Re: [Qemu-devel] [PATCH 4/5 v3][RESEND] ppc: Add software breakpoint support

[Madhavan Srinivasan <maddy@linux.vnet.ibm.com>]

On Tuesday 24 June 2014 05:40 PM, Bharat Bhushan wrote:
> This patch allow insert/remove software breakpoint
> 
> Signed-off-by: Bharat Bhushan <Bharat.Bhushan@freescale.com>
> ---
>  target-ppc/kvm.c | 71 +++++++++++++++++++++++++++++++++++++++++++++-----------
>  1 file changed, 57 insertions(+), 14 deletions(-)
> 
> diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
> index 5238de7..8e2dbb3 100644
> --- a/target-ppc/kvm.c
> +++ b/target-ppc/kvm.c
> @@ -1317,6 +1317,53 @@ 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, 4, 0) ||
> +        cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&sc, 4, 1)) {

Instead of hard coding, can we use sizeof ()?

> +        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, 4, 0) ||
> +        sc != debug_inst_opcode ||
> +        cpu_memory_rw_debug(cs, bp->pc, (uint8_t *)&bp->saved_insn, 4, 1)) {
> +        return -EINVAL;
> +    }
> +

Same. Can we use sizeof?

> +    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);
> +    struct kvm_debug_exit_arch *arch_info = &run->debug.arch;
> +    int handle = 0;
> +
> +    if (kvm_find_sw_breakpoint(cs, arch_info->address)) {
> +        handle = 1;
> +    }
> +
> +    return handle;
> +}
> +
>  int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
>  {
>      PowerPCCPU *cpu = POWERPC_CPU(cs);
> @@ -1357,6 +1404,16 @@ 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 */

Kindly can you explain when this will happen?

> +        ret = 0;
> +        break;
> +
>      default:
>          fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason);
>          ret = -1;
> @@ -2044,16 +2101,6 @@ 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;
> @@ -2068,10 +2115,6 @@ 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;
>      /*
>