linux-user/qemu.h

   1 #ifndef QEMU_H
   2 #define QEMU_H
   3
   4 #include <signal.h>
   5 #include <string.h>
   6
   7 #include "cpu.h"
   8
   9 #ifdef TARGET_ABI32
  10 typedef uint32_t abi_ulong;
  11 typedef int32_t abi_long;
  12 #define TARGET_ABI_FMT_lx "%08x"
  13 #define TARGET_ABI_FMT_ld "%d"
  14 #define TARGET_ABI_FMT_lu "%u"
  15 #define TARGET_ABI_BITS 32
  16 #else
  17 typedef target_ulong abi_ulong;
  18 typedef target_long abi_long;
  19 #define TARGET_ABI_FMT_lx TARGET_FMT_lx
  20 #define TARGET_ABI_FMT_ld TARGET_FMT_ld
  21 #define TARGET_ABI_FMT_lu TARGET_FMT_lu
  22 #define TARGET_ABI_BITS TARGET_LONG_BITS
  23 /* for consistency, define ABI32 too */
  24 #if TARGET_ABI_BITS == 32
  25 #define TARGET_ABI32 1
  26 #endif
  27 #endif
  28
  29 #include "thunk.h"
  30 #include "syscall_defs.h"
  31 #include "syscall.h"
  32 #include "target_signal.h"
  33 #include "gdbstub.h"
  34
  35 /* This struct is used to hold certain information about the image.
  36  * Basically, it replicates in user space what would be certain
  37  * task_struct fields in the kernel
  38  */
  39 struct image_info {
  40         abi_ulong       load_addr;
  41         abi_ulong       start_code;
  42         abi_ulong       end_code;
  43         abi_ulong       start_data;
  44         abi_ulong       end_data;
  45         abi_ulong       start_brk;
  46         abi_ulong       brk;
  47         abi_ulong       start_mmap;
  48         abi_ulong       mmap;
  49         abi_ulong       rss;
  50         abi_ulong       start_stack;
  51         abi_ulong       entry;
  52         abi_ulong       code_offset;
  53         abi_ulong       data_offset;
  54         char            **host_argv;
  55         int             personality;
  56 };
  57
  58 #ifdef TARGET_I386
  59 /* Information about the current linux thread */
  60 struct vm86_saved_state {
  61     uint32_t eax; /* return code */
  62     uint32_t ebx;
  63     uint32_t ecx;
  64     uint32_t edx;
  65     uint32_t esi;
  66     uint32_t edi;
  67     uint32_t ebp;
  68     uint32_t esp;
  69     uint32_t eflags;
  70     uint32_t eip;
  71     uint16_t cs, ss, ds, es, fs, gs;
  72 };
  73 #endif
  74
  75 #ifdef TARGET_ARM
  76 /* FPU emulator */
  77 #include "nwfpe/fpa11.h"
  78 #endif
  79
  80 /* NOTE: we force a big alignment so that the stack stored after is
  81    aligned too */
  82 typedef struct TaskState {
  83     struct TaskState *next;
  84 #ifdef TARGET_ARM
  85     /* FPA state */
  86     FPA11 fpa;
  87     int swi_errno;
  88 #endif
  89 #if defined(TARGET_I386) && !defined(TARGET_X86_64)
  90     abi_ulong target_v86;
  91     struct vm86_saved_state vm86_saved_regs;
  92     struct target_vm86plus_struct vm86plus;
  93     uint32_t v86flags;
  94     uint32_t v86mask;
  95 #endif
  96 #ifdef TARGET_M68K
  97     int sim_syscalls;
  98 #endif
  99 #if defined(TARGET_ARM) || defined(TARGET_M68K)
 100     /* Extra fields for semihosted binaries.  */
 101     uint32_t stack_base;
 102     uint32_t heap_base;
 103     uint32_t heap_limit;
 104 #endif
 105     int used; /* non zero if used */
 106     struct image_info *info;
 107     uint8_t stack[0];
 108 } __attribute__((aligned(16))) TaskState;
 109
 110 extern TaskState *first_task_state;
 111 extern const char *qemu_uname_release;
 112
 113 /* ??? See if we can avoid exposing so much of the loader internals.  */
 114 /*
 115  * MAX_ARG_PAGES defines the number of pages allocated for arguments
 116  * and envelope for the new program. 32 should suffice, this gives
 117  * a maximum env+arg of 128kB w/4KB pages!
 118  */
 119 #define MAX_ARG_PAGES 32
 120
 121 /*
 122  * This structure is used to hold the arguments that are
 123  * used when loading binaries.
