Commit 8c32a2ea authored by Bharat Bhushan's avatar Bharat Bhushan Committed by Alexander Graf
Browse files

Added ONE_REG interface for debug instruction



This patch adds the one_reg interface to get the special instruction
to be used for setting software breakpoint from userspace.
Signed-off-by: default avatarBharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent fca7567c
...@@ -458,6 +458,8 @@ static inline bool kvmppc_critical_section(struct kvm_vcpu *vcpu) ...@@ -458,6 +458,8 @@ static inline bool kvmppc_critical_section(struct kvm_vcpu *vcpu)
#define OSI_SC_MAGIC_R4 0x77810F9B #define OSI_SC_MAGIC_R4 0x77810F9B
#define INS_DCBZ 0x7c0007ec #define INS_DCBZ 0x7c0007ec
/* TO = 31 for unconditional trap */
#define INS_TW 0x7fe00008
/* LPIDs we support with this build -- runtime limit may be lower */ /* LPIDs we support with this build -- runtime limit may be lower */
#define KVMPPC_NR_LPIDS (LPID_RSVD + 1) #define KVMPPC_NR_LPIDS (LPID_RSVD + 1)
......
...@@ -26,6 +26,8 @@ ...@@ -26,6 +26,8 @@
/* LPIDs we support with this build -- runtime limit may be lower */ /* LPIDs we support with this build -- runtime limit may be lower */
#define KVMPPC_NR_LPIDS 64 #define KVMPPC_NR_LPIDS 64
#define KVMPPC_INST_EHPRIV 0x7c00021c
static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val) static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val)
{ {
vcpu->arch.gpr[num] = val; vcpu->arch.gpr[num] = val;
......
...@@ -422,4 +422,8 @@ struct kvm_get_htab_header { ...@@ -422,4 +422,8 @@ struct kvm_get_htab_header {
#define KVM_REG_PPC_CLEAR_TSR (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x88) #define KVM_REG_PPC_CLEAR_TSR (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x88)
#define KVM_REG_PPC_TCR (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x89) #define KVM_REG_PPC_TCR (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x89)
#define KVM_REG_PPC_TSR (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x8a) #define KVM_REG_PPC_TSR (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x8a)
/* Debugging: Special instruction for software breakpoint */
#define KVM_REG_PPC_DEBUG_INST (KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x8b)
#endif /* __LINUX_KVM_POWERPC_H */ #endif /* __LINUX_KVM_POWERPC_H */
...@@ -529,6 +529,12 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) ...@@ -529,6 +529,12 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
val = get_reg_val(reg->id, vcpu->arch.vscr.u[3]); val = get_reg_val(reg->id, vcpu->arch.vscr.u[3]);
break; break;
#endif /* CONFIG_ALTIVEC */ #endif /* CONFIG_ALTIVEC */
case KVM_REG_PPC_DEBUG_INST: {
u32 opcode = INS_TW;
r = copy_to_user((u32 __user *)(long)reg->addr,
&opcode, sizeof(u32));
break;
}
default: default:
r = -EINVAL; r = -EINVAL;
break; break;
......
...@@ -1447,6 +1447,12 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) ...@@ -1447,6 +1447,12 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
case KVM_REG_PPC_TSR: case KVM_REG_PPC_TSR:
r = put_user(vcpu->arch.tsr, (u32 __user *)(long)reg->addr); r = put_user(vcpu->arch.tsr, (u32 __user *)(long)reg->addr);
break; break;
case KVM_REG_PPC_DEBUG_INST: {
u32 opcode = KVMPPC_INST_EHPRIV;
r = copy_to_user((u32 __user *)(long)reg->addr,
&opcode, sizeof(u32));
break;
}
default: default:
break; break;
} }
......
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment