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| author | Roland McGrath <roland@redhat.com> | 2008-01-30 15:30:44 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 15:30:44 +0300 |
| commit | 69d0627a7f6e891189124d784d2fa90cae7c449a (patch) | |
| tree | f39140f454b98a28846df7d0a1b9279a8b3b8d97 /arch/x86/vdso/vdso32/syscall.S | |
| parent | 16f4bc738d616962a844e80f7b1fcb52c626542a (diff) | |
| download | linux-69d0627a7f6e891189124d784d2fa90cae7c449a.tar.xz | |
x86 vDSO: reorder vdso32 code
This reorders the code in the 32-bit vDSO images to put the signal
trampolines first and __kernel_vsyscall after them. The order does
not matter to userland, it just uses what AT_SYSINFO or e_entry
says. Since the signal trampolines are the same size in both
versions of the vDSO, putting them first is the simplest way to get
the addresses to line up. This makes it work to use a more compact
layout for the vDSO.
Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/vdso/vdso32/syscall.S')
| -rw-r--r-- | arch/x86/vdso/vdso32/syscall.S | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/arch/x86/vdso/vdso32/syscall.S b/arch/x86/vdso/vdso32/syscall.S index 333bfb552c88..fe88d34f822f 100644 --- a/arch/x86/vdso/vdso32/syscall.S +++ b/arch/x86/vdso/vdso32/syscall.S @@ -1,13 +1,18 @@ /* - * Code for the vsyscall page. This version uses the syscall instruction. + * Code for the vDSO. This version uses the syscall instruction. + * + * First get the common code for the sigreturn entry points. + * This must come first. */ +#define SYSCALL_ENTER_KERNEL syscall +#include "sigreturn.S" -#include <asm/asm-offsets.h> #include <asm/segment.h> .text .globl __kernel_vsyscall .type __kernel_vsyscall,@function + ALIGN __kernel_vsyscall: .LSTART_vsyscall: push %ebp @@ -61,9 +66,12 @@ __kernel_vsyscall: .uleb128 4 .align 4 .LENDFDE1: + .previous -/* - * Get the common code for the sigreturn entry points. - */ -#define SYSCALL_ENTER_KERNEL syscall -#include "sigreturn.S" + /* + * Pad out the segment to match the size of the sysenter.S version. + */ +VDSO32_vsyscall_eh_frame_size = 0x44 + .section .data,"aw",@progbits + .space VDSO32_vsyscall_eh_frame_size-(.LENDFDE1-.LSTARTFRAME), 0 + .previous |