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qemu/target/ppc/excp_helper.c
Cédric Le Goater 5ba7ba1da0 target/ppc: Add privileged message send facilities 
The Processor Control facility for POWER8 processors and later
provides a mechanism for the hypervisor to send messages to other
threads in the system (msgsnd instruction) and cause hypervisor-level
exceptions. Privileged non-hypervisor programs can also send messages
(msgsndp instruction) but are restricted to the threads of the same
subprocessor and cause privileged-level exceptions.

The Directed Privileged Doorbell Exception State (DPDES) register
reflects the state of pending privileged doorbell exceptions and can
be used to modify that state. The register can be used to read and
modify the state of privileged doorbell exceptions for all threads of
a subprocessor and thus is a shared facility for that subprocessor.
The register can be read/written by the hypervisor and read by the
supervisor if enabled in the HFSCR, otherwise a hypervisor facility
unavailable exception is generated.

The privileged message send and clear instructions (msgsndp & msgclrp)
are used to generate and clear the presence of a directed privileged
doorbell exception, respectively. The msgsndp instruction can be used
to target any thread of the current subprocessor, msgclrp acts on the
thread issuing the instruction. These instructions are privileged, but
will generate a hypervisor facility unavailable exception if not
enabled in the HFSCR and executed in privileged non-hypervisor
state. The HV facility unavailable exception will be addressed in
other patch.

Add and implement this register and instructions by reading or
modifying the pending interrupt state of the cpu.

Note that TCG only supports one thread per core and so we only need to
worry about the cpu making the access.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20200120104935.24449-2-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2020-02-02 14:07:57 +11:00

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/*
* PowerPC exception emulation helpers for QEMU.
*
* Copyright (c) 2003-2007 Jocelyn Mayer
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "cpu.h"
#include "exec/helper-proto.h"
#include "exec/exec-all.h"
#include "exec/cpu_ldst.h"
#include "internal.h"
#include "helper_regs.h"
/* #define DEBUG_OP */
/* #define DEBUG_SOFTWARE_TLB */
/* #define DEBUG_EXCEPTIONS */
#ifdef DEBUG_EXCEPTIONS
# define LOG_EXCP(...) qemu_log(__VA_ARGS__)
#else
# define LOG_EXCP(...) do { } while (0)
#endif
/*****************************************************************************/
/* Exception processing */
#if defined(CONFIG_USER_ONLY)
void ppc_cpu_do_interrupt(CPUState *cs)
{
PowerPCCPU *cpu = POWERPC_CPU(cs);
CPUPPCState *env = &cpu->env;
cs->exception_index = POWERPC_EXCP_NONE;
env->error_code = 0;
}
static void ppc_hw_interrupt(CPUPPCState *env)
{
CPUState *cs = env_cpu(env);
cs->exception_index = POWERPC_EXCP_NONE;
env->error_code = 0;
}
#else /* defined(CONFIG_USER_ONLY) */
static inline void dump_syscall(CPUPPCState *env)
{
qemu_log_mask(CPU_LOG_INT, "syscall r0=%016" PRIx64 " r3=%016" PRIx64
" r4=%016" PRIx64 " r5=%016" PRIx64 " r6=%016" PRIx64
" nip=" TARGET_FMT_lx "\n",
ppc_dump_gpr(env, 0), ppc_dump_gpr(env, 3),
ppc_dump_gpr(env, 4), ppc_dump_gpr(env, 5),
ppc_dump_gpr(env, 6), env->nip);
}
static int powerpc_reset_wakeup(CPUState *cs, CPUPPCState *env, int excp,
target_ulong *msr)
{
/* We no longer are in a PM state */
env->resume_as_sreset = false;
/* Pretend to be returning from doze always as we don't lose state */
*msr |= (0x1ull << (63 - 47));
/* Machine checks are sent normally */
if (excp == POWERPC_EXCP_MCHECK) {
return excp;
}
switch (excp) {
case POWERPC_EXCP_RESET:
*msr |= 0x4ull << (63 - 45);
break;
case POWERPC_EXCP_EXTERNAL:
*msr |= 0x8ull << (63 - 45);
break;
case POWERPC_EXCP_DECR:
*msr |= 0x6ull << (63 - 45);
break;
case POWERPC_EXCP_SDOOR:
*msr |= 0x5ull << (63 - 45);
break;
case POWERPC_EXCP_SDOOR_HV:
*msr |= 0x3ull << (63 - 45);
break;
case POWERPC_EXCP_HV_MAINT:
*msr |= 0xaull << (63 - 45);
break;
case POWERPC_EXCP_HVIRT:
*msr |= 0x9ull << (63 - 45);
break;
default:
cpu_abort(cs, "Unsupported exception %d in Power Save mode\n",
excp);
}
return POWERPC_EXCP_RESET;
}
static uint64_t ppc_excp_vector_offset(CPUState *cs, int ail)
{
uint64_t offset = 0;
switch (ail) {
case AIL_NONE:
break;
case AIL_0001_8000:
offset = 0x18000;
break;
