Jan Beulich
2010-Dec-23 12:57 UTC
[Xen-devel] [PATCH 2/3] x86-64: use PC-relative exception table entries
... thus allowing to make the entries half their current size. Rather
than adjusting all instances to the new layout, abstract the
construction the table entries via a macro (paralleling a similar one
in recent Linux).
Also change the name of the section (to allow easier detection of
missed cases) and merge the final resulting output sections into
.data.read_mostly.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
--- 2010-12-23.orig/xen/arch/x86/cpu/amd.c
+++ 2010-12-23/xen/arch/x86/cpu/amd.c
@@ -53,10 +53,7 @@ static inline int rdmsr_amd_safe(unsigne
"3: movl %6,%2\n"
" jmp 2b\n"
".previous\n"
- ".section __ex_table,\"a\"\n"
- __FIXUP_ALIGN "\n"
- __FIXUP_WORD " 1b,3b\n"
- ".previous\n"
+ _ASM_EXTABLE(1b, 3b)
: "=a" (*lo), "=d" (*hi), "=r" (err)
: "c" (msr), "D" (0x9c5a203a), "2" (0),
"i" (-EFAULT));
@@ -73,10 +70,7 @@ static inline int wrmsr_amd_safe(unsigne
"3: movl %6,%0\n"
" jmp 2b\n"
".previous\n"
- ".section __ex_table,\"a\"\n"
- __FIXUP_ALIGN "\n"
- __FIXUP_WORD " 1b,3b\n"
- ".previous\n"
+ _ASM_EXTABLE(1b, 3b)
: "=r" (err)
: "c" (msr), "a" (lo), "d" (hi),
"D" (0x9c5a203a),
"0" (0), "i" (-EFAULT));
--- 2010-12-23.orig/xen/arch/x86/domain.c
+++ 2010-12-23/xen/arch/x86/domain.c
@@ -1070,10 +1070,7 @@ arch_do_vcpu_op(
" movl %k0,%%" #seg "\n" \
" jmp 2b\n" \
".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " .align 8\n" \
- " .quad 1b,3b\n" \
- ".previous" \
+ _ASM_EXTABLE(1b, 3b) \
: "=r" (__r) : "r" (value), "0" (__r) );\
__r; })
--- 2010-12-23.orig/xen/arch/x86/extable.c
+++ 2010-12-23/xen/arch/x86/extable.c
@@ -2,6 +2,7 @@
#include <xen/config.h>
#include <xen/init.h>
#include <xen/perfc.h>
+#include <xen/sort.h>
#include <xen/spinlock.h>
#include <asm/uaccess.h>
@@ -10,29 +11,58 @@ extern struct exception_table_entry __st
extern struct exception_table_entry __start___pre_ex_table[];
extern struct exception_table_entry __stop___pre_ex_table[];
-static void __init sort_exception_table(struct exception_table_entry *start,
- struct exception_table_entry *end)
+#ifdef __i386__
+#define EX_FIELD(ptr, field) (ptr)->field
+#define swap_ex NULL
+#else
+#define EX_FIELD(ptr, field) ((unsigned long)&(ptr)->field +
(ptr)->field)
+#endif
+
+static inline unsigned long ex_addr(const struct exception_table_entry *x)
{
- struct exception_table_entry *p, *q, tmp;
+ return EX_FIELD(x, addr);
+}
- for ( p = start; p < end; p++ )
- {
- for ( q = p-1; q > start; q-- )
- if ( p->insn > q->insn )
- break;
- if ( ++q != p )
- {
- tmp = *p;
- memmove(q+1, q, (p-q)*sizeof(*p));
- *q = tmp;
- }
- }
+static inline unsigned long ex_cont(const struct exception_table_entry *x)
+{
+ return EX_FIELD(x, cont);
+}
+
+static int __init cmp_ex(const void *a, const void *b)
+{
