1 /* This file contains a collection of miscellaneous procedures: 2 * panic: abort MINIX due to a fatal error 3 * kputc: buffered putc used by kernel printf 4 */ 5 6 #include "kernel/kernel.h" 7 #include "arch_proto.h" 8 9 #include <minix/syslib.h> 10 #include <unistd.h> 11 #include <stdarg.h> 12 #include <signal.h> 13 #include <string.h> 14 15 #include <minix/sys_config.h> 16 17 #define ARE_PANICING 0xDEADC0FF 18 19 /*===========================================================================* 20 * panic * 21 *===========================================================================*/ 22 void panic(const char *fmt, ...) 23 { 24 va_list arg; 25 /* The system has run aground of a fatal kernel error. Terminate execution. */ 26 if (kinfo.minix_panicing == ARE_PANICING) { 27 reset(); 28 } 29 kinfo.minix_panicing = ARE_PANICING; 30 if (fmt != NULL) { 31 printf("kernel panic: "); 32 va_start(arg, fmt); 33 vprintf(fmt, arg); 34 printf("\n"); 35 } 36 37 printf("kernel on CPU %d: ", cpuid); 38 util_stacktrace(); 39 40 #if 0 41 if(get_cpulocal_var(proc_ptr)) { 42 printf("current process : "); 43 proc_stacktrace(get_cpulocal_var(proc_ptr)); 44 } 45 #endif 46 47 /* Abort MINIX. */ 48 minix_shutdown(NULL); 49 } 50 51 /*===========================================================================* 52 * kputc * 53 *===========================================================================*/ 54 void kputc( 55 int c /* character to append */ 56 ) 57 { 58 /* Accumulate a single character for a kernel message. Send a notification 59 * to the output drivers if an END_OF_KMESS is encountered. 60 */ 61 if (c != END_OF_KMESS) { 62 int maxblpos = sizeof(kmess.kmess_buf) - 2; 63 #ifdef DEBUG_SERIAL 64 if (kinfo.do_serial_debug) { 65 if(c == '\n') 66 ser_putc('\r'); 67 ser_putc(c); 68 } 69 #endif 70 kmess.km_buf[kmess.km_next] = c; /* put normal char in buffer */ 71 kmess.kmess_buf[kmess.blpos] = c; 72 if (kmess.km_size < sizeof(kmess.km_buf)) 73 kmess.km_size += 1; 74 kmess.km_next = (kmess.km_next + 1) % _KMESS_BUF_SIZE; 75 if(kmess.blpos == maxblpos) { 76 memmove(kmess.kmess_buf, 77 kmess.kmess_buf+1, sizeof(kmess.kmess_buf)-1); 78 } else kmess.blpos++; 79 } else if (!(kinfo.minix_panicing || kinfo.do_serial_debug)) { 80 send_diag_sig(); 81 } 82 } 83 84 /*===========================================================================* 85 * _exit * 86 *===========================================================================*/ 87 void _exit( 88 int e /* error code */ 89 ) 90 { 91 panic("_exit called from within the kernel, should not happen. (err %i)", e); 92 } 93