| /* Simulation code for the CR16 processor. |
| Copyright (C) 2008-2023 Free Software Foundation, Inc. |
| Contributed by M Ranga Swami Reddy <MR.Swami.Reddy@nsc.com> |
| |
| 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, 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 <inttypes.h> |
| #include <signal.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include "bfd.h" |
| #include "sim/callback.h" |
| #include "sim/sim.h" |
| |
| #include "sim-main.h" |
| #include "sim-options.h" |
| #include "sim-signal.h" |
| |
| #include "sim/sim-cr16.h" |
| #include "gdb/signals.h" |
| #include "opcode/cr16.h" |
| |
| #include "target-newlib-syscall.h" |
| |
| #include "cr16-sim.h" |
| |
| struct _state State; |
| |
| int cr16_debug; |
| |
| uint32_t OP[4]; |
| uint32_t sign_flag; |
| |
| static struct hash_entry *lookup_hash (SIM_DESC, SIM_CPU *, uint64_t ins, int size); |
| static void get_operands (operand_desc *s, uint64_t mcode, int isize, int nops); |
| |
| #define MAX_HASH 16 |
| |
| struct hash_entry |
| { |
| struct hash_entry *next; |
| uint32_t opcode; |
| uint32_t mask; |
| int format; |
| int size; |
| struct simops *ops; |
| }; |
| |
| struct hash_entry hash_table[MAX_HASH+1]; |
| |
| INLINE static long |
| hash(unsigned long long insn, int format) |
| { |
| unsigned int i = 4, tmp; |
| if (format) |
| { |
| while ((insn >> i) != 0) i +=4; |
| |
| return ((insn >> (i-4)) & 0xf); /* Use last 4 bits as hask key. */ |
| } |
| return ((insn & 0xF)); /* Use last 4 bits as hask key. */ |
| } |
| |
| |
| INLINE static struct hash_entry * |
| lookup_hash (SIM_DESC sd, SIM_CPU *cpu, uint64_t ins, int size) |
| { |
| uint32_t mask; |
| struct hash_entry *h; |
| |
| h = &hash_table[hash(ins,1)]; |
| |
| |
| mask = (((1 << (32 - h->mask)) -1) << h->mask); |
| |
| /* Adjuest mask for branch with 2 word instructions. */ |
| if (streq(h->ops->mnemonic,"b") && h->size == 2) |
| mask = 0xff0f0000; |
| |
| |
| while ((ins & mask) != (BIN(h->opcode, h->mask))) |
| { |
| if (h->next == NULL) |
| sim_engine_halt (sd, cpu, NULL, PC, sim_stopped, SIM_SIGILL); |
| h = h->next; |
| |
| mask = (((1 << (32 - h->mask)) -1) << h->mask); |
| /* Adjuest mask for branch with 2 word instructions. */ |
| if ((streq(h->ops->mnemonic,"b")) && h->size == 2) |
| mask = 0xff0f0000; |
| |
| } |
| return (h); |
| } |
| |
| INLINE static void |
| get_operands (operand_desc *s, uint64_t ins, int isize, int nops) |
| { |
| uint32_t i, opn = 0, start_bit = 0, op_type = 0; |
| int32_t op_size = 0, mask = 0; |
| |
| if (isize == 1) /* Trunkcate the extra 16 bits of INS. */ |
| ins = ins >> 16; |
| |
| for (i=0; i < 4; ++i,++opn) |
| { |
| if (s[opn].op_type == dummy) break; |
| |
| op_type = s[opn].op_type; |
| start_bit = s[opn].shift; |
| op_size = cr16_optab[op_type].bit_size; |
