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binutils-gdb/sim/pru/interp.c
Joel Brobecker 213516ef31 Update copyright year range in header of all files managed by GDB 
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/* Simulator for the Texas Instruments PRU processor
Copyright 2009-2023 Free Software Foundation, Inc.
Inspired by the Microblaze simulator
Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
This file is part of the simulators.
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/>. */
/* This must come before any other includes. */
#include "defs.h"
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#include "bfd.h"
#include "sim/callback.h"
#include "libiberty.h"
#include "sim/sim.h"
#include "sim-main.h"
#include "sim-assert.h"
#include "sim-options.h"
#include "sim-signal.h"
#include "sim-syscall.h"
#include "pru.h"
/* DMEM zero address is perfectly valid. But if CRT leaves the first word
alone, we can use it as a trap to catch NULL pointer access. */
static bfd_boolean abort_on_dmem_zero_access;
enum {
OPTION_ERROR_NULL_DEREF = OPTION_START,
};
/* Extract (from PRU endianess) and return an integer in HOST's endianness. */
static uint32_t
pru_extract_unsigned_integer (const uint8_t *addr, size_t len)
{
uint32_t retval;
const uint8_t *p;
const uint8_t *startaddr = addr;
const uint8_t *endaddr = startaddr + len;
/* Start at the most significant end of the integer, and work towards
the least significant. */
retval = 0;
for (p = endaddr; p > startaddr;)
retval = (retval << 8) | * -- p;
return retval;
}
/* Store "val" (which is in HOST's endianess) into "addr"
(using PRU's endianness). */
static void
pru_store_unsigned_integer (uint8_t *addr, size_t len, uint32_t val)
{
uint8_t *p;
uint8_t *startaddr = (uint8_t *)addr;
uint8_t *endaddr = startaddr + len;
for (p = startaddr; p < endaddr;)
{
*p++ = val & 0xff;
val >>= 8;
}
}
/* Extract a field value from CPU register using the given REGSEL selector.
Byte number maps directly to first values of RSEL, so we can
safely use "regsel" as a register byte number (0..3). */
static inline uint32_t
extract_regval (uint32_t val, uint32_t regsel)
{
ASSERT (RSEL_7_0 == 0);
ASSERT (RSEL_15_8 == 1);
ASSERT (RSEL_23_16 == 2);
ASSERT (RSEL_31_24 == 3);
switch (regsel)
{
case RSEL_7_0: return (val >> 0) & 0xff;
case RSEL_15_8: return (val >> 8) & 0xff;
case RSEL_23_16: return (val >> 16) & 0xff;
case RSEL_31_24: return (val >> 24) & 0xff;
case RSEL_15_0: return (val >> 0) & 0xffff;
case RSEL_23_8: return (val >> 8) & 0xffff;
case RSEL_31_16: return (val >> 16) & 0xffff;
case RSEL_31_0: return val;
default: sim_io_error (NULL, "invalid regsel");
}
}
/* Write a value into CPU subregister pointed by reg and regsel. */
static inline void
write_regval (uint32_t val, uint32_t *reg, uint32_t regsel)
{
uint32_t mask, sh;
switch (regsel)
{
case RSEL_7_0: mask = (0xffu << 0); sh = 0; break;
case RSEL_15_8: mask = (0xffu << 8); sh = 8; break;
case RSEL_23_16: mask = (0xffu << 16); sh = 16; break;
case RSEL_31_24: mask = (0xffu << 24); sh = 24; break;
case RSEL_15_0: mask = (0xffffu << 0); sh = 0; break;
case RSEL_23_8: mask = (0xffffu << 8); sh = 8; break;
case RSEL_31_16: mask = (0xffffu << 16); sh = 16; break;
case RSEL_31_0: mask = 0xffffffffu; sh = 0; break;
default: sim_io_error (NULL, "invalid regsel");
}
*reg = (*reg & ~mask) | ((val << sh) & mask);
}
/* Convert the given IMEM word address to a regular byte address used by the
GNU ELF container. */
static uint32_t
imem_wordaddr_to_byteaddr (SIM_CPU *cpu, uint16_t wa)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
return (((uint32_t) wa << 2) & IMEM_ADDR_MASK) | PC_ADDR_SPACE_MARKER;
}
/* Convert the given ELF text byte address to IMEM word address. */
static uint16_t
imem_byteaddr_to_wordaddr (SIM_CPU *cpu, uint32_t ba)
{
return (ba >> 2) & 0xffff;
}
/* Store "nbytes" into DMEM "addr" from CPU register file, starting with
register "regn", and byte "regb" within it. */
static inline void
pru_reg2dmem (SIM_CPU *cpu, uint32_t addr, unsigned int nbytes,
int regn, int regb)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
/* GDB assumes unconditional access to all memories, so enable additional
checks only in standalone mode. */
bool standalone = (STATE_OPEN_KIND (CPU_STATE (cpu)) == SIM_OPEN_STANDALONE);
if (abort_on_dmem_zero_access && addr < 4)
{
sim_core_signal (CPU_STATE (cpu), cpu, PC_byteaddr, write_map,
nbytes, addr, write_transfer,
sim_core_unmapped_signal);
}
else if (standalone && ((addr >= PC_ADDR_SPACE_MARKER)
|| (addr + nbytes > PC_ADDR_SPACE_MARKER)))
{
sim_core_signal (CPU_STATE (cpu), cpu, PC_byteaddr, write_map,
nbytes, addr, write_transfer,
sim_core_unmapped_signal);
}
else if ((regn * 4 + regb + nbytes) > (32 * 4))
{
sim_io_eprintf (CPU_STATE (cpu),
"SBBO/SBCO with invalid store data length\n");
RAISE_SIGILL (CPU_STATE (cpu));
}
else
{
TRACE_MEMORY (cpu, "write of %d bytes to %08x", nbytes, addr);
while (nbytes--)
{
sim_core_write_1 (cpu,
PC_byteaddr,
write_map,
addr++,
extract_regval (CPU.regs[regn], regb));
if (++regb >= 4)
{
regb = 0;
regn++;
}
}
}
}
/* Load "nbytes" from DMEM "addr" into CPU register file, starting with
register "regn", and byte "regb" within it. */
static inline void
pru_dmem2reg (SIM_CPU *cpu, uint32_t addr, unsigned int nbytes,
int regn, int regb)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
/* GDB assumes unconditional access to all memories, so enable additional
checks only in standalone mode. */
bool standalone = (STATE_OPEN_KIND (CPU_STATE (cpu)) == SIM_OPEN_STANDALONE);
if (abort_on_dmem_zero_access && addr < 4)
{
sim_core_signal (CPU_STATE (cpu), cpu, PC_byteaddr, read_map,
nbytes, addr, read_transfer,
sim_core_unmapped_signal);
}
else if (standalone && ((addr >= PC_ADDR_SPACE_MARKER)
|| (addr + nbytes > PC_ADDR_SPACE_MARKER)))
{
/* This check is necessary because our IMEM "address space"
is not really accessible, yet we have mapped it as a generic
memory space. */
sim_core_signal (CPU_STATE (cpu), cpu, PC_byteaddr, read_map,
nbytes, addr, read_transfer,
sim_core_unmapped_signal);
}
else if ((regn * 4 + regb + nbytes) > (32 * 4))
{
sim_io_eprintf (CPU_STATE (cpu),
"LBBO/LBCO with invalid load data length\n");
RAISE_SIGILL (CPU_STATE (cpu));
}
else
{
unsigned int b;
TRACE_MEMORY (cpu, "read of %d bytes from %08x", nbytes, addr);
while (nbytes--)
{
b = sim_core_read_1 (cpu, PC_byteaddr, read_map, addr++);
