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libmach

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rsc 2004-04-19 19:29:25 +00:00
parent 0e3cc9f456
commit a84cbb2a17
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65
src/libmach/fpformat.c Normal file
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#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mach.h>
/*
* Format floating point registers
*
* Register codes in format field:
* 'X' - print as 32-bit hexadecimal value
* 'F' - 64-bit double register when modif == 'F'; else 32-bit single reg
* 'f' - 32-bit ieee float
* '8' - big endian 80-bit ieee extended float
* '3' - little endian 80-bit ieee extended float with hole in bytes 8&9
*/
int
fpformat(Map *map, Regdesc *rp, char *buf, uint n, uint modif)
{
char reg[12];
u32int r;
switch(rp->format)
{
case 'X':
if (get4(map, rp->offset, &r) < 0)
return -1;
snprint(buf, n, "%lux", r);
break;
case 'F': /* first reg of double reg pair */
if (modif == 'F')
if ((rp->format=='F') || (((rp+1)->flags&RFLT) && (rp+1)->format == 'f')) {
if (get1(map, rp->offset, (uchar *)reg, 8) < 0)
return -1;
mach->ftoa64(buf, n, reg);
if (rp->format == 'F')
return 1;
return 2;
}
/* treat it like 'f' */
if (get1(map, rp->offset, (uchar *)reg, 4) < 0)
return -1;
mach->ftoa32(buf, n, reg);
break;
case 'f': /* 32 bit float */
if (get1(map, rp->offset, (uchar *)reg, 4) < 0)
return -1;
mach->ftoa32(buf, n, reg);
break;
case '3': /* little endian ieee 80 with hole in bytes 8&9 */
if (get1(map, rp->offset, (uchar *)reg, 10) < 0)
return -1;
memmove(reg+10, reg+8, 2); /* open hole */
memset(reg+8, 0, 2); /* fill it */
leieeeftoa80(buf, n, reg);
break;
case '8': /* big-endian ieee 80 */
if (get1(map, rp->offset, (uchar *)reg, 10) < 0)
return -1;
beieeeftoa80(buf, n, reg);
break;
default: /* unknown */
break;
}
return 1;
}