Commit-ID: f0702555b16d31d61dc758fac6efb994c3fe3ec6 Gitweb: http://git.kernel.org/tip/f0702555b16d31d61dc758fac6efb994c3fe3ec6 Author: Andy Lutomirski <[email protected]> AuthorDate: Thu, 9 Jun 2016 13:57:04 -0700 Committer: Ingo Molnar <[email protected]> CommitDate: Tue, 14 Jun 2016 12:16:06 +0200
x86/vdso/32: Assemble sigreturn.S separately sigreturn.S was historically included by the various __kernel_vsyscall implementations due to assumptions about all the 32-bit vDSO images having the sigreturn symbols at the same address. Those assumptions were removed in v3.16, and as of v4.4, there is only a single 32-bit vDSO left. Simplify the build process by assembling sigreturn.S into a normal object file. Signed-off-by: Andy Lutomirski <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brian Gerst <[email protected]> Cc: Denys Vlasenko <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lkml.kernel.org/r/d7b6dfde3c7397aa26977320da90448363b5a7e9.1465505753.git.l...@kernel.org Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/entry/vdso/Makefile | 5 +++-- arch/x86/entry/vdso/vdso32/sigreturn.S | 8 -------- arch/x86/entry/vdso/vdso32/system_call.S | 7 +------ 3 files changed, 4 insertions(+), 16 deletions(-) diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile index 253b72e..68b63fd 100644 --- a/arch/x86/entry/vdso/Makefile +++ b/arch/x86/entry/vdso/Makefile @@ -134,7 +134,7 @@ VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf_i386 -Wl,-soname=linux-gate.so.1 override obj-dirs = $(dir $(obj)) $(obj)/vdso32/ targets += vdso32/vdso32.lds -targets += vdso32/note.o vdso32/vclock_gettime.o vdso32/system_call.o +targets += vdso32/note.o vdso32/system_call.o vdso32/sigreturn.o targets += vdso32/vclock_gettime.o KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO @@ -156,7 +156,8 @@ $(obj)/vdso32.so.dbg: FORCE \ $(obj)/vdso32/vdso32.lds \ $(obj)/vdso32/vclock_gettime.o \ $(obj)/vdso32/note.o \ - $(obj)/vdso32/system_call.o + $(obj)/vdso32/system_call.o \ + $(obj)/vdso32/sigreturn.o $(call if_changed,vdso) # diff --git a/arch/x86/entry/vdso/vdso32/sigreturn.S b/arch/x86/entry/vdso/vdso32/sigreturn.S index d7ec4e2..20633e0 100644 --- a/arch/x86/entry/vdso/vdso32/sigreturn.S +++ b/arch/x86/entry/vdso/vdso32/sigreturn.S @@ -1,11 +1,3 @@ -/* - * Common code for the sigreturn entry points in vDSO images. - * So far this code is the same for both int80 and sysenter versions. - * This file is #include'd by int80.S et al to define them first thing. - * The kernel assumes that the addresses of these routines are constant - * for all vDSO implementations. - */ - #include <linux/linkage.h> #include <asm/unistd_32.h> #include <asm/asm-offsets.h> diff --git a/arch/x86/entry/vdso/vdso32/system_call.S b/arch/x86/entry/vdso/vdso32/system_call.S index 0109ac6..ed4bc97 100644 --- a/arch/x86/entry/vdso/vdso32/system_call.S +++ b/arch/x86/entry/vdso/vdso32/system_call.S @@ -2,16 +2,11 @@ * AT_SYSINFO entry point */ +#include <linux/linkage.h> #include <asm/dwarf2.h> #include <asm/cpufeatures.h> #include <asm/alternative-asm.h> -/* - * First get the common code for the sigreturn entry points. - * This must come first. - */ -#include "sigreturn.S" - .text .globl __kernel_vsyscall .type __kernel_vsyscall,@function
