From 024e8ac04453b3525448c31ef39848cf675ba6db Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Fri, 25 Jul 2008 20:00:10 -0700 Subject: [PATCH] x86_64: fix ia32 AMD syscall audit fast-path The new code in commit 5cbf1565f29eb57a86a305b08836613508e294d7 has a bug in the version supporting the AMD 'syscall' instruction. It clobbers the user's %ecx register value (with the %ebp value). This change fixes it. Signed-off-by: Roland McGrath --- arch/x86/ia32/ia32entry.S | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S index e4bd1793a5e4..ffc1bb4fed7d 100644 --- a/arch/x86/ia32/ia32entry.S +++ b/arch/x86/ia32/ia32entry.S @@ -201,7 +201,7 @@ sysexit_from_sys_call: movl RDI-ARGOFFSET(%rsp),%r8d /* reload 5th syscall arg */ .endm - .macro auditsys_exit exit + .macro auditsys_exit exit,ebpsave=RBP testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),TI_flags(%r10) jnz int_ret_from_sys_call TRACE_IRQS_ON @@ -214,7 +214,7 @@ sysexit_from_sys_call: call audit_syscall_exit GET_THREAD_INFO(%r10) movl RAX-ARGOFFSET(%rsp),%eax /* reload syscall return value */ - movl RBP-ARGOFFSET(%rsp),%ebp /* reload user register value */ + movl \ebpsave-ARGOFFSET(%rsp),%ebp /* reload user register value */ movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi cli TRACE_IRQS_OFF @@ -347,7 +347,7 @@ cstar_auditsys: jmp cstar_dispatch sysretl_audit: - auditsys_exit sysretl_from_sys_call + auditsys_exit sysretl_from_sys_call, RCX /* user %ebp in RCX slot */ #endif cstar_tracesys: