Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20211102' into staging

- Split out host signal handing from accel/tcg/user-exec.c
  to linux-user/host/arch/host-signal.h
- Replace TCGCPUOps.tlb_fill with TCGCPUOps.record_sigsegv for user-only
- Add TCGCPUOps.record_sigbus for user-only
- Remove a lot of target-specific cpu_loop handling for signals,
  now accomplished with generic code.

# gpg: Signature made Tue 02 Nov 2021 07:06:14 AM EDT
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg:                issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [ultimate]

* remotes/rth/tags/pull-tcg-20211102: (60 commits)
  linux-user: Handle BUS_ADRALN in host_signal_handler
  tcg: Add helper_unaligned_{ld,st} for user-only sigbus
  accel/tcg: Report unaligned load/store for user-only
  accel/tcg: Report unaligned atomics for user-only
  target/sparc: Set fault address in sparc_cpu_do_unaligned_access
  target/sparc: Split out build_sfsr
  target/sparc: Remove DEBUG_UNALIGNED
  target/sh4: Set fault address in superh_cpu_do_unaligned_access
  target/s390x: Implement s390x_cpu_record_sigbus
  linux-user/ppc: Remove POWERPC_EXCP_ALIGN handling
  target/ppc: Restrict ppc_cpu_do_unaligned_access to sysemu
  target/ppc: Set fault address in ppc_cpu_do_unaligned_access
  target/ppc: Move SPR_DSISR setting to powerpc_excp
  target/microblaze: Do not set MO_ALIGN for user-only
  linux-user/hppa: Remove EXCP_UNALIGN handling
  target/arm: Implement arm_cpu_record_sigbus
  target/alpha: Implement alpha_cpu_record_sigbus
  linux-user: Add cpu_loop_exit_sigbus
  hw/core: Add TCGCPUOps.record_sigbus
  accel/tcg: Restrict TCGCPUOps::tlb_fill() to sysemu
  ...

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

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