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.
committed.
-mike
2011-06-22 Mike Frysinger <vap...@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.
--- libgloss/bfin/syscalls.c 22 Jun 2011 03:00:44 -0000 1.5
+++ libgloss/bfin/syscalls.c 22 Jun 2011 04:16:32 -0000
@@ -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;
}
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