2008-05-20 03:52:27 +04:00
/ *
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* rtrap. S : P r e p a r i n g f o r r e t u r n f r o m t r a p o n S p a r c V 9 .
*
* Copyright ( C ) 1 9 9 7 ,1 9 9 8 J a k u b J e l i n e k ( j j @sunsite.mff.cuni.cz)
* Copyright ( C ) 1 9 9 7 D a v i d S . M i l l e r ( d a v e m @caip.rutgers.edu)
* /
# include < a s m / a s i . h >
# include < a s m / p s t a t e . h >
# include < a s m / p t r a c e . h >
# include < a s m / s p i t f i r e . h >
# include < a s m / h e a d . h >
# include < a s m / v i s a s m . h >
# include < a s m / p r o c e s s o r . h >
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# define R T R A P _ P S T A T E ( P S T A T E _ T S O | P S T A T E _ P E F | P S T A T E _ P R I V | P S T A T E _ I E )
# define R T R A P _ P S T A T E _ I R Q O F F ( P S T A T E _ T S O | P S T A T E _ P E F | P S T A T E _ P R I V )
# define R T R A P _ P S T A T E _ A G _ I R Q O F F ( P S T A T E _ T S O | P S T A T E _ P E F | P S T A T E _ P R I V | P S T A T E _ A G )
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.text
.align 32
__handle_preemption :
call s c h e d u l e
wrpr % g 0 , R T R A P _ P S T A T E , % p s t a t e
ba,p t % x c c , _ _ h a n d l e _ p r e e m p t i o n _ c o n t i n u e
wrpr % g 0 , R T R A P _ P S T A T E _ I R Q O F F , % p s t a t e
__handle_user_windows :
call f a u l t _ i n _ u s e r _ w i n d o w s
wrpr % g 0 , R T R A P _ P S T A T E , % p s t a t e
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ba,p t % x c c , _ _ h a n d l e _ p r e e m p t i o n _ c o n t i n u e
wrpr % g 0 , R T R A P _ P S T A T E _ I R Q O F F , % p s t a t e
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__handle_userfpu :
rd % f p r s , % l 5
andcc % l 5 , F P R S _ F E F , % g 0
sethi % h i ( T S T A T E _ P E F ) , % o 0
be,a ,p n % i c c , _ _ h a n d l e _ u s e r f p u _ c o n t i n u e
andn % l 1 , % o 0 , % l 1
ba,a ,p t % x c c , _ _ h a n d l e _ u s e r f p u _ c o n t i n u e
__handle_signal :
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mov % l 5 , % o 1
add % s p , P T R E G S _ O F F , % o 0
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mov % l 0 , % o 2
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call d o _ n o t i f y _ r e s u m e
wrpr % g 0 , R T R A P _ P S T A T E , % p s t a t e
wrpr % g 0 , R T R A P _ P S T A T E _ I R Q O F F , % p s t a t e
/ * Signal d e l i v e r y c a n m o d i f y p t _ r e g s t s t a t e , s o w e m u s t
* reload i t .
* /
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ T S T A T E ] , % l 1
sethi % h i ( 0 x f < < 2 0 ) , % l 4
and % l 1 , % l 4 , % l 4
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ba,p t % x c c , _ _ h a n d l e _ p r e e m p t i o n _ c o n t i n u e
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andn % l 1 , % l 4 , % l 1
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/ * When r e t u r n i n g f r o m a N M I ( % p i l = =15 ) i n t e r r u p t w e w a n t t o
* avoid r u n n i n g s o f t i r q s , d o i n g I R Q t r a c i n g , p r e e m p t i n g , e t c .
