| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License, version 2, as |
| * published by the Free Software Foundation. |
| * |
| * 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| * |
| * Copyright IBM Corp. 2007 |
| * |
| * Authors: Hollis Blanchard <hollisb@us.ibm.com> |
| */ |
| |
| #include <linux/jiffies.h> |
| #include <linux/timer.h> |
| #include <linux/types.h> |
| #include <linux/string.h> |
| #include <linux/kvm_host.h> |
| |
| #include <asm/reg.h> |
| #include <asm/time.h> |
| #include <asm/byteorder.h> |
| #include <asm/kvm_ppc.h> |
| #include <asm/disassemble.h> |
| |
| void kvmppc_emulate_dec(struct kvm_vcpu *vcpu) |
| { |
| if (vcpu->arch.tcr & TCR_DIE) { |
| /* The decrementer ticks at the same rate as the timebase, so |
| * that's how we convert the guest DEC value to the number of |
| * host ticks. */ |
| unsigned long nr_jiffies; |
| |
| nr_jiffies = vcpu->arch.dec / tb_ticks_per_jiffy; |
| mod_timer(&vcpu->arch.dec_timer, |
| get_jiffies_64() + nr_jiffies); |
| } else { |
| del_timer(&vcpu->arch.dec_timer); |
| } |
| } |
| |
| /* XXX to do: |
| * lhax |
| * lhaux |
| * lswx |
| * lswi |
| * stswx |
| * stswi |
| * lha |
| * lhau |
| * lmw |
| * stmw |
| * |
| * XXX is_bigendian should depend on MMU mapping or MSR[LE] |
| */ |
| /* XXX Should probably auto-generate instruction decoding for a particular core |
| * from opcode tables in the future. */ |
| int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu) |
| { |
| u32 inst = vcpu->arch.last_inst; |
| u32 ea; |
| int ra; |
| int rb; |
| int rs; |
| int rt; |
| int sprn; |
| enum emulation_result emulated = EMULATE_DONE; |
| int advance = 1; |
| |
| switch (get_op(inst)) { |
| case 3: /* trap */ |
| vcpu->arch.esr |= ESR_PTR; |
| kvmppc_core_queue_program(vcpu); |
| advance = 0; |
| break; |
| |
| case 31: |
| switch (get_xop(inst)) { |
| |
| case 23: /* lwzx */ |
| rt = get_rt(inst); |
| emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1); |
| break; |
| |
| case 87: /* lbzx */ |
| rt = get_rt(inst); |
| emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1); |
| break; |
| |
| case 151: /* stwx */ |
| rs = get_rs(inst); |
| emulated = kvmppc_handle_store(run, vcpu, |
| vcpu->arch.gpr[rs], |
| 4, 1); |
| break; |
| |
| case 215: /* stbx */ |
| rs = get_rs(inst); |
| emulated = kvmppc_handle_store(run, vcpu, |
| vcpu->arch.gpr[rs], |
| 1, 1); |
| break; |
| |
| case 247: /* stbux */ |
| rs = get_rs(inst); |
| ra = get_ra(inst); |
| rb = get_rb(inst); |
| |
| ea = vcpu->arch.gpr[rb]; |
| if (ra) |
| ea += vcpu->arch.gpr[ra]; |
| |
| emulated = kvmppc_handle_store(run, vcpu, |
| vcpu->arch.gpr[rs], |
| 1, 1); |
| vcpu->arch.gpr[rs] = ea; |
| break; |
| |
| case 279: /* lhzx */ |
| rt = get_rt(inst); |
| emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1); |
| break; |
| |
| case 311: /* lhzux */ |
| rt = get_rt(inst); |
| ra = get_ra(inst); |
| rb = get_rb(inst); |
| |
| ea = vcpu->arch.gpr[rb]; |
| if (ra) |
| ea += vcpu->arch.gpr[ra]; |
| |
| emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1); |
| vcpu->arch.gpr[ra] = ea; |
| break; |
| |
| case 339: /* mfspr */ |
