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sparc64: Convert copy_in_user to accurate exception reporting. 

Report the exact number of bytes which have not been successfully
copied when an exception occurs, using the running remaining length.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2016-08-15 15:08:18 -07:00
parent 83a17d2661
commit 0096ac9f47
1 changed files with 25 additions and 10 deletions
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35
arch/sparc/lib/copy_in_user.S
View File

@ -9,18 +9,33 @@
#define XCC xcc
#define EX(x,y) \
#define EX(x,y,z) \
98: x,y; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_mone; \
.word 98b, z; \
.text; \
.align 4;
#define EX_O4(x,y) EX(x,y,__retl_o4_plus_8)
#define EX_O2_4(x,y) EX(x,y,__retl_o2_plus_4)
#define EX_O2_1(x,y) EX(x,y,__retl_o2_plus_1)
.register %g2,#scratch
.register %g3,#scratch
.text
__retl_o4_plus_8:
add %o4, %o2, %o4
retl
add %o4, 8, %o0
__retl_o2_plus_4:
retl
add %o2, 4, %o0
__retl_o2_plus_1:
retl
add %o2, 1, %o0
.align 32
/* Don't try to get too fancy here, just nice and
@ -45,8 +60,8 @@ ENTRY(___copy_in_user) /* %o0=dst, %o1=src, %o2=len */
andn %o2, 0x7, %o4
and %o2, 0x7, %o2
1: subcc %o4, 0x8, %o4
EX(ldxa [%o1] %asi, %o5)
EX(stxa %o5, [%o0] %asi)
EX_O4(ldxa [%o1] %asi, %o5)
EX_O4(stxa %o5, [%o0] %asi)
add %o1, 0x8, %o1
bgu,pt %XCC, 1b
add %o0, 0x8, %o0
@ -54,8 +69,8 @@ ENTRY(___copy_in_user) /* %o0=dst, %o1=src, %o2=len */
be,pt %XCC, 1f
nop
sub %o2, 0x4, %o2
EX(lduwa [%o1] %asi, %o5)
EX(stwa %o5, [%o0] %asi)
EX_O2_4(lduwa [%o1] %asi, %o5)
EX_O2_4(stwa %o5, [%o0] %asi)
add %o1, 0x4, %o1
add %o0, 0x4, %o0
1: cmp %o2, 0
@ -71,8 +86,8 @@ ENTRY(___copy_in_user) /* %o0=dst, %o1=src, %o2=len */
82:
subcc %o2, 4, %o2
EX(lduwa [%o1] %asi, %g1)
EX(stwa %g1, [%o0] %asi)
EX_O2_4(lduwa [%o1] %asi, %g1)
EX_O2_4(stwa %g1, [%o0] %asi)
add %o1, 4, %o1
bgu,pt %XCC, 82b
add %o0, 4, %o0
@ -83,8 +98,8 @@ ENTRY(___copy_in_user) /* %o0=dst, %o1=src, %o2=len */
.align 32
90:
subcc %o2, 1, %o2
EX(lduba [%o1] %asi, %g1)
EX(stba %g1, [%o0] %asi)
EX_O2_1(lduba [%o1] %asi, %g1)
EX_O2_1(stba %g1, [%o0] %asi)
add %o1, 1, %o1
bgu,pt %XCC, 90b
add %o0, 1, %o0