Improve readability by shortening some long comments, removing
comments that state the obvious and dropping some empty lines so they
don't distract when reading the code.
Signed-off-by: BALATON Zoltan <bala...@eik.bme.hu>
Acked-by: Nicholas Piggin <npig...@gmail.com>
---
target/ppc/cpu.h | 1 +
target/ppc/excp_helper.c | 180 +++++++--------------------------------
2 files changed, 33 insertions(+), 148 deletions(-)
diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index 0ee2adc105..d7acd65176 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -2739,6 +2739,7 @@ static inline bool ppc_has_spr(PowerPCCPU *cpu, int spr)
}
#if !defined(CONFIG_USER_ONLY)
+/* Sort out endianness of interrupt. Depends on the CPU, HV mode, etc. */
static inline bool ppc_interrupts_little_endian(PowerPCCPU *cpu, bool hv)
{
PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index 49ed3e1825..74113958b5 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -382,9 +382,8 @@ static void powerpc_set_excp_state(PowerPCCPU *cpu,
target_ulong vector,
* 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.
+ * 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->nip = vector;
env->msr = msr;
@@ -426,25 +425,15 @@ static void powerpc_excp_40x(PowerPCCPU *cpu, int excp)
{
CPUPPCState *env = &cpu->env;
target_ulong msr, new_msr, vector;
- int srr0, srr1;
+ int srr0 = SPR_SRR0, srr1 = SPR_SRR1;
/* new srr1 value excluding must-be-zero bits */
msr = env->msr & ~0x783f0000ULL;
- /*
- * new interrupt handler msr preserves existing ME unless
- * explicitly overriden.
- */
+ /* new interrupt handler msr preserves ME unless explicitly overriden */
new_msr = env->msr & (((target_ulong)1 << MSR_ME));
- /* target registers */
- srr0 = SPR_SRR0;
- srr1 = SPR_SRR1;
-
- /*
- * Hypervisor emulation assistance interrupt only exists on server
- * arch 2.05 server or later.
- */
+ /* HV emu assistance interrupt only exists on server arch 2.05 or later */
if (excp == POWERPC_EXCP_HV_EMU) {
excp = POWERPC_EXCP_PROGRAM;
}
@@ -454,7 +443,6 @@ static void powerpc_excp_40x(PowerPCCPU *cpu, int excp)
cpu_abort(env_cpu(env),
"Raised an exception without defined vector %d\n", excp);
}
-
vector |= env->excp_prefix;
switch (excp) {
@@ -466,7 +454,6 @@ static void powerpc_excp_40x(PowerPCCPU *cpu, int excp)
powerpc_mcheck_checkstop(env);
/* machine check exceptions don't have ME set */
new_msr &= ~((target_ulong)1 << MSR_ME);
-
srr0 = SPR_40x_SRR2;
srr1 = SPR_40x_SRR3;
break;
@@ -537,12 +524,8 @@ static void powerpc_excp_40x(PowerPCCPU *cpu, int excp)
break;
}
- /* Save PC */
env->spr[srr0] = env->nip;
-
- /* Save MSR */
env->spr[srr1] = msr;
-
powerpc_set_excp_state(cpu, vector, new_msr);
}
@@ -554,16 +537,10 @@ static void powerpc_excp_6xx(PowerPCCPU *cpu, int excp)
/* new srr1 value excluding must-be-zero bits */
msr = env->msr & ~0x783f0000ULL;
- /*
- * new interrupt handler msr preserves existing ME unless
- * explicitly overriden
- */
+ /* new interrupt handler msr preserves ME unless explicitly overriden */
new_msr = env->msr & ((target_ulong)1 << MSR_ME);
- /*
- * Hypervisor emulation assistance interrupt only exists on server
- * arch 2.05 server or later.
- */
+ /* HV emu assistance interrupt only exists on server arch 2.05 or later */
if (excp == POWERPC_EXCP_HV_EMU) {
excp = POWERPC_EXCP_PROGRAM;
}
@@ -573,7 +550,6 @@ static void powerpc_excp_6xx(PowerPCCPU *cpu, int excp)
cpu_abort(env_cpu(env),
"Raised an exception without defined vector %d\n", excp);
}
-
vector |= env->excp_prefix;
switch (excp) {
@@ -583,7 +559,6 @@ static void powerpc_excp_6xx(PowerPCCPU *cpu, int excp)
powerpc_mcheck_checkstop(env);
/* machine check exceptions don't have ME set */
new_msr &= ~((target_ulong)1 << MSR_ME);
-
break;
case POWERPC_EXCP_DSI: /* Data storage exception */
trace_ppc_excp_dsi(env->spr[SPR_DSISR], env->spr[SPR_DAR]);
@@ -611,11 +586,9 @@ static void powerpc_excp_6xx(PowerPCCPU *cpu, int excp)
powerpc_reset_excp_state(cpu);
return;
}
-
/*
- * FP exceptions always have NIP pointing to the faulting
- * instruction, so always use store_next and claim we are
- * precise in the MSR.