| sprn = get_sprn(inst); |
| rt = get_rt(inst); |
| |
| switch (sprn) { |
| case SPRN_SRR0: |
| vcpu->arch.gpr[rt] = vcpu->arch.srr0; break; |
| case SPRN_SRR1: |
| vcpu->arch.gpr[rt] = vcpu->arch.srr1; break; |
| case SPRN_PVR: |
| vcpu->arch.gpr[rt] = vcpu->arch.pvr; break; |
| |
| /* Note: mftb and TBRL/TBWL are user-accessible, so |
| * the guest can always access the real TB anyways. |
| * In fact, we probably will never see these traps. */ |
| case SPRN_TBWL: |
| vcpu->arch.gpr[rt] = mftbl(); break; |
| case SPRN_TBWU: |
| vcpu->arch.gpr[rt] = mftbu(); break; |
| |
| case SPRN_SPRG0: |
| vcpu->arch.gpr[rt] = vcpu->arch.sprg0; break; |
| case SPRN_SPRG1: |
| vcpu->arch.gpr[rt] = vcpu->arch.sprg1; break; |
| case SPRN_SPRG2: |
| vcpu->arch.gpr[rt] = vcpu->arch.sprg2; break; |
| case SPRN_SPRG3: |
| vcpu->arch.gpr[rt] = vcpu->arch.sprg3; break; |
| /* Note: SPRG4-7 are user-readable, so we don't get |
| * a trap. */ |
| |
| default: |
| emulated = kvmppc_core_emulate_mfspr(vcpu, sprn, rt); |
| if (emulated == EMULATE_FAIL) { |
| printk("mfspr: unknown spr %x\n", sprn); |
| vcpu->arch.gpr[rt] = 0; |
| } |
| break; |
| } |
| break; |
| |
| case 407: /* sthx */ |
| rs = get_rs(inst); |
| ra = get_ra(inst); |
| rb = get_rb(inst); |
| |
| emulated = kvmppc_handle_store(run, vcpu, |
| vcpu->arch.gpr[rs], |
| 2, 1); |
| break; |
| |
| case 439: /* sthux */ |
| rs = get_rs(inst); |
| ra = get_ra(inst); |
| rb = get_rb(inst); |
| |
| ea = vcpu->arch.gpr[rb]; |
| if (ra) |
| ea += vcpu->arch.gpr[ra]; |
| |
| emulated = kvmppc_handle_store(run, vcpu, |
| vcpu->arch.gpr[rs], |
| 2, 1); |
| vcpu->arch.gpr[ra] = ea; |
| break; |
| |
| case 467: /* mtspr */ |
| sprn = get_sprn(inst); |
| rs = get_rs(inst); |
| switch (sprn) { |
| case SPRN_SRR0: |
| vcpu->arch.srr0 = vcpu->arch.gpr[rs]; break; |
| case SPRN_SRR1: |
| vcpu->arch.srr1 = vcpu->arch.gpr[rs]; break; |
| |
| /* XXX We need to context-switch the timebase for |
| * watchdog and FIT. */ |
| case SPRN_TBWL: break; |
| case SPRN_TBWU: break; |
| |
| case SPRN_DEC: |
| vcpu->arch.dec = vcpu->arch.gpr[rs]; |
| kvmppc_emulate_dec(vcpu); |
| break; |
| |
| case SPRN_SPRG0: |
| vcpu->arch.sprg0 = vcpu->arch.gpr[rs]; break; |
| case SPRN_SPRG1: |
| vcpu->arch.sprg1 = vcpu->arch.gpr[rs]; break; |
| case SPRN_SPRG2: |
| vcpu->arch.sprg2 = vcpu->arch.gpr[rs]; break; |
| case SPRN_SPRG3: |
| vcpu->arch.sprg3 = vcpu->arch.gpr[rs]; break; |
| |
| default: |
| emulated = kvmppc_core_emulate_mtspr(vcpu, sprn, rs); |
| if (emulated == EMULATE_FAIL) |
| printk("mtspr: unknown spr %x\n", sprn); |
| break; |
| } |
| break; |
| |
| case 470: /* dcbi */ |
| /* Do nothing. The guest is performing dcbi because |
| * hardware DMA is not snooped by the dcache, but |
| * emulated DMA either goes through the dcache as |
| * normal writes, or the host kernel has handled dcache |
| * coherence. */ |
| break; |
| |
| case 534: /* lwbrx */ |
| rt = get_rt(inst); |
| emulated = kvmppc_handle_load(run, vcpu, rt, 4, 0); |
| break; |
| |
| case 566: /* tlbsync */ |
| break; |
| |
| case 662: /* stwbrx */ |
| rs = get_rs(inst); |
| ra = get_ra(inst); |
| rb = get_rb(inst); |
| |
