[PATCH] alpha: fix linux syscall convention
According to linux kernel sources, register a3 is set in case of failure
(and cleared in case of success) while register v0 contains the result
(or -errno in case of error).
The convention was not followed which results in weird behaviour.
Signed-off-by: Tristan Gingold <gingold@adacore.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5243 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/hw/alpha_palcode.c b/hw/alpha_palcode.c
index fe14c10..38466db 100644
--- a/hw/alpha_palcode.c
+++ b/hw/alpha_palcode.c
@@ -1071,11 +1071,12 @@
ret = do_syscall(env, env->ir[IR_V0], env->ir[IR_A0], env->ir[IR_A1],
env->ir[IR_A2], env->ir[IR_A3], env->ir[IR_A4],
env->ir[IR_A5]);
- env->ir[IR_A3] = ret;
- if (ret > (target_ulong)(-515)) {
- env->ir[IR_V0] = 1;
+ if (ret >= 0) {
+ env->ir[IR_A3] = 0;
+ env->ir[IR_V0] = ret;
} else {
- env->ir[IR_V0] = 0;
+ env->ir[IR_A3] = 1;
+ env->ir[IR_V0] = -ret;
}
break;
case 0x9E:
