diff options
Diffstat (limited to 'linux-user/qemu.h')
| -rw-r--r-- | linux-user/qemu.h | 429 |
1 files changed, 16 insertions, 413 deletions
diff --git a/linux-user/qemu.h b/linux-user/qemu.h index 3b0b6b7..5c713fa 100644 --- a/linux-user/qemu.h +++ b/linux-user/qemu.h @@ -1,26 +1,24 @@ #ifndef QEMU_H #define QEMU_H -#include "hostdep.h" #include "cpu.h" -#include "exec/exec-all.h" #include "exec/cpu_ldst.h" #undef DEBUG_REMAP #include "exec/user/abitypes.h" -#include "exec/user/thunk.h" #include "syscall_defs.h" #include "target_syscall.h" -#include "exec/gdbstub.h" -/* This is the size of the host kernel's sigset_t, needed where we make +/* + * This is the size of the host kernel's sigset_t, needed where we make * direct system calls that take a sigset_t pointer and a size. */ #define SIGSET_T_SIZE (_NSIG / 8) -/* This struct is used to hold certain information about the image. +/* + * This struct is used to hold certain information about the image. * Basically, it replicates in user space what would be certain * task_struct fields in the kernel */ @@ -48,13 +46,13 @@ struct image_info { abi_ulong env_strings; abi_ulong file_string; uint32_t elf_flags; - int personality; + int personality; abi_ulong alignment; /* The fields below are used in FDPIC mode. */ abi_ulong loadmap_addr; uint16_t nsegs; - void *loadsegs; + void *loadsegs; abi_ulong pt_dynamic_addr; abi_ulong interpreter_loadmap_addr; abi_ulong interpreter_pt_dynamic_addr; @@ -98,8 +96,10 @@ struct emulated_sigtable { target_siginfo_t info; }; -/* NOTE: we force a big alignment so that the stack stored after is - aligned too */ +/* + * NOTE: we force a big alignment so that the stack stored after is + * aligned too + */ typedef struct TaskState { pid_t ts_tid; /* tid (or pid) of this task */ #ifdef TARGET_ARM @@ -134,20 +134,23 @@ typedef struct TaskState { struct emulated_sigtable sync_signal; struct emulated_sigtable sigtab[TARGET_NSIG]; - /* This thread's signal mask, as requested by the guest program. + /* + * This thread's signal mask, as requested by the guest program. * The actual signal mask of this thread may differ: * + we don't let SIGSEGV and SIGBUS be blocked while running guest code * + sometimes we block all signals to avoid races */ sigset_t signal_mask; - /* The signal mask imposed by a guest sigsuspend syscall, if we are + /* + * The signal mask imposed by a guest sigsuspend syscall, if we are * currently in the middle of such a syscall */ sigset_t sigsuspend_mask; /* Nonzero if we're leaving a sigsuspend and sigsuspend_mask is valid. */ int in_sigsuspend; - /* Nonzero if process_pending_signals() needs to do something (either + /* + * Nonzero if process_pending_signals() needs to do something (either * handle a pending signal or unblock signals). * This flag is written from a signal handler so should be accessed via * the qatomic_read() and qatomic_set() functions. (It is not accessed @@ -159,331 +162,7 @@ typedef struct TaskState { struct target_sigaltstack sigaltstack_used; } __attribute__((aligned(16))) TaskState; -extern char *exec_path; -void init_task_state(TaskState *ts); -void task_settid(TaskState *); -void stop_all_tasks(void); -extern const char *qemu_uname_release; -extern unsigned long mmap_min_addr; - -/* ??? See if we can avoid exposing so much of the loader internals. */ - -/* Read a good amount of data initially, to hopefully get all the - program headers loaded. */ -#define BPRM_BUF_SIZE 1024 - -/* - * This structure is used to hold the arguments that are - * used when loading binaries. - */ -struct linux_binprm { - char buf[BPRM_BUF_SIZE] __attribute__((aligned)); - abi_ulong p; - int fd; - int e_uid, e_gid; - int argc, envc; - char **argv; - char **envp; - char * filename; /* Name of binary */ - int (*core_dump)(int, const CPUArchState *); /* coredump routine */ -}; - -typedef struct IOCTLEntry IOCTLEntry; - -typedef abi_long do_ioctl_fn(const IOCTLEntry *ie, uint8_t *buf_temp, - int fd, int cmd, abi_long arg); - -struct IOCTLEntry { - int target_cmd; - unsigned int host_cmd; - const char *name; - int access; - do_ioctl_fn *do_ioctl; - const argtype arg_type[5]; -}; - -extern IOCTLEntry ioctl_entries[]; - -#define IOC_R 0x0001 -#define IOC_W 0x0002 -#define IOC_RW (IOC_R | IOC_W) - -void do_init_thread(struct target_pt_regs *regs, struct image_info *infop); -abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp, - abi_ulong stringp, int push_ptr); -int loader_exec(int fdexec, const char *filename, char **argv, char **envp, - struct target_pt_regs * regs, struct image_info *infop, - struct linux_binprm *); - -/* Returns