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Message-Id: <4D5D62CE02000078000327E4@vpn.id2.novell.com> Date: Thu, 17 Feb 2011 17:02:54 +0000 From: "Jan Beulich" <JBeulich@...ell.com> To: <mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com> Cc: <tony.luck@...el.com>, <linux-kernel@...r.kernel.org> Subject: [PATCH 1/3] x86-64: use macros to generate exception table entries Convert all open coded uses in x86-64 and common x86 code to use the macros that are available, thus subsequently allowing to change the actual implementation without having to touch dozens of places. Signed-off-by: Jan Beulich <jbeulich@...ell.com> Cc: Tony Luck <tony.luck@...el.com> --- arch/x86/ia32/ia32entry.S | 9 +---- arch/x86/include/asm/kvm_host.h | 4 -- arch/x86/include/asm/xsave.h | 10 +----- arch/x86/kernel/entry_64.S | 14 ++------ arch/x86/kernel/test_rodata.c | 10 +----- arch/x86/lib/copy_user_64.S | 58 +++++++++++++++--------------------- arch/x86/lib/copy_user_nocache_64.S | 50 ++++++++++++++----------------- arch/x86/lib/csum-copy_64.S | 16 ++------- arch/x86/lib/getuser.S | 9 ++--- arch/x86/lib/putuser.S | 12 +++---- 10 files changed, 73 insertions(+), 119 deletions(-) --- 2.6.38-rc5-extable.orig/arch/x86/ia32/ia32entry.S +++ 2.6.38-rc5-extable/arch/x86/ia32/ia32entry.S @@ -4,6 +4,7 @@ * Copyright 2000-2002 Andi Kleen, SuSE Labs. */ +#include <asm/asm.h> #include <asm/dwarf2.h> #include <asm/calling.h> #include <asm/asm-offsets.h> @@ -151,9 +152,7 @@ ENTRY(ia32_sysenter_target) /* no need to do an access_ok check here because rbp has been 32bit zero extended */ 1: movl (%rbp),%ebp - .section __ex_table,"a" - .quad 1b,ia32_badarg - .previous + _ASM_EXTABLE(1b, ia32_badarg) GET_THREAD_INFO(%r10) orl $TS_COMPAT,TI_status(%r10) testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10) @@ -312,9 +311,7 @@ ENTRY(ia32_cstar_target) 32bit zero extended */ /* hardware stack frame is complete now */ 1: movl (%r8),%r9d - .section __ex_table,"a" - .quad 1b,ia32_badarg - .previous + _ASM_EXTABLE(1b, ia32_badarg) GET_THREAD_INFO(%r10) orl $TS_COMPAT,TI_status(%r10) testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10) --- 2.6.38-rc5-extable.orig/arch/x86/include/asm/kvm_host.h +++ 2.6.38-rc5-extable/arch/x86/include/asm/kvm_host.h @@ -814,9 +814,7 @@ extern bool kvm_rebooting; "jne 668b \n\t" \ __ASM_SIZE(push) " $666b \n\t" \ "call kvm_spurious_fault \n\t" \ - ".popsection \n\t" \ - ".pushsection __ex_table, \"a\" \n\t" \ - _ASM_PTR " 666b, 667b \n\t" \ + _ASM_EXTABLE(666b, 667b) "\t" \ ".popsection" #define KVM_ARCH_WANT_MMU_NOTIFIER --- 2.6.38-rc5-extable.orig/arch/x86/include/asm/xsave.h +++ 2.6.38-rc5-extable/arch/x86/include/asm/xsave.h @@ -80,10 +80,7 @@ static inline int xsave_user(struct xsav "3: movl $-1,%[err]\n" " jmp 2b\n" ".previous\n" - ".section __ex_table,\"a\"\n" - _ASM_ALIGN "\n" - _ASM_PTR "1b,3b\n" - ".previous" + _ASM_EXTABLE(1b,3b) : [err] "=r" (err) : "D" (buf), "a" (-1), "d" (-1), "0" (0) : "memory"); @@ -106,10 +103,7 @@ static inline int xrestore_user(struct x "3: movl $-1,%[err]\n" " jmp 2b\n" ".previous\n" - ".section __ex_table,\"a\"\n" - _ASM_ALIGN "\n" - _ASM_PTR "1b,3b\n" - ".previous" + _ASM_EXTABLE(1b,3b) : [err] "=r" (err) : "D" (xstate), "a" (lmask), "d" (hmask), "0" (0) : "memory"); /* memory required? */ --- 2.6.38-rc5-extable.orig/arch/x86/kernel/entry_64.S +++ 2.6.38-rc5-extable/arch/x86/kernel/entry_64.S @@ -43,6 +43,7 @@ #include <asm/errno.h> #include <asm/dwarf2.h> #include <asm/calling.h> +#include <asm/asm.h> #include <asm/asm-offsets.h> #include <asm/msr.h> #include <asm/unistd.h> @@ -861,17 +862,13 @@ restore_args: irq_return: INTERRUPT_RETURN - .section __ex_table, "a" - .quad irq_return, bad_iret - .previous + _ASM_EXTABLE(irq_return, bad_iret) #ifdef CONFIG_PARAVIRT ENTRY(native_iret) iretq - .section __ex_table,"a" - .quad native_iret, bad_iret - .previous + _ASM_EXTABLE(native_iret, bad_iret) #endif .section .fixup,"ax" @@ -1133,10 +1130,7 @@ gs_change: CFI_ENDPROC END(native_load_gs_index) - .section __ex_table,"a" - .align 8 - .quad gs_change,bad_gs - .previous + _ASM_EXTABLE(gs_change, bad_gs) .section .fixup,"ax" /* running with kernelgs */ bad_gs: --- 2.6.38-rc5-extable.orig/arch/x86/kernel/test_rodata.c +++ 2.6.38-rc5-extable/arch/x86/kernel/test_rodata.c @@ -10,6 +10,7 @@ * of the License. */ #include <linux/module.h> +#include <asm/asm.h> #include <asm/cacheflush.h> #include <asm/sections.h> @@ -42,14 +43,7 @@ int rodata_test(void) ".section .fixup,\"ax\"\n" "2: jmp 1b\n" ".previous\n" - ".section __ex_table,\"a\"\n" - " .align 16\n" -#ifdef CONFIG_X86_32 - " .long 0b,2b\n" -#else - " .quad 0b,2b\n" -#endif - ".previous" + _ASM_EXTABLE(0b,2b) : [rslt] "=r" (result) : [rodata_test] "r" (&rodata_test_data), [zero] "r" (0UL) ); --- 2.6.38-rc5-extable.orig/arch/x86/lib/copy_user_64.S +++ 2.6.38-rc5-extable/arch/x86/lib/copy_user_64.S @@ -7,6 +7,7 @@ */ #include <linux/linkage.h> +#include <asm/asm.h> #include <asm/dwarf2.h> #define FIX_ALIGNMENT 1 @@ -56,11 +57,8 @@ jmp copy_user_handle_tail .previous - .section __ex_table,"a" - .align 8 - .quad 100b,103b - .quad 101b,103b - .previous + _ASM_EXTABLE(100b,103b) + _ASM_EXTABLE(101b,103b) #endif .endm @@ -180,29 +178,26 @@ ENTRY(copy_user_generic_unrolled) 60: jmp copy_user_handle_tail /* ecx is zerorest also */ .previous - .section __ex_table,"a" - .align 8 - .quad 1b,30b - .quad 2b,30b - .quad 3b,30b - .quad 4b,30b - .quad 5b,30b - .quad 6b,30b - .quad 7b,30b - .quad 8b,30b - .quad 9b,30b - .quad 10b,30b - .quad 11b,30b - .quad 12b,30b - .quad 13b,30b - .quad 14b,30b - .quad 15b,30b - .quad 16b,30b - .quad 18b,40b - .quad 19b,40b - .quad 21b,50b - .quad 22b,50b - .previous + _ASM_EXTABLE(1b,30b) + _ASM_EXTABLE(2b,30b) + _ASM_EXTABLE(3b,30b) + _ASM_EXTABLE(4b,30b) + _ASM_EXTABLE(5b,30b) + _ASM_EXTABLE(6b,30b) + _ASM_EXTABLE(7b,30b) + _ASM_EXTABLE(8b,30b) + _ASM_EXTABLE(9b,30b) + _ASM_EXTABLE(10b,30b) + _ASM_EXTABLE(11b,30b) + _ASM_EXTABLE(12b,30b) + _ASM_EXTABLE(13b,30b) + _ASM_EXTABLE(14b,30b) + _ASM_EXTABLE(15b,30b) + _ASM_EXTABLE(16b,30b) + _ASM_EXTABLE(18b,40b) + _ASM_EXTABLE(19b,40b) + _ASM_EXTABLE(21b,50b) + _ASM_EXTABLE(22b,50b) CFI_ENDPROC ENDPROC(copy_user_generic_unrolled) @@ -248,10 +243,7 @@ ENTRY(copy_user_generic_string) jmp copy_user_handle_tail .previous - .section __ex_table,"a" - .align 8 - .quad 1b,11b - .quad 3b,12b - .previous + _ASM_EXTABLE(1b,11b) + _ASM_EXTABLE(3b,12b) CFI_ENDPROC