* /
.globl rtrap_nmi
rtrap_nmi : ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ T S T A T E ] , % l 1
sethi % h i ( 0 x f < < 2 0 ) , % l 4
and % l 1 , % l 4 , % l 4
andn % l 1 , % l 4 , % l 1
srl % l 4 , 2 0 , % l 4
ba,p t % x c c , r t r a p _ n o _ i r q _ e n a b l e
wrpr % l 4 , % p i l
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.align 64
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.globl _ i r q , r t r a p , i r q s z _ p a t c h m e , r t r a p _ x c a l l
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rtrap_irq :
rtrap :
/* mm/ultra.S:xcall_report_regs KNOWS about this load. */
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ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ T S T A T E ] , % l 1
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rtrap_xcall :
sethi % h i ( 0 x f < < 2 0 ) , % l 4
and % l 1 , % l 4 , % l 4
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andn % l 1 , % l 4 , % l 1
srl % l 4 , 2 0 , % l 4
# ifdef C O N F I G _ T R A C E _ I R Q F L A G S
brnz,p n % l 4 , r t r a p _ n o _ i r q _ e n a b l e
nop
call t r a c e _ h a r d i r q s _ o n
nop
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/ * Do n o t a c t u a l l y s e t t h e % p i l h e r e . W e w i l l d o t h a t
* below a f t e r w e c l e a r P S T A T E _ I E i n t h e % p s t a t e r e g i s t e r .
* If w e r e - e n a b l e i n t e r r u p t s h e r e , w e c a n r e c u r s e d o w n
* the h a r d i r q s t a c k p o t e n t i a l l y e n d l e s s l y , c a u s i n g a
* stack o v e r f l o w .
*
* It i s t e m p t i n g t o p u t t h i s t e s t a n d t r a c e _ h a r d i r q s _ o n
* call a t t h e ' r t _ c o n t i n u e ' l a b e l , b u t t h a t w i l l n o t w o r k
* as t h a t p a t h h i t s u n c o n d i t i o n a l l y a n d w e d o n o t w a n t t o
* execute t h i s i n N M I r e t u r n p a t h s , f o r e x a m p l e .
* /
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# endif
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rtrap_no_irq_enable :
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andcc % l 1 , T S T A T E _ P R I V , % l 3
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bne,p n % i c c , t o _ k e r n e l
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nop
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/ * We m u s t h o l d I R Q s o f f a n d a t o m i c a l l y t e s t s c h e d u l e + s i g n a l
* state, t h e n h o l d t h e m o f f a l l t h e w a y b a c k t o u s e r s p a c e .
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* If w e a r e r e t u r n i n g t o k e r n e l , n o n e o f t h i s m a t t e r s . N o t e
* that w e a r e d i s a b l i n g i n t e r r u p t s v i a P S T A T E _ I E , n o t u s i n g
* % pil.
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*
* If w e d o n o t d o t h i s , t h e r e i s a w i n d o w w h e r e w e w o u l d d o
* the t e s t s , l a t e r t h e s i g n a l / r e s c h e d e v e n t a r r i v e s b u t w e d o
* not p r o c e s s i t s i n c e w e a r e s t i l l i n k e r n e l m o d e . I t w o u l d
* take u n t i l t h e n e x t l o c a l I R Q b e f o r e t h e s i g n a l / r e s c h e d
* event w o u l d b e h a n d l e d .
*
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* This a l s o m e a n s t h a t i f w e h a v e t o d e a l w i t h u s e r
* windows, w e h a v e t o r e d o a l l o f t h e s e s c h e d + s i g n a l c h e c k s
* with I R Q s d i s a b l e d .
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* /
to_user : wrpr % g 0 , R T R A P _ P S T A T E _ I R Q O F F , % p s t a t e
wrpr 0 , % p i l
__handle_preemption_continue :
ldx [ % g 6 + T I _ F L A G S ] , % l 0
sethi % h i ( _ T I F _ U S E R _ W O R K _ M A S K ) , % o 0
or % o 0 , % l o ( _ T I F _ U S E R _ W O R K _ M A S K ) , % o 0
andcc % l 0 , % o 0 , % g 0
sethi % h i ( T S T A T E _ P E F ) , % o 0
be,p t % x c c , u s e r _ n o w o r k
andcc % l 1 , % o 0 , % g 0
andcc % l 0 , _ T I F _ N E E D _ R E S C H E D , % g 0
bne,p n % x c c , _ _ h a n d l e _ p r e e m p t i o n
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andcc % l 0 , _ T I F _ D O _ N O T I F Y _ R E S U M E _ M A S K , % g 0
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bne,p n % x c c , _ _ h a n d l e _ s i g n a l
ldub [ % g 6 + T I _ W S A V E D ] , % o 2
brnz,p n % o 2 , _ _ h a n d l e _ u s e r _ w i n d o w s
nop
sethi % h i ( T S T A T E _ P E F ) , % o 0
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andcc % l 1 , % o 0 , % g 0
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/* This fpdepth clear is necessary for non-syscall rtraps only */
user_nowork :
bne,p n % x c c , _ _ h a n d l e _ u s e r f p u
