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https://github.com/qemu/qemu.git
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3b64349539
Rather than retaining io_mem_read/write as simple wrappers around the memory_region_dispatch_read/write functions, make the latter public and change all the callers to use them, since we need to touch all the callsites anyway to add MemTxAttrs and MemTxResult support. Delete io_mem_read and io_mem_write entirely. (All the callers currently pass MEMTXATTRS_UNSPECIFIED and convert the return value back to bool or ignore it.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
577 lines
20 KiB
C
577 lines
20 KiB
C
/*
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* Software MMU support
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*
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* Generate helpers used by TCG for qemu_ld/st ops and code load
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* functions.
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*
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* Included from target op helpers and exec.c.
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/timer.h"
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#include "exec/address-spaces.h"
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#include "exec/memory.h"
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#define DATA_SIZE (1 << SHIFT)
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#if DATA_SIZE == 8
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#define SUFFIX q
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#define LSUFFIX q
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#define SDATA_TYPE int64_t
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#define DATA_TYPE uint64_t
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#elif DATA_SIZE == 4
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#define SUFFIX l
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#define LSUFFIX l
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#define SDATA_TYPE int32_t
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#define DATA_TYPE uint32_t
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#elif DATA_SIZE == 2
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#define SUFFIX w
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#define LSUFFIX uw
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#define SDATA_TYPE int16_t
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#define DATA_TYPE uint16_t
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#elif DATA_SIZE == 1
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#define SUFFIX b
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#define LSUFFIX ub
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#define SDATA_TYPE int8_t
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#define DATA_TYPE uint8_t
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#else
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#error unsupported data size
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#endif
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/* For the benefit of TCG generated code, we want to avoid the complication
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of ABI-specific return type promotion and always return a value extended
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to the register size of the host. This is tcg_target_long, except in the
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case of a 32-bit host and 64-bit data, and for that we always have
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uint64_t. Don't bother with this widened value for SOFTMMU_CODE_ACCESS. */
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#if defined(SOFTMMU_CODE_ACCESS) || DATA_SIZE == 8
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# define WORD_TYPE DATA_TYPE
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# define USUFFIX SUFFIX
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#else
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# define WORD_TYPE tcg_target_ulong
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# define USUFFIX glue(u, SUFFIX)
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# define SSUFFIX glue(s, SUFFIX)
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#endif
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#ifdef SOFTMMU_CODE_ACCESS
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#define READ_ACCESS_TYPE MMU_INST_FETCH
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#define ADDR_READ addr_code
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#else
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#define READ_ACCESS_TYPE MMU_DATA_LOAD
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#define ADDR_READ addr_read
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#endif
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#if DATA_SIZE == 8
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# define BSWAP(X) bswap64(X)
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#elif DATA_SIZE == 4
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# define BSWAP(X) bswap32(X)
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#elif DATA_SIZE == 2
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# define BSWAP(X) bswap16(X)
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#else
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# define BSWAP(X) (X)
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#endif
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#ifdef TARGET_WORDS_BIGENDIAN
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# define TGT_BE(X) (X)
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# define TGT_LE(X) BSWAP(X)
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#else
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# define TGT_BE(X) BSWAP(X)
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# define TGT_LE(X) (X)
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#endif
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#if DATA_SIZE == 1
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# define helper_le_ld_name glue(glue(helper_ret_ld, USUFFIX), MMUSUFFIX)
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# define helper_be_ld_name helper_le_ld_name
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# define helper_le_lds_name glue(glue(helper_ret_ld, SSUFFIX), MMUSUFFIX)
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# define helper_be_lds_name helper_le_lds_name
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# define helper_le_st_name glue(glue(helper_ret_st, SUFFIX), MMUSUFFIX)
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# define helper_be_st_name helper_le_st_name
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#else
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# define helper_le_ld_name glue(glue(helper_le_ld, USUFFIX), MMUSUFFIX)
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# define helper_be_ld_name glue(glue(helper_be_ld, USUFFIX), MMUSUFFIX)
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# define helper_le_lds_name glue(glue(helper_le_ld, SSUFFIX), MMUSUFFIX)
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# define helper_be_lds_name glue(glue(helper_be_ld, SSUFFIX), MMUSUFFIX)
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# define helper_le_st_name glue(glue(helper_le_st, SUFFIX), MMUSUFFIX)
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# define helper_be_st_name glue(glue(helper_be_st, SUFFIX), MMUSUFFIX)
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#endif
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#ifdef TARGET_WORDS_BIGENDIAN
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# define helper_te_ld_name helper_be_ld_name
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# define helper_te_st_name helper_be_st_name
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#else
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# define helper_te_ld_name helper_le_ld_name
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# define helper_te_st_name helper_le_st_name
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#endif
