The ALTERNATIVE() and ALTERNATIVE_2() macros are GNU assembler macros, which makes them quite inflexible for future changes. Convert them to preprocessor macros. Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> --- arch/x86/entry/entry_32.S | 12 +++--- arch/x86/entry/entry_64.S | 10 ++--- arch/x86/entry/entry_64_compat.S | 8 ++-- arch/x86/entry/vdso/vdso32/system_call.S | 10 ++--- arch/x86/include/asm/alternative-asm.h | 68 +++++++++++++++----------------- arch/x86/include/asm/smap.h | 4 +- arch/x86/lib/copy_page_64.S | 2 +- arch/x86/lib/memcpy_64.S | 4 +- arch/x86/lib/memmove_64.S | 3 +- arch/x86/lib/memset_64.S | 4 +- 10 files changed, 59 insertions(+), 66 deletions(-) diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S index 21d1197779a4..338dc838a9a8 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -443,8 +443,8 @@ ENTRY(entry_SYSENTER_32) movl %esp, %eax call do_fast_syscall_32 /* XEN PV guests always use IRET path */ - ALTERNATIVE "testl %eax, %eax; jz .Lsyscall_32_done", \ - "jmp .Lsyscall_32_done", X86_FEATURE_XENPV + #define JMP_IF_IRET testl %eax, %eax; jz .Lsyscall_32_done + ALTERNATIVE(JMP_IF_IRET, jmp .Lsyscall_32_done, X86_FEATURE_XENPV) /* Opportunistic SYSEXIT */ TRACE_IRQS_ON /* User mode traces as IRQs on. */ @@ -536,7 +536,7 @@ restore_all: TRACE_IRQS_IRET .Lrestore_all_notrace: #ifdef CONFIG_X86_ESPFIX32 - ALTERNATIVE "jmp .Lrestore_nocheck", "", X86_BUG_ESPFIX + ALTERNATIVE(jmp .Lrestore_nocheck, , X86_BUG_ESPFIX) movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS /* @@ -692,9 +692,9 @@ ENTRY(simd_coprocessor_error) pushl $0 #ifdef CONFIG_X86_INVD_BUG /* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */ - ALTERNATIVE "pushl $do_general_protection", \ - "pushl $do_simd_coprocessor_error", \ - X86_FEATURE_XMM + ALTERNATIVE(pushl $do_general_protection, + pushl $do_simd_coprocessor_error, + X86_FEATURE_XMM) #else pushl $do_simd_coprocessor_error #endif diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index c7c85724d7e0..49733c72619a 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -925,7 +925,7 @@ ENTRY(native_load_gs_index) SWAPGS .Lgs_change: movl %edi, %gs -2: ALTERNATIVE "", "mfence", X86_BUG_SWAPGS_FENCE +2: ALTERNATIVE(, mfence, X86_BUG_SWAPGS_FENCE) SWAPGS popfq FRAME_END @@ -938,12 +938,8 @@ EXPORT_SYMBOL(native_load_gs_index) /* running with kernelgs */ bad_gs: SWAPGS /* switch back to user gs */ -.macro ZAP_GS - /* This can't be a string because the preprocessor needs to see it. */ - movl $__USER_DS, %eax - movl %eax, %gs -.endm - ALTERNATIVE "", "ZAP_GS", X86_BUG_NULL_SEG + #define ZAP_GS movl $__USER_DS, %eax; movl %eax, %gs + ALTERNATIVE(, ZAP_GS, X86_BUG_NULL_SEG) xorl %eax, %eax movl %eax, %gs jmp 2b diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S index 4d9385529c39..16e82b5103b5 100644 --- a/arch/x86/entry/entry_64_compat.S +++ b/arch/x86/entry/entry_64_compat.S @@ -124,8 +124,8 @@ ENTRY(entry_SYSENTER_compat) movq %rsp, %rdi call do_fast_syscall_32 /* XEN PV guests always use IRET path */ - ALTERNATIVE "testl %eax, %eax; jz .Lsyscall_32_done", \ - "jmp .Lsyscall_32_done", X86_FEATURE_XENPV + #define