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| author | Markus F.X.J. Oberhumer <markus@oberhumer.com> | 2007-04-23 12:00:05 +0200 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2007-05-08 11:22:59 -0700 |
| commit | 66761522a7bca951c1214498b80260533957e3ad (patch) | |
| tree | 7813ff92c8e661b9990fb2049426f76d522e6bf5 | |
| parent | 0e17b560985afb5190e859d5d4609237a91bb732 (diff) | |
| download | blackbird-op-linux-66761522a7bca951c1214498b80260533957e3ad.tar.gz blackbird-op-linux-66761522a7bca951c1214498b80260533957e3ad.zip | |
[IA64] fix stack alignment for ia32 signal handlers
This fixes the setup of the alignment of the signal frame, so that all
signal handlers are run with a properly aligned stack frame.
The current code "over-aligns" the stack pointer so that the stack frame
is effectively always mis-aligned by 4 bytes. But what we really want
is that on function entry ((sp + 4) & 15) == 0, which matches what would
happen if the stack were aligned before a "call" instruction.
i386 and x86_64 are already fixed by d347f372273c2b3d86a66e2e1c94c790c208e166
Signed-off-by: Markus F.X.J. Oberhumer <markus@oberhumer.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
| -rw-r--r-- | arch/ia64/ia32/ia32_signal.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/ia64/ia32/ia32_signal.c b/arch/ia64/ia32/ia32_signal.c index b3355a9ca2c3..7b38b73e7827 100644 --- a/arch/ia64/ia32/ia32_signal.c +++ b/arch/ia64/ia32/ia32_signal.c @@ -811,7 +811,11 @@ get_sigframe (struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) } /* Legacy stack switching not supported */ - return (void __user *)((esp - frame_size) & -8ul); + esp -= frame_size; + /* Align the stack pointer according to the i386 ABI, + * i.e. so that on function entry ((sp + 4) & 15) == 0. */ + esp = ((esp + 4) & -16ul) - 4; + return (void __user *) esp; } static int |
