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1330 lines
31 KiB
C
1330 lines
31 KiB
C
/* Simulator for the moxie processor
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Copyright (C) 2008-2018 Free Software Foundation, Inc.
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Contributed by Anthony Green
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This file is part of GDB, the GNU debugger.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include <fcntl.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/times.h>
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#include <sys/param.h>
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#include <unistd.h>
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#include "bfd.h"
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#include "libiberty.h"
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#include "gdb/remote-sim.h"
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#include "sim-main.h"
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#include "sim-base.h"
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#include "sim-options.h"
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typedef int word;
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typedef unsigned int uword;
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/* Extract the signed 10-bit offset from a 16-bit branch
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instruction. */
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#define INST2OFFSET(o) ((((signed short)((o & ((1<<10)-1))<<6))>>6)<<1)
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#define EXTRACT_WORD(addr) \
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((sim_core_read_aligned_1 (scpu, cia, read_map, addr) << 24) \
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+ (sim_core_read_aligned_1 (scpu, cia, read_map, addr+1) << 16) \
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+ (sim_core_read_aligned_1 (scpu, cia, read_map, addr+2) << 8) \
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+ (sim_core_read_aligned_1 (scpu, cia, read_map, addr+3)))
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#define EXTRACT_OFFSET(addr) \
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(unsigned int) \
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(((signed short) \
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((sim_core_read_aligned_1 (scpu, cia, read_map, addr) << 8) \
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+ (sim_core_read_aligned_1 (scpu, cia, read_map, addr+1))) << 16) >> 16)
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static unsigned long
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moxie_extract_unsigned_integer (unsigned char *addr, int len)
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{
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unsigned long retval;
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unsigned char * p;
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unsigned char * startaddr = (unsigned char *)addr;
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unsigned char * endaddr = startaddr + len;
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if (len > (int) sizeof (unsigned long))
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printf ("That operation is not available on integers of more than %zu bytes.",
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sizeof (unsigned long));
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/* Start at the most significant end of the integer, and work towards
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the least significant. */
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retval = 0;
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for (p = endaddr; p > startaddr;)
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retval = (retval << 8) | * -- p;
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return retval;
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}
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static void
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moxie_store_unsigned_integer (unsigned char *addr, int len, unsigned long val)
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{
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unsigned char * p;
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unsigned char * startaddr = (unsigned char *)addr;
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unsigned char * endaddr = startaddr + len;
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for (p = endaddr; p > startaddr;)
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{
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* -- p = val & 0xff;
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val >>= 8;
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}
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}
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/* moxie register names. */
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static const char *reg_names[16] =
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{ "$fp", "$sp", "$r0", "$r1", "$r2", "$r3", "$r4", "$r5",
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"$r6", "$r7", "$r8", "$r9", "$r10", "$r11", "$r12", "$r13" };
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/* The machine state.
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This state is maintained in host byte order. The fetch/store
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register functions must translate between host byte order and the
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target processor byte order. Keeping this data in target byte
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order simplifies the register read/write functions. Keeping this
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data in native order improves the performance of the simulator.
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Simulation speed is deemed more important. */
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#define NUM_MOXIE_REGS 17 /* Including PC */
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#define NUM_MOXIE_SREGS 256 /* The special registers */
