1 /*

     2  * Helper routines to provide target memory access for semihosting

     3  * syscalls in system emulation mode.

     4  *

     5  * Copyright (c) 2007 CodeSourcery.

     6  *

     7  * This code is licenced under the GPL

     8  */

     9 

    10 static inline uint32_t softmmu_tget32(CPUState *env, uint32_t addr)

    11 {

    12     uint32_t val;

    13 

    14     cpu_memory_rw_debug(env, addr, (uint8_t *)&val, 4, 0);

    15     return tswap32(val);

    16 }

    17 static inline uint32_t softmmu_tget8(CPUState *env, uint32_t addr)

    18 {

    19     uint8_t val;

    20 

    21     cpu_memory_rw_debug(env, addr, &val, 1, 0);

    22     return val;

    23 }

    24 

    25 #define get_user_u32(arg, p) ({ arg = softmmu_tget32(env, p) ; 0; })

    26 #define get_user_u8(arg, p) ({ arg = softmmu_tget8(env, p) ; 0; })

    27 #define get_user_ual(arg, p) get_user_u32(arg, p)

    28 

    29 static inline void softmmu_tput32(CPUState *env, uint32_t addr, uint32_t val)

    30 {

    31     val = tswap32(val);

    32     cpu_memory_rw_debug(env, addr, (uint8_t *)&val, 4, 1);

    33 }

    34 #define put_user_u32(arg, p) ({ softmmu_tput32(env, p, arg) ; 0; })

    35 #define put_user_ual(arg, p) put_user_u32(arg, p)

    36 

    37 static void *softmmu_lock_user(CPUState *env, uint32_t addr, uint32_t len,

    38                                int copy)

    39 {

    40     uint8_t *p;

    41     /* TODO: Make this something that isn't fixed size.  */

    42     p = malloc(len);

    43     if (copy)

    44         cpu_memory_rw_debug(env, addr, p, len, 0);

    45     return p;

    46 }

    47 #define lock_user(type, p, len, copy) softmmu_lock_user(env, p, len, copy)

    48 static char *softmmu_lock_user_string(CPUState *env, uint32_t addr)

    49 {

    50     char *p;

    51     char *s;

    52     uint8_t c;

    53     /* TODO: Make this something that isn't fixed size.  */

    54     s = p = malloc(1024);

    55     do {

    56         cpu_memory_rw_debug(env, addr, &c, 1, 0);

    57         addr++;

    58         *(p++) = c;

    59     } while (c);

    60     return s;

    61 }

    62 #define lock_user_string(p) softmmu_lock_user_string(env, p)

    63 static int softmmu_target_strlen(CPUState *env, target_ulong addr)

    64 {

    65     uint8_t c;

    66     int len;

    67 

    68     len = 0;

    69     do {

    70         cpu_memory_rw_debug(env, addr + len, &c, 1, 0);

    71         len++;

    72     } while (c);

    73 

    74     return len - 1;

    75 }

    76 #define target_strlen(p) softmmu_target_strlen(env, p)

    77 

    78 static void softmmu_unlock_user(CPUState *env, void *p, target_ulong addr,

    79                                 target_ulong len)

    80 {

    81     if (len)

    82         cpu_memory_rw_debug(env, addr, p, len, 1);

    83     free(p);

    84 }

    85 #define unlock_user(s, args, len) softmmu_unlock_user(env, s, args, len)