/* OpenRISC simulator support code
Copyright (C) 2017-2020 Free Software Foundation, Inc.
This file is part of GDB, the GNU debugger.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#define WANT_CPU_OR1K32BF
#define WANT_CPU
#include "sim-main.h"
#include "symcat.h"
#include "cgen-ops.h"
#include "cgen-mem.h"
#include "cpuall.h"
#include <string.h>
int
or1k32bf_fetch_register (sim_cpu *current_cpu, int rn, unsigned char *buf,
int len)
{
if (rn < 32)
SETTWI (buf, GET_H_GPR (rn));
else
switch (rn)
{
case PPC_REGNUM:
SETTWI (buf, GET_H_SYS_PPC ());
break;
case PC_REGNUM:
SETTWI (buf, GET_H_PC ());
break;
case SR_REGNUM:
SETTWI (buf, GET_H_SYS_SR ());
break;
default:
return 0;
}
return sizeof (WI); /* WI from arch.h */
}
int
or1k32bf_store_register (sim_cpu *current_cpu, int rn, unsigned char *buf,
int len)
{
if (rn < 32)
SET_H_GPR (rn, GETTWI (buf));
else
switch (rn)
{
case PPC_REGNUM:
SET_H_SYS_PPC (GETTWI (buf));
break;
case PC_REGNUM:
SET_H_PC (GETTWI (buf));
break;
case SR_REGNUM:
SET_H_SYS_SR (GETTWI (buf));
break;
default:
return 0;
}
return sizeof (WI); /* WI from arch.h */
}
int
or1k32bf_model_or1200_u_exec (sim_cpu *current_cpu, const IDESC *idesc,
int unit_num, int referenced)
{
return -1;
}
int
or1k32bf_model_or1200nd_u_exec (sim_cpu *current_cpu, const IDESC *idesc,
int unit_num, int referenced)
{
return -1;
}
void
or1k32bf_model_insn_before (sim_cpu *current_cpu, int first_p)
{
}
void
or1k32bf_model_insn_after (sim_cpu *current_cpu, int last_p, int cycles)
{
}
USI
or1k32bf_h_spr_get_raw (sim_cpu *current_cpu, USI addr)
{
SIM_DESC sd = CPU_STATE (current_cpu);
SIM_ASSERT (addr < NUM_SPR);
return current_cpu->spr[addr];
}
void
or1k32bf_h_spr_set_raw (sim_cpu *current_cpu, USI addr, USI val)
{
SIM_DESC sd = CPU_STATE (current_cpu);
SIM_ASSERT (addr < NUM_SPR);
current_cpu->spr[addr] = val;
}
USI
or1k32bf_h_spr_field_get_raw (sim_cpu *current_cpu, USI addr, int msb, int lsb)
{
SIM_DESC sd = CPU_STATE (current_cpu);
SIM_ASSERT (addr < NUM_SPR);
return LSEXTRACTED (current_cpu->spr[addr], msb, lsb);
}
void
or1k32bf_h_spr_field_set_raw (sim_cpu *current_cpu, USI addr, int msb, int lsb,
USI val)
{
current_cpu->spr[addr] &= ~LSMASK32 (msb, lsb);
current_cpu->spr[addr] |= LSINSERTED (val, msb, lsb);
}
/* Initialize a sim cpu object. */
void
or1k_cpu_init (SIM_DESC sd, sim_cpu *current_cpu, const USI or1k_vr,
const USI or1k_upr, const USI or1k_cpucfgr)
{
/* Set the configuration registers passed from the user. */
SET_H_SYS_VR (or1k_vr);
SET_H_SYS_UPR (or1k_upr);
SET_H_SYS_CPUCFGR (or1k_cpucfgr);
#define CHECK_SPR_FIELD(GROUP, INDEX, FIELD, test) \
do \
{ \
USI field = GET_H_##SYS##_##INDEX##_##FIELD (); \
if (!(test)) \
sim_io_eprintf \
(sd, "WARNING: unsupported %s field in %s register: 0x%x\n", \
#FIELD, #INDEX, field); \
} while (0)
/* Set flags indicating if we are in a delay slot or not. */
current_cpu->next_delay_slot = 0;
current_cpu->delay_slot = 0;
/* Verify any user passed fields and warn on configurations we don't
support. */
CHECK_SPR_FIELD (SYS, UPR, UP, field == 1);
CHECK_SPR_FIELD (SYS, UPR, DCP, field == 0);
CHECK_SPR_FIELD (SYS, UPR, ICP, field == 0);
CHECK_SPR_FIELD (SYS, UPR, DMP, field == 0);
CHECK_SPR_FIELD (SYS, UPR, MP, field == 0);
CHECK_SPR_FIELD (SYS, UPR, IMP, field == 0);
CHECK_SPR_FIELD (SYS, UPR, DUP, field == 0);
CHECK_SPR_FIELD (SYS, UPR, PCUP, field == 0);
CHECK_SPR_FIELD (SYS, UPR, PICP, field == 0);
CHECK_SPR_FIELD (SYS, UPR, PMP, field == 0);
CHECK_SPR_FIELD (SYS, UPR, TTP, field == 0);
CHECK_SPR_FIELD (SYS, UPR, CUP, field == 0);
CHECK_SPR_FIELD (SYS, CPUCFGR, NSGR, field == 0);
CHECK_SPR_FIELD (SYS, CPUCFGR, CGF, field == 0);
CHECK_SPR_FIELD (SYS, CPUCFGR, OB32S, field == 1);
CHECK_SPR_FIELD (SYS, CPUCFGR, OF32S, field == 1);
CHECK_SPR_FIELD (SYS, CPUCFGR, OB64S, field == 0);
