352 lines
12 KiB
C
352 lines
12 KiB
C
#ifndef QEMU_H
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#define QEMU_H
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#include "cpu.h"
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#include "exec/cpu_ldst.h"
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#undef DEBUG_REMAP
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#include "exec/user/abitypes.h"
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#include "syscall_defs.h"
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#include "target_syscall.h"
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/*
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* This is the size of the host kernel's sigset_t, needed where we make
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* direct system calls that take a sigset_t pointer and a size.
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*/
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#define SIGSET_T_SIZE (_NSIG / 8)
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/*
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* This struct is used to hold certain information about the image.
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* Basically, it replicates in user space what would be certain
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* task_struct fields in the kernel
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*/
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struct image_info {
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abi_ulong load_bias;
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abi_ulong load_addr;
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abi_ulong start_code;
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abi_ulong end_code;
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abi_ulong start_data;
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abi_ulong end_data;
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abi_ulong start_brk;
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abi_ulong brk;
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abi_ulong reserve_brk;
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abi_ulong start_mmap;
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abi_ulong start_stack;
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abi_ulong stack_limit;
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abi_ulong entry;
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abi_ulong code_offset;
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abi_ulong data_offset;
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abi_ulong saved_auxv;
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abi_ulong auxv_len;
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abi_ulong argc;
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abi_ulong argv;
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abi_ulong envc;
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abi_ulong envp;
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abi_ulong file_string;
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uint32_t elf_flags;
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int personality;
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abi_ulong alignment;
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bool exec_stack;
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/* Generic semihosting knows about these pointers. */
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abi_ulong arg_strings; /* strings for argv */
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abi_ulong env_strings; /* strings for envp; ends arg_strings */
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/* The fields below are used in FDPIC mode. */
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abi_ulong loadmap_addr;
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uint16_t nsegs;
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void *loadsegs;
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abi_ulong pt_dynamic_addr;
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abi_ulong interpreter_loadmap_addr;
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abi_ulong interpreter_pt_dynamic_addr;
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struct image_info *other_info;
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/* For target-specific processing of NT_GNU_PROPERTY_TYPE_0. */
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uint32_t note_flags;
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#ifdef TARGET_MIPS
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int fp_abi;
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int interp_fp_abi;
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#endif
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};
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#ifdef TARGET_I386
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/* Information about the current linux thread */
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struct vm86_saved_state {
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uint32_t eax; /* return code */
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uint32_t ebx;
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uint32_t ecx;
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uint32_t edx;
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uint32_t esi;
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uint32_t edi;
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uint32_t ebp;
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uint32_t esp;
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uint32_t eflags;
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uint32_t eip;
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uint16_t cs, ss, ds, es, fs, gs;
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};
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#endif
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#if defined(TARGET_ARM) && defined(TARGET_ABI32)
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/* FPU emulator */
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#include "nwfpe/fpa11.h"
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#endif
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struct emulated_sigtable {
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int pending; /* true if signal is pending */
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target_siginfo_t info;
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};
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typedef struct TaskState {
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pid_t ts_tid; /* tid (or pid) of this task */
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#ifdef TARGET_ARM
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# ifdef TARGET_ABI32
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/* FPA state */
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FPA11 fpa;
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# endif
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#endif
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#if defined(TARGET_ARM) || defined(TARGET_RISCV)
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int swi_errno;
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#endif
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#if defined(TARGET_I386) && !defined(TARGET_X86_64)
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abi_ulong target_v86;
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struct vm86_saved_state vm86_saved_regs;
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struct target_vm86plus_struct vm86plus;
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uint32_t v86flags;
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uint32_t v86mask;
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#endif
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abi_ulong child_tidptr;
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#ifdef TARGET_M68K
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abi_ulong tp_value;
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#endif
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#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_RISCV)
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/* Extra fields for semihosted binaries. */
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abi_ulong heap_base;
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abi_ulong heap_limit;
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#endif
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abi_ulong stack_base;
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int used; /* non zero if used */
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struct image_info *info;
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struct linux_binprm *bprm;
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struct emulated_sigtable sync_signal;
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struct emulated_sigtable sigtab[TARGET_NSIG];
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/*
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* This thread's signal mask, as requested by the guest program.
