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207ddb9189
__apply_alternatives() contains a runtime check which verifies that the size of the to be patched code area is even. Convert this to a compile time check using a similar ".org" trick, which is already used to verify that old and new code areas have the same size. Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_S390_ALTERNATIVE_ASM_H
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#define _ASM_S390_ALTERNATIVE_ASM_H
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#ifdef __ASSEMBLY__
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/*
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* Issue one struct alt_instr descriptor entry (need to put it into
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* the section .altinstructions, see below). This entry contains
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* enough information for the alternatives patching code to patch an
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* instruction. See apply_alternatives().
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*/
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.macro alt_entry orig_start, orig_end, alt_start, alt_end, feature
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.long \orig_start - .
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.long \alt_start - .
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.word \feature
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.byte \orig_end - \orig_start
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.org . - ( \orig_end - \orig_start ) & 1
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.org . - ( \orig_end - \orig_start ) + ( \alt_end - \alt_start )
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.org . - ( \alt_end - \alt_start ) + ( \orig_end - \orig_start )
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.endm
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/*
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* Define an alternative between two instructions. If @feature is
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* present, early code in apply_alternatives() replaces @oldinstr with
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* @newinstr.
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*/
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.macro ALTERNATIVE oldinstr, newinstr, feature
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.pushsection .altinstr_replacement,"ax"
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770: \newinstr
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771: .popsection
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772: \oldinstr
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773: .pushsection .altinstructions,"a"
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alt_entry 772b, 773b, 770b, 771b, \feature
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.popsection
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.endm
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/*
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* Define an alternative between two instructions. If @feature is
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* present, early code in apply_alternatives() replaces @oldinstr with
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* @newinstr.
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*/
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.macro ALTERNATIVE_2 oldinstr, newinstr1, feature1, newinstr2, feature2
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.pushsection .altinstr_replacement,"ax"
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770: \newinstr1
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771: \newinstr2
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772: .popsection
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773: \oldinstr
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774: .pushsection .altinstructions,"a"
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alt_entry 773b, 774b, 770b, 771b,\feature1
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alt_entry 773b, 774b, 771b, 772b,\feature2
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.popsection
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.endm
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_S390_ALTERNATIVE_ASM_H */
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