+ const struct exception_table_entry *l = a, *r = b;
+ unsigned long lip = ex_addr(l);
+ unsigned long rip = ex_addr(r);
+
+ /* avoid overflow */
+ if (lip > rip)
+ return 1;
+ if (lip < rip)
+ return -1;
+ return 0;
+}
+
+#ifndef swap_ex
+static void __init swap_ex(void *a, void *b, int size)
+{
+ struct exception_table_entry *l = a, *r = b, tmp;
+ long delta = b - a;
+
+ tmp = *l;
+ l->addr = r->addr + delta;
+ l->cont = r->cont + delta;
+ r->addr = tmp.addr - delta;
+ r->cont = tmp.cont - delta;
}
+#endif
void __init sort_exception_tables(void)
{
- sort_exception_table(__start___ex_table, __stop___ex_table);
- sort_exception_table(__start___pre_ex_table, __stop___pre_ex_table);
+ sort(__start___ex_table, __stop___ex_table - __start___ex_table,
+ sizeof(struct exception_table_entry), cmp_ex, swap_ex);
+ sort(__start___pre_ex_table,
+ __stop___pre_ex_table - __start___pre_ex_table,
+ sizeof(struct exception_table_entry), cmp_ex, swap_ex);
}
static inline unsigned long
@@ -46,9 +76,9 @@ search_one_table(const struct exception_
while ( first <= last )
{
mid = (last - first) / 2 + first;
- diff = mid->insn - value;
+ diff = ex_addr(mid) - value;
if (diff == 0)
- return mid->fixup;
+ return ex_cont(mid);
else if (diff < 0)
first = mid+1;
else
--- 2010-12-23.orig/xen/arch/x86/i387.c
+++ 2010-12-23/xen/arch/x86/i387.c
@@ -122,10 +122,7 @@ void restore_fpu(struct vcpu *v)
" pop %%"__OP"ax \n"
" jmp 1b \n"
".previous \n"
- ".section __ex_table,\"a\"\n"
- " "__FIXUP_ALIGN" \n"
- " "__FIXUP_WORD" 1b,2b \n"
- ".previous \n"
+ _ASM_EXTABLE(1b, 2b)
:
: "m" (*fpu_ctxt),
"i" (sizeof(v->arch.guest_context.fpu_ctxt)/4)
--- 2010-12-23.orig/xen/arch/x86/usercopy.c
+++ 2010-12-23/xen/arch/x86/usercopy.c
@@ -36,12 +36,9 @@ unsigned long __copy_to_user_ll(void __u
"3: lea 0(%3,%0,"STR(BYTES_PER_LONG)"),%0\n"
" jmp 2b\n"
".previous\n"
- ".section __ex_table,\"a\"\n"
- " "__FIXUP_ALIGN"\n"
- " "__FIXUP_WORD" 4b,5b\n"
- " "__FIXUP_WORD" 0b,3b\n"
- " "__FIXUP_WORD" 1b,2b\n"
- ".previous"
+ _ASM_EXTABLE(4b, 5b)
+ _ASM_EXTABLE(0b, 3b)
+ _ASM_EXTABLE(1b, 2b)
: "=&c" (__n), "=&D" (__d0),
"=&S" (__d1), "=&r" (__d2)
: "0" (__n), "1" (to), "2" (from),
"3" (__n)
: "memory" );
@@ -82,12 +79,9 @@ __copy_from_user_ll(void *to, const void
" pop %0\n"
" jmp 2b\n"
".previous\n"
- ".section __ex_table,\"a\"\n"
- " "__FIXUP_ALIGN"\n"
- " "__FIXUP_WORD" 4b,5b\n"
- " "__FIXUP_WORD" 0b,3b\n"
- " "__FIXUP_WORD" 1b,6b\n"
- ".previous"
+ _ASM_EXTABLE(4b, 5b)
+ _ASM_EXTABLE(0b, 3b)
+ _ASM_EXTABLE(1b, 6b)
: "=&c" (__n), "=&D" (__d0),
"=&S" (__d1), "=&r" (__d2)
: "0" (__n), "1" (to), "2" (from),
"3" (__n)
: "memory" );
--- 2010-12-23.orig/xen/arch/x86/x86_32/asm-offsets.c
+++ 2010-12-23/xen/arch/x86/x86_32/asm-offsets.c
@@ -3,6 +3,7 @@
* This code generates raw asm output which is post-processed
* to extract and format the required data.