case AIL_C000_0000_0000_4000:
offset = 0xc000000000004000ull;
break;
default:
cpu_abort(cs, "Invalid AIL combination %d\n", ail);
break;
}
return offset;
}
/*
* Note that this function should be greatly optimized when called
* with a constant excp, from ppc_hw_interrupt
*/
static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp)
{
CPUState *cs = CPU(cpu);
CPUPPCState *env = &cpu->env;
target_ulong msr, new_msr, vector;
int srr0, srr1, asrr0, asrr1, lev, ail;
bool lpes0;
qemu_log_mask(CPU_LOG_INT, "Raise exception at " TARGET_FMT_lx
" => %08x (%02x)\n", env->nip, excp, env->error_code);
/* new srr1 value excluding must-be-zero bits */
if (excp_model == POWERPC_EXCP_BOOKE) {
msr = env->msr;
} else {
msr = env->msr & ~0x783f0000ULL;
}
/*
* new interrupt handler msr preserves existing HV and ME unless
* explicitly overriden
*/
new_msr = env->msr & (((target_ulong)1 << MSR_ME) | MSR_HVB);
/* target registers */
srr0 = SPR_SRR0;
srr1 = SPR_SRR1;
asrr0 = -1;
asrr1 = -1;
/*
* check for special resume at 0x100 from doze/nap/sleep/winkle on
* P7/P8/P9
*/
if (env->resume_as_sreset) {
excp = powerpc_reset_wakeup(cs, env, excp, &msr);
}
/*
* Exception targetting modifiers
*
* LPES0 is supported on POWER7/8/9
* LPES1 is not supported (old iSeries mode)
*
* On anything else, we behave as if LPES0 is 1
* (externals don't alter MSR:HV)
*
* AIL is initialized here but can be cleared by
* selected exceptions
*/
#if defined(TARGET_PPC64)
if (excp_model == POWERPC_EXCP_POWER7 ||
excp_model == POWERPC_EXCP_POWER8 ||
excp_model == POWERPC_EXCP_POWER9) {
lpes0 = !!(env->spr[SPR_LPCR] & LPCR_LPES0);
if (excp_model != POWERPC_EXCP_POWER7) {
ail = (env->spr[SPR_LPCR] & LPCR_AIL) >> LPCR_AIL_SHIFT;
} else {
ail = 0;
}
} else
#endif /* defined(TARGET_PPC64) */
{
lpes0 = true;
ail = 0;
}
/*
* Hypervisor emulation assistance interrupt only exists on server
* arch 2.05 server or later. We also don't want to generate it if
* we don't have HVB in msr_mask (PAPR mode).
*/
if (excp == POWERPC_EXCP_HV_EMU
#if defined(TARGET_PPC64)
&& !((env->mmu_model & POWERPC_MMU_64) && (env->msr_mask & MSR_HVB))
#endif /* defined(TARGET_PPC64) */
) {
excp = POWERPC_EXCP_PROGRAM;
}
switch (excp) {
case POWERPC_EXCP_NONE:
/* Should never happen */
return;
case POWERPC_EXCP_CRITICAL: /* Critical input */
switch (excp_model) {
case POWERPC_EXCP_40x:
srr0 = SPR_40x_SRR2;
srr1 = SPR_40x_SRR3;
break;
case POWERPC_EXCP_BOOKE:
srr0 = SPR_BOOKE_CSRR0;
srr1 = SPR_BOOKE_CSRR1;
break;
case POWERPC_EXCP_G2:
break;
default:
goto excp_invalid;
}
break;
case POWERPC_EXCP_MCHECK: /* Machine check exception */
if (msr_me == 0) {
/*
* Machine check exception is not enabled. Enter
* checkstop state.
*/
fprintf(stderr, "Machine check while not allowed. "
"Entering checkstop state\n");
if (qemu_log_separate()) {
qemu_log("Machine check while not allowed. "
"Entering checkstop state\n");
}
cs->halted = 1;
cpu_interrupt_exittb(cs);
}
if (env->msr_mask & MSR_HVB) {
/*
* ISA specifies HV, but can be delivered to guest with HV
* clear (e.g., see FWNMI in PAPR).
*/
new_msr |= (target_ulong)MSR_HVB;
}
ail = 0;
/* machine check exceptions don't have ME set */
new_msr &= ~((target_ulong)1 << MSR_ME);
/* XXX: should also have something loaded in DAR / DSISR */
switch (excp_model) {
case POWERPC_EXCP_40x:
srr0 = SPR_40x_SRR2;
srr1 = SPR_40x_SRR3;
break;
case POWERPC_EXCP_BOOKE:
/* FIXME: choose one or the other based on CPU type */
srr0 = SPR_BOOKE_MCSRR0;
srr1 = SPR_BOOKE_MCSRR1;
asrr0 = SPR_BOOKE_CSRR0;
asrr1 = SPR_BOOKE_CSRR1;
break;
default:
break;
}
break;
case POWERPC_EXCP_DSI: /* Data storage exception */
LOG_EXCP("DSI exception: DSISR=" TARGET_FMT_lx" DAR=" TARGET_FMT_lx
"\n", env->spr[SPR_DSISR], env->spr[SPR_DAR]);
break;
case POWERPC_EXCP_ISI: /* Instruction storage exception */
LOG_EXCP("ISI exception: msr=" TARGET_FMT_lx ", nip=" TARGET_FMT_lx
"\n", msr, env->nip);
msr |= env->error_code;
break;
case POWERPC_EXCP_EXTERNAL: /* External input */
cs = CPU(cpu);
if (!lpes0) {
new_msr |= (target_ulong)MSR_HVB;
new_msr |= env->msr & ((target_ulong)1 << MSR_RI);
srr0 = SPR_HSRR0;
srr1 = SPR_HSRR1;
}
if (env->mpic_proxy) {
/* IACK the IRQ on delivery */
env->spr[SPR_BOOKE_EPR] = ldl_phys(cs->as, env->mpic_iack);
}
break;
case POWERPC_EXCP_ALIGN: /* Alignment exception */
/* Get rS/rD and rA from faulting opcode */
/*
* Note: the opcode fields will not be set properly for a
* direct store load/store, but nobody cares as nobody
* actually uses direct store segments.
