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s390/exceptions: switch to relative exception table entries

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This is the s390 port of 70627654 "x86, extable: Switch to relative
exception table entries".
Reduces the size of our exception tables by 50% on 64 bit builds.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2012-09-05 13:26:11 +02:00
committed by Martin Schwidefsky
parent 24996edce5
commit eb608fb366
10 changed files with 132 additions and 33 deletions
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42
arch/s390/include/asm/processor.h
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@@ -11,6 +11,8 @@
#ifndef __ASM_S390_PROCESSOR_H
#define __ASM_S390_PROCESSOR_H
#ifndef __ASSEMBLY__
#include <linux/linkage.h>
#include <linux/irqflags.h>
#include <asm/cpu.h>
@@ -348,23 +350,6 @@ extern void (*s390_base_ext_handler_fn)(void);
#define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL
/*
* Helper macro for exception table entries
*/
#ifndef CONFIG_64BIT
#define EX_TABLE(_fault,_target) \
".section __ex_table,\"a\"\n" \
" .align 4\n" \
" .long " #_fault "," #_target "\n" \
".previous\n"
#else
#define EX_TABLE(_fault,_target) \
".section __ex_table,\"a\"\n" \
" .align 8\n" \
" .quad " #_fault "," #_target "\n" \
".previous\n"
#endif
extern int memcpy_real(void *, void *, size_t);
extern void memcpy_absolute(void *, void *, size_t);
@@ -375,4 +360,25 @@ extern void memcpy_absolute(void *, void *, size_t);
memcpy_absolute(&(dest), &__tmp, sizeof(__tmp)); \
}
#endif /* __ASM_S390_PROCESSOR_H */
/*
* Helper macro for exception table entries
*/
#define EX_TABLE(_fault, _target) \
".section __ex_table,\"a\"\n" \
".align 4\n" \
".long (" #_fault ") - .\n" \
".long (" #_target ") - .\n" \
".previous\n"
#else /* __ASSEMBLY__ */
#define EX_TABLE(_fault, _target) \
.section __ex_table,"a" ; \
.align 4 ; \
.long (_fault) - . ; \
.long (_target) - . ; \
.previous
#endif /* __ASSEMBLY__ */
#endif /* __ASM_S390_PROCESSOR_H */