libmach
diff --git a/src/libmach/fpformat.c b/src/libmach/fpformat.c
new file mode 100644
index 0000000..a94a096
--- /dev/null
+++ b/src/libmach/fpformat.c
@@ -0,0 +1,65 @@
+#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;
+}
