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/*
* MicroBlaze helper routines.
*
* Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>
*
* 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 "cpu.h"
#include "host-utils.h"
#define D(x)
#define DMMU(x)
#if defined(CONFIG_USER_ONLY)
void do_interrupt (CPUState *env)
{
env->exception_index = -1;
env->regs[14] = env->sregs[SR_PC];
}
int cpu_mb_handle_mmu_fault(CPUState * env, target_ulong address, int rw,
int mmu_idx)
{
env->exception_index = 0xaa;
cpu_dump_state(env, stderr, fprintf, 0);
return 1;
}
#else /* !CONFIG_USER_ONLY */
int cpu_mb_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
int mmu_idx)
{
unsigned int hit;
unsigned int mmu_available;
int r = 1;
int prot;
mmu_available = 0;
if (env->pvr.regs[0] & PVR0_USE_MMU) {
mmu_available = 1;
if ((env->pvr.regs[0] & PVR0_PVR_FULL_MASK)
&& (env->pvr.regs[11] & PVR11_USE_MMU) != PVR11_USE_MMU) {
mmu_available = 0;
}
}
/* Translate if the MMU is available and enabled. */
if (mmu_available && (env->sregs[SR_MSR] & MSR_VM)) {
target_ulong vaddr, paddr;
struct microblaze_mmu_lookup lu;
hit = mmu_translate(&env->mmu, &lu, address, rw, mmu_idx);
if (hit) {
vaddr = address & TARGET_PAGE_MASK;
paddr = lu.paddr + vaddr - lu.vaddr;
DMMU(qemu_log("MMU map mmu=%d v=%x p=%x prot=%x\n",
mmu_idx, vaddr, paddr, lu.prot));
tlb_set_page(env, vaddr, paddr, lu.prot, mmu_idx, TARGET_PAGE_SIZE);
r = 0;
} else {
env->sregs[SR_EAR] = address;
DMMU(qemu_log("mmu=%d miss v=%x\n", mmu_idx, address));
switch (lu.err) {
case ERR_PROT:
env->sregs[SR_ESR] = rw == 2 ? 17 : 16;
env->sregs[SR_ESR] |= (rw == 1) << 10;
break;
case ERR_MISS:
env->sregs[SR_ESR] = rw == 2 ? 19 : 18;
env->sregs[SR_ESR] |= (rw == 1) << 10;
break;
default:
abort();
break;
}
if (env->exception_index == EXCP_MMU) {
cpu_abort(env, "recursive faults\n");
}
/* TLB miss. */
env->exception_index = EXCP_MMU;
}
} else {
/* MMU disabled or not available. */
address &= TARGET_PAGE_MASK;
prot = PAGE_BITS;
tlb_set_page(env, address, address, prot, mmu_idx, TARGET_PAGE_SIZE);
r = 0;
}
return r;
}
void do_interrupt(CPUState *env)
{
uint32_t t;
/* IMM flag cannot propagate across a branch and into the dslot. */
assert(!((env->iflags & D_FLAG) && (env->iflags & IMM_FLAG)));
assert(!(env->iflags & (DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)));
/* assert(env->sregs[SR_MSR] & (MSR_EE)); Only for HW exceptions. */
switch (env->exception_index) {
case EXCP_HW_EXCP:
if (!(env->pvr.regs[0] & PVR0_USE_EXC_MASK)) {
qemu_log("Exception raised on system without exceptions!\n");
return;
}
env->regs[17] = env->sregs[SR_PC] + 4;
env->sregs[SR_ESR] &= ~(1 << 12);
/* Exception breaks branch + dslot sequence? */
if (env->iflags & D_FLAG) {
env->sregs[SR_ESR] |= 1 << 12 ;
env->sregs[SR_BTR] = env->btarget;
}
/* Disable the MMU. */
t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
env->sregs[SR_MSR] |= t;
/* Exception in progress. */
env->sregs[SR_MSR] |= MSR_EIP;
qemu_log_mask(CPU_LOG_INT,
"hw exception at pc=%x ear=%x esr=%x iflags=%x\n",
env->sregs[SR_PC], env->sregs[SR_EAR],
env->sregs[SR_ESR], env->iflags);
log_cpu_state_mask(CPU_LOG_INT, env, 0);
env->iflags &= ~(IMM_FLAG | D_FLAG);
env->sregs[SR_PC] = 0x20;
