Commit 0e141977 authored by Richard Henderson's avatar Richard Henderson
Browse files

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: default avatarRichard Henderson <rth@twiddle.net>
parent e7ea6cbe

linux-user/main.c

+5 −7
Original line number Diff line number Diff line
@@ -2846,13 +2846,11 @@ void cpu_loop(CPUAlphaState *env) 
                    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 */