| emulated = kvmppc_handle_store(run, vcpu, |
| vcpu->arch.gpr[rs], |
| 4, 0); |
| break; |
| |
| case 790: /* lhbrx */ |
| rt = get_rt(inst); |
| emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0); |
| break; |
| |
| case 918: /* sthbrx */ |
| rs = get_rs(inst); |
| ra = get_ra(inst); |
| rb = get_rb(inst); |
| |
| emulated = kvmppc_handle_store(run, vcpu, |
| vcpu->arch.gpr[rs], |
| 2, 0); |
| break; |
| |
| default: |
| /* Attempt core-specific emulation below. */ |
| emulated = EMULATE_FAIL; |
| } |
| break; |
| |
| case 32: /* lwz */ |
| rt = get_rt(inst); |
| emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1); |
| break; |
| |
| case 33: /* lwzu */ |
| ra = get_ra(inst); |
| rt = get_rt(inst); |
| emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1); |
| vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed; |
| break; |
| |
| case 34: /* lbz */ |
| rt = get_rt(inst); |
| emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1); |
| break; |
| |
| case 35: /* lbzu */ |
| ra = get_ra(inst); |
| rt = get_rt(inst); |
| emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1); |
| vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed; |
| break; |
| |
| case 36: /* stw */ |
| rs = get_rs(inst); |
| emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs], |
| 4, 1); |
| break; |
| |
| case 37: /* stwu */ |
| ra = get_ra(inst); |
| rs = get_rs(inst); |
| emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs], |
| 4, 1); |
| vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed; |
| break; |
| |
| case 38: /* stb */ |
| rs = get_rs(inst); |
| emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs], |
| 1, 1); |
| break; |
| |
| case 39: /* stbu */ |
| ra = get_ra(inst); |
| rs = get_rs(inst); |
| emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs], |
| 1, 1); |
| vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed; |
| break; |
| |
| case 40: /* lhz */ |
| rt = get_rt(inst); |
| emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1); |
| break; |
| |
| case 41: /* lhzu */ |
| ra = get_ra(inst); |
| rt = get_rt(inst); |
| emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1); |
| vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed; |
| break; |
| |
| case 44: /* sth */ |
| rs = get_rs(inst); |
| emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs], |
| 2, 1); |
| break; |
| |
| case 45: /* sthu */ |
| ra = get_ra(inst); |
| rs = get_rs(inst); |
| emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs], |
| 2, 1); |
| vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed; |
| break; |
| |
| default: |
| emulated = EMULATE_FAIL; |
| } |
| |
| if (emulated == EMULATE_FAIL) { |
| emulated = kvmppc_core_emulate_op(run, vcpu, inst, &advance); |
| if (emulated == EMULATE_FAIL) { |
| advance = 0; |
| printk(KERN_ERR "Couldn't emulate instruction 0x%08x " |
| "(op %d xop %d)\n", inst, get_op(inst), get_xop(inst)); |
| } |
| } |
| |
| KVMTRACE_3D(PPC_INSTR, vcpu, inst, (int)vcpu->arch.pc, emulated, entryexit); |
| |
| if (advance) |
| vcpu->arch.pc += 4; /* Advance past emulated instruction. */ |
| |
| return emulated; |
| } |