libaio: Fix MIPS system call interface

The io_syscallX wrappers in syscall-mips.h discard error return status
by overwriting the value returned in v0 from the system call with -1.

Modify this behavior by returning the negative of the return value on
error (as identified by a3 != 0). This convention is consistent with
the behavior observed in syscall-ppc.h.

For a description of the MIPS system call interface, see:

http://www.linux-mips.org/wiki/Syscall

(From OE-Core rev: 0d8f50c33e5ff71dc17121b5c293718a8ad602bd)

Signed-off-by: Phil Staub <Phil.Staub@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 62 insertions, 0 deletions

diff --git a/meta/recipes-extended/libaio/libaio/libaio_fix_for_mips_syscalls.patch b/meta/recipes-extended/libaio/libaio/libaio_fix_for_mips_syscalls.patch
new file mode 100644
index 0000000000..022276af83
--- /dev/null
+++ b/meta/recipes-extended/libaio/libaio/libaio_fix_for_mips_syscalls.patch
@@ -0,0 +1,62 @@
+Upstream status: Inappropriate [embedded specific]
+
+Signed-off-by: Phil Staub <Phil.Staub@windriver.com>
+
+Index: libaio-0.3.109/src/syscall-mips.h
+===================================================================
+--- libaio-0.3.109.orig/src/syscall-mips.h
++++ libaio-0.3.109/src/syscall-mips.h
+@@ -76,7 +76,7 @@ type fname(atype a) \
+        \
+        if (__a3 == 0) \
+                return (type) __v0; \
+-       return (type) -1; \
++       return (type) (-(__v0)); \
+ }
+ 
+ #define io_syscall2(type,fname,sname,atype,a,btype,b) \
+@@ -100,7 +100,7 @@ type fname(atype a, btype b) \
+        \
+        if (__a3 == 0) \
+                return (type) __v0; \
+-       return (type) -1; \
++       return (type) (-(__v0)); \
+ }
+ 
+ #define io_syscall3(type,fname,sname,atype,a,btype,b,ctype,c) \
+@@ -125,7 +125,7 @@ type fname(atype a, btype b, ctype c) \
+        \
+        if (__a3 == 0) \
+                return (type) __v0; \
+-       return (type) -1; \
++       return (type) (-(__v0)); \
+ }
+ 
+ #define io_syscall4(type,fname,sname,atype,a,btype,b,ctype,c,dtype,d) \
+@@ -150,7 +150,7 @@ type fname(atype a, btype b, ctype c, dt
+        \
+        if (__a3 == 0) \
+                return (type) __v0; \
+-       return (type) -1; \
++       return (type) (-(__v0)); \
+ }
+ 
+ #if (_MIPS_SIM == _MIPS_SIM_ABI32)
+@@ -186,7 +186,7 @@ type fname(atype a, btype b, ctype c, dt
+        \
+        if (__a3 == 0) \
+                return (type) __v0; \
+-       return (type) -1; \
++       return (type) (-(__v0)); \
+ }
+ 
+ #endif /* (_MIPS_SIM == _MIPS_SIM_ABI32) */
+@@ -216,7 +216,7 @@ type fname (atype a,btype b,ctype c,dtyp
+        \
+        if (__a3 == 0) \
+                return (type) __v0; \
+-       return (type) -1; \
++       return (type) (-(__v0)); \
+ }
+ 
+ #endif /* (_MIPS_SIM == _MIPS_SIM_NABI32) || (_MIPS_SIM == _MIPS_SIM_ABI64) */