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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* guest <-> host helpers.
*
* Copyright (c) 2003 Fabrice Bellard
*/
#ifndef USER_GUEST_HOST_H
#define USER_GUEST_HOST_H
#include "user/abitypes.h"
#include "user/guest-base.h"
#include "cpu.h"
/*
* If non-zero, the guest virtual address space is a contiguous subset
* of the host virtual address space, i.e. '-R reserved_va' is in effect
* either from the command-line or by default. The value is the last
* byte of the guest address space e.g. UINT32_MAX.
*
* If zero, the host and guest virtual address spaces are intermingled.
*/
extern unsigned long reserved_va;
/*
* Limit the guest addresses as best we can.
*
* When not using -R reserved_va, we cannot really limit the guest
* to less address space than the host. For 32-bit guests, this
* acts as a sanity check that we're not giving the guest an address
* that it cannot even represent. For 64-bit guests... the address
* might not be what the real kernel would give, but it is at least
* representable in the guest.
*
* TODO: Improve address allocation to avoid this problem, and to
* avoid setting bits at the top of guest addresses that might need
* to be used for tags.
*/
#define GUEST_ADDR_MAX_ \
((MIN_CONST(TARGET_VIRT_ADDR_SPACE_BITS, TARGET_ABI_BITS) <= 32) ? \
UINT32_MAX : ~0ul)
#define GUEST_ADDR_MAX (reserved_va ? : GUEST_ADDR_MAX_)
#ifndef TARGET_TAGGED_ADDRESSES
static inline abi_ptr cpu_untagged_addr(CPUState *cs, abi_ptr x)
{
return x;
}
#endif
/* All direct uses of g2h and h2g need to go away for usermode softmmu. */
static inline void *g2h_untagged(abi_ptr x)
{
return (void *)((uintptr_t)(x) + guest_base);
}
static inline void *g2h(CPUState *cs, abi_ptr x)
{
return g2h_untagged(cpu_untagged_addr(cs, x));
}
static inline bool guest_addr_valid_untagged(abi_ulong x)
{
return x <= GUEST_ADDR_MAX;
}
static inline bool guest_range_valid_untagged(abi_ulong start, abi_ulong len)
{
return len - 1 <= GUEST_ADDR_MAX && start <= GUEST_ADDR_MAX - len + 1;
}
#define h2g_valid(x) \
(HOST_LONG_BITS <= TARGET_VIRT_ADDR_SPACE_BITS || \
(uintptr_t)(x) - guest_base <= GUEST_ADDR_MAX)
#define h2g_nocheck(x) ({ \
uintptr_t __ret = (uintptr_t)(x) - guest_base; \
(abi_ptr)__ret; \
})
#define h2g(x) ({ \
/* Check if given address fits target address space */ \
assert(h2g_valid(x)); \
h2g_nocheck(x); \
})
#endif
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