linux-kernel - [PATCH] x86-64: Use normal ptregs stub for execve

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Message-Id: <1264434453-2204-1-git-send-email-brgerst@gmail.com>
Date:	Mon, 25 Jan 2010 10:47:33 -0500
From:	Brian Gerst <brgerst@...il.com>
To:	hpa@...or.com
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] x86-64: Use normal ptregs stub for execve

Execve historically passed regs by value, so it had a seperate stub.
This is no longer true, so change it to use a normal PTREGSCALL stub.

Signed-off-by: Brian Gerst <brgerst@...il.com>
---
 arch/x86/kernel/entry_64.S |   17 +----------------
 1 files changed, 1 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 0697ff1..0c31502 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -696,6 +696,7 @@ END(\label)
 	PTREGSCALL stub_clone, sys_clone, %r8
 	PTREGSCALL stub_fork, sys_fork, %rdi
 	PTREGSCALL stub_vfork, sys_vfork, %rdi
+	PTREGSCALL stub_execve, sys_execve, %rcx
 	PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx
 	PTREGSCALL stub_iopl, sys_iopl, %rsi
 
@@ -712,22 +713,6 @@ ENTRY(ptregscall_common)
 	CFI_ENDPROC
 END(ptregscall_common)
 
-ENTRY(stub_execve)
-	CFI_STARTPROC
-	popq %r11
-	CFI_ADJUST_CFA_OFFSET -8
-	CFI_REGISTER rip, r11
-	SAVE_REST
-	FIXUP_TOP_OF_STACK %r11
-	movq %rsp, %rcx
-	call sys_execve
-	RESTORE_TOP_OF_STACK %r11
-	movq %rax,RAX(%rsp)
-	RESTORE_REST
-	jmp int_ret_from_sys_call
-	CFI_ENDPROC
-END(stub_execve)
-
 /*
  * sigreturn is special because it needs to restore all registers on return.
  * This cannot be done with SYSRET, so use the IRET return path instead.
-- 
1.6.6

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