| |
| switch (op_type) |
| { |
| case imm3: case imm4: case imm5: case imm6: |
| { |
| if (isize == 1) |
| OP[i] = ((ins >> 4) & ((1 << op_size) -1)); |
| else |
| OP[i] = ((ins >> (32 - start_bit)) & ((1 << op_size) -1)); |
| |
| if (OP[i] & ((long)1 << (op_size -1))) |
| { |
| sign_flag = 1; |
| OP[i] = ~(OP[i]) + 1; |
| } |
| OP[i] = (unsigned long int)(OP[i] & (((long)1 << op_size) -1)); |
| } |
| break; |
| |
| case uimm3: case uimm3_1: case uimm4_1: |
| switch (isize) |
| { |
| case 1: |
| OP[i] = ((ins >> 4) & ((1 << op_size) -1)); break; |
| case 2: |
| OP[i] = ((ins >> (32 - start_bit)) & ((1 << op_size) -1));break; |
| default: /* for case 3. */ |
| OP[i] = ((ins >> (16 + start_bit)) & ((1 << op_size) -1)); break; |
| break; |
| } |
| break; |
| |
| case uimm4: |
| switch (isize) |
| { |
| case 1: |
| if (start_bit == 20) |
| OP[i] = ((ins >> 4) & ((1 << op_size) -1)); |
| else |
| OP[i] = (ins & ((1 << op_size) -1)); |
| break; |
| case 2: |
| OP[i] = ((ins >> start_bit) & ((1 << op_size) -1)); |
| break; |
| case 3: |
| OP[i] = ((ins >> (start_bit + 16)) & ((1 << op_size) -1)); |
| break; |
| default: |
| OP[i] = ((ins >> start_bit) & ((1 << op_size) -1)); |
| break; |
| } |
| break; |
| |
| case imm16: case uimm16: |
| OP[i] = ins & 0xFFFF; |
| break; |
| |
| case uimm20: case imm20: |
| OP[i] = ins & (((long)1 << op_size) - 1); |
| break; |
| |
| case imm32: case uimm32: |
| OP[i] = ins & 0xFFFFFFFF; |
| break; |
| |
| case uimm5: break; /*NOT USED. */ |
| OP[i] = ins & ((1 << op_size) - 1); break; |
| |
| case disps5: |
| OP[i] = (ins >> 4) & ((1 << 4) - 1); |
| OP[i] = (OP[i] * 2) + 2; |
| if (OP[i] & ((long)1 << 5)) |
| { |
| sign_flag = 1; |
| OP[i] = ~(OP[i]) + 1; |
| OP[i] = (unsigned long int)(OP[i] & 0x1F); |
| } |
| break; |
| |
| case dispe9: |
| OP[i] = ((((ins >> 8) & 0xf) << 4) | (ins & 0xf)); |
| OP[i] <<= 1; |
| if (OP[i] & ((long)1 << 8)) |
| { |
| sign_flag = 1; |
| OP[i] = ~(OP[i]) + 1; |
| OP[i] = (unsigned long int)(OP[i] & 0xFF); |
| } |
| break; |
| |
| case disps17: |
| OP[i] = (ins & 0xFFFF); |
| if (OP[i] & 1) |
| { |
| OP[i] = (OP[i] & 0xFFFE); |
| sign_flag = 1; |
| OP[i] = ~(OP[i]) + 1; |
| OP[i] = (unsigned long int)(OP[i] & 0xFFFF); |
| } |
| break; |
| |
| case disps25: |
| if (isize == 2) |
| OP[i] = (ins & 0xFFFFFF); |
| else |
| OP[i] = (ins & 0xFFFF) | (((ins >> 24) & 0xf) << 16) | |
| (((ins >> 16) & 0xf) << 20); |
| |
| if (OP[i] & 1) |
| { |
| OP[i] = (OP[i] & 0xFFFFFE); |
| sign_flag = 1; |
| OP[i] = ~(OP[i]) + 1; |
| OP[i] = (unsigned long int)(OP[i] & 0xFFFFFF); |
| } |
| break; |
| |
| case abs20: |
| if (isize == 3) |
| OP[i] = (ins) & 0xFFFFF; |
| else |
| OP[i] = (ins >> start_bit) & 0xFFFFF; |
| break; |
| case abs24: |
| if (isize == 3) |