stb % g 0 , [ % g 6 + T I _ F P D E P T H ]
__handle_userfpu_continue :
rt_continue : ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ G 1 ] , % g 1
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ G 2 ] , % g 2
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ G 3 ] , % g 3
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ G 4 ] , % g 4
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ G 5 ] , % g 5
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brz,p t % l 3 , 1 f
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mov % g 6 , % l 2
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/* Must do this before thread reg is clobbered below. */
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LOAD_ P E R _ C P U _ B A S E ( % g 5 , % g 6 , % i 0 , % i 1 , % i 2 )
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1 :
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ G 6 ] , % g 6
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ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ G 7 ] , % g 7
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/* Normal globals are restored, go to trap globals. */
661 : wrpr % g 0 , R T R A P _ P S T A T E _ A G _ I R Q O F F , % p s t a t e
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nop
.section .sun4v_2insn_patch , " ax"
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.word 661b
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wrpr % g 0 , R T R A P _ P S T A T E _ I R Q O F F , % p s t a t e
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SET_ G L ( 1 )
.previous
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mov % l 2 , % g 6
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ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ I 0 ] , % i 0
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ I 1 ] , % i 1
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ I 2 ] , % i 2
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ I 3 ] , % i 3
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ I 4 ] , % i 4
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ I 5 ] , % i 5
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ I 6 ] , % i 6
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ I 7 ] , % i 7
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ T P C ] , % l 2
ldx [ % s p + P T R E G S _ O F F + P T _ V 9 _ T N P C ] , % o 2
ld [ % s p + P T R E G S _ O F F + P T _ V 9 _ Y ] , % o 3
wr % o 3 , % g 0 , % y
wrpr % l 4 , 0 x0 , % p i l
wrpr % g 0 , 0 x1 , % t l
sparc: Fix debugger syscall restart interactions.
So, forever, we've had this ptrace_signal_deliver implementation
which tries to handle all of the nasties that can occur when the
debugger looks at a process about to take a signal. It's meant
to address all of these issues inside of the kernel so that the
debugger need not be mindful of such things.
Problem is, this doesn't work.
The idea was that we should do the syscall restart business first, so
that the debugger captures that state. Otherwise, if the debugger for
example saves the child's state, makes the child execute something
else, then restores the saved state, we won't handle the syscall
restart properly because we lose the "we're in a syscall" state.
The code here worked for most cases, but if the debugger actually
passes the signal through to the child unaltered, it's possible that
we would do a syscall restart when we shouldn't have.
In particular this breaks the case of debugging a process under a gdb
which is being debugged by yet another gdb. gdb uses sigsuspend
to wait for SIGCHLD of the inferior, but if gdb itself is being
debugged by a top-level gdb we get a ptrace_stop(). The top-level gdb
does a PTRACE_CONT with SIGCHLD to let the inferior gdb see the
signal. But ptrace_signal_deliver() assumed the debugger would cancel
out the signal and therefore did a syscall restart, because the return
error was ERESTARTNOHAND.
Fix this by simply making ptrace_signal_deliver() a nop, and providing
a way for the debugger to control system call restarting properly:
1) Report a "in syscall" software bit in regs->{tstate,psr}.
It is set early on in trap entry to a system call and is fully
visible to the debugger via ptrace() and regsets.
2) Test this bit right before doing a syscall restart. We have
to do a final recheck right after get_signal_to_deliver() in
case the debugger cleared the bit during ptrace_stop().
3) Clear the bit in trap return so we don't accidently try to set
that bit in the real register.
As a result we also get a ptrace_{is,clear}_syscall() for sparc32 just
like sparc64 has.
M68K has this same exact bug, and is now the only other user of the
ptrace_signal_deliver hook. It needs to be fixed in the same exact
way as sparc.
