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From:   Lai Jiangshan <jiangshanlai@gmail.com>
To:     linux-kernel@vger.kernel.org
Cc:     Lai Jiangshan <laijs@linux.alibaba.com>,
        Andy Lutomirski <luto@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>
Subject: [PATCH V2 19/41] x86/entry: move PUSH_AND_CLEAR_REGS out of paranoid_entry
Date:   Sun, 26 Sep 2021 23:08:16 +0800
Message-Id: <20210926150838.197719-20-jiangshanlai@gmail.com>
In-Reply-To: <20210926150838.197719-1-jiangshanlai@gmail.com>
References: <20210926150838.197719-1-jiangshanlai@gmail.com>
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From: Lai Jiangshan <laijs@linux.alibaba.com>

It is prepared for converting the whole paranoid_entry() into C code.

No functional change intended.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
---
 arch/x86/entry/entry_64.S | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index a0d73dc0d2f3..bd6bce341360 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -322,9 +322,6 @@ SYM_CODE_END(ret_from_fork)
  */
 .macro idtentry_body cfunc has_error_code:req
 
-	PUSH_AND_CLEAR_REGS
-	ENCODE_FRAME_POINTER
-
 	movq	%rsp, %rdi
 	call	error_entry
 	movq	%rax, %rsp			/* switch stack settled by sync_regs() */
@@ -376,6 +373,9 @@ SYM_CODE_START(\asmsym)
 .Lfrom_usermode_no_gap_\@:
 	.endif
 
+	PUSH_AND_CLEAR_REGS
+	ENCODE_FRAME_POINTER
+
 	idtentry_body \cfunc \has_error_code
 
 _ASM_NOKPROBE(\asmsym)
@@ -427,11 +427,14 @@ SYM_CODE_START(\asmsym)
 
 	pushq	$-1			/* ORIG_RAX: no syscall to restart */
 
+	PUSH_AND_CLEAR_REGS
+	ENCODE_FRAME_POINTER
+
 	/*
 	 * If the entry is from userspace, switch stacks and treat it as
 	 * a normal entry.
 	 */
-	testb	$3, CS-ORIG_RAX(%rsp)
+	testb	$3, CS(%rsp)
 	jnz	.Lfrom_usermode_switch_stack_\@
 
 	/* paranoid_entry returns GS information for paranoid_exit in EBX. */
@@ -481,11 +484,14 @@ SYM_CODE_START(\asmsym)
 	UNWIND_HINT_IRET_REGS
 	ASM_CLAC
 
+	PUSH_AND_CLEAR_REGS
+	ENCODE_FRAME_POINTER
+
 	/*
 	 * If the entry is from userspace, switch stacks and treat it as
 	 * a normal entry.
 	 */
-	testb	$3, CS-ORIG_RAX(%rsp)
+	testb	$3, CS(%rsp)
 	jnz	.Lfrom_usermode_switch_stack_\@
 
 	/*
@@ -543,6 +549,9 @@ SYM_CODE_START(\asmsym)
 	UNWIND_HINT_IRET_REGS offset=8
 	ASM_CLAC
 
+	PUSH_AND_CLEAR_REGS
+	ENCODE_FRAME_POINTER
+
 	/* paranoid_entry returns GS information for paranoid_exit in EBX. */
 	call	paranoid_entry
 	UNWIND_HINT_REGS
@@ -855,8 +864,6 @@ SYM_CODE_END(xen_failsafe_callback)
 SYM_CODE_START_LOCAL(paranoid_entry)
 	UNWIND_HINT_FUNC
 	cld
-	PUSH_AND_CLEAR_REGS save_ret=1
-	ENCODE_FRAME_POINTER 8
 
 	/*
 	 * Always stash CR3 in %r14.  This value will be restored,
@@ -1269,6 +1276,9 @@ end_repeat_nmi:
 	 */
 	pushq	$-1				/* ORIG_RAX: no syscall to restart */
 
+	PUSH_AND_CLEAR_REGS
+	ENCODE_FRAME_POINTER
+
 	/*
 	 * Use paranoid_entry to handle SWAPGS and CR3.
 	 */
-- 
2.19.1.6.gb485710b