fpformat.c (1627B)
1 #include <u.h> 2 #include <libc.h> 3 #include <bio.h> 4 #include <mach.h> 5 6 /* 7 * Format floating point registers 8 * 9 * Register codes in format field: 10 * 'X' - print as 32-bit hexadecimal value 11 * 'F' - 64-bit double register when modif == 'F'; else 32-bit single reg 12 * 'f' - 32-bit ieee float 13 * '8' - big endian 80-bit ieee extended float 14 * '3' - little endian 80-bit ieee extended float with hole in bytes 8&9 15 */ 16 int 17 fpformat(Map *map, Regdesc *rp, char *buf, uint n, uint modif) 18 { 19 char reg[12]; 20 u32int r; 21 22 switch(rp->format) 23 { 24 case 'X': 25 if (get4(map, rp->offset, &r) < 0) 26 return -1; 27 snprint(buf, n, "%lux", r); 28 break; 29 case 'F': /* first reg of double reg pair */ 30 if (modif == 'F') 31 if ((rp->format=='F') || (((rp+1)->flags&RFLT) && (rp+1)->format == 'f')) { 32 if (get1(map, rp->offset, (uchar *)reg, 8) < 0) 33 return -1; 34 mach->ftoa64(buf, n, reg); 35 if (rp->format == 'F') 36 return 1; 37 return 2; 38 } 39 /* treat it like 'f' */ 40 if (get1(map, rp->offset, (uchar *)reg, 4) < 0) 41 return -1; 42 mach->ftoa32(buf, n, reg); 43 break; 44 case 'f': /* 32 bit float */ 45 if (get1(map, rp->offset, (uchar *)reg, 4) < 0) 46 return -1; 47 mach->ftoa32(buf, n, reg); 48 break; 49 case '3': /* little endian ieee 80 with hole in bytes 8&9 */ 50 if (get1(map, rp->offset, (uchar *)reg, 10) < 0) 51 return -1; 52 memmove(reg+10, reg+8, 2); /* open hole */ 53 memset(reg+8, 0, 2); /* fill it */ 54 leieeeftoa80(buf, n, reg); 55 break; 56 case '8': /* big-endian ieee 80 */ 57 if (get1(map, rp->offset, (uchar *)reg, 10) < 0) 58 return -1; 59 beieeeftoa80(buf, n, reg); 60 break; 61 default: /* unknown */ 62 break; 63 } 64 return 1; 65 }