[PATCH 3/4] powerpc: Optimise 64bit syscall auditing entry path

@@ -34,6 +34,12 @@
 #include <asm/ftrace.h>
 #include <asm/hw_irq.h>
 
+/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this.  */
+#include <linux/elf-em.h>
+#define AUDIT_ARCH_PPC		(EM_PPC)
+#define AUDIT_ARCH_PPC64	(EM_PPC64|__AUDIT_ARCH_64BIT)
+#define __AUDIT_ARCH_64BIT 0x80000000
+
 /*
  * System calls.
  */

@@ -244,6 +250,10 @@ syscall_error:
 	
 /* Traced system call support */
 syscall_dotrace:
+#ifdef CONFIG_AUDITSYSCALL
+	andi.	r11,r10,(_TIF_SYSCALL_T_OR_A & ~_TIF_SYSCALL_AUDIT)
+	beq	audit_entry
+#endif
 	bl	.save_nvgprs
 	addi	r3,r1,STACK_FRAME_OVERHEAD
 	bl	.do_syscall_trace_enter

@@ -253,6 +263,7 @@ syscall_dotrace:
 	 * for the call number to look up in the table (r0).
 	 */
 	mr	r0,r3
+.Laudit_entry_return:
 	ld	r3,GPR3(r1)
 	ld	r4,GPR4(r1)
 	ld	r5,GPR5(r1)

@@ -264,6 +275,34 @@ syscall_dotrace:
 	ld	r10,TI_FLAGS(r10)
 	b	.Lsyscall_dotrace_cont
 
+#ifdef CONFIG_AUDITSYSCALL
+audit_entry:
+	ld	r4,GPR0(r1)
+	ld	r5,GPR3(r1)
+	ld	r6,GPR4(r1)
+	ld	r7,GPR5(r1)
+	ld	r8,GPR6(r1)
+
+	andi.	r11,r10,_TIF_32BIT
+	beq	1f
+
+	lis	r3,AUDIT_ARCH_PPC@h
+	ori	r3,r3,AUDIT_ARCH_PPC@l
+	clrldi	r5,r5,32
+	clrldi	r6,r6,32
+	clrldi	r7,r7,32
+	clrldi	r8,r8,32
+	bl	.__audit_syscall_entry
+	ld	r0,GPR0(r1)
+	b	.Laudit_entry_return
+
+1:	lis	r3,AUDIT_ARCH_PPC64@h
+	ori	r3,r3,AUDIT_ARCH_PPC64@l
+	bl	.__audit_syscall_entry
+	ld	r0,GPR0(r1)
+	b	.Laudit_entry_return
+#endif
+
 syscall_enosys:
 	li	r3,-ENOSYS
 	b	syscall_exit