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#define PC_REGNO 16
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/* The ordering of the moxie_regset structure is matched in the
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gdb/config/moxie/tm-moxie.h file in the REGISTER_NAMES macro. */
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/* TODO: This should be moved to sim-main.h:_sim_cpu. */
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struct moxie_regset
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{
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word regs[NUM_MOXIE_REGS + 1]; /* primary registers */
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word sregs[256]; /* special registers */
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word cc; /* the condition code reg */
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unsigned long long insts; /* instruction counter */
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};
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#define CC_GT 1<<0
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#define CC_LT 1<<1
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#define CC_EQ 1<<2
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#define CC_GTU 1<<3
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#define CC_LTU 1<<4
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/* TODO: This should be moved to sim-main.h:_sim_cpu. */
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union
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{
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struct moxie_regset asregs;
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word asints [1]; /* but accessed larger... */
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} cpu;
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static void
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set_initial_gprs (void)
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{
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int i;
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long space;
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/* Set up machine just out of reset. */
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cpu.asregs.regs[PC_REGNO] = 0;
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/* Clean out the register contents. */
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for (i = 0; i < NUM_MOXIE_REGS; i++)
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cpu.asregs.regs[i] = 0;
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for (i = 0; i < NUM_MOXIE_SREGS; i++)
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cpu.asregs.sregs[i] = 0;
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}
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/* Write a 1 byte value to memory. */
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static INLINE void
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wbat (sim_cpu *scpu, word pc, word x, word v)
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{
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address_word cia = CPU_PC_GET (scpu);
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sim_core_write_aligned_1 (scpu, cia, write_map, x, v);
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}
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/* Write a 2 byte value to memory. */
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static INLINE void
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wsat (sim_cpu *scpu, word pc, word x, word v)
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{
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address_word cia = CPU_PC_GET (scpu);
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sim_core_write_aligned_2 (scpu, cia, write_map, x, v);
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}
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/* Write a 4 byte value to memory. */
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static INLINE void
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wlat (sim_cpu *scpu, word pc, word x, word v)
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{
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address_word cia = CPU_PC_GET (scpu);
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sim_core_write_aligned_4 (scpu, cia, write_map, x, v);
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}
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/* Read 2 bytes from memory. */
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static INLINE int
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rsat (sim_cpu *scpu, word pc, word x)
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{
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address_word cia = CPU_PC_GET (scpu);
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return (sim_core_read_aligned_2 (scpu, cia, read_map, x));
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}
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/* Read 1 byte from memory. */
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static INLINE int
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rbat (sim_cpu *scpu, word pc, word x)
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{
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address_word cia = CPU_PC_GET (scpu);
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return (sim_core_read_aligned_1 (scpu, cia, read_map, x));
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}
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/* Read 4 bytes from memory. */
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static INLINE int
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rlat (sim_cpu *scpu, word pc, word x)
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{
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address_word cia = CPU_PC_GET (scpu);
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return (sim_core_read_aligned_4 (scpu, cia, read_map, x));
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}
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#define CHECK_FLAG(T,H) if (tflags & T) { hflags |= H; tflags ^= T; }
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static unsigned int
