void do_m68k_semihosting(CPUM68KState *env, int nr) { uint32_t args; void *p; void *q; uint32_t len; uint32_t result; args = env->dregs[1]; switch (nr) { case HOSTED_EXIT: gdb_exit(env, env->dregs[0]); exit(env->dregs[0]); case HOSTED_OPEN: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", ARG(0), (int)ARG(1), ARG(2), ARG(3)); return; } else { if (!(p = lock_user_string(ARG(0)))) { /* FIXME - check error code? */ result = -1; } else { result = open(p, translate_openflags(ARG(2)), ARG(3)); unlock_user(p, ARG(0), 0); } } break; case HOSTED_CLOSE: { /* Ignore attempts to close stdin/out/err. */ int fd = ARG(0); if (fd > 2) { if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "close,%x", ARG(0)); return; } else { result = close(fd); } } else { result = 0; } break; } case HOSTED_READ: len = ARG(2); if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x", ARG(0), ARG(1), len); return; } else { if (!(p = lock_user(VERIFY_WRITE, ARG(1), len, 0))) { /* FIXME - check error code? */ result = -1; } else { result = read(ARG(0), p, len); unlock_user(p, ARG(1), len); } } break; case HOSTED_WRITE: len = ARG(2); if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x", ARG(0), ARG(1), len); return; } else { if (!(p = lock_user(VERIFY_READ, ARG(1), len, 1))) { /* FIXME - check error code? */ result = -1; } else { result = write(ARG(0), p, len); unlock_user(p, ARG(0), 0); } } break; case HOSTED_LSEEK: { uint64_t off; off = (uint32_t)ARG(2) | ((uint64_t)ARG(1) << 32); if (use_gdb_syscalls()) { m68k_semi_is_fseek = 1; gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x", ARG(0), off, ARG(3)); } else { off = lseek(ARG(0), off, ARG(3)); /* FIXME - handle put_user() failure */ put_user_u32(off >> 32, args); put_user_u32(off, args + 4); put_user_u32(errno, args + 8); } return; } case HOSTED_RENAME: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "rename,%s,%s", ARG(0), (int)ARG(1), ARG(2), (int)ARG(3)); return; } else { p = lock_user_string(ARG(0)); q = lock_user_string(ARG(2)); if (!p || !q) { /* FIXME - check error code? */ result = -1; } else { result = rename(p, q); } unlock_user(p, ARG(0), 0); unlock_user(q, ARG(2), 0); } break; case HOSTED_UNLINK: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "unlink,%s", ARG(0), (int)ARG(1)); return; } else { if (!(p = lock_user_string(ARG(0)))) { /* FIXME - check error code? */ result = -1; } else { result = unlink(p); unlock_user(p, ARG(0), 0); } } break; case HOSTED_STAT: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "stat,%s,%x", ARG(0), (int)ARG(1), ARG(2)); return; } else { struct stat s; if (!(p = lock_user_string(ARG(0)))) { /* FIXME - check error code? */ result = -1; } else { result = stat(p, &s); unlock_user(p, ARG(0), 0); } if (result == 0) { translate_stat(env, ARG(2), &s); } } break; case HOSTED_FSTAT: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x", ARG(0), ARG(1)); return; } else { struct stat s; result = fstat(ARG(0), &s); if (result == 0) { translate_stat(env, ARG(1), &s); } } break; case HOSTED_GETTIMEOFDAY: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x", ARG(0), ARG(1)); return; } else { qemu_timeval tv; struct gdb_timeval *p; result = qemu_gettimeofday(&tv); if (result != 0) { if (!(p = lock_user(VERIFY_WRITE, ARG(0), sizeof(struct gdb_timeval), 0))) { /* FIXME - check error code? */ result = -1; } else { p->tv_sec = cpu_to_be32(tv.tv_sec); p->tv_usec = cpu_to_be64(tv.tv_usec); unlock_user(p, ARG(0), sizeof(struct gdb_timeval)); } } } break; case HOSTED_ISATTY: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "isatty,%x", ARG(0)); return; } else { result = isatty(ARG(0)); } break; case HOSTED_SYSTEM: if (use_gdb_syscalls()) { gdb_do_syscall(m68k_semi_cb, "system,%s", ARG(0), (int)ARG(1)); return; } else { if (!(p = lock_user_string(ARG(0)))) { /* FIXME - check error code? */ result = -1; } else { result = system(p); unlock_user(p, ARG(0), 0); } } break; case HOSTED_INIT_SIM: #if defined(CONFIG_USER_ONLY) { TaskState *ts = env->opaque; /* Allocate the heap using sbrk. */ if (!ts->heap_limit) { long ret; uint32_t size; uint32_t base; base = do_brk(0); size = SEMIHOSTING_HEAP_SIZE; /* Try a big heap, and reduce the size if that fails. */ for (;;) { ret = do_brk(base + size); if (ret != -1) break; size >>= 1; } ts->heap_limit = base + size; } /* This call may happen before we have writable memory, so return values directly in registers. */ env->dregs[1] = ts->heap_limit; env->aregs[7] = ts->stack_base; } #else /* FIXME: This is wrong for boards where RAM does not start at address zero. */ env->dregs[1] = ram_size; env->aregs[7] = ram_size; #endif return; default: cpu_abort(env, "Unsupported semihosting syscall %d\n", nr); result = 0; } /* FIXME - handle put_user() failure */ put_user_u32(result, args); put_user_u32(errno, args + 4); }