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Commit bf4d0da8 authored by David S. Miller's avatar David S. Miller Committed by Greg Kroah-Hartman
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sparc64: Prepare to move to more saner user copy exception handling. 

[ Upstream commit 83a17d26 ]

The fixup helper function mechanism for handling user copy fault
handling is not %100 accurrate, and can never be made so.

We are going to transition the code to return the running return
return length, which is always kept track in one or more registers
of each of these routines.

In order to convert them one by one, we have to allow the existing
behavior to continue functioning.

Therefore make all the copy code that wants the fixup helper to be
used return negative one.

After all of the user copy routines have been converted, this logic
and the fixup helpers themselves can be removed completely.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent bbbab9f5
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Inline Side-by-side
Showing with 47 additions and 39 deletions
arch/sparc/include/asm/uaccess_64.h
View file @ bf4d0da8
......@@ -214,8 +214,11 @@ copy_from_user(void *to, const void __user *from, unsigned long size)
check_object_size(to, size, false);
ret = ___copy_from_user(to, from, size);
if (unlikely(ret))
ret = copy_from_user_fixup(to, from, size);
if (unlikely(ret)) {
if ((long)ret < 0)
ret = copy_from_user_fixup(to, from, size);
return ret;
}
return ret;
}
......@@ -234,8 +237,11 @@ copy_to_user(void __user *to, const void *from, unsigned long size)
check_object_size(from, size, true);
ret = ___copy_to_user(to, from, size);
if (unlikely(ret))
ret = copy_to_user_fixup(to, from, size);
if (unlikely(ret)) {
if ((long)ret < 0)
ret = copy_to_user_fixup(to, from, size);
return ret;
}
return ret;
}
#define __copy_to_user copy_to_user
......@@ -250,8 +256,11 @@ copy_in_user(void __user *to, void __user *from, unsigned long size)
{
unsigned long ret = ___copy_in_user(to, from, size);
if (unlikely(ret))
ret = copy_in_user_fixup(to, from, size);
if (unlikely(ret)) {
if ((long)ret < 0)
ret = copy_in_user_fixup(to, from, size);
return ret;
}
return ret;
}
#define __copy_in_user copy_in_user
......
arch/sparc/kernel/head_64.S
View file @ bf4d0da8
......@@ -922,41 +922,40 @@ prom_tba: .xword 0
tlb_type: .word 0 /* Must NOT end up in BSS */
.section ".fixup",#alloc,#execinstr
.globl __retl_efault, __ret_one, __retl_one
ENTRY(__retl_efault)
retl
mov -EFAULT, %o0
ENDPROC(__retl_efault)
ENTRY(__retl_one)
ENTRY(__retl_mone)
retl
mov 1, %o0
ENDPROC(__retl_one)
mov -1, %o0
ENDPROC(__retl_mone)
ENTRY(__retl_one_fp)
ENTRY(__retl_mone_fp)
VISExitHalf
retl
mov 1, %o0
ENDPROC(__retl_one_fp)
ENDPROC(__retl_mone_fp)
ENTRY(__ret_one_asi)
ENTRY(__ret_mone_asi)
wr %g0, ASI_AIUS, %asi
ret
restore %g0, 1, %o0
ENDPROC(__ret_one_asi)
ENDPROC(__ret_mone_asi)
ENTRY(__retl_one_asi)
ENTRY(__retl_mone_asi)
wr %g0, ASI_AIUS, %asi
retl
mov 1, %o0
ENDPROC(__retl_one_asi)
ENDPROC(__retl_mone_asi)
ENTRY(__retl_one_asi_fp)
ENTRY(__retl_mone_asi_fp)
wr %g0, ASI_AIUS, %asi
VISExitHalf
retl
mov 1, %o0
ENDPROC(__retl_one_asi_fp)
ENDPROC(__retl_mone_asi_fp)
ENTRY(__retl_o1)
retl
......
arch/sparc/lib/GENcopy_from_user.S
View file @ bf4d0da8
......@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one; \
.word 98b, __retl_mone; \
.text; \
.align 4;
......
arch/sparc/lib/GENcopy_to_user.S
View file @ bf4d0da8
......@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one; \
.word 98b, __retl_mone; \
.text; \
.align 4;
......
arch/sparc/lib/NG2copy_from_user.S
View file @ bf4d0da8
......@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one_asi;\
.word 98b, __retl_mone_asi;\
.text; \
.align 4;
......@@ -15,7 +15,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one_asi_fp;\
.word 98b, __retl_mone_asi_fp;\
.text; \
.align 4;
......
arch/sparc/lib/NG2copy_to_user.S
View file @ bf4d0da8
......@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one_asi;\
.word 98b, __retl_mone_asi;\
.text; \
.align 4;
......@@ -15,7 +15,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one_asi_fp;\
.word 98b, __retl_mone_asi_fp;\
.text; \
.align 4;
......
arch/sparc/lib/NG4copy_from_user.S
View file @ bf4d0da8
......@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one_asi;\
.word 98b, __retl_mone_asi;\
.text; \
.align 4;
......@@ -15,7 +15,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one_asi_fp;\
.word 98b, __retl_mone_asi_fp;\
.text; \
.align 4;
......
arch/sparc/lib/NG4copy_to_user.S
View file @ bf4d0da8
......@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one_asi;\
.word 98b, __retl_mone_asi;\
.text; \
.align 4;
......@@ -15,7 +15,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one_asi_fp;\
.word 98b, __retl_mone_asi_fp;\
.text; \
.align 4;
......
arch/sparc/lib/NGcopy_from_user.S
View file @ bf4d0da8
......@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __ret_one_asi;\
.word 98b, __ret_mone_asi;\
.text; \
.align 4;
......
arch/sparc/lib/NGcopy_to_user.S
View file @ bf4d0da8
......@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __ret_one_asi;\
.word 98b, __ret_mone_asi;\
.text; \
.align 4;
......
arch/sparc/lib/U1copy_from_user.S
View file @ bf4d0da8
......@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one; \
.word 98b, __retl_mone; \
.text; \
.align 4;
......@@ -15,7 +15,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one_fp;\
.word 98b, __retl_mone_fp;\
.text; \
.align 4;
......
arch/sparc/lib/U1copy_to_user.S
View file @ bf4d0da8
......@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one; \
.word 98b, __retl_mone; \
.text; \
.align 4;
......@@ -15,7 +15,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one_fp;\
.word 98b, __retl_mone_fp;\
.text; \
.align 4;
......
arch/sparc/lib/U3copy_from_user.S
View file @ bf4d0da8
......@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one; \
.word 98b, __retl_mone; \
.text; \
.align 4;
......@@ -15,7 +15,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one_fp;\
.word 98b, __retl_mone_fp;\
.text; \
.align 4;
......
arch/sparc/lib/U3copy_to_user.S
View file @ bf4d0da8
......@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one; \
.word 98b, __retl_mone; \
.text; \
.align 4;
......@@ -15,7 +15,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one_fp;\
.word 98b, __retl_mone_fp;\
.text; \
.align 4;
......
arch/sparc/lib/copy_in_user.S
View file @ bf4d0da8
......@@ -12,7 +12,7 @@
98: x,y; \
.section __ex_table,"a";\
.align 4; \
.word 98b, __retl_one; \
.word 98b, __retl_mone; \
.text; \
.align 4;
......
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