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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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2
linux-user/signal.c
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@ -5709,7 +5709,7 @@ long do_rt_sigreturn(CPUTLGState *env)
}
unlock_user_struct(frame, frame_addr, 0);
return env->regs[TILEGX_R_RE];
return -TARGET_QEMU_ESIGRETURN;
badframe: