (DATA_SIZE > 1 |
| && unlikely((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1 |
| >= TARGET_PAGE_SIZE)) { |
| target_ulong addr1, addr2; |
| DATA_TYPE res1, res2, res; |
| unsigned shift; |
| do_unaligned_access: |
| #ifdef ALIGNED_ONLY |
| do_unaligned_access(env, addr, READ_ACCESS_TYPE, mmu_idx, retaddr); |
| #endif |
| addr1 = addr & ~(DATA_SIZE - 1); |
| addr2 = addr1 + DATA_SIZE; |
| /* Note the adjustment at the beginning of the function. |
| Undo that for the recursion. */ |
| res1 = glue(glue(helper_ret_ld, USUFFIX), MMUSUFFIX) |
| (env, addr1, mmu_idx, retaddr + GETPC_ADJ); |
| res2 = glue(glue(helper_ret_ld, USUFFIX), MMUSUFFIX) |
| (env, addr2, mmu_idx, retaddr + GETPC_ADJ); |
| 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 |
| return res; |
| } |
| |
| /* Handle aligned access or unaligned access in the same page. */ |
| #ifdef ALIGNED_ONLY |
| if ((addr & (DATA_SIZE - 1)) != 0) { |
| do_unaligned_access(env, addr, READ_ACCESS_TYPE, mmu_idx, retaddr); |
| } |
| #endif |
| |
| haddr = addr + env->tlb_table[mmu_idx][index].addend; |
| /* Note that ldl_raw is defined with type "int". */ |
| return (DATA_TYPE) glue(glue(ld, LSUFFIX), _raw)((uint8_t *)haddr); |
| } |
| |
| DATA_TYPE |
| glue(glue(helper_ld, SUFFIX), MMUSUFFIX)(CPUArchState *env, target_ulong addr, |
| int mmu_idx) |
| { |
| return glue(glue(helper_ret_ld, USUFFIX), MMUSUFFIX)(env, addr, mmu_idx, |
| GETRA_EXT()); |
| } |
| |
| #ifndef SOFTMMU_CODE_ACCESS |
| |
| /* Provide signed versions of the load routines as well. We can of course |
| avoid this for 64-bit data, or for 32-bit data on 32-bit host. */ |
| #if DATA_SIZE * 8 < TCG_TARGET_REG_BITS |
| WORD_TYPE |
| glue(glue(helper_ret_ld, SSUFFIX), MMUSUFFIX)(CPUArchState *env, |
| target_ulong addr, int mmu_idx, |
| uintptr_t retaddr) |
| { |
| return (SDATA_TYPE) glue(glue(helper_ret_ld, USUFFIX), MMUSUFFIX) |
| (env, addr, mmu_idx, retaddr); |
| } |
| #endif |
| |
| 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_rom && mr != &io_mem_notdirty && !can_do_io(env)) { |
| cpu_io_recompile(env, retaddr); |
| } |
| |
| env->mem_io_vaddr = addr; |
| env->mem_io_pc = retaddr; |
| io_mem_write(mr, physaddr, val, 1 << SHIFT); |
| } |
| |
| void |
| glue(glue(helper_ret_st, SUFFIX), MMUSUFFIX)(CPUArchState *env, |
| target_ulong addr, DATA_TYPE val, |
| int mmu_idx, uintptr_t retaddr) |
| { |
| int index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); |
| target_ulong tlb_addr = env->tlb_table[mmu_idx][index].addr_write; |
| uintptr_t haddr; |
| |
| /* Adjust the given return address. */ |
| retaddr -= GETPC_ADJ; |
| |
| /* If the TLB entry is for a different page, reload and try again. */ |
| if ((addr & TARGET_PAGE_MASK) |
| != (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { |
| #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); |
| tlb_addr = env->tlb_table[mmu_idx][index].addr_write; |
| } |
| |
| /* Handle an IO access. */ |
| if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) { |
| hwaddr ioaddr; |
| 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); |
| return; |
| } |
| |
| /* Handle slow unaligned access (it spans two pages or IO). */ |
| if (DATA_SIZE > 1 |
| && unlikely((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1 |
| >= TARGET_PAGE_SIZE)) { |
| int i; |
| do_unaligned_access: |
| #ifdef ALIGNED_ONLY |
| do_unaligned_access(env, addr, 1, mmu_idx, retaddr); |
| #endif |
| /* 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 |
| uint8_t val8 = val >> (((DATA_SIZE - 1) * 8) - (i * 8)); |
| #else |
| uint8_t val8 = val >> (i * 8); |
| #endif |
| /* Note the adjustment at the beginning of the function. |
| Undo that for the recursion. */ |
| glue(helper_ret_stb, MMUSUFFIX)(env, addr + i, val8, |
| mmu_idx, retaddr + GETPC_ADJ); |
| } |
| return; |
| } |
| |
| /* Handle aligned access or unaligned access in the same page. */ |
| #ifdef ALIGNED_ONLY |
| if ((addr & (DATA_SIZE - 1)) != 0) { |
| do_unaligned_access(env, addr, 1, mmu_idx, retaddr); |
| } |
| #endif |
| |
| haddr = addr + env->tlb_table[mmu_idx][index].addend; |
| glue(glue(st, SUFFIX), _raw)((uint8_t *)haddr, val); |
| } |
| |
| void |
| glue(glue(helper_st, SUFFIX), MMUSUFFIX)(CPUArchState *env, target_ulong addr, |
| DATA_TYPE val, int mmu_idx) |
| { |
| glue(glue(helper_ret_st, SUFFIX), MMUSUFFIX)(env, addr, val, mmu_idx, |
| GETRA_EXT()); |
| } |
| |
| #endif /* !defined(SOFTMMU_CODE_ACCESS) */ |
| |
| #undef READ_ACCESS_TYPE |
| #undef SHIFT |
| #undef DATA_TYPE |
| #undef SUFFIX |
| #undef LSUFFIX |
| #undef DATA_SIZE |
| #undef ADDR_READ |
| #undef WORD_TYPE |
| #undef SDATA_TYPE |
| #undef USUFFIX |
| #undef SSUFFIX |