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convert_target_flags (unsigned int tflags)
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{
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unsigned int hflags = 0x0;
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CHECK_FLAG(0x0001, O_WRONLY);
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CHECK_FLAG(0x0002, O_RDWR);
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CHECK_FLAG(0x0008, O_APPEND);
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CHECK_FLAG(0x0200, O_CREAT);
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CHECK_FLAG(0x0400, O_TRUNC);
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CHECK_FLAG(0x0800, O_EXCL);
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CHECK_FLAG(0x2000, O_SYNC);
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if (tflags != 0x0)
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fprintf (stderr,
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"Simulator Error: problem converting target open flags for host. 0x%x\n",
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tflags);
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return hflags;
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}
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/* TODO: Split this up into finger trace levels than just insn. */
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#define MOXIE_TRACE_INSN(str) \
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TRACE_INSN (scpu, "0x%08x, %s, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x", \
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opc, str, cpu.asregs.regs[0], cpu.asregs.regs[1], \
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cpu.asregs.regs[2], cpu.asregs.regs[3], cpu.asregs.regs[4], \
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cpu.asregs.regs[5], cpu.asregs.regs[6], cpu.asregs.regs[7], \
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cpu.asregs.regs[8], cpu.asregs.regs[9], cpu.asregs.regs[10], \
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cpu.asregs.regs[11], cpu.asregs.regs[12], cpu.asregs.regs[13], \
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cpu.asregs.regs[14], cpu.asregs.regs[15])
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void
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sim_engine_run (SIM_DESC sd,
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int next_cpu_nr, /* ignore */
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int nr_cpus, /* ignore */
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int siggnal) /* ignore */
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{
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word pc, opc;
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unsigned short inst;
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sim_cpu *scpu = STATE_CPU (sd, 0); /* FIXME */
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address_word cia = CPU_PC_GET (scpu);
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pc = cpu.asregs.regs[PC_REGNO];
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/* Run instructions here. */
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do
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{
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opc = pc;
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/* Fetch the instruction at pc. */
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inst = (sim_core_read_aligned_1 (scpu, cia, read_map, pc) << 8)
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+ sim_core_read_aligned_1 (scpu, cia, read_map, pc+1);
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/* Decode instruction. */
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if (inst & (1 << 15))
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{
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if (inst & (1 << 14))
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{
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/* This is a Form 3 instruction. */
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int opcode = (inst >> 10 & 0xf);
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switch (opcode)
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{
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case 0x00: /* beq */
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{
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MOXIE_TRACE_INSN ("beq");
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if (cpu.asregs.cc & CC_EQ)
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pc += INST2OFFSET(inst);
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}
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break;
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case 0x01: /* bne */
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{
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MOXIE_TRACE_INSN ("bne");
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if (! (cpu.asregs.cc & CC_EQ))
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pc += INST2OFFSET(inst);
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}
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break;
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case 0x02: /* blt */
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{
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MOXIE_TRACE_INSN ("blt");
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if (cpu.asregs.cc & CC_LT)
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pc += INST2OFFSET(inst);
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} break;
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case 0x03: /* bgt */
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{
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MOXIE_TRACE_INSN ("bgt");
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if (cpu.asregs.cc & CC_GT)
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pc += INST2OFFSET(inst);
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}
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break;
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case 0x04: /* bltu */
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{
