| 235,19 → 235,54 |
|---|
| IPC_GET_ARG2(answer->data)); |
| IPC_SET_RETVAL(answer->data, rc); |
| } |
| } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_READ) { |
| ASSERT(!answer->buffer); |
| if (!IPC_GET_RETVAL(answer->data)) { |
| /* The recipient agreed to send data. */ |
| uintptr_t src = IPC_GET_ARG1(answer->data); |
| uintptr_t dst = IPC_GET_ARG1(*olddata); |
| size_t max_size = IPC_GET_ARG2(*olddata); |
| size_t size = IPC_GET_ARG2(answer->data); |
| if (size <= max_size) { |
| /* |
| * Copy the destination VA so that this piece of |
| * information is not lost. |
| */ |
| IPC_SET_ARG1(answer->data, dst); |
| |
| answer->buffer = malloc(size, 0); |
| int rc = copy_from_uspace(answer->buffer, |
| (void *) src, size); |
| if (rc) { |
| IPC_SET_RETVAL(answer->data, rc); |
| free(answer->buffer); |
| answer->buffer = NULL; |
| } |
| } else { |
| IPC_SET_RETVAL(answer->data, ELIMIT); |
| } |
| } |
| } else if (IPC_GET_METHOD(*olddata) == IPC_M_DATA_WRITE) { |
| ASSERT(answer->buffer); |
| if (!IPC_GET_RETVAL(answer->data)) { |
| /* The recipient agreed to receive data. */ |
| int rc; |
| uintptr_t dst; |
| uintptr_t size; |
| uintptr_t max_size; |
| |
| dst = IPC_GET_ARG1(answer->data); |
| size = IPC_GET_ARG3(answer->data); |
| max_size = IPC_GET_ARG3(*olddata); |
| |
| rc = copy_to_uspace((void *) dst, answer->buffer, size); |
| if (rc != 0) |
| IPC_SET_RETVAL(answer->data, rc); |
| if (size <= max_size) { |
| rc = copy_to_uspace((void *) dst, |
| answer->buffer, size); |
| if (rc) |
| IPC_SET_RETVAL(answer->data, rc); |
| } else { |
| IPC_SET_RETVAL(answer->data, ELIMIT); |
| } |
| } |
| free(answer->buffer); |
| answer->buffer = NULL; |
| 284,6 → 319,11 |
|---|
| return EPERM; |
| IPC_SET_ARG2(call->data, size); |
| break; |
| case IPC_M_DATA_READ: |
| size = IPC_GET_ARG2(call->data); |
| if ((size <= 0 || (size > DATA_XFER_LIMIT))) |
| return ELIMIT; |
| break; |
| case IPC_M_DATA_WRITE: |
| src = IPC_GET_ARG2(call->data); |
| size = IPC_GET_ARG3(call->data); |
| 324,6 → 364,17 |
|---|
| else |
| IPC_SET_ARG5(call->data, call->priv); |
| } |
| |
| if (call->buffer) { |
| /* This must be an affirmative answer to IPC_M_DATA_READ. */ |
| uintptr_t dst = IPC_GET_ARG1(call->data); |
| size_t size = IPC_GET_ARG2(call->data); |
| int rc = copy_to_uspace((void *) dst, call->buffer, size); |
| if (rc) |
| IPC_SET_RETVAL(call->data, rc); |
| free(call->buffer); |
| call->buffer = NULL; |
| } |
| } |
| |
| /** Do basic kernel processing of received call request. |