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/*=======================================================================================*/
/* RISCV Sail Model */
/* */
/* This Sail RISC-V architecture model, comprising all files and */
/* directories except for the snapshots of the Lem and Sail libraries */
/* in the prover_snapshots directory (which include copies of their */
/* licences), is subject to the BSD two-clause licence below. */
/* */
/* Copyright (c) 2017-2023 */
/* Prashanth Mundkur */
/* Rishiyur S. Nikhil and Bluespec, Inc. */
/* Jon French */
/* Brian Campbell */
/* Robert Norton-Wright */
/* Alasdair Armstrong */
/* Thomas Bauereiss */
/* Shaked Flur */
/* Christopher Pulte */
/* Peter Sewell */
/* Alexander Richardson */
/* Hesham Almatary */
/* Jessica Clarke */
/* Microsoft, for contributions by Robert Norton-Wright and Nathaniel Wesley Filardo */
/* Peter Rugg */
/* Aril Computer Corp., for contributions by Scott Johnson */
/* Philipp Tomsich */
/* VRULL GmbH, for contributions by its employees */
/* */
/* All rights reserved. */
/* */
/* This software was developed by the above within the Rigorous */
/* Engineering of Mainstream Systems (REMS) project, partly funded by */
/* EPSRC grant EP/K008528/1, at the Universities of Cambridge and */
/* Edinburgh. */
/* */
/* This software was developed by SRI International and the University of */
/* Cambridge Computer Laboratory (Department of Computer Science and */
/* Technology) under DARPA/AFRL contract FA8650-18-C-7809 ("CIFV"), and */
/* under DARPA contract HR0011-18-C-0016 ("ECATS") as part of the DARPA */
/* SSITH research programme. */
/* */
/* This project has received funding from the European Research Council */
/* (ERC) under the European Union’s Horizon 2020 research and innovation */
/* programme (grant agreement 789108, ELVER). */
/* */
/* */
/* Redistribution and use in source and binary forms, with or without */
/* modification, are permitted provided that the following conditions */
/* are met: */
/* 1. Redistributions of source code must retain the above copyright */
/* notice, this list of conditions and the following disclaimer. */
/* 2. Redistributions in binary form must reproduce the above copyright */
/* notice, this list of conditions and the following disclaimer in */
/* the documentation and/or other materials provided with the */
/* distribution. */
/* */
/* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' */
/* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED */
/* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A */
/* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR */
/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
/* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF */
/* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND */
/* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, */
/* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT */
/* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF */
/* SUCH DAMAGE. */
/*=======================================================================================*/
/* program counter */
register PC : xlenbits
register nextPC : xlenbits
/* internal state to hold instruction bits for faulting instructions */
register instbits : xlenbits
/* register file and accessors */
register x1 : regtype
register x2 : regtype
register x3 : regtype
register x4 : regtype
register x5 : regtype
register x6 : regtype
register x7 : regtype
register x8 : regtype
register x9 : regtype
register x10 : regtype
register x11 : regtype
register x12 : regtype
register x13 : regtype
register x14 : regtype
register x15 : regtype
register x16 : regtype
register x17 : regtype
register x18 : regtype
register x19 : regtype
register x20 : regtype
register x21 : regtype
register x22 : regtype
register x23 : regtype
register x24 : regtype
register x25 : regtype
register x26 : regtype
register x27 : regtype
register x28 : regtype
register x29 : regtype