*/
+#define COMPILE_OFFSETS
#include <xen/config.h>
#include <xen/perfc.h>
--- 2010-12-23.orig/xen/arch/x86/x86_32/entry.S
+++ 2010-12-23/xen/arch/x86/x86_32/entry.S
@@ -119,16 +119,12 @@ failsafe_callback:
movl %eax,UREGS_gs(%esp)
jmp test_all_events
.previous
-.section __pre_ex_table,"a"
- .long .Lft1,.Lfx1
- .long .Lft2,.Lfx1
- .long .Lft3,.Lfx1
- .long .Lft4,.Lfx1
- .long .Lft5,.Lfx1
-.previous
-.section __ex_table,"a"
- .long .Ldf1,failsafe_callback
-.previous
+ _ASM_PRE_EXTABLE(.Lft1, .Lfx1)
+ _ASM_PRE_EXTABLE(.Lft2, .Lfx1)
+ _ASM_PRE_EXTABLE(.Lft3, .Lfx1)
+ _ASM_PRE_EXTABLE(.Lft4, .Lfx1)
+ _ASM_PRE_EXTABLE(.Lft5, .Lfx1)
+ _ASM_EXTABLE(.Ldf1, failsafe_callback)
ALIGN
restore_all_xen:
@@ -392,18 +388,26 @@ UNLIKELY_END(bounce_vm86_3)
movl TRAPBOUNCE_eip(%edx),%eax
movl %eax,UREGS_eip+4(%esp)
ret
-.section __ex_table,"a"
- .long .Lft6,domain_crash_synchronous , .Lft7,domain_crash_synchronous
- .long .Lft8,domain_crash_synchronous , .Lft9,domain_crash_synchronous
- .long .Lft10,domain_crash_synchronous , .Lft11,domain_crash_synchronous
- .long .Lft12,domain_crash_synchronous , .Lft13,domain_crash_synchronous
- .long .Lft14,domain_crash_synchronous , .Lft15,domain_crash_synchronous
- .long .Lft16,domain_crash_synchronous , .Lft17,domain_crash_synchronous
- .long .Lft18,domain_crash_synchronous , .Lft19,domain_crash_synchronous
- .long .Lft20,domain_crash_synchronous , .Lft21,domain_crash_synchronous
- .long .Lft22,domain_crash_synchronous , .Lft23,domain_crash_synchronous
- .long .Lft24,domain_crash_synchronous , .Lft25,domain_crash_synchronous
-.previous
+ _ASM_EXTABLE(.Lft6, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft7, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft8, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft9, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft10, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft11, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft12, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft13, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft14, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft15, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft16, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft17, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft18, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft19, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft20, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft21, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft22, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft23, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft24, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft25, domain_crash_synchronous)
domain_crash_synchronous_string:
.asciz "domain_crash_sync called from entry.S (%lx)\n"
--- 2010-12-23.orig/xen/arch/x86/x86_64/asm-offsets.c
+++ 2010-12-23/xen/arch/x86/x86_64/asm-offsets.c
@@ -3,6 +3,7 @@
* This code generates raw asm output which is post-processed
* to extract and format the required data.
*/
+#define COMPILE_OFFSETS
