Merge tag 'pull-nios2-20220426' of https://gitlab.com/rth7680/qemu into staging

Fix nios2-linux-user syscalls.
Fix nios2-linux-user sigreturn.
Enable tests for nios2-linux-user.
Remove special handling of SIGSEGV.
Check supervisor for eret, bret.
Split special registers out of env->regs[].
Clean up interrupt processing.
Raise unaligned data and destination exceptions.
Set TLBMISC fields correctly on exceptions.
Prevent writes to read-only or reserved control fields.
Use tcg_constant_tl().
Implement shadow register sets.
Implement external interrupt controller interface.
Implement vectored interrupt controller.
Enable semihosting tests for nios2-softmmu.

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* tag 'pull-nios2-20220426' of https://gitlab.com/rth7680/qemu: (68 commits)
  tests/tcg/nios2: Add test-shadow-1
  tests/tcg/nios2: Add semihosting multiarch tests
  hw/nios2: Machine with a Vectored Interrupt Controller
  hw/nios2: Move memory regions into Nios2Machine
  hw/nios2: Introduce Nios2MachineState
  hw/intc: Vectored Interrupt Controller (VIC)
  linux-user/nios2: Handle various SIGILL exceptions
  target/nios2: Advance pc when raising exceptions
  target/nios2: Implement EIC interrupt processing
  target/nios2: Update helper_eret for shadow registers
  target/nios2: Implement rdprs, wrprs
  target/nios2: Introduce shadow register sets
  target/nios2: Implement Misaligned destination exception
  target/nios2: Use tcg_gen_lookup_and_goto_ptr
  target/nios2: Use gen_goto_tb for DISAS_TOO_MANY
  target/nios2: Hoist set of is_jmp into gen_goto_tb
  target/nios2: Create gen_jumpr
  target/nios2: Enable unaligned traps for system mode
  target/nios2: Drop CR_STATUS_EH from tb->flags
  target/nios2: Introduce dest_gpr
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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