vsetivli yields illegal instruction exception

[Maor545]

I have compiled spike (commit 00dfa28) and pk (commit 4f3debe) both current master branch.
I have configured --with-isa=RV64GCV and --with-arch=RV64GCV for compilation of spike and pk respectively.
I am using riscv64-unknown-elf-gcc (gd7cbcfe7c33) 15.0.0 20240605 (experimental)

I run the following command and get the output trapping on vsetivli instruction.
What is going on here? How do I make spike to execute the instruction normally?

_install/bin/spike --isa=rv64gcv -d pk hello
(spike)
core   0: 0x0000000000001000 (0x00000297) auipc   t0, 0x0
(spike)
core   0: 0x0000000000001004 (0x02028593) addi    a1, t0, 32
(spike)
core   0: 0x0000000000001008 (0xf1402573) csrr    a0, mhartid
(spike)
core   0: 0x000000000000100c (0x0182b283) ld      t0, 24(t0)
(spike)
core   0: 0x0000000000001010 (0x00028067) jr      t0
(spike)
core   0: >>>>  MEM_START
core   0: 0x0000000080000000 (0x1f80006f) j       pc + 0x1f8
(spike)
core   0: >>>>  do_reset
core   0: 0x00000000800001f8 (0x00000093) li      ra, 0
(spike)
core   0: 0x00000000800001fc (0x00000113) li      sp, 0
(spike)
core   0: 0x0000000080000200 (0x00000193) li      gp, 0
(spike)
core   0: 0x0000000080000204 (0x00000213) li      tp, 0
(spike)
core   0: 0x0000000080000208 (0x00000293) li      t0, 0
(spike)
core   0: 0x000000008000020c (0x00000313) li      t1, 0
(spike)
core   0: 0x0000000080000210 (0x00000393) li      t2, 0
(spike)
core   0: 0x0000000080000214 (0x00000413) li      s0, 0
(spike)
core   0: 0x0000000080000218 (0x00000493) li      s1, 0
(spike)
core   0: 0x000000008000021c (0x00000613) li      a2, 0
(spike)
core   0: 0x0000000080000220 (0x00000693) li      a3, 0
(spike)
core   0: 0x0000000080000224 (0x00000713) li      a4, 0
(spike)
core   0: 0x0000000080000228 (0x00000793) li      a5, 0
(spike)
core   0: 0x000000008000022c (0x00000813) li      a6, 0
(spike)
core   0: 0x0000000080000230 (0x00000893) li      a7, 0
(spike)
core   0: 0x0000000080000234 (0x00000913) li      s2, 0
(spike)
core   0: 0x0000000080000238 (0x00000993) li      s3, 0
(spike)
core   0: 0x000000008000023c (0x00000a13) li      s4, 0
(spike)
core   0: 0x0000000080000240 (0x00000a93) li      s5, 0
(spike)
core   0: 0x0000000080000244 (0x00000b13) li      s6, 0
(spike)
core   0: 0x0000000080000248 (0x00000b93) li      s7, 0
(spike)
core   0: 0x000000008000024c (0x00000c13) li      s8, 0
(spike)
core   0: 0x0000000080000250 (0x00000c93) li      s9, 0
(spike)
core   0: 0x0000000080000254 (0x00000d13) li      s10, 0
(spike)
core   0: 0x0000000080000258 (0x00000d93) li      s11, 0
(spike)
core   0: 0x000000008000025c (0x00000e13) li      t3, 0
(spike)
core   0: 0x0000000080000260 (0x00000e93) li      t4, 0
(spike)
core   0: 0x0000000080000264 (0x00000f13) li      t5, 0
(spike)
core   0: 0x0000000080000268 (0x00000f93) li      t6, 0
(spike)
core   0: 0x000000008000026c (0x34001073) csrw    mscratch, zero
(spike)
core   0: 0x0000000080000270 (0x00000297) auipc   t0, 0x0
(spike)
core   0: 0x0000000080000274 (0xd9428293) addi    t0, t0, -620
(spike)
core   0: 0x0000000080000278 (0x30529073) csrw    mtvec, t0
(spike)
core   0: 0x000000008000027c (0x30502373) csrr    t1, mtvec
(spike)
core   0: 0x0000000080000280 (0x00629063) bne     t0, t1, pc + 0
(spike)
core   0: 0x0000000080000284 (0x00012117) auipc   sp, 0x12
(spike)
core   0: 0x0000000080000288 (0xc3c10113) addi    sp, sp, -964
(spike)
core   0: 0x000000008000028c (0xf14026f3) csrr    a3, mhartid
(spike)
core   0: 0x0000000080000290 (0x00c69613) slli    a2, a3, 12
(spike)
core   0: 0x0000000080000294 (0x00c10133) add     sp, sp, a2
(spike)
core   0: 0x0000000080000298 (0x00069463) bnez    a3, pc + 8
(spike)
core   0: 0x000000008000029c (0x3da0306f) j       pc + 0x33da
(spike)
core   0: >>>>  init_first_hart
core   0: 0x0000000080003676 (0x00007179) c.addi16sp sp, -48
(spike)
core   0: 0x0000000080003678 (0x0000852e) c.mv    a0, a1
(spike)
core   0: 0x000000008000367a (0x0000f406) c.sdsp  ra, 40(sp)
(spike)
core   0: 0x000000008000367c (0x0000f022) c.sdsp  s0, 32(sp)
(spike)
core   0: 0x000000008000367e (0x0000ec26) c.sdsp  s1, 24(sp)
(spike)
core   0: 0x0000000080003680 (0x00001800) c.addi4spn s0, sp, 48
(spike)
core   0: 0x0000000080003682 (0x0000e84a) c.sdsp  s2, 16(sp)
(spike)
core   0: 0x0000000080003684 (0x0000e44e) c.sdsp  s3, 8(sp)
(spike)
core   0: 0x0000000080003686 (0x000084ae) c.mv    s1, a1
(spike)
core   0: 0x0000000080003688 (0x5fc000ef) jal     pc + 0x5fc
(spike)
core   0: >>>>  query_uart
core   0: 0x0000000080003c84 (0xcc747057) vsetivli zero, 8, e8, mf2, ta, ma
core   0: exception trap_illegal_instruction, epc 0x0000000080003c84
core   0:           tval 0x00000000cc747057

edit, I have tried running pk in sail and it fails too, so I assume the PK sets illegal vtype? can someone confirm

[chihminchao]

Do you enable the vector part by setting mstatus.vs ?

[Maor545]

Thank you for the hint, I will investigate why pk and gcc does not set mstatus.vs before using RVV

[Maor545]

This seems to be caused by GCC v15 and vector calling convention
opened issue in PK project
riscv-software-src/riscv-pk#330