*/
env->spr[SPR_DSISR] |= (env->error_code & 0x03FF0000) >> 16;
break;
case POWERPC_EXCP_PROGRAM: /* Program exception */
switch (env->error_code & ~0xF) {
case POWERPC_EXCP_FP:
if ((msr_fe0 == 0 && msr_fe1 == 0) || msr_fp == 0) {
LOG_EXCP("Ignore floating point exception\n");
cs->exception_index = POWERPC_EXCP_NONE;
env->error_code = 0;
return;
}
/*
* FP exceptions always have NIP pointing to the faulting
* instruction, so always use store_next and claim we are
* precise in the MSR.
*/
msr |= 0x00100000;
env->spr[SPR_BOOKE_ESR] = ESR_FP;
break;
case POWERPC_EXCP_INVAL:
LOG_EXCP("Invalid instruction at " TARGET_FMT_lx "\n", env->nip);
msr |= 0x00080000;
env->spr[SPR_BOOKE_ESR] = ESR_PIL;
break;
case POWERPC_EXCP_PRIV:
msr |= 0x00040000;
env->spr[SPR_BOOKE_ESR] = ESR_PPR;
break;
case POWERPC_EXCP_TRAP:
msr |= 0x00020000;
env->spr[SPR_BOOKE_ESR] = ESR_PTR;
break;
default:
/* Should never occur */
cpu_abort(cs, "Invalid program exception %d. Aborting\n",
env->error_code);
break;
}
break;
case POWERPC_EXCP_SYSCALL: /* System call exception */
dump_syscall(env);
lev = env->error_code;
/*
* We need to correct the NIP which in this case is supposed
* to point to the next instruction
*/
env->nip += 4;
/* "PAPR mode" built-in hypercall emulation */
if ((lev == 1) && cpu->vhyp) {
PPCVirtualHypervisorClass *vhc =
PPC_VIRTUAL_HYPERVISOR_GET_CLASS(cpu->vhyp);
vhc->hypercall(cpu->vhyp, cpu);
return;
}
if (lev == 1) {
new_msr |= (target_ulong)MSR_HVB;
}
break;
case POWERPC_EXCP_FPU: /* Floating-point unavailable exception */
case POWERPC_EXCP_APU: /* Auxiliary processor unavailable */
case POWERPC_EXCP_DECR: /* Decrementer exception */
break;
case POWERPC_EXCP_FIT: /* Fixed-interval timer interrupt */
/* FIT on 4xx */
LOG_EXCP("FIT exception\n");
break;
case POWERPC_EXCP_WDT: /* Watchdog timer interrupt */
LOG_EXCP("WDT exception\n");
switch (excp_model) {
case POWERPC_EXCP_BOOKE:
srr0 = SPR_BOOKE_CSRR0;
srr1 = SPR_BOOKE_CSRR1;
break;
default:
break;
}
break;
case POWERPC_EXCP_DTLB: /* Data TLB error */
case POWERPC_EXCP_ITLB: /* Instruction TLB error */
break;
case POWERPC_EXCP_DEBUG: /* Debug interrupt */
if (env->flags & POWERPC_FLAG_DE) {
/* FIXME: choose one or the other based on CPU type */
srr0 = SPR_BOOKE_DSRR0;
srr1 = SPR_BOOKE_DSRR1;
asrr0 = SPR_BOOKE_CSRR0;
asrr1 = SPR_BOOKE_CSRR1;
/* DBSR already modified by caller */
} else {
cpu_abort(cs, "Debug exception triggered on unsupported model\n");
}
break;
case POWERPC_EXCP_SPEU: /* SPE/embedded floating-point unavailable */
env->spr[SPR_BOOKE_ESR] = ESR_SPV;
break;
case POWERPC_EXCP_EFPDI: /* Embedded floating-point data interrupt */
/* XXX: TODO */
cpu_abort(cs, "Embedded floating point data exception "
"is not implemented yet !\n");
env->spr[SPR_BOOKE_ESR] = ESR_SPV;
break;
case POWERPC_EXCP_EFPRI: /* Embedded floating-point round interrupt */
/* XXX: TODO */
cpu_abort(cs, "Embedded floating point round exception "
"is not implemented yet !\n");
env->spr[SPR_BOOKE_ESR] = ESR_SPV;
break;
case POWERPC_EXCP_EPERFM: /* Embedded performance monitor interrupt */
/* XXX: TODO */
cpu_abort(cs,
"Performance counter exception is not implemented yet !\n");
break;
case POWERPC_EXCP_DOORI: /* Embedded doorbell interrupt */
break;
case POWERPC_EXCP_DOORCI: /* Embedded doorbell critical interrupt */
srr0 = SPR_BOOKE_CSRR0;
srr1 = SPR_BOOKE_CSRR1;
break;
case POWERPC_EXCP_RESET: /* System reset exception */
/* A power-saving exception sets ME, otherwise it is unchanged */
if (msr_pow) {
/* indicate that we resumed from power save mode */
msr |= 0x10000;
new_msr |= ((target_ulong)1 << MSR_ME);
}
if (env->msr_mask & MSR_HVB) {
/*
* ISA specifies HV, but can be delivered to guest with HV
* clear (e.g., see FWNMI in PAPR, NMI injection in QEMU).