ENDPROC(copy_user_generic_string) --- 2.6.38-rc5-extable.orig/arch/x86/lib/copy_user_nocache_64.S +++ 2.6.38-rc5-extable/arch/x86/lib/copy_user_nocache_64.S @@ -7,6 +7,7 @@ */ #include <linux/linkage.h> +#include <asm/asm.h> #include <asm/dwarf2.h> #define FIX_ALIGNMENT 1 @@ -36,11 +37,8 @@ jmp copy_user_handle_tail .previous - .section __ex_table,"a" - .align 8 - .quad 100b,103b - .quad 101b,103b - .previous + _ASM_EXTABLE(100b,103b) + _ASM_EXTABLE(101b,103b) #endif .endm @@ -111,27 +109,25 @@ ENTRY(__copy_user_nocache) jmp copy_user_handle_tail .previous - .section __ex_table,"a" - .quad 1b,30b - .quad 2b,30b - .quad 3b,30b - .quad 4b,30b - .quad 5b,30b - .quad 6b,30b - .quad 7b,30b - .quad 8b,30b - .quad 9b,30b - .quad 10b,30b - .quad 11b,30b - .quad 12b,30b - .quad 13b,30b - .quad 14b,30b - .quad 15b,30b - .quad 16b,30b - .quad 18b,40b - .quad 19b,40b - .quad 21b,50b - .quad 22b,50b - .previous + _ASM_EXTABLE(1b,30b) + _ASM_EXTABLE(2b,30b) + _ASM_EXTABLE(3b,30b) + _ASM_EXTABLE(4b,30b) + _ASM_EXTABLE(5b,30b) + _ASM_EXTABLE(6b,30b) + _ASM_EXTABLE(7b,30b) + _ASM_EXTABLE(8b,30b) + _ASM_EXTABLE(9b,30b) + _ASM_EXTABLE(10b,30b) + _ASM_EXTABLE(11b,30b) + _ASM_EXTABLE(12b,30b) + _ASM_EXTABLE(13b,30b) + _ASM_EXTABLE(14b,30b) + _ASM_EXTABLE(15b,30b) + _ASM_EXTABLE(16b,30b) + _ASM_EXTABLE(18b,40b) + _ASM_EXTABLE(19b,40b) + _ASM_EXTABLE(21b,50b) + _ASM_EXTABLE(22b,50b) CFI_ENDPROC ENDPROC(__copy_user_nocache) --- 2.6.38-rc5-extable.orig/arch/x86/lib/csum-copy_64.S +++ 2.6.38-rc5-extable/arch/x86/lib/csum-copy_64.S @@ -6,6 +6,7 @@ * for more details. No warranty for anything given at all. */ #include <linux/linkage.h> +#include <asm/asm.h> #include <asm/dwarf2.h> #include <asm/errno.h> @@ -31,26 +32,17 @@ .macro source 10: - .section __ex_table,"a" - .align 8 - .quad 10b,.Lbad_source - .previous + _ASM_EXTABLE(10b, .Lbad_source) .endm .macro dest 20: - .section __ex_table,"a" - .align 8 - .quad 20b,.Lbad_dest - .previous + _ASM_EXTABLE(20b, .Lbad_dest) .endm .macro ignore L=.Lignore 30: - .section __ex_table,"a" - .align 8 - .quad 30b,\L - .previous + _ASM_EXTABLE(30b, \L) .endm --- 2.6.38-rc5-extable.orig/arch/x86/lib/getuser.S +++ 2.6.38-rc5-extable/arch/x86/lib/getuser.S @@ -95,10 +95,9 @@ bad_get_user: CFI_ENDPROC END(bad_get_user) -.section __ex_table,"a" - _ASM_PTR 1b,bad_get_user - _ASM_PTR 2b,bad_get_user - _ASM_PTR 3b,bad_get_user + _ASM_EXTABLE(1b, bad_get_user) + _ASM_EXTABLE(2b, bad_get_user) + _ASM_EXTABLE(3b, bad_get_user) #ifdef CONFIG_X86_64 - _ASM_PTR 4b,bad_get_user + _ASM_EXTABLE(4b, bad_get_user) #endif --- 2.6.38-rc5-extable.orig/arch/x86/lib/putuser.S +++ 2.6.38-rc5-extable/arch/x86/lib/putuser.S @@ -86,12 +86,10 @@ bad_put_user: EXIT END(bad_put_user) -.section __ex_table,"a" - _ASM_PTR 1b,bad_put_user - _ASM_PTR 2b,bad_put_user - _ASM_PTR 3b,bad_put_user - _ASM_PTR 4b,bad_put_user + _ASM_EXTABLE(1b, bad_put_user) + _ASM_EXTABLE(2b, bad_put_user) + _ASM_EXTABLE(3b, bad_put_user) + _ASM_EXTABLE(4b, bad_put_user) #ifdef CONFIG_X86_32 - _ASM_PTR 5b,bad_put_user + _ASM_EXTABLE(5b, bad_put_user) #endif -.previous -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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