CHECK_SPR_FIELD (SYS, CPUCFGR, OF64S, field == 0);
CHECK_SPR_FIELD (SYS, CPUCFGR, OV64S, field == 0);
#undef CHECK_SPR_FIELD
/* Configure the fpu operations and mark fpu available. */
cgen_init_accurate_fpu (current_cpu, CGEN_CPU_FPU (current_cpu),
or1k32bf_fpu_error);
SET_H_SYS_CPUCFGR_OF32S (1);
/* Set the UPR[UP] flag, even if the user tried to unset it, as we always
support the Unit Present Register. */
SET_H_SYS_UPR_UP (1);
/* Set the supervisor register to indicate we are in supervisor mode and
set the Fixed-One bit which must always be set. */
SET_H_SYS_SR (SPR_FIELD_MASK_SYS_SR_SM | SPR_FIELD_MASK_SYS_SR_FO);
/* Clear the floating point control status register. */
SET_H_SYS_FPCSR (0);
}
void
or1k32bf_insn_before (sim_cpu *current_cpu, SEM_PC vpc, const IDESC *idesc)
{
SIM_DESC sd = CPU_STATE (current_cpu);
current_cpu->delay_slot = current_cpu->next_delay_slot;
current_cpu->next_delay_slot = 0;
if (current_cpu->delay_slot &&
CGEN_ATTR_BOOLS (CGEN_INSN_ATTRS ((idesc)->idata)) &
CGEN_ATTR_MASK (CGEN_INSN_NOT_IN_DELAY_SLOT))
{
USI pc;
#ifdef WITH_SCACHE
pc = vpc->argbuf.addr;
#else
pc = vpc;
#endif
sim_io_error (sd, "invalid instruction in a delay slot at PC 0x%08x",
pc);
}
}
void
or1k32bf_insn_after (sim_cpu *current_cpu, SEM_PC vpc, const IDESC *idesc)
{
SIM_DESC sd = CPU_STATE (current_cpu);
USI ppc;
#ifdef WITH_SCACHE
ppc = vpc->argbuf.addr;
#else
ppc = vpc;
#endif
SET_H_SYS_PPC (ppc);
if (!GET_H_SYS_CPUCFGR_ND () &&
CGEN_ATTR_BOOLS (CGEN_INSN_ATTRS ((idesc)->idata)) &
CGEN_ATTR_MASK (CGEN_INSN_DELAYED_CTI))
{
SIM_ASSERT (!current_cpu->delay_slot);
current_cpu->next_delay_slot = 1;
}
}
void
or1k32bf_nop (sim_cpu *current_cpu, USI uimm16)
{
SIM_DESC sd = CPU_STATE (current_cpu);
switch (uimm16)
{
case NOP_NOP:
break;
case NOP_EXIT:
sim_io_printf (CPU_STATE (current_cpu), "exit(%d)\n", GET_H_GPR (3));
/* fall through */
case NOP_EXIT_SILENT:
sim_engine_halt (sd, current_cpu, NULL, CPU_PC_GET (current_cpu),
sim_exited, GET_H_GPR (3));
break;
case NOP_REPORT:
sim_io_printf (CPU_STATE (current_cpu), "report(0x%08x);\n",
GET_H_GPR (3));
break;
case NOP_PUTC:
sim_io_printf (CPU_STATE (current_cpu), "%c",
(char) (GET_H_GPR (3) & 0xff));
break;
default:
sim_io_eprintf (sd, "WARNING: l.nop with unsupported code 0x%08x\n",
uimm16);
break;
}
}
/* Build an address value used for load and store instructions. For example,
the instruction 'l.lws rD, I(rA)' will require to load data from the 4 byte
address represented by rA + I. Here the argument base is rA, offset is I
and the size is the read size in bytes. Note, OpenRISC requires that word
and half-word access be word and half-word aligned respectively, the check
for alignment is not needed here. */
USI
or1k32bf_make_load_store_addr (sim_cpu *current_cpu, USI base, SI offset,
int size)
{
SIM_DESC sd = CPU_STATE (current_cpu);
USI addr = base + offset;
/* If little endian load/store is enabled we adjust the byte and half-word
addresses to the little endian equivalent. */
if (GET_H_SYS_SR_LEE ())
{
switch (size)
{
case 4: /* We are retrieving the entire word no adjustment. */
break;
case 2: /* Perform half-word adjustment 0 -> 2, 2 -> 0. */
addr ^= 0x2;
break;
case 1: /* Perform byte adjustment, 0 -> 3, 2 -> 3, etc. */
addr ^= 0x3;
break;
default:
SIM_ASSERT (0);
return 0;
}
}
return addr;
}
/* The find first 1 instruction returns the location of the first set bit
in the argument register. */
USI
or1k32bf_ff1 (sim_cpu *current_cpu, USI val)
{
USI bit;
USI ret;
for (bit = 1, ret = 1; bit; bit <<= 1, ret++)
{
if (val & bit)
return ret;
}
return 0;
}
/* The find last 1 instruction returns the location of the last set bit in
the argument register. */
USI
or1k32bf_fl1 (sim_cpu *current_cpu, USI val)
{
USI bit;
USI ret;
for (bit = 1 << 31, ret = 32; bit; bit >>= 1, ret--)
{
if (val & bit)
return ret;
}
return 0;
}