mirror of
https://github.com/9fans/plan9port.git
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66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <mach.h>
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/*
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* Format floating point registers
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*
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* Register codes in format field:
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* 'X' - print as 32-bit hexadecimal value
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* 'F' - 64-bit double register when modif == 'F'; else 32-bit single reg
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* 'f' - 32-bit ieee float
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* '8' - big endian 80-bit ieee extended float
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* '3' - little endian 80-bit ieee extended float with hole in bytes 8&9
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*/
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int
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fpformat(Map *map, Regdesc *rp, char *buf, uint n, uint modif)
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{
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char reg[12];
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u32int r;
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switch(rp->format)
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{
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case 'X':
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if (get4(map, rp->offset, &r) < 0)
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return -1;
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snprint(buf, n, "%lux", r);
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break;
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case 'F': /* first reg of double reg pair */
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if (modif == 'F')
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if ((rp->format=='F') || (((rp+1)->flags&RFLT) && (rp+1)->format == 'f')) {
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if (get1(map, rp->offset, (uchar *)reg, 8) < 0)
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return -1;
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mach->ftoa64(buf, n, reg);
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if (rp->format == 'F')
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return 1;
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return 2;
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}
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/* treat it like 'f' */
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if (get1(map, rp->offset, (uchar *)reg, 4) < 0)
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return -1;
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mach->ftoa32(buf, n, reg);
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break;
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case 'f': /* 32 bit float */
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if (get1(map, rp->offset, (uchar *)reg, 4) < 0)
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return -1;
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mach->ftoa32(buf, n, reg);
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break;
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case '3': /* little endian ieee 80 with hole in bytes 8&9 */
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if (get1(map, rp->offset, (uchar *)reg, 10) < 0)
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return -1;
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memmove(reg+10, reg+8, 2); /* open hole */
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memset(reg+8, 0, 2); /* fill it */
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leieeeftoa80(buf, n, reg);
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break;
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case '8': /* big-endian ieee 80 */
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if (get1(map, rp->offset, (uchar *)reg, 10) < 0)
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return -1;
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beieeeftoa80(buf, n, reg);
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break;
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default: /* unknown */
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break;
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}
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return 1;
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}
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