mirror of https://gitee.com/openkylin/qemu.git
270 lines
6.7 KiB
C
270 lines
6.7 KiB
C
/*
|
|
* CRIS helper routines.
|
|
*
|
|
* Copyright (c) 2007 AXIS Communications AB
|
|
* Written by Edgar E. Iglesias.
|
|
*
|
|
* 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 <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "config.h"
|
|
#include "cpu.h"
|
|
#include "mmu.h"
|
|
#include "host-utils.h"
|
|
|
|
|
|
//#define CRIS_HELPER_DEBUG
|
|
|
|
|
|
#ifdef CRIS_HELPER_DEBUG
|
|
#define D(x) x
|
|
#define D_LOG(...) qemu_log(__VA__ARGS__)
|
|
#else
|
|
#define D(x)
|
|
#define D_LOG(...) do { } while (0)
|
|
#endif
|
|
|
|
#if defined(CONFIG_USER_ONLY)
|
|
|
|
void do_interrupt (CPUState *env)
|
|
{
|
|
env->exception_index = -1;
|
|
env->pregs[PR_ERP] = env->pc;
|
|
}
|
|
|
|
int cpu_cris_handle_mmu_fault(CPUState * env, target_ulong address, int rw,
|
|
int mmu_idx)
|
|
{
|
|
env->exception_index = 0xaa;
|
|
env->pregs[PR_EDA] = address;
|
|
cpu_dump_state(env, stderr, fprintf, 0);
|
|
return 1;
|
|
}
|
|
|
|
#else /* !CONFIG_USER_ONLY */
|
|
|
|
|
|
static void cris_shift_ccs(CPUState *env)
|
|
{
|
|
uint32_t ccs;
|
|
/* Apply the ccs shift. */
|
|
ccs = env->pregs[PR_CCS];
|
|
ccs = ((ccs & 0xc0000000) | ((ccs << 12) >> 2)) & ~0x3ff;
|
|
env->pregs[PR_CCS] = ccs;
|
|
}
|
|
|
|
int cpu_cris_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
|
|
int mmu_idx)
|
|
{
|
|
struct cris_mmu_result res;
|
|
int prot, miss;
|
|
int r = -1;
|
|
target_ulong phy;
|
|
|
|
D(printf ("%s addr=%x pc=%x rw=%x\n", __func__, address, env->pc, rw));
|
|
miss = cris_mmu_translate(&res, env, address & TARGET_PAGE_MASK,
|
|
rw, mmu_idx, 0);
|
|
if (miss)
|
|
{
|
|
if (env->exception_index == EXCP_BUSFAULT)
|
|
cpu_abort(env,
|
|
"CRIS: Illegal recursive bus fault."
|
|
"addr=%x rw=%d\n",
|
|
address, rw);
|
|
|
|
env->pregs[PR_EDA] = address;
|
|
env->exception_index = EXCP_BUSFAULT;
|
|
env->fault_vector = res.bf_vec;
|
|
r = 1;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* Mask off the cache selection bit. The ETRAX busses do not
|
|
* see the top bit.
|
|
*/
|
|
phy = res.phy & ~0x80000000;
|
|
prot = res.prot;
|
|
tlb_set_page(env, address & TARGET_PAGE_MASK, phy,
|
|
prot, mmu_idx, TARGET_PAGE_SIZE);
|
|
r = 0;
|
|
}
|
|
if (r > 0)
|
|
D_LOG("%s returns %d irqreq=%x addr=%x phy=%x vec=%x pc=%x\n",
|
|
__func__, r, env->interrupt_request, address, res.phy,
|
|
res.bf_vec, env->pc);
|
|
return r;
|
|
}
|
|
|
|
static void do_interruptv10(CPUState *env)
|
|
{
|
|
int ex_vec = -1;
|
|
|
|
D_LOG( "exception index=%d interrupt_req=%d\n",
|
|
env->exception_index,
|
|
env->interrupt_request);
|
|
|
|
assert(!(env->pregs[PR_CCS] & PFIX_FLAG));
|
|
switch (env->exception_index)
|
|
{
|
|
case EXCP_BREAK:
|
|
/* These exceptions are genereated by the core itself.