true if the image uses the FDPIC ABI. If this is the case, - * we have to provide some information (loadmap, pt_dynamic_info) such - * that the program can be relocated adequately. This is also useful - * when handling signals. - */ -int info_is_fdpic(struct image_info *info); - -uint32_t get_elf_eflags(int fd); -int load_elf_binary(struct linux_binprm *bprm, struct image_info *info); -int load_flt_binary(struct linux_binprm *bprm, struct image_info *info); - -abi_long memcpy_to_target(abi_ulong dest, const void *src, - unsigned long len); -void target_set_brk(abi_ulong new_brk); abi_long do_brk(abi_ulong new_brk); -void syscall_init(void); -abi_long do_syscall(void *cpu_env, int num, abi_long arg1, - abi_long arg2, abi_long arg3, abi_long arg4, - abi_long arg5, abi_long arg6, abi_long arg7, - abi_long arg8); -extern __thread CPUState *thread_cpu; -void cpu_loop(CPUArchState *env); -const char *target_strerror(int err); -int get_osversion(void); -void init_qemu_uname_release(void); -void fork_start(void); -void fork_end(int child); - -/** - * probe_guest_base: - * @image_name: the executable being loaded - * @loaddr: the lowest fixed address in the executable - * @hiaddr: the highest fixed address in the executable - * - * Creates the initial guest address space in the host memory space. - * - * If @loaddr == 0, then no address in the executable is fixed, - * i.e. it is fully relocatable. In that case @hiaddr is the size - * of the executable. - * - * This function will not return if a valid value for guest_base - * cannot be chosen. On return, the executable loader can expect - * - * target_mmap(loaddr, hiaddr - loaddr, ...) - * - * to succeed. - */ -void probe_guest_base(const char *image_name, - abi_ulong loaddr, abi_ulong hiaddr); - -#include "qemu/log.h" - -/* safe_syscall.S */ - -/** - * safe_syscall: - * @int number: number of system call to make - * ...: arguments to the system call - * - * Call a system call if guest signal not pending. - * This has the same API as the libc syscall() function, except that it - * may return -1 with errno == TARGET_ERESTARTSYS if a signal was pending. - * - * Returns: the system call result, or -1 with an error code in errno - * (Errnos are host errnos; we rely on TARGET_ERESTARTSYS not clashing - * with any of the host errno values.) - */ - -/* A guide to using safe_syscall() to handle interactions between guest - * syscalls and guest signals: - * - * Guest syscalls come in two flavours: - * - * (1) Non-interruptible syscalls - * - * These are guest syscalls that never get interrupted by signals and - * so never return EINTR. They can be implemented straightforwardly in - * QEMU: just make sure that if the implementation code has to make any - * blocking calls that those calls are retried if they return EINTR. - * It's also OK to implement these with safe_syscall, though it will be - * a little less efficient if a signal is delivered at the 'wrong' moment. - * - * Some non-interruptible syscalls need to be handled using block_signals() - * to block signals for the duration of the syscall. This mainly applies - * to code which needs to modify the data structures used by the - * host_signal_handler() function and the functions it calls, including - * all syscalls which change the thread's signal mask. - * - * (2) Interruptible syscalls - * - * These are guest syscalls that can be interrupted by signals and - * for which we need to either return EINTR or arrange for the guest - * syscall to be restarted. This category includes both syscalls which - * always restart (and in the kernel return -ERESTARTNOINTR), ones - * which only restart if there is no handler (kernel returns -ERESTARTNOHAND - * or -ERESTART_RESTARTBLOCK), and the most common kind which restart - * if the handler was registered with SA_RESTART (kernel returns - * -ERESTARTSYS). System calls which are only interruptible in some - * situations (like 'open') also need to be handled this way. - * - * Here it is important that the host syscall is made - * via this safe_syscall() function, and *not* via the host libc. - * If the host libc is used then the implementation will appear to work - * most of the time, but there will be a race condition where a - * signal could arrive just before we make the host syscall inside libc, - * and then then guest syscall will not correctly be interrupted. - * Instead the implementation of the guest syscall can use the safe_syscall - * function but otherwise just return the result or errno in the usual - * way; the main loop code will take care of restarting the syscall - * if appropriate. - * - * (If the implementation needs to make multiple host syscalls this is - * OK; any which might really block must be via safe_syscall(); for those - * which are only technically blocking (ie which we know in practice won't - * stay in the host kernel indefinitely) it's OK to use libc if necessary. - * You must be able to cope with backing out correctly if some safe_syscall - * you make in the implementation returns either -TARGET_ERESTARTSYS or - * EINTR though.) - * - * block_signals() cannot be used for interruptible syscalls. - * - * - * How and why the safe_syscall implementation works: - * - * The basic setup is that we make the host syscall via a known - * section of host native assembly. If a signal occurs, our signal - * handler checks the interrupted host PC against the addresse of that - * known section. If the PC is before or at the address of the syscall - * instruction then we change the PC to point at a "return - * -TARGET_ERESTARTSYS" code path instead, and then exit the signal handler - * (causing the safe_syscall() call to immediately return that value). - * Then in the main.c loop if we see this magic return value we adjust - * the guest PC to wind it back to before the system call, and invoke - * the guest signal handler as usual. - * - * This winding-back will happen in two cases: - * (1) signal came in just before we took the host syscall (a race); - * in this case we'll take the guest signal and have another go - * at the syscall afterwards, and this is indistinguishable for the - * guest from the timing having been different such that the guest - * signal really did win the race - * (2) signal came in while the host syscall was blocking, and the - * host kernel decided the syscall should be restarted; - * in this case we want to restart the guest syscall also, and so - * rewinding is the right thing. (Note that "restart" semantics mean - * "first call the signal handler, then reattempt the syscall".) - * The other situation to consider is when a signal came in while the - * host syscall was blocking, and the host kernel decided that the syscall - * should not be restarted; in this case QEMU's host signal handler will - * be invoked with the PC pointing just after the syscall instruction, - * with registers indicating an EINTR return; the special code in the - * handler will not kick in, and we will return EINTR to the guest as - * we should. - * - * Notice that we can leave the host kernel to make the decision for - * us about whether to do a restart of the syscall or not; we do not - * need to check SA_RESTART flags in QEMU or distinguish the various - * kinds of restartability. - */ -#ifdef HAVE_SAFE_SYSCALL -/* The core part of this function is implemented in assembly */ -extern long safe_syscall_base(int *pending, long number, ...); - -#define safe_syscall(...) \ - ({ \ - long ret_; \ - int *psp_ = &((TaskState *)thread_cpu->opaque)->signal_pending; \ - ret_ = safe_syscall_base(psp_, __VA_ARGS__); \ - if (is_error(ret_)) { \ - errno = -ret_; \ - ret_ = -1; \ - } \ - ret_; \ - }) - -#else - -/* Fallback for architectures which don't yet provide a safe-syscall assembly - * fragment; note that this is racy! - * This should go away when all host architectures have been updated. - */ -#define safe_syscall syscall - -#endif - -/* syscall.c */ -int host_to_target_waitstatus(int status); - -/* strace.c */ -void print_syscall(void *cpu_env, int num, - abi_long arg1, abi_long arg2, abi_long arg3, - abi_long arg4, abi_long arg5, abi_long arg6); -void print_syscall_ret(void *cpu_env, int num, abi_long ret, - abi_long arg1, abi_long arg2, abi_long arg3, - abi_long arg4, abi_long arg5, abi_long arg6); -/** - * print_taken_signal: - * @target_signum: target signal being taken - * @tinfo: target_siginfo_t which will be passed to the guest for the signal - * - * Print strace output indicating that this signal is being taken by the guest, - * in a format similar to: - * --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} --- - */ -void print_taken_signal(int target_signum, const target_siginfo_t *tinfo); - -/* signal.c */ -void process_pending_signals(CPUArchState *cpu_env); -void signal_init(void); -int queue_signal(CPUArchState *env, int sig, int si_type, - target_siginfo_t *info); -void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info); -void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo); -int target_to_host_signal(int sig); -int host_to_target_signal(int sig); -long do_sigreturn(CPUArchState *env); -long do_rt_sigreturn(CPUArchState *env); -abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, - CPUArchState *env); -int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset); -abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx, - abi_ulong unew_ctx, abi_long ctx_size); -/** - * block_signals: block all signals while handling this guest syscall - * - * Block all signals, and arrange that the signal mask is returned to - * its correct value for the guest before we resume execution of guest code. - * If this function returns non-zero, then the caller should immediately - * return -TARGET_ERESTARTSYS to the main loop, which will take the pending - * signal and restart execution of the syscall. - * If block_signals() returns zero, then the caller can continue with - * emulation of the system call knowing that no signals can be taken - * (and therefore that no race conditions will result). - * This should only be called once, because if it is called a second time - * it will always return non-zero. (Think of it like a mutex that can't - * be recursively locked.) - * Signals will be unblocked again by process_pending_signals(). - * - * Return value: non-zero if there was a pending signal, zero if not. - */ -int block_signals(void); /* Returns non zero if signal pending */ - -#ifdef TARGET_I386 -/* vm86.c */ -void save_v86_state(CPUX86State *env); -void handle_vm86_trap(CPUX86State *env, int trapno); -void handle_vm86_fault(CPUX86State *env); -int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr); -#elif defined(TARGET_SPARC64) -void sparc64_set_context(CPUSPARCState *env); -void sparc64_get_context(CPUSPARCState *env); -#endif - -/* mmap.c */ -int target_mprotect(abi_ulong start, abi_ulong len, int prot); -abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, - int flags, int fd, abi_ulong offset); -int target_munmap(abi_ulong start, abi_ulong len); -abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, - abi_ulong new_size, unsigned long flags, - abi_ulong new_addr); -extern unsigned long last_brk; -extern abi_ulong mmap_next_start; -abi_ulong mmap_find_vma(abi_ulong, abi_ulong, abi_ulong); -void mmap_fork_start(void); -void mmap_fork_end(int child); - -/* main.c */ -extern unsigned long guest_stack_size; /* user access */ @@ -667,80 +346,4 @@ void *lock_user_string(abi_ulong guest_addr); #define unlock_user_struct(host_ptr, guest_addr, copy) \ unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0) -#include <pthread.h> - -static inline int is_error(abi_long ret) -{ - return (abi_ulong)ret >= (abi_ulong)(-4096); -} - -#if TARGET_ABI_BITS == 32 -static inline uint64_t target_offset64(uint32_t word0, uint32_t word1) -{ -#ifdef TARGET_WORDS_BIGENDIAN - return ((uint64_t)word0 << 32) | word1; -#else - return ((uint64_t)word1 << 32) | word0; -#endif -} -#else /* TARGET_ABI_BITS == 32 */ -static inline uint64_t target_offset64(uint64_t word0, uint64_t word1) -{ - return word0; -} -#endif /* TARGET_ABI_BITS != 32 */ - -void print_termios(void *arg); - -/* ARM EABI and MIPS expect 64bit types aligned even on pairs or registers */ -#ifdef TARGET_ARM -static inline int regpairs_aligned(void *cpu_env, int num) -{ - return ((((CPUARMState *)cpu_env)->eabi) == 1) ; -} -#elif defined(TARGET_MIPS) && (TARGET_ABI_BITS == 32) -static inline int regpairs_aligned(void *cpu_env, int num) { return 1; } -#elif defined(TARGET_PPC) && !defined(TARGET_PPC64) -/* - * SysV AVI for PPC32 expects 64bit parameters to be passed on odd/even pairs - * of registers which translates to the same as ARM/MIPS, because we start with - * r3 as arg1 - */ -static inline int regpairs_aligned(void *cpu_env, int num) { return 1; } -#elif defined(TARGET_SH4) -/* SH4 doesn't align register pairs, except for p{read,write}64 */ -static inline int regpairs_aligned(void *cpu_env, int num) -{ - switch (num) { - case TARGET_NR_pread64: - case TARGET_NR_pwrite64: - return 1; - - default: - return 0; - } -} -#elif defined(TARGET_XTENSA) -static inline int regpairs_aligned(void *cpu_env, int num) { return 1; } -#elif defined(TARGET_HEXAGON) -static inline int regpairs_aligned(void *cpu_env, int num) { return 1; } -#else -static inline int regpairs_aligned(void *cpu_env, int num) { return 0; } -#endif - -/** - * preexit_cleanup: housekeeping before the guest exits - * - * env: the CPU state - * code: the exit code - */ -void preexit_cleanup(CPUArchState *env, int code); - -/* Include target-specific struct and function definitions; - * they may need access to the target-independent structures - * above, so include them last. - */ -#include "target_cpu.h" -#include "target_structs.h" - #endif /* QEMU_H */ |