gwj / at91sam9263 · Commits

Commit 1f1af9fd7f3fc83a3f933122f772d3a3f8663369

Authored by bellard
1 parent 858693c6

added cpu_get_fp80() and cpu_set_fp80() 


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@687 c046a42c-6fe2-441c-8c8c-71466251a162
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Showing 2 changed files with 62 additions and 2 deletions
target-i386/cpu.h
  View file @1f1af9f
... ... @@ -408,6 +408,10 @@ static inline void cpu_x86_set_cpl(CPUX86State *s, int cpl)
408 408 #endif
409 409 }
410 410  
  411 +/* used for debug or cpu save/restore */
  412 +void cpu_get_fp80(uint64_t *pmant, uint16_t *pexp, CPU86_LDouble f);
  413 +CPU86_LDouble cpu_set_fp80(uint64_t mant, uint16_t upper);
  414 +
411 415 /* the following helpers are only usable in user mode simulation as
412 416 they can trigger unexpected exceptions */
413 417 void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector);
... ...
target-i386/helper.c
  View file @1f1af9f
... ... @@ -2005,8 +2005,6 @@ void helper_fstt_ST0_A0(void)
2005 2005  
2006 2006 /* BCD ops */
2007 2007  
2008   -#define MUL10(iv) ( iv + iv + (iv << 3) )
2009   -
2010 2008 void helper_fbld_ST0_A0(void)
2011 2009 {
2012 2010 CPU86_LDouble tmp;
... ... @@ -2431,6 +2429,64 @@ void helper_frstor(uint8_t *ptr, int data32)
2431 2429 }
2432 2430 }
2433 2431  
  2432 +/* XXX: merge with helper_fstt ? */
  2433 +
  2434 +#ifndef USE_X86LDOUBLE
  2435 +
  2436 +void cpu_get_fp80(uint64_t *pmant, uint16_t *pexp, CPU86_LDouble f)
  2437 +{
  2438 + CPU86_LDoubleU temp;
  2439 + int e;
  2440 +
  2441 + temp.d = f;
  2442 + /* mantissa */
  2443 + *pmant = (MANTD(temp) << 11) | (1LL << 63);
  2444 + /* exponent + sign */
  2445 + e = EXPD(temp) - EXPBIAS + 16383;
  2446 + e |= SIGND(temp) >> 16;
  2447 + *pexp = e;
  2448 +}
  2449 +
  2450 +CPU86_LDouble cpu_set_fp80(uint64_t mant, uint16_t upper)
  2451 +{
  2452 + CPU86_LDoubleU temp;
  2453 + int e;
  2454 + uint64_t ll;
  2455 +
  2456 + /* XXX: handle overflow ? */
  2457 + e = (upper & 0x7fff) - 16383 + EXPBIAS; /* exponent */
  2458 + e |= (upper >> 4) & 0x800; /* sign */
  2459 + ll = (mant >> 11) & ((1LL << 52) - 1);
  2460 +#ifdef __arm__
  2461 + temp.l.upper = (e << 20) | (ll >> 32);
  2462 + temp.l.lower = ll;
  2463 +#else
  2464 + temp.ll = ll | ((uint64_t)e << 52);
  2465 +#endif
  2466 + return temp.d;
  2467 +}
  2468 +
  2469 +#else
  2470 +
  2471 +void cpu_get_fp80(uint64_t *pmant, uint16_t *pexp, CPU86_LDouble f)
  2472 +{
  2473 + CPU86_LDoubleU temp;
  2474 +
  2475 + temp.d = f;
  2476 + *pmant = temp.l.lower;
  2477 + *pexp = temp.l.upper;
  2478 +}
  2479 +
  2480 +CPU86_LDouble cpu_set_fp80(uint64_t mant, uint16_t upper)
  2481 +{
  2482 + CPU86_LDoubleU temp;
  2483 +
  2484 + temp.l.upper = upper;
  2485 + temp.l.lower = mant;
  2486 + return temp.d;
  2487 +}
  2488 +#endif
  2489 +
2434 2490 #if !defined(CONFIG_USER_ONLY)
2435 2491  
2436 2492 #define MMUSUFFIX _mmu
... ...