/* Reuse the fact the Register Byte Number maps directly to RSEL. */
ASSERT (RSEL_7_0 == 0);
write_regval (b, &CPU.regs[regn], regb);
if (++regb >= 4)
{
regb = 0;
regn++;
}
}
}
}
/* Set reset values of general-purpose registers. */
static void
set_initial_gprs (SIM_CPU *cpu)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
int i;
/* Set up machine just out of reset. */
CPU_PC_SET (cpu, 0);
PC_ADDR_SPACE_MARKER = IMEM_ADDR_DEFAULT; /* from default linker script? */
/* Clean out the GPRs. */
for (i = 0; i < ARRAY_SIZE (CPU.regs); i++)
CPU.regs[i] = 0;
for (i = 0; i < ARRAY_SIZE (CPU.macregs); i++)
CPU.macregs[i] = 0;
CPU.loop.looptop = CPU.loop.loopend = 0;
CPU.loop.loop_in_progress = 0;
CPU.loop.loop_counter = 0;
CPU.carry = 0;
CPU.insts = 0;
CPU.cycles = 0;
/* AM335x should provide sane defaults. */
CPU.ctable[0] = 0x00020000;
CPU.ctable[1] = 0x48040000;
CPU.ctable[2] = 0x4802a000;
CPU.ctable[3] = 0x00030000;
CPU.ctable[4] = 0x00026000;
CPU.ctable[5] = 0x48060000;
CPU.ctable[6] = 0x48030000;
CPU.ctable[7] = 0x00028000;
CPU.ctable[8] = 0x46000000;
CPU.ctable[9] = 0x4a100000;
CPU.ctable[10] = 0x48318000;
CPU.ctable[11] = 0x48022000;
CPU.ctable[12] = 0x48024000;
CPU.ctable[13] = 0x48310000;
CPU.ctable[14] = 0x481cc000;
CPU.ctable[15] = 0x481d0000;
CPU.ctable[16] = 0x481a0000;
CPU.ctable[17] = 0x4819c000;
CPU.ctable[18] = 0x48300000;
CPU.ctable[19] = 0x48302000;
CPU.ctable[20] = 0x48304000;
CPU.ctable[21] = 0x00032400;
CPU.ctable[22] = 0x480c8000;
CPU.ctable[23] = 0x480ca000;
CPU.ctable[24] = 0x00000000;
CPU.ctable[25] = 0x00002000;
CPU.ctable[26] = 0x0002e000;
CPU.ctable[27] = 0x00032000;
CPU.ctable[28] = 0x00000000;
CPU.ctable[29] = 0x49000000;
CPU.ctable[30] = 0x40000000;
CPU.ctable[31] = 0x80000000;
}
/* Map regsel selector to subregister field width. */
static inline unsigned int
regsel_width (uint32_t regsel)
{
switch (regsel)
{
case RSEL_7_0: return 8;
case RSEL_15_8: return 8;
case RSEL_23_16: return 8;
case RSEL_31_24: return 8;
case RSEL_15_0: return 16;
case RSEL_23_8: return 16;
case RSEL_31_16: return 16;
case RSEL_31_0: return 32;
default: sim_io_error (NULL, "invalid regsel");
}
}
/* Handle XIN instruction addressing the MAC peripheral. */
static void
pru_sim_xin_mac (SIM_DESC sd, SIM_CPU *cpu, unsigned int rd_regn,
unsigned int rdb, unsigned int length)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
if (rd_regn < 25 || (rd_regn * 4 + rdb + length) > (27 + 1) * 4)
sim_io_error (sd, "XIN MAC: invalid transfer regn=%u.%u, length=%u\n",
rd_regn, rdb, length);
/* Copy from MAC to PRU regs. Ranges have been validated above. */
while (length--)
{
write_regval (CPU.macregs[rd_regn - 25] >> (rdb * 8),
&CPU.regs[rd_regn],
rdb);
if (++rdb == 4)
{
rdb = 0;
rd_regn++;
}
}
}
/* Handle XIN instruction. */
static void
pru_sim_xin (SIM_DESC sd, SIM_CPU *cpu, unsigned int wba,
unsigned int rd_regn, unsigned int rdb, unsigned int length)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
if (wba == 0)
{
pru_sim_xin_mac (sd, cpu, rd_regn, rdb, length);
}
else if (wba == XFRID_SCRATCH_BANK_0 || wba == XFRID_SCRATCH_BANK_1
|| wba == XFRID_SCRATCH_BANK_2 || wba == XFRID_SCRATCH_BANK_PEER)
{
while (length--)
