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authorRoland McGrath <roland@redhat.com>2007-01-26 03:56:46 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-01-26 16:50:58 -0500
commita1f3bb9ae4497a2ed3eac773fd7798ac33a0371f (patch)
tree18a8b6a9a26f2148e67109d79d2fe0c330fdeb64 /include/asm-i386
parent7f6ee1adc75bf31d1b76814338f76a88e653cb60 (diff)
[PATCH] Fix CONFIG_COMPAT_VDSO
I wouldn't mind if CONFIG_COMPAT_VDSO went away entirely. But if it's there, it should work properly. Currently it's quite haphazard: both real vma and fixmap are mapped, both are put in the two different AT_* slots, sysenter returns to the vma address rather than the fixmap address, and core dumps yet are another story. This patch makes CONFIG_COMPAT_VDSO disable the real vma and use the fixmap area consistently. This makes it actually compatible with what the old vdso implementation did. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-i386')
-rw-r--r--include/asm-i386/elf.h7
-rw-r--r--include/asm-i386/fixmap.h2
-rw-r--r--include/asm-i386/page.h2
3 files changed, 7 insertions, 4 deletions
diff --git a/include/asm-i386/elf.h b/include/asm-i386/elf.h
index 45d21a0c95b..0515d61d541 100644
--- a/include/asm-i386/elf.h
+++ b/include/asm-i386/elf.h
@@ -143,11 +143,8 @@ extern int dump_task_extended_fpu (struct task_struct *, struct user_fxsr_struct
143# define VDSO_PRELINK 0 143# define VDSO_PRELINK 0
144#endif 144#endif
145 145
146#define VDSO_COMPAT_SYM(x) \
147 (VDSO_COMPAT_BASE + (unsigned long)(x) - VDSO_PRELINK)
148
149#define VDSO_SYM(x) \ 146#define VDSO_SYM(x) \
150 (VDSO_BASE + (unsigned long)(x) - VDSO_PRELINK) 147 (VDSO_COMPAT_BASE + (unsigned long)(x) - VDSO_PRELINK)
151 148
152#define VDSO_HIGH_EHDR ((const struct elfhdr *) VDSO_HIGH_BASE) 149#define VDSO_HIGH_EHDR ((const struct elfhdr *) VDSO_HIGH_BASE)
153#define VDSO_EHDR ((const struct elfhdr *) VDSO_COMPAT_BASE) 150#define VDSO_EHDR ((const struct elfhdr *) VDSO_COMPAT_BASE)
@@ -156,10 +153,12 @@ extern void __kernel_vsyscall;
156 153
157#define VDSO_ENTRY VDSO_SYM(&__kernel_vsyscall) 154#define VDSO_ENTRY VDSO_SYM(&__kernel_vsyscall)
158 155
156#ifndef CONFIG_COMPAT_VDSO
159#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 157#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
160struct linux_binprm; 158struct linux_binprm;
161extern int arch_setup_additional_pages(struct linux_binprm *bprm, 159extern int arch_setup_additional_pages(struct linux_binprm *bprm,
162 int executable_stack); 160 int executable_stack);
161#endif
163 162
164extern unsigned int vdso_enabled; 163extern unsigned int vdso_enabled;
165 164
diff --git a/include/asm-i386/fixmap.h b/include/asm-i386/fixmap.h
index 02428cb3662..3e9f610c35d 100644
--- a/include/asm-i386/fixmap.h
+++ b/include/asm-i386/fixmap.h
@@ -23,6 +23,8 @@
23extern unsigned long __FIXADDR_TOP; 23extern unsigned long __FIXADDR_TOP;
24#else 24#else
25#define __FIXADDR_TOP 0xfffff000 25#define __FIXADDR_TOP 0xfffff000
26#define FIXADDR_USER_START __fix_to_virt(FIX_VDSO)
27#define FIXADDR_USER_END __fix_to_virt(FIX_VDSO - 1)
26#endif 28#endif
27 29
28#ifndef __ASSEMBLY__ 30#ifndef __ASSEMBLY__
diff --git a/include/asm-i386/page.h b/include/asm-i386/page.h
index fd3f64ace24..7b19f454761 100644
--- a/include/asm-i386/page.h
+++ b/include/asm-i386/page.h
@@ -143,7 +143,9 @@ extern int page_is_ram(unsigned long pagenr);
143#include <asm-generic/memory_model.h> 143#include <asm-generic/memory_model.h>
144#include <asm-generic/page.h> 144#include <asm-generic/page.h>
145 145
146#ifndef CONFIG_COMPAT_VDSO
146#define __HAVE_ARCH_GATE_AREA 1 147#define __HAVE_ARCH_GATE_AREA 1
148#endif
147#endif /* __KERNEL__ */ 149#endif /* __KERNEL__ */
148 150
149#endif /* _I386_PAGE_H */ 151#endif /* _I386_PAGE_H */