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Merge remote-tracking branch 'origin/kvm-arm64/psci-relay' into kvmar…
…m-master/next Signed-off-by: Marc Zyngier <maz@kernel.org>
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| Original file line number | Diff line number | Diff line change |
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| /* SPDX-License-Identifier: GPL-2.0 */ | ||
| #ifndef __ASM_ALTERNATIVE_MACROS_H | ||
| #define __ASM_ALTERNATIVE_MACROS_H | ||
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| #include <asm/cpucaps.h> | ||
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| #define ARM64_CB_PATCH ARM64_NCAPS | ||
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| /* A64 instructions are always 32 bits. */ | ||
| #define AARCH64_INSN_SIZE 4 | ||
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| #ifndef __ASSEMBLY__ | ||
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| #include <linux/stringify.h> | ||
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| #define ALTINSTR_ENTRY(feature) \ | ||
| " .word 661b - .\n" /* label */ \ | ||
| " .word 663f - .\n" /* new instruction */ \ | ||
| " .hword " __stringify(feature) "\n" /* feature bit */ \ | ||
| " .byte 662b-661b\n" /* source len */ \ | ||
| " .byte 664f-663f\n" /* replacement len */ | ||
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| #define ALTINSTR_ENTRY_CB(feature, cb) \ | ||
| " .word 661b - .\n" /* label */ \ | ||
| " .word " __stringify(cb) "- .\n" /* callback */ \ | ||
| " .hword " __stringify(feature) "\n" /* feature bit */ \ | ||
| " .byte 662b-661b\n" /* source len */ \ | ||
| " .byte 664f-663f\n" /* replacement len */ | ||
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| /* | ||
| * alternative assembly primitive: | ||
| * | ||
| * If any of these .org directive fail, it means that insn1 and insn2 | ||
| * don't have the same length. This used to be written as | ||
| * | ||
| * .if ((664b-663b) != (662b-661b)) | ||
| * .error "Alternatives instruction length mismatch" | ||
| * .endif | ||
| * | ||
| * but most assemblers die if insn1 or insn2 have a .inst. This should | ||
| * be fixed in a binutils release posterior to 2.25.51.0.2 (anything | ||
| * containing commit 4e4d08cf7399b606 or c1baaddf8861). | ||
| * | ||
| * Alternatives with callbacks do not generate replacement instructions. | ||
| */ | ||
| #define __ALTERNATIVE_CFG(oldinstr, newinstr, feature, cfg_enabled) \ | ||
| ".if "__stringify(cfg_enabled)" == 1\n" \ | ||
| "661:\n\t" \ | ||
| oldinstr "\n" \ | ||
| "662:\n" \ | ||
| ".pushsection .altinstructions,\"a\"\n" \ | ||
| ALTINSTR_ENTRY(feature) \ | ||
| ".popsection\n" \ | ||
| ".subsection 1\n" \ | ||
| "663:\n\t" \ | ||
| newinstr "\n" \ | ||
| "664:\n\t" \ | ||
| ".org . - (664b-663b) + (662b-661b)\n\t" \ | ||
| ".org . - (662b-661b) + (664b-663b)\n\t" \ | ||
| ".previous\n" \ | ||
| ".endif\n" | ||
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| #define __ALTERNATIVE_CFG_CB(oldinstr, feature, cfg_enabled, cb) \ | ||
| ".if "__stringify(cfg_enabled)" == 1\n" \ | ||
| "661:\n\t" \ | ||
| oldinstr "\n" \ | ||
| "662:\n" \ | ||
| ".pushsection .altinstructions,\"a\"\n" \ | ||
| ALTINSTR_ENTRY_CB(feature, cb) \ | ||
| ".popsection\n" \ | ||
| "663:\n\t" \ | ||
| "664:\n\t" \ | ||
| ".endif\n" | ||
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| #define _ALTERNATIVE_CFG(oldinstr, newinstr, feature, cfg, ...) \ | ||
| __ALTERNATIVE_CFG(oldinstr, newinstr, feature, IS_ENABLED(cfg)) | ||
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| #define ALTERNATIVE_CB(oldinstr, cb) \ | ||
| __ALTERNATIVE_CFG_CB(oldinstr, ARM64_CB_PATCH, 1, cb) | ||
| #else | ||
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| #include <asm/assembler.h> | ||
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| .macro altinstruction_entry orig_offset alt_offset feature orig_len alt_len | ||
| .word \orig_offset - . | ||
| .word \alt_offset - . | ||
| .hword \feature | ||
| .byte \orig_len | ||
| .byte \alt_len | ||
| .endm | ||
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| .macro alternative_insn insn1, insn2, cap, enable = 1 | ||
| .if \enable | ||
| 661: \insn1 | ||
| 662: .pushsection .altinstructions, "a" | ||