 124  */
 125 struct linux_binprm {
 126         char buf[128];
 127         void *page[MAX_ARG_PAGES];
 128         abi_ulong p;
 129         int fd;
 130         int e_uid, e_gid;
 131         int argc, envc;
 132         char **argv;
 133         char **envp;
 134         char * filename;        /* Name of binary */
 135 };
 136
 137 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
 138 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
 139                               abi_ulong stringp, int push_ptr);
 140 int loader_exec(const char * filename, char ** argv, char ** envp,
 141              struct target_pt_regs * regs, struct image_info *infop);
 142
 143 int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
 144                     struct image_info * info);
 145 int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
 146                     struct image_info * info);
 147 #ifdef TARGET_HAS_ELFLOAD32
 148 int load_elf_binary_multi(struct linux_binprm *bprm,
 149                           struct target_pt_regs *regs,
 150                           struct image_info *info);
 151 #endif
 152
 153 abi_long memcpy_to_target(abi_ulong dest, const void *src,
 154                           unsigned long len);
 155 void target_set_brk(abi_ulong new_brk);
 156 abi_long do_brk(abi_ulong new_brk);
 157 void syscall_init(void);
 158 abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 159                     abi_long arg2, abi_long arg3, abi_long arg4,
 160                     abi_long arg5, abi_long arg6);
 161 void gemu_log(const char *fmt, ...) __attribute__((format(printf,1,2)));
 162 extern CPUState *global_env;
 163 void cpu_loop(CPUState *env);
 164 void init_paths(const char *prefix);
 165 const char *path(const char *pathname);
 166 char *target_strerror(int err);
 167
 168 extern int loglevel;
 169 extern FILE *logfile;
 170
 171 /* strace.c */
 172 void print_syscall(int num,
 173                    abi_long arg1, abi_long arg2, abi_long arg3,
 174                    abi_long arg4, abi_long arg5, abi_long arg6);
 175 void print_syscall_ret(int num, abi_long arg1);
 176 extern int do_strace;
 177
 178 /* signal.c */
 179 void process_pending_signals(void *cpu_env);
 180 void signal_init(void);
 181 int queue_signal(int sig, target_siginfo_t *info);
 182 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
 183 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
 184 long do_sigreturn(CPUState *env);
 185 long do_rt_sigreturn(CPUState *env);
 186 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
 187
 188 #ifdef TARGET_I386
 189 /* vm86.c */
 190 void save_v86_state(CPUX86State *env);
 191 void handle_vm86_trap(CPUX86State *env, int trapno);
 192 void handle_vm86_fault(CPUX86State *env);
 193 int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr);
 194 #elif defined(TARGET_SPARC64)
 195 void sparc64_set_context(CPUSPARCState *env);
 196 void sparc64_get_context(CPUSPARCState *env);
 197 #endif
 198
 199 /* mmap.c */
 200 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
 201 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
 202                      int flags, int fd, abi_ulong offset);
 203 int target_munmap(abi_ulong start, abi_ulong len);
 204 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
 205                        abi_ulong new_size, unsigned long flags,
 206                        abi_ulong new_addr);
 207 int target_msync(abi_ulong start, abi_ulong len, int flags);
 208
 209 /* user access */
 210
 211 #define VERIFY_READ 0
 212 #define VERIFY_WRITE 1 /* implies read access */
 213
 214 static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
 215 {
 216     return page_check_range((target_ulong)addr, size,
 217                             (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
 218 }
 219
 220 /* NOTE __get_user and __put_user use host pointers and don't check access. */
 221 /* These are usually used to access struct data members once the
 222  * struct has been locked - usually with lock_user_struct().
 223  */
 224 #define __put_user(x, hptr)\
 225 ({\
 226     int size = sizeof(*hptr);\
 227     switch(size) {\
 228     case 1:\
 229         *(uint8_t *)(hptr) = (uint8_t)(typeof(*hptr))(x);\
 230         break;\
 231     case 2:\
 232         *(uint16_t *)(hptr) = tswap16((typeof(*hptr))(x));\
 233         break;\
 234     case 4:\
 235         *(uint32_t *)(hptr) = tswap32((typeof(*hptr))(x));\
 236         break;\
 237     case 8:\
 238         *(uint64_t *)(hptr) = tswap64((typeof(*hptr))(x));\
 239         break;\
 240     default:\
 241         abort();\
 242     }\
 243     0;\
 244 })
 245
 246 #define __get_user(x, hptr) \
 247 ({\
 248     int size = sizeof(*hptr);\
 249     switch(size) {\
 250     case 1:\
 251         x = (typeof(*hptr))*(uint8_t *)(hptr);\
 252         break;\
 253     case 2:\
 254         x = (typeof(*hptr))tswap16(*(uint16_t *)(hptr));\
 255         break;\
 256     case 4:\
 257         x = (typeof(*hptr))tswap32(*(uint32_t *)(hptr));\
 258         break;\
 259     case 8:\
 260         x = (typeof(*hptr))tswap64(*(uint64_t *)(hptr));\
 261         break;\
 262     default:\
 263         /* avoid warning */\
 264         x = 0;\
 265         abort();\
 266     }\
 267     0;\
 268 })
 269
 270 /* put_user()/get_user() take a guest address and check access */
 271 /* These are usually used to access an atomic data type, such as an int,
 272  * that has been passed by address.  These internally perform locking
 273  * and unlocking on the data type.