| OP[i] = ((ins & 0xFFFF) | (((ins >> 16) & 0xf) << 20) |
| | (((ins >> 24) & 0xf) << 16)); |
| else |
| OP[i] = (ins >> 16) & 0xFFFFFF; |
| break; |
| |
| case rra: |
| case rbase: break; /* NOT USED. */ |
| case rbase_disps20: case rbase_dispe20: |
| case rpbase_disps20: case rpindex_disps20: |
| OP[i] = ((((ins >> 24)&0xf) << 16)|((ins) & 0xFFFF)); |
| OP[++i] = (ins >> 16) & 0xF; /* get 4 bit for reg. */ |
| break; |
| case rpbase_disps0: |
| OP[i] = 0; /* 4 bit disp const. */ |
| OP[++i] = (ins) & 0xF; /* get 4 bit for reg. */ |
| break; |
| case rpbase_dispe4: |
| OP[i] = ((ins >> 8) & 0xF) * 2; /* 4 bit disp const. */ |
| OP[++i] = (ins) & 0xF; /* get 4 bit for reg. */ |
| break; |
| case rpbase_disps4: |
| OP[i] = ((ins >> 8) & 0xF); /* 4 bit disp const. */ |
| OP[++i] = (ins) & 0xF; /* get 4 bit for reg. */ |
| break; |
| case rpbase_disps16: |
| OP[i] = (ins) & 0xFFFF; |
| OP[++i] = (ins >> 16) & 0xF; /* get 4 bit for reg. */ |
| break; |
| case rpindex_disps0: |
| OP[i] = 0; |
| OP[++i] = (ins >> 4) & 0xF; /* get 4 bit for reg. */ |
| OP[++i] = (ins >> 8) & 0x1; /* get 1 bit for index-reg. */ |
| break; |
| case rpindex_disps14: |
| OP[i] = (ins) & 0x3FFF; |
| OP[++i] = (ins >> 14) & 0x1; /* get 1 bit for index-reg. */ |
| OP[++i] = (ins >> 16) & 0xF; /* get 4 bit for reg. */ |
| case rindex7_abs20: |
| case rindex8_abs20: |
| OP[i] = (ins) & 0xFFFFF; |
| OP[++i] = (ins >> 24) & 0x1; /* get 1 bit for index-reg. */ |
| OP[++i] = (ins >> 20) & 0xF; /* get 4 bit for reg. */ |
| break; |
| case regr: case regp: case pregr: case pregrp: |
| switch(isize) |
| { |
| case 1: |
| if (start_bit == 20) OP[i] = (ins >> 4) & 0xF; |
| else if (start_bit == 16) OP[i] = ins & 0xF; |
| break; |
| case 2: OP[i] = (ins >> start_bit) & 0xF; break; |
| case 3: OP[i] = (ins >> (start_bit + 16)) & 0xF; break; |
| } |
| break; |
| case cc: |
| { |
| if (isize == 1) OP[i] = (ins >> 4) & 0xF; |
| else if (isize == 2) OP[i] = (ins >> start_bit) & 0xF; |
| else OP[i] = (ins >> (start_bit + 16)) & 0xF; |
| break; |
| } |
| default: break; |
| } |
| |
| /* For ESC on uimm4_1 operand. */ |
| if (op_type == uimm4_1) |
| if (OP[i] == 9) |
| OP[i] = -1; |
| |
| /* For increment by 1. */ |
| if ((op_type == pregr) || (op_type == pregrp)) |
| OP[i] += 1; |
| } |
| /* FIXME: for tracing, update values that need to be updated each |
| instruction decode cycle */ |
| State.trace.psw = PSR; |
| } |
| |
| static int |
| do_run (SIM_DESC sd, SIM_CPU *cpu, uint64_t mcode) |
| { |
| struct hash_entry *h; |
| |
| #ifdef DEBUG |
| if ((cr16_debug & DEBUG_INSTRUCTION) != 0) |
| sim_io_printf (sd, "do_long 0x%" PRIx64 "\n", mcode); |
| #endif |
| |
| h = lookup_hash (sd, cpu, mcode, 1); |
| |
| if ((h == NULL) || (h->opcode == 0)) |
| return 0; |
| |
| if (h->size == 3) |
