X-Git-Url: http://git.cascardo.eti.br/?a=blobdiff_plain;f=arch%2Fx86%2Fkernel%2Fentry_64.S;h=df088bb03fb3ffec9148c7cc44cb65ef1aa36118;hb=6158fb37d1b0448252864b194d585e73e4b94406;hp=2fac1343a90b605fe41ebcde6ca965bd25021489;hpb=f58f0cba15c2d0bfbc72b1eedd0a6294e8c83419;p=cascardo%2Flinux.git

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 2fac1343a90b..df088bb03fb3 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -404,8 +404,8 @@ GLOBAL(system_call_after_swapgs)
 	 * and short:
 	 */
 	ENABLE_INTERRUPTS(CLBR_NONE)
-	SAVE_ARGS 8,0
-	movq  %rax,ORIG_RAX-ARGOFFSET(%rsp)
+	SAVE_ARGS 8, 0, rax_enosys=1
+	movq_cfi rax,(ORIG_RAX-ARGOFFSET)
 	movq  %rcx,RIP-ARGOFFSET(%rsp)
 	CFI_REL_OFFSET rip,RIP-ARGOFFSET
 	testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
@@ -417,7 +417,7 @@ system_call_fastpath:
 	andl $__SYSCALL_MASK,%eax
 	cmpl $__NR_syscall_max,%eax
 #endif
-	ja badsys
+	ja ret_from_sys_call  /* and return regs->ax */
 	movq %r10,%rcx
 	call *sys_call_table(,%rax,8)  # XXX:	 rip relative
 	movq %rax,RAX-ARGOFFSET(%rsp)
@@ -476,27 +476,7 @@ sysret_signal:
 	FIXUP_TOP_OF_STACK %r11, -ARGOFFSET
 	jmp int_check_syscall_exit_work
 
-badsys:
-	movq $-ENOSYS,RAX-ARGOFFSET(%rsp)
-	jmp ret_from_sys_call
-
 #ifdef CONFIG_AUDITSYSCALL
-	/*
-	 * Fast path for syscall audit without full syscall trace.
-	 * We just call __audit_syscall_entry() directly, and then
-	 * jump back to the normal fast path.
-	 */
-auditsys:
-	movq %r10,%r9			/* 6th arg: 4th syscall arg */
-	movq %rdx,%r8			/* 5th arg: 3rd syscall arg */
-	movq %rsi,%rcx			/* 4th arg: 2nd syscall arg */
-	movq %rdi,%rdx			/* 3rd arg: 1st syscall arg */
-	movq %rax,%rsi			/* 2nd arg: syscall number */
-	movl $AUDIT_ARCH_X86_64,%edi	/* 1st arg: audit arch */
-	call __audit_syscall_entry
-	LOAD_ARGS 0		/* reload call-clobbered registers */
-	jmp system_call_fastpath
-
 	/*
 	 * Return fast path for syscall audit.  Call __audit_syscall_exit()
 	 * directly and then jump back to the fast path with TIF_SYSCALL_AUDIT
@@ -514,18 +494,25 @@ sysret_audit:
 
 	/* Do syscall tracing */
 tracesys:
-#ifdef CONFIG_AUDITSYSCALL
-	testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
-	jz auditsys
-#endif
+	leaq -REST_SKIP(%rsp), %rdi
+	movq $AUDIT_ARCH_X86_64, %rsi
+	call syscall_trace_enter_phase1
+	test %rax, %rax
+	jnz tracesys_phase2		/* if needed, run the slow path */
+	LOAD_ARGS 0			/* else restore clobbered regs */
+	jmp system_call_fastpath	/*      and return to the fast path */
+
+tracesys_phase2:
 	SAVE_REST
-	movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
 	FIXUP_TOP_OF_STACK %rdi
-	movq %rsp,%rdi
-	call syscall_trace_enter
+	movq %rsp, %rdi
+	movq $AUDIT_ARCH_X86_64, %rsi
+	movq %rax,%rdx
+	call syscall_trace_enter_phase2
+
 	/*
 	 * Reload arg registers from stack in case ptrace changed them.
-	 * We don't reload %rax because syscall_trace_enter() returned
+	 * We don't reload %rax because syscall_trace_entry_phase2() returned
 	 * the value it wants us to use in the table lookup.
 	 */
 	LOAD_ARGS ARGOFFSET, 1
@@ -536,7 +523,7 @@ tracesys:
 	andl $__SYSCALL_MASK,%eax
 	cmpl $__NR_syscall_max,%eax
 #endif
-	ja   int_ret_from_sys_call	/* RAX(%rsp) set to -ENOSYS above */
+	ja   int_ret_from_sys_call	/* RAX(%rsp) is already set */
 	movq %r10,%rcx	/* fixup for C */
 	call *sys_call_table(,%rax,8)
 	movq %rax,RAX-ARGOFFSET(%rsp)