If a signal is delivered immediately before a blocking system call the handler will only be called after the system call returns, which may be a long time later or never. This is fixed by using a function (safe_syscall) that checks if a guest signal is pending prior to making a system call, and if so does not call the system call and returns -TARGET_ERESTARTSYS. If a signal is received between the check and the system call host_signal_handler() rewinds execution to before the check. This rewinding has the effect of closing the race window so that safe_syscall will reliably either (a) go into the host syscall with no unprocessed guest signals pending or or (b) return -TARGET_ERESTARTSYS so that the caller can deal with the signals. Implementing this requires a per-host-architecture assembly language fragment. This will also resolve the mishandling of the SA_RESTART flag where we would restart a host system call and not call the guest signal handler until the syscall finally completed -- syscall restarting now always happens at the guest syscall level so the guest signal handler will run. (The host syscall will never be restarted because if the host kernel rewinds the PC to point at the syscall insn for a restart then our host_signal_handler() will see this and arrange the guest PC rewind.) This commit contains the infrastructure for implementing safe_syscall and the assembly language fragment for x86-64, but does not change any syscalls to use it. Signed-off-by: Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk> Message-id: 1441497448-32489-14-git-send-email-T.E.Baldwin99@members.leeds.ac.uk [PMM: * Avoid having an architecture if-ladder in configure by putting linux-user/host/$(ARCH) on the include path and including safe-syscall.inc.S from it * Avoid ifdef ladder in signal.c by creating new hostdep.h to hold host-architecture-specific things * Added copyright/license header to safe-syscall.inc.S * Rewrote commit message * Added comments to safe-syscall.inc.S * Changed calling convention of safe_syscall() to match syscall() (returns -1 and host error in errno on failure) * Added a long comment in qemu.h about how to use safe_syscall() to implement guest syscalls. ] RV: squashed Peters "fixup! linux-user: compile on non-x86-64 hosts" patch Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
571 lines
21 KiB
C
571 lines
21 KiB
C
#ifndef QEMU_H
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#define QEMU_H
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#include "hostdep.h"
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#include "cpu.h"
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#include "exec/exec-all.h"
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#include "exec/cpu_ldst.h"
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#undef DEBUG_REMAP
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#ifdef DEBUG_REMAP
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#endif /* DEBUG_REMAP */
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#include "exec/user/abitypes.h"
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#include "exec/user/thunk.h"
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#include "syscall_defs.h"
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#include "target_syscall.h"
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#include "exec/gdbstub.h"
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#include "qemu/queue.h"
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#define THREAD __thread
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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 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 arg_start;
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abi_ulong arg_end;
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uint32_t elf_flags;
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int personality;
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#ifdef CONFIG_USE_FDPIC
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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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struct image_info *other_info;
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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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#define MAX_SIGQUEUE_SIZE 1024
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struct sigqueue {
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struct sigqueue *next;
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target_siginfo_t info;
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};
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struct emulated_sigtable {
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int pending; /* true if signal is pending */
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struct sigqueue *first;
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struct sigqueue info; /* in order to always have memory for the
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first signal, we put it here */
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};
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/* NOTE: we force a big alignment so that the stack stored after is
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aligned too */
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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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int swi_errno;
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#endif
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#ifdef TARGET_UNICORE32
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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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int sim_syscalls;
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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_UNICORE32)
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/* Extra fields for semihosted binaries. */
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uint32_t heap_base;
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uint32_t heap_limit;
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#endif
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uint32_t stack_base;
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int used; /* non zero if used */
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bool sigsegv_blocked; /* SIGSEGV blocked by guest */
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struct image_info *info;
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struct linux_binprm *bprm;
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struct emulated_sigtable sigtab[TARGET_NSIG];
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struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
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struct sigqueue *first_free; /* first free siginfo queue entry */
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int signal_pending; /* non zero if a signal may be pending */
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} __attribute__((aligned(16))) TaskState;
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extern char *exec_path;
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void init_task_state(TaskState *ts);
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void task_settid(TaskState *);
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void stop_all_tasks(void);
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extern const char *qemu_uname_release;
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extern unsigned long mmap_min_addr;
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/* ??? See if we can avoid exposing so much of the loader internals. */
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/* Read a good amount of data initially, to hopefully get all the
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program headers loaded. */
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#define BPRM_BUF_SIZE 1024
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/*
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* This structure is used to hold the arguments that are
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* used when loading binaries.