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MOXIE_TRACE_INSN ("bltu");
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if (cpu.asregs.cc & CC_LTU)
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pc += INST2OFFSET(inst);
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}
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break;
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case 0x05: /* bgtu */
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{
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MOXIE_TRACE_INSN ("bgtu");
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if (cpu.asregs.cc & CC_GTU)
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pc += INST2OFFSET(inst);
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}
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break;
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case 0x06: /* bge */
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{
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MOXIE_TRACE_INSN ("bge");
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if (cpu.asregs.cc & (CC_GT | CC_EQ))
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pc += INST2OFFSET(inst);
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}
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break;
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case 0x07: /* ble */
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{
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MOXIE_TRACE_INSN ("ble");
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if (cpu.asregs.cc & (CC_LT | CC_EQ))
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pc += INST2OFFSET(inst);
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}
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break;
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case 0x08: /* bgeu */
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{
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MOXIE_TRACE_INSN ("bgeu");
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if (cpu.asregs.cc & (CC_GTU | CC_EQ))
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pc += INST2OFFSET(inst);
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}
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break;
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case 0x09: /* bleu */
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{
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MOXIE_TRACE_INSN ("bleu");
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if (cpu.asregs.cc & (CC_LTU | CC_EQ))
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pc += INST2OFFSET(inst);
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}
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break;
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default:
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{
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MOXIE_TRACE_INSN ("SIGILL3");
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sim_engine_halt (sd, scpu, NULL, pc, sim_stopped, SIM_SIGILL);
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break;
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}
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}
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}
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else
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{
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/* This is a Form 2 instruction. */
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int opcode = (inst >> 12 & 0x3);
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switch (opcode)
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{
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case 0x00: /* inc */
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{
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int a = (inst >> 8) & 0xf;
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unsigned av = cpu.asregs.regs[a];
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unsigned v = (inst & 0xff);
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MOXIE_TRACE_INSN ("inc");
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cpu.asregs.regs[a] = av + v;
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}
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break;
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case 0x01: /* dec */
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{
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int a = (inst >> 8) & 0xf;
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unsigned av = cpu.asregs.regs[a];
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unsigned v = (inst & 0xff);
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MOXIE_TRACE_INSN ("dec");
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cpu.asregs.regs[a] = av - v;
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}
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break;
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case 0x02: /* gsr */
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{
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int a = (inst >> 8) & 0xf;
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unsigned v = (inst & 0xff);
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MOXIE_TRACE_INSN ("gsr");
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cpu.asregs.regs[a] = cpu.asregs.sregs[v];
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}
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break;
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case 0x03: /* ssr */
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{
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int a = (inst >> 8) & 0xf;
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unsigned v = (inst & 0xff);
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MOXIE_TRACE_INSN ("ssr");
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cpu.asregs.sregs[v] = cpu.asregs.regs[a];
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}
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break;
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default:
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MOXIE_TRACE_INSN ("SIGILL2");
