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 va_end(arg); 35 printf("\n"); 36 } 37 38 printf("kernel on CPU %d: ", cpuid); 39 util_stacktrace(); 40 41 #if 0 42 if(get_cpulocal_var(proc_ptr)) { 43 printf("current process : "); 44 proc_stacktrace(get_cpulocal_var(proc_ptr)); 45 } 46 #endif 47 48 /* Abort MINIX. */ 49 minix_shutdown(0); 50 } 51 52 /*===========================================================================* 53 * kputc * 54 *===========================================================================*/ 55 void kputc( 56 int c /* character to append */ 57 ) 58 { 59 /* Accumulate a single character for a kernel message. Send a notification 60 * to the output drivers if an END_OF_KMESS is encountered. 61 */ 62 if (c != END_OF_KMESS) { 63 int maxblpos = sizeof(kmess.kmess_buf) - 2; 64 #ifdef DEBUG_SERIAL 65 if (kinfo.do_serial_debug) { 66 if(c == '\n') 67 ser_putc('\r'); 68 ser_putc(c); 69 } 70 #endif 71 kmess.km_buf[kmess.km_next] = c; /* put normal char in buffer */ 72 kmess.kmess_buf[kmess.blpos] = c; 73 if (kmess.km_size < sizeof(kmess.km_buf)) 74 kmess.km_size += 1; 75 kmess.km_next = (kmess.km_next + 1) % _KMESS_BUF_SIZE; 76 if(kmess.blpos == maxblpos) { 77 memmove(kmess.kmess_buf, 78 kmess.kmess_buf+1, sizeof(kmess.kmess_buf)-1); 79 } else kmess.blpos++; 80 } else if (!(kinfo.minix_panicing || kinfo.do_serial_debug)) { 81 send_diag_sig(); 82 } 83 } 84 85 /*===========================================================================* 86 * _exit * 87 *===========================================================================*/ 88 void _exit( 89 int e /* error code */ 90 ) 91 { 92 panic("_exit called from within the kernel, should not happen. (err %i)", e); 93 } 94