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      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 void softmmu_unlock_user(CPUState *env, void *p, target_ulong addr,
     64                                 target_ulong len)
     65 {
     66     if (len)
     67         cpu_memory_rw_debug(env, addr, p, len, 1);
     68     free(p);
     69 }
     70 #define unlock_user(s, args, len) softmmu_unlock_user(env, s, args, len)
     71