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Diffstat (limited to 'sim/i960/traps.c')
| -rw-r--r-- | sim/i960/traps.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/sim/i960/traps.c b/sim/i960/traps.c new file mode 100644 index 00000000000..5b62ca15574 --- /dev/null +++ b/sim/i960/traps.c @@ -0,0 +1,213 @@ +/* i960 exception, interrupt, and trap (EIT) support + Copyright (C) 1998, 1999 Free Software Foundation, Inc. + Contributed by Cygnus Solutions. + +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 2, 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, write to the Free Software Foundation, Inc., +59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include "sim-main.h" +#include "targ-vals.h" + +/* The semantic code invokes this for illegal (unrecognized) instructions. */ + +void +sim_engine_invalid_insn (SIM_CPU *current_cpu, IADDR cia) +{ + SIM_DESC sd = CPU_STATE (current_cpu); + +#if 0 + if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT) + { + h_bsm_set (current_cpu, h_sm_get (current_cpu)); + h_bie_set (current_cpu, h_ie_get (current_cpu)); + h_bcond_set (current_cpu, h_cond_get (current_cpu)); + /* sm not changed */ + h_ie_set (current_cpu, 0); + h_cond_set (current_cpu, 0); + + h_bpc_set (current_cpu, cia); + + sim_engine_restart (CPU_STATE (current_cpu), current_cpu, NULL, + EIT_RSVD_INSN_ADDR); + } + else +#endif + sim_engine_halt (sd, current_cpu, NULL, cia, sim_stopped, SIM_SIGILL); +} + +/* Process an address exception. */ + +void +i960_core_signal (SIM_DESC sd, SIM_CPU *current_cpu, sim_cia cia, + unsigned int map, int nr_bytes, address_word addr, + transfer_type transfer, sim_core_signals sig) +{ +#if 0 + if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT) + { + h_bsm_set (current_cpu, h_sm_get (current_cpu)); + h_bie_set (current_cpu, h_ie_get (current_cpu)); + h_bcond_set (current_cpu, h_cond_get (current_cpu)); + /* sm not changed */ + h_ie_set (current_cpu, 0); + h_cond_set (current_cpu, 0); + + h_bpc_set (current_cpu, cia); + + sim_engine_restart (CPU_STATE (current_cpu), current_cpu, NULL, + EIT_ADDR_EXCP_ADDR); + } + else +#endif + sim_core_signal (sd, current_cpu, cia, map, nr_bytes, addr, + transfer, sig); +} + +/* Read/write functions for system call interface. */ + +static int +syscall_read_mem (host_callback *cb, struct cb_syscall *sc, + unsigned long taddr, char *buf, int bytes) +{ + SIM_DESC sd = (SIM_DESC) sc->p1; + SIM_CPU *cpu = (SIM_CPU *) sc->p2; + + return sim_core_read_buffer (sd, cpu, read_map, buf, taddr, bytes); +} + +static int +syscall_write_mem (host_callback *cb, struct cb_syscall *sc, + unsigned long taddr, const char *buf, int bytes) +{ + SIM_DESC sd = (SIM_DESC) sc->p1; + SIM_CPU *cpu = (SIM_CPU *) sc->p2; + + return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes); +} + +/* Trap support. + The result is the pc address to continue at. + Preprocessing like saving the various registers has already been done. */ + +USI +i960_trap (SIM_CPU *current_cpu, PCADDR pc, int num) +{ + SIM_DESC sd = CPU_STATE (current_cpu); + host_callback *cb = STATE_CALLBACK (sd); + +#ifdef SIM_HAVE_BREAKPOINTS + /* Check for breakpoints "owned" by the simulator first, regardless + of --environment. */ + if (num == TRAP_BREAKPOINT) + { + /* First try sim-break.c. If it's a breakpoint the simulator "owns" + it doesn't return. Otherwise it returns and let's us try. */ + sim_handle_breakpoint (sd, current_cpu, pc); + /* Fall through. */ + } +#endif + +#if 0 + /* ??? wilson, don't know what this does. */ + if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT) + { + /* The new pc is the trap vector entry. + We assume there's a branch there to some handler. */ + USI new_pc = EIT_TRAP_BASE_ADDR + num * 4; + return new_pc; + } +#endif + + switch (num) + { + default: + case TRAP_SYSCALL : + { + CB_SYSCALL s; + + CB_SYSCALL_INIT (&s); + s.func = num; + s.arg1 = a_i960_h_gr_get (current_cpu, 16); + s.arg2 = a_i960_h_gr_get (current_cpu, 17); + s.arg3 = a_i960_h_gr_get (current_cpu, 18); + + if (s.func == TARGET_SYS_exit) + { + sim_engine_halt (sd, current_cpu, NULL, pc, sim_exited, s.arg1); + } + + s.p1 = (PTR) sd; + s.p2 = (PTR) current_cpu; + s.read_mem = syscall_read_mem; + s.write_mem = syscall_write_mem; + cb_syscall (cb, &s); + /* ??? This stuff is probably wrong, but libgloss doesn't look at + these values, so it shouldn't matter. */ + a_i960_h_gr_set (current_cpu, 18, s.errcode); + a_i960_h_gr_set (current_cpu, 16, s.result); + a_i960_h_gr_set (current_cpu, 17, s.result2); + break; + } + + case TRAP_BREAKPOINT: + sim_engine_halt (sd, current_cpu, NULL, NULL_CIA, + sim_stopped, SIM_SIGTRAP); + break; + +#if 0 + /* ??? wilson, don't know what this does. */ + default : + { + USI new_pc = EIT_TRAP_BASE_ADDR + num * 4; + return new_pc; + } +#endif + } + + /* Fake an "rte" insn. */ + /* FIXME: Should duplicate all of rte processing. */ + return (pc & -4) + 4; +} + +/* Breakpoint support. + The result is the pc address to continue at. */ +/* ??? This is an editted copy of the above. */ + +USI +i960_breakpoint (SIM_CPU *current_cpu, PCADDR pc) +{ + SIM_DESC sd = CPU_STATE (current_cpu); + host_callback *cb = STATE_CALLBACK (sd); + +#ifdef SIM_HAVE_BREAKPOINTS + /* Check for breakpoints "owned" by the simulator first, regardless + of --environment. */ + if (num == TRAP_BREAKPOINT) + { + /* First try sim-break.c. If it's a breakpoint the simulator "owns" + it doesn't return. Otherwise it returns and let's us try. */ + sim_handle_breakpoint (sd, current_cpu, pc); + /* Fall through. */ + } +#endif + + sim_engine_halt (sd, current_cpu, NULL, NULL_CIA, + sim_stopped, SIM_SIGTRAP); + + /* Fake an "rte" insn. */ + /* FIXME: Should duplicate all of rte processing. */ + return (pc & -4) + 4; +} |