| mcode = (mcode << 16) | RW (PC + 4); |
| |
| /* Re-set OP list. */ |
| OP[0] = OP[1] = OP[2] = OP[3] = sign_flag = 0; |
| |
| /* for push/pop/pushrtn with RA instructions. */ |
| if ((h->format & REG_LIST) && (mcode & 0x800000)) |
| OP[2] = 1; /* Set 1 for RA operand. */ |
| |
| /* numops == 0 means, no operands. */ |
| if (((h->ops) != NULL) && (((h->ops)->numops) != 0)) |
| get_operands ((h->ops)->operands, mcode, h->size, (h->ops)->numops); |
| |
| //State.ins_type = h->flags; |
| |
| (h->ops->func) (sd, cpu); |
| |
| return h->size; |
| } |
| |
| static sim_cia |
| cr16_pc_get (sim_cpu *cpu) |
| { |
| return PC; |
| } |
| |
| static void |
| cr16_pc_set (sim_cpu *cpu, sim_cia pc) |
| { |
| SIM_DESC sd = CPU_STATE (cpu); |
| SET_PC (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); |
| } |
| |
| static int cr16_reg_fetch (SIM_CPU *, int, void *, int); |
| static int cr16_reg_store (SIM_CPU *, int, const void *, int); |
| |
| SIM_DESC |
| sim_open (SIM_OPEN_KIND kind, struct host_callback_struct *cb, |
| struct bfd *abfd, char * const *argv) |
| { |
| struct simops *s; |
| struct hash_entry *h; |
| static int init_p = 0; |
| char **p; |
| int i; |
| SIM_DESC sd = sim_state_alloc (kind, cb); |
| SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); |
| |
| /* Set default options before parsing user options. */ |
| current_target_byte_order = BFD_ENDIAN_LITTLE; |
| cb->syscall_map = cb_cr16_syscall_map; |
| |
| /* The cpu data is kept in a separately allocated chunk of memory. */ |
| if (sim_cpu_alloc_all (sd, 0) != SIM_RC_OK) |
| { |
| free_state (sd); |
| return 0; |
| } |
| |
| 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; |
| } |
| |
| /* Check for/establish the 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_FETCH (cpu) = cr16_reg_fetch; |
| CPU_REG_STORE (cpu) = cr16_reg_store; |
| CPU_PC_FETCH (cpu) = cr16_pc_get; |
| CPU_PC_STORE (cpu) = cr16_pc_set; |
| } |
| |
| /* The CR16 has an interrupt controller at 0xFC00, but we don't currently |
| handle that. Revisit if anyone ever implements operating mode. */ |
| /* cr16 memory: There are three separate cr16 memory regions IMEM, |
| UMEM and DMEM. The IMEM and DMEM are further broken down into |
| blocks (very like VM pages). This might not match the hardware, |
| but it matches what the toolchain currently expects. Ugh. */ |
| sim_do_commandf (sd, "memory-size %#x", 20 * 1024 * 1024); |
| |
| /* put all the opcodes in the hash table. */ |
| if (!init_p++) |
| { |
| for (s = Simops; s->func; s++) |
| { |
| switch(32 - s->mask) |
| { |
| case 0x4: |
| h = &hash_table[hash(s->opcode, 0)]; |
| break; |
| |
| case 0x7: |
| if (((s->opcode << 1) >> 4) != 0) |
| h = &hash_table[hash((s->opcode << 1) >> 4, 0)]; |
| else |
| h = &hash_table[hash((s->opcode << 1), 0)]; |
| break; |