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sim_engine_halt (sd, scpu, NULL, pc, sim_stopped, SIM_SIGILL);
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break;
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}
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}
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}
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else
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{
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/* This is a Form 1 instruction. */
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int opcode = inst >> 8;
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switch (opcode)
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{
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case 0x00: /* bad */
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opc = opcode;
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MOXIE_TRACE_INSN ("SIGILL0");
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sim_engine_halt (sd, scpu, NULL, pc, sim_stopped, SIM_SIGILL);
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break;
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case 0x01: /* ldi.l (immediate) */
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{
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int reg = (inst >> 4) & 0xf;
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unsigned int val = EXTRACT_WORD(pc+2);
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MOXIE_TRACE_INSN ("ldi.l");
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cpu.asregs.regs[reg] = val;
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pc += 4;
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}
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break;
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case 0x02: /* mov (register-to-register) */
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{
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int dest = (inst >> 4) & 0xf;
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int src = (inst ) & 0xf;
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MOXIE_TRACE_INSN ("mov");
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cpu.asregs.regs[dest] = cpu.asregs.regs[src];
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}
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break;
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case 0x03: /* jsra */
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{
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unsigned int fn = EXTRACT_WORD(pc+2);
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unsigned int sp = cpu.asregs.regs[1];
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MOXIE_TRACE_INSN ("jsra");
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/* Save a slot for the static chain. */
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sp -= 4;
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/* Push the return address. */
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sp -= 4;
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wlat (scpu, opc, sp, pc + 6);
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/* Push the current frame pointer. */
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sp -= 4;
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wlat (scpu, opc, sp, cpu.asregs.regs[0]);
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/* Uncache the stack pointer and set the pc and $fp. */
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cpu.asregs.regs[1] = sp;
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cpu.asregs.regs[0] = sp;
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pc = fn - 2;
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}
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break;
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case 0x04: /* ret */
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{
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unsigned int sp = cpu.asregs.regs[0];
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MOXIE_TRACE_INSN ("ret");
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/* Pop the frame pointer. */
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cpu.asregs.regs[0] = rlat (scpu, opc, sp);
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sp += 4;
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/* Pop the return address. */
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pc = rlat (scpu, opc, sp) - 2;
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sp += 4;
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/* Skip over the static chain slot. */
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sp += 4;
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/* Uncache the stack pointer. */
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cpu.asregs.regs[1] = sp;
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}
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break;
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case 0x05: /* add.l */
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{
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int a = (inst >> 4) & 0xf;
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int b = inst & 0xf;
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unsigned av = cpu.asregs.regs[a];
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unsigned bv = cpu.asregs.regs[b];
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MOXIE_TRACE_INSN ("add.l");
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cpu.asregs.regs[a] = av + bv;
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}
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break;
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case 0x06: /* push */
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{
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int a = (inst >> 4) & 0xf;
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int b = inst & 0xf;
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int sp = cpu.asregs.regs[a] - 4;
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MOXIE_TRACE_INSN ("push");
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wlat (scpu, opc, sp, cpu.asregs.regs[b]);
