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linux-user: Support for restarting system calls for SH4 targets

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Update the SH4 main loop and sigreturn code:
 * on TARGET_ERESTARTSYS, wind guest PC backwards to repeat syscall insn
 * set all guest CPU state within signal.c code on sigreturn
 * handle TARGET_QEMU_ESIGRETURN in the main loop as the indication
   that the main loop should not touch any guest CPU state

Signed-off-by: Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk>
Message-id: 1441497448-32489-12-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 18:47:35 +01:00 • committed by Riku Voipio
parent c0bea68f9e
commit ba41249678
3 changed files with 12 additions and 11 deletions
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6
linux-user/main.c
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@ -2826,7 +2826,11 @@ void cpu_loop(CPUSH4State *env)
env->gregs[0],
env->gregs[1],
0, 0);
env->gregs[0] = ret;
if (ret == -TARGET_ERESTARTSYS) {
env->pc -= 2;
} else if (ret != -TARGET_QEMU_ESIGRETURN) {
env->gregs[0] = ret;
}
break;
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */