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x86/alternative: Replace the old macros
Now that the new macros have been gradually put in place, replace the old ones. Leave the new label numbers starting at 7xx as a hint that the new nested alternatives are being used now. Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20240607111701.8366-15-bp@kernel.org
This commit is contained in:
Borislav Petkov (AMD)
@@ -156,131 +156,51 @@ static inline int alternatives_text_reserved(void *start, void *end)
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#define ALT_CALL_INSTR "call BUG_func"
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#define b_replacement(num) "664"#num
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#define e_replacement(num) "665"#num
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#define alt_slen "772b-771b"
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#define alt_total_slen "773b-771b"
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#define alt_rlen "775f-774f"
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#define alt_end_marker "663"
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#define alt_slen "662b-661b"
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#define n_alt_slen "772b-771b"
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#define alt_total_slen alt_end_marker"b-661b"
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#define n_alt_total_slen "773b-771b"
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#define alt_rlen(num) e_replacement(num)"f-"b_replacement(num)"f"
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#define n_alt_rlen "775f-774f"
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#define OLDINSTR(oldinstr, num) \
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"# ALT: oldnstr\n" \
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"661:\n\t" oldinstr "\n662:\n" \
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"# ALT: padding\n" \
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".skip -(((" alt_rlen(num) ")-(" alt_slen ")) > 0) * " \
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"((" alt_rlen(num) ")-(" alt_slen ")),0x90\n" \
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alt_end_marker ":\n"
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#define N_OLDINSTR(oldinstr) \
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"# N_ALT: oldinstr\n" \
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#define OLDINSTR(oldinstr) \
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"# ALT: oldinstr\n" \
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"771:\n\t" oldinstr "\n772:\n" \
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"# N_ALT: padding\n" \
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".skip -(((" n_alt_rlen ")-(" n_alt_slen ")) > 0) * " \
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"((" n_alt_rlen ")-(" n_alt_slen ")),0x90\n" \
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"# ALT: padding\n" \
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".skip -(((" alt_rlen ")-(" alt_slen ")) > 0) * " \
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"((" alt_rlen ")-(" alt_slen ")),0x90\n" \
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"773:\n"
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/*
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* gas compatible max based on the idea from:
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* http://graphics.stanford.edu/~seander/bithacks.html#IntegerMinOrMax
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*
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* The additional "-" is needed because gas uses a "true" value of -1.
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*/
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#define alt_max_short(a, b) "((" a ") ^ (((" a ") ^ (" b ")) & -(-((" a ") < (" b ")))))"
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/*
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* Pad the second replacement alternative with additional NOPs if it is
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* additionally longer than the first replacement alternative.
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*/
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#define OLDINSTR_2(oldinstr, num1, num2) \
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"# ALT: oldinstr2\n" \
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"661:\n\t" oldinstr "\n662:\n" \
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"# ALT: padding2\n" \
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".skip -((" alt_max_short(alt_rlen(num1), alt_rlen(num2)) " - (" alt_slen ")) > 0) * " \
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"(" alt_max_short(alt_rlen(num1), alt_rlen(num2)) " - (" alt_slen ")), 0x90\n" \
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alt_end_marker ":\n"
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#define OLDINSTR_3(oldinsn, n1, n2, n3) \
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"# ALT: oldinstr3\n" \
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"661:\n\t" oldinsn "\n662:\n" \
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"# ALT: padding3\n" \
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".skip -((" alt_max_short(alt_max_short(alt_rlen(n1), alt_rlen(n2)), alt_rlen(n3)) \
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" - (" alt_slen ")) > 0) * " \
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"(" alt_max_short(alt_max_short(alt_rlen(n1), alt_rlen(n2)), alt_rlen(n3)) \
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" - (" alt_slen ")), 0x90\n" \
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alt_end_marker ":\n"
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#define ALTINSTR_ENTRY(ft_flags, num) \
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" .long 661b - .\n" /* label */ \
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" .long " b_replacement(num)"f - .\n" /* new instruction */ \
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" .4byte " __stringify(ft_flags) "\n" /* feature + flags */ \
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" .byte " alt_total_slen "\n" /* source len */ \
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" .byte " alt_rlen(num) "\n" /* replacement len */
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#define N_ALTINSTR_ENTRY(ft_flags) \
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#define ALTINSTR_ENTRY(ft_flags) \
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".pushsection .altinstructions,\"a\"\n" \
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" .long 771b - .\n" /* label */ \
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" .long 774f - .\n" /* new instruction */ \
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" .4byte " __stringify(ft_flags) "\n" /* feature + flags */ \