register x30 : regtype
register x31 : regtype
val rX : forall 'n, 0 <= 'n < 32. regno('n) -> xlenbits
function rX r = {
let v : regtype =
match r {
0 => zero_reg,
1 => x1,
2 => x2,
3 => x3,
4 => x4,
5 => x5,
6 => x6,
7 => x7,
8 => x8,
9 => x9,
10 => x10,
11 => x11,
12 => x12,
13 => x13,
14 => x14,
15 => x15,
16 => x16,
17 => x17,
18 => x18,
19 => x19,
20 => x20,
21 => x21,
22 => x22,
23 => x23,
24 => x24,
25 => x25,
26 => x26,
27 => x27,
28 => x28,
29 => x29,
30 => x30,
31 => x31,
_ => {assert(false, "invalid register number"); zero_reg}
};
regval_from_reg(v)
}
$ifdef RVFI_DII
val rvfi_wX : forall 'n, 0 <= 'n < 32. (regno('n), xlenbits) -> unit
function rvfi_wX (r,v) = {
rvfi_int_data->rvfi_rd_wdata() = zero_extend(v);
rvfi_int_data->rvfi_rd_addr() = to_bits(8,r);
rvfi_int_data_present = true;
}
$else
val rvfi_wX : forall 'n, 0 <= 'n < 32. (regno('n), xlenbits) -> unit
function rvfi_wX (r,v) = ()
$endif
val wX : forall 'n, 0 <= 'n < 32. (regno('n), xlenbits) -> unit
function wX (r, in_v) = {
let v = regval_into_reg(in_v);
match r {
0 => (),
1 => x1 = v,
2 => x2 = v,
3 => x3 = v,
4 => x4 = v,
5 => x5 = v,
6 => x6 = v,
7 => x7 = v,
8 => x8 = v,
9 => x9 = v,
10 => x10 = v,
11 => x11 = v,
12 => x12 = v,
13 => x13 = v,
14 => x14 = v,
15 => x15 = v,
16 => x16 = v,
17 => x17 = v,
18 => x18 = v,
19 => x19 = v,
20 => x20 = v,
21 => x21 = v,
22 => x22 = v,
23 => x23 = v,
24 => x24 = v,
25 => x25 = v,
26 => x26 = v,
27 => x27 = v,
28 => x28 = v,
29 => x29 = v,
30 => x30 = v,
31 => x31 = v,
_ => assert(false, "invalid register number")
};
if (r != 0) then {
rvfi_wX(r, in_v);
if get_config_print_reg()
then print_reg("x" ^ string_of_int(r) ^ " <- " ^ RegStr(v));
}
}
function rX_bits(i: bits(5)) -> xlenbits = rX(unsigned(i))
function wX_bits(i: bits(5), data: xlenbits) -> unit = {
wX(unsigned(i)) = data
}
overload X = {rX_bits, wX_bits, rX, wX}
/* register names */
val reg_name_abi : regidx -> string
function reg_name_abi(r) = {
match (r) {
0b00000 => "zero",
0b00001 => "ra",
0b00010 => "sp",
0b00011 => "gp",
0b00100 => "tp",
0b00101 => "t0",
0b00110 => "t1",
0b00111 => "t2",
0b01000 => "fp",
0b01001 => "s1",
0b01010 => "a0",
0b01011 => "a1",
0b01100 => "a2",
0b01101 => "a3",
0b01110 => "a4",
0b01111 => "a5",
0b10000 => "a6",
0b10001 => "a7",
0b10010 => "s2",
0b10011 => "s3",
0b10100 => "s4",
0b10101 => "s5",
0b10110 => "s6",
0b10111 => "s7",
0b11000 => "s8",
0b11001 => "s9",
0b11010 => "s10",
0b11011 => "s11",
0b11100 => "t3",
0b11101 => "t4",
0b11110 => "t5",
0b11111 => "t6"
}
}
overload to_str = {reg_name_abi}
/* mappings for assembly */
val reg_name : bits(5) <-> string
mapping reg_name = {
0b00000 <-> "zero",
0b00001 <-> "ra",
0b00010 <-> "sp",
0b00011 <-> "gp",
0b00100 <-> "tp",
0b00101 <-> "t0",
0b00110 <-> "t1",
0b00111 <-> "t2",
0b01000 <-> "fp",
0b01001 <-> "s1",
0b01010 <-> "a0",
0b01011 <-> "a1",
0b01100 <-> "a2",
0b01101 <-> "a3",
0b01110 <-> "a4",
0b01111 <-> "a5",
0b10000 <-> "a6",
0b10001 <-> "a7",
0b10010 <-> "s2",
0b10011 <-> "s3",
0b10100 <-> "s4",
0b10101 <-> "s5",
0b10110 <-> "s6",
0b10111 <-> "s7",
0b11000 <-> "s8",
0b11001 <-> "s9",
0b11010 <-> "s10",
0b11011 <-> "s11",
0b11100 <-> "t3",
0b11101 <-> "t4",
0b11110 <-> "t5",
0b11111 <-> "t6"
}
mapping creg_name : bits(3) <-> string = {
0b000 <-> "s0",
0b001 <-> "s1",
0b010 <-> "a0",
0b011 <-> "a1",
0b100 <-> "a2",
0b101 <-> "a3",
0b110 <-> "a4",
0b111 <-> "a5"
}
val init_base_regs : unit -> unit
function init_base_regs () = {
x1 = zero_reg;
x2 = zero_reg;
x3 = zero_reg;
x4 = zero_reg;
x5 = zero_reg;
x6 = zero_reg;
x7 = zero_reg;
x8 = zero_reg;
x9 = zero_reg;
x10 = zero_reg;
x11 = zero_reg;
x12 = zero_reg;
x13 = zero_reg;
x14 = zero_reg;
x15 = zero_reg;
x16 = zero_reg;
x17 = zero_reg;
x18 = zero_reg;
x19 = zero_reg;
x20 = zero_reg;
x21 = zero_reg;
x22 = zero_reg;
x23 = zero_reg;
x24 = zero_reg;
x25 = zero_reg;
x26 = zero_reg;
x27 = zero_reg;
x28 = zero_reg;
x29 = zero_reg;
x30 = zero_reg;
x31 = zero_reg
}
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