#include <xen/config.h>
#include <xen/perfc.h>
--- 2010-12-23.orig/xen/arch/x86/x86_64/compat/entry.S
+++ 2010-12-23/xen/arch/x86/x86_64/compat/entry.S
@@ -197,12 +197,8 @@ compat_failsafe_callback:
1: call compat_create_bounce_frame
jmp compat_test_all_events
.previous
-.section __pre_ex_table,"a"
- .quad .Lft0,.Lfx0
-.previous
-.section __ex_table,"a"
- .quad .Ldf0,compat_failsafe_callback
-.previous
+ _ASM_PRE_EXTABLE(.Lft0, .Lfx0)
+ _ASM_EXTABLE(.Ldf0, compat_failsafe_callback)
/* %rdx: trap_bounce, %rbx: struct vcpu */
ENTRY(compat_post_handle_exception)
@@ -330,15 +326,19 @@ UNLIKELY_END(compat_bounce_failsafe)
xorl %edi,%edi
jmp .Lft13
.previous
-.section __ex_table,"a"
- .quad .Lft1,domain_crash_synchronous , .Lft2,compat_crash_page_fault
- .quad .Lft3,compat_crash_page_fault_4 ,
.Lft4,domain_crash_synchronous
- .quad .Lft5,compat_crash_page_fault_4 ,
.Lft6,compat_crash_page_fault_8
- .quad .Lft7,compat_crash_page_fault , .Lft8,compat_crash_page_fault
- .quad .Lft9,compat_crash_page_fault_12,
.Lft10,compat_crash_page_fault_8
- .quad .Lft11,compat_crash_page_fault_4 , .Lft12,compat_crash_page_fault
- .quad .Lft13,.Lfx13
-.previous
+ _ASM_EXTABLE(.Lft1, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft2, compat_crash_page_fault)
+ _ASM_EXTABLE(.Lft3, compat_crash_page_fault_4)
+ _ASM_EXTABLE(.Lft4, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft5, compat_crash_page_fault_4)
+ _ASM_EXTABLE(.Lft6, compat_crash_page_fault_8)
+ _ASM_EXTABLE(.Lft7, compat_crash_page_fault)
+ _ASM_EXTABLE(.Lft8, compat_crash_page_fault)
+ _ASM_EXTABLE(.Lft9, compat_crash_page_fault_12)
+ _ASM_EXTABLE(.Lft10, compat_crash_page_fault_8)
+ _ASM_EXTABLE(.Lft11, compat_crash_page_fault_4)
+ _ASM_EXTABLE(.Lft12, compat_crash_page_fault)
+ _ASM_EXTABLE(.Lft13, .Lfx13)
compat_crash_page_fault_12:
addl $4,%esi
@@ -356,9 +356,7 @@ compat_crash_page_fault:
xorl %edi,%edi
jmp .Lft14
.previous
-.section __ex_table,"a"
- .quad .Lft14,.Lfx14
-.previous
+ _ASM_EXTABLE(.Lft14, .Lfx14)
.section .rodata, "a", @progbits
--- 2010-12-23.orig/xen/arch/x86/x86_64/entry.S
+++ 2010-12-23/xen/arch/x86/x86_64/entry.S
@@ -84,12 +84,8 @@ failsafe_callback:
1: call create_bounce_frame
jmp test_all_events
.previous
-.section __pre_ex_table,"a"
- .quad .Lft0,.Lfx0
-.previous
-.section __ex_table,"a"
- .quad .Ldf0,failsafe_callback
-.previous
+ _ASM_PRE_EXTABLE(.Lft0, .Lfx0)
+ _ASM_EXTABLE(.Ldf0, failsafe_callback)
ALIGN
/* No special register assumptions. */
@@ -412,14 +408,18 @@ UNLIKELY_END(bounce_failsafe)
jz domain_crash_synchronous
movq %rax,UREGS_rip+8(%rsp)
ret
-.section __ex_table,"a"
- .quad .Lft2,domain_crash_synchronous , .Lft3,domain_crash_synchronous
- .quad .Lft4,domain_crash_synchronous , .Lft5,domain_crash_synchronous
- .quad .Lft6,domain_crash_synchronous , .Lft7,domain_crash_synchronous
- .quad .Lft8,domain_crash_synchronous , .Lft9,domain_crash_synchronous
- .quad .Lft10,domain_crash_synchronous , .Lft11,domain_crash_synchronous
- .quad .Lft12,domain_crash_synchronous , .Lft13,domain_crash_synchronous
-.previous
