diff options
| 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 | cadd516422d9382313144aa58f9e46ee7a2c0a28 (patch) | |
| tree | 84cb8aa63f068bd4609723b43cdfd41ec74c9665 /arch/x86/vdso | |
| parent | 16e48e7e7929d841273d87027079660bca5e37bd (diff) | |
| download | linux-cadd516422d9382313144aa58f9e46ee7a2c0a28.tar.xz | |
x86 vDSO: canonicalize sysenter .eh_frame
Some assembler versions automagically optimize .eh_frame contents,
changing their size. The CFI in sysenter.S was not using optimal
formatting, so it would be changed by newer/smarter assemblers.
This ran afoul of the wired constant for padding out the other vDSO
images to match its size. This changes the original hand-coded
source to use the optimal format encoding for its operations. That
leaves nothing more for a fancy assembler to do, so the sizes will
match the wired-in expected size regardless of the assembler version.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/vdso')
| -rw-r--r-- | arch/x86/vdso/vdso32/int80.S | 2 | ||||
| -rw-r--r-- | arch/x86/vdso/vdso32/syscall.S | 2 | ||||
| -rw-r--r-- | arch/x86/vdso/vdso32/sysenter.S | 18 |
3 files changed, 8 insertions, 14 deletions
diff --git a/arch/x86/vdso/vdso32/int80.S b/arch/x86/vdso/vdso32/int80.S index be4b7a9a7cdd..b15b7c01aedb 100644 --- a/arch/x86/vdso/vdso32/int80.S +++ b/arch/x86/vdso/vdso32/int80.S @@ -50,7 +50,7 @@ __kernel_vsyscall: /* * Pad out the segment to match the size of the sysenter.S version. */ -VDSO32_vsyscall_eh_frame_size = 0x44 +VDSO32_vsyscall_eh_frame_size = 0x40 .section .data,"aw",@progbits .space VDSO32_vsyscall_eh_frame_size-(.LENDFDEDLSI-.LSTARTFRAMEDLSI), 0 .previous diff --git a/arch/x86/vdso/vdso32/syscall.S b/arch/x86/vdso/vdso32/syscall.S index fe88d34f822f..5415b5613d55 100644 --- a/arch/x86/vdso/vdso32/syscall.S +++ b/arch/x86/vdso/vdso32/syscall.S @@ -71,7 +71,7 @@ __kernel_vsyscall: /* * Pad out the segment to match the size of the sysenter.S version. */ -VDSO32_vsyscall_eh_frame_size = 0x44 +VDSO32_vsyscall_eh_frame_size = 0x40 .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 902d5fc11f1b..e2800affa754 100644 --- a/arch/x86/vdso/vdso32/sysenter.S +++ b/arch/x86/vdso/vdso32/sysenter.S @@ -84,31 +84,25 @@ VDSO32_SYSENTER_RETURN: /* Symbol used by sysenter.c via vdso32-syms.h */ .uleb128 0 /* What follows are the instructions for the table generation. We have to record all changes of the stack pointer. */ - .byte 0x04 /* DW_CFA_advance_loc4 */ - .long .Lpush_ecx-.LSTART_vsyscall + .byte 0x40 + (.Lpush_ecx-.LSTART_vsyscall) /* DW_CFA_advance_loc */ .byte 0x0e /* DW_CFA_def_cfa_offset */ .byte 0x08 /* RA at offset 8 now */ - .byte 0x04 /* DW_CFA_advance_loc4 */ - .long .Lpush_edx-.Lpush_ecx + .byte 0x40 + (.Lpush_edx-.Lpush_ecx) /* DW_CFA_advance_loc */ .byte 0x0e /* DW_CFA_def_cfa_offset */ .byte 0x0c /* RA at offset 12 now */ - .byte 0x04 /* DW_CFA_advance_loc4 */ - .long .Lenter_kernel-.Lpush_edx + .byte 0x40 + (.Lenter_kernel-.Lpush_edx) /* DW_CFA_advance_loc */ .byte 0x0e /* DW_CFA_def_cfa_offset */ .byte 0x10 /* RA at offset 16 now */ .byte 0x85, 0x04 /* DW_CFA_offset %ebp -16 */ /* Finally the epilogue. */ - .byte 0x04 /* DW_CFA_advance_loc4 */ - .long .Lpop_ebp-.Lenter_kernel + .byte 0x40 + (.Lpop_ebp-.Lenter_kernel) /* DW_CFA_advance_loc */ .byte 0x0e /* DW_CFA_def_cfa_offset */ .byte 0x0c /* RA at offset 12 now */ .byte 0xc5 /* DW_CFA_restore %ebp */ - .byte 0x04 /* DW_CFA_advance_loc4 */ - .long .Lpop_edx-.Lpop_ebp + .byte 0x40 + (.Lpop_edx-.Lpop_ebp) /* DW_CFA_advance_loc */ .byte 0x0e /* DW_CFA_def_cfa_offset */ .byte 0x08 /* RA at offset 8 now */ - .byte 0x04 /* DW_CFA_advance_loc4 */ - .long .Lpop_ecx-.Lpop_edx + .byte 0x40 + (.Lpop_ecx-.Lpop_edx) /* DW_CFA_advance_loc */ .byte 0x0e /* DW_CFA_def_cfa_offset */ .byte 0x04 /* RA at offset 4 now */ .align 4 |