1/* 2 * Copyright 2017, Data61 3 * Commonwealth Scientific and Industrial Research Organisation (CSIRO) 4 * ABN 41 687 119 230. 5 * 6 * This software may be distributed and modified according to the terms of 7 * the BSD 2-Clause license. Note that NO WARRANTY is provided. 8 * See "LICENSE_BSD2.txt" for details. 9 * 10 * @TAG(DATA61_BSD) 11 */ 12 13#include <sel4debug/debug.h> 14#include <sel4/sel4.h> 15#include <stdarg.h> 16#include <stdio.h> 17 18int 19debug_safe_printf(const char *format, ...) 20{ 21 seL4_IPCBuffer shadow_buffer; /* XXX: Should we avoid allocating 22 * this large struct on the stack? 23 */ 24 25 /* Assume that the standard printf may clobber the IPC buffer, so save it 26 * before. 27 */ 28 shadow_buffer = *(seL4_GetIPCBuffer()); 29 30 /* Copied from printf: */ 31 int ret; 32 va_list ap; 33 34 va_start(ap, format); 35 ret = vfprintf(stdout, format, ap); 36 va_end(ap); 37 38 /* Now restore the IPC buffer. */ 39 *(seL4_GetIPCBuffer()) = shadow_buffer; 40 41 return ret; 42} 43