libgloss: bfin: handle result2/errcode in sim syscalls

The sim passes back results via two values, and the error code via a 3rd.
make sure libgloss extracts all three so that things like errno work as
expected.  This fixes many gdb tests which look for this sort of thing.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/libgloss/ChangeLog b/libgloss/ChangeLog
index a6f7ef6..433f126 100644 (file)
--- a/libgloss/ChangeLog
+++ b/libgloss/ChangeLog
@@ -1,3 +1,11 @@
+2011-06-22  Mike Frysinger  <vapier@gentoo.org>
+
+       * bfin/syscalls.c (do_syscall): Delete local variable definitions.
+       Declare result, result2, errcode local ints.  Delete asm inputs
+       and outputs.  Set output constraints to q0/result, q1/result2, and
+       q2/errcode.  Set input constraints to qA/reason and q0/arg.  Set
+       errno to errcode.
+
 2011-06-21  Mike Frysinger  <vapier@gentoo.org>
 
        * bfin/syscalls.c: Trim trailing whitespace.

diff --git a/libgloss/bfin/syscalls.c b/libgloss/bfin/syscalls.c
index b9a5f58..03765bf 100644 (file)
--- a/libgloss/bfin/syscalls.c
+++ b/libgloss/bfin/syscalls.c
@@ -32,10 +32,15 @@ register char *stack_ptr asm ("SP");
 static inline int
 do_syscall (int reason, void *arg)
 {
-  register int r asm ("P0") = reason;
-  register void *a asm ("R0") = arg;
-  register int result asm ("R0");
-  asm volatile ("excpt 0;" : "=r" (result) : "a" (r), "r" (a) : "memory", "CC");
+  int result, result2, errcode;
+  asm volatile ("excpt 0;"
+               : "=q0" (result),
+                 "=q1" (result2),
+                 "=q2" (errcode)
+               : "qA" (reason),
+                 "q0" (arg)
+               : "memory", "CC");
+  errno = errcode;
   return result;
 }