+ _ASM_EXTABLE(.Lft2, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft3, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft4, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft5, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft6, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft7, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft8, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft9, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft10, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft11, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft12, domain_crash_synchronous)
+ _ASM_EXTABLE(.Lft13, domain_crash_synchronous)
domain_crash_synchronous_string:
.asciz "domain_crash_sync called from entry.S\n"
--- 2010-12-23.orig/xen/arch/x86/x86_64/mm.c
+++ 2010-12-23/xen/arch/x86/x86_64/mm.c
@@ -1119,10 +1119,7 @@ long do_set_segment_base(unsigned int wh
"2: xorl %k0,%k0 \n"
" jmp 1b \n"
".previous \n"
- ".section __ex_table,\"a\"\n"
- " .align 8 \n"
- " .quad 1b,2b \n"
- ".previous "
+ _ASM_EXTABLE(1b, 2b)
: : "r" (base&0xffff) );
break;
--- 2010-12-23.orig/xen/arch/x86/xen.lds.S
+++ 2010-12-23/xen/arch/x86/xen.lds.S
@@ -38,18 +38,19 @@ SECTIONS
*(.rodata.*)
} :text
- . = ALIGN(32); /* Exception table */
- __ex_table : {
+ . = ALIGN(SMP_CACHE_BYTES);
+ .data.read_mostly : {
+ /* Exception table */
__start___ex_table = .;
- *(__ex_table)
+ *(.ex_table)
__stop___ex_table = .;
- } :text
- . = ALIGN(32); /* Pre-exception table */
- __pre_ex_table : {
+ /* Pre-exception table */
__start___pre_ex_table = .;
- *(__pre_ex_table)
+ *(.ex_table.pre)
__stop___pre_ex_table = .;
+
+ *(.data.read_mostly)
} :text
.data : { /* Data */
@@ -59,11 +60,6 @@ SECTIONS
CONSTRUCTORS
} :text
- . = ALIGN(SMP_CACHE_BYTES);
- .data.read_mostly : {
- *(.data.read_mostly)
- } :text
-
#ifdef LOCK_PROFILE
. = ALIGN(32);
__lock_profile_start = .;
--- 2010-12-23.orig/xen/include/asm-x86/asm_defns.h
+++ 2010-12-23/xen/include/asm-x86/asm_defns.h
@@ -2,8 +2,10 @@
#ifndef __X86_ASM_DEFNS_H__
#define __X86_ASM_DEFNS_H__
+#ifndef COMPILE_OFFSETS
/* NB. Auto-generated from arch/.../asm-offsets.c */
#include <asm/asm-offsets.h>
+#endif
#include <asm/processor.h>
#ifdef __x86_64__
@@ -12,6 +14,24 @@
#include <asm/x86_32/asm_defns.h>
#endif
+/* Exception table entry */
+#ifdef __ASSEMBLY__
+# define _ASM__EXTABLE(sfx, from, to) \
+ .section .ex_table##sfx, "a" ; \
+ .balign 4 ; \
+ .long _ASM_EX(from), _ASM_EX(to) ; \
+ .previous
+#else
+# define _ASM__EXTABLE(sfx, from, to) \
+ " .section .ex_table" #sfx ",\"a\"\n"
\
+ " .balign 4\n" \
+ " .long " _ASM_EX(from) ", " _ASM_EX(to) "\n"
\
+ " .previous\n"
+#endif
+
+#define _ASM_EXTABLE(from, to) _ASM__EXTABLE(, from, to)
+#define _ASM_PRE_EXTABLE(from, to) _ASM__EXTABLE(.pre, from, to)
+
#ifdef __ASSEMBLY__
#define UNLIKELY_START(cond, tag) \
--- 2010-12-23.orig/xen/include/asm-x86/config.h
+++ 2010-12-23/xen/include/asm-x86/config.h
@@ -274,8 +274,6 @@ extern unsigned int video_mode, video_fl
/* For generic assembly code: use macros to define operation/operand sizes. */
#define __OS "q" /* Operation Suffix */
