gwj / at91sam9263 · Commits

Commit 80c27194a7be757ef5a9cec978d1d8faaa4cee81

Authored by ths
1 parent a85427b1

Fix qemu SIGFPE caused by division-by-zero due to underflow. 


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2673 c046a42c-6fe2-441c-8c8c-71466251a162
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Showing 3 changed files with 28 additions and 13 deletions
target-mips/exec.h
  View file @80c2719
... ... @@ -82,6 +82,9 @@ void do_drotrv (void);
82 82 #endif
83 83 #endif
84 84  
  85 +#if HOST_LONG_BITS < 64
  86 +void do_div (void);
  87 +#endif
85 88 #if TARGET_LONG_BITS > HOST_LONG_BITS
86 89 void do_mult (void);
87 90 void do_multu (void);
... ... @@ -89,10 +92,12 @@ void do_madd (void);
89 92 void do_maddu (void);
90 93 void do_msub (void);
91 94 void do_msubu (void);
  95 +#endif
  96 +#ifdef TARGET_MIPS64
92 97 void do_ddiv (void);
  98 +#if TARGET_LONG_BITS > HOST_LONG_BITS
93 99 void do_ddivu (void);
94 100 #endif
95   -#ifdef TARGET_MIPS64
96 101 void do_dmult (void);
97 102 void do_dmultu (void);
98 103 #endif
... ...
target-mips/op.c
  View file @80c2719
... ... @@ -368,14 +368,22 @@ void op_mul (void)
368 368 RETURN();
369 369 }
370 370  
  371 +#if HOST_LONG_BITS < 64
  372 +void op_div (void)
  373 +{
  374 + CALL_FROM_TB0(do_div);
  375 + RETURN();
  376 +}
  377 +#else
371 378 void op_div (void)
372 379 {
373 380 if (T1 != 0) {
374   - env->LO = (int32_t)((int32_t)T0 / (int32_t)T1);
375   - env->HI = (int32_t)((int32_t)T0 % (int32_t)T1);
  381 + env->LO = (int32_t)((int64_t)(int32_t)T0 / (int32_t)T1);
  382 + env->HI = (int32_t)((int64_t)(int32_t)T0 % (int32_t)T1);
376 383 }
377 384 RETURN();
378 385 }
  386 +#endif
379 387  
380 388 void op_divu (void)
381 389 {
... ... @@ -432,7 +440,6 @@ void op_dmul (void)
432 440 RETURN();
433 441 }
434 442  
435   -#if TARGET_LONG_BITS > HOST_LONG_BITS
436 443 /* Those might call libgcc functions. */
437 444 void op_ddiv (void)
438 445 {
... ... @@ -440,21 +447,13 @@ void op_ddiv (void)
440 447 RETURN();
441 448 }
442 449  
  450 +#if TARGET_LONG_BITS > HOST_LONG_BITS
443 451 void op_ddivu (void)
444 452 {
445 453 do_ddivu();
446 454 RETURN();
447 455 }
448 456 #else
449   -void op_ddiv (void)
450   -{
451   - if (T1 != 0) {
452   - env->LO = (int64_t)T0 / (int64_t)T1;
453   - env->HI = (int64_t)T0 % (int64_t)T1;
454   - }
455   - RETURN();
456   -}
457   -
458 457 void op_ddivu (void)
459 458 {
460 459 if (T1 != 0) {
... ...
target-mips/op_helper.c
  View file @80c2719
... ... @@ -216,6 +216,17 @@ void do_msubu (void)
216 216 }
217 217 #endif
218 218  
  219 +#if HOST_LONG_BITS < 64
  220 +void do_div (void)
  221 +{
  222 + /* 64bit datatypes because we may see overflow/underflow. */
  223 + if (T1 != 0) {
  224 + env->LO = (int32_t)((int64_t)(int32_t)T0 / (int32_t)T1);
  225 + env->HI = (int32_t)((int64_t)(int32_t)T0 % (int32_t)T1);
  226 + }
  227 +}
  228 +#endif
  229 +
219 230 #ifdef TARGET_MIPS64
220 231 void do_dmult (void)
221 232 {
... ...