void FPU_printall()

in math-emu/errors.c [82:209]

• 116 lines of code
• 46 McCabe index (conditional complexity)

void FPU_printall(void)
{
	int i;
	static const char *tag_desc[] = { "Valid", "Zero", "ERROR", "Empty",
		"DeNorm", "Inf", "NaN"
	};
	u_char byte1, FPU_modrm;
	unsigned long address = FPU_ORIG_EIP;

	RE_ENTRANT_CHECK_OFF;
	/* No need to check access_ok(), we have previously fetched these bytes. */
	printk("At %p:", (void *)address);
	if (FPU_CS == __USER_CS) {
#define MAX_PRINTED_BYTES 20
		for (i = 0; i < MAX_PRINTED_BYTES; i++) {
			FPU_get_user(byte1, (u_char __user *) address);
			if ((byte1 & 0xf8) == 0xd8) {
				printk(" %02x", byte1);
				break;
			}
			printk(" [%02x]", byte1);
			address++;
		}
		if (i == MAX_PRINTED_BYTES)
			printk(" [more..]\n");
		else {
			FPU_get_user(FPU_modrm, 1 + (u_char __user *) address);

			if (FPU_modrm >= 0300)
				printk(" %02x (%02x+%d)\n", FPU_modrm,
				       FPU_modrm & 0xf8, FPU_modrm & 7);
			else
				printk(" /%d, mod=%d rm=%d\n",
				       (FPU_modrm >> 3) & 7,
				       (FPU_modrm >> 6) & 3, FPU_modrm & 7);
		}
	} else {
		printk("%04x\n", FPU_CS);
	}

	partial_status = status_word();

#ifdef DEBUGGING
	if (partial_status & SW_Backward)
		printk("SW: backward compatibility\n");
	if (partial_status & SW_C3)
		printk("SW: condition bit 3\n");
	if (partial_status & SW_C2)
		printk("SW: condition bit 2\n");
	if (partial_status & SW_C1)
		printk("SW: condition bit 1\n");
	if (partial_status & SW_C0)
		printk("SW: condition bit 0\n");
	if (partial_status & SW_Summary)
		printk("SW: exception summary\n");
	if (partial_status & SW_Stack_Fault)
		printk("SW: stack fault\n");
	if (partial_status & SW_Precision)
		printk("SW: loss of precision\n");
	if (partial_status & SW_Underflow)
		printk("SW: underflow\n");
	if (partial_status & SW_Overflow)
		printk("SW: overflow\n");
	if (partial_status & SW_Zero_Div)
		printk("SW: divide by zero\n");
	if (partial_status & SW_Denorm_Op)
		printk("SW: denormalized operand\n");
	if (partial_status & SW_Invalid)
		printk("SW: invalid operation\n");
#endif /* DEBUGGING */

	printk(" SW: b=%d st=%d es=%d sf=%d cc=%d%d%d%d ef=%d%d%d%d%d%d\n", partial_status & 0x8000 ? 1 : 0,	/* busy */
	       (partial_status & 0x3800) >> 11,	/* stack top pointer */
	       partial_status & 0x80 ? 1 : 0,	/* Error summary status */
	       partial_status & 0x40 ? 1 : 0,	/* Stack flag */
	       partial_status & SW_C3 ? 1 : 0, partial_status & SW_C2 ? 1 : 0,	/* cc */
	       partial_status & SW_C1 ? 1 : 0, partial_status & SW_C0 ? 1 : 0,	/* cc */
	       partial_status & SW_Precision ? 1 : 0,
	       partial_status & SW_Underflow ? 1 : 0,
	       partial_status & SW_Overflow ? 1 : 0,
	       partial_status & SW_Zero_Div ? 1 : 0,
	       partial_status & SW_Denorm_Op ? 1 : 0,
	       partial_status & SW_Invalid ? 1 : 0);

	printk(" CW: ic=%d rc=%d%d pc=%d%d iem=%d     ef=%d%d%d%d%d%d\n",
	       control_word & 0x1000 ? 1 : 0,
	       (control_word & 0x800) >> 11, (control_word & 0x400) >> 10,
	       (control_word & 0x200) >> 9, (control_word & 0x100) >> 8,
	       control_word & 0x80 ? 1 : 0,
	       control_word & SW_Precision ? 1 : 0,
	       control_word & SW_Underflow ? 1 : 0,
	       control_word & SW_Overflow ? 1 : 0,
	       control_word & SW_Zero_Div ? 1 : 0,
	       control_word & SW_Denorm_Op ? 1 : 0,
	       control_word & SW_Invalid ? 1 : 0);

	for (i = 0; i < 8; i++) {
		FPU_REG *r = &st(i);
		u_char tagi = FPU_gettagi(i);

		switch (tagi) {
		case TAG_Empty:
			continue;
		case TAG_Zero:
		case TAG_Special:
			/* Update tagi for the printk below */
			tagi = FPU_Special(r);
			fallthrough;
		case TAG_Valid:
			printk("st(%d)  %c .%04lx %04lx %04lx %04lx e%+-6d ", i,
			       getsign(r) ? '-' : '+',
			       (long)(r->sigh >> 16),
			       (long)(r->sigh & 0xFFFF),
			       (long)(r->sigl >> 16),
			       (long)(r->sigl & 0xFFFF),
			       exponent(r) - EXP_BIAS + 1);
			break;
		default:
			printk("Whoops! Error in errors.c: tag%d is %d ", i,
			       tagi);
			continue;
		}
		printk("%s\n", tag_desc[(int)(unsigned)tagi]);
	}

	RE_ENTRANT_CHECK_ON;

}