#define __OP "r" /* Operand Prefix */
-#define __FIXUP_ALIGN ".align 8"
-#define __FIXUP_WORD ".quad"
#elif defined(__i386__)
@@ -351,8 +349,6 @@ extern unsigned int video_mode, video_fl
/* For generic assembly code: use macros to define operation/operand sizes. */
#define __OS "l" /* Operation Suffix */
#define __OP "e" /* Operand Prefix */
-#define __FIXUP_ALIGN ".align 4"
-#define __FIXUP_WORD ".long"
#endif /* __i386__ */
--- 2010-12-23.orig/xen/include/asm-x86/hvm/vmx/vmx.h
+++ 2010-12-23/xen/include/asm-x86/hvm/vmx/vmx.h
@@ -22,6 +22,7 @@
#include <xen/sched.h>
#include <asm/types.h>
#include <asm/regs.h>
+#include <asm/asm_defns.h>
#include <asm/processor.h>
#include <asm/i387.h>
#include <asm/hvm/support.h>
@@ -341,10 +342,7 @@ static inline void __invvpid(int type, u
asm volatile ( "1: " INVVPID_OPCODE MODRM_EAX_08
/* CF==1 or ZF==1 --> crash (ud2) */
"ja 2f ; ud2 ; 2:\n"
- ".section __ex_table,\"a\"\n"
- " "__FIXUP_ALIGN"\n"
- " "__FIXUP_WORD" 1b,2b\n"
- ".previous"
+ _ASM_EXTABLE(1b, 2b)
:
: "a" (&operand), "c" (type)
: "memory" );
@@ -404,10 +402,7 @@ static inline int __vmxon(u64 addr)
".section .fixup,\"ax\"\n"
"3: sub $2,%0 ; jmp 2b\n" /* #UD or #GP --> rc = -2 */
".previous\n"
- ".section __ex_table,\"a\"\n"
- " "__FIXUP_ALIGN"\n"
- " "__FIXUP_WORD" 1b,3b\n"
- ".previous\n"
+ _ASM_EXTABLE(1b, 3b)
: "=q" (rc)
: "0" (0), "a" (&addr)
: "memory");
--- 2010-12-23.orig/xen/include/asm-x86/msr.h
+++ 2010-12-23/xen/include/asm-x86/msr.h
@@ -8,6 +8,7 @@
#include <xen/types.h>
#include <xen/percpu.h>
#include <xen/errno.h>
+#include <asm/asm_defns.h>
#define rdmsr(msr,val1,val2) \
__asm__ __volatile__("rdmsr" \
@@ -44,10 +45,7 @@ static inline void wrmsrl(unsigned int m
"3: xorl %0,%0\n; xorl %1,%1\n" \
" movl %5,%2\n; jmp 2b\n" \
".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " "__FIXUP_ALIGN"\n" \
- " "__FIXUP_WORD" 1b,3b\n" \
- ".previous\n" \
+ _ASM_EXTABLE(1b, 3b) \
: "=a" (lo), "=d" (hi), "=&r" (_rc) \
: "c" (msr), "2" (0), "i" (-EFAULT)); \
val = lo | ((uint64_t)hi << 32); \
@@ -66,10 +64,7 @@ static inline int wrmsr_safe(unsigned in
".section .fixup,\"ax\"\n"
"3: movl %5,%0\n; jmp 2b\n"
".previous\n"
- ".section __ex_table,\"a\"\n"
- " "__FIXUP_ALIGN"\n"
- " "__FIXUP_WORD" 1b,3b\n"
- ".previous\n"
+ _ASM_EXTABLE(1b, 3b)
: "=&r" (_rc)
: "c" (msr), "a" (lo), "d" (hi),
"0" (0), "i" (-EFAULT));
return _rc;
--- 2010-12-23.orig/xen/include/asm-x86/uaccess.h
+++ 2010-12-23/xen/include/asm-x86/uaccess.h
@@ -6,6 +6,7 @@
#include <xen/compiler.h>
#include <xen/errno.h>
#include <xen/prefetch.h>
+#include <asm/asm_defns.h>
#include <asm/page.h>
#ifdef __x86_64__
@@ -155,10 +156,7 @@ struct __large_struct { unsigned long bu
"3: mov %3,%0\n" \
" jmp 2b\n" \
".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " "__FIXUP_ALIGN"\n" \
- " "__FIXUP_WORD" 1b,3b\n" \
- ".previous" \
+ _ASM_EXTABLE(1b, 3b) \
: "=r"(err) \
: ltype (x), "m"(__m(addr)), "i"(errret),
"0"(err))
@@ -171,10 +169,7 @@ struct __large_struct { unsigned long bu
" xor"itype" %"rtype"1,%"rtype"1\n"
\
" jmp 2b\n" \
