add support to load ET_DYN elf

When compiled as PIE, executable can be loaded at any memory address.
Lately, OpenSBI switched to such behavior and spike was not able to load
it anymore. This patch add an additional load_offset parameter for
load_elf(). This load_offset value is passed as DRAM_BASE and used only
for ET_DYN elfs.

Signed-off-by: Clément Léger <cleger@rivosinc.com>

Require vector extension when attempting vxsat writes

Accidentally removed in c9468f6e.

See #1660.

vector: Not logging write of reduction instructions when vl = 0

zicflip: fix [ms]ret behavior

The spec says: "If vl=0, no operation is performed and the destination
register is not updated." in Section 14. Vector Reduction Operations.

The commit proposes setting the variable is_write to false when vl = 0,
which means not logging the write.

Based on Spec chapter 3.5
"An MRET or SRET instruction is used to return from a trap in M-mode or
S-mode, respectively. When executing an xRET instruction, if xPP holds
the value y, then ELP is set to the value of xPELP if yLPE is 1;
otherwise, it is set to NO_LP_EXPECTED; xPELP is set to NO_LP_EXPECTED."

The change follow the last statement after semicolon
"xPELP is set to NO_LP_EXPECTED"

Signed-off-by: Chih-Min Chao <chihmin.chao@sifive.com>

Implement mcontrol6.hit

Avoid using private headers, e.g., debug_defines.h, in triggers.h

Add mcontrol_common_t::set_hit()

Update CSR_MCONTROL6_HIT to CSR_MCONTROL6_HIT0

Include CSR_TINFO_VERSION* macros

Add Zawrs extension

Zfa: fix: fmaxm.q requires Q instead of D extension

Remove old P extension

Support per-device arguments and device factory reuse

As proposed in #1652, we made the following changes to MMIO device (factory)
plugin API, to mitigate current limitations and facilitate factory reuse.

- removed `sargs` from `device_factory_t`, and introduced a new type alias
  `device_factory_sargs_t` to capture `<device_factory_t *, sargs>` pairs,
  this is used to instantiate sim_t instances;
- changed the signature of `device_factory_t::generate_fdt` and
  `device_factory_t::parse_from_fdt` to take on an extra `sargs` argument,
  for instantiating devices with per-device arguments;
- made `device_factory_t` const and potentially resuable across multiple
  `sim_t` instances.

Smstateen: Ignore writes to read-only hstateen*[n] bits when mstateen*[n]=0

PLIC: Implement threshold masking

add hlvx pmp protect to fix issue 1557

Support Zicfiss (shadow stack access) with CFI extension v0.4.0

Make Zaamo + Zalrsc (Zba + Zbb + Zbs) imply A (B) in misa

Assert misa.B bit through --isa=...B...

The specification states that writes to read-only bits in a RW CSR are
ignored. The hstateen*[n] bits are read-only when mstateen*[n]=0. This
PR proposes ignoring writes to read-only hstateen*[n] bits when
mstateen*[n]=0 instead of writing the bits to 0.