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linux-user: Support for restarting system calls for UniCore32 targets 

Update the UniCore32 main loop code:
 * on TARGET_ERESTARTSYS, wind guest PC backwards to repeat syscall insn
 * handle TARGET_QEMU_ESIGRETURN in the main loop as the indication
   that the main loop should not touch any guest CPU state

(We don't support signals on this target so there is no sigreturn code
to update.)

Signed-off-by: Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk>
Message-id: 1441497448-32489-30-git-send-email-T.E.Baldwin99@members.leeds.ac.uk
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
[PMM: tweak commit message; drop TARGET_USE_ERESTARTSYS define]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Timothy E Baldwin 2016-05-12 18:47:37 +01:00 committed by Riku Voipio
parent 338c858c94
commit 256cb6af7f
1 changed files with 6 additions and 1 deletions
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7
linux-user/main.c
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@ -1171,7 +1171,7 @@ void cpu_loop(CPUUniCore32State *env)
cpu_set_tls(env, env->regs[0]);
env->regs[0] = 0;
} else {
env->regs[0] = do_syscall(env,
abi_long ret = do_syscall(env,
n,
env->regs[0],
env->regs[1],
@ -1180,6 +1180,11 @@ void cpu_loop(CPUUniCore32State *env)
env->regs[4],
env->regs[5],
0, 0);
if (ret == -TARGET_ERESTARTSYS) {
env->regs[31] -= 4;
} else if (ret != -TARGET_QEMU_ESIGRETURN) {
env->regs[0] = ret;
}
}
} else {
goto error;