| |
| case 0x8: |
| if ((s->opcode >> 4) != 0) |
| h = &hash_table[hash(s->opcode >> 4, 0)]; |
| else |
| h = &hash_table[hash(s->opcode, 0)]; |
| break; |
| |
| case 0x9: |
| if (((s->opcode >> 1) >> 4) != 0) |
| h = &hash_table[hash((s->opcode >>1) >> 4, 0)]; |
| else |
| h = &hash_table[hash((s->opcode >> 1), 0)]; |
| break; |
| |
| case 0xa: |
| if ((s->opcode >> 8) != 0) |
| h = &hash_table[hash(s->opcode >> 8, 0)]; |
| else if ((s->opcode >> 4) != 0) |
| h = &hash_table[hash(s->opcode >> 4, 0)]; |
| else |
| h = &hash_table[hash(s->opcode, 0)]; |
| break; |
| |
| case 0xc: |
| if ((s->opcode >> 8) != 0) |
| h = &hash_table[hash(s->opcode >> 8, 0)]; |
| else if ((s->opcode >> 4) != 0) |
| h = &hash_table[hash(s->opcode >> 4, 0)]; |
| else |
| h = &hash_table[hash(s->opcode, 0)]; |
| break; |
| |
| case 0xd: |
| if (((s->opcode >> 1) >> 8) != 0) |
| h = &hash_table[hash((s->opcode >>1) >> 8, 0)]; |
| else if (((s->opcode >> 1) >> 4) != 0) |
| h = &hash_table[hash((s->opcode >>1) >> 4, 0)]; |
| else |
| h = &hash_table[hash((s->opcode >>1), 0)]; |
| break; |
| |
| case 0x10: |
| if ((s->opcode >> 0xc) != 0) |
| h = &hash_table[hash(s->opcode >> 12, 0)]; |
| else if ((s->opcode >> 8) != 0) |
| h = &hash_table[hash(s->opcode >> 8, 0)]; |
| else if ((s->opcode >> 4) != 0) |
| h = &hash_table[hash(s->opcode >> 4, 0)]; |
| else |
| h = &hash_table[hash(s->opcode, 0)]; |
| break; |
| |
| case 0x14: |
| if ((s->opcode >> 16) != 0) |
| h = &hash_table[hash(s->opcode >> 16, 0)]; |
| else if ((s->opcode >> 12) != 0) |
| h = &hash_table[hash(s->opcode >> 12, 0)]; |
| else if ((s->opcode >> 8) != 0) |
| h = &hash_table[hash(s->opcode >> 8, 0)]; |
| else if ((s->opcode >> 4) != 0) |
| h = &hash_table[hash(s->opcode >> 4, 0)]; |
| else |
| h = &hash_table[hash(s->opcode, 0)]; |
| break; |
| |
| default: |
| continue; |
| } |
| |
| /* go to the last entry in the chain. */ |
| while (h->next) |
| h = h->next; |
| |
| if (h->ops) |
| { |
| h->next = (struct hash_entry *) calloc(1,sizeof(struct hash_entry)); |
| if (!h->next) |
| perror ("malloc failure"); |
| |
| h = h->next; |
| } |
| h->ops = s; |
| h->mask = s->mask; |
| h->opcode = s->opcode; |
| h->format = s->format; |
| h->size = s->size; |
| } |
| } |
| |
| return sd; |
| } |
| |
| static void |
| step_once (SIM_DESC sd, SIM_CPU *cpu) |
| { |
| uint32_t curr_ins_size = 0; |
| uint64_t mcode = RLW (PC); |
| |
| State.pc_changed = 0; |
| |
| curr_ins_size = do_run (sd, cpu, mcode); |
| |
| #if CR16_DEBUG |
| sim_io_printf (sd, "INS: PC=0x%X, mcode=0x%X\n", PC, mcode); |
| #endif |
| |
| if (curr_ins_size == 0) |
| sim_engine_halt (sd, cpu, NULL, PC, sim_exited, GPR (2)); |
| else if (!State.pc_changed) |
| SET_PC (PC + (curr_ins_size * 2)); /* For word instructions. */ |
| |
| #if 0 |