| altinstruction_entry 661b, 663f, \cap, 662b-661b, 664f-663f | ||
| .popsection | ||
| .subsection 1 | ||
| 663: \insn2 | ||
| 664: .previous | ||
| .org . - (664b-663b) + (662b-661b) | ||
| .org . - (662b-661b) + (664b-663b) | ||
| .endif | ||
| .endm | ||
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| /* | ||
| * Alternative sequences | ||
| * | ||
| * The code for the case where the capability is not present will be | ||
| * assembled and linked as normal. There are no restrictions on this | ||
| * code. | ||
| * | ||
| * The code for the case where the capability is present will be | ||
| * assembled into a special section to be used for dynamic patching. | ||
| * Code for that case must: | ||
| * | ||
| * 1. Be exactly the same length (in bytes) as the default code | ||
| * sequence. | ||
| * | ||
| * 2. Not contain a branch target that is used outside of the | ||
| * alternative sequence it is defined in (branches into an | ||
| * alternative sequence are not fixed up). | ||
| */ | ||
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| /* | ||
| * Begin an alternative code sequence. | ||
| */ | ||
| .macro alternative_if_not cap | ||
| .set .Lasm_alt_mode, 0 | ||
| .pushsection .altinstructions, "a" | ||
| altinstruction_entry 661f, 663f, \cap, 662f-661f, 664f-663f | ||
| .popsection | ||
| 661: | ||
| .endm | ||
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| .macro alternative_if cap | ||
| .set .Lasm_alt_mode, 1 | ||
| .pushsection .altinstructions, "a" | ||
| altinstruction_entry 663f, 661f, \cap, 664f-663f, 662f-661f | ||
| .popsection | ||
| .subsection 1 | ||
| .align 2 /* So GAS knows label 661 is suitably aligned */ | ||
| 661: | ||
| .endm | ||
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| .macro alternative_cb cb | ||
| .set .Lasm_alt_mode, 0 | ||
| .pushsection .altinstructions, "a" | ||
| altinstruction_entry 661f, \cb, ARM64_CB_PATCH, 662f-661f, 0 | ||
| .popsection | ||
| 661: | ||
| .endm | ||
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| /* | ||
| * Provide the other half of the alternative code sequence. | ||
| */ | ||
| .macro alternative_else | ||
| 662: | ||
| .if .Lasm_alt_mode==0 | ||
| .subsection 1 | ||
| .else | ||
| .previous | ||
| .endif | ||
| 663: | ||
| .endm | ||
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| /* | ||
| * Complete an alternative code sequence. | ||
| */ | ||
| .macro alternative_endif | ||
| 664: | ||
| .if .Lasm_alt_mode==0 | ||
| .previous | ||
| .endif | ||
| .org . - (664b-663b) + (662b-661b) | ||
| .org . - (662b-661b) + (664b-663b) | ||
| .endm | ||
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| /* | ||
| * Callback-based alternative epilogue | ||
| */ | ||
| .macro alternative_cb_end | ||
| 662: | ||
| .endm | ||
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| /* | ||
| * Provides a trivial alternative or default sequence consisting solely | ||
| * of NOPs. The number of NOPs is chosen automatically to match the | ||
| * previous case. | ||
| */ | ||
| .macro alternative_else_nop_endif | ||
| alternative_else | ||
| nops (662b-661b) / AARCH64_INSN_SIZE | ||
| alternative_endif | ||
| .endm | ||
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| #define _ALTERNATIVE_CFG(insn1, insn2, cap, cfg, ...) \ | ||
| alternative_insn insn1, insn2, cap, IS_ENABLED(cfg) | ||
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| .macro user_alt, label, oldinstr, newinstr, cond | ||
| 9999: alternative_insn "\oldinstr", "\newinstr", \cond | ||
| _asm_extable 9999b, \label | ||
| .endm | ||
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| #endif /* __ASSEMBLY__ */ | ||
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| /* | ||
| * Usage: asm(ALTERNATIVE(oldinstr, newinstr, feature)); | ||
| * | ||
| * Usage: asm(ALTERNATIVE(oldinstr, newinstr, feature, CONFIG_FOO)); | ||
| * N.B. If CONFIG_FOO is specified, but not selected, the whole block | ||
| * will be omitted, including oldinstr. | ||
| */ | ||
| #define ALTERNATIVE(oldinstr, newinstr, ...) \ | ||
| _ALTERNATIVE_CFG(oldinstr, newinstr, __VA_ARGS__, 1) | ||
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| #endif /* __ASM_ALTERNATIVE_MACROS_H */ |
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