[OSy] chybejici __udivdi3

[Josef Reidinger]

Zkousel sem tvoje reseni a vysledek neni moc dobry, mozna to jen spatne
pouzivam.

kod:
 unsigned long long tmp = tmr->usec*tics_per_second;
  dprintk(" usec: %u tps: %u \n",tmr->usec,tics_per_second);
  unsigned micro = 1000000;
  do_div(tmp,micro);

vysledek:
function timer_start: 113 -  usec: 2000000 tps: 7691029
function timer_start: 118 - counted ticks is 1780


Branislav Repček napsal(a):
> Zdravim,
> 
> ja som mal tiez tento problem a vyriesil som ho tak, ze som si
> "napisal" makro, ktore robi 64 bitove delenie za mna.
> 
> longdiv.h:
> 
> #ifndef LONGDIV_H
> #define LONGDIV_H
> 
> #include "types.h"
> 
> #define do_div64_32(res, high, low, base) ({ \
> 	unsigned long __quot32, __mod32; \
> 	unsigned long __cf, __tmp, __tmp2, __i; \
> 	\
> 	__asm__(".set	push\n\t" \
> 		".set	noat\n\t" \
> 		".set	noreorder\n\t" \

> 		"move	%2, $0\n\t" \

> 		"move	%3, $0\n\t" \

> 		"b	1f\n\t" \

> 		" li	%4, 0x21\n" \

> 		"0:\n\t" \

> 		"sll	$1, %0, 0x1\n\t" \

> 		"srl	%3, %0, 0x1f\n\t" \

> 		"or	%0, $1, %5\n\t" \

> 		"sll	%1, %1, 0x1\n\t" \

> 		"sll	%2, %2, 0x1\n" \

> 		"1:\n\t" \

> 		"bnez	%3, 2f\n\t" \

> 		" sltu	%5, %0, %z6\n\t" \

> 		"bnez	%5, 3f\n" \

> 		"2:\n\t" \

> 		" addiu	%4, %4, -1\n\t" \

> 		"subu	%0, %0, %z6\n\t" \

> 		"addiu	%2, %2, 1\n" \

> 		"3:\n\t" \

> 		"bnez	%4, 0b\n\t" \

> 		" srl	%5, %1, 0x1f\n\t" \

> 		".set	pop" \

> 		: "=&r" (__mod32), "=&r" (__tmp), \

> 		  "=&r" (__quot32), "=&r" (__cf), \

> 		  "=&r" (__i), "=&r" (__tmp2) \

> 		: "Jr" (base), "0" (high), "1" (low)); \

> 	\

> 	(res) = __quot32; \

> 	__mod32; })

> 

> #define do_div(n, base) ({ \

> 	unsigned long long __quot; \

> 	unsigned long __mod; \

> 	unsigned long long __div; \

> 	unsigned long __upper, __low, __high, __base; \

> 	\

> 	__div = (n); \

> 	__base = (base); \

> 	\

> 	__high = __div >> 32; \

> 	__low = __div; \

> 	__upper = __high; \

> 	\

> 	if (__high) \

> 		__asm__("divu	$0, %z2, %z3" \

> 			: "=h" (__upper), "=l" (__high) \

> 			: "Jr" (__high), "Jr" (__base) \

> 			: "$0"); \

> 	\

> 	__mod = do_div64_32(__low, __upper, __low, __base); \

> 	\

> 	__quot = __high; \

> 	__quot = __quot << 32 | __low; \

> 	(n) = __quot; \

> 	__mod; })

> 

> #endif

> 

> Tento kod je prakticky cely prebraty z
> linux-2.6.23.1/include/asm-mips/div64.h a zatial mi funguje bez
> problemov...
> 
> On Nov 3, 2007 2:33 PM, Zdeněk Doležal <zdenek.dolezal at gmail.com> wrote:
>> Ahoj,
>> nevim, zda je tohle stejny pripad jako nas, zkus make clean a
>> distclean a pak prolozit znovu. Delalo nam to podobnou chybu.
>>
>>
>> On 11/3/07, Josef Reidinger <josef.reidinger at seznam.cz> wrote:
>>> Ahoj,
>>> mam problem, ze pri prekladu deleni unsigned long long mi to pise
>>> .../prereq/timer.o: In function `timer_start'
>>> timer.c:(.text+0x4ac): undefined reference to `__udivdi3'
>>> timer.c:(.text+0x4ac): relocation truncated to fit: R_MIPS_26 against
>>> `__udivdi3
>>>
>>> pri googleni mi to naslo, ze by to melo byt v nejaky knihovne
>>> /lib/libuuid.so.1 ale tu jsem nenasel a nejde mi slinkovat tedy kernel.
>>> Netusite nekdo cim by se to dalo opravit?
>>>
>> --
>> S pozdravem
>> Zdenek Dolezal
>