break;
case EXCP_MMU:
env->regs[17] = env->sregs[SR_PC];
env->sregs[SR_ESR] &= ~(1 << 12);
/* Exception breaks branch + dslot sequence? */
if (env->iflags & D_FLAG) {
D(qemu_log("D_FLAG set at exception bimm=%d\n", env->bimm));
env->sregs[SR_ESR] |= 1 << 12 ;
env->sregs[SR_BTR] = env->btarget;
/* Reexecute the branch. */
env->regs[17] -= 4;
/* was the branch immprefixed?. */
if (env->bimm) {
qemu_log_mask(CPU_LOG_INT,
"bimm exception at pc=%x iflags=%x\n",
env->sregs[SR_PC], env->iflags);
env->regs[17] -= 4;
log_cpu_state_mask(CPU_LOG_INT, env, 0);
}
} else if (env->iflags & IMM_FLAG) {
D(qemu_log("IMM_FLAG set at exception\n"));
env->regs[17] -= 4;
}
/* Disable the MMU. */
t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
env->sregs[SR_MSR] |= t;
/* Exception in progress. */
env->sregs[SR_MSR] |= MSR_EIP;
qemu_log_mask(CPU_LOG_INT,
"exception at pc=%x ear=%x iflags=%x\n",
env->sregs[SR_PC], env->sregs[SR_EAR], env->iflags);
log_cpu_state_mask(CPU_LOG_INT, env, 0);
env->iflags &= ~(IMM_FLAG | D_FLAG);
env->sregs[SR_PC] = 0x20;
break;
case EXCP_IRQ:
assert(!(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP)));
assert(env->sregs[SR_MSR] & MSR_IE);
assert(!(env->iflags & D_FLAG));
t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
#if 0
#include "disas.h"
/* Useful instrumentation when debugging interrupt issues in either
the models or in sw. */
{
const char *sym;
sym = lookup_symbol(env->sregs[SR_PC]);
if (sym
&& (!strcmp("netif_rx", sym)
|| !strcmp("process_backlog", sym))) {
qemu_log(
"interrupt at pc=%x msr=%x %x iflags=%x sym=%s\n",
env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags,
sym);
log_cpu_state(env, 0);
}
}
#endif
qemu_log_mask(CPU_LOG_INT,
"interrupt at pc=%x msr=%x %x iflags=%x\n",
env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags);
env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM \
| MSR_UM | MSR_IE);
env->sregs[SR_MSR] |= t;
env->regs[14] = env->sregs[SR_PC];
env->sregs[SR_PC] = 0x10;
//log_cpu_state_mask(CPU_LOG_INT, env, 0);
break;
case EXCP_BREAK:
case EXCP_HW_BREAK:
assert(!(env->iflags & IMM_FLAG));
assert(!(env->iflags & D_FLAG));
t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
qemu_log_mask(CPU_LOG_INT,
"break at pc=%x msr=%x %x iflags=%x\n",
env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags);
log_cpu_state_mask(CPU_LOG_INT, env, 0);
env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
env->sregs[SR_MSR] |= t;
env->sregs[SR_MSR] |= MSR_BIP;
if (env->exception_index == EXCP_HW_BREAK) {
env->regs[16] = env->sregs[SR_PC];
env->sregs[SR_MSR] |= MSR_BIP;
env->sregs[SR_PC] = 0x18;
} else
env->sregs[SR_PC] = env->btarget;
break;
default:
cpu_abort(env, "unhandled exception type=%d\n",
env->exception_index);
break;
}
}
target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
{
target_ulong vaddr, paddr = 0;
struct microblaze_mmu_lookup lu;
unsigned int hit;
if (env->sregs[SR_MSR] & MSR_VM) {
hit = mmu_translate(&env->mmu, &lu, addr, 0, 0);
if (hit) {
vaddr = addr & TARGET_PAGE_MASK;
paddr = lu.paddr + vaddr - lu.vaddr;
} else
paddr = 0; /* ???. */
} else
paddr = addr & TARGET_PAGE_MASK;
return paddr;
}
#endif
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