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* The actual signal mask of this thread may differ:
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* + we don't let SIGSEGV and SIGBUS be blocked while running guest code
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* + sometimes we block all signals to avoid races
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*/
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sigset_t signal_mask;
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/*
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* The signal mask imposed by a guest sigsuspend syscall, if we are
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* currently in the middle of such a syscall
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*/
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sigset_t sigsuspend_mask;
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/* Nonzero if we're leaving a sigsuspend and sigsuspend_mask is valid. */
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int in_sigsuspend;
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/*
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* Nonzero if process_pending_signals() needs to do something (either
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* handle a pending signal or unblock signals).
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* This flag is written from a signal handler so should be accessed via
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* the qatomic_read() and qatomic_set() functions. (It is not accessed
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* from multiple threads.)
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*/
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int signal_pending;
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/* This thread's sigaltstack, if it has one */
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struct target_sigaltstack sigaltstack_used;
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/* Start time of task after system boot in clock ticks */
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uint64_t start_boottime;
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} TaskState;
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abi_long do_brk(abi_ulong new_brk);
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/* user access */
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#define VERIFY_READ PAGE_READ
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#define VERIFY_WRITE (PAGE_READ | PAGE_WRITE)
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static inline bool access_ok_untagged(int type, abi_ulong addr, abi_ulong size)
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{
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if (size == 0
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? !guest_addr_valid_untagged(addr)
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: !guest_range_valid_untagged(addr, size)) {
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return false;
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}
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return page_check_range((target_ulong)addr, size, type) == 0;
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}
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static inline bool access_ok(CPUState *cpu, int type,
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abi_ulong addr, abi_ulong size)
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{
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return access_ok_untagged(type, cpu_untagged_addr(cpu, addr), size);
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}
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/* NOTE __get_user and __put_user use host pointers and don't check access.
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These are usually used to access struct data members once the struct has
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been locked - usually with lock_user_struct. */
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/*
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* Tricky points:
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* - Use __builtin_choose_expr to avoid type promotion from ?:,
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* - Invalid sizes result in a compile time error stemming from
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* the fact that abort has no parameters.
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* - It's easier to use the endian-specific unaligned load/store
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* functions than host-endian unaligned load/store plus tswapN.
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* - The pragmas are necessary only to silence a clang false-positive
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* warning: see https://bugs.llvm.org/show_bug.cgi?id=39113 .
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* - gcc has bugs in its _Pragma() support in some versions, eg
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* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83256 -- so we only
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* include the warning-suppression pragmas for clang
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*/
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#if defined(__clang__) && __has_warning("-Waddress-of-packed-member")
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#define PRAGMA_DISABLE_PACKED_WARNING \
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_Pragma("GCC diagnostic push"); \
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_Pragma("GCC diagnostic ignored \"-Waddress-of-packed-member\"")
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#define PRAGMA_REENABLE_PACKED_WARNING \
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_Pragma("GCC diagnostic pop")
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#else
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#define PRAGMA_DISABLE_PACKED_WARNING
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#define PRAGMA_REENABLE_PACKED_WARNING
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#endif
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#define __put_user_e(x, hptr, e) \
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do { \
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PRAGMA_DISABLE_PACKED_WARNING; \
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(__builtin_choose_expr(sizeof(*(hptr)) == 1, stb_p, \
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__builtin_choose_expr(sizeof(*(hptr)) == 2, stw_##e##_p, \
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__builtin_choose_expr(sizeof(*(hptr)) == 4, stl_##e##_p, \
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__builtin_choose_expr(sizeof(*(hptr)) == 8, stq_##e##_p, abort)))) \
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((hptr), (x)), (void)0); \
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PRAGMA_REENABLE_PACKED_WARNING; \
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} while (0)
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#define __get_user_e(x, hptr, e) \
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do { \
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PRAGMA_DISABLE_PACKED_WARNING; \
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((x) = (typeof(*hptr))( \
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__builtin_choose_expr(sizeof(*(hptr)) == 1, ldub_p, \
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__builtin_choose_expr(sizeof(*(hptr)) == 2, lduw_##e##_p, \
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__builtin_choose_expr(sizeof(*(hptr)) == 4, ldl_##e##_p, \
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__builtin_choose_expr(sizeof(*(hptr)) == 8, ldq_##e##_p, abort)))) \
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(hptr)), (void)0); \
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PRAGMA_REENABLE_PACKED_WARNING; \
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} while (0)
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#if TARGET_BIG_ENDIAN
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# define __put_user(x, hptr) __put_user_e(x, hptr, be)
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# define __get_user(x, hptr) __get_user_e(x, hptr, be)
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#else
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# define __put_user(x, hptr) __put_user_e(x, hptr, le)
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# define __get_user(x, hptr) __get_user_e(x, hptr, le)
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#endif
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/* put_user()/get_user() take a guest address and check access */
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/* These are usually used to access an atomic data type, such as an int,
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* that has been passed by address. These internally perform locking
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* and unlocking on the data type.
