linux-kernel - [PATCH] x86/asm/entry/32: Rename labels in INT 0x80 code path

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Date:	Sun,  7 Jun 2015 20:41:54 +0200
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...capital.net>,
	Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] x86/asm/entry/32: Rename labels in INT 0x80 code path

"ia32_syscall"  label name (entry point for INT 80) is inconsistent with
"ia32_sysenter_target" (entry point for SYSENTER insn) and
"ia32_cstar_target" (entry point for SYSCALL insn).

It is especially misleading since we do have code in this file which
handles SYSCALL insn, and it's _not this code_.

Rename it to ia32_int80_target. Rename all internal labels in ia32_int80_target
routine to int80_<foo> form, similar to the convention in SYSENTER and SYSCALL
code blocks.

Not renaming ia32_cstar_target: even though "ia32_syscall_target" would make
a bit more sense, it's less greppable: "syscall" is a very common string.

Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
CC: Linus Torvalds <torvalds@...ux-foundation.org>
CC: Steven Rostedt <rostedt@...dmis.org>
CC: Ingo Molnar <mingo@...nel.org>
CC: Borislav Petkov <bp@...en8.de>
CC: "H. Peter Anvin" <hpa@...or.com>
CC: Andy Lutomirski <luto@...capital.net>
CC: Oleg Nesterov <oleg@...hat.com>
CC: Frederic Weisbecker <fweisbec@...il.com>
CC: Alexei Starovoitov <ast@...mgrid.com>
CC: Will Drewry <wad@...omium.org>
CC: Kees Cook <keescook@...omium.org>
CC: x86@...nel.org
CC: linux-kernel@...r.kernel.org
---
 arch/x86/entry/entry_64_compat.S | 12 ++++++------
 arch/x86/include/asm/proto.h     |  2 +-
 arch/x86/kernel/traps.c          |  2 +-
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S
index b80f8d4..744a3f7 100644
--- a/arch/x86/entry/entry_64_compat.S
+++ b/arch/x86/entry/entry_64_compat.S
@@ -443,7 +443,7 @@ ia32_ret_from_sys_call:
  * Assumes it is only called from user space and entered with interrupts off.
  */
 
-ENTRY(ia32_syscall)
+ENTRY(ia32_int80_target)
 	/*
 	 * Interrupts are off on entry.
 	 * We do not frame this tiny irq-off block with TRACE_IRQS_OFF/ON,
@@ -472,9 +472,9 @@ ENTRY(ia32_syscall)
 
 	orl	$TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS)
 	testl	$_TIF_WORK_SYSCALL_ENTRY, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
-	jnz	ia32_tracesys
+	jnz	int80_tracesys
 
-ia32_do_call:
+int80_do_call:
 	/* 32-bit syscall -> 64-bit C ABI argument conversion */
 	movl	%edi, %r8d		/* arg5 */
 	movl	%ebp, %r9d		/* arg6 */
@@ -489,7 +489,7 @@ ia32_do_call:
 1:
 	jmp	int_ret_from_sys_call
 
-ia32_tracesys:
+int80_tracesys:
 	SAVE_EXTRA_REGS
 	movq	%rsp, %rdi			/* &pt_regs -> arg1 */
 	call	syscall_trace_enter
@@ -506,8 +506,8 @@ ia32_tracesys:
 	movl	RDI(%rsp), %edi
 	movl	%eax, %eax		/* zero extension */
 	RESTORE_EXTRA_REGS
-	jmp	ia32_do_call
-END(ia32_syscall)
+	jmp	int80_do_call
+END(ia32_int80_target)
 
 	.macro PTREGSCALL label, func
 	ALIGN
diff --git a/arch/x86/include/asm/proto.h b/arch/x86/include/asm/proto.h
index a90f897..3c692be 100644
--- a/arch/x86/include/asm/proto.h
+++ b/arch/x86/include/asm/proto.h
@@ -8,7 +8,7 @@
 void system_call(void);
 void syscall_init(void);
 
-void ia32_syscall(void);
+void ia32_int80_target(void);
 void ia32_cstar_target(void);
 void ia32_sysenter_target(void);
 
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index b5e7687..b8a4204 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -894,7 +894,7 @@ void __init trap_init(void)
 		set_bit(i, used_vectors);
 
 #ifdef CONFIG_IA32_EMULATION
-	set_system_intr_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
+	set_system_intr_gate(IA32_SYSCALL_VECTOR, ia32_int80_target);
 	set_bit(IA32_SYSCALL_VECTOR, used_vectors);
 #endif
 
-- 
1.8.1.4

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