".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " "__FIXUP_ALIGN"\n" \
- " "__FIXUP_WORD" 1b,3b\n" \
- ".previous" \
+ _ASM_EXTABLE(1b, 3b) \
: "=r"(err), ltype (x) \
: "m"(__m(addr)), "i"(errret), "0"(err))
@@ -272,7 +267,7 @@ __copy_from_user(void *to, const void __
struct exception_table_entry
{
- unsigned long insn, fixup;
+ s32 addr, cont;
};
extern unsigned long search_exception_table(unsigned long);
--- 2010-12-23.orig/xen/include/asm-x86/x86_32/asm_defns.h
+++ 2010-12-23/xen/include/asm-x86/x86_32/asm_defns.h
@@ -153,4 +153,10 @@ STR(IRQ) #nr "_interrupt:\n\t"
GET_CPUINFO_FIELD(CPUINFO_current_vcpu,reg) \
movl (reg),reg;
+#ifdef __ASSEMBLY__
+# define _ASM_EX(p) p
+#else
+# define _ASM_EX(p) #p
+#endif
+
#endif /* __X86_32_ASM_DEFNS_H__ */
--- 2010-12-23.orig/xen/include/asm-x86/x86_32/system.h
+++ 2010-12-23/xen/include/asm-x86/x86_32/system.h
@@ -49,10 +49,7 @@ static always_inline unsigned long long
"3: movl $1,%1\n"
\
" jmp 2b\n"
\
".previous\n"
\
- ".section __ex_table,\"a\"\n"
\
- " .align 4\n"
\
- " .long 1b,3b\n"
\
- ".previous"
\
+ _ASM_EXTABLE(1b, 3b) \
: "=a" (_o), "=r" (_rc)
\
: _regtype (_n), "m" (*__xg((volatile void *)_p)),
"0" (_o), "1" (0) \
: "memory");
@@ -78,10 +75,7 @@ static always_inline unsigned long long
"3: movl $1,%1\n"
\
" jmp 2b\n"
\
".previous\n"
\
- ".section __ex_table,\"a\"\n"
\
- " .align 4\n"
\
- " .long 1b,3b\n"
\
- ".previous"
\
+ _ASM_EXTABLE(1b, 3b) \
: "=A" (_o), "=r" (_rc)
\
: "c" ((u32)((u64)(_n)>>32)), "b"
((u32)(_n)), \
"m" (*__xg((volatile void *)(_p))), "0" (_o),
"1" (0) \
--- 2010-12-23.orig/xen/include/asm-x86/x86_32/uaccess.h
+++ 2010-12-23/xen/include/asm-x86/x86_32/uaccess.h
@@ -33,11 +33,8 @@ extern void __uaccess_var_not_u64(void);
"4: movl %3,%0\n" \
" jmp 3b\n" \
".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 1b,4b\n" \
- " .long 2b,4b\n" \
- ".previous" \
+ _ASM_EXTABLE(1b, 4b) \
+ _ASM_EXTABLE(2b, 4b) \
: "=r"(retval) \
: "A" (x), "r" (addr), "i"(errret),
"0"(retval))
@@ -65,11 +62,8 @@ do { \
" xorl %%edx,%%edx\n" \
" jmp 3b\n" \
".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 1b,4b\n" \
- " .long 2b,4b\n" \
- ".previous" \
+ _ASM_EXTABLE(1b, 4b) \
+ _ASM_EXTABLE(2b, 4b) \
: "=r" (retval), "=&A" (x) \
: "r" (addr), "i"(errret), "0"(retval))
--- 2010-12-23.orig/xen/include/asm-x86/x86_64/asm_defns.h
+++ 2010-12-23/xen/include/asm-x86/x86_64/asm_defns.h
@@ -130,4 +130,10 @@ STR(IRQ) #nr "_interrupt:\n\t"
GET_CPUINFO_FIELD(CPUINFO_current_vcpu,reg) \
movq (reg),reg;
+#ifdef __ASSEMBLY__
+# define _ASM_EX(p) p-.
+#else
+# define _ASM_EX(p) #p "-."
+#endif
+
#endif /* __X86_64_ASM_DEFNS_H__ */
--- 2010-12-23.orig/xen/include/asm-x86/x86_64/system.h
+++ 2010-12-23/xen/include/asm-x86/x86_64/system.h
@@ -19,10 +19,7 @@
"3: movl $1,%1\n"
\
" jmp 2b\n"
\
".previous\n"
\
- ".section __ex_table,\"a\"\n"
\
- " .align 8\n"
\
- " .quad 1b,3b\n"
\
- ".previous"
\
+ _ASM_EXTABLE(1b, 3b) \
: "=a" (_o), "=r" (_rc)
\
: _regtype (_n), "m" (*__xg((volatile void *)_p)),
"0" (_o), "1" (0) \
: "memory");
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel