qemu/include/exec/exec-all.h

/*
 * internal execution defines for qemu
 *
 *  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 2.1 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/>.
 */

#ifndef EXEC_ALL_H
#define EXEC_ALL_H

#include "cpu.h"
#if defined(CONFIG_USER_ONLY)
#include "exec/cpu_ldst.h"
#endif
#include "exec/mmu-access-type.h"
#include "exec/translation-block.h"

#if defined(CONFIG_TCG)
#include "accel/tcg/getpc.h"

/**
 * probe_access:
 * @env: CPUArchState
 * @addr: guest virtual address to look up
 * @size: size of the access
 * @access_type: read, write or execute permission
 * @mmu_idx: MMU index to use for lookup
 * @retaddr: return address for unwinding
 *
 * Look up the guest virtual address @addr.  Raise an exception if the
 * page does not satisfy @access_type.  Raise an exception if the
 * access (@addr, @size) hits a watchpoint.  For writes, mark a clean
 * page as dirty.
 *
 * Finally, return the host address for a page that is backed by RAM,
 * or NULL if the page requires I/O.
 */
void *probe_access(CPUArchState *env, vaddr addr, int size,
                   MMUAccessType access_type, int mmu_idx, uintptr_t retaddr);

static inline void *probe_write(CPUArchState *env, vaddr addr, int size,
                                int mmu_idx, uintptr_t retaddr)
{
    return probe_access(env, addr, size, MMU_DATA_STORE, mmu_idx, retaddr);
}

static inline void *probe_read(CPUArchState *env, vaddr addr, int size,
                               int mmu_idx, uintptr_t retaddr)
{
    return probe_access(env, addr, size, MMU_DATA_LOAD, mmu_idx, retaddr);
}

/**
 * probe_access_flags:
 * @env: CPUArchState
 * @addr: guest virtual address to look up
 * @size: size of the access
 * @access_type: read, write or execute permission
 * @mmu_idx: MMU index to use for lookup
 * @nonfault: suppress the fault
 * @phost: return value for host address
 * @retaddr: return address for unwinding
 *
 * Similar to probe_access, loosely returning the TLB_FLAGS_MASK for
 * the page, and storing the host address for RAM in @phost.
 *
 * If @nonfault is set, do not raise an exception but return TLB_INVALID_MASK.
 * Do not handle watchpoints, but include TLB_WATCHPOINT in the returned flags.
 * Do handle clean pages, so exclude TLB_NOTDIRY from the returned flags.
 * For simplicity, all "mmio-like" flags are folded to TLB_MMIO.
 */
int probe_access_flags(CPUArchState *env, vaddr addr, int size,
                       MMUAccessType access_type, int mmu_idx,
                       bool nonfault, void **phost, uintptr_t retaddr);

#ifndef CONFIG_USER_ONLY

/**
 * probe_access_full:
 * Like probe_access_flags, except also return into @pfull.
 *
 * The CPUTLBEntryFull structure returned via @pfull is transient
 * and must be consumed or copied immediately, before any further
 * access or changes to TLB @mmu_idx.
 *
 * This function will not fault if @nonfault is set, but will
 * return TLB_INVALID_MASK if the page is not mapped, or is not
 * accessible with @access_type.
 *
 * This function will return TLB_MMIO in order to force the access
 * to be handled out-of-line if plugins wish to instrument the access.
 */
int probe_access_full(CPUArchState *env, vaddr addr, int size,
                      MMUAccessType access_type, int mmu_idx,
                      bool nonfault, void **phost,
                      CPUTLBEntryFull **pfull, uintptr_t retaddr);

/**
 * probe_access_full_mmu:
 * Like probe_access_full, except:
 *
 * This function is intended to be used for page table accesses by
 * the target mmu itself.  Since such page walking happens while
 * handling another potential mmu fault, this function never raises
 * exceptions (akin to @nonfault true for probe_access_full).
 * Likewise this function does not trigger plugin instrumentation.
 */
int probe_access_full_mmu(CPUArchState *env, vaddr addr, int size,
                          MMUAccessType access_type, int mmu_idx,
                          void **phost, CPUTLBEntryFull **pfull);

