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2005-10-06 Till Straumann <strauman@slac.stanford.edu>

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PR 833/bsps
	* irq/irq_asm.S: Currently, all (new exception) BSPs explicitely enable
	the FPU across the user ISR but DONT save/restore the FPU context.
	Any use of the FPU fron the user handler (e.g., due to GCC
	optimizations) result in corruption. The fix results in an exception
	in such cases (user ISR must explicitely save/enable/restore FPU).
This commit is contained in:
Joel Sherrill
2005-10-06 19:36:09 +00:00
parent 6fa59698c7
commit 5d6e54d08b
8 changed files with 130 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
c/src/lib/libbsp/powerpc/eth_comm/ChangeLog
View File

@@ -1,3 +1,12 @@
2005-10-06 Till Straumann <strauman@slac.stanford.edu>
PR 833/bsps
* irq/irq_asm.S: Currently, all (new exception) BSPs explicitely enable
the FPU across the user ISR but DONT save/restore the FPU context.
Any use of the FPU fron the user handler (e.g., due to GCC
optimizations) result in corruption. The fix results in an exception
in such cases (user ISR must explicitely save/enable/restore FPU).
2003-12-19 Joel Sherrill <joel@OARcorp.com>
PR 545/bsps

29
c/src/lib/libbsp/powerpc/eth_comm/irq/irq_asm.S
View File

@@ -12,6 +12,8 @@
* 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 user USR since fpregs are never saved!!
*
* $Id$
*/
@@ -88,14 +90,8 @@ SYM (shared_raw_irq_code_entry):
/*
* Enable data and instruction address translation, exception recovery
*
* 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
/*
@@ -298,6 +294,27 @@ 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:

9
c/src/lib/libbsp/powerpc/mbx8xx/ChangeLog
View File

@@ -1,3 +1,12 @@
2005-10-06 Till Straumann <strauman@slac.stanford.edu>
PR 833/bsps
* irq/irq_asm.S: Currently, all (new exception) BSPs explicitely enable
the FPU across the user ISR but DONT save/restore the FPU context.
Any use of the FPU fron the user handler (e.g., due to GCC
optimizations) result in corruption. The fix results in an exception
in such cases (user ISR must explicitely save/enable/restore FPU).
2005-09-12 Thomas Doerfler <Thomas.Doerfler@imd-systems.de>
PR 527/bsps

27
c/src/lib/libbsp/powerpc/mbx8xx/irq/irq_asm.S
View File

@@ -12,6 +12,8 @@
* 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 user ISR since fpregs are never saved!!
*
* $Id$
*/
@@ -127,11 +129,7 @@ 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
/*
@@ -338,6 +336,27 @@ 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:

9
c/src/lib/libbsp/powerpc/mpc8260ads/ChangeLog
View File

@@ -1,3 +1,12 @@
2005-10-06 Till Straumann <strauman@slac.stanford.edu>
PR 833/bsps
* irq/irq_asm.S: Currently, all (new exception) BSPs explicitely enable
the FPU across the user ISR but DONT save/restore the FPU context.
Any use of the FPU fron the user handler (e.g., due to GCC
optimizations) result in corruption. The fix results in an exception
in such cases (user ISR must explicitely save/enable/restore FPU).
2004-09-27 Joel Sherrill <joel@OARcorp.com>
PR 680/bsps

28
c/src/lib/libbsp/powerpc/mpc8260ads/irq/irq_asm.S
View File

@@ -12,6 +12,9 @@
* Modifications to store nesting level in global _ISR_Nest_level
* variable instead of SPRG0. Andy Dachs <a.dachs@sstl.co.uk>
*
* Till Straumann <strauman@slac.stanford.edu>, 2005/4:
* - DONT enable FP across user ISR since fpregs are never saved!!
*
* $Id$
*/
@@ -93,11 +96,7 @@ 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
@@ -301,6 +300,27 @@ 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:

9
c/src/lib/libbsp/powerpc/shared/ChangeLog
View File

@@ -1,3 +1,12 @@
2005-10-06 Till Straumann <strauman@slac.stanford.edu>
PR 833/bsps
* irq/irq_asm.S: Currently, all (new exception) BSPs explicitely enable
the FPU across the user ISR but DONT save/restore the FPU context.
Any use of the FPU fron the user handler (e.g., due to GCC
optimizations) result in corruption. The fix results in an exception
in such cases (user ISR must explicitely save/enable/restore FPU).
2005-09-01 Joel Sherrill <joel@OARcorp.com>
* include/bsp.h: This file is only to be used by BSPs with the new

28
c/src/lib/libbsp/powerpc/shared/irq/irq_asm.S
View File

@@ -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: