alpha-linux-user: Fix a3 error return with v0 error bypass.
We were failing to initialize a3 for syscalls that bypass the
negative return value error check.
Signed-off-by: Richard Henderson <rth@twiddle.net>
diff --git a/linux-user/main.c b/linux-user/main.c
index a21942c..53714de 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -2846,13 +2846,11 @@
break;
}
/* Syscall writes 0 to V0 to bypass error check, similar
- to how this is handled internal to Linux kernel. */
- if (env->ir[IR_V0] == 0) {
- env->ir[IR_V0] = sysret;
- } else {
- env->ir[IR_V0] = (sysret < 0 ? -sysret : sysret);
- env->ir[IR_A3] = (sysret < 0);
- }
+ to how this is handled internal to Linux kernel.
+ (Ab)use trapnr temporarily as boolean indicating error. */
+ trapnr = (env->ir[IR_V0] != 0 && sysret < 0);
+ env->ir[IR_V0] = (trapnr ? -sysret : sysret);
+ env->ir[IR_A3] = trapnr;
break;
case 0x86:
/* IMB */