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Commit 0096ac9f authored by David S. Miller's avatar David S. Miller
Browse files

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: default avatarDavid S. Miller <davem@davemloft.net>
parent 83a17d26
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+25 −10
Original line number Diff line number Diff line
@@ -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