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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>
This commit is contained in:
Richard Henderson 2012-06-07 14:47:41 -07:00
parent e7ea6cbefd
commit 0e141977e6
1 changed files with 5 additions and 7 deletions
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12
linux-user/main.c
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@ -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 */