*/
new_msr |= (target_ulong)MSR_HVB;
} else {
if (msr_pow) {
cpu_abort(cs, "Trying to deliver power-saving system reset "
"exception %d with no HV support\n", excp);
}
}
ail = 0;
break;
case POWERPC_EXCP_DSEG: /* Data segment exception */
case POWERPC_EXCP_ISEG: /* Instruction segment exception */
case POWERPC_EXCP_TRACE: /* Trace exception */
break;
case POWERPC_EXCP_HDECR: /* Hypervisor decrementer exception */
case POWERPC_EXCP_HDSI: /* Hypervisor data storage exception */
case POWERPC_EXCP_HISI: /* Hypervisor instruction storage exception */
case POWERPC_EXCP_HDSEG: /* Hypervisor data segment exception */
case POWERPC_EXCP_HISEG: /* Hypervisor instruction segment exception */
case POWERPC_EXCP_SDOOR_HV: /* Hypervisor Doorbell interrupt */
case POWERPC_EXCP_HV_EMU:
case POWERPC_EXCP_HVIRT: /* Hypervisor virtualization */
srr0 = SPR_HSRR0;
srr1 = SPR_HSRR1;
new_msr |= (target_ulong)MSR_HVB;
new_msr |= env->msr & ((target_ulong)1 << MSR_RI);
break;
case POWERPC_EXCP_VPU: /* Vector unavailable exception */
case POWERPC_EXCP_VSXU: /* VSX unavailable exception */
case POWERPC_EXCP_FU: /* Facility unavailable exception */
#ifdef TARGET_PPC64
env->spr[SPR_FSCR] |= ((target_ulong)env->error_code << 56);
#endif
break;
case POWERPC_EXCP_PIT: /* Programmable interval timer interrupt */
LOG_EXCP("PIT exception\n");
break;
case POWERPC_EXCP_IO: /* IO error exception */
/* XXX: TODO */
cpu_abort(cs, "601 IO error exception is not implemented yet !\n");
break;
case POWERPC_EXCP_RUNM: /* Run mode exception */
/* XXX: TODO */
cpu_abort(cs, "601 run mode exception is not implemented yet !\n");
break;
case POWERPC_EXCP_EMUL: /* Emulation trap exception */
/* XXX: TODO */
cpu_abort(cs, "602 emulation trap exception "
"is not implemented yet !\n");
break;
case POWERPC_EXCP_IFTLB: /* Instruction fetch TLB error */
switch (excp_model) {
case POWERPC_EXCP_602:
case POWERPC_EXCP_603:
case POWERPC_EXCP_603E:
case POWERPC_EXCP_G2:
goto tlb_miss_tgpr;
case POWERPC_EXCP_7x5:
goto tlb_miss;
case POWERPC_EXCP_74xx:
goto tlb_miss_74xx;
default:
cpu_abort(cs, "Invalid instruction TLB miss exception\n");
break;
}
break;
case POWERPC_EXCP_DLTLB: /* Data load TLB miss */
switch (excp_model) {
case POWERPC_EXCP_602:
case POWERPC_EXCP_603:
case POWERPC_EXCP_603E:
case POWERPC_EXCP_G2:
goto tlb_miss_tgpr;
case POWERPC_EXCP_7x5:
goto tlb_miss;
case POWERPC_EXCP_74xx:
goto tlb_miss_74xx;
default:
cpu_abort(cs, "Invalid data load TLB miss exception\n");
break;
}
break;
case POWERPC_EXCP_DSTLB: /* Data store TLB miss */
switch (excp_model) {
case POWERPC_EXCP_602:
case POWERPC_EXCP_603:
case POWERPC_EXCP_603E:
case POWERPC_EXCP_G2:
tlb_miss_tgpr:
/* Swap temporary saved registers with GPRs */
if (!(new_msr & ((target_ulong)1 << MSR_TGPR))) {
new_msr |= (target_ulong)1 << MSR_TGPR;
hreg_swap_gpr_tgpr(env);
}
goto tlb_miss;
case POWERPC_EXCP_7x5:
tlb_miss:
#if defined(DEBUG_SOFTWARE_TLB)
if (qemu_log_enabled()) {
const char *es;
target_ulong *miss, *cmp;
int en;
if (excp == POWERPC_EXCP_IFTLB) {
es = "I";
en = 'I';
miss = &env->spr[SPR_IMISS];
cmp = &env->spr[SPR_ICMP];
} else {
if (excp == POWERPC_EXCP_DLTLB) {
es = "DL";
} else {
es = "DS";
}
en = 'D';
miss = &env->spr[SPR_DMISS];
cmp = &env->spr[SPR_DCMP];
}
qemu_log("6xx %sTLB miss: %cM " TARGET_FMT_lx " %cC "
TARGET_FMT_lx " H1 " TARGET_FMT_lx " H2 "
TARGET_FMT_lx " %08x\n", es, en, *miss, en, *cmp,
env->spr[SPR_HASH1], env->spr[SPR_HASH2],
env->error_code);
}
#endif
msr |= env->crf[0] << 28;
msr |= env->error_code; /* key, D/I, S/L bits */
/* Set way using a LRU mechanism */
msr |= ((env->last_way + 1) & (env->nb_ways - 1)) << 17;
break;
case POWERPC_EXCP_74xx:
tlb_miss_74xx:
#if defined(DEBUG_SOFTWARE_TLB)
if (qemu_log_enabled()) {
const char *es;
target_ulong *miss, *cmp;
int en;
if (excp == POWERPC_EXCP_IFTLB) {
es = "I";
en = 'I';
miss = &env->spr[SPR_TLBMISS];
cmp = &env->spr[SPR_PTEHI];
} else {
if (excp == POWERPC_EXCP_DLTLB) {
es = "DL";
} else {
es = "DS";
}
en = 'D';
miss = &env->spr[SPR_TLBMISS];
cmp = &env->spr[SPR_PTEHI];
}
qemu_log("74xx %sTLB miss: %cM " TARGET_FMT_lx " %cC "
TARGET_FMT_lx " %08x\n", es, en, *miss, en, *cmp,
env->error_code);
}
#endif
msr |= env->error_code; /* key bit */
break;
default:
cpu_abort(cs, "Invalid data store TLB miss exception\n");
break;
}
break;
case POWERPC_EXCP_FPA: /* Floating-point assist exception */
