From: H. Peter Anvin Date: Thu, 10 Jun 2010 00:10:43 +0000 (+0000) Subject: x86, alternatives: Use 16-bit numbers for cpufeature index X-Git-Tag: v2.6.36-rc1~510^2~2 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=83a7a2ad2a9173dcabc05df0f01d1d85b7ba1c2c;p=thirdparty%2Flinux.git x86, alternatives: Use 16-bit numbers for cpufeature index We already have cpufeature indicies above 255, so use a 16-bit number for the alternatives index. This consumes a padding field and so doesn't add any size, but it means that abusing the padding field to create assembly errors on overflow no longer works. We can retain the test simply by redirecting it to the .discard section, however. [ v3: updated to include open-coded locations ] Signed-off-by: H. Peter Anvin LKML-Reference: Signed-off-by: H. Peter Anvin --- diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h index 03b6bb5394a02..bc6abb7bc7ee3 100644 --- a/arch/x86/include/asm/alternative.h +++ b/arch/x86/include/asm/alternative.h @@ -45,10 +45,9 @@ struct alt_instr { u8 *instr; /* original instruction */ u8 *replacement; - u8 cpuid; /* cpuid bit set for replacement */ + u16 cpuid; /* cpuid bit set for replacement */ u8 instrlen; /* length of original instruction */ u8 replacementlen; /* length of new instruction, <= instrlen */ - u8 pad1; #ifdef CONFIG_X86_64 u32 pad2; #endif @@ -86,9 +85,11 @@ static inline int alternatives_text_reserved(void *start, void *end) _ASM_ALIGN "\n" \ _ASM_PTR "661b\n" /* label */ \ _ASM_PTR "663f\n" /* new instruction */ \ - " .byte " __stringify(feature) "\n" /* feature bit */ \ + " .word " __stringify(feature) "\n" /* feature bit */ \ " .byte 662b-661b\n" /* sourcelen */ \ " .byte 664f-663f\n" /* replacementlen */ \ + ".previous\n" \ + ".section .discard,\"aw\",@progbits\n" \ " .byte 0xff + (664f-663f) - (662b-661b)\n" /* rlen <= slen */ \ ".previous\n" \ ".section .altinstr_replacement, \"ax\"\n" \ diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h index 4681459143899..e8b88967de35a 100644 --- a/arch/x86/include/asm/cpufeature.h +++ b/arch/x86/include/asm/cpufeature.h @@ -291,7 +291,7 @@ extern const char * const x86_power_flags[32]; * patch the target code for additional performance. * */ -static __always_inline __pure bool __static_cpu_has(u8 bit) +static __always_inline __pure bool __static_cpu_has(u16 bit) { #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5) asm goto("1: jmp %l[t_no]\n" @@ -300,11 +300,11 @@ static __always_inline __pure bool __static_cpu_has(u8 bit) _ASM_ALIGN "\n" _ASM_PTR "1b\n" _ASM_PTR "0\n" /* no replacement */ - " .byte %P0\n" /* feature bit */ + " .word %P0\n" /* feature bit */ " .byte 2b - 1b\n" /* source len */ " .byte 0\n" /* replacement len */ - " .byte 0xff + 0 - (2b-1b)\n" /* padding */ ".previous\n" + /* skipping size check since replacement size = 0 */ : : "i" (bit) : : t_no); return true; t_no: @@ -318,10 +318,12 @@ static __always_inline __pure bool __static_cpu_has(u8 bit) _ASM_ALIGN "\n" _ASM_PTR "1b\n" _ASM_PTR "3f\n" - " .byte %P1\n" /* feature bit */ + " .word %P1\n" /* feature bit */ " .byte 2b - 1b\n" /* source len */ " .byte 4f - 3f\n" /* replacement len */ - " .byte 0xff + (4f-3f) - (2b-1b)\n" /* padding */ + ".previous\n" + ".section .discard,\"aw\",@progbits\n" + " .byte 0xff + (4f-3f) - (2b-1b)\n" /* size check */ ".previous\n" ".section .altinstr_replacement,\"ax\"\n" "3: movb $1,%0\n" @@ -337,7 +339,7 @@ static __always_inline __pure bool __static_cpu_has(u8 bit) ( \ __builtin_constant_p(boot_cpu_has(bit)) ? \ boot_cpu_has(bit) : \ - (__builtin_constant_p(bit) && !((bit) & ~0xff)) ? \ + __builtin_constant_p(bit) ? \ __static_cpu_has(bit) : \ boot_cpu_has(bit) \ ) diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S index cd49141cf153f..7862cf510ea94 100644 --- a/arch/x86/kernel/entry_32.S +++ b/arch/x86/kernel/entry_32.S @@ -914,7 +914,7 @@ ENTRY(simd_coprocessor_error) .balign 4 .long 661b .long 663f - .byte X86_FEATURE_XMM + .word X86_FEATURE_XMM .byte 662b-661b .byte 664f-663f .previous diff --git a/arch/x86/lib/clear_page_64.S b/arch/x86/lib/clear_page_64.S index ebeafcce04a9b..aa4326bfb24a1 100644 --- a/arch/x86/lib/clear_page_64.S +++ b/arch/x86/lib/clear_page_64.S @@ -52,7 +52,7 @@ ENDPROC(clear_page) .align 8 .quad clear_page .quad 1b - .byte X86_FEATURE_REP_GOOD + .word X86_FEATURE_REP_GOOD .byte .Lclear_page_end - clear_page .byte 2b - 1b .previous diff --git a/arch/x86/lib/copy_page_64.S b/arch/x86/lib/copy_page_64.S index 727a5d46d2fc0..6fec2d1cebe11 100644 --- a/arch/x86/lib/copy_page_64.S +++ b/arch/x86/lib/copy_page_64.S @@ -113,7 +113,7 @@ ENDPROC(copy_page) .align 8 .quad copy_page .quad 1b - .byte X86_FEATURE_REP_GOOD + .word X86_FEATURE_REP_GOOD .byte .Lcopy_page_end - copy_page .byte 2b - 1b .previous diff --git a/arch/x86/lib/memcpy_64.S b/arch/x86/lib/memcpy_64.S index f82e884928af6..bcbcd1e0f7d57 100644 --- a/arch/x86/lib/memcpy_64.S +++ b/arch/x86/lib/memcpy_64.S @@ -131,7 +131,7 @@ ENDPROC(__memcpy) .align 8 .quad memcpy .quad .Lmemcpy_c - .byte X86_FEATURE_REP_GOOD + .word X86_FEATURE_REP_GOOD /* * Replace only beginning, memcpy is used to apply alternatives, diff --git a/arch/x86/lib/memset_64.S b/arch/x86/lib/memset_64.S index e88d3b81644a8..09d3442696522 100644 --- a/arch/x86/lib/memset_64.S +++ b/arch/x86/lib/memset_64.S @@ -121,7 +121,7 @@ ENDPROC(__memset) .align 8 .quad memset .quad .Lmemset_c - .byte X86_FEATURE_REP_GOOD + .word X86_FEATURE_REP_GOOD .byte .Lfinal - memset .byte .Lmemset_e - .Lmemset_c .previous