mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-24 20:19:44 +00:00
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
|
|
#define QEMU_H
|
|
|
|
#include <signal.h>
|
|
#include <string.h>
|
|
|
|
#include "cpu.h"
|
|
#include "exec/cpu_ldst.h"
|
|
|
|
#undef DEBUG_REMAP
|
|
#ifdef DEBUG_REMAP
|
|
#include <stdlib.h>
|
|
#endif /* DEBUG_REMAP */
|
|
|
|
#include "exec/user/abitypes.h"
|
|
|
|
#include "exec/user/thunk.h"
|
|
#include "syscall_defs.h"
|
|
#include "syscall.h"
|
|
#include "exec/gdbstub.h"
|
|
#include "qemu/queue.h"
|
|
|
|
#define THREAD __thread
|
|
|
|
/* 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
|
|
*/
|
|
struct image_info {
|
|
abi_ulong load_bias;
|
|
abi_ulong load_addr;
|
|
abi_ulong start_code;
|
|
abi_ulong end_code;
|
|
abi_ulong start_data;
|
|
abi_ulong end_data;
|
|
abi_ulong start_brk;
|
|
abi_ulong brk;
|
|
abi_ulong start_mmap;
|
|
abi_ulong mmap;
|
|
abi_ulong rss;
|
|
abi_ulong start_stack;
|
|
abi_ulong stack_limit;
|
|
abi_ulong entry;
|
|
abi_ulong code_offset;
|
|
abi_ulong data_offset;
|
|
abi_ulong saved_auxv;
|
|
abi_ulong auxv_len;
|
|
abi_ulong arg_start;
|
|
abi_ulong arg_end;
|
|
uint32_t elf_flags;
|
|
int personality;
|
|
#ifdef CONFIG_USE_FDPIC
|
|
abi_ulong loadmap_addr;
|
|
uint16_t nsegs;
|
|
void *loadsegs;
|
|
abi_ulong pt_dynamic_addr;
|
|
struct image_info *other_info;
|
|
#endif
|
|
};
|
|
|
|
#ifdef TARGET_I386
|
|
/* Information about the current linux thread */
|
|
struct vm86_saved_state {
|
|
uint32_t eax; /* return code */
|
|
uint32_t ebx;
|
|
uint32_t ecx;
|
|
uint32_t edx;
|
|
uint32_t esi;
|
|
uint32_t edi;
|
|
uint32_t ebp;
|
|
uint32_t esp;
|
|
uint32_t eflags;
|
|
uint32_t eip;
|
|
uint16_t cs, ss, ds, es, fs, gs;
|
|
};
|
|
#endif
|
|
|
|
#if defined(TARGET_ARM) && defined(TARGET_ABI32)
|
|
/* FPU emulator */
|
|
#include "nwfpe/fpa11.h"
|
|
#endif
|
|
|
|
#define MAX_SIGQUEUE_SIZE 1024
|
|
|
|
struct sigqueue {
|
|
struct sigqueue *next;
|
|
target_siginfo_t info;
|
|
};
|
|
|
|
struct emulated_sigtable {
|
|
int pending; /* true if signal is pending */
|
|
struct sigqueue *first;
|
|
struct sigqueue info; /* in order to always have memory for the
|
|
first signal, we put it here */
|
|
};
|
|
|
|
/* 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
|
|
# ifdef TARGET_ABI32
|
|
/* FPA state */
|
|
FPA11 fpa;
|
|
# endif
|
|
int swi_errno;
|
|
#endif
|
|
#ifdef TARGET_UNICORE32
|
|
int swi_errno;
|
|
#endif
|
|
#if defined(TARGET_I386) && !defined(TARGET_X86_64)
|
|
abi_ulong target_v86;
|
|
struct vm86_saved_state vm86_saved_regs;
|
|
struct target_vm86plus_struct vm86plus;
|
|
uint32_t v86flags;
|
|
uint32_t v86mask;
|
|
#endif
|
|
abi_ulong child_tidptr;
|
|
#ifdef TARGET_M68K
|
|
int sim_syscalls;
|
|
abi_ulong tp_value;
|
|
#endif
|
|
#if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_UNICORE32)
|
|
/* Extra fields for semihosted binaries. */
|
|
uint32_t heap_base;
|
|
uint32_t heap_limit;
|
|
#endif
|
|
uint32_t stack_base;
|
|
int used; /* non zero if used */
|
|
bool sigsegv_blocked; /* SIGSEGV blocked by guest */
|
|
struct image_info *info;
|
|
struct linux_binprm *bprm;
|
|
|
|
struct emulated_sigtable sigtab[TARGET_NSIG];
|
|
struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
|
|
struct sigqueue *first_free; /* first free siginfo queue entry */
|
|
int signal_pending; /* non zero if a signal may be pending */
|
|
} __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. */
|
|
/*
|
|
* MAX_ARG_PAGES defines the number of pages allocated for arguments
|
|
* and envelope for the new program. 32 should suffice, this gives
|
|
* a maximum env+arg of 128kB w/4KB pages!
|
|
*/
|
|
#define MAX_ARG_PAGES 33
|
|
|
|
/* 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));
|
|
void *page[MAX_ARG_PAGES];
|
|
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 */
|
|
};
|
|
|
|
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 *);
|
|
|
|
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);
|
|
void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
|
|
extern THREAD CPUState *thread_cpu;
|
|
void cpu_loop(CPUArchState *env);
|
|
char *target_strerror(int err);
|
|
int get_osversion(void);
|
|
void init_qemu_uname_release(void);
|
|
void fork_start(void);
|
|
void fork_end(int child);
|
|
|
|
/* Creates the initial guest address space in the host memory space using
|
|
* the given host start address hint and size. The guest_start parameter
|
|
* specifies the start address of the guest space. guest_base will be the
|
|
* difference between the host start address computed by this function and
|
|
* guest_start. If fixed is specified, then the mapped address space must
|
|
* start at host_start. The real start address of the mapped memory space is
|
|
* returned or -1 if there was an error.
|
|
*/
|
|
unsigned long init_guest_space(unsigned long host_start,
|
|
unsigned long host_size,
|
|
unsigned long guest_start,
|
|
bool fixed);
|
|
|
|
#include "qemu/log.h"
|
|
|
|
/* syscall.c */
|
|
int host_to_target_waitstatus(int status);
|
|
|
|
/* strace.c */
|
|
void print_syscall(int num,
|
|
abi_long arg1, abi_long arg2, abi_long arg3,
|
|
abi_long arg4, abi_long arg5, abi_long arg6);
|
|
void print_syscall_ret(int num, abi_long arg1);
|
|
extern int do_strace;
|
|
|
|
/* signal.c */
|
|
void process_pending_signals(CPUArchState *cpu_env);
|
|
void signal_init(void);
|
|
int queue_signal(CPUArchState *env, int sig, 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, abi_ulong sp);
|
|
int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
|
|
|
|
#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);
|
|
int target_msync(abi_ulong start, abi_ulong len, int flags);
|
|
extern unsigned long last_brk;
|
|
extern abi_ulong mmap_next_start;
|
|
void mmap_lock(void);
|
|
void mmap_unlock(void);
|
|
abi_ulong mmap_find_vma(abi_ulong, abi_ulong);
|
|
void cpu_list_lock(void);
|
|
void cpu_list_unlock(void);
|
|
void mmap_fork_start(void);
|
|
void mmap_fork_end(int child);
|
|
|
|
/* main.c */
|
|
extern unsigned long guest_stack_size;
|
|
|
|
/* user access */
|
|
|
|
#define VERIFY_READ 0
|
|
#define VERIFY_WRITE 1 /* implies read access */
|
|
|
|
static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
|
|
{
|
|
return page_check_range((target_ulong)addr, size,
|
|
(type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
|
|
}
|
|
|
|
/* NOTE __get_user and __put_user use host pointers and don't check access.