{
unsigned int val;
val = extract_regval (CPU.scratchpads[wba][rd_regn], rdb);
write_regval (val, &CPU.regs[rd_regn], rdb);
if (++rdb == 4)
{
rdb = 0;
rd_regn++;
}
}
}
else if (wba == 254 || wba == 255)
{
/* FILL/ZERO pseudos implemented via XIN. */
unsigned int fillbyte = (wba == 254) ? 0xff : 0x00;
while (length--)
{
write_regval (fillbyte, &CPU.regs[rd_regn], rdb);
if (++rdb == 4)
{
rdb = 0;
rd_regn++;
}
}
}
else
{
sim_io_error (sd, "XIN: XFR device %d not supported.\n", wba);
}
}
/* Handle XOUT instruction addressing the MAC peripheral. */
static void
pru_sim_xout_mac (SIM_DESC sd, SIM_CPU *cpu, unsigned int rd_regn,
unsigned int rdb, unsigned int length)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
const int modereg_accessed = (rd_regn == 25);
/* Multiple Accumulate. */
if (rd_regn < 25 || (rd_regn * 4 + rdb + length) > (27 + 1) * 4)
sim_io_error (sd, "XOUT MAC: invalid transfer regn=%u.%u, length=%u\n",
rd_regn, rdb, length);
/* Copy from PRU to MAC regs. Ranges have been validated above. */
while (length--)
{
write_regval (CPU.regs[rd_regn] >> (rdb * 8),
&CPU.macregs[rd_regn - 25],
rdb);
if (++rdb == 4)
{
rdb = 0;
rd_regn++;
}
}
if (modereg_accessed
&& (CPU.macregs[PRU_MACREG_MODE] & MAC_R25_MAC_MODE_MASK))
{
/* MUL/MAC operands are sampled every XOUT in multiply and
accumulate mode. */
uint64_t prod, oldsum, sum;
CPU.macregs[PRU_MACREG_OP_0] = CPU.regs[28];
CPU.macregs[PRU_MACREG_OP_1] = CPU.regs[29];
prod = CPU.macregs[PRU_MACREG_OP_0];
prod *= (uint64_t)CPU.macregs[PRU_MACREG_OP_1];
oldsum = CPU.macregs[PRU_MACREG_ACC_L];
oldsum += (uint64_t)CPU.macregs[PRU_MACREG_ACC_H] << 32;
sum = oldsum + prod;
CPU.macregs[PRU_MACREG_PROD_L] = sum & 0xfffffffful;
CPU.macregs[PRU_MACREG_PROD_H] = sum >> 32;
CPU.macregs[PRU_MACREG_ACC_L] = CPU.macregs[PRU_MACREG_PROD_L];
CPU.macregs[PRU_MACREG_ACC_H] = CPU.macregs[PRU_MACREG_PROD_H];
if (oldsum > sum)
CPU.macregs[PRU_MACREG_MODE] |= MAC_R25_ACC_CARRY_MASK;
}
if (modereg_accessed
&& (CPU.macregs[PRU_MACREG_MODE] & MAC_R25_ACC_CARRY_MASK))
{
/* store 1 to clear. */
CPU.macregs[PRU_MACREG_MODE] &= ~MAC_R25_ACC_CARRY_MASK;
CPU.macregs[PRU_MACREG_ACC_L] = 0;
CPU.macregs[PRU_MACREG_ACC_H] = 0;
}
}
/* Handle XOUT instruction. */
static void
pru_sim_xout (SIM_DESC sd, SIM_CPU *cpu, unsigned int wba,
unsigned int rd_regn, unsigned int rdb, unsigned int length)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
if (wba == 0)
{
pru_sim_xout_mac (sd, cpu, rd_regn, rdb, length);
}
else if (wba == XFRID_SCRATCH_BANK_0 || wba == XFRID_SCRATCH_BANK_1
|| wba == XFRID_SCRATCH_BANK_2 || wba == XFRID_SCRATCH_BANK_PEER)
{
while (length--)
{
unsigned int val;
val = extract_regval (CPU.regs[rd_regn], rdb);
write_regval (val, &CPU.scratchpads[wba][rd_regn], rdb);
if (++rdb == 4)
{
rdb = 0;
rd_regn++;
}
}
}
else
sim_io_error (sd, "XOUT: XFR device %d not supported.\n", wba);
}
/* Handle XCHG instruction. */
static void
pru_sim_xchg (SIM_DESC sd, SIM_CPU *cpu, unsigned int wba,
unsigned int rd_regn, unsigned int rdb, unsigned int length)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
if (wba == XFRID_SCRATCH_BANK_0 || wba == XFRID_SCRATCH_BANK_1
|| wba == XFRID_SCRATCH_BANK_2 || wba == XFRID_SCRATCH_BANK_PEER)