+ * NIP always points to the faulting instruction for FP exceptions,
+ * so always use store_next and claim we are precise in the MSR.
*/
msr |= 0x00100000;
break;
@@ -691,20 +664,11 @@ static void powerpc_excp_6xx(PowerPCCPU *cpu, int excp)
break;
}
- /*
- * Sort out endianness of interrupt, this differs depending on the
- * CPU, the HV mode, etc...
- */
if (ppc_interrupts_little_endian(cpu, !!(new_msr & MSR_HVB))) {
new_msr |= (target_ulong)1 << MSR_LE;
}
-
- /* Save PC */
env->spr[SPR_SRR0] = env->nip;
-
- /* Save MSR */
env->spr[SPR_SRR1] = msr;
-
powerpc_set_excp_state(cpu, vector, new_msr);
}
@@ -716,16 +680,10 @@ static void powerpc_excp_7xx(PowerPCCPU *cpu, int excp)
/* new srr1 value excluding must-be-zero bits */
msr = env->msr & ~0x783f0000ULL;
- /*
- * new interrupt handler msr preserves existing ME unless
- * explicitly overriden
- */
+ /* new interrupt handler msr preserves ME unless explicitly overriden */
new_msr = env->msr & ((target_ulong)1 << MSR_ME);
- /*
- * Hypervisor emulation assistance interrupt only exists on server
- * arch 2.05 server or later.
- */
+ /* HV emu assistance interrupt only exists on server arch 2.05 or later */
if (excp == POWERPC_EXCP_HV_EMU) {
excp = POWERPC_EXCP_PROGRAM;
}
@@ -735,7 +693,6 @@ static void powerpc_excp_7xx(PowerPCCPU *cpu, int excp)
cpu_abort(env_cpu(env),
"Raised an exception without defined vector %d\n", excp);
}
-
vector |= env->excp_prefix;
switch (excp) {
@@ -743,7 +700,6 @@ static void powerpc_excp_7xx(PowerPCCPU *cpu, int excp)
powerpc_mcheck_checkstop(env);
/* machine check exceptions don't have ME set */
new_msr &= ~((target_ulong)1 << MSR_ME);
-
break;
case POWERPC_EXCP_DSI: /* Data storage exception */
trace_ppc_excp_dsi(env->spr[SPR_DSISR], env->spr[SPR_DAR]);
@@ -771,11 +727,9 @@ static void powerpc_excp_7xx(PowerPCCPU *cpu, int excp)
powerpc_reset_excp_state(cpu);
return;
}
-
/*
- * FP exceptions always have NIP pointing to the faulting
- * instruction, so always use store_next and claim we are
- * precise in the MSR.
+ * NIP always points to the faulting instruction for FP exceptions,
+ * so always use store_next and claim we are precise in the MSR.
*/
msr |= 0x00100000;
break;
@@ -843,12 +797,10 @@ static void powerpc_excp_7xx(PowerPCCPU *cpu, int excp)
case POWERPC_EXCP_DLTLB: /* Data load TLB miss */
case POWERPC_EXCP_DSTLB: /* Data store TLB miss */
ppc_excp_debug_sw_tlb(env, excp);
-
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_IABR: /* Instruction address breakpoint */
case POWERPC_EXCP_SMI: /* System management interrupt */
@@ -863,20 +815,11 @@ static void powerpc_excp_7xx(PowerPCCPU *cpu, int excp)
break;
}
- /*
- * Sort out endianness of interrupt, this differs depending on the
- * CPU, the HV mode, etc...