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-05-11 13:07:19 +04:00
andn % l 1 , T S T A T E _ S Y S C A L L , % l 1
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wrpr % l 1 , % g 0 , % t s t a t e
wrpr % l 2 , % g 0 , % t p c
wrpr % o 2 , % g 0 , % t n p c
brnz,p n % l 3 , k e r n _ r t t
mov P R I M A R Y _ C O N T E X T , % l 7
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661 : ldxa [ % l 7 + % l 7 ] A S I _ D M M U , % l 0
.section .sun4v_1insn_patch , " ax"
.word 661b
ldxa [ % l 7 + % l 7 ] A S I _ M M U , % l 0
.previous
2005-10-05 02:23:20 +04:00
sethi % h i ( s p a r c64 _ k e r n _ p r i _ n u c _ b i t s ) , % l 1
ldx [ % l 1 + % l o ( s p a r c64 _ k e r n _ p r i _ n u c _ b i t s ) ] , % l 1
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or % l 0 , % l 1 , % l 0
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661 : stxa % l 0 , [ % l 7 ] A S I _ D M M U
.section .sun4v_1insn_patch , " ax"
.word 661b
stxa % l 0 , [ % l 7 ] A S I _ M M U
.previous
2006-02-01 05:33:00 +03:00
sethi % h i ( K E R N B A S E ) , % l 7
flush % l 7
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rdpr % w s t a t e , % l 1
rdpr % o t h e r w i n , % l 2
srl % l 1 , 3 , % l 1
wrpr % l 2 , % g 0 , % c a n r e s t o r e
wrpr % l 1 , % g 0 , % w s t a t e
2006-02-04 11:10:01 +03:00
brnz,p t % l 2 , u s e r _ r t t _ r e s t o r e
wrpr % g 0 , % g 0 , % o t h e r w i n
ldx [ % g 6 + T I _ F L A G S ] , % g 3
wr % g 0 , A S I _ A I U P , % a s i
rdpr % c w p , % g 1
andcc % g 3 , _ T I F _ 3 2 B I T , % g 0
sub % g 1 , 1 , % g 1
bne,p t % x c c , u s e r _ r t t _ f i l l _ 3 2 b i t
wrpr % g 1 , % c w p
ba,a ,p t % x c c , u s e r _ r t t _ f i l l _ 6 4 b i t
user_rtt_fill_fixup :
rdpr % c w p , % g 1
add % g 1 , 1 , % g 1
wrpr % g 1 , 0 x0 , % c w p
rdpr % w s t a t e , % g 2
sll % g 2 , 3 , % g 2
wrpr % g 2 , 0 x0 , % w s t a t e
/* We know %canrestore and %otherwin are both zero. */
sethi % h i ( s p a r c64 _ k e r n _ p r i _ c o n t e x t ) , % g 2
ldx [ % g 2 + % l o ( s p a r c64 _ k e r n _ p r i _ c o n t e x t ) ] , % g 2
mov P R I M A R Y _ C O N T E X T , % g 1
2006-02-08 09:13:05 +03:00
661 : stxa % g 2 , [ % g 1 ] A S I _ D M M U
.section .sun4v_1insn_patch , " ax"
.word 661b
stxa % g 2 , [ % g 1 ] A S I _ M M U
.previous
2006-02-04 11:10:01 +03:00
sethi % h i ( K E R N B A S E ) , % g 1
flush % g 1
or % g 4 , F A U L T _ C O D E _ W I N F I X U P , % g 4
stb % g 4 , [ % g 6 + T I _ F A U L T _ C O D E ]
stx % g 5 , [ % g 6 + T I _ F A U L T _ A D D R ]
mov % g 6 , % l 1
wrpr % g 0 , 0 x0 , % t l
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661 : nop
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.section .sun4v_1insn_patch , " ax"
2006-02-06 08:29:28 +03:00
.word 661b
SET_ G L ( 0 )
.previous
2006-02-23 03:15:45 +03:00
wrpr % g 0 , R T R A P _ P S T A T E , % p s t a t e
2006-02-04 11:10:01 +03:00
mov % l 1 , % g 6
ldx [ % g 6 + T I _ T A S K ] , % g 4
LOAD_ P E R _ C P U _ B A S E ( % g 5 , % g 6 , % g 1 , % g 2 , % g 3 )
call d o _ s p a r c64 _ f a u l t
add % s p , P T R E G S _ O F F , % o 0
ba,p t % x c c , r t r a p
nop