/* XXX: TODO */
cpu_abort(cs, "Floating point assist exception "
"is not implemented yet !\n");
break;
case POWERPC_EXCP_DABR: /* Data address breakpoint */
/* XXX: TODO */
cpu_abort(cs, "DABR exception is not implemented yet !\n");
break;
case POWERPC_EXCP_IABR: /* Instruction address breakpoint */
/* XXX: TODO */
cpu_abort(cs, "IABR exception is not implemented yet !\n");
break;
case POWERPC_EXCP_SMI: /* System management interrupt */
/* XXX: TODO */
cpu_abort(cs, "SMI exception is not implemented yet !\n");
break;
case POWERPC_EXCP_THERM: /* Thermal interrupt */
/* XXX: TODO */
cpu_abort(cs, "Thermal management exception "
"is not implemented yet !\n");
break;
case POWERPC_EXCP_PERFM: /* Embedded performance monitor interrupt */
/* XXX: TODO */
cpu_abort(cs,
"Performance counter exception is not implemented yet !\n");
break;
case POWERPC_EXCP_VPUA: /* Vector assist exception */
/* XXX: TODO */
cpu_abort(cs, "VPU assist exception is not implemented yet !\n");
break;
case POWERPC_EXCP_SOFTP: /* Soft patch exception */
/* XXX: TODO */
cpu_abort(cs,
"970 soft-patch exception is not implemented yet !\n");
break;
case POWERPC_EXCP_MAINT: /* Maintenance exception */
/* XXX: TODO */
cpu_abort(cs,
"970 maintenance exception is not implemented yet !\n");
break;
case POWERPC_EXCP_MEXTBR: /* Maskable external breakpoint */
/* XXX: TODO */
cpu_abort(cs, "Maskable external exception "
"is not implemented yet !\n");
break;
case POWERPC_EXCP_NMEXTBR: /* Non maskable external breakpoint */
/* XXX: TODO */
cpu_abort(cs, "Non maskable external exception "
"is not implemented yet !\n");
break;
default:
excp_invalid:
cpu_abort(cs, "Invalid PowerPC exception %d. Aborting\n", excp);
break;
}
/* Save PC */
env->spr[srr0] = env->nip;
/* Save MSR */
env->spr[srr1] = msr;
/* Sanity check */
if (!(env->msr_mask & MSR_HVB)) {
if (new_msr & MSR_HVB) {
cpu_abort(cs, "Trying to deliver HV exception (MSR) %d with "
"no HV support\n", excp);
}
if (srr0 == SPR_HSRR0) {
cpu_abort(cs, "Trying to deliver HV exception (HSRR) %d with "
"no HV support\n", excp);
}
}
/* If any alternate SRR register are defined, duplicate saved values */
if (asrr0 != -1) {
env->spr[asrr0] = env->spr[srr0];
}
if (asrr1 != -1) {
env->spr[asrr1] = env->spr[srr1];
}
/*
* Sort out endianness of interrupt, this differs depending on the
* CPU, the HV mode, etc...
*/
#ifdef TARGET_PPC64
if (excp_model == POWERPC_EXCP_POWER7) {
if (!(new_msr & MSR_HVB) && (env->spr[SPR_LPCR] & LPCR_ILE)) {
new_msr |= (target_ulong)1 << MSR_LE;
}
} else if (excp_model == POWERPC_EXCP_POWER8) {
if (new_msr & MSR_HVB) {
if (env->spr[SPR_HID0] & HID0_HILE) {
new_msr |= (target_ulong)1 << MSR_LE;
}
} else if (env->spr[SPR_LPCR] & LPCR_ILE) {
new_msr |= (target_ulong)1 << MSR_LE;
}
} else if (excp_model == POWERPC_EXCP_POWER9) {
if (new_msr & MSR_HVB) {
if (env->spr[SPR_HID0] & HID0_POWER9_HILE) {
new_msr |= (target_ulong)1 << MSR_LE;
}
} else if (env->spr[SPR_LPCR] & LPCR_ILE) {
new_msr |= (target_ulong)1 << MSR_LE;
}
} else if (msr_ile) {
new_msr |= (target_ulong)1 << MSR_LE;
}
#else
if (msr_ile) {
new_msr |= (target_ulong)1 << MSR_LE;
}
#endif
/* Jump to handler */
vector = env->excp_vectors[excp];
if (vector == (target_ulong)-1ULL) {
cpu_abort(cs, "Raised an exception without defined vector %d\n",
excp);
}
vector |= env->excp_prefix;
/*
* AIL only works if there is no HV transition and we are running
* with translations enabled
*/
if (!((msr >> MSR_IR) & 1) || !((msr >> MSR_DR) & 1) ||
((new_msr & MSR_HVB) && !(msr & MSR_HVB))) {
ail = 0;
}
/* Handle AIL */
if (ail) {
new_msr |= (1 << MSR_IR) | (1 << MSR_DR);
vector |= ppc_excp_vector_offset(cs, ail);
}
#if defined(TARGET_PPC64)
if (excp_model == POWERPC_EXCP_BOOKE) {
if (env->spr[SPR_BOOKE_EPCR] & EPCR_ICM) {
/* Cat.64-bit: EPCR.ICM is copied to MSR.CM */
new_msr |= (target_ulong)1 << MSR_CM;
} else {
vector = (uint32_t)vector;
}
} else {
if (!msr_isf && !(env->mmu_model & POWERPC_MMU_64)) {
vector = (uint32_t)vector;
} else {
new_msr |= (target_ulong)1 << MSR_SF;
}
}
#endif
/*
* We don't use hreg_store_msr here as already have treated any
* special case that could occur. Just store MSR and update hflags
*
* Note: We *MUST* not use hreg_store_msr() as-is anyway because it
* will prevent setting of the HV bit which some exceptions might need
* to do.