|
|
These are usually used to access struct data members once the struct has
|
|
been locked - usually with lock_user_struct. */
|
|
|
|
/* Tricky points:
|
|
- Use __builtin_choose_expr to avoid type promotion from ?:,
|
|
- Invalid sizes result in a compile time error stemming from
|
|
the fact that abort has no parameters.
|
|
- It's easier to use the endian-specific unaligned load/store
|
|
functions than host-endian unaligned load/store plus tswapN. */
|
|
|
|
#define __put_user_e(x, hptr, e) \
|
|
(__builtin_choose_expr(sizeof(*(hptr)) == 1, stb_p, \
|
|
__builtin_choose_expr(sizeof(*(hptr)) == 2, stw_##e##_p, \
|
|
__builtin_choose_expr(sizeof(*(hptr)) == 4, stl_##e##_p, \
|
|
__builtin_choose_expr(sizeof(*(hptr)) == 8, stq_##e##_p, abort)))) \
|
|
((hptr), (x)), (void)0)
|
|
|
|
#define __get_user_e(x, hptr, e) \
|
|
((x) = (typeof(*hptr))( \
|
|
__builtin_choose_expr(sizeof(*(hptr)) == 1, ldub_p, \
|
|
__builtin_choose_expr(sizeof(*(hptr)) == 2, lduw_##e##_p, \
|
|
__builtin_choose_expr(sizeof(*(hptr)) == 4, ldl_##e##_p, \
|
|
__builtin_choose_expr(sizeof(*(hptr)) == 8, ldq_##e##_p, abort)))) \
|
|
(hptr)), (void)0)
|
|
|
|
#ifdef TARGET_WORDS_BIGENDIAN
|
|
# define __put_user(x, hptr) __put_user_e(x, hptr, be)
|
|
# define __get_user(x, hptr) __get_user_e(x, hptr, be)
|
|
#else
|
|
# define __put_user(x, hptr) __put_user_e(x, hptr, le)
|
|
# define __get_user(x, hptr) __get_user_e(x, hptr, le)
|
|
#endif
|
|
|
|
/* put_user()/get_user() take a guest address and check access */
|
|
/* These are usually used to access an atomic data type, such as an int,
|
|
* that has been passed by address. These internally perform locking
|
|
* and unlocking on the data type.
|
|
*/
|
|
#define put_user(x, gaddr, target_type) \
|
|
({ \
|
|
abi_ulong __gaddr = (gaddr); \
|
|
target_type *__hptr; \
|
|
abi_long __ret = 0; \
|
|
if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
|
|
__put_user((x), __hptr); \
|
|
unlock_user(__hptr, __gaddr, sizeof(target_type)); \
|
|
} else \
|
|
__ret = -TARGET_EFAULT; \
|
|
__ret; \
|
|
})
|
|
|
|
#define get_user(x, gaddr, target_type) \
|
|
({ \
|
|
abi_ulong __gaddr = (gaddr); \
|
|
target_type *__hptr; \
|
|
abi_long __ret = 0; \
|
|
if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
|
|
__get_user((x), __hptr); \
|
|
unlock_user(__hptr, __gaddr, 0); \
|
|
} else { \
|
|
/* avoid warning */ \
|
|
(x) = 0; \
|
|
__ret = -TARGET_EFAULT; \
|
|
} \
|
|
__ret; \
|
|
})
|
|
|
|
#define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
|
|
#define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
|
|
#define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
|
|
#define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
|
|
#define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
|
|
#define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
|
|
#define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
|
|
#define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
|
|
#define put_user_u8(x, gaddr) put_user((x), (gaddr), uint8_t)
|
|
#define put_user_s8(x, gaddr) put_user((x), (gaddr), int8_t)
|
|
|
|
#define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
|
|
#define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
|
|
#define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
|
|
#define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
|
|
#define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
|
|
#define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
|
|
#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 */
|