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cpu.asregs.regs[a] = sp;
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}
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break;
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case 0x07: /* pop */
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{
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int a = (inst >> 4) & 0xf;
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int b = inst & 0xf;
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int sp = cpu.asregs.regs[a];
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MOXIE_TRACE_INSN ("pop");
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cpu.asregs.regs[b] = rlat (scpu, opc, sp);
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cpu.asregs.regs[a] = sp + 4;
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}
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break;
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case 0x08: /* lda.l */
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{
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int reg = (inst >> 4) & 0xf;
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unsigned int addr = EXTRACT_WORD(pc+2);
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MOXIE_TRACE_INSN ("lda.l");
|
|
cpu.asregs.regs[reg] = rlat (scpu, opc, addr);
|
|
pc += 4;
|
|
}
|
|
break;
|
|
case 0x09: /* sta.l */
|
|
{
|
|
int reg = (inst >> 4) & 0xf;
|
|
unsigned int addr = EXTRACT_WORD(pc+2);
|
|
|
|
MOXIE_TRACE_INSN ("sta.l");
|
|
wlat (scpu, opc, addr, cpu.asregs.regs[reg]);
|
|
pc += 4;
|
|
}
|
|
break;
|
|
case 0x0a: /* ld.l (register indirect) */
|
|
{
|
|
int src = inst & 0xf;
|
|
int dest = (inst >> 4) & 0xf;
|
|
int xv;
|
|
|
|
MOXIE_TRACE_INSN ("ld.l");
|
|
xv = cpu.asregs.regs[src];
|
|
cpu.asregs.regs[dest] = rlat (scpu, opc, xv);
|
|
}
|
|
break;
|
|
case 0x0b: /* st.l */
|
|
{
|
|
int dest = (inst >> 4) & 0xf;
|
|
int val = inst & 0xf;
|
|
|
|
MOXIE_TRACE_INSN ("st.l");
|
|
wlat (scpu, opc, cpu.asregs.regs[dest], cpu.asregs.regs[val]);
|
|
}
|
|
break;
|
|
case 0x0c: /* ldo.l */
|
|
{
|
|
unsigned int addr = EXTRACT_OFFSET(pc+2);
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
|
|
MOXIE_TRACE_INSN ("ldo.l");
|
|
addr += cpu.asregs.regs[b];
|
|
cpu.asregs.regs[a] = rlat (scpu, opc, addr);
|
|
pc += 2;
|
|
}
|
|
break;
|
|
case 0x0d: /* sto.l */
|
|
{
|
|
unsigned int addr = EXTRACT_OFFSET(pc+2);
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
|
|
MOXIE_TRACE_INSN ("sto.l");
|
|
addr += cpu.asregs.regs[a];
|
|
wlat (scpu, opc, addr, cpu.asregs.regs[b]);
|
|
pc += 2;
|
|
}
|
|
break;
|
|
case 0x0e: /* cmp */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
int cc = 0;
|
|
int va = cpu.asregs.regs[a];
|
|
int vb = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("cmp");
|
|
if (va == vb)
|
|
cc = CC_EQ;
|
|
else
|
|
{
|
|
cc |= (va < vb ? CC_LT : 0);
|
|
cc |= (va > vb ? CC_GT : 0);
|
|
cc |= ((unsigned int) va < (unsigned int) vb ? CC_LTU : 0);
|
|
cc |= ((unsigned int) va > (unsigned int) vb ? CC_GTU : 0);
|
|
}
|
|
|
|
cpu.asregs.cc = cc;
|
|
}
|
|
break;
|
|
case 0x0f: /* nop */
|
|
break;
|
|
case 0x10: /* sex.b */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
signed char bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("sex.b");
|
|
cpu.asregs.regs[a] = (int) bv;
|
|
}
|
|
break;
|
|
case 0x11: /* sex.s */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
signed short bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("sex.s");
|
|
cpu.asregs.regs[a] = (int) bv;
|
|
}
|
|
break;
|
|
case 0x12: /* zex.b */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
signed char bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("zex.b");
|
|
cpu.asregs.regs[a] = (int) bv & 0xff;
|
|
}
|
|
break;
|
|
case 0x13: /* zex.s */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
signed short bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("zex.s");
|
|
cpu.asregs.regs[a] = (int) bv & 0xffff;
|
|
}
|
|
break;
|
|
case 0x14: /* umul.x */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
unsigned av = cpu.asregs.regs[a];
|
|
unsigned bv = cpu.asregs.regs[b];
|
|
unsigned long long r =
|
|
(unsigned long long) av * (unsigned long long) bv;
|
|
|
|
MOXIE_TRACE_INSN ("umul.x");
|
|
cpu.asregs.regs[a] = r >> 32;
|
|
}
|
|
break;
|
|
case 0x15: /* mul.x */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
unsigned av = cpu.asregs.regs[a];
|
|
unsigned bv = cpu.asregs.regs[b];
|
|
signed long long r =
|
|
(signed long long) av * (signed long long) bv;
|
|
|
|
MOXIE_TRACE_INSN ("mul.x");
|
|
cpu.asregs.regs[a] = r >> 32;
|
|
}
|
|
break;
|
|
case 0x16: /* bad */
|
|
case 0x17: /* bad */
|
|
case 0x18: /* bad */
|
|
{
|
|
opc = opcode;
|
|
MOXIE_TRACE_INSN ("SIGILL0");
|
|
sim_engine_halt (sd, scpu, NULL, pc, sim_stopped, SIM_SIGILL);
|
|
break;
|
|
}
|
|
case 0x19: /* jsr */
|
|
{
|
|
unsigned int fn = cpu.asregs.regs[(inst >> 4) & 0xf];
|
|
unsigned int sp = cpu.asregs.regs[1];
|
|
|
|
MOXIE_TRACE_INSN ("jsr");
|
|
|
|
/* Save a slot for the static chain. */
|
|
sp -= 4;
|
|
|
|
/* Push the return address. */
|
|
sp -= 4;
|
|
wlat (scpu, opc, sp, pc + 2);
|
|
|
|
/* Push the current frame pointer. */
|
|
sp -= 4;
|
|
wlat (scpu, opc, sp, cpu.asregs.regs[0]);
|
|
|
|
/* Uncache the stack pointer and set the fp & pc. */
|
|
cpu.asregs.regs[1] = sp;
|
|
cpu.asregs.regs[0] = sp;
|
|
pc = fn - 2;
|
|
}
|
|
break;
|
|
case 0x1a: /* jmpa */
|
|
{
|
|
unsigned int tgt = EXTRACT_WORD(pc+2);
|
|
|
|
MOXIE_TRACE_INSN ("jmpa");
|
|
pc = tgt - 2;
|
|
}
|
|
break;
|
|
case 0x1b: /* ldi.b (immediate) */
|
|
{
|
|
int reg = (inst >> 4) & 0xf;
|
|
unsigned int val = EXTRACT_WORD(pc+2);
|
|
|
|
MOXIE_TRACE_INSN ("ldi.b");
|
|
cpu.asregs.regs[reg] = val;
|
|
pc += 4;
|
|
}
|
|
break;
|
|
case 0x1c: /* ld.b (register indirect) */
|
|
{
|
|
int src = inst & 0xf;
|
|
int dest = (inst >> 4) & 0xf;
|
|
int xv;
|
|
|
|
MOXIE_TRACE_INSN ("ld.b");
|
|
xv = cpu.asregs.regs[src];
|
|
cpu.asregs.regs[dest] = rbat (scpu, opc, xv);
|
|
}
|
|
break;
|
|
case 0x1d: /* lda.b */
|
|
{
|
|
int reg = (inst >> 4) & 0xf;
|
|
unsigned int addr = EXTRACT_WORD(pc+2);
|
|
|
|
MOXIE_TRACE_INSN ("lda.b");
|
|
cpu.asregs.regs[reg] = rbat (scpu, opc, addr);
|
|
pc += 4;
|
|
}
|
|
break;
|
|
case 0x1e: /* st.b */
|
|
{
|
|
int dest = (inst >> 4) & 0xf;
|
|
int val = inst & 0xf;
