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| author | H. Peter Anvin <hpa@zytor.com> | 2012-04-20 16:57:35 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2012-04-20 16:57:35 -0700 |
| commit | 535c0c34698061544f81a51c65fc51f4eeeebff6 (patch) | |
| tree | 76f4ad3784af2be36407f5da28b8d1adb77b105a | |
| parent | a3e859fed1244b72253718e076a724ffe13a9584 (diff) | |
| download | linux-535c0c34698061544f81a51c65fc51f4eeeebff6.tar.gz linux-535c0c34698061544f81a51c65fc51f4eeeebff6.tar.bz2 linux-535c0c34698061544f81a51c65fc51f4eeeebff6.zip | |
x86, extable: Add _ASM_EXTABLE_EX() macro
Add _ASM_EXTABLE_EX() to generate the special extable entries that are
associated with uaccess_err. This allows us to change the protocol
associated with these special entries.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: David Daney <david.daney@cavium.com>
Link: http://lkml.kernel.org/r/CA%2B55aFyijf43qSu3N9nWHEBwaGbb7T2Oq9A=9EyR=Jtyqfq_cQ@mail.gmail.com
| -rw-r--r-- | arch/x86/include/asm/asm.h | 28 | ||||
| -rw-r--r-- | arch/x86/include/asm/uaccess.h | 8 |
2 files changed, 24 insertions, 12 deletions
diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h index 53dce41f2517..0f15e8a4f565 100644 --- a/arch/x86/include/asm/asm.h +++ b/arch/x86/include/asm/asm.h @@ -40,16 +40,28 @@ /* Exception table entry */ #ifdef __ASSEMBLY__ -# define _ASM_EXTABLE(from,to) \ - .pushsection "__ex_table","a" ; \ - _ASM_ALIGN ; \ - _ASM_PTR from , to ; \ +# define _ASM_EXTABLE(from,to) \ + .pushsection "__ex_table","a" ; \ + _ASM_ALIGN ; \ + _ASM_PTR from , to ; \ + .popsection + +# define _ASM_EXTABLE_EX(from,to) \ + .pushsection "__ex_table","a" ; \ + _ASM_ALIGN ; \ + _ASM_PTR from , (to) - (from) ; \ .popsection #else -# define _ASM_EXTABLE(from,to) \ - " .pushsection \"__ex_table\",\"a\"\n" \ - _ASM_ALIGN "\n" \ - _ASM_PTR #from "," #to "\n" \ +# define _ASM_EXTABLE(from,to) \ + " .pushsection \"__ex_table\",\"a\"\n" \ + _ASM_ALIGN "\n" \ + _ASM_PTR #from "," #to "\n" \ + " .popsection\n" + +# define _ASM_EXTABLE_EX(from,to) \ + " .pushsection \"__ex_table\",\"a\"\n" \ + _ASM_ALIGN "\n" \ + _ASM_PTR #from ",(" #to ")-(" #from ")\n" \ " .popsection\n" #endif diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index e0544597cfe7..4ee59dd66f5d 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -202,8 +202,8 @@ extern int __get_user_bad(void); asm volatile("1: movl %%eax,0(%1)\n" \ "2: movl %%edx,4(%1)\n" \ "3:\n" \ - _ASM_EXTABLE(1b, 2b - 1b) \ - _ASM_EXTABLE(2b, 3b - 2b) \ + _ASM_EXTABLE_EX(1b, 2b) \ + _ASM_EXTABLE_EX(2b, 3b) \ : : "A" (x), "r" (addr)) #define __put_user_x8(x, ptr, __ret_pu) \ @@ -408,7 +408,7 @@ do { \ #define __get_user_asm_ex(x, addr, itype, rtype, ltype) \ asm volatile("1: mov"itype" %1,%"rtype"0\n" \ "2:\n" \ - _ASM_EXTABLE(1b, 2b - 1b) \ + _ASM_EXTABLE_EX(1b, 2b) \ : ltype(x) : "m" (__m(addr))) #define __put_user_nocheck(x, ptr, size) \ @@ -450,7 +450,7 @@ struct __large_struct { unsigned long buf[100]; }; #define __put_user_asm_ex(x, addr, itype, rtype, ltype) \ asm volatile("1: mov"itype" %"rtype"0,%1\n" \ "2:\n" \ - _ASM_EXTABLE(1b, 2b - 1b) \ + _ASM_EXTABLE_EX(1b, 2b) \ : : ltype(x), "m" (__m(addr))) /* |