i#3544 RV64: Refine fault translation and signal handling

[ksco]

Refine fault translation and signal handling, part of the linux.signalXXXX tests works on real hardware; however, they do not work on QEMU, so we can't enable them on CI.

Issue: #3544

[ksco]

QEMU does not work well with drrun on signal tests for some unknown reason. Running qemu-riscv64 -L /usr/riscv64-linux-gnu bin64/drrun -debug -xarch_root /usr/riscv64-linux-gnu -- suite/tests/bin/linux.signal0000 results following error while it works fine on real hardware.

Sending SIGUSR2
Sending SIGUSR1
<Application /root/dynamorio/build/suite/tests/bin/linux.signal0000 (32907).  DynamoRIO internal crash at PC 0x0000000071235c78.  Please report this at http://dynamorio.org/issues/.  Program aborted.
Received SIGSEGV at pc 0x0000000071235c78 in thread 32907
Base: 0x0000000071000000
Registers:  pc=0x0000000071235c78 ra=0x000000007120e3f0 sp =0x0000004004ad8730 gp =0x0000004000809948
        tp=0x0000004004aab7a0 t0=0x00000000000878b0 t1 =0x0000004004acc378 t2 =0x0000000000000000
        s0=0x0000004004ad8760 s1=0x0000000000000001 a0 =0x0000004004acc038 a1 =0x0000004004ad9000
        a2=0x0000000000000110 a3=0x0000000000000000 a4 =0x0000004004ad8cc0 a5 =0x0000004004acc488
        a6=0x0000000000000000 a7=0x0000000000000081 s2 =0x0000000000000000 s3 =0x0000004000808de8
        s4=0x000000400080684a s5=0x00000040008000b8 s6 =0x0000004000808de8 s7 =0x0000004004a13d18
        s8=0x0000004004a14050 s9=0x0000000000000000 s10=0x0000000000000000 s11=0x0000000000000000
        t3=0x0000004004aa8000 t4=0x000000000000eec0 t5 =0x0000000000000004 t6 =0xffffffffffffffff

version 10.0.19678, custom build

[ksco]

vs2019-64 looks like #6423, but there is one more test failed: code_api|tool.drcacheoff.burst_replaceall.
x86-32-ubuntu22 #6416
x86-32 #6417

[ksco]

@derekbruening Could you merge this? Thanks.

[derekbruening]

Seems like x86-32 is hitting an AMD machine every time now. People are trying to fix the #6417 failures but there a multiple of them...

[ksco]

Yeah, I understand that. Thank you for the effort!