From 7bb73c592a68b3ee7029bccf147c65d109d7f069 Mon Sep 17 00:00:00 2001
From: brooks <brooks@FreeBSD.org>
Date: Thu, 28 Jan 2016 22:57:09 +0000
Subject: MFC r294515:

Fix the implementations of PSEUDO_NOERROR and PSEUDO.

The PSEUDO* macros should not declare <syscall>, only _<syscall> and
__sys_<syscall>.  This was causing the interposing C wrappers to be
ignored due to link order.

Reviewed by:	kib
Obtained from:	CheriBSD (4e8e13c90fc6a80e1520de44a6864cfd78b3b56d)
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D4097
---
 lib/libc/mips/SYS.h | 28 +++++++++++++++++++++-------
 1 file changed, 21 insertions(+), 7 deletions(-)

(limited to 'lib/libc/mips')

diff --git a/lib/libc/mips/SYS.h b/lib/libc/mips/SYS.h
index 10205b8..ceb6812 100644
--- a/lib/libc/mips/SYS.h
+++ b/lib/libc/mips/SYS.h
@@ -100,13 +100,31 @@
  * Do a syscall that cannot fail (sync, get{p,u,g,eu,eg)id)
  */
 #define RSYSCALL_NOERROR(x)						\
-	PSEUDO_NOERROR(x)
+LEAF(__sys_ ## x);							\
+	.weak _C_LABEL(x);						\
+	_C_LABEL(x) = _C_LABEL(__CONCAT(__sys_,x));			\
+	.weak _C_LABEL(__CONCAT(_,x));					\
+	_C_LABEL(__CONCAT(_,x)) = _C_LABEL(__CONCAT(__sys_,x));		\
+	SYSTRAP(x);							\
+	j ra;								\
+END(__sys_ ## x)
 
 /*
  * Do a normal syscall.
  */
 #define RSYSCALL(x)							\
-	PSEUDO(x)
+LEAF(__sys_ ## x);							\
+	.weak _C_LABEL(x);						\
+	_C_LABEL(x) = _C_LABEL(__CONCAT(__sys_,x));			\
+	.weak _C_LABEL(__CONCAT(_,x));					\
+	_C_LABEL(__CONCAT(_,x)) = _C_LABEL(__CONCAT(__sys_,x));		\
+	PIC_PROLOGUE(__sys_ ## x);					\
+	SYSTRAP(x);							\
+	bne a3,zero,err;						\
+	PIC_RETURN();							\
+err:									\
+	PIC_TAILCALL(__cerror);						\
+END(__sys_ ## x)
 
 /*
  * Do a renamed or pseudo syscall (e.g., _exit()), where the entrypoint
@@ -114,18 +132,14 @@
  */
 #define PSEUDO_NOERROR(x)						\
 LEAF(__sys_ ## x);							\
-	.weak _C_LABEL(x);						\
-	_C_LABEL(x) = _C_LABEL(__CONCAT(__sys_,x));			\
 	.weak _C_LABEL(__CONCAT(_,x));					\
 	_C_LABEL(__CONCAT(_,x)) = _C_LABEL(__CONCAT(__sys_,x));		\
 	SYSTRAP(x);							\
 	j ra;								\
-	END(__sys_ ## x)
+END(__sys_ ## x)
 
 #define PSEUDO(x)							\
 LEAF(__sys_ ## x);							\
-	.weak _C_LABEL(x);						\
-	_C_LABEL(x) = _C_LABEL(__CONCAT(__sys_,x));			\
 	.weak _C_LABEL(__CONCAT(_,x));					\
 	_C_LABEL(__CONCAT(_,x)) = _C_LABEL(__CONCAT(__sys_,x));		\
 	PIC_PROLOGUE(__sys_ ## x);					\
-- 
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