x86, asm: Flip RESTORE_ARGS arguments logic

... thus getting rid of the "else" part of the conditional statement in the macro. No functionality change. Signed-off-by: Borislav Petkov <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: H. Peter Anvin <[email protected]>
jadonk · Jun 3, 2011 · 838feb4 · 838feb4
1 parent cac0e0a
commit 838feb4
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Showing 3 changed files with 12 additions and 17 deletions.
diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
@@ -173,7 +173,7 @@ sysexit_from_sys_call:
 	andl  $~0x200,EFLAGS-R11(%rsp) 
 	movl	RIP-R11(%rsp),%edx		/* User %eip */
 	CFI_REGISTER rip,rdx
-	RESTORE_ARGS 1,24,1,1,1,1
+	RESTORE_ARGS 0,24,0,0,0,0
 	xorq	%r8,%r8
 	xorq	%r9,%r9
 	xorq	%r10,%r10
@@ -328,7 +328,7 @@ cstar_dispatch:
 	jnz sysretl_audit
 sysretl_from_sys_call:
 	andl $~TS_COMPAT,TI_status(%r10)
-	RESTORE_ARGS 1,-ARG_SKIP,1,1,1
+	RESTORE_ARGS 0,-ARG_SKIP,0,0,0
 	movl RIP-ARGOFFSET(%rsp),%ecx
 	CFI_REGISTER rip,rcx
 	movl EFLAGS-ARGOFFSET(%rsp),%r11d	

diff --git a/arch/x86/include/asm/calling.h b/arch/x86/include/asm/calling.h
@@ -109,32 +109,27 @@ For 32-bit we have the following conventions - kernel is built with
 
 #define ARG_SKIP	(9*8)
 
-	.macro RESTORE_ARGS skiprax=0, addskip=0, skiprcx=0, skipr11=0, \
-			    skipr8910=0, skiprdx=0
-	.if \skipr11
-	.else
+	.macro RESTORE_ARGS rstor_rax=1, addskip=0, rstor_rcx=1, rstor_r11=1, \
+			    rstor_r8910=1, rstor_rdx=1
+	.if \rstor_r11
 	movq_cfi_restore 0*8, r11
 	.endif
 
-	.if \skipr8910
-	.else
+	.if \rstor_r8910
 	movq_cfi_restore 1*8, r10
 	movq_cfi_restore 2*8, r9
 	movq_cfi_restore 3*8, r8
 	.endif
 
-	.if \skiprax
-	.else
+	.if \rstor_rax
 	movq_cfi_restore 4*8, rax
 	.endif
 
-	.if \skiprcx
-	.else
+	.if \rstor_rcx
 	movq_cfi_restore 5*8, rcx
 	.endif
 
-	.if \skiprdx
-	.else
+	.if \rstor_rdx
 	movq_cfi_restore 6*8, rdx
 	.endif
 
@@ -193,7 +188,7 @@ For 32-bit we have the following conventions - kernel is built with
 
 	.macro RESTORE_ALL addskip=0
 	RESTORE_REST
-	RESTORE_ARGS 0, \addskip
+	RESTORE_ARGS 1, \addskip
 	.endm
 
 	.macro icebp

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
@@ -508,7 +508,7 @@ sysret_check:
 	TRACE_IRQS_ON
 	movq RIP-ARGOFFSET(%rsp),%rcx
 	CFI_REGISTER	rip,rcx
-	RESTORE_ARGS 0,-ARG_SKIP,1
+	RESTORE_ARGS 1,-ARG_SKIP,0
 	/*CFI_REGISTER	rflags,r11*/
 	movq	PER_CPU_VAR(old_rsp), %rsp
 	USERGS_SYSRET64
@@ -858,7 +858,7 @@ retint_restore_args:	/* return to kernel space */
 	 */
 	TRACE_IRQS_IRETQ
 restore_args:
-	RESTORE_ARGS 0,8,0
+	RESTORE_ARGS 1,8,1
 
 irq_return:
 	INTERRUPT_RETURN