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

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Update the 32-bit and 64-bit ARM 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: 1441497448-32489-6-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 18:47:31 +01:00 • committed by Riku Voipio
parent 0284b03ba3
commit f0267ef711
3 changed files with 36 additions and 23 deletions
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10
linux-user/signal.c
View file

@ -1390,7 +1390,7 @@ long do_rt_sigreturn(CPUARMState *env)
}
unlock_user_struct(frame, frame_addr, 0);
return env->xregs[0];
return -TARGET_QEMU_ESIGRETURN;
badframe:
unlock_user_struct(frame, frame_addr, 0);
@ -1902,7 +1902,7 @@ static long do_sigreturn_v1(CPUARMState *env)
send_sig(SIGTRAP, current, 1);
#endif
unlock_user_struct(frame, frame_addr, 0);
return env->regs[0];
return -TARGET_QEMU_ESIGRETURN;
badframe:
force_sig(TARGET_SIGSEGV /* , current */);
@ -2028,7 +2028,7 @@ static long do_sigreturn_v2(CPUARMState *env)
}
unlock_user_struct(frame, frame_addr, 0);
return env->regs[0];
return -TARGET_QEMU_ESIGRETURN;
badframe:
unlock_user_struct(frame, frame_addr, 0);
@ -2082,7 +2082,7 @@ static long do_rt_sigreturn_v1(CPUARMState *env)
send_sig(SIGTRAP, current, 1);
#endif
unlock_user_struct(frame, frame_addr, 0);
return env->regs[0];
return -TARGET_QEMU_ESIGRETURN;
badframe:
unlock_user_struct(frame, frame_addr, 0);
@ -2115,7 +2115,7 @@ static long do_rt_sigreturn_v2(CPUARMState *env)
}
unlock_user_struct(frame, frame_addr, 0);
return env->regs[0];
return -TARGET_QEMU_ESIGRETURN;
badframe:
unlock_user_struct(frame, frame_addr, 0);