diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/shared/irq/irq_asm.S')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/shared/irq/irq_asm.S | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/c/src/lib/libbsp/powerpc/shared/irq/irq_asm.S b/c/src/lib/libbsp/powerpc/shared/irq/irq_asm.S index a2be56d753..a87cd625ce 100644 --- a/c/src/lib/libbsp/powerpc/shared/irq/irq_asm.S +++ b/c/src/lib/libbsp/powerpc/shared/irq/irq_asm.S @@ -12,6 +12,9 @@ * Till Straumann <strauman@slac.stanford.edu>, 2003/7: * - store isr nesting level in _ISR_Nest_level rather than * SPRG0 - RTEMS relies on that variable. + * Till Straumann <strauman@slac.stanford.edu>, 2005/4: + * - DONT enable FP across ISR since fpregs are not saved!! + * FPU is used by Thread_Dispatch however... * * $Id$ */ @@ -95,11 +98,7 @@ SYM (shared_raw_irq_code_entry): * also, on CPUs with FP, enable FP so that FP context can be * saved and restored (using FP instructions) */ -#if (PPC_HAS_FPU == 0) ori r3, r3, MSR_RI | MSR_IR | MSR_DR -#else - ori r3, r3, MSR_RI | MSR_IR | MSR_DR | MSR_FP -#endif mtmsr r3 SYNC /* @@ -302,6 +301,27 @@ nested: rfi switch: +#if ( PPC_HAS_FPU != 0 ) +#if ! defined( CPU_USE_DEFERRED_FP_SWITCH ) +#error missing include file??? +#endif + mfmsr r4 +#if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE ) + /* if the executing thread has FP enabled propagate + * this now so _Thread_Dispatch can save/restore the FPREGS + * NOTE: it is *crucial* to disable the FPU across the + * user ISR [independent of using the 'deferred' + * strategy or not]. We don't save FP regs across + * the user ISR and hence we prefer an exception to + * be raised rather than experiencing corruption. + */ + lwz r3, SRR1_FRAME_OFFSET(r1) + rlwimi r4, r3, 0, 18, 18 /* MSR_FP */ +#else + ori r4, r4, MSR_FP +#endif + mtmsr r4 +#endif bl SYM (_Thread_Dispatch) easy_exit: |