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/* macro to check the victim tlb */
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#define VICTIM_TLB_HIT(ty) \
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({ \
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/* we are about to do a page table walk. our last hope is the \
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* victim tlb. try to refill from the victim tlb before walking the \
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* page table. */ \
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int vidx; \
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hwaddr tmpiotlb; \
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CPUTLBEntry tmptlb; \
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for (vidx = CPU_VTLB_SIZE-1; vidx >= 0; --vidx) { \
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if (env->tlb_v_table[mmu_idx][vidx].ty == (addr & TARGET_PAGE_MASK)) {\
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/* found entry in victim tlb, swap tlb and iotlb */ \
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tmptlb = env->tlb_table[mmu_idx][index]; \
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env->tlb_table[mmu_idx][index] = env->tlb_v_table[mmu_idx][vidx]; \
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env->tlb_v_table[mmu_idx][vidx] = tmptlb; \
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tmpiotlb = env->iotlb[mmu_idx][index]; \
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env->iotlb[mmu_idx][index] = env->iotlb_v[mmu_idx][vidx]; \
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env->iotlb_v[mmu_idx][vidx] = tmpiotlb; \
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break; \
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} \
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} \
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/* return true when there is a vtlb hit, i.e. vidx >=0 */ \
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vidx >= 0; \
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})
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#ifndef SOFTMMU_CODE_ACCESS
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static inline DATA_TYPE glue(io_read, SUFFIX)(CPUArchState *env,
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hwaddr physaddr,
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target_ulong addr,
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uintptr_t retaddr)
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{
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uint64_t val;
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CPUState *cpu = ENV_GET_CPU(env);
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MemoryRegion *mr = iotlb_to_region(cpu, physaddr);
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physaddr = (physaddr & TARGET_PAGE_MASK) + addr;
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cpu->mem_io_pc = retaddr;
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if (mr != &io_mem_rom && mr != &io_mem_notdirty && !cpu_can_do_io(cpu)) {
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cpu_io_recompile(cpu, retaddr);
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}
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cpu->mem_io_vaddr = addr;
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memory_region_dispatch_read(mr, physaddr, &val, 1 << SHIFT,
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MEMTXATTRS_UNSPECIFIED);
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return val;
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}
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#endif
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#ifdef SOFTMMU_CODE_ACCESS
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static __attribute__((unused))
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#endif
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WORD_TYPE helper_le_ld_name(CPUArchState *env, target_ulong addr, int mmu_idx,
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uintptr_t retaddr)
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{
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int index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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target_ulong tlb_addr = env->tlb_table[mmu_idx][index].ADDR_READ;
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uintptr_t haddr;
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DATA_TYPE res;
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/* Adjust the given return address. */
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retaddr -= GETPC_ADJ;
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/* If the TLB entry is for a different page, reload and try again. */
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if ((addr & TARGET_PAGE_MASK)
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!= (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
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#ifdef ALIGNED_ONLY
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if ((addr & (DATA_SIZE - 1)) != 0) {
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cpu_unaligned_access(ENV_GET_CPU(env), addr, READ_ACCESS_TYPE,
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mmu_idx, retaddr);
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}
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#endif
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if (!VICTIM_TLB_HIT(ADDR_READ)) {
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tlb_fill(ENV_GET_CPU(env), addr, READ_ACCESS_TYPE,
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mmu_idx, retaddr);
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}
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tlb_addr = env->tlb_table[mmu_idx][index].ADDR_READ;
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}
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/* Handle an IO access. */
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if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) {
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hwaddr ioaddr;
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if ((addr & (DATA_SIZE - 1)) != 0) {
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goto do_unaligned_access;
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}
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ioaddr = env->iotlb[mmu_idx][index];
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/* ??? Note that the io helpers always read data in the target
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byte ordering. We should push the LE/BE request down into io. */
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res = glue(io_read, SUFFIX)(env, ioaddr, addr, retaddr);
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res = TGT_LE(res);
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return res;
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}
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/* Handle slow unaligned access (it spans two pages or IO). */
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if (DATA_SIZE > 1
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&& unlikely((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1
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>= TARGET_PAGE_SIZE)) {
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target_ulong addr1, addr2;
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DATA_TYPE res1, res2;
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unsigned shift;
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do_unaligned_access:
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#ifdef ALIGNED_ONLY
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cpu_unaligned_access(ENV_GET_CPU(env), addr, READ_ACCESS_TYPE,
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mmu_idx, retaddr);
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#endif
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addr1 = addr & ~(DATA_SIZE - 1);
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addr2 = addr1 + DATA_SIZE;
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/* Note the adjustment at the beginning of the function.
