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Editing: alternative.h
Close
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_S390_ALTERNATIVE_H #define _ASM_S390_ALTERNATIVE_H #ifndef __ASSEMBLY__ #include <linux/types.h> #include <linux/stddef.h> #include <linux/stringify.h> struct alt_instr { s32 instr_offset; /* original instruction */ s32 repl_offset; /* offset to replacement instruction */ u16 facility; /* facility bit set for replacement */ u8 instrlen; /* length of original instruction */ u8 replacementlen; /* length of new instruction */ } __packed; void apply_alternative_instructions(void); void apply_alternatives(struct alt_instr *start, struct alt_instr *end); /* * |661: |662: |6620 |663: * +-----------+---------------------+ * | oldinstr | oldinstr_padding | * | +----------+----------+ * | | | | * | | >6 bytes |6/4/2 nops| * | |6 bytes jg-----------> * +-----------+---------------------+ * ^^ static padding ^^ * * .altinstr_replacement section * +---------------------+-----------+ * |6641: |6651: * | alternative instr 1 | * +-----------+---------+- - - - - -+ * |6642: |6652: | * | alternative instr 2 | padding * +---------------------+- - - - - -+ * ^ runtime ^ * * .altinstructions section * +---------------------------------+ * | alt_instr entries for each | * | alternative instr | * +---------------------------------+ */ #define b_altinstr(num) "664"#num #define e_altinstr(num) "665"#num #define e_oldinstr_pad_end "663" #define oldinstr_len "662b-661b" #define oldinstr_total_len e_oldinstr_pad_end"b-661b" #define altinstr_len(num) e_altinstr(num)"b-"b_altinstr(num)"b" #define oldinstr_pad_len(num) \ "-(((" altinstr_len(num) ")-(" oldinstr_len ")) > 0) * " \ "((" altinstr_len(num) ")-(" oldinstr_len "))" #define INSTR_LEN_SANITY_CHECK(len) \ ".if " len " > 254\n" \ "\t.error \"cpu alternatives does not support instructions " \ "blocks > 254 bytes\"\n" \ ".endif\n" \ ".if (" len ") %% 2\n" \ "\t.error \"cpu alternatives instructions length is odd\"\n" \ ".endif\n" #define OLDINSTR_PADDING(oldinstr, num) \ ".if " oldinstr_pad_len(num) " > 6\n" \ "\tjg " e_oldinstr_pad_end "f\n" \ "6620:\n" \ "\t.fill (" oldinstr_pad_len(num) " - (6620b-662b)) / 2, 2, 0x0700\n" \ ".else\n" \ "\t.fill " oldinstr_pad_len(num) " / 6, 6, 0xc0040000\n" \ "\t.fill " oldinstr_pad_len(num) " %% 6 / 4, 4, 0x47000000\n" \ "\t.fill " oldinstr_pad_len(num) " %% 6 %% 4 / 2, 2, 0x0700\n" \ ".endif\n" #define OLDINSTR(oldinstr, num) \ "661:\n\t" oldinstr "\n662:\n" \ OLDINSTR_PADDING(oldinstr, num) \ e_oldinstr_pad_end ":\n" \ INSTR_LEN_SANITY_CHECK(oldinstr_len) #define OLDINSTR_2(oldinstr, num1, num2) \ "661:\n\t" oldinstr "\n662:\n" \ ".if " altinstr_len(num1) " < " altinstr_len(num2) "\n" \ OLDINSTR_PADDING(oldinstr, num2) \ ".else\n" \ OLDINSTR_PADDING(oldinstr, num1) \ ".endif\n" \ e_oldinstr_pad_end ":\n" \ INSTR_LEN_SANITY_CHECK(oldinstr_len) #define ALTINSTR_ENTRY(facility, num) \ "\t.long 661b - .\n" /* old instruction */ \ "\t.long " b_altinstr(num)"b - .\n" /* alt instruction */ \ "\t.word " __stringify(facility) "\n" /* facility bit */ \ "\t.byte " oldinstr_total_len "\n" /* source len */ \ "\t.byte " altinstr_len(num) "\n" /* alt instruction len */ #define ALTINSTR_REPLACEMENT(altinstr, num) /* replacement */ \ b_altinstr(num)":\n\t" altinstr "\n" e_altinstr(num) ":\n" \ INSTR_LEN_SANITY_CHECK(altinstr_len(num)) /* alternative assembly primitive: */ #define ALTERNATIVE(oldinstr, altinstr, facility) \ ".pushsection .altinstr_replacement, \"ax\"\n" \ ALTINSTR_REPLACEMENT(altinstr, 1) \ ".popsection\n" \ OLDINSTR(oldinstr, 1) \ ".pushsection .altinstructions,\"a\"\n" \ ALTINSTR_ENTRY(facility, 1) \ ".popsection\n" #define ALTERNATIVE_2(oldinstr, altinstr1, facility1, altinstr2, facility2)\ ".pushsection .altinstr_replacement, \"ax\"\n" \ ALTINSTR_REPLACEMENT(altinstr1, 1) \ ALTINSTR_REPLACEMENT(altinstr2, 2) \ ".popsection\n" \ OLDINSTR_2(oldinstr, 1, 2) \ ".pushsection .altinstructions,\"a\"\n" \ ALTINSTR_ENTRY(facility1, 1) \ ALTINSTR_ENTRY(facility2, 2) \ ".popsection\n" /* * Alternative instructions for different CPU types or capabilities. * * This allows to use optimized instructions even on generic binary * kernels. * * oldinstr is padded with jump and nops at compile time if altinstr is * longer. altinstr is padded with jump and nops at run-time during patching. * * For non barrier like inlines please define new variants * without volatile and memory clobber. */ #define alternative(oldinstr, altinstr, facility) \ asm volatile(ALTERNATIVE(oldinstr, altinstr, facility) : : : "memory") #define alternative_2(oldinstr, altinstr1, facility1, altinstr2, facility2) \ asm volatile(ALTERNATIVE_2(oldinstr, altinstr1, facility1, \ altinstr2, facility2) ::: "memory") #endif /* __ASSEMBLY__ */ #endif /* _ASM_S390_ALTERNATIVE_H */