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Temporary band-aid to fix hang when a process exec's Altivec instructions.

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trap_subr.S:  declare a stub for the a-unavailable trap
              that does an absolute jump to the vector-assist trap.
              This is due to the fact that the vec-unavail trap
              doesn't start at a 256-byte boundary, so the trick of
              masking the bottom 8 bits of the link register to identify
              the interrupt doesn't work, so let the vec-assist
              case handle Altivec-disabled for the time being.

              Note that this will be fixed in the future with a much
              smaller vector code-stub (< 16 bytes) that will allow
              use of strange vector offsets that are also present in
              4xx processors, and also allow smaller differences in
              vector codepaths on the G5.

trap.c:       Treat altivec-unavailable/assist process traps as SIGILL.
              Not quite correct, since altivec-assist should really be a panic,
              but it is fine for the moment due to the above measure.

machdep.c     Install the stub code for the altivec-unavailable trap, and
              the standard trap code at the altivec-assist.

Reported by:	Andreas Tobler <toa at pop agri ch>
MFC after:	3 days
This commit is contained in:
Peter Grehan 2005-07-30 11:14:31 +00:00
parent 3419317c32
commit ebc2aa7496
6 changed files with 32 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
sys/powerpc/aim/machdep.c
View file

@ -247,6 +247,7 @@ extern void *dsitrap, *dsisize;
extern void *decrint, *decrsize;
extern void *extint, *extsize;
extern void *dblow, *dbsize;
extern void *vectrap, *vectrapsize;
void
powerpc_init(u_int startkernel, u_int endkernel, u_int basekernel, void *mdp)
@ -335,6 +336,8 @@ powerpc_init(u_int startkernel, u_int endkernel, u_int basekernel, void *mdp)
bcopy(&trapcode, (void *)EXC_SC, (size_t)&trapsize);
bcopy(&trapcode, (void *)EXC_TRC, (size_t)&trapsize);
bcopy(&trapcode, (void *)EXC_FPA, (size_t)&trapsize);
bcopy(&vectrap, (void *)EXC_VEC, (size_t)&vectrapsize);
bcopy(&trapcode, (void *)EXC_VECAST, (size_t)&trapsize);
bcopy(&trapcode, (void *)EXC_THRM, (size_t)&trapsize);
bcopy(&trapcode, (void *)EXC_BPT, (size_t)&trapsize);
#ifdef KDB

5
sys/powerpc/aim/trap.c
View file

@ -199,6 +199,11 @@ trap(struct trapframe *frame)
enable_vec(td);
frame->srr1 |= PSL_VEC;
break;
#else
case EXC_VEC:
case EXC_VECAST:
sig = SIGILL;
break;
#endif /* ALTIVEC */
case EXC_ALI:

8
sys/powerpc/aim/trap_subr.S
View file

@ -443,6 +443,14 @@ CNAME(trapexit):
FRAME_LEAVE(PC_TEMPSAVE)
rfi
/*
* Temporary: vector-unavailable traps are directed to vector-assist traps
*/
.globl CNAME(vectrap),CNAME(vectrapsize)
CNAME(vectrap):
ba EXC_VECAST
CNAME(vectrapsize) = .-CNAME(vectrap)
#if defined(KDB)
/*
* Deliberate entry to dbtrap

3
sys/powerpc/powerpc/machdep.c
View file

@ -247,6 +247,7 @@ extern void *dsitrap, *dsisize;
extern void *decrint, *decrsize;
extern void *extint, *extsize;
extern void *dblow, *dbsize;
extern void *vectrap, *vectrapsize;
void
powerpc_init(u_int startkernel, u_int endkernel, u_int basekernel, void *mdp)
@ -335,6 +336,8 @@ powerpc_init(u_int startkernel, u_int endkernel, u_int basekernel, void *mdp)
bcopy(&trapcode, (void *)EXC_SC, (size_t)&trapsize);
bcopy(&trapcode, (void *)EXC_TRC, (size_t)&trapsize);
bcopy(&trapcode, (void *)EXC_FPA, (size_t)&trapsize);
bcopy(&vectrap, (void *)EXC_VEC, (size_t)&vectrapsize);
bcopy(&trapcode, (void *)EXC_VECAST, (size_t)&trapsize);
bcopy(&trapcode, (void *)EXC_THRM, (size_t)&trapsize);
bcopy(&trapcode, (void *)EXC_BPT, (size_t)&trapsize);
#ifdef KDB

5
sys/powerpc/powerpc/trap.c
View file

@ -199,6 +199,11 @@ trap(struct trapframe *frame)
enable_vec(td);
frame->srr1 |= PSL_VEC;
break;
#else
case EXC_VEC:
case EXC_VECAST:
sig = SIGILL;
break;
#endif /* ALTIVEC */
case EXC_ALI:

8
sys/powerpc/powerpc/trap_subr.S
View file

@ -443,6 +443,14 @@ CNAME(trapexit):
FRAME_LEAVE(PC_TEMPSAVE)
rfi
/*
* Temporary: vector-unavailable traps are directed to vector-assist traps
*/
.globl CNAME(vectrap),CNAME(vectrapsize)
CNAME(vectrap):
ba EXC_VECAST
CNAME(vectrapsize) = .-CNAME(vectrap)
#if defined(KDB)
/*
* Deliberate entry to dbtrap