Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-17 01:22:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

x86, extable: Add _ASM_EXTABLE_EX() macro

Browse Source 
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
This commit is contained in:
H. Peter Anvin 2012-04-20 16:57:35 -07:00
parent a3e859fed1
commit 535c0c3469
2 changed files with 24 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
arch/x86/include/asm/asm.h
View File

@ -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

8
arch/x86/include/asm/uaccess.h
View File

@ -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)))
/*