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Diffstat (limited to 'sim/ppc/interrupts.c')
| -rw-r--r-- | sim/ppc/interrupts.c | 413 |
1 files changed, 413 insertions, 0 deletions
diff --git a/sim/ppc/interrupts.c b/sim/ppc/interrupts.c new file mode 100644 index 0000000..453ebdb --- /dev/null +++ b/sim/ppc/interrupts.c @@ -0,0 +1,413 @@ +/* This file is part of the program psim. + + Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au> + + 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 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, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + */ + + +#ifndef _INTERRUPTS_C_ +#define _INTERRUPTS_C_ + +#ifndef STATIC_INLINE_INTERRUPTS +#define STATIC_INLINE_INTERRUPTS STATIC_INLINE +#endif + +#include <signal.h> + +#include "cpu.h" +#include "idecode.h" +#include "os_emul.h" + + +/* Operating environment support code + + Unlike the VEA, the OEA must fully model the effect an interrupt + has on the processors state. + + Each function below return updated values for registers effected by + interrupts */ + + +STATIC_INLINE_INTERRUPTS msreg +interrupt_msr(msreg old_msr, + msreg msr_clear, + msreg msr_set) +{ + msreg msr_set_to_0 = (msr_branch_trace_enable + | msr_data_relocate + | msr_external_interrupt_enable + | msr_floating_point_exception_mode_0 + | msr_floating_point_exception_mode_1 + | msr_floating_point_available + | msr_instruction_relocate + | msr_power_management_enable + | msr_problem_state + | msr_recoverable_interrupt + | msr_single_step_trace_enable); + /* remember, in 32bit mode msr_64bit_mode is zero */ + msreg new_msr = ((((old_msr & ~msr_set_to_0) + | msr_64bit_mode) + & ~msr_clear) + | msr_set); + return new_msr; +} + + +STATIC_INLINE_INTERRUPTS msreg +interrupt_srr1(msreg old_msr, + msreg srr1_clear, + msreg srr1_set) +{ + spreg srr1_mask = (MASK(0,32) + | MASK(37, 41) + | MASK(48, 63)); + spreg srr1 = (old_msr & srr1_mask & ~srr1_clear) | srr1_set; + return srr1; +} + + +STATIC_INLINE_INTERRUPTS unsigned_word +interrupt_base_ea(msreg msr) +{ + if (msr & msr_interrupt_prefix) + return MASK(0, 43); + else + return 0; +} + + +/* finish off an interrupt for the OEA model, updating all registers + and forcing a restart of the processor */ + +STATIC_INLINE_INTERRUPTS unsigned_word +perform_oea_interrupt(cpu *processor, + unsigned_word cia, + unsigned_word vector_offset, + msreg msr_clear, + msreg msr_set, + msreg srr1_clear, + msreg srr1_set) +{ + msreg old_msr = MSR; + msreg new_msr = interrupt_msr(old_msr, msr_clear, msr_set); + unsigned_word nia; + if (!(old_msr & msr_recoverable_interrupt)) + error("perform_oea_interrupt() recoverable_interrupt bit clear, cia=0x%x, msr=0x%x\n", + cia, old_msr); + SRR0 = (spreg)(cia); + SRR1 = interrupt_srr1(old_msr, srr1_clear, srr1_set); + MSR = new_msr; + nia = interrupt_base_ea(new_msr) + vector_offset; + cpu_synchronize_context(processor); + return nia; +} + + +INLINE_INTERRUPTS void machine_check_interrupt +(cpu *processor, + unsigned_word cia) +{ + switch (CURRENT_ENVIRONMENT) { + + case USER_ENVIRONMENT: + case VIRTUAL_ENVIRONMENT: + error("%s - cia=0x%x\n", + "machine_check_interrupt", cia); + + case OPERATING_ENVIRONMENT: + cia = perform_oea_interrupt(processor, cia, 0x00200, 0, 0, 0, 0); + cpu_restart(processor, cia); + + default: + error("machine_check_interrupt() - internal error\n"); + + } +} + + +INLINE_INTERRUPTS void +data_storage_interrupt(cpu *processor, + unsigned_word cia, + unsigned_word ea, + storage_interrupt_reasons reason, + int is_store) +{ + switch (CURRENT_ENVIRONMENT) { + + case USER_ENVIRONMENT: + case VIRTUAL_ENVIRONMENT: + error("data_storage_interrupt() should not be called in VEA mode\n"); + + case OPERATING_ENVIRONMENT: + { + spreg direction = (is_store ? dsisr_store_operation : 0); + switch (reason) { + case direct_store_storage_interrupt: + DSISR = dsisr_direct_store_error_exception | direction; + break; + case hash_table_miss_storage_interrupt: + DSISR = dsisr_hash_table_or_dbat_miss | direction; + break; + case protection_violation_storage_interrupt: + DSISR = dsisr_protection_violation | direction; + break; + case earwax_violation_storage_interrupt: + DSISR = dsisr_earwax_violation | direction; + break; + case segment_table_miss_storage_interrupt: + DSISR = dsisr_segment_table_miss | direction; + break; + case earwax_disabled_storage_interrupt: + DSISR = dsisr_earwax_disabled | direction; + break; + default: + error("data_storage_interrupt: unknown reason %d\n", reason); + break; + } + DAR = (spreg)ea; + cia = perform_oea_interrupt(processor, cia, 0x00300, 0, 0, 0, 0); + cpu_restart(processor, cia); + } + + default: + error("data_storage_interrupt() - internal error\n"); + + } +} + + +INLINE_INTERRUPTS void +instruction_storage_interrupt(cpu *processor, + unsigned_word cia, + storage_interrupt_reasons reason) +{ + switch (CURRENT_ENVIRONMENT) { + + case USER_ENVIRONMENT: + case VIRTUAL_ENVIRONMENT: + error("instruction_storage_interrupt - cia=0x%x - not implemented\n", + cia); + + case OPERATING_ENVIRONMENT: + { + unsigned_word nia; + msreg srr1_set; + switch(reason) { + case hash_table_miss_storage_interrupt: + srr1_set = srr1_hash_table_or_ibat_miss; + break; + case direct_store_storage_interrupt: + srr1_set = srr1_direct_store_error_exception; + break; + case protection_violation_storage_interrupt: + srr1_set = srr1_protection_violation; + break; + case segment_table_miss_storage_interrupt: + srr1_set = srr1_segment_table_miss; + break; + default: + srr1_set = 0; + error("instruction_storage_interrupt: unknown reason %d\n", reason); + break; + } + cia = perform_oea_interrupt(processor, cia, 0x00400, 0, 0, 0, srr1_set); + cpu_restart(processor, cia); + } + + default: + error("instruction_storage_interrupt() - internal error\n"); + + } +} + + + +INLINE_INTERRUPTS void alignment_interrupt +(cpu *processor, + unsigned_word cia, + unsigned_word ra) +{ + switch (CURRENT_ENVIRONMENT) { + + case USER_ENVIRONMENT: + case VIRTUAL_ENVIRONMENT: + error("%s - cia=0x%x, ra=0x%x\n", + "alignment_interrupt", cia, ra); + + case OPERATING_ENVIRONMENT: + DAR = (spreg)ra; + DSISR = 0; /* FIXME */ + cia = perform_oea_interrupt(processor, cia, 0x00600, 0, 0, 0, 0); + cpu_restart(processor, cia); + + default: + error("alignment_interrupt() - internal error\n"); + + } +} + + + + +INLINE_INTERRUPTS void +program_interrupt(cpu *processor, + unsigned_word cia, + program_interrupt_reasons reason) +{ + switch (CURRENT_ENVIRONMENT) { + + case USER_ENVIRONMENT: + case VIRTUAL_ENVIRONMENT: + switch (reason) { + default: + error("%s - cia=0x%x, reason=%d - not implemented\n", + "program_interrupt", cia, reason); + } + + case OPERATING_ENVIRONMENT: + { + msreg srr1_set; + switch (reason) { + case illegal_instruction_program_interrupt: + srr1_set = srr1_illegal_instruction; + break; + case privileged_instruction_program_interrupt: + srr1_set = srr1_priviliged_instruction; + break; + case trap_program_interrupt: + srr1_set = srr1_trap; + break; + default: + srr1_set = 0; + error("program_interrupt - cia=0x%x, reason=%d(%s) - not implemented\n", + cia, reason); + } + cia = perform_oea_interrupt(processor, cia, 0x00700, 0, 0, 0, srr1_set); + cpu_restart(processor, cia); + } + + default: + error("program_interrupt() - internal error\n"); + + } +} + + +INLINE_INTERRUPTS void +floating_point_unavailable_interrupt(cpu *processor, + unsigned_word cia) +{ + switch (CURRENT_ENVIRONMENT) { + + case USER_ENVIRONMENT: + case VIRTUAL_ENVIRONMENT: + error("%s - cia=0x%x - not implemented\n", + "floating_point_unavailable_interrupt", cia); + + case OPERATING_ENVIRONMENT: + cia = perform_oea_interrupt(processor, cia, 0x00800, 0, 0, 0, 0); + cpu_restart(processor, cia); + + default: + error("floating_point_unavailable_interrupt() - internal error\n"); + + } +} + + +INLINE_INTERRUPTS void +system_call_interrupt(cpu *processor, + unsigned_word cia) +{ + switch (CURRENT_ENVIRONMENT) { + + case USER_ENVIRONMENT: + case VIRTUAL_ENVIRONMENT: + os_emul_call(processor, cia); + cpu_restart(processor, cia+4); + + case OPERATING_ENVIRONMENT: + cia = perform_oea_interrupt(processor, cia+4, 0x00c00, 0, 0, 0, 0); + cpu_restart(processor, cia); + + default: + error("system_call_interrupt() - internal error\n"); + + } +} + +INLINE_INTERRUPTS void +trace_interrupt(cpu *processor, + unsigned_word cia); + +INLINE_INTERRUPTS void +floating_point_assist_interrupt(cpu *processor, + unsigned_word cia) +{ + switch (CURRENT_ENVIRONMENT) { + + case USER_ENVIRONMENT: + case VIRTUAL_ENVIRONMENT: + error("%s - cia=0x%x - not implemented\n", + "floating_point_assist_interrupt", cia); + + case OPERATING_ENVIRONMENT: + cia = perform_oea_interrupt(processor, cia, 0x00e00, 0, 0, 0, 0); + cpu_restart(processor, cia); + + default: + error("floating_point_assist_interrupt() - internal error\n"); + + } +} + + + +/* handle an externally generated event */ + +INLINE_INTERRUPTS int +decrementer_interrupt(cpu *processor) +{ + if (cpu_registers(processor)->msr & msr_external_interrupt_enable) { + unsigned_word cia = cpu_get_program_counter(processor); + unsigned_word nia = perform_oea_interrupt(processor, + cia, 0x00900, 0, 0, 0, 0); + cpu_set_program_counter(processor, nia); + return 1; + } + else { + return 0; + } +} + +INLINE_INTERRUPTS int +external_interrupt(cpu *processor) +{ + if (cpu_registers(processor)->msr & msr_external_interrupt_enable) { + unsigned_word cia = cpu_get_program_counter(processor); + unsigned_word nia = perform_oea_interrupt(processor, + cia, 0x00500, 0, 0, 0, 0); + cpu_set_program_counter(processor, nia); + return 1; + } + else { + return 0; /* not delivered */ + } +} + + +#endif /* _INTERRUPTS_C_ */ |