- */
if (ppc_interrupts_little_endian(cpu, !!(new_msr & MSR_HVB))) {
new_msr |= (target_ulong)1 << MSR_LE;
}
-
- /* Save PC */
env->spr[SPR_SRR0] = env->nip;
-
- /* Save MSR */
env->spr[SPR_SRR1] = msr;
-
powerpc_set_excp_state(cpu, vector, new_msr);
}
@@ -888,16 +831,10 @@ static void powerpc_excp_74xx(PowerPCCPU *cpu, int excp)
/* new srr1 value excluding must-be-zero bits */
msr = env->msr & ~0x783f0000ULL;
- /*
- * new interrupt handler msr preserves existing ME unless
- * explicitly overriden
- */
+ /* new interrupt handler msr preserves ME unless explicitly overriden */
new_msr = env->msr & ((target_ulong)1 << MSR_ME);
- /*
- * Hypervisor emulation assistance interrupt only exists on server
- * arch 2.05 server or later.
- */
+ /* HV emu assistance interrupt only exists on server arch 2.05 or later */
if (excp == POWERPC_EXCP_HV_EMU) {
excp = POWERPC_EXCP_PROGRAM;
}
@@ -907,7 +844,6 @@ static void powerpc_excp_74xx(PowerPCCPU *cpu, int excp)
cpu_abort(env_cpu(env),
"Raised an exception without defined vector %d\n", excp);
}
-
vector |= env->excp_prefix;
switch (excp) {
@@ -915,7 +851,6 @@ static void powerpc_excp_74xx(PowerPCCPU *cpu, int excp)
powerpc_mcheck_checkstop(env);
/* machine check exceptions don't have ME set */
new_msr &= ~((target_ulong)1 << MSR_ME);
-
break;
case POWERPC_EXCP_DSI: /* Data storage exception */
trace_ppc_excp_dsi(env->spr[SPR_DSISR], env->spr[SPR_DAR]);
@@ -943,11 +878,9 @@ static void powerpc_excp_74xx(PowerPCCPU *cpu, int excp)
powerpc_reset_excp_state(cpu);
return;
}
-
/*
- * FP exceptions always have NIP pointing to the faulting
- * instruction, so always use store_next and claim we are
- * precise in the MSR.
+ * NIP always points to the faulting instruction for FP exceptions,
+ * so always use store_next and claim we are precise in the MSR.
*/
msr |= 0x00100000;
break;
@@ -1027,20 +960,11 @@ static void powerpc_excp_74xx(PowerPCCPU *cpu, int excp)
break;
}
- /*
- * Sort out endianness of interrupt, this differs depending on the
- * CPU, the HV mode, etc...
- */
if (ppc_interrupts_little_endian(cpu, !!(new_msr & MSR_HVB))) {
new_msr |= (target_ulong)1 << MSR_LE;
}
-
- /* Save PC */
env->spr[SPR_SRR0] = env->nip;
-
- /* Save MSR */
env->spr[SPR_SRR1] = msr;
-
powerpc_set_excp_state(cpu, vector, new_msr);
}
@@ -1048,24 +972,18 @@ static void powerpc_excp_booke(PowerPCCPU *cpu, int excp)
{
CPUPPCState *env = &cpu->env;
target_ulong msr, new_msr, vector;
- int srr0, srr1;
-
- msr = env->msr;
+ int srr0 = SPR_SRR0, srr1 = SPR_SRR1;
/*
- * new interrupt handler msr preserves existing ME unless
- * explicitly overriden
+ * Book E does not play games with certain bits of xSRR1 being MSR save
+ * bits and others being error status. xSRR1 is the old MSR, period.
*/
- new_msr = env->msr & ((target_ulong)1 << MSR_ME);
+ msr = env->msr;
- /* target registers */
- srr0 = SPR_SRR0;
- srr1 = SPR_SRR1;
+ /* new interrupt handler msr preserves ME unless explicitly overriden */
+ new_msr = env->msr & ((target_ulong)1 << MSR_ME);
- /*
- * Hypervisor emulation assistance interrupt only exists on server
- * arch 2.05 server or later.
- */
+ /* HV emu assistance interrupt only exists on server arch 2.05 or later */
if (excp == POWERPC_EXCP_HV_EMU) {
excp = POWERPC_EXCP_PROGRAM;
}
@@ -1085,7 +1003,6 @@ static void powerpc_excp_booke(PowerPCCPU *cpu, int excp)
cpu_abort(env_cpu(env),
"Raised an exception without defined vector %d\n", excp);
}
-
vector |= env->excp_prefix;
switch (excp) {
@@ -1129,11 +1046,9 @@ static void powerpc_excp_booke(PowerPCCPU *cpu, int excp)
powerpc_reset_excp_state(cpu);
return;
}
-
/*
- * FP exceptions always have NIP pointing to the faulting
- * instruction, so always use store_next and claim we are
- * precise in the MSR.