{
while (length--)
{
unsigned int valr, vals;
valr = extract_regval (CPU.regs[rd_regn], rdb);
vals = extract_regval (CPU.scratchpads[wba][rd_regn], rdb);
write_regval (valr, &CPU.scratchpads[wba][rd_regn], rdb);
write_regval (vals, &CPU.regs[rd_regn], rdb);
if (++rdb == 4)
{
rdb = 0;
rd_regn++;
}
}
}
else
sim_io_error (sd, "XOUT: XFR device %d not supported.\n", wba);
}
/* Handle syscall simulation. Its ABI is specific to the GNU simulator. */
static void
pru_sim_syscall (SIM_DESC sd, SIM_CPU *cpu)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
/* If someday TI confirms that the "reserved" HALT opcode fields
can be used for extra arguments, then maybe we can embed
the syscall number there. Until then, let's use R1. */
const uint32_t syscall_num = CPU.regs[1];
long ret;
ret = sim_syscall (cpu, syscall_num,
CPU.regs[14], CPU.regs[15],
CPU.regs[16], CPU.regs[17]);
CPU.regs[14] = ret;
}
/* Simulate one instruction. */
static void
sim_step_once (SIM_DESC sd)
{
SIM_CPU *cpu = STATE_CPU (sd, 0);
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
const struct pru_opcode *op;
uint32_t inst;
uint32_t _RDVAL, OP2; /* intermediate values. */
int rd_is_modified = 0; /* RD modified and must be stored back. */
/* Fetch the initial instruction that we'll decode. */
inst = sim_core_read_4 (cpu, PC_byteaddr, exec_map, PC_byteaddr);
TRACE_MEMORY (cpu, "read of insn 0x%08x from %08x", inst, PC_byteaddr);
op = pru_find_opcode (inst);
if (!op)
{
sim_io_eprintf (sd, "Unknown instruction 0x%04x\n", inst);
RAISE_SIGILL (sd);
}
else
{
TRACE_DISASM (cpu, PC_byteaddr);
/* In multiply-only mode, R28/R29 operands are sampled on every clock
cycle. */
if ((CPU.macregs[PRU_MACREG_MODE] & MAC_R25_MAC_MODE_MASK) == 0)
{
CPU.macregs[PRU_MACREG_OP_0] = CPU.regs[28];
CPU.macregs[PRU_MACREG_OP_1] = CPU.regs[29];
}
switch (op->type)
{
/* Helper macro to improve clarity of pru.isa. The empty while is a
guard against using RD as a left-hand side value. */
#define RD do { } while (0); rd_is_modified = 1; _RDVAL
#define INSTRUCTION(NAME, ACTION) \
case prui_ ## NAME: \
ACTION; \
break;
#include "pru.isa"
#undef INSTRUCTION
#undef RD
default:
RAISE_SIGILL (sd);
}
if (rd_is_modified)
write_regval (_RDVAL, &CPU.regs[RD_REGN], RDSEL);
/* Don't treat r30 and r31 as regular registers, they are I/O! */
CPU.regs[30] = 0;
CPU.regs[31] = 0;
/* Handle PC match of loop end. */
if (LOOP_IN_PROGRESS && (PC == LOOPEND))
{
SIM_ASSERT (LOOPCNT > 0);
if (--LOOPCNT == 0)
LOOP_IN_PROGRESS = 0;
else
PC = LOOPTOP;
}
/* In multiply-only mode, MAC does multiplication every cycle. */
if ((CPU.macregs[PRU_MACREG_MODE] & MAC_R25_MAC_MODE_MASK) == 0)
{
uint64_t prod;
prod = CPU.macregs[PRU_MACREG_OP_0];
prod *= (uint64_t)CPU.macregs[PRU_MACREG_OP_1];
CPU.macregs[PRU_MACREG_PROD_L] = prod & 0xfffffffful;
CPU.macregs[PRU_MACREG_PROD_H] = prod >> 32;
/* Clear the MAC accumulator when in normal mode. */
CPU.macregs[PRU_MACREG_ACC_L] = 0;
CPU.macregs[PRU_MACREG_ACC_H] = 0;
}
/* Update cycle counts. */
CPU.insts += 1; /* One instruction completed ... */
CPU.cycles += 1; /* ... and it takes a single cycle. */
/* Account for memory access latency with a reasonable estimate.