user_rtt_pre_restore :
add % g 1 , 1 , % g 1
wrpr % g 1 , 0 x0 , % c w p
user_rtt_restore :
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restore
rdpr % c a n r e s t o r e , % g 1
wrpr % g 1 , 0 x0 , % c l e a n w i n
retry
nop
2006-02-04 11:10:01 +03:00
kern_rtt : rdpr % c a n r e s t o r e , % g 1
brz,p n % g 1 , k e r n _ r t t _ f i l l
nop
kern_rtt_restore :
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stw % g 0 , [ % s p + P T R E G S _ O F F + P T _ V 9 _ M A G I C ]
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restore
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retry
2006-02-04 11:10:01 +03:00
2005-04-17 02:20:36 +04:00
to_kernel :
# ifdef C O N F I G _ P R E E M P T
ldsw [ % g 6 + T I _ P R E _ C O U N T ] , % l 5
brnz % l 5 , k e r n _ f p u c h e c k
ldx [ % g 6 + T I _ F L A G S ] , % l 5
andcc % l 5 , _ T I F _ N E E D _ R E S C H E D , % g 0
be,p t % x c c , k e r n _ f p u c h e c k
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nop
cmp % l 4 , 0
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bne,p n % x c c , k e r n _ f p u c h e c k
sethi % h i ( P R E E M P T _ A C T I V E ) , % l 6
stw % l 6 , [ % g 6 + T I _ P R E _ C O U N T ]
call s c h e d u l e
nop
ba,p t % x c c , r t r a p
stw % g 0 , [ % g 6 + T I _ P R E _ C O U N T ]
# endif
kern_fpucheck : ldub [ % g 6 + T I _ F P D E P T H ] , % l 5
brz,p t % l 5 , r t _ c o n t i n u e
srl % l 5 , 1 , % o 0
add % g 6 , T I _ F P S A V E D , % l 6
ldub [ % l 6 + % o 0 ] , % l 2
sub % l 5 , 2 , % l 5
add % g 6 , T I _ G S R , % o 1
andcc % l 2 , ( F P R S _ F E F | F P R S _ D U ) , % g 0
be,p t % i c c , 2 f
and % l 2 , F P R S _ D L , % l 6
andcc % l 2 , F P R S _ F E F , % g 0
be,p n % i c c , 5 f
sll % o 0 , 3 , % o 5
rd % f p r s , % g 1
wr % g 1 , F P R S _ F E F , % f p r s
ldx [ % o 1 + % o 5 ] , % g 1
add % g 6 , T I _ X F S R , % o 1
sll % o 0 , 8 , % o 2
add % g 6 , T I _ F P R E G S , % o 3
brz,p n % l 6 , 1 f
add % g 6 , T I _ F P R E G S + 0 x40 , % o 4
2005-10-08 00:30:49 +04:00
membar #S y n c
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ldda [ % o 3 + % o 2 ] A S I _ B L K _ P , % f0
ldda [ % o 4 + % o 2 ] A S I _ B L K _ P , % f16
2005-10-08 00:30:49 +04:00
membar #S y n c
2005-04-17 02:20:36 +04:00
1 : andcc % l 2 , F P R S _ D U , % g 0
be,p n % i c c , 1 f
wr % g 1 , 0 , % g s r
add % o 2 , 0 x80 , % o 2
2005-10-08 00:30:49 +04:00
membar #S y n c
2005-04-17 02:20:36 +04:00
ldda [ % o 3 + % o 2 ] A S I _ B L K _ P , % f32
ldda [ % o 4 + % o 2 ] A S I _ B L K _ P , % f48
1 : membar #S y n c
ldx [ % o 1 + % o 5 ] , % f s r
2 : stb % l 5 , [ % g 6 + T I _ F P D E P T H ]
ba,p t % x c c , r t _ c o n t i n u e
nop
5 : wr % g 0 , F P R S _ F E F , % f p r s
sll % o 0 , 8 , % o 2
add % g 6 , T I _ F P R E G S + 0 x80 , % o 3
add % g 6 , T I _ F P R E G S + 0 x c0 , % o 4
2005-10-08 00:30:49 +04:00
membar #S y n c
2005-04-17 02:20:36 +04:00
ldda [ % o 3 + % o 2 ] A S I _ B L K _ P , % f32
ldda [ % o 4 + % o 2 ] A S I _ B L K _ P , % f48
membar #S y n c
wr % g 0 , F P R S _ D U , % f p r s
ba,p t % x c c , r t _ c o n t i n u e
stb % l 5 , [ % g 6 + T I _ F P D E P T H ]
