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

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Update the tilegx main loop and sigreturn code:
 * on TARGET_ERESTARTSYS, wind guest PC backwards to repeat syscall insn
 * return -TARGET_QEMU_ESIGRETURN from sigreturn rather than current R_RE
 * handle TARGET_QEMU_ESIGRETURN in the main loop as the indication
   that the main loop should not touch any guest CPU state

Note that this fixes a bug where a sigreturn which happened to have
an errno value in TILEGX_R_RE would incorrectly cause TILEGX_R_ERR
to get set.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Peter Maydell 2016-05-12 18:47:42 +01:00 • committed by Riku Voipio
parent 6205086558
commit a9175169cc
3 changed files with 15 additions and 9 deletions
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1
linux-user/tilegx/target_signal.h
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@ -25,4 +25,5 @@ static inline abi_ulong get_sp_from_cpustate(CPUTLGState *state)
return state->regs[TILEGX_R_SP];
}
#endif /* TARGET_SIGNAL_H */