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-rw-r--r--arch/x86/vdso/vdso32/int80.S21
-rw-r--r--arch/x86/vdso/vdso32/sigreturn.S20
-rw-r--r--arch/x86/vdso/vdso32/syscall.S22
-rw-r--r--arch/x86/vdso/vdso32/sysenter.S21
4 files changed, 47 insertions, 37 deletions
diff --git a/arch/x86/vdso/vdso32/int80.S b/arch/x86/vdso/vdso32/int80.S
index 3c8e4c62ace..be4b7a9a7cd 100644
--- a/arch/x86/vdso/vdso32/int80.S
+++ b/arch/x86/vdso/vdso32/int80.S
@@ -1,15 +1,15 @@
/*
- * Code for the vsyscall page. This version uses the old int $0x80 method.
+ * Code for the vDSO. This version uses the old int $0x80 method.
*
- * NOTE:
- * 1) __kernel_vsyscall _must_ be first in this page.
- * 2) there are alignment constraints on this stub, see vsyscall-sigreturn.S
- * for details.
+ * 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
+ ALIGN
__kernel_vsyscall:
.LSTART_vsyscall:
int $0x80
@@ -47,7 +47,10 @@ __kernel_vsyscall:
.LENDFDEDLSI:
.previous
-/*
- * Get the common code for the sigreturn entry points.
- */
-#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-(.LENDFDEDLSI-.LSTARTFRAMEDLSI), 0
+ .previous
diff --git a/arch/x86/vdso/vdso32/sigreturn.S b/arch/x86/vdso/vdso32/sigreturn.S
index 8d65a0a0eb7..cade2752928 100644
--- a/arch/x86/vdso/vdso32/sigreturn.S
+++ b/arch/x86/vdso/vdso32/sigreturn.S
@@ -1,11 +1,12 @@
/*
- * Common code for the sigreturn entry points on the vsyscall page.
+ * 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 vsyscall-*.S to define them after the
- * vsyscall entry point. The kernel assumes that the addresses of these
- * routines are constant for all vsyscall implementations.
+ * 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>
@@ -13,32 +14,29 @@
#define SYSCALL_ENTER_KERNEL int $0x80
#endif
-/* XXX
- Should these be named "_sigtramp" or something?
-*/
-
.text
- .org __kernel_vsyscall+32,0x90
.globl __kernel_sigreturn
.type __kernel_sigreturn,@function
+ ALIGN
__kernel_sigreturn:
.LSTART_sigreturn:
popl %eax /* XXX does this mean it needs unwind info? */
movl $__NR_sigreturn, %eax
SYSCALL_ENTER_KERNEL
.LEND_sigreturn:
+ nop
.size __kernel_sigreturn,.-.LSTART_sigreturn
- .balign 32
.globl __kernel_rt_sigreturn
.type __kernel_rt_sigreturn,@function
+ ALIGN
__kernel_rt_sigreturn:
.LSTART_rt_sigreturn:
movl $__NR_rt_sigreturn, %eax
SYSCALL_ENTER_KERNEL
.LEND_rt_sigreturn:
+ nop
.size __kernel_rt_sigreturn,.-.LSTART_rt_sigreturn
- .balign 32
.previous
.section .eh_frame,"a",@progbits
diff --git a/arch/x86/vdso/vdso32/syscall.S b/arch/x86/vdso/vdso32/syscall.S
index 333bfb552c8..fe88d34f822 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
diff --git a/arch/x86/vdso/vdso32/sysenter.S b/arch/x86/vdso/vdso32/sysenter.S
index 109bfa394ea..902d5fc11f1 100644
--- a/arch/x86/vdso/vdso32/sysenter.S
+++ b/arch/x86/vdso/vdso32/sysenter.S
@@ -1,11 +1,10 @@
/*
- * Code for the vsyscall page. This version uses the sysenter instruction.
+ * Code for the vDSO. This version uses the sysenter instruction.
*
- * NOTE:
- * 1) __kernel_vsyscall _must_ be first in this page.
- * 2) there are alignment constraints on this stub, see vsyscall-sigreturn.S
- * for details.
+ * First get the common code for the sigreturn entry points.
+ * This must come first.
*/
+#include "sigreturn.S"
/*
* The caller puts arg2 in %ecx, which gets pushed. The kernel will use
@@ -23,11 +22,12 @@
* arg6 from the stack.
*
* You can not use this vsyscall for the clone() syscall because the
- * three dwords on the parent stack do not get copied to the child.
+ * three words on the parent stack do not get copied to the child.
*/
.text
.globl __kernel_vsyscall
.type __kernel_vsyscall,@function
+ ALIGN
__kernel_vsyscall:
.LSTART_vsyscall:
push %ecx
@@ -115,7 +115,8 @@ VDSO32_SYSENTER_RETURN: /* Symbol used by sysenter.c via vdso32-syms.h */
.LENDFDEDLSI:
.previous
-/*
- * Get the common code for the sigreturn entry points.
- */
-#include "sigreturn.S"
+ /*
+ * Emit a symbol with the size of this .eh_frame data,
+ * to verify it matches the other versions.
+ */
+VDSO32_vsyscall_eh_frame_size = (.LENDFDEDLSI-.LSTARTFRAMEDLSI)