|
|
|
|
MOXIE_TRACE_INSN ("st.b");
|
|
wbat (scpu, opc, cpu.asregs.regs[dest], cpu.asregs.regs[val]);
|
|
}
|
|
break;
|
|
case 0x1f: /* sta.b */
|
|
{
|
|
int reg = (inst >> 4) & 0xf;
|
|
unsigned int addr = EXTRACT_WORD(pc+2);
|
|
|
|
MOXIE_TRACE_INSN ("sta.b");
|
|
wbat (scpu, opc, addr, cpu.asregs.regs[reg]);
|
|
pc += 4;
|
|
}
|
|
break;
|
|
case 0x20: /* ldi.s (immediate) */
|
|
{
|
|
int reg = (inst >> 4) & 0xf;
|
|
|
|
unsigned int val = EXTRACT_WORD(pc+2);
|
|
|
|
MOXIE_TRACE_INSN ("ldi.s");
|
|
cpu.asregs.regs[reg] = val;
|
|
pc += 4;
|
|
}
|
|
break;
|
|
case 0x21: /* ld.s (register indirect) */
|
|
{
|
|
int src = inst & 0xf;
|
|
int dest = (inst >> 4) & 0xf;
|
|
int xv;
|
|
|
|
MOXIE_TRACE_INSN ("ld.s");
|
|
xv = cpu.asregs.regs[src];
|
|
cpu.asregs.regs[dest] = rsat (scpu, opc, xv);
|
|
}
|
|
break;
|
|
case 0x22: /* lda.s */
|
|
{
|
|
int reg = (inst >> 4) & 0xf;
|
|
unsigned int addr = EXTRACT_WORD(pc+2);
|
|
|
|
MOXIE_TRACE_INSN ("lda.s");
|
|
cpu.asregs.regs[reg] = rsat (scpu, opc, addr);
|
|
pc += 4;
|
|
}
|
|
break;
|
|
case 0x23: /* st.s */
|
|
{
|
|
int dest = (inst >> 4) & 0xf;
|
|
int val = inst & 0xf;
|
|
|
|
MOXIE_TRACE_INSN ("st.s");
|
|
wsat (scpu, opc, cpu.asregs.regs[dest], cpu.asregs.regs[val]);
|
|
}
|
|
break;
|
|
case 0x24: /* sta.s */
|
|
{
|
|
int reg = (inst >> 4) & 0xf;
|
|
unsigned int addr = EXTRACT_WORD(pc+2);
|
|
|
|
MOXIE_TRACE_INSN ("sta.s");
|
|
wsat (scpu, opc, addr, cpu.asregs.regs[reg]);
|
|
pc += 4;
|
|
}
|
|
break;
|
|
case 0x25: /* jmp */
|
|
{
|
|
int reg = (inst >> 4) & 0xf;
|
|
|
|
MOXIE_TRACE_INSN ("jmp");
|
|
pc = cpu.asregs.regs[reg] - 2;
|
|
}
|
|
break;
|
|
case 0x26: /* and */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
int av, bv;
|
|
|
|
MOXIE_TRACE_INSN ("and");
|
|
av = cpu.asregs.regs[a];
|
|
bv = cpu.asregs.regs[b];
|
|
cpu.asregs.regs[a] = av & bv;
|
|
}
|
|
break;
|
|
case 0x27: /* lshr */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
int av = cpu.asregs.regs[a];
|
|
int bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("lshr");
|
|
cpu.asregs.regs[a] = (unsigned) ((unsigned) av >> bv);
|
|
}
|
|
break;
|
|
case 0x28: /* ashl */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
int av = cpu.asregs.regs[a];
|
|
int bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("ashl");
|
|
cpu.asregs.regs[a] = av << bv;
|
|
}
|
|
break;
|
|
case 0x29: /* sub.l */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
unsigned av = cpu.asregs.regs[a];
|
|
unsigned bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("sub.l");
|
|
cpu.asregs.regs[a] = av - bv;
|
|
}
|
|
break;
|
|
case 0x2a: /* neg */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
int bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("neg");
|
|
cpu.asregs.regs[a] = - bv;
|
|
}
|
|
break;
|
|
case 0x2b: /* or */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
int av, bv;
|
|
|
|
MOXIE_TRACE_INSN ("or");
|
|
av = cpu.asregs.regs[a];
|
|
bv = cpu.asregs.regs[b];
|
|
cpu.asregs.regs[a] = av | bv;
|
|
}
|
|
break;
|
|
case 0x2c: /* not */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
int bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("not");
|
|
cpu.asregs.regs[a] = 0xffffffff ^ bv;
|
|
}
|
|
break;
|
|
case 0x2d: /* ashr */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
int av = cpu.asregs.regs[a];
|
|
int bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("ashr");
|
|
cpu.asregs.regs[a] = av >> bv;
|
|
}
|
|
break;
|
|
case 0x2e: /* xor */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
int av, bv;
|
|
|
|
MOXIE_TRACE_INSN ("xor");
|
|
av = cpu.asregs.regs[a];
|
|
bv = cpu.asregs.regs[b];
|
|
cpu.asregs.regs[a] = av ^ bv;
|
|
}
|
|
break;
|
|
case 0x2f: /* mul.l */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
unsigned av = cpu.asregs.regs[a];
|
|
unsigned bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("mul.l");
|
|
cpu.asregs.regs[a] = av * bv;
|
|
}
|
|
break;
|
|
case 0x30: /* swi */
|
|
{
|
|
unsigned int inum = EXTRACT_WORD(pc+2);
|
|
|
|
MOXIE_TRACE_INSN ("swi");
|
|
/* Set the special registers appropriately. */
|
|
cpu.asregs.sregs[2] = 3; /* MOXIE_EX_SWI */
|
|
cpu.asregs.sregs[3] = inum;
|
|
switch (inum)
|
|
{
|
|
case 0x1: /* SYS_exit */
|
|
{
|
|
sim_engine_halt (sd, scpu, NULL, pc, sim_exited,
|
|
cpu.asregs.regs[2]);
|
|
break;
|
|
}
|
|
case 0x2: /* SYS_open */
|
|
{
|
|
char fname[1024];
|
|
int mode = (int) convert_target_flags ((unsigned) cpu.asregs.regs[3]);
|
|
int perm = (int) cpu.asregs.regs[4];
|
|
int fd = open (fname, mode, perm);
|
|
sim_core_read_buffer (sd, scpu, read_map, fname,
|
|
cpu.asregs.regs[2], 1024);
|
|
/* FIXME - set errno */
|
|
cpu.asregs.regs[2] = fd;
|
|
break;
|
|
}
|
|
case 0x4: /* SYS_read */
|
|
{
|
|
int fd = cpu.asregs.regs[2];
|
|
unsigned len = (unsigned) cpu.asregs.regs[4];
|
|
char *buf = malloc (len);
|
|
cpu.asregs.regs[2] = read (fd, buf, len);
|
|
sim_core_write_buffer (sd, scpu, write_map, buf,
|
|
cpu.asregs.regs[3], len);
|
|
free (buf);
|
|
break;
|
|
}
|
|
case 0x5: /* SYS_write */
|
|
{
|
|
char *str;
|
|
/* String length is at 0x12($fp) */
|
|
unsigned count, len = (unsigned) cpu.asregs.regs[4];
|
|
str = malloc (len);
|
|
sim_core_read_buffer (sd, scpu, read_map, str,
|
|
cpu.asregs.regs[3], len);
|
|
count = write (cpu.asregs.regs[2], str, len);
|
|
free (str);
|
|
cpu.asregs.regs[2] = count;
|
|
break;
|
|
}
|
|
case 0xffffffff: /* Linux System Call */
|
|
{
|
|
unsigned int handler = cpu.asregs.sregs[1];
|
|
unsigned int sp = cpu.asregs.regs[1];
|
|
|
|
/* Save a slot for the static chain. */
|
|
sp -= 4;
|
|
|
|
/* Push the return address. */
|
|
sp -= 4;
|
|
wlat (scpu, opc, sp, pc + 6);
|
|
|
|
/* Push the current frame pointer. */
|
|
sp -= 4;
|
|
wlat (scpu, opc, sp, cpu.asregs.regs[0]);
|
|
|
|
/* Uncache the stack pointer and set the fp & pc. */
|
|
cpu.asregs.regs[1] = sp;
|
|
cpu.asregs.regs[0] = sp;
|
|
pc = handler - 6;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
pc += 4;
|
|
}
|
|
break;
|
|
case 0x31: /* div.l */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
int av = cpu.asregs.regs[a];
|
|
int bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("div.l");
|
|
cpu.asregs.regs[a] = av / bv;
|
|
}
|
|
break;
|
|
case 0x32: /* udiv.l */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
unsigned int av = cpu.asregs.regs[a];
|
|