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*/
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struct linux_binprm {
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char buf[BPRM_BUF_SIZE] __attribute__((aligned));
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abi_ulong p;
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int fd;
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int e_uid, e_gid;
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int argc, envc;
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char **argv;
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char **envp;
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char * filename; /* Name of binary */
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int (*core_dump)(int, const CPUArchState *); /* coredump routine */
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};
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void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
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abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
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abi_ulong stringp, int push_ptr);
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int loader_exec(int fdexec, const char *filename, char **argv, char **envp,
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struct target_pt_regs * regs, struct image_info *infop,
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struct linux_binprm *);
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int load_elf_binary(struct linux_binprm *bprm, struct image_info *info);
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int load_flt_binary(struct linux_binprm *bprm, struct image_info *info);
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abi_long memcpy_to_target(abi_ulong dest, const void *src,
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unsigned long len);
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void target_set_brk(abi_ulong new_brk);
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abi_long do_brk(abi_ulong new_brk);
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void syscall_init(void);
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abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
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abi_long arg2, abi_long arg3, abi_long arg4,
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abi_long arg5, abi_long arg6, abi_long arg7,
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abi_long arg8);
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void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
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extern THREAD CPUState *thread_cpu;
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void cpu_loop(CPUArchState *env);
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char *target_strerror(int err);
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int get_osversion(void);
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void init_qemu_uname_release(void);
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void fork_start(void);
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void fork_end(int child);
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/* Creates the initial guest address space in the host memory space using
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* the given host start address hint and size. The guest_start parameter
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* specifies the start address of the guest space. guest_base will be the
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* difference between the host start address computed by this function and
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* guest_start. If fixed is specified, then the mapped address space must
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* start at host_start. The real start address of the mapped memory space is
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* returned or -1 if there was an error.
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*/
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unsigned long init_guest_space(unsigned long host_start,
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unsigned long host_size,
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unsigned long guest_start,
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bool fixed);
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#include "qemu/log.h"
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/* safe_syscall.S */
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/**
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* safe_syscall:
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* @int number: number of system call to make
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* ...: arguments to the system call
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*
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* Call a system call if guest signal not pending.
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* This has the same API as the libc syscall() function, except that it
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* may return -1 with errno == TARGET_ERESTARTSYS if a signal was pending.
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*
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* Returns: the system call result, or -1 with an error code in errno
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* (Errnos are host errnos; we rely on TARGET_ERESTARTSYS not clashing
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* with any of the host errno values.)
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*/
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/* A guide to using safe_syscall() to handle interactions between guest
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* syscalls and guest signals:
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*
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* Guest syscalls come in two flavours:
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*
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* (1) Non-interruptible syscalls
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*
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* These are guest syscalls that never get interrupted by signals and
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* so never return EINTR. They can be implemented straightforwardly in
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* QEMU: just make sure that if the implementation code has to make any
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* blocking calls that those calls are retried if they return EINTR.
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* It's also OK to implement these with safe_syscall, though it will be
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* a little less efficient if a signal is delivered at the 'wrong' moment.
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*
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* (2) Interruptible syscalls
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*
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* These are guest syscalls that can be interrupted by signals and
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* for which we need to either return EINTR or arrange for the guest
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* syscall to be restarted. This category includes both syscalls which
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* always restart (and in the kernel return -ERESTARTNOINTR), ones
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* which only restart if there is no handler (kernel returns -ERESTARTNOHAND
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* or -ERESTART_RESTARTBLOCK), and the most common kind which restart
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* if the handler was registered with SA_RESTART (kernel returns
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* -ERESTARTSYS). System calls which are only interruptible in some
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* situations (like 'open') also need to be handled this way.
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*
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* Here it is important that the host syscall is made
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* via this safe_syscall() function, and *not* via the host libc.
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* If the host libc is used then the implementation will appear to work
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* most of the time, but there will be a race condition where a
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* signal could arrive just before we make the host syscall inside libc,
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* and then then guest syscall will not correctly be interrupted.