No distinction is currently made between SRAM, DRAM and generic
L3 slaves. */
if (op->type == prui_lbbo || op->type == prui_sbbo
|| op->type == prui_lbco || op->type == prui_sbco)
CPU.cycles += 2;
}
}
/* Implement standard sim_engine_run function. */
void
sim_engine_run (SIM_DESC sd,
int next_cpu_nr, /* ignore */
int nr_cpus, /* ignore */
int siggnal) /* ignore */
{
while (1)
{
sim_step_once (sd);
if (sim_events_tick (sd))
sim_events_process (sd);
}
}
/* Implement callback for standard CPU_PC_FETCH routine. */
static sim_cia
pru_pc_get (sim_cpu *cpu)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
/* Present PC as byte address. */
return imem_wordaddr_to_byteaddr (cpu, pru_cpu->pc);
}
/* Implement callback for standard CPU_PC_STORE routine. */
static void
pru_pc_set (sim_cpu *cpu, sim_cia pc)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
/* PC given as byte address. */
pru_cpu->pc = imem_byteaddr_to_wordaddr (cpu, pc);
}
/* Implement callback for standard CPU_REG_STORE routine. */
static int
pru_store_register (SIM_CPU *cpu, int rn, const void *memory, int length)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
if (rn < NUM_REGS && rn >= 0)
{
if (length == 4)
{
/* Misalignment safe. */
long ival = pru_extract_unsigned_integer (memory, 4);
if (rn < 32)
CPU.regs[rn] = ival;
else
pru_pc_set (cpu, ival);
return 4;
}
else
return 0;
}
else
return 0;
}
/* Implement callback for standard CPU_REG_FETCH routine. */
static int
pru_fetch_register (SIM_CPU *cpu, int rn, void *memory, int length)
{
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
long ival;
if (rn < NUM_REGS && rn >= 0)
{
if (length == 4)
{
if (rn < 32)
ival = CPU.regs[rn];
else
ival = pru_pc_get (cpu);
/* Misalignment-safe. */
pru_store_unsigned_integer (memory, 4, ival);
return 4;
}
else
return 0;
}
else
return 0;
}
static void
free_state (SIM_DESC sd)
{
if (STATE_MODULES (sd) != NULL)
sim_module_uninstall (sd);
sim_cpu_free_all (sd);
sim_state_free (sd);
}
/* Declare the PRU option handler. */
static DECLARE_OPTION_HANDLER (pru_option_handler);
/* Implement the PRU option handler. */
static SIM_RC
pru_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt, char *arg,
int is_command)
{
switch (opt)
{
case OPTION_ERROR_NULL_DEREF:
abort_on_dmem_zero_access = TRUE;
return SIM_RC_OK;
default:
sim_io_eprintf (sd, "Unknown PRU option %d\n", opt);
return SIM_RC_FAIL;
}
}
/* List of PRU-specific options. */
static const OPTION pru_options[] =
{
{ {"error-null-deref", no_argument, NULL, OPTION_ERROR_NULL_DEREF},
'\0', NULL, "Trap any access to DMEM address zero",
pru_option_handler, NULL },
{ {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL, NULL }
};
/* Implement standard sim_open function. */
SIM_DESC
sim_open (SIM_OPEN_KIND kind, host_callback *cb,
struct bfd *abfd, char * const *argv)
{
int i;
char c;