unsigned int bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("udiv.l");
|
|
cpu.asregs.regs[a] = (av / bv);
|
|
}
|
|
break;
|
|
case 0x33: /* mod.l */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
int av = cpu.asregs.regs[a];
|
|
int bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("mod.l");
|
|
cpu.asregs.regs[a] = av % bv;
|
|
}
|
|
break;
|
|
case 0x34: /* umod.l */
|
|
{
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
unsigned int av = cpu.asregs.regs[a];
|
|
unsigned int bv = cpu.asregs.regs[b];
|
|
|
|
MOXIE_TRACE_INSN ("umod.l");
|
|
cpu.asregs.regs[a] = (av % bv);
|
|
}
|
|
break;
|
|
case 0x35: /* brk */
|
|
MOXIE_TRACE_INSN ("brk");
|
|
sim_engine_halt (sd, scpu, NULL, pc, sim_stopped, SIM_SIGTRAP);
|
|
pc -= 2; /* Adjust pc */
|
|
break;
|
|
case 0x36: /* ldo.b */
|
|
{
|
|
unsigned int addr = EXTRACT_OFFSET(pc+2);
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
|
|
MOXIE_TRACE_INSN ("ldo.b");
|
|
addr += cpu.asregs.regs[b];
|
|
cpu.asregs.regs[a] = rbat (scpu, opc, addr);
|
|
pc += 2;
|
|
}
|
|
break;
|
|
case 0x37: /* sto.b */
|
|
{
|
|
unsigned int addr = EXTRACT_OFFSET(pc+2);
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
|
|
MOXIE_TRACE_INSN ("sto.b");
|
|
addr += cpu.asregs.regs[a];
|
|
wbat (scpu, opc, addr, cpu.asregs.regs[b]);
|
|
pc += 2;
|
|
}
|
|
break;
|
|
case 0x38: /* ldo.s */
|
|
{
|
|
unsigned int addr = EXTRACT_OFFSET(pc+2);
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
|
|
MOXIE_TRACE_INSN ("ldo.s");
|
|
addr += cpu.asregs.regs[b];
|
|
cpu.asregs.regs[a] = rsat (scpu, opc, addr);
|
|
pc += 2;
|
|
}
|
|
break;
|
|
case 0x39: /* sto.s */
|
|
{
|
|
unsigned int addr = EXTRACT_OFFSET(pc+2);
|
|
int a = (inst >> 4) & 0xf;
|
|
int b = inst & 0xf;
|
|
|
|
MOXIE_TRACE_INSN ("sto.s");
|
|
addr += cpu.asregs.regs[a];
|
|
wsat (scpu, opc, addr, cpu.asregs.regs[b]);
|
|
pc += 2;
|
|
}
|
|
break;
|
|
default:
|
|
opc = opcode;
|
|
MOXIE_TRACE_INSN ("SIGILL1");
|
|
sim_engine_halt (sd, scpu, NULL, pc, sim_stopped, SIM_SIGILL);
|
|
break;
|
|
}
|
|
}
|
|
|
|
cpu.asregs.insts++;
|
|
pc += 2;
|
|
cpu.asregs.regs[PC_REGNO] = pc;
|
|
|
|
if (sim_events_tick (sd))
|
|
sim_events_process (sd);
|
|
|
|
} while (1);
|
|
}
|
|
|
|
static int
|
|
moxie_reg_store (SIM_CPU *scpu, int rn, unsigned char *memory, int length)
|
|
{
|
|
if (rn < NUM_MOXIE_REGS && rn >= 0)
|
|
{
|
|
if (length == 4)
|
|
{
|
|
long ival;
|
|
|
|
/* misalignment safe */
|
|
ival = moxie_extract_unsigned_integer (memory, 4);
|
|
cpu.asints[rn] = ival;
|
|
}
|
|
|
|
return 4;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
moxie_reg_fetch (SIM_CPU *scpu, int rn, unsigned char *memory, int length)
|
|
{
|
|
if (rn < NUM_MOXIE_REGS && rn >= 0)
|
|
{
|
|
if (length == 4)
|
|
{
|
|
long ival = cpu.asints[rn];
|
|
|
|
/* misalignment-safe */
|
|
moxie_store_unsigned_integer (memory, 4, ival);
|
|
}
|
|
|
|
return 4;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static sim_cia
|
|
moxie_pc_get (sim_cpu *cpu)
|
|
{
|
|
return cpu->registers[PCIDX];
|
|
}
|
|
|
|
static void
|
|
moxie_pc_set (sim_cpu *cpu, sim_cia pc)
|
|
{
|
|
cpu->registers[PCIDX] = pc;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
SIM_DESC
|
|
sim_open (SIM_OPEN_KIND kind, host_callback *cb,
|
|
struct bfd *abfd, char * const *argv)
|
|
{
|
|
int i;
|
|
SIM_DESC sd = sim_state_alloc (kind, cb);
|
|
SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
|
|
|
|
/* The cpu data is kept in a separately allocated chunk of memory. */
|
|
if (sim_cpu_alloc_all (sd, 1, /*cgen_cpu_max_extra_bytes ()*/0) != SIM_RC_OK)
|
|
{
|
|
free_state (sd);
|
|
return 0;
|
|
}
|
|
|
|
STATE_WATCHPOINTS (sd)->pc = &cpu.asregs.regs[PC_REGNO];
|
|
STATE_WATCHPOINTS (sd)->sizeof_pc = sizeof (word);
|
|
|
|
if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
|
|
{
|
|
free_state (sd);
|
|
return 0;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
sim_do_command(sd," memory region 0x00000000,0x4000000") ;
|
|
sim_do_command(sd," memory region 0xE0000000,0x10000") ;
|
|
|
|
/* Check for/establish the a reference program image. */
|
|
if (sim_analyze_program (sd,
|
|
(STATE_PROG_ARGV (sd) != NULL
|
|
? *STATE_PROG_ARGV (sd)
|
|
: NULL), 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_FETCH (cpu) = moxie_reg_fetch;
|
|
CPU_REG_STORE (cpu) = moxie_reg_store;
|
|
CPU_PC_FETCH (cpu) = moxie_pc_get;
|
|
CPU_PC_STORE (cpu) = moxie_pc_set;
|
|
|
|
set_initial_gprs (); /* Reset the GPR registers. */
|
|
}
|
|
|
|
return sd;
|
|
}
|
|
|
|
/* Load the device tree blob. */
|
|
|
|
static void
|
|
load_dtb (SIM_DESC sd, const char *filename)
|
|
{
|
|
int size = 0;
|
|
FILE *f = fopen (filename, "rb");
|
|
char *buf;
|
|
sim_cpu *scpu = STATE_CPU (sd, 0); /* FIXME */
|
|
|
|
/* Don't warn as the sim works fine w/out a device tree. */
|
|
if (f == NULL)
|
|
return;
|
|
fseek (f, 0, SEEK_END);
|
|
size = ftell(f);
|
|
fseek (f, 0, SEEK_SET);
|
|
buf = alloca (size);
|
|
if (size != fread (buf, 1, size, f))
|
|
{
|
|
sim_io_eprintf (sd, "ERROR: error reading ``%s''.\n", filename);
|
|
fclose (f);
|
|
return;
|
|
}
|
|
sim_core_write_buffer (sd, scpu, write_map, buf, 0xE0000000, size);
|
|
cpu.asregs.sregs[9] = 0xE0000000;
|
|
fclose (f);
|
|
}
|
|
|
|
SIM_RC
|
|
sim_create_inferior (SIM_DESC sd, struct bfd *prog_bfd,
|
|
char * const *argv, char * const *env)
|
|
{
|
|
char ** avp;
|
|
int l, argc, i, tp;
|
|
sim_cpu *scpu = STATE_CPU (sd, 0); /* FIXME */
|
|
|
|
if (prog_bfd != NULL)
|
|
cpu.asregs.regs[PC_REGNO] = bfd_get_start_address (prog_bfd);
|
|
|
|
/* Copy args into target memory. */
|
|
avp = argv;
|
|
for (argc = 0; avp && *avp; avp++)
|
|
argc++;
|
|
|
|
/* Target memory looks like this:
|
|
0x00000000 zero word
|
|
0x00000004 argc word
|
|
0x00000008 start of argv
|
|
.
|
|
0x0000???? end of argv
|
|
0x0000???? zero word
|
|
0x0000???? start of data pointed to by argv */
|
|
|
|
wlat (scpu, 0, 0, 0);
|
|
wlat (scpu, 0, 4, argc);
|
|
|
|
/* tp is the offset of our first argv data. */
|
|
tp = 4 + 4 + argc * 4 + 4;
|
|
|
|
for (i = 0; i < argc; i++)
|
|
{
|
|
/* Set the argv value. */
|
|
wlat (scpu, 0, 4 + 4 + i * 4, tp);
|
|
|
|
/* Store the string. */
|
|
sim_core_write_buffer (sd, scpu, write_map, argv[i],
|
|
tp, strlen(argv[i])+1);
|
|
tp += strlen (argv[i]) + 1;
|
|
}
|
|
|
|
wlat (scpu, 0, 4 + 4 + i * 4, 0);
|
|
|
|
load_dtb (sd, DTB);
|
|
|
|
return SIM_RC_OK;
|
|
}
|