*/
env->msr = new_msr & env->msr_mask;
hreg_compute_hflags(env);
env->nip = vector;
/* Reset exception state */
cs->exception_index = POWERPC_EXCP_NONE;
env->error_code = 0;
/* Reset the reservation */
env->reserve_addr = -1;
/*
* Any interrupt is context synchronizing, check if TCG TLB needs
* a delayed flush on ppc64
*/
check_tlb_flush(env, false);
}
void ppc_cpu_do_interrupt(CPUState *cs)
{
PowerPCCPU *cpu = POWERPC_CPU(cs);
CPUPPCState *env = &cpu->env;
powerpc_excp(cpu, env->excp_model, cs->exception_index);
}
static void ppc_hw_interrupt(CPUPPCState *env)
{
PowerPCCPU *cpu = env_archcpu(env);
bool async_deliver;
/* External reset */
if (env->pending_interrupts & (1 << PPC_INTERRUPT_RESET)) {
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_RESET);
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_RESET);
return;
}
/* Machine check exception */
if (env->pending_interrupts & (1 << PPC_INTERRUPT_MCK)) {
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_MCK);
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_MCHECK);
return;
}
#if 0 /* TODO */
/* External debug exception */
if (env->pending_interrupts & (1 << PPC_INTERRUPT_DEBUG)) {
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_DEBUG);
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_DEBUG);
return;
}
#endif
/*
* For interrupts that gate on MSR:EE, we need to do something a
* bit more subtle, as we need to let them through even when EE is
* clear when coming out of some power management states (in order
* for them to become a 0x100).
*/
async_deliver = (msr_ee != 0) || env->resume_as_sreset;
/* Hypervisor decrementer exception */
if (env->pending_interrupts & (1 << PPC_INTERRUPT_HDECR)) {
/* LPCR will be clear when not supported so this will work */
bool hdice = !!(env->spr[SPR_LPCR] & LPCR_HDICE);
if ((async_deliver || msr_hv == 0) && hdice) {
/* HDEC clears on delivery */
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_HDECR);
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_HDECR);
return;
}
}
/* Hypervisor virtualization interrupt */
if (env->pending_interrupts & (1 << PPC_INTERRUPT_HVIRT)) {
/* LPCR will be clear when not supported so this will work */
bool hvice = !!(env->spr[SPR_LPCR] & LPCR_HVICE);
if ((async_deliver || msr_hv == 0) && hvice) {
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_HVIRT);
return;
}
}
/* External interrupt can ignore MSR:EE under some circumstances */
if (env->pending_interrupts & (1 << PPC_INTERRUPT_EXT)) {
bool lpes0 = !!(env->spr[SPR_LPCR] & LPCR_LPES0);
bool heic = !!(env->spr[SPR_LPCR] & LPCR_HEIC);
/* HEIC blocks delivery to the hypervisor */
if ((async_deliver && !(heic && msr_hv && !msr_pr)) ||
(env->has_hv_mode && msr_hv == 0 && !lpes0)) {
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_EXTERNAL);
return;
}
}
if (msr_ce != 0) {
/* External critical interrupt */
if (env->pending_interrupts & (1 << PPC_INTERRUPT_CEXT)) {
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_CRITICAL);
return;
}
}
if (async_deliver != 0) {
/* Watchdog timer on embedded PowerPC */
if (env->pending_interrupts & (1 << PPC_INTERRUPT_WDT)) {
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_WDT);
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_WDT);
return;
}
if (env->pending_interrupts & (1 << PPC_INTERRUPT_CDOORBELL)) {
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_CDOORBELL);
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_DOORCI);
return;
}
/* Fixed interval timer on embedded PowerPC */
if (env->pending_interrupts & (1 << PPC_INTERRUPT_FIT)) {
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_FIT);
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_FIT);
return;
}
/* Programmable interval timer on embedded PowerPC */
if (env->pending_interrupts & (1 << PPC_INTERRUPT_PIT)) {
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_PIT);
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_PIT);
return;
}
/* Decrementer exception */
if (env->pending_interrupts & (1 << PPC_INTERRUPT_DECR)) {
if (ppc_decr_clear_on_delivery(env)) {
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_DECR);
}
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_DECR);
return;
}
if (env->pending_interrupts & (1 << PPC_INTERRUPT_DOORBELL)) {
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_DOORBELL);
if (is_book3s_arch2x(env)) {
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_SDOOR);
} else {
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_DOORI);
}
return;
}
if (env->pending_interrupts & (1 << PPC_INTERRUPT_HDOORBELL)) {
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_HDOORBELL);
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_SDOOR_HV);
return;
}
if (env->pending_interrupts & (1 << PPC_INTERRUPT_PERFM)) {
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_PERFM);
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_PERFM);
return;
}
/* Thermal interrupt */
if (env->pending_interrupts & (1 << PPC_INTERRUPT_THERM)) {
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_THERM);
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_THERM);
return;
}
}
if (env->resume_as_sreset) {
/*
* This is a bug ! It means that has_work took us out of halt without
* anything to deliver while in a PM state that requires getting
* out via a 0x100
*
* This means we will incorrectly execute past the power management
* instruction instead of triggering a reset.
*
* It generally means a discrepancy between the wakup conditions in the
* processor has_work implementation and the logic in this function.
