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Date: Fri, 9 Aug 2013 15:38:43 -0400
From: Chris Metcalf <cmetcalf@...era.com>
To: <linux-kernel@...r.kernel.org>
CC: Simon Marchi <simon.marchi@...ymtl.ca>
Subject: [PATCH] tile: use proper .align directives on __ex_table sections
This may fix a reported bug where an R_TILEGX_64 in a module was not
pointing to an aligned address.
Reported-by: Simon Marchi <simon.marchi@...ymtl.ca>
Signed-off-by: Chris Metcalf <cmetcalf@...era.com>
---
arch/tile/include/asm/futex.h | 1 +
arch/tile/include/asm/uaccess.h | 6 ++++++
arch/tile/lib/atomic_asm_32.S | 1 +
arch/tile/lib/memcpy_32.S | 2 ++
arch/tile/lib/memcpy_user_64.c | 2 ++
arch/tile/lib/usercopy_32.S | 6 ++++++
arch/tile/lib/usercopy_64.S | 6 ++++++
7 files changed, 24 insertions(+)
diff --git a/arch/tile/include/asm/futex.h b/arch/tile/include/asm/futex.h
index 5909ac3..1a6ef1b 100644
--- a/arch/tile/include/asm/futex.h
+++ b/arch/tile/include/asm/futex.h
@@ -43,6 +43,7 @@
".pushsection .fixup,\"ax\"\n" \
"0: { movei %0, %5; j 9f }\n" \
".section __ex_table,\"a\"\n" \
+ ".align 8\n" \
".quad 1b, 0b\n" \
".popsection\n" \
"9:" \
diff --git a/arch/tile/include/asm/uaccess.h b/arch/tile/include/asm/uaccess.h
index f68503f..b6cde32 100644
--- a/arch/tile/include/asm/uaccess.h
+++ b/arch/tile/include/asm/uaccess.h
@@ -127,8 +127,10 @@ extern int fixup_exception(struct pt_regs *regs);
#ifdef __LP64__
#define _ASM_PTR ".quad"
+#define _ASM_ALIGN ".align 8"
#else
#define _ASM_PTR ".long"
+#define _ASM_ALIGN ".align 4"
#endif
#define __get_user_asm(OP, x, ptr, ret) \
@@ -137,6 +139,7 @@ extern int fixup_exception(struct pt_regs *regs);
"0: { movei %1, 0; movei %0, %3 }\n" \
"j 9f\n" \
".section __ex_table,\"a\"\n" \
+ _ASM_ALIGN "\n" \
_ASM_PTR " 1b, 0b\n" \
".popsection\n" \
"9:" \
@@ -168,6 +171,7 @@ extern int fixup_exception(struct pt_regs *regs);
"0: { movei %1, 0; movei %2, 0 }\n" \
"{ movei %0, %4; j 9f }\n" \
".section __ex_table,\"a\"\n" \
+ ".align 4\n" \
".word 1b, 0b\n" \
".word 2b, 0b\n" \
".popsection\n" \
@@ -224,6 +228,7 @@ extern int __get_user_bad(void)
".pushsection .fixup,\"ax\"\n" \
"0: { movei %0, %3; j 9f }\n" \
".section __ex_table,\"a\"\n" \
+ _ASM_ALIGN "\n" \
_ASM_PTR " 1b, 0b\n" \
".popsection\n" \
"9:" \
@@ -248,6 +253,7 @@ extern int __get_user_bad(void)
".pushsection .fixup,\"ax\"\n" \
"0: { movei %0, %4; j 9f }\n" \
".section __ex_table,\"a\"\n" \
+ ".align 4\n" \
".word 1b, 0b\n" \
".word 2b, 0b\n" \
".popsection\n" \
diff --git a/arch/tile/lib/atomic_asm_32.S b/arch/tile/lib/atomic_asm_32.S
index 3063804..6bda313 100644
--- a/arch/tile/lib/atomic_asm_32.S
+++ b/arch/tile/lib/atomic_asm_32.S
@@ -164,6 +164,7 @@ STD_ENTRY_SECTION(__atomic\name, .text.atomic)
STD_ENDPROC(__atomic\name)
.ifc \bitwidth,32
.pushsection __ex_table,"a"
+ .align 4
.word 1b, __atomic\name
.word 2b, __atomic\name
.word __atomic\name, __atomic_bad_address
diff --git a/arch/tile/lib/memcpy_32.S b/arch/tile/lib/memcpy_32.S
index 2a419a6..8ba7626 100644
--- a/arch/tile/lib/memcpy_32.S
+++ b/arch/tile/lib/memcpy_32.S
@@ -44,6 +44,7 @@
*/
#define EX \
.pushsection __ex_table, "a"; \
+ .align 4; \
.word 9f, memcpy_common_fixup; \
.popsection; \
9