JMP_IF_IRET testl %eax, %eax; jz .Lsyscall_32_done + ALTERNATIVE(JMP_IF_IRET, jmp .Lsyscall_32_done, X86_FEATURE_XENPV) jmp sysret32_from_system_call .Lsysenter_fix_flags: @@ -224,8 +224,8 @@ GLOBAL(entry_SYSCALL_compat_after_hwframe) movq %rsp, %rdi call do_fast_syscall_32 /* XEN PV guests always use IRET path */ - ALTERNATIVE "testl %eax, %eax; jz .Lsyscall_32_done", \ - "jmp .Lsyscall_32_done", X86_FEATURE_XENPV + ALTERNATIVE(JMP_IF_IRET, + jmp .Lsyscall_32_done, X86_FEATURE_XENPV) /* Opportunistic SYSRET */ sysret32_from_system_call: diff --git a/arch/x86/entry/vdso/vdso32/system_call.S b/arch/x86/entry/vdso/vdso32/system_call.S index ed4bc9731cbb..a0c5f9e8226c 100644 --- a/arch/x86/entry/vdso/vdso32/system_call.S +++ b/arch/x86/entry/vdso/vdso32/system_call.S @@ -48,15 +48,15 @@ __kernel_vsyscall: CFI_ADJUST_CFA_OFFSET 4 CFI_REL_OFFSET ebp, 0 - #define SYSENTER_SEQUENCE "movl %esp, %ebp; sysenter" - #define SYSCALL_SEQUENCE "movl %ecx, %ebp; syscall" + #define SYSENTER_SEQUENCE movl %esp, %ebp; sysenter + #define SYSCALL_SEQUENCE movl %ecx, %ebp; syscall #ifdef CONFIG_X86_64 /* If SYSENTER (Intel) or SYSCALL32 (AMD) is available, use it. */ - ALTERNATIVE_2 "", SYSENTER_SEQUENCE, X86_FEATURE_SYSENTER32, \ - SYSCALL_SEQUENCE, X86_FEATURE_SYSCALL32 + ALTERNATIVE_2(, SYSENTER_SEQUENCE, X86_FEATURE_SYSENTER32, + SYSCALL_SEQUENCE, X86_FEATURE_SYSCALL32) #else - ALTERNATIVE "", SYSENTER_SEQUENCE, X86_FEATURE_SEP + ALTERNATIVE(, SYSENTER_SEQUENCE, X86_FEATURE_SEP) #endif /* Enter using int $0x80 */ diff --git a/arch/x86/include/asm/alternative-asm.h b/arch/x86/include/asm/alternative-asm.h index e7636bac7372..60073947350d 100644 --- a/arch/x86/include/asm/alternative-asm.h +++ b/arch/x86/include/asm/alternative-asm.h @@ -39,23 +39,21 @@ * @newinstr. ".skip" directive takes care of proper instruction padding * in case @newinstr is longer than @oldinstr. */ -.macro ALTERNATIVE oldinstr, newinstr, feature -140: - \oldinstr -141: - .skip -(((144f-143f)-(141b-140b)) > 0) * ((144f-143f)-(141b-140b)),0x90 -142: - - .pushsection .altinstructions,"a" - altinstruction_entry 140b,143f,\feature,142b-140b,144f-143f,142b-141b - .popsection - - .pushsection .altinstr_replacement,"ax" -143: - \newinstr -144: +#define ALTERNATIVE(oldinstr, newinstr, feature) \ +140:; \ + oldinstr; \ +141:; \ + .skip -(((144f-143f)-(141b-140b)) > 0) * \ + ((144f-143f)-(141b-140b)),0x90; \ +142:; \ + .pushsection .altinstructions, "a"; \ + altinstruction_entry 140b,143f,feature,142b-140b,144f-143f,142b-141b;\ + .popsection; \ + .pushsection .altinstr_replacement, "ax"; \ +143:; \ + newinstr; \ +144:; \ .popsection -.endm #define old_len 141b-140b #define new_len1 144f-143f @@ -73,27 +71,25 @@ * has @feature1, it replaces @oldinstr with @newinstr1. If CPU has * @feature2, it replaces @oldinstr with @feature2. */ -.macro ALTERNATIVE_2 oldinstr, newinstr1, feature1, newinstr2, feature2 -140: - \oldinstr -141: - .skip -((alt_max_short(new_len1, new_len2) - (old_len)) > 0) * \ - (alt_max_short(new_len1, new_len2) - (old_len)),0x90 -142: - - .pushsection .altinstructions,"a" - altinstruction_entry 