*/
cpu_abort(env_cpu(env),
"Wakeup from PM state but interrupt Undelivered");
}
}
void ppc_cpu_do_system_reset(CPUState *cs)
{
PowerPCCPU *cpu = POWERPC_CPU(cs);
CPUPPCState *env = &cpu->env;
powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_RESET);
}
#endif /* !CONFIG_USER_ONLY */
bool ppc_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
{
PowerPCCPU *cpu = POWERPC_CPU(cs);
CPUPPCState *env = &cpu->env;
if (interrupt_request & CPU_INTERRUPT_HARD) {
ppc_hw_interrupt(env);
if (env->pending_interrupts == 0) {
cs->interrupt_request &= ~CPU_INTERRUPT_HARD;
}
return true;
}
return false;
}
#if defined(DEBUG_OP)
static void cpu_dump_rfi(target_ulong RA, target_ulong msr)
{
qemu_log("Return from exception at " TARGET_FMT_lx " with flags "
TARGET_FMT_lx "\n", RA, msr);
}
#endif
/*****************************************************************************/
/* Exceptions processing helpers */
void raise_exception_err_ra(CPUPPCState *env, uint32_t exception,
uint32_t error_code, uintptr_t raddr)
{
CPUState *cs = env_cpu(env);
cs->exception_index = exception;
env->error_code = error_code;
cpu_loop_exit_restore(cs, raddr);
}
void raise_exception_err(CPUPPCState *env, uint32_t exception,
uint32_t error_code)
{
raise_exception_err_ra(env, exception, error_code, 0);
}
void raise_exception(CPUPPCState *env, uint32_t exception)
{
raise_exception_err_ra(env, exception, 0, 0);
}
void raise_exception_ra(CPUPPCState *env, uint32_t exception,
uintptr_t raddr)
{
raise_exception_err_ra(env, exception, 0, raddr);
}
void helper_raise_exception_err(CPUPPCState *env, uint32_t exception,
uint32_t error_code)
{
raise_exception_err_ra(env, exception, error_code, 0);
}
void helper_raise_exception(CPUPPCState *env, uint32_t exception)
{
raise_exception_err_ra(env, exception, 0, 0);
}
#if !defined(CONFIG_USER_ONLY)
void helper_store_msr(CPUPPCState *env, target_ulong val)
{
uint32_t excp = hreg_store_msr(env, val, 0);
if (excp != 0) {
CPUState *cs = env_cpu(env);
cpu_interrupt_exittb(cs);
raise_exception(env, excp);
}
}
#if defined(TARGET_PPC64)
void helper_pminsn(CPUPPCState *env, powerpc_pm_insn_t insn)
{
CPUState *cs;
cs = env_cpu(env);
cs->halted = 1;
/*
* The architecture specifies that HDEC interrupts are discarded
* in PM states
*/
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_HDECR);
/* Condition for waking up at 0x100 */
env->resume_as_sreset = (insn != PPC_PM_STOP) ||
(env->spr[SPR_PSSCR] & PSSCR_EC);
}
#endif /* defined(TARGET_PPC64) */
static inline void do_rfi(CPUPPCState *env, target_ulong nip, target_ulong msr)
{
CPUState *cs = env_cpu(env);
/* MSR:POW cannot be set by any form of rfi */
msr &= ~(1ULL << MSR_POW);
#if defined(TARGET_PPC64)
/* Switching to 32-bit ? Crop the nip */
if (!msr_is_64bit(env, msr)) {
nip = (uint32_t)nip;
}
#else
nip = (uint32_t)nip;
#endif
/* XXX: beware: this is false if VLE is supported */
env->nip = nip & ~((target_ulong)0x00000003);
hreg_store_msr(env, msr, 1);
#if defined(DEBUG_OP)
cpu_dump_rfi(env->nip, env->msr);
#endif
/*
* No need to raise an exception here, as rfi is always the last
* insn of a TB
*/
cpu_interrupt_exittb(cs);
/* Reset the reservation */
env->reserve_addr = -1;
/* Context synchronizing: check if TCG TLB needs flush */
check_tlb_flush(env, false);
}
void helper_rfi(CPUPPCState *env)
{
do_rfi(env, env->spr[SPR_SRR0], env->spr[SPR_SRR1] & 0xfffffffful);
}
#define MSR_BOOK3S_MASK
#if defined(TARGET_PPC64)
void helper_rfid(CPUPPCState *env)
{
/*
* The architeture defines a number of rules for which bits can
* change but in practice, we handle this in hreg_store_msr()
* which will be called by do_rfi(), so there is no need to filter
* here
*/
do_rfi(env, env->spr[SPR_SRR0], env->spr[SPR_SRR1]);
}
void helper_hrfid(CPUPPCState *env)
{
do_rfi(env, env->spr[SPR_HSRR0], env->spr[SPR_HSRR1]);
}
#endif
/*****************************************************************************/
/* Embedded PowerPC specific helpers */
void helper_40x_rfci(CPUPPCState *env)
{
do_rfi(env, env->spr[SPR_40x_SRR2], env->spr[SPR_40x_SRR3]);
}
void helper_rfci(CPUPPCState *env)
{
do_rfi(env, env->spr[SPR_BOOKE_CSRR0], env->spr[SPR_BOOKE_CSRR1]);
}
void helper_rfdi(CPUPPCState *env)
{
/* FIXME: choose CSRR1 or DSRR1 based on cpu type */
do_rfi(env, env->spr[SPR_BOOKE_DSRR0], env->spr[SPR_BOOKE_DSRR1]);
}
void helper_rfmci(CPUPPCState *env)
{