SIM_DESC sd = sim_state_alloc (kind, cb);
SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
/* Set default options before parsing user options. */
current_alignment = STRICT_ALIGNMENT;
current_target_byte_order = BFD_ENDIAN_LITTLE;
/* The cpu data is kept in a separately allocated chunk of memory. */
if (sim_cpu_alloc_all_extra (sd, 0, sizeof (struct pru_regset)) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
sim_add_option_table (sd, NULL, pru_options);
/* The parser will print an error message for us, so we silently return. */
if (sim_parse_args (sd, argv) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
/* Check for/establish a reference program image. */
if (sim_analyze_program (sd, STATE_PROG_FILE (sd), abfd) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
/* Configure/verify the target byte order and other runtime
configuration options. */
if (sim_config (sd) != SIM_RC_OK)
{
sim_module_uninstall (sd);
return 0;
}
if (sim_post_argv_init (sd) != SIM_RC_OK)
{
/* Uninstall the modules to avoid memory leaks,
file descriptor leaks, etc. */
sim_module_uninstall (sd);
return 0;
}
/* CPU specific initialization. */
for (i = 0; i < MAX_NR_PROCESSORS; ++i)
{
SIM_CPU *cpu = STATE_CPU (sd, i);
CPU_REG_STORE (cpu) = pru_store_register;
CPU_REG_FETCH (cpu) = pru_fetch_register;
CPU_PC_FETCH (cpu) = pru_pc_get;
CPU_PC_STORE (cpu) = pru_pc_set;
set_initial_gprs (cpu);
}
/* Allocate external memory if none specified by user.
Use address 4 here in case the user wanted address 0 unmapped. */
if (sim_core_read_buffer (sd, NULL, read_map, &c, 4, 1) == 0)
{
sim_do_commandf (sd, "memory-region 0x%x,0x%x",
0,
DMEM_DEFAULT_SIZE);
}
if (sim_core_read_buffer (sd, NULL, read_map, &c, IMEM_ADDR_DEFAULT, 1) == 0)
{
sim_do_commandf (sd, "memory-region 0x%x,0x%x",
IMEM_ADDR_DEFAULT,
IMEM_DEFAULT_SIZE);
}
return sd;
}
/* Implement standard sim_create_inferior function. */
SIM_RC
sim_create_inferior (SIM_DESC sd, struct bfd *prog_bfd,
char * const *argv, char * const *env)
{
SIM_CPU *cpu = STATE_CPU (sd, 0);
struct pru_regset *pru_cpu = PRU_SIM_CPU (cpu);
host_callback *cb = STATE_CALLBACK (sd);
bfd_vma addr;
addr = bfd_get_start_address (prog_bfd);
sim_pc_set (cpu, addr);
PC_ADDR_SPACE_MARKER = addr & ~IMEM_ADDR_MASK;
/* Standalone mode (i.e. `run`) will take care of the argv for us in
sim_open () -> sim_parse_args (). But in debug mode (i.e. 'target sim'
with `gdb`), we need to handle it because the user can change the
argv on the fly via gdb's 'run'. */
if (STATE_PROG_ARGV (sd) != argv)
{
freeargv (STATE_PROG_ARGV (sd));
STATE_PROG_ARGV (sd) = dupargv (argv);
}
if (STATE_PROG_ENVP (sd) != env)
{
freeargv (STATE_PROG_ENVP (sd));
STATE_PROG_ENVP (sd) = dupargv (env);
}
cb->argv = STATE_PROG_ARGV (sd);
cb->envp = STATE_PROG_ENVP (sd);
return SIM_RC_OK;
}
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