trap_illegal_instruction and trap_instruction_access_fault when running program

[arnstein]

After running make and compiling some programs for RISCV and trying to run them, I get errors. When running these programs on the linux kernel through spike, I get the trap_illegal_instruction and trap_instruction_access_fault, and the programs stop working. I am running spike with -p2 processors.

The instructions that result in trap_illegal_instruction are:
csrr
fsd
fld

When the second core, core 1, starts running, it runs for a bit, then does the mret instruction, and immediately after this it gets stuck on the trap_instruction_access_fault exception. The full error is:
core 1: exception trap_instruction_access_fault, epc 0x0000000000000000
core 1: badaddr 0x0000000000000000

It continues like this until I CTRL+C.
Any ideas how to fix this? I would like to get some memory traces from a shared memory program, to be able to test a cache coherence protocol I am designing for a computer with a RISCV core.

[palmer-dabbelt]

This should be fixed on master now (we were missing an FPU in the FPGA image).