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Undo that for the recursion. */
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res1 = helper_le_ld_name(env, addr1, mmu_idx, retaddr + GETPC_ADJ);
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res2 = helper_le_ld_name(env, addr2, mmu_idx, retaddr + GETPC_ADJ);
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shift = (addr & (DATA_SIZE - 1)) * 8;
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/* Little-endian combine. */
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res = (res1 >> shift) | (res2 << ((DATA_SIZE * 8) - shift));
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return res;
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}
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/* Handle aligned access or unaligned access in the same page. */
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#ifdef ALIGNED_ONLY
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if ((addr & (DATA_SIZE - 1)) != 0) {
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cpu_unaligned_access(ENV_GET_CPU(env), addr, READ_ACCESS_TYPE,
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mmu_idx, retaddr);
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}
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#endif
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haddr = addr + env->tlb_table[mmu_idx][index].addend;
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#if DATA_SIZE == 1
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res = glue(glue(ld, LSUFFIX), _p)((uint8_t *)haddr);
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#else
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res = glue(glue(ld, LSUFFIX), _le_p)((uint8_t *)haddr);
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#endif
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return res;
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}
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#if DATA_SIZE > 1
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#ifdef SOFTMMU_CODE_ACCESS
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static __attribute__((unused))
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#endif
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WORD_TYPE helper_be_ld_name(CPUArchState *env, target_ulong addr, int mmu_idx,
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uintptr_t retaddr)
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{
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int index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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target_ulong tlb_addr = env->tlb_table[mmu_idx][index].ADDR_READ;
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uintptr_t haddr;
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DATA_TYPE res;
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/* Adjust the given return address. */
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retaddr -= GETPC_ADJ;
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/* If the TLB entry is for a different page, reload and try again. */
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if ((addr & TARGET_PAGE_MASK)
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!= (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
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#ifdef ALIGNED_ONLY
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if ((addr & (DATA_SIZE - 1)) != 0) {
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cpu_unaligned_access(ENV_GET_CPU(env), addr, READ_ACCESS_TYPE,
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mmu_idx, retaddr);
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}
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#endif
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if (!VICTIM_TLB_HIT(ADDR_READ)) {
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tlb_fill(ENV_GET_CPU(env), addr, READ_ACCESS_TYPE,
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mmu_idx, retaddr);
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}
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tlb_addr = env->tlb_table[mmu_idx][index].ADDR_READ;
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}
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/* Handle an IO access. */
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if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) {
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hwaddr ioaddr;
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if ((addr & (DATA_SIZE - 1)) != 0) {
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goto do_unaligned_access;
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}
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ioaddr = env->iotlb[mmu_idx][index];
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/* ??? Note that the io helpers always read data in the target
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byte ordering. We should push the LE/BE request down into io. */
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res = glue(io_read, SUFFIX)(env, ioaddr, addr, retaddr);
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res = TGT_BE(res);
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return res;
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}
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/* Handle slow unaligned access (it spans two pages or IO). */
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if (DATA_SIZE > 1
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&& unlikely((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1
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>= TARGET_PAGE_SIZE)) {
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target_ulong addr1, addr2;
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DATA_TYPE res1, res2;
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unsigned shift;
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do_unaligned_access:
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#ifdef ALIGNED_ONLY
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cpu_unaligned_access(ENV_GET_CPU(env), addr, READ_ACCESS_TYPE,
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mmu_idx, retaddr);
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#endif
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addr1 = addr & ~(DATA_SIZE - 1);
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addr2 = addr1 + DATA_SIZE;
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/* Note the adjustment at the beginning of the function.