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" .byte " n_alt_total_slen "\n" /* source len */ \
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" .byte " n_alt_rlen "\n" /* replacement len */ \
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" .byte " alt_total_slen "\n" /* source len */ \
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" .byte " alt_rlen "\n" /* replacement len */ \
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".popsection\n"
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#define ALTINSTR_REPLACEMENT(newinstr, num) /* replacement */ \
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"# ALT: replacement " #num "\n" \
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b_replacement(num)":\n\t" newinstr "\n" e_replacement(num) ":\n"
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#define N_ALTINSTR_REPLACEMENT(newinstr) /* replacement */ \
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".pushsection .altinstr_replacement, \"ax\"\n" \
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"# N_ALT: replacement\n" \
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"774:\n\t" newinstr "\n775:\n" \
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#define ALTINSTR_REPLACEMENT(newinstr) /* replacement */ \
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".pushsection .altinstr_replacement, \"ax\"\n" \
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"# ALT: replacement\n" \
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"774:\n\t" newinstr "\n775:\n" \
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".popsection\n"
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/* alternative assembly primitive: */
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#define ALTERNATIVE(oldinstr, newinstr, ft_flags) \
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OLDINSTR(oldinstr, 1) \
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".pushsection .altinstructions,\"a\"\n" \
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ALTINSTR_ENTRY(ft_flags, 1) \
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".popsection\n" \
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".pushsection .altinstr_replacement, \"ax\"\n" \
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ALTINSTR_REPLACEMENT(newinstr, 1) \
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".popsection\n"
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/* Nested alternatives macro variant */
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#define N_ALTERNATIVE(oldinstr, newinstr, ft_flags) \
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N_OLDINSTR(oldinstr) \
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N_ALTINSTR_ENTRY(ft_flags) \
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N_ALTINSTR_REPLACEMENT(newinstr)
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OLDINSTR(oldinstr) \
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ALTINSTR_ENTRY(ft_flags) \
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ALTINSTR_REPLACEMENT(newinstr)
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#define ALTERNATIVE_2(oldinstr, newinstr1, ft_flags1, newinstr2, ft_flags2) \
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OLDINSTR_2(oldinstr, 1, 2) \
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".pushsection .altinstructions,\"a\"\n" \
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ALTINSTR_ENTRY(ft_flags1, 1) \
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ALTINSTR_ENTRY(ft_flags2, 2) \
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".popsection\n" \
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".pushsection .altinstr_replacement, \"ax\"\n" \
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ALTINSTR_REPLACEMENT(newinstr1, 1) \
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ALTINSTR_REPLACEMENT(newinstr2, 2) \
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".popsection\n"
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#define N_ALTERNATIVE_2(oldinst, newinst1, flag1, newinst2, flag2) \
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N_ALTERNATIVE(N_ALTERNATIVE(oldinst, newinst1, flag1), \
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newinst2, flag2)
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ALTERNATIVE(ALTERNATIVE(oldinstr, newinstr1, ft_flags1), newinstr2, ft_flags2)
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/* If @feature is set, patch in @newinstr_yes, otherwise @newinstr_no. */
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#define ALTERNATIVE_TERNARY(oldinstr, ft_flags, newinstr_yes, newinstr_no) \
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N_ALTERNATIVE_2(oldinstr, newinstr_no, X86_FEATURE_ALWAYS, \
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newinstr_yes, ft_flags)
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ALTERNATIVE_2(oldinstr, newinstr_no, X86_FEATURE_ALWAYS, newinstr_yes, ft_flags)
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#define ALTERNATIVE_3(oldinstr, newinstr1, ft_flags1, newinstr2, ft_flags2, \
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newinstr3, ft_flags3) \
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N_ALTERNATIVE(N_ALTERNATIVE_2(oldinstr, newinstr1, ft_flags1, newinstr2, ft_flags2), \
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ALTERNATIVE(ALTERNATIVE_2(oldinstr, newinstr1, ft_flags1, newinstr2, ft_flags2), \
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newinstr3, ft_flags3)
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/*
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* Alternative instructions for different CPU types or capabilities.
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*
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@@ -294,10 +214,10 @@ static inline int alternatives_text_reserved(void *start, void *end)
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* without volatile and memory clobber.
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*/
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#define alternative(oldinstr, newinstr, ft_flags) \
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asm_inline volatile(N_ALTERNATIVE(oldinstr, newinstr, ft_flags) : : : "memory")
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asm_inline volatile(ALTERNATIVE(oldinstr, newinstr, ft_flags) : : : "memory")
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#define alternative_2(oldinstr, newinstr1, ft_flags1, newinstr2, ft_flags2) \
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asm_inline volatile(N_ALTERNATIVE_2(oldinstr, newinstr1, ft_flags1, newinstr2, ft_flags2) ::: "memory")
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asm_inline volatile(ALTERNATIVE_2(oldinstr, newinstr1, ft_flags1, newinstr2, ft_flags2) ::: "memory")
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/*
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* Alternative inline assembly with input.