| /* Check for a breakpoint trap on this instruction. This |
| overrides any pending branches or loops */ |
| if (PSR_DB && PC == DBS) |
| { |
| SET_BPC (PC); |
| SET_BPSR (PSR); |
| SET_PC (SDBT_VECTOR_START); |
| } |
| #endif |
| |
| /* Writeback all the DATA / PC changes */ |
| SLOT_FLUSH (); |
| } |
| |
| void |
| sim_engine_run (SIM_DESC sd, |
| int next_cpu_nr, /* ignore */ |
| int nr_cpus, /* ignore */ |
| int siggnal) |
| { |
| sim_cpu *cpu; |
| |
| SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); |
| |
| cpu = STATE_CPU (sd, 0); |
| |
| switch (siggnal) |
| { |
| case 0: |
| break; |
| case GDB_SIGNAL_BUS: |
| case GDB_SIGNAL_SEGV: |
| SET_PC (PC); |
| SET_PSR (PSR); |
| JMP (AE_VECTOR_START); |
| SLOT_FLUSH (); |
| break; |
| case GDB_SIGNAL_ILL: |
| SET_PC (PC); |
| SET_PSR (PSR); |
| SET_HW_PSR ((PSR & (PSR_C_BIT))); |
| JMP (RIE_VECTOR_START); |
| SLOT_FLUSH (); |
| break; |
| default: |
| /* just ignore it */ |
| break; |
| } |
| |
| while (1) |
| { |
| step_once (sd, cpu); |
| if (sim_events_tick (sd)) |
| sim_events_process (sd); |
| } |
| } |
| |
| SIM_RC |
| sim_create_inferior (SIM_DESC sd, struct bfd *abfd, |
| char * const *argv, char * const *env) |
| { |
| bfd_vma start_address; |
| |
| /* reset all state information */ |
| memset (&State, 0, sizeof (State)); |
| |
| /* There was a hack here to copy the values of argc and argv into r0 |
| and r1. The values were also saved into some high memory that |
| won't be overwritten by the stack (0x7C00). The reason for doing |
| this was to allow the 'run' program to accept arguments. Without |
| the hack, this is not possible anymore. If the simulator is run |
| from the debugger, arguments cannot be passed in, so this makes |
| no difference. */ |
| |
| /* set PC */ |
| if (abfd != NULL) |
| start_address = bfd_get_start_address (abfd); |
| else |
| start_address = 0x0; |
| #ifdef DEBUG |
| if (cr16_debug) |
| sim_io_printf (sd, "sim_create_inferior: PC=0x%" PRIx64 "\n", |
| (uint64_t) start_address); |
| #endif |
| { |
| SIM_CPU *cpu = STATE_CPU (sd, 0); |
| SET_CREG (PC_CR, start_address); |
| } |
| |
| SLOT_FLUSH (); |
| return SIM_RC_OK; |
| } |
| |
| static uint32_t |
| cr16_extract_unsigned_integer (const unsigned char *addr, int len) |
| { |
| uint32_t retval; |
| unsigned char * p; |
| unsigned char * startaddr = (unsigned char *)addr; |
| unsigned char * endaddr = startaddr + len; |
| |
| retval = 0; |
| |
| for (p = endaddr; p > startaddr;) |
| retval = (retval << 8) | *--p; |
| |
| return retval; |
| } |
| |
| static void |
| cr16_store_unsigned_integer (unsigned char *addr, int len, uint32_t val) |
| { |
| unsigned char *p; |
| unsigned char *startaddr = addr; |
| unsigned char *endaddr = startaddr + len; |
| |
| for (p = startaddr; p < endaddr;) |
| { |