|
|
ERP should point to the insn following the brk. */
|
|
ex_vec = env->trap_vector;
|
|
env->pregs[PR_ERP] = env->pc;
|
|
break;
|
|
|
|
case EXCP_NMI:
|
|
/* NMI is hardwired to vector zero. */
|
|
ex_vec = 0;
|
|
env->pregs[PR_CCS] &= ~M_FLAG;
|
|
env->pregs[PR_NRP] = env->pc;
|
|
break;
|
|
|
|
case EXCP_BUSFAULT:
|
|
cpu_abort(env, "Unhandled busfault");
|
|
break;
|
|
|
|
default:
|
|
/* The interrupt controller gives us the vector. */
|
|
ex_vec = env->interrupt_vector;
|
|
/* Normal interrupts are taken between
|
|
TB's. env->pc is valid here. */
|
|
env->pregs[PR_ERP] = env->pc;
|
|
break;
|
|
}
|
|
|
|
if (env->pregs[PR_CCS] & U_FLAG) {
|
|
/* Swap stack pointers. */
|
|
env->pregs[PR_USP] = env->regs[R_SP];
|
|
env->regs[R_SP] = env->ksp;
|
|
}
|
|
|
|
/* Now that we are in kernel mode, load the handlers address. */
|
|
env->pc = ldl_code(env->pregs[PR_EBP] + ex_vec * 4);
|
|
env->locked_irq = 1;
|
|
|
|
qemu_log_mask(CPU_LOG_INT, "%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
|
|
__func__, env->pc, ex_vec,
|
|
env->pregs[PR_CCS],
|
|
env->pregs[PR_PID],
|
|
env->pregs[PR_ERP]);
|
|
}
|
|
|
|
void do_interrupt(CPUState *env)
|
|
{
|
|
int ex_vec = -1;
|
|
|
|
if (env->pregs[PR_VR] < 32)
|
|
return do_interruptv10(env);
|
|
|
|
D_LOG( "exception index=%d interrupt_req=%d\n",
|
|
env->exception_index,
|
|
env->interrupt_request);
|
|
|
|
switch (env->exception_index)
|
|
{
|
|
case EXCP_BREAK:
|
|
/* These exceptions are genereated by the core itself.
|
|
ERP should point to the insn following the brk. */
|
|
ex_vec = env->trap_vector;
|
|
env->pregs[PR_ERP] = env->pc;
|
|
break;
|
|
|
|
case EXCP_NMI:
|
|
/* NMI is hardwired to vector zero. */
|
|
ex_vec = 0;
|
|
env->pregs[PR_CCS] &= ~M_FLAG;
|
|
env->pregs[PR_NRP] = env->pc;
|
|
break;
|
|
|
|
case EXCP_BUSFAULT:
|
|
ex_vec = env->fault_vector;
|
|
env->pregs[PR_ERP] = env->pc;
|
|
break;
|
|
|
|
default:
|
|
/* The interrupt controller gives us the vector. */
|
|
ex_vec = env->interrupt_vector;
|
|
/* Normal interrupts are taken between
|
|
TB's. env->pc is valid here. */
|
|
env->pregs[PR_ERP] = env->pc;
|
|
break;
|
|
}
|
|
|
|
/* Fill in the IDX field. */
|
|
env->pregs[PR_EXS] = (ex_vec & 0xff) << 8;
|
|
|
|
if (env->dslot) {
|
|
D_LOG("excp isr=%x PC=%x ds=%d SP=%x"
|
|
" ERP=%x pid=%x ccs=%x cc=%d %x\n",
|
|
ex_vec, env->pc, env->dslot,
|
|
env->regs[R_SP],
|
|
env->pregs[PR_ERP], env->pregs[PR_PID],
|
|
env->pregs[PR_CCS],
|
|
env->cc_op, env->cc_mask);
|
|
/* We loose the btarget, btaken state here so rexec the
|
|
branch. */
|
|
env->pregs[PR_ERP] -= env->dslot;
|
|
/* Exception starts with dslot cleared. */
|
|
env->dslot = 0;
|
|
}
|
|
|
|
if (env->pregs[PR_CCS] & U_FLAG) {
|
|
/* Swap stack pointers. */
|
|
env->pregs[PR_USP] = env->regs[R_SP];
|
|
env->regs[R_SP] = env->ksp;
|
|
}
|
|
|
|
/* Apply the CRIS CCS shift. Clears U if set. */
|
|
cris_shift_ccs(env);
|
|
|
|
/* Now that we are in kernel mode, load the handlers address.
|
|
This load may not fault, real hw leaves that behaviour as
|
|
undefined. */
|
|
env->pc = ldl_code(env->pregs[PR_EBP] + ex_vec * 4);
|
|
|
|
/* Clear the excption_index to avoid spurios hw_aborts for recursive
|
|
bus faults. */
|
|
env->exception_index = -1;
|
|
|
|
D_LOG("%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
|
|
__func__, env->pc, ex_vec,
|
|
env->pregs[PR_CCS],
|
|
env->pregs[PR_PID],
|
|
env->pregs[PR_ERP]);
|
|
}
|
|
|
|
target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
|
|
{
|
|
uint32_t phy = addr;
|
|
struct cris_mmu_result res;
|
|
int miss;
|
|
|
|
miss = cris_mmu_translate(&res, env, addr, 0, 0, 1);
|
|
/* If D TLB misses, try I TLB. */
|
|
if (miss) {
|
|
miss = cris_mmu_translate(&res, env, addr, 2, 0, 1);
|
|
}
|
|
|
|
if (!miss)
|
|
phy = res.phy;
|
|
D(fprintf(stderr, "%s %x -> %x\n", __func__, addr, phy));
|
|
return phy;
|
|
}
|
|
#endif
|