/* FIXME: choose CSRR1 or MCSRR1 based on cpu type */
do_rfi(env, env->spr[SPR_BOOKE_MCSRR0], env->spr[SPR_BOOKE_MCSRR1]);
}
#endif
void helper_tw(CPUPPCState *env, target_ulong arg1, target_ulong arg2,
uint32_t flags)
{
if (!likely(!(((int32_t)arg1 < (int32_t)arg2 && (flags & 0x10)) ||
((int32_t)arg1 > (int32_t)arg2 && (flags & 0x08)) ||
((int32_t)arg1 == (int32_t)arg2 && (flags & 0x04)) ||
((uint32_t)arg1 < (uint32_t)arg2 && (flags & 0x02)) ||
((uint32_t)arg1 > (uint32_t)arg2 && (flags & 0x01))))) {
raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
POWERPC_EXCP_TRAP, GETPC());
}
}
#if defined(TARGET_PPC64)
void helper_td(CPUPPCState *env, target_ulong arg1, target_ulong arg2,
uint32_t flags)
{
if (!likely(!(((int64_t)arg1 < (int64_t)arg2 && (flags & 0x10)) ||
((int64_t)arg1 > (int64_t)arg2 && (flags & 0x08)) ||
((int64_t)arg1 == (int64_t)arg2 && (flags & 0x04)) ||
((uint64_t)arg1 < (uint64_t)arg2 && (flags & 0x02)) ||
((uint64_t)arg1 > (uint64_t)arg2 && (flags & 0x01))))) {
raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
POWERPC_EXCP_TRAP, GETPC());
}
}
#endif
#if !defined(CONFIG_USER_ONLY)
/*****************************************************************************/
/* PowerPC 601 specific instructions (POWER bridge) */
void helper_rfsvc(CPUPPCState *env)
{
do_rfi(env, env->lr, env->ctr & 0x0000FFFF);
}
/* Embedded.Processor Control */
static int dbell2irq(target_ulong rb)
{
int msg = rb & DBELL_TYPE_MASK;
int irq = -1;
switch (msg) {
case DBELL_TYPE_DBELL:
irq = PPC_INTERRUPT_DOORBELL;
break;
case DBELL_TYPE_DBELL_CRIT:
irq = PPC_INTERRUPT_CDOORBELL;
break;
case DBELL_TYPE_G_DBELL:
case DBELL_TYPE_G_DBELL_CRIT:
case DBELL_TYPE_G_DBELL_MC:
/* XXX implement */
default:
break;
}
return irq;
}
void helper_msgclr(CPUPPCState *env, target_ulong rb)
{
int irq = dbell2irq(rb);
if (irq < 0) {
return;
}
env->pending_interrupts &= ~(1 << irq);
}
void helper_msgsnd(target_ulong rb)
{
int irq = dbell2irq(rb);
int pir = rb & DBELL_PIRTAG_MASK;
CPUState *cs;
if (irq < 0) {
return;
}
qemu_mutex_lock_iothread();
CPU_FOREACH(cs) {
PowerPCCPU *cpu = POWERPC_CPU(cs);
CPUPPCState *cenv = &cpu->env;
if ((rb & DBELL_BRDCAST) || (cenv->spr[SPR_BOOKE_PIR] == pir)) {
cenv->pending_interrupts |= 1 << irq;
cpu_interrupt(cs, CPU_INTERRUPT_HARD);
}
}
qemu_mutex_unlock_iothread();
}
/* Server Processor Control */
static bool dbell_type_server(target_ulong rb)
{
/*
* A Directed Hypervisor Doorbell message is sent only if the
* message type is 5. All other types are reserved and the
* instruction is a no-op
*/
return (rb & DBELL_TYPE_MASK) == DBELL_TYPE_DBELL_SERVER;
}
void helper_book3s_msgclr(CPUPPCState *env, target_ulong rb)
{
if (!dbell_type_server(rb)) {
return;
}
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_HDOORBELL);
}
static void book3s_msgsnd_common(int pir, int irq)
{
CPUState *cs;
qemu_mutex_lock_iothread();
CPU_FOREACH(cs) {
PowerPCCPU *cpu = POWERPC_CPU(cs);
CPUPPCState *cenv = &cpu->env;
/* TODO: broadcast message to all threads of the same processor */
if (cenv->spr_cb[SPR_PIR].default_value == pir) {
cenv->pending_interrupts |= 1 << irq;
cpu_interrupt(cs, CPU_INTERRUPT_HARD);
}
}
qemu_mutex_unlock_iothread();
}
void helper_book3s_msgsnd(target_ulong rb)
{
int pir = rb & DBELL_PROCIDTAG_MASK;
if (!dbell_type_server(rb)) {
return;
}
book3s_msgsnd_common(pir, PPC_INTERRUPT_HDOORBELL);
}
#if defined(TARGET_PPC64)
void helper_book3s_msgclrp(CPUPPCState *env, target_ulong rb)
{
if (!dbell_type_server(rb)) {
return;
}
env->pending_interrupts &= ~(1 << PPC_INTERRUPT_DOORBELL);
}
/*
* sends a message to other threads that are on the same
* multi-threaded processor
*/
void helper_book3s_msgsndp(CPUPPCState *env, target_ulong rb)
{
int pir = env->spr_cb[SPR_PIR].default_value;
if (!dbell_type_server(rb)) {
return;
}
/* TODO: TCG supports only one thread */
book3s_msgsnd_common(pir, PPC_INTERRUPT_DOORBELL);
}
#endif
#endif
void ppc_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr,
MMUAccessType access_type,
int mmu_idx, uintptr_t retaddr)
{
CPUPPCState *env = cs->env_ptr;
uint32_t insn;
/* Restore state and reload the insn we executed, for filling in DSISR. */
cpu_restore_state(cs, retaddr, true);
insn = cpu_ldl_code(env, env->nip);
cs->exception_index = POWERPC_EXCP_ALIGN;
env->error_code = insn & 0x03FF0000;
cpu_loop_exit(cs);
}
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