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* Instead the implementation of the guest syscall can use the safe_syscall
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* function but otherwise just return the result or errno in the usual
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* way; the main loop code will take care of restarting the syscall
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* if appropriate.
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*
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* (If the implementation needs to make multiple host syscalls this is
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* OK; any which might really block must be via safe_syscall(); for those
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* which are only technically blocking (ie which we know in practice won't
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* stay in the host kernel indefinitely) it's OK to use libc if necessary.
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* You must be able to cope with backing out correctly if some safe_syscall
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* you make in the implementation returns either -TARGET_ERESTARTSYS or
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* EINTR though.)
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*
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*
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* How and why the safe_syscall implementation works:
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*
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* The basic setup is that we make the host syscall via a known
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* section of host native assembly. If a signal occurs, our signal
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* handler checks the interrupted host PC against the addresse of that
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* known section. If the PC is before or at the address of the syscall
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* instruction then we change the PC to point at a "return
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* -TARGET_ERESTARTSYS" code path instead, and then exit the signal handler
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* (causing the safe_syscall() call to immediately return that value).
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* Then in the main.c loop if we see this magic return value we adjust
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* the guest PC to wind it back to before the system call, and invoke
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* the guest signal handler as usual.
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*
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* This winding-back will happen in two cases:
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* (1) signal came in just before we took the host syscall (a race);
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* in this case we'll take the guest signal and have another go
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* at the syscall afterwards, and this is indistinguishable for the
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* guest from the timing having been different such that the guest
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* signal really did win the race
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* (2) signal came in while the host syscall was blocking, and the
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* host kernel decided the syscall should be restarted;
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* in this case we want to restart the guest syscall also, and so
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* rewinding is the right thing. (Note that "restart" semantics mean
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* "first call the signal handler, then reattempt the syscall".)
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* The other situation to consider is when a signal came in while the
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* host syscall was blocking, and the host kernel decided that the syscall
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* should not be restarted; in this case QEMU's host signal handler will
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* be invoked with the PC pointing just after the syscall instruction,
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* with registers indicating an EINTR return; the special code in the
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* handler will not kick in, and we will return EINTR to the guest as
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* we should.
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*
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* Notice that we can leave the host kernel to make the decision for
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* us about whether to do a restart of the syscall or not; we do not
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* need to check SA_RESTART flags in QEMU or distinguish the various
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* kinds of restartability.
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*/
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#ifdef HAVE_SAFE_SYSCALL
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/* The core part of this function is implemented in assembly */
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extern long safe_syscall_base(int *pending, long number, ...);
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#define safe_syscall(...) \
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({ \
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long ret_; \
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int *psp_ = &((TaskState *)thread_cpu->opaque)->signal_pending; \
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ret_ = safe_syscall_base(psp_, __VA_ARGS__); \
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if (is_error(ret_)) { \
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errno = -ret_; \
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ret_ = -1; \
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} \
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ret_; \
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})
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#else
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/* Fallback for architectures which don't yet provide a safe-syscall assembly
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* fragment; note that this is racy!
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* This should go away when all host architectures have been updated.
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*/
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#define safe_syscall syscall
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#endif
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/* syscall.c */
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int host_to_target_waitstatus(int status);
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/* strace.c */
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void print_syscall(int num,
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abi_long arg1, abi_long arg2, abi_long arg3,
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abi_long arg4, abi_long arg5, abi_long arg6);
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void print_syscall_ret(int num, abi_long arg1);
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extern int do_strace;
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/* signal.c */
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void process_pending_signals(CPUArchState *cpu_env);
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void signal_init(void);
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int queue_signal(CPUArchState *env, int sig, target_siginfo_t *info);
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void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
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void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
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int target_to_host_signal(int sig);
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int host_to_target_signal(int sig);
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long do_sigreturn(CPUArchState *env);
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long do_rt_sigreturn(CPUArchState *env);
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abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
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int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
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#ifdef TARGET_I386
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/* vm86.c */
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void save_v86_state(CPUX86State *env);
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void handle_vm86_trap(CPUX86State *env, int trapno);
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void handle_vm86_fault(CPUX86State *env);
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int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr);
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#elif defined(TARGET_SPARC64)
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void sparc64_set_context(CPUSPARCState *env);
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void sparc64_get_context(CPUSPARCState *env);
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#endif
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/* mmap.c */
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int target_mprotect(abi_ulong start, abi_ulong len, int prot);
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abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
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int flags, int fd, abi_ulong offset);
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int target_munmap(abi_ulong start, abi_ulong len);
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abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
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abi_ulong new_size, unsigned long flags,
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abi_ulong new_addr);
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int target_msync(abi_ulong start, abi_ulong len, int flags);
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extern unsigned long last_brk;
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extern abi_ulong mmap_next_start;
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abi_ulong mmap_find_vma(abi_ulong, abi_ulong);
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void cpu_list_lock(void);
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void cpu_list_unlock(void);
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void mmap_fork_start(void);
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void mmap_fork_end(int child);
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/* main.c */
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extern unsigned long guest_stack_size;
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/* user access */
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1 /* implies read access */
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static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
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{
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return page_check_range((target_ulong)addr, size,
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(type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
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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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/* 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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#define __put_user_e(x, hptr, e) \
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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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#define __get_user_e(x, hptr, e) \
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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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#ifdef TARGET_WORDS_BIGENDIAN
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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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|
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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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|
|
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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)
|
|
#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)
|
|
#define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
|
|
#define get_user_u8(x, gaddr) get_user((x), (gaddr), uint8_t)
|
|
#define get_user_s8(x, gaddr) get_user((x), (gaddr), int8_t)
|
|
|
|
/* copy_from_user() and copy_to_user() are usually used to copy data
|
|
* buffers between the target and host. These internally perform
|
|
* locking/unlocking of the memory.
|
|
*/
|
|
abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
|
|
abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
|
|
|
|
/* Functions for accessing guest memory. The tget and tput functions
|
|
read/write single values, byteswapping as necessary. The lock_user function
|
|
gets a pointer to a contiguous area of guest memory, but does not perform
|
|
any byteswapping. lock_user may return either a pointer to the guest
|
|
memory, or a temporary buffer. */
|
|
|
|
/* Lock an area of guest memory into the host. If copy is true then the
|
|
host area will have the same contents as the guest. */
|
|
static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
|
|
{
|
|
if (!access_ok(type, guest_addr, len))
|
|
return NULL;
|
|
#ifdef DEBUG_REMAP
|
|
{
|
|
void *addr;
|
|
addr = malloc(len);
|
|
if (copy)
|
|
memcpy(addr, g2h(guest_addr), len);
|
|
else
|
|
memset(addr, 0, len);
|
|
return addr;
|
|
}
|
|
#else
|
|
return g2h(guest_addr);
|
|
#endif
|
|
}
|
|
|
|
/* Unlock an area of guest memory. The first LEN bytes must be
|
|
flushed back to guest memory. host_ptr = NULL is explicitly
|
|
allowed and does nothing. */
|
|
static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
|
|
long len)
|
|
{
|
|
|
|
#ifdef DEBUG_REMAP
|
|
if (!host_ptr)
|
|
return;
|
|
if (host_ptr == g2h(guest_addr))
|
|
return;
|
|
if (len > 0)
|
|
memcpy(g2h(guest_addr), host_ptr, len);
|
|
free(host_ptr);
|
|
#endif
|
|
}
|
|
|
|
/* Return the length of a string in target memory or -TARGET_EFAULT if
|
|
access error. */
|
|
abi_long target_strlen(abi_ulong gaddr);
|
|
|
|
/* Like lock_user but for null terminated strings. */
|
|
static inline void *lock_user_string(abi_ulong guest_addr)
|
|
{
|
|
abi_long len;
|
|
len = target_strlen(guest_addr);
|
|
if (len < 0)
|
|
return NULL;
|
|
return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
|
|
}
|
|
|
|
/* Helper macros for locking/unlocking a target struct. */
|
|
#define lock_user_struct(type, host_ptr, guest_addr, copy) \
|
|
(host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
|
|
#define unlock_user_struct(host_ptr, guest_addr, copy) \
|
|
unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
|
|
|
|
#include <pthread.h>
|
|
|
|
/* 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_signal.h"
|
|
#include "target_structs.h"
|
|
|
|
#endif /* QEMU_H */
|