| rsc | a84cbb2 | 2004-04-19 19:29:25 +0000 | [diff] [blame] | 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 | } |
