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Subject[PATCH 4.4 28/37] sparc64: Prepare to move to more saner user copy exception handling.
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "David S. Miller" <davem@davemloft.net>


[ Upstream commit 83a17d2661674d8c198adc0e183418f72aabab79 ]

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: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/sparc/include/asm/uaccess_64.h | 21 +++++++++++++++------
arch/sparc/kernel/head_64.S | 23 +++++++++++------------
arch/sparc/lib/GENcopy_from_user.S | 2 +-
arch/sparc/lib/GENcopy_to_user.S | 2 +-
arch/sparc/lib/NG2copy_from_user.S | 4 ++--
arch/sparc/lib/NG2copy_to_user.S | 4 ++--
arch/sparc/lib/NG4copy_from_user.S | 4 ++--
arch/sparc/lib/NG4copy_to_user.S | 4 ++--
arch/sparc/lib/NGcopy_from_user.S | 2 +-
arch/sparc/lib/NGcopy_to_user.S | 2 +-
arch/sparc/lib/U1copy_from_user.S | 4 ++--
arch/sparc/lib/U1copy_to_user.S | 4 ++--
arch/sparc/lib/U3copy_from_user.S | 4 ++--
arch/sparc/lib/U3copy_to_user.S | 4 ++--
arch/sparc/lib/copy_in_user.S | 2 +-
15 files changed, 47 insertions(+), 39 deletions(-)

--- a/arch/sparc/include/asm/uaccess_64.h
+++ b/arch/sparc/include/asm/uaccess_64.h
@@ -211,8 +211,11 @@ copy_from_user(void *to, const void __us
{
unsigned long 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;
}
@@ -228,8 +231,11 @@ copy_to_user(void __user *to, const void
{
unsigned long 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
@@ -244,8 +250,11 @@ copy_in_user(void __user *to, void __use
{
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
--- a/arch/sparc/kernel/head_64.S
+++ b/arch/sparc/kernel/head_64.S
@@ -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
--- a/arch/sparc/lib/GENcopy_from_user.S
+++ b/arch/sparc/lib/GENcopy_from_user.S
@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
- .word 98b, __retl_one; \
+ .word 98b, __retl_mone; \
.text; \
.align 4;

--- a/arch/sparc/lib/GENcopy_to_user.S
+++ b/arch/sparc/lib/GENcopy_to_user.S
@@ -7,7 +7,7 @@
98: x; \
.section __ex_table,"a";\
.align 4; \
- .word 98b, __retl_one; \
+ .word 98b, __retl_mone; \
.text; \
.align 4;

--- a/arch/sparc/lib/NG2copy_from_user.S
+++ b/arch/sparc/lib/NG2copy_from_user.S
@@ -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;

--- a/arch/sparc/lib/NG2copy_to_user.S
+++ b/arch/sparc/lib/NG2copy_to_user.S
@@ -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;

--- a/arch/sparc/lib/NG4copy_from_user.S
+++ b/arch/sparc/lib/NG4copy_from_user.S
@@ -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;

--- a/arch/sparc/lib/NG4copy_to_user.S
+++ b/arch/sparc/lib/NG4copy_to_user.S
@@ -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;

--- a/arch/sparc/lib/NGcopy_from_user.S
+++ b/arch/sparc/lib/NGcopy_from_user.S
@@ -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;

--- a/arch/sparc/lib/NGcopy_to_user.S
+++ b/arch/sparc/lib/NGcopy_to_user.S
@@ -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;

--- a/arch/sparc/lib/U1copy_from_user.S
+++ b/arch/sparc/lib/U1copy_from_user.S
@@ -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;

--- a/arch/sparc/lib/U1copy_to_user.S
+++ b/arch/sparc/lib/U1copy_to_user.S
@@ -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;

--- a/arch/sparc/lib/U3copy_from_user.S
+++ b/arch/sparc/lib/U3copy_from_user.S
@@ -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;

--- a/arch/sparc/lib/U3copy_to_user.S
+++ b/arch/sparc/lib/U3copy_to_user.S
@@ -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;

--- a/arch/sparc/lib/copy_in_user.S
+++ b/arch/sparc/lib/copy_in_user.S
@@ -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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