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authorRoland McGrath <roland@redhat.com>2008-01-30 13:30:43 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:30:43 +0100
commitaf65d64845a90c8f2fc90b97e2148ff74672e979 (patch)
treee70a57a9635acaf8154c150f95e11dcb51937fd8 /arch/x86/ia32
parent00f8b1bc0e44ba94fb33e1fbd8ac82841d7cc570 (diff)
x86 vDSO: consolidate vdso32
This makes x86_64's ia32 emulation support share the sources used in the 32-bit kernel for the 32-bit vDSO and much of its setup code. The 32-bit vDSO mapping now behaves the same on x86_64 as on native 32-bit. The abi.syscall32 sysctl on x86_64 now takes the same values that vm.vdso_enabled takes on the 32-bit kernel. That is, 1 means a randomized vDSO location, 2 means the fixed old address. The CONFIG_COMPAT_VDSO option is now available to make this the default setting, the same meaning it has for the 32-bit kernel. (This does not affect the 64-bit vDSO.) The argument vdso32=[012] can be used on both 32-bit and 64-bit kernels to set this paramter at boot time. The vdso=[012] argument still does this same thing on the 32-bit kernel. 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/ia32')
-rw-r--r--arch/x86/ia32/Makefile2
-rw-r--r--arch/x86/ia32/ia32_binfmt.c9
-rw-r--r--arch/x86/ia32/ia32_signal.c22
3 files changed, 19 insertions, 14 deletions
diff --git a/arch/x86/ia32/Makefile b/arch/x86/ia32/Makefile
index a3c997e9f39a..1f58a21a41dc 100644
--- a/arch/x86/ia32/Makefile
+++ b/arch/x86/ia32/Makefile
@@ -3,7 +3,7 @@
#
obj-$(CONFIG_IA32_EMULATION) := ia32entry.o sys_ia32.o ia32_signal.o tls32.o \
- ia32_binfmt.o fpu32.o ptrace32.o syscall32.o syscall32_syscall.o
+ ia32_binfmt.o fpu32.o ptrace32.o
sysv-$(CONFIG_SYSVIPC) := ipc32.o
obj-$(CONFIG_IA32_EMULATION) += $(sysv-y)
diff --git a/arch/x86/ia32/ia32_binfmt.c b/arch/x86/ia32/ia32_binfmt.c
index 55822d2cf053..e32974c3dd3b 100644
--- a/arch/x86/ia32/ia32_binfmt.c
+++ b/arch/x86/ia32/ia32_binfmt.c
@@ -26,7 +26,7 @@
#include <asm/i387.h>
#include <asm/uaccess.h>
#include <asm/ia32.h>
-#include <asm/vsyscall32.h>
+#include <asm/vdso.h>
#undef ELF_ARCH
#undef ELF_CLASS
@@ -47,14 +47,13 @@
#define AT_SYSINFO 32
#define AT_SYSINFO_EHDR 33
-int sysctl_vsyscall32 = 1;
+extern int sysctl_vsyscall32;
#undef ARCH_DLINFO
#define ARCH_DLINFO do { \
if (sysctl_vsyscall32) { \
- current->mm->context.vdso = (void *)VSYSCALL32_BASE; \
- NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \
- NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE); \
+ NEW_AUX_ENT(AT_SYSINFO, (u32)VDSO_ENTRY); \
+ NEW_AUX_ENT(AT_SYSINFO_EHDR, (u32)VDSO_CURRENT_BASE); \
} \
} while(0)
diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index 0fc5d8563e19..39356a756b28 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -31,7 +31,7 @@
#include <asm/sigcontext32.h>
#include <asm/fpu32.h>
#include <asm/proto.h>
-#include <asm/vsyscall32.h>
+#include <asm/vdso.h>
#define DEBUG_SIG 0
@@ -465,13 +465,16 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
goto give_sigsegv;
}
- /* Return stub is in 32bit vsyscall page */
- if (current->binfmt->hasvdso)
- restorer = VSYSCALL32_SIGRETURN;
- else
- restorer = (void *)&frame->retcode;
- if (ka->sa.sa_flags & SA_RESTORER)
+ if (ka->sa.sa_flags & SA_RESTORER) {
restorer = ka->sa.sa_restorer;
+ } else {
+ /* Return stub is in 32bit vsyscall page */
+ if (current->binfmt->hasvdso)
+ restorer = VDSO32_SYMBOL(current->mm->context.vdso,
+ sigreturn);
+ else
+ restorer = (void *)&frame->retcode;
+ }
err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
/*
@@ -519,7 +522,7 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
{
struct rt_sigframe __user *frame;
struct exec_domain *ed = current_thread_info()->exec_domain;
- void __user *restorer = VSYSCALL32_RTSIGRETURN;
+ void __user *restorer;
int err = 0;
/* __copy_to_user optimizes that into a single 8 byte store */
@@ -564,6 +567,9 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
if (ka->sa.sa_flags & SA_RESTORER)
restorer = ka->sa.sa_restorer;
+ else
+ restorer = VDSO32_SYMBOL(current->mm->context.vdso,
+ rt_sigreturn);
err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
/*