140b,143f,\feature1,142b-140b,144f-143f,142b-141b - altinstruction_entry 140b,144f,\feature2,142b-140b,145f-144f,142b-141b - .popsection - - .pushsection .altinstr_replacement,"ax" -143: - \newinstr1 -144: - \newinstr2 -145: +#define ALTERNATIVE_2(oldinstr, newinstr1, feature1, \ + newinstr2, feature2) \ +140:; \ + oldinstr; \ +141:; \ + .skip -((alt_max_short(new_len1, new_len2) - (old_len)) > 0) * \ + (alt_max_short(new_len1, new_len2) - (old_len)),0x90; \ +142:; \ + .pushsection .altinstructions, "a"; \ + altinstruction_entry 140b,143f,feature1,142b-140b,144f-143f,142b-141b; \ + altinstruction_entry 140b,144f,feature2,142b-140b,145f-144f,142b-141b; \ + .popsection; \ + .pushsection .altinstr_replacement, "ax"; \ +143:; \ + newinstr1; \ +144:; \ + newinstr2; \ +145:; \ .popsection -.endm #endif /* __ASSEMBLY__ */ diff --git a/arch/x86/include/asm/smap.h b/arch/x86/include/asm/smap.h index db333300bd4b..b1264cff8906 100644 --- a/arch/x86/include/asm/smap.h +++ b/arch/x86/include/asm/smap.h @@ -28,10 +28,10 @@ #ifdef CONFIG_X86_SMAP #define ASM_CLAC \ - ALTERNATIVE "", __stringify(__ASM_CLAC), X86_FEATURE_SMAP + ALTERNATIVE(, __ASM_CLAC, X86_FEATURE_SMAP) #define ASM_STAC \ - ALTERNATIVE "", __stringify(__ASM_STAC), X86_FEATURE_SMAP + ALTERNATIVE(, __ASM_STAC, X86_FEATURE_SMAP) #else /* CONFIG_X86_SMAP */ diff --git a/arch/x86/lib/copy_page_64.S b/arch/x86/lib/copy_page_64.S index e8508156c99d..0611dee51760 100644 --- a/arch/x86/lib/copy_page_64.S +++ b/arch/x86/lib/copy_page_64.S @@ -13,7 +13,7 @@ */ ALIGN ENTRY(copy_page) - ALTERNATIVE "jmp copy_page_regs", "", X86_FEATURE_REP_GOOD + ALTERNATIVE(jmp copy_page_regs, , X86_FEATURE_REP_GOOD) movl $4096/8, %ecx rep movsq ret diff --git a/arch/x86/lib/memcpy_64.S b/arch/x86/lib/memcpy_64.S index 9a53a06e5a3e..7ada0513864b 100644 --- a/arch/x86/lib/memcpy_64.S +++ b/arch/x86/lib/memcpy_64.S @@ -28,8 +28,8 @@ */ ENTRY(__memcpy) ENTRY(memcpy) - ALTERNATIVE_2 "jmp memcpy_orig", "", X86_FEATURE_REP_GOOD, \ - "jmp memcpy_erms", X86_FEATURE_ERMS + ALTERNATIVE_2(jmp memcpy_orig, , X86_FEATURE_REP_GOOD, + jmp memcpy_erms, X86_FEATURE_ERMS) movq %rdi, %rax movq %rdx, %rcx diff --git a/arch/x86/lib/memmove_64.S b/arch/x86/lib/memmove_64.S index 15de86cd15b0..ca6c39effa2f 100644 --- a/arch/x86/lib/memmove_64.S +++ b/arch/x86/lib/memmove_64.S @@ -42,7 +42,8 @@ ENTRY(__memmove) jg 2f .Lmemmove_begin_forward: - ALTERNATIVE "", "movq %rdx, %rcx; rep movsb; retq", X86_FEATURE_ERMS + #define ERMS_MOVSB_RET movq %rdx, %rcx; rep movsb; retq + ALTERNATIVE(, ERMS_MOVSB_RET, X86_FEATURE_ERMS) /* * movsq instruction have many startup latency diff --git a/arch/x86/lib/memset_64.S b/arch/x86/lib/memset_64.S index 55b95db30a61..d86825a11724 100644 --- a/arch/x86/lib/memset_64.S +++ b/arch/x86/lib/memset_64.S @@ -26,8 +26,8 @@ ENTRY(__memset) * * Otherwise, use original memset function. */ - ALTERNATIVE_2 "jmp memset_orig", "", X86_FEATURE_REP_GOOD, \ - "jmp memset_erms", X86_FEATURE_ERMS + ALTERNATIVE_2(jmp memset_orig, , X86_FEATURE_REP_GOOD, + jmp memset_erms, X86_FEATURE_ERMS) movq %rdi,%r9 movq %rdx,%rcx -- 2.13.6 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