 274  */
 275 #define put_user(x, gaddr, target_type)                                 \
 276 ({                                                                      \
 277     abi_ulong __gaddr = (gaddr);                                        \
 278     target_type *__hptr;                                                \
 279     abi_long __ret;                                                     \
 280     if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
 281         __ret = __put_user((x), __hptr);                                \
 282         unlock_user(__hptr, __gaddr, sizeof(target_type));              \
 283     } else                                                              \
 284         __ret = -TARGET_EFAULT;                                         \
 285     __ret;                                                              \
 286 })
 287
 288 #define get_user(x, gaddr, target_type)                                 \
 289 ({                                                                      \
 290     abi_ulong __gaddr = (gaddr);                                        \
 291     target_type *__hptr;                                                \
 292     abi_long __ret;                                                     \
 293     if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
 294         __ret = __get_user((x), __hptr);                                \
 295         unlock_user(__hptr, __gaddr, 0);                                \
 296     } else {                                                            \
 297         /* avoid warning */                                             \
 298         (x) = 0;                                                        \
 299         __ret = -TARGET_EFAULT;                                         \
 300     }                                                                   \
 301     __ret;                                                              \
 302 })
 303
 304 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
 305 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
 306 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
 307 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
 308 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
 309 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
 310 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
 311 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
 312 #define put_user_u8(x, gaddr)  put_user((x), (gaddr), uint8_t)
 313 #define put_user_s8(x, gaddr)  put_user((x), (gaddr), int8_t)
 314
 315 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
 316 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
 317 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
 318 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
 319 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
 320 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
 321 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
 322 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
 323 #define get_user_u8(x, gaddr)  get_user((x), (gaddr), uint8_t)
 324 #define get_user_s8(x, gaddr)  get_user((x), (gaddr), int8_t)
 325
 326 /* copy_from_user() and copy_to_user() are usually used to copy data
 327  * buffers between the target and host.  These internally perform
 328  * locking/unlocking of the memory.
 329  */
 330 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
 331 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 332
 333 /* Functions for accessing guest memory.  The tget and tput functions
 334    read/write single values, byteswapping as neccessary.  The lock_user
 335    gets a pointer to a contiguous area of guest memory, but does not perform
 336    and byteswapping.  lock_user may return either a pointer to the guest
 337    memory, or a temporary buffer.  */
 338
 339 /* Lock an area of guest memory into the host.  If copy is true then the
 340    host area will have the same contents as the guest.  */
 341 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
 342 {
 343     if (!access_ok(type, guest_addr, len))
 344         return NULL;
 345 #ifdef DEBUG_REMAP
 346     {
 347         void *addr;
 348         addr = malloc(len);
 349         if (copy)
 350             memcpy(addr, g2h(guest_addr), len);
 351         else
 352             memset(addr, 0, len);
 353         return addr;
 354     }
 355 #else
 356     return g2h(guest_addr);
 357 #endif
 358 }
 359
 360 /* Unlock an area of guest memory.  The first LEN bytes must be
 361    flushed back to guest memory. host_ptr = NULL is explicitely
 362    allowed and does nothing. */
 363 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
 364                                long len)
 365 {
 366
 367 #ifdef DEBUG_REMAP
 368     if (!host_ptr)
 369         return;
 370     if (host_ptr == g2h(guest_addr))
 371         return;
 372     if (len > 0)
 373         memcpy(g2h(guest_ptr), host_ptr, len);
 374     free(host_ptr);
 375 #endif
 376 }
 377
 378 /* Return the length of a string in target memory or -TARGET_EFAULT if
 379    access error. */
 380 abi_long target_strlen(abi_ulong gaddr);
 381
 382 /* Like lock_user but for null terminated strings.  */
 383 static inline void *lock_user_string(abi_ulong guest_addr)
 384 {
 385     abi_long len;
 386     len = target_strlen(guest_addr);
 387     if (len < 0)
 388         return NULL;
 389     return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
 390 }
 391
 392 /* Helper macros for locking/ulocking a target struct.  */
 393 #define lock_user_struct(type, host_ptr, guest_addr, copy)      \
 394     (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
 395 #define unlock_user_struct(host_ptr, guest_addr, copy)          \
 396     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
 397
 398 #endif /* QEMU_H */