#endif /* !CONFIG_USER_ONLY */
#endif /* CONFIG_TCG */

static inline tb_page_addr_t tb_page_addr0(const TranslationBlock *tb)
{
#ifdef CONFIG_USER_ONLY
    return tb->itree.start;
#else
    return tb->page_addr[0];
#endif
}

static inline tb_page_addr_t tb_page_addr1(const TranslationBlock *tb)
{
#ifdef CONFIG_USER_ONLY
    tb_page_addr_t next = tb->itree.last & TARGET_PAGE_MASK;
    return next == (tb->itree.start & TARGET_PAGE_MASK) ? -1 : next;
#else
    return tb->page_addr[1];
#endif
}

static inline void tb_set_page_addr0(TranslationBlock *tb,
                                     tb_page_addr_t addr)
{
#ifdef CONFIG_USER_ONLY
    tb->itree.start = addr;
    /*
     * To begin, we record an interval of one byte.  When the translation
     * loop encounters a second page, the interval will be extended to
     * include the first byte of the second page, which is sufficient to
     * allow tb_page_addr1() above to work properly.  The final corrected
     * interval will be set by tb_page_add() from tb->size before the
     * node is added to the interval tree.
     */
    tb->itree.last = addr;
#else
    tb->page_addr[0] = addr;
#endif
}

static inline void tb_set_page_addr1(TranslationBlock *tb,
                                     tb_page_addr_t addr)
{
#ifdef CONFIG_USER_ONLY
    /* Extend the interval to the first byte of the second page.  See above. */
    tb->itree.last = addr;
#else
    tb->page_addr[1] = addr;
#endif
}

/* TranslationBlock invalidate API */
void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);
void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t last);
void tb_set_jmp_target(TranslationBlock *tb, int n, uintptr_t addr);

#if !defined(CONFIG_USER_ONLY)

/**
 * iotlb_to_section:
 * @cpu: CPU performing the access
 * @index: TCG CPU IOTLB entry
 *
 * Given a TCG CPU IOTLB entry, return the MemoryRegionSection that
 * it refers to. @index will have been initially created and returned
 * by memory_region_section_get_iotlb().
 */
struct MemoryRegionSection *iotlb_to_section(CPUState *cpu,
                                             hwaddr index, MemTxAttrs attrs);
#endif

/**
 * get_page_addr_code_hostp()
 * @env: CPUArchState
 * @addr: guest virtual address of guest code
 *
 * See get_page_addr_code() (full-system version) for documentation on the
 * return value.
 *
 * Sets *@hostp (when @hostp is non-NULL) as follows.
 * If the return value is -1, sets *@hostp to NULL. Otherwise, sets *@hostp
 * to the host address where @addr's content is kept.
 *
 * Note: this function can trigger an exception.
 */
tb_page_addr_t get_page_addr_code_hostp(CPUArchState *env, vaddr addr,
                                        void **hostp);

/**
 * get_page_addr_code()
 * @env: CPUArchState
 * @addr: guest virtual address of guest code
 *
 * If we cannot translate and execute from the entire RAM page, or if
 * the region is not backed by RAM, returns -1. Otherwise, returns the
 * ram_addr_t corresponding to the guest code at @addr.
 *
 * Note: this function can trigger an exception.
 */
static inline tb_page_addr_t get_page_addr_code(CPUArchState *env,
                                                vaddr addr)
{
    return get_page_addr_code_hostp(env, addr, NULL);
}

#if !defined(CONFIG_USER_ONLY)

MemoryRegionSection *
address_space_translate_for_iotlb(CPUState *cpu, int asidx, hwaddr addr,
                                  hwaddr *xlat, hwaddr *plen,
                                  MemTxAttrs attrs, int *prot);
hwaddr memory_region_section_get_iotlb(CPUState *cpu,
                                       MemoryRegionSection *section);
#endif

#endif