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@@ -308,12 +228,12 @@ static inline int alternatives_text_reserved(void *start, void *end)
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* Leaving an unused argument 0 to keep API compatibility.
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*/
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#define alternative_input(oldinstr, newinstr, ft_flags, input...) \
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asm_inline volatile(N_ALTERNATIVE(oldinstr, newinstr, ft_flags) \
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asm_inline volatile(ALTERNATIVE(oldinstr, newinstr, ft_flags) \
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: : "i" (0), ## input)
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/* Like alternative_input, but with a single output argument */
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#define alternative_io(oldinstr, newinstr, ft_flags, output, input...) \
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asm_inline volatile(N_ALTERNATIVE(oldinstr, newinstr, ft_flags) \
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asm_inline volatile(ALTERNATIVE(oldinstr, newinstr, ft_flags) \
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: output : "i" (0), ## input)
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/*
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@@ -327,7 +247,7 @@ static inline int alternatives_text_reserved(void *start, void *end)
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* suffix.
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*/
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#define alternative_call(oldfunc, newfunc, ft_flags, output, input...) \
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asm_inline volatile(N_ALTERNATIVE("call %c[old]", "call %c[new]", ft_flags) \
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asm_inline volatile(ALTERNATIVE("call %c[old]", "call %c[new]", ft_flags) \
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: output : [old] "i" (oldfunc), [new] "i" (newfunc), ## input)
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/*
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@@ -338,7 +258,7 @@ static inline int alternatives_text_reserved(void *start, void *end)
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*/
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#define alternative_call_2(oldfunc, newfunc1, ft_flags1, newfunc2, ft_flags2, \
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output, input...) \
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asm_inline volatile(N_ALTERNATIVE_2("call %c[old]", "call %c[new1]", ft_flags1, \
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asm_inline volatile(ALTERNATIVE_2("call %c[old]", "call %c[new1]", ft_flags1, \
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"call %c[new2]", ft_flags2) \
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: output, ASM_CALL_CONSTRAINT \
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: [old] "i" (oldfunc), [new1] "i" (newfunc1), \
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@@ -422,7 +342,7 @@ void nop_func(void);
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* @newinstr. ".skip" directive takes care of proper instruction padding
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* in case @newinstr is longer than @oldinstr.
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*/
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#define __N_ALTERNATIVE(oldinst, newinst, flag) \
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#define __ALTERNATIVE(oldinst, newinst, flag) \
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740: \
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oldinst ; \
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741: \
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@@ -438,7 +358,7 @@ void nop_func(void);
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.popsection ;
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.macro ALTERNATIVE oldinstr, newinstr, ft_flags
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__N_ALTERNATIVE(\oldinstr, \newinstr, \ft_flags)
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__ALTERNATIVE(\oldinstr, \newinstr, \ft_flags)
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.endm
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#define old_len 141b-140b
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@@ -446,27 +366,18 @@ void nop_func(void);
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#define new_len2 145f-144f
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#define new_len3 146f-145f
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/*
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* gas compatible max based on the idea from:
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* http://graphics.stanford.edu/~seander/bithacks.html#IntegerMinOrMax
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*
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* The additional "-" is needed because gas uses a "true" value of -1.
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*/
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#define alt_max_2(a, b) ((a) ^ (((a) ^ (b)) & -(-((a) < (b)))))
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#define alt_max_3(a, b, c) (alt_max_2(alt_max_2(a, b), c))
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/*
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* Same as ALTERNATIVE macro above but for two alternatives. If CPU
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* has @feature1, it replaces @oldinstr with @newinstr1. If CPU has
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* @feature2, it replaces @oldinstr with @feature2.
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*/
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.macro ALTERNATIVE_2 oldinstr, newinstr1, ft_flags1, newinstr2, ft_flags2
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__N_ALTERNATIVE(__N_ALTERNATIVE(\oldinstr, \newinstr1, \ft_flags1),
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__ALTERNATIVE(__ALTERNATIVE(\oldinstr, \newinstr1, \ft_flags1),
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\newinstr2, \ft_flags2)
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.endm
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.macro ALTERNATIVE_3 oldinstr, newinstr1, ft_flags1, newinstr2, ft_flags2, newinstr3, ft_flags3
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__N_ALTERNATIVE(N_ALTERNATIVE_2(\oldinstr, \newinstr1, \ft_flags1, \newinstr2, \ft_flags2),
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__ALTERNATIVE(ALTERNATIVE_2(\oldinstr, \newinstr1, \ft_flags1, \newinstr2, \ft_flags2),
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\newinstr3, \ft_flags3)
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.endm
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