diff options
Diffstat (limited to 'target-ppc')
| -rw-r--r-- | target-ppc/kvm.c | 93 |
1 files changed, 79 insertions, 14 deletions
diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c index 05d2ac8..c29ed65 100644 --- a/target-ppc/kvm.c +++ b/target-ppc/kvm.c @@ -1275,6 +1275,75 @@ static int kvmppc_handle_dcr_write(CPUPPCState *env, uint32_t dcrn, uint32_t dat return 0; } +int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp) +{ + /* Mixed endian case is not handled */ + uint32_t sc = debug_inst_opcode; + + if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, + sizeof(sc), 0) || + cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&sc, sizeof(sc), 1)) { + return -EINVAL; + } + + return 0; +} + +int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp) +{ + uint32_t sc; + + if (cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&sc, sizeof(sc), 0) || + sc != debug_inst_opcode || + cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, + sizeof(sc), 1)) { + return -EINVAL; + } + + return 0; +} + +void kvm_arch_update_guest_debug(CPUState *cs, struct kvm_guest_debug *dbg) +{ + /* Software Breakpoint updates */ + if (kvm_sw_breakpoints_active(cs)) { + dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP; + } +} + +static int kvm_handle_debug(PowerPCCPU *cpu, struct kvm_run *run) +{ + CPUState *cs = CPU(cpu); + CPUPPCState *env = &cpu->env; + struct kvm_debug_exit_arch *arch_info = &run->debug.arch; + int handle = 0; + + if (kvm_find_sw_breakpoint(cs, arch_info->address)) { + handle = 1; + } else { + /* QEMU is not able to handle debug exception, so inject + * program exception to guest; + * Yes program exception NOT debug exception !! + * For software breakpoint QEMU uses a privileged instruction; + * So there cannot be any reason that we are here for guest + * set debug exception, only possibility is guest executed a + * privileged / illegal instruction and that's why we are + * injecting a program interrupt. + */ + + cpu_synchronize_state(cs); + /* env->nip is PC, so increment this by 4 to use + * ppc_cpu_do_interrupt(), which set srr0 = env->nip - 4. + */ + env->nip += 4; + cs->exception_index = POWERPC_EXCP_PROGRAM; + env->error_code = POWERPC_EXCP_INVAL; + ppc_cpu_do_interrupt(cs); + } + + return handle; +} + int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run) { PowerPCCPU *cpu = POWERPC_CPU(cs); @@ -1315,6 +1384,16 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run) ret = 0; break; + case KVM_EXIT_DEBUG: + DPRINTF("handle debug exception\n"); + if (kvm_handle_debug(cpu, run)) { + ret = EXCP_DEBUG; + break; + } + /* re-enter, this exception was guest-internal */ + ret = 0; + break; + default: fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason); ret = -1; @@ -2007,16 +2086,6 @@ void kvm_arch_init_irq_routing(KVMState *s) { } -int kvm_arch_insert_sw_breakpoint(CPUState *cpu, struct kvm_sw_breakpoint *bp) -{ - return -EINVAL; -} - -int kvm_arch_remove_sw_breakpoint(CPUState *cpu, struct kvm_sw_breakpoint *bp) -{ - return -EINVAL; -} - int kvm_arch_insert_hw_breakpoint(target_ulong addr, target_ulong len, int type) { return -EINVAL; @@ -2031,10 +2100,6 @@ void kvm_arch_remove_all_hw_breakpoints(void) { } -void kvm_arch_update_guest_debug(CPUState *cpu, struct kvm_guest_debug *dbg) -{ -} - struct kvm_get_htab_buf { struct kvm_get_htab_header header; /* |