@@ -614,5 +615,6 @@ memcpy_fixup_loop:
.size memcpy_common_fixup, . - memcpy_common_fixup
.section __ex_table,"a"
+ .align 4
.word .Lcfu, .Lcopy_from_user_fixup_zero_remainder
.word .Lctu, .Lcopy_to_user_fixup_done
diff --git a/arch/tile/lib/memcpy_user_64.c b/arch/tile/lib/memcpy_user_64.c
index 37440ca..88c7016 100644
--- a/arch/tile/lib/memcpy_user_64.c
+++ b/arch/tile/lib/memcpy_user_64.c
@@ -31,6 +31,7 @@
".pushsection .coldtext.memcpy,\"ax\";" \
"2: { move r0, %2; jrp lr };" \
".section __ex_table,\"a\";" \
+ ".align 8;" \
".quad 1b, 2b;" \
".popsection" \
: "=m" (*(p)) : "r" (v), "r" (n)); \
@@ -43,6 +44,7 @@
".pushsection .coldtext.memcpy,\"ax\";" \
"2: { move r0, %2; jrp lr };" \
".section __ex_table,\"a\";" \
+ ".align 8;" \
".quad 1b, 2b;" \
".popsection" \
: "=r" (__v) : "m" (*(p)), "r" (n)); \
diff --git a/arch/tile/lib/usercopy_32.S b/arch/tile/lib/usercopy_32.S
index 21ffa88..bb4c127b 100644
--- a/arch/tile/lib/usercopy_32.S
+++ b/arch/tile/lib/usercopy_32.S
@@ -36,6 +36,7 @@ strnlen_user_fault:
{ move r0, zero; jrp lr }
ENDPROC(strnlen_user_fault)
.section __ex_table,"a"
+ .align 4
.word 1b, strnlen_user_fault
.popsection
@@ -59,6 +60,7 @@ strncpy_from_user_fault:
{ movei r0, -EFAULT; jrp lr }
ENDPROC(strncpy_from_user_fault)
.section __ex_table,"a"
+ .align 4
.word 1b, strncpy_from_user_fault
.popsection
@@ -77,6 +79,7 @@ STD_ENTRY(clear_user_asm)
bnzt r1, 1b
2: { move r0, r1; jrp lr }
.pushsection __ex_table,"a"
+ .align 4
.word 1b, 2b
.popsection
@@ -86,6 +89,7 @@ STD_ENTRY(clear_user_asm)
2: { move r0, r1; jrp lr }
STD_ENDPROC(clear_user_asm)
.pushsection __ex_table,"a"
+ .align 4
.word 1b, 2b
.popsection
@@ -105,6 +109,7 @@ STD_ENTRY(flush_user_asm)
2: { move r0, r1; jrp lr }
STD_ENDPROC(flush_user_asm)
.pushsection __ex_table,"a"
+ .align 4
.word 1b, 2b
.popsection
@@ -124,5 +129,6 @@ STD_ENTRY(finv_user_asm)
2: { move r0, r1; jrp lr }
STD_ENDPROC(finv_user_asm)
.pushsection __ex_table,"a"
+ .align 4
.word 1b, 2b
.popsection
diff --git a/arch/tile/lib/usercopy_64.S b/arch/tile/lib/usercopy_64.S
index f248d31..0d94844e 100644
--- a/arch/tile/lib/usercopy_64.S
+++ b/arch/tile/lib/usercopy_64.S
@@ -36,6 +36,7 @@ strnlen_user_fault:
{ move r0, zero; jrp lr }
ENDPROC(strnlen_user_fault)
.section __ex_table,"a"
+ .align 8
.quad 1b, strnlen_user_fault
.popsection
@@ -59,6 +60,7 @@ strncpy_from_user_fault:
{ movei r0, -EFAULT; jrp lr }
ENDPROC(strncpy_from_user_fault)
.section __ex_table,"a"
+ .align 8
.quad 1b, strncpy_from_user_fault
.popsection
@@ -77,6 +79,7 @@ STD_ENTRY(clear_user_asm)
bnezt r1, 1b
2: { move r0, r1; jrp lr }
.pushsection __ex_table,"a"
+ .align 8
.quad 1b, 2b
.popsection
@@ -86,6 +89,7 @@ STD_ENTRY(clear_user_asm)
2: { move r0, r1; jrp lr }
STD_ENDPROC(clear_user_asm)
.pushsection __ex_table,"a"
+ .align 8
.quad 1b, 2b
.popsection
@@ -105,6 +109,7 @@ STD_ENTRY(flush_user_asm)
2: { move r0, r1; jrp lr }
STD_ENDPROC(flush_user_asm)
.pushsection __ex_table,"a"
+ .align 8
.quad 1b, 2b
.popsection
@@ -124,5 +129,6 @@ STD_ENTRY(finv_user_asm)
2: { move r0, r1; jrp lr }
STD_ENDPROC(finv_user_asm)
.pushsection __ex_table,"a"
+ .align 8
.quad 1b, 2b
.popsection
--
1.8.3.1
--
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