H. Peter Anvin 7ca0758cdb x86-32, vdso: On system call restart after SYSENTER, use int $0x80 ... When we enter a 32-bit system call via SYSENTER or SYSCALL, we shuffle the arguments to match the int $0x80 calling convention. This was probably a design mistake, but it's what it is now. This causes errors if the system call as to be restarted. For SYSENTER, we have to invoke the instruction from the vdso as the return address is hardcoded. Accordingly, we can simply replace the jump in the vdso with an int $0x80 instruction and use the slower entry point for a post-restart. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Link: http://lkml.kernel.org/r/CA%2B55aFztZ=r5wa0x26KJQxvZOaQq8s2v3u50wCyJcA-Sc4g8gQ@mail.gmail.com Cc: <stable@kernel.org>		2011-08-23 16:20:10 -07:00
..
.gitignore	x86: gitignore arch/x86/vdso files	2008-01-30 13:32:32 +01:00
int80.S	x86 vDSO: canonicalize sysenter .eh_frame	2008-01-30 13:30:44 +01:00
note.S	x86 vDSO: i386 vdso32	2008-01-30 13:30:42 +01:00
sigreturn.S	x86: use generic register names in struct sigcontext	2008-01-30 13:30:56 +01:00
syscall.S	x86 vDSO: canonicalize sysenter .eh_frame	2008-01-30 13:30:44 +01:00
sysenter.S	x86-32, vdso: On system call restart after SYSENTER, use int $0x80	2011-08-23 16:20:10 -07:00
vdso32.lds.S	x86 vDSO: vdso32 build	2008-01-30 13:30:42 +01:00