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*/
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#define put_user(x, gaddr, target_type) \
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({ \
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abi_ulong __gaddr = (gaddr); \
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target_type *__hptr; \
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abi_long __ret = 0; \
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if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
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__put_user((x), __hptr); \
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unlock_user(__hptr, __gaddr, sizeof(target_type)); \
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} else \
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__ret = -TARGET_EFAULT; \
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__ret; \
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})
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#define get_user(x, gaddr, target_type) \
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({ \
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abi_ulong __gaddr = (gaddr); \
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target_type *__hptr; \
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abi_long __ret = 0; \
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if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
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__get_user((x), __hptr); \
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unlock_user(__hptr, __gaddr, 0); \
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} else { \
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/* avoid warning */ \
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(x) = 0; \
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__ret = -TARGET_EFAULT; \
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} \
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__ret; \
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})
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#define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
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#define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
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#define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
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#define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
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#define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
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#define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
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#define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
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#define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
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#define put_user_u8(x, gaddr) put_user((x), (gaddr), uint8_t)
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#define put_user_s8(x, gaddr) put_user((x), (gaddr), int8_t)
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#define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
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#define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
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#define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
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#define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
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#define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
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#define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
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#define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
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#define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
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#define get_user_u8(x, gaddr) get_user((x), (gaddr), uint8_t)
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#define get_user_s8(x, gaddr) get_user((x), (gaddr), int8_t)
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/* copy_from_user() and copy_to_user() are usually used to copy data
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* buffers between the target and host. These internally perform
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* locking/unlocking of the memory.
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*/
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int copy_from_user(void *hptr, abi_ulong gaddr, ssize_t len);
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int copy_to_user(abi_ulong gaddr, void *hptr, ssize_t len);
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/* Functions for accessing guest memory. The tget and tput functions
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read/write single values, byteswapping as necessary. The lock_user function
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gets a pointer to a contiguous area of guest memory, but does not perform
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any byteswapping. lock_user may return either a pointer to the guest
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memory, or a temporary buffer. */
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/* Lock an area of guest memory into the host. If copy is true then the
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host area will have the same contents as the guest. */
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void *lock_user(int type, abi_ulong guest_addr, ssize_t len, bool copy);
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/* Unlock an area of guest memory. The first LEN bytes must be
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flushed back to guest memory. host_ptr = NULL is explicitly
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allowed and does nothing. */
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#ifndef DEBUG_REMAP
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static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
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ssize_t len)
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{
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/* no-op */
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}
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#else
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void unlock_user(void *host_ptr, abi_ulong guest_addr, ssize_t len);
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#endif
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/* Return the length of a string in target memory or -TARGET_EFAULT if
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access error. */
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ssize_t target_strlen(abi_ulong gaddr);
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/* Like lock_user but for null terminated strings. */
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void *lock_user_string(abi_ulong guest_addr);
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/* Helper macros for locking/unlocking a target struct. */
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#define lock_user_struct(type, host_ptr, guest_addr, copy) \
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(host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
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#define unlock_user_struct(host_ptr, guest_addr, copy) \
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unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
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#endif /* QEMU_H */
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