+ * NIP always points to the faulting instruction for FP exceptions,
+ * so always use store_next and claim we are precise in the MSR.
*/
msr |= 0x00100000;
env->spr[SPR_BOOKE_ESR] = ESR_FP;
@@ -1234,12 +1149,8 @@ static void powerpc_excp_booke(PowerPCCPU *cpu, int excp)
}
#endif
- /* Save PC */
env->spr[srr0] = env->nip;
-
- /* Save MSR */
env->spr[srr1] = msr;
-
powerpc_set_excp_state(cpu, vector, new_msr);
}
@@ -1286,21 +1197,17 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int
excp)
{
CPUPPCState *env = &cpu->env;
target_ulong msr, new_msr, vector;
- int srr0, srr1, lev = -1;
+ int srr0 = SPR_SRR0, srr1 = SPR_SRR1, lev = -1;
/* new srr1 value excluding must-be-zero bits */
msr = env->msr & ~0x783f0000ULL;
/*
- * new interrupt handler msr preserves existing HV and ME unless
- * explicitly overriden
+ * new interrupt handler msr preserves 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;
-
/*
* check for special resume at 0x100 from doze/nap/sleep/winkle on
* P7/P8/P9
@@ -1325,7 +1232,6 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int excp)
cpu_abort(env_cpu(env),
"Raised an exception without defined vector %d\n", excp);
}
-
vector |= env->excp_prefix;
switch (excp) {
@@ -1338,10 +1244,8 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int excp)
*/
new_msr |= (target_ulong)MSR_HVB;
}
-
/* machine check exceptions don't have ME set */
new_msr &= ~((target_ulong)1 << MSR_ME);
-
break;
case POWERPC_EXCP_DSI: /* Data storage exception */
trace_ppc_excp_dsi(env->spr[SPR_DSISR], env->spr[SPR_DAR]);
@@ -1354,23 +1258,17 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int
excp)
{
bool lpes0;
- /*
- * LPES0 is only taken into consideration if we support HV
- * mode for this CPU.
- */
+ /* LPES0 is only taken into consideration if we support HV mode */
if (!env->has_hv_mode) {
break;
}
-
lpes0 = !!(env->spr[SPR_LPCR] & LPCR_LPES0);
-
if (!lpes0) {
new_msr |= (target_ulong)MSR_HVB;
new_msr |= env->msr & ((target_ulong)1 << MSR_RI);
srr0 = SPR_HSRR0;
srr1 = SPR_HSRR1;
}
-
break;
}
case POWERPC_EXCP_ALIGN: /* Alignment exception */
@@ -1393,11 +1291,9 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int excp)
powerpc_reset_excp_state(cpu);
return;
}
-
/*
- * FP exceptions always have NIP pointing to the faulting
- * instruction, so always use store_next and claim we are
- * precise in the MSR.
+ * NIP always points to the faulting instruction for FP exceptions,
+ * so always use store_next and claim we are precise in the MSR.
*/
msr |= 0x00100000;
break;
@@ -1539,21 +1435,13 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int
excp)
break;
}
- /*
- * Sort out endianness of interrupt, this differs depending on the
- * CPU, the HV mode, etc...
- */
if (ppc_interrupts_little_endian(cpu, !!(new_msr & MSR_HVB))) {
new_msr |= (target_ulong)1 << MSR_LE;
}
-
new_msr |= (target_ulong)1 << MSR_SF;
if (excp != POWERPC_EXCP_SYSCALL_VECTORED) {
- /* Save PC */
env->spr[srr0] = env->nip;
-
- /* Save MSR */
env->spr[srr1] = msr;
}
@@ -1562,19 +1450,15 @@ static void powerpc_excp_books(PowerPCCPU *cpu, int
excp)
PPC_VIRTUAL_HYPERVISOR_GET_CLASS(cpu->vhyp);
/* Deliver interrupt to L1 by returning from the H_ENTER_NESTED call */
vhc->deliver_hv_excp(cpu, excp);
-
powerpc_reset_excp_state(cpu);
-
} else {
/* Sanity check */
if (!(env->msr_mask & MSR_HVB) && srr0 == SPR_HSRR0) {
cpu_abort(env_cpu(env), "Trying to deliver HV exception (HSRR) %d "
"with no HV support\n", excp);
}
-
/* This can update new_msr and vector if AIL applies */
ppc_excp_apply_ail(cpu, excp, msr, &new_msr, &vector);
-
powerpc_set_excp_state(cpu, vector, new_msr);
}
}
--
2.30.9
