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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:02:30 +0000
commit76cb841cb886eef6b3bee341a2266c76578724ad (patch)
treef5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /arch/s390/include/asm/alternative-asm.h
parentInitial commit. (diff)
downloadlinux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz
linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip
Adding upstream version 4.19.249.upstream/4.19.249
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/s390/include/asm/alternative-asm.h')
-rw-r--r--arch/s390/include/asm/alternative-asm.h108
1 files changed, 108 insertions, 0 deletions
diff --git a/arch/s390/include/asm/alternative-asm.h b/arch/s390/include/asm/alternative-asm.h
new file mode 100644
index 000000000..955d620db
--- /dev/null
+++ b/arch/s390/include/asm/alternative-asm.h
@@ -0,0 +1,108 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_S390_ALTERNATIVE_ASM_H
+#define _ASM_S390_ALTERNATIVE_ASM_H
+
+#ifdef __ASSEMBLY__
+
+/*
+ * Check the length of an instruction sequence. The length may not be larger
+ * than 254 bytes and it has to be divisible by 2.
+ */
+.macro alt_len_check start,end
+ .if ( \end - \start ) > 254
+ .error "cpu alternatives does not support instructions blocks > 254 bytes\n"
+ .endif
+ .if ( \end - \start ) % 2
+ .error "cpu alternatives instructions length is odd\n"
+ .endif
+.endm
+
+/*
+ * Issue one struct alt_instr descriptor entry (need to put it into
+ * the section .altinstructions, see below). This entry contains
+ * enough information for the alternatives patching code to patch an
+ * instruction. See apply_alternatives().
+ */
+.macro alt_entry orig_start, orig_end, alt_start, alt_end, feature
+ .long \orig_start - .
+ .long \alt_start - .
+ .word \feature
+ .byte \orig_end - \orig_start
+ .byte \alt_end - \alt_start
+.endm
+
+/*
+ * Fill up @bytes with nops. The macro emits 6-byte nop instructions
+ * for the bulk of the area, possibly followed by a 4-byte and/or
+ * a 2-byte nop if the size of the area is not divisible by 6.
+ */
+.macro alt_pad_fill bytes
+ .fill ( \bytes ) / 6, 6, 0xc0040000
+ .fill ( \bytes ) % 6 / 4, 4, 0x47000000
+ .fill ( \bytes ) % 6 % 4 / 2, 2, 0x0700
+.endm
+
+/*
+ * Fill up @bytes with nops. If the number of bytes is larger
+ * than 6, emit a jg instruction to branch over all nops, then
+ * fill an area of size (@bytes - 6) with nop instructions.
+ */
+.macro alt_pad bytes
+ .if ( \bytes > 0 )
+ .if ( \bytes > 6 )
+ jg . + \bytes
+ alt_pad_fill \bytes - 6
+ .else
+ alt_pad_fill \bytes
+ .endif
+ .endif
+.endm
+
+/*
+ * Define an alternative between two instructions. If @feature is
+ * present, early code in apply_alternatives() replaces @oldinstr with
+ * @newinstr. ".skip" directive takes care of proper instruction padding
+ * in case @newinstr is longer than @oldinstr.
+ */
+.macro ALTERNATIVE oldinstr, newinstr, feature
+ .pushsection .altinstr_replacement,"ax"
+770: \newinstr
+771: .popsection
+772: \oldinstr
+773: alt_len_check 770b, 771b
+ alt_len_check 772b, 773b
+ alt_pad ( ( 771b - 770b ) - ( 773b - 772b ) )
+774: .pushsection .altinstructions,"a"
+ alt_entry 772b, 774b, 770b, 771b, \feature
+ .popsection
+.endm
+
+/*
+ * Define an alternative between two instructions. If @feature is
+ * present, early code in apply_alternatives() replaces @oldinstr with
+ * @newinstr. ".skip" directive takes care of proper instruction padding
+ * in case @newinstr is longer than @oldinstr.
+ */
+.macro ALTERNATIVE_2 oldinstr, newinstr1, feature1, newinstr2, feature2
+ .pushsection .altinstr_replacement,"ax"
+770: \newinstr1
+771: \newinstr2
+772: .popsection
+773: \oldinstr
+774: alt_len_check 770b, 771b
+ alt_len_check 771b, 772b
+ alt_len_check 773b, 774b
+ .if ( 771b - 770b > 772b - 771b )
+ alt_pad ( ( 771b - 770b ) - ( 774b - 773b ) )
+ .else
+ alt_pad ( ( 772b - 771b ) - ( 774b - 773b ) )
+ .endif
+775: .pushsection .altinstructions,"a"
+ alt_entry 773b, 775b, 770b, 771b,\feature1
+ alt_entry 773b, 775b, 771b, 772b,\feature2
+ .popsection
+.endm
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_S390_ALTERNATIVE_ASM_H */