a42267ef58
gcc-4.9 finds unused operand:
linux-user/syscall.c: In function ‘host_to_target_stat64’:
linux-user/qemu.h:301:19: error: right-hand operand of comma expression
has no effect [-Werror=unused-value]
((hptr), (x)), 0)
Just removing the rh operand is no good, it will error in later:
linux-user/main.c: In function ‘arm_kernel_cmpxchg64_helper’:
linux-user/qemu.h:330:15: error: void value not ignored as it ought to be
__ret = __put_user((x), __hptr); \
Thus, remove setting __ret from __get_user and __put_user, as and
set the right hand operand to (void)0 to make it clear that these
return never nothing.
This commit depends on the signal.c cleanup, to ensure bisectable
version history.
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Cc: Richard Henderson <rth@twiddle.net>
459 lines
16 KiB
C
459 lines
16 KiB
C
#ifndef QEMU_H
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#define QEMU_H
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#include <signal.h>
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#include <string.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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#ifdef DEBUG_REMAP
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#include <stdlib.h>
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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 "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 mmap;
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abi_ulong rss;
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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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/*
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* MAX_ARG_PAGES defines the number of pages allocated for arguments
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* and envelope for the new program. 32 should suffice, this gives
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* a maximum env+arg of 128kB w/4KB pages!
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*/
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#define MAX_ARG_PAGES 33
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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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void *page[MAX_ARG_PAGES];
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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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/* 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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void mmap_lock(void);
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void mmap_unlock(void);
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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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#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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abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
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abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_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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static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
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{
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if (!access_ok(type, guest_addr, len))
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return NULL;
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#ifdef DEBUG_REMAP
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{
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void *addr;
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addr = malloc(len);
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if (copy)
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memcpy(addr, g2h(guest_addr), len);
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else
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memset(addr, 0, len);
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return addr;
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}
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#else
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return g2h(guest_addr);
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#endif
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}
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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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static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
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long len)
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{
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#ifdef DEBUG_REMAP
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if (!host_ptr)
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return;
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if (host_ptr == g2h(guest_addr))
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return;
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if (len > 0)
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memcpy(g2h(guest_addr), host_ptr, len);
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free(host_ptr);
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#endif
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}
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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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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 */
|