| *p++ = val & 0xff; |
| val >>= 8; |
| } |
| } |
| |
| static int |
| cr16_reg_fetch (SIM_CPU *cpu, int rn, void *memory, int length) |
| { |
| int size; |
| switch ((enum sim_cr16_regs) rn) |
| { |
| case SIM_CR16_R0_REGNUM: |
| case SIM_CR16_R1_REGNUM: |
| case SIM_CR16_R2_REGNUM: |
| case SIM_CR16_R3_REGNUM: |
| case SIM_CR16_R4_REGNUM: |
| case SIM_CR16_R5_REGNUM: |
| case SIM_CR16_R6_REGNUM: |
| case SIM_CR16_R7_REGNUM: |
| case SIM_CR16_R8_REGNUM: |
| case SIM_CR16_R9_REGNUM: |
| case SIM_CR16_R10_REGNUM: |
| case SIM_CR16_R11_REGNUM: |
| cr16_store_unsigned_integer (memory, 2, GPR (rn - SIM_CR16_R0_REGNUM)); |
| size = 2; |
| break; |
| case SIM_CR16_R12_REGNUM: |
| case SIM_CR16_R13_REGNUM: |
| case SIM_CR16_R14_REGNUM: |
| case SIM_CR16_R15_REGNUM: |
| cr16_store_unsigned_integer (memory, 4, GPR (rn - SIM_CR16_R0_REGNUM)); |
| size = 4; |
| break; |
| case SIM_CR16_PC_REGNUM: |
| case SIM_CR16_ISP_REGNUM: |
| case SIM_CR16_USP_REGNUM: |
| case SIM_CR16_INTBASE_REGNUM: |
| case SIM_CR16_PSR_REGNUM: |
| case SIM_CR16_CFG_REGNUM: |
| case SIM_CR16_DBS_REGNUM: |
| case SIM_CR16_DCR_REGNUM: |
| case SIM_CR16_DSR_REGNUM: |
| case SIM_CR16_CAR0_REGNUM: |
| case SIM_CR16_CAR1_REGNUM: |
| cr16_store_unsigned_integer (memory, 4, CREG (rn - SIM_CR16_PC_REGNUM)); |
| size = 4; |
| break; |
| default: |
| size = 0; |
| break; |
| } |
| return size; |
| } |
| |
| static int |
| cr16_reg_store (SIM_CPU *cpu, int rn, const void *memory, int length) |
| { |
| SIM_DESC sd = CPU_STATE (cpu); |
| int size; |
| switch ((enum sim_cr16_regs) rn) |
| { |
| case SIM_CR16_R0_REGNUM: |
| case SIM_CR16_R1_REGNUM: |
| case SIM_CR16_R2_REGNUM: |
| case SIM_CR16_R3_REGNUM: |
| case SIM_CR16_R4_REGNUM: |
| case SIM_CR16_R5_REGNUM: |
| case SIM_CR16_R6_REGNUM: |
| case SIM_CR16_R7_REGNUM: |
| case SIM_CR16_R8_REGNUM: |
| case SIM_CR16_R9_REGNUM: |
| case SIM_CR16_R10_REGNUM: |
| case SIM_CR16_R11_REGNUM: |
| SET_GPR (rn - SIM_CR16_R0_REGNUM, cr16_extract_unsigned_integer (memory, 2)); |
| size = 2; |
| break; |
| case SIM_CR16_R12_REGNUM: |
| case SIM_CR16_R13_REGNUM: |
| case SIM_CR16_R14_REGNUM: |
| case SIM_CR16_R15_REGNUM: |
| SET_GPR32 (rn - SIM_CR16_R0_REGNUM, cr16_extract_unsigned_integer (memory, 2)); |
| size = 4; |
| break; |
| case SIM_CR16_PC_REGNUM: |
| case SIM_CR16_ISP_REGNUM: |
| case SIM_CR16_USP_REGNUM: |
| case SIM_CR16_INTBASE_REGNUM: |
| case SIM_CR16_PSR_REGNUM: |
| case SIM_CR16_CFG_REGNUM: |
| case SIM_CR16_DBS_REGNUM: |
| case SIM_CR16_DCR_REGNUM: |
| case SIM_CR16_DSR_REGNUM: |
| case SIM_CR16_CAR0_REGNUM: |
| case SIM_CR16_CAR1_REGNUM: |
| SET_CREG (rn - SIM_CR16_PC_REGNUM, cr16_extract_unsigned_integer (memory, 4)); |
| size = 4; |
| break; |
| default: |
| size = 0; |
| break; |
| } |
| SLOT_FLUSH (); |
| return size; |
| } |