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Undo that for the recursion. */
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res1 = helper_be_ld_name(env, addr1, mmu_idx, retaddr + GETPC_ADJ);
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res2 = helper_be_ld_name(env, addr2, mmu_idx, retaddr + GETPC_ADJ);
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shift = (addr & (DATA_SIZE - 1)) * 8;
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/* Big-endian combine. */
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res = (res1 << shift) | (res2 >> ((DATA_SIZE * 8) - shift));
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return res;
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}
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/* Handle aligned access or unaligned access in the same page. */
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#ifdef ALIGNED_ONLY
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if ((addr & (DATA_SIZE - 1)) != 0) {
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cpu_unaligned_access(ENV_GET_CPU(env), addr, READ_ACCESS_TYPE,
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mmu_idx, retaddr);
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}
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#endif
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haddr = addr + env->tlb_table[mmu_idx][index].addend;
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res = glue(glue(ld, LSUFFIX), _be_p)((uint8_t *)haddr);
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return res;
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}
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#endif /* DATA_SIZE > 1 */
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DATA_TYPE
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glue(glue(helper_ld, SUFFIX), MMUSUFFIX)(CPUArchState *env, target_ulong addr,
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int mmu_idx)
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{
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return helper_te_ld_name (env, addr, mmu_idx, GETRA());
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}
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#ifndef SOFTMMU_CODE_ACCESS
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/* Provide signed versions of the load routines as well. We can of course
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avoid this for 64-bit data, or for 32-bit data on 32-bit host. */
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#if DATA_SIZE * 8 < TCG_TARGET_REG_BITS
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WORD_TYPE helper_le_lds_name(CPUArchState *env, target_ulong addr,
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int mmu_idx, uintptr_t retaddr)
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{
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return (SDATA_TYPE)helper_le_ld_name(env, addr, mmu_idx, retaddr);
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}
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# if DATA_SIZE > 1
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WORD_TYPE helper_be_lds_name(CPUArchState *env, target_ulong addr,
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int mmu_idx, uintptr_t retaddr)
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{
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return (SDATA_TYPE)helper_be_ld_name(env, addr, mmu_idx, retaddr);
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}
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# endif
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#endif
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static inline void glue(io_write, SUFFIX)(CPUArchState *env,
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hwaddr physaddr,
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DATA_TYPE val,
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target_ulong addr,
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uintptr_t retaddr)
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{
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CPUState *cpu = ENV_GET_CPU(env);
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MemoryRegion *mr = iotlb_to_region(cpu, physaddr);
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physaddr = (physaddr & TARGET_PAGE_MASK) + addr;
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if (mr != &io_mem_rom && mr != &io_mem_notdirty && !cpu_can_do_io(cpu)) {
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cpu_io_recompile(cpu, retaddr);
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}
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cpu->mem_io_vaddr = addr;
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cpu->mem_io_pc = retaddr;
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memory_region_dispatch_write(mr, physaddr, val, 1 << SHIFT,
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MEMTXATTRS_UNSPECIFIED);
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}
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void helper_le_st_name(CPUArchState *env, target_ulong addr, DATA_TYPE val,
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int mmu_idx, uintptr_t retaddr)
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{
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int index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
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target_ulong tlb_addr = env->tlb_table[mmu_idx][index].addr_write;
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uintptr_t haddr;
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/* Adjust the given return address. */
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retaddr -= GETPC_ADJ;
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/* If the TLB entry is for a different page, reload and try again. */
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if ((addr & TARGET_PAGE_MASK)
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!= (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
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#ifdef ALIGNED_ONLY
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if ((addr & (DATA_SIZE - 1)) != 0) {
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cpu_unaligned_access(ENV_GET_CPU(env), addr, MMU_DATA_STORE,
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mmu_idx, retaddr);
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}
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#endif
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if (!VICTIM_TLB_HIT(addr_write)) {
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tlb_fill(ENV_GET_CPU(env), addr, MMU_DATA_STORE, mmu_idx, retaddr);
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}
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tlb_addr = env->tlb_table[mmu_idx][index].addr_write;
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}
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/* Handle an IO access. */
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if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) {
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hwaddr ioaddr;
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if ((addr & (DATA_SIZE - 1)) != 0) {
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goto do_unaligned_access;
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}
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ioaddr = env->iotlb[mmu_idx][index];
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/* ??? Note that the io helpers always read data in the target
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byte ordering. We should push the LE/BE request down into io. */
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val = TGT_LE(val);
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glue(io_write, SUFFIX)(env, ioaddr, val, addr, retaddr);
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return;
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}
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/* Handle slow unaligned access (it spans two pages or IO). */
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if (DATA_SIZE > 1
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&& unlikely((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1
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>= TARGET_PAGE_SIZE)) {
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int i;
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do_unaligned_access:
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#ifdef ALIGNED_ONLY
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cpu_unaligned_access(ENV_GET_CPU(env), addr, MMU_DATA_STORE,
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mmu_idx, retaddr);
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#endif
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/* XXX: not efficient, but simple */
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/* Note: relies on the fact that tlb_fill() does not remove the
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* previous page from the TLB cache. */
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for (i = DATA_SIZE - 1; i >= 0; i--) {
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/* Little-endian extract. */
|
|
uint8_t val8 = val >> (i * 8);
|
|
/* 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) {
|
|
cpu_unaligned_access(ENV_GET_CPU(env), addr, MMU_DATA_STORE,
|
|
mmu_idx, retaddr);
|
|
}
|
|
#endif
|
|
|
|
haddr = addr + env->tlb_table[mmu_idx][index].addend;
|
|
#if DATA_SIZE == 1
|
|
glue(glue(st, SUFFIX), _p)((uint8_t *)haddr, val);
|
|
#else
|
|
glue(glue(st, SUFFIX), _le_p)((uint8_t *)haddr, val);
|
|
#endif
|
|
}
|
|
|
|
#if DATA_SIZE > 1
|
|
void helper_be_st_name(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) {
|
|
cpu_unaligned_access(ENV_GET_CPU(env), addr, MMU_DATA_STORE,
|
|
mmu_idx, retaddr);
|
|
}
|
|
#endif
|
|
if (!VICTIM_TLB_HIT(addr_write)) {
|
|
tlb_fill(ENV_GET_CPU(env), addr, MMU_DATA_STORE, 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];
|
|
|
|
/* ??? Note that the io helpers always read data in the target
|
|
byte ordering. We should push the LE/BE request down into io. */
|
|
val = TGT_BE(val);
|
|
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
|
|
cpu_unaligned_access(ENV_GET_CPU(env), addr, MMU_DATA_STORE,
|
|
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--) {
|
|
/* Big-endian extract. */
|
|
uint8_t val8 = val >> (((DATA_SIZE - 1) * 8) - (i * 8));
|
|
/* 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) {
|
|
cpu_unaligned_access(ENV_GET_CPU(env), addr, MMU_DATA_STORE,
|
|
mmu_idx, retaddr);
|
|
}
|
|
#endif
|
|
|
|
haddr = addr + env->tlb_table[mmu_idx][index].addend;
|
|
glue(glue(st, SUFFIX), _be_p)((uint8_t *)haddr, val);
|
|
}
|
|
#endif /* DATA_SIZE > 1 */
|
|
|
|
void
|
|
glue(glue(helper_st, SUFFIX), MMUSUFFIX)(CPUArchState *env, target_ulong addr,
|
|
DATA_TYPE val, int mmu_idx)
|
|
{
|
|
helper_te_st_name(env, addr, val, mmu_idx, GETRA());
|
|
}
|
|
|
|
#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
|
|
#undef BSWAP
|
|
#undef TGT_BE
|
|
#undef TGT_LE
|
|
#undef CPU_BE
|
|
#undef CPU_LE
|
|
#undef helper_le_ld_name
|
|
#undef helper_be_ld_name
|
|
#undef helper_le_lds_name
|
|
#undef helper_be_lds_name
|
|
#undef helper_le_st_name
|
|
#undef helper_be_st_name
|
|
#undef helper_te_ld_name
|
|
#undef helper_te_st_name
|