0cf5c6771b
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2967 c046a42c-6fe2-441c-8c8c-71466251a162
160 lines
4.1 KiB
C
160 lines
4.1 KiB
C
/*
|
|
* M68K helper routines
|
|
*
|
|
* Copyright (c) 2007 CodeSourcery
|
|
*
|
|
* 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, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include "exec.h"
|
|
|
|
#if defined(CONFIG_USER_ONLY)
|
|
|
|
void do_interrupt(int is_hw)
|
|
{
|
|
env->exception_index = -1;
|
|
}
|
|
|
|
#else
|
|
|
|
extern int semihosting_enabled;
|
|
|
|
#define MMUSUFFIX _mmu
|
|
#define GETPC() (__builtin_return_address(0))
|
|
|
|
#define SHIFT 0
|
|
#include "softmmu_template.h"
|
|
|
|
#define SHIFT 1
|
|
#include "softmmu_template.h"
|
|
|
|
#define SHIFT 2
|
|
#include "softmmu_template.h"
|
|
|
|
#define SHIFT 3
|
|
#include "softmmu_template.h"
|
|
|
|
/* Try to fill the TLB and return an exception if error. If retaddr is
|
|
NULL, it means that the function was called in C code (i.e. not
|
|
from generated code or from helper.c) */
|
|
/* XXX: fix it to restore all registers */
|
|
void tlb_fill (target_ulong addr, int is_write, int is_user, void *retaddr)
|
|
{
|
|
TranslationBlock *tb;
|
|
CPUState *saved_env;
|
|
target_phys_addr_t pc;
|
|
int ret;
|
|
|
|
/* XXX: hack to restore env in all cases, even if not called from
|
|
generated code */
|
|
saved_env = env;
|
|
env = cpu_single_env;
|
|
ret = cpu_m68k_handle_mmu_fault(env, addr, is_write, is_user, 1);
|
|
if (__builtin_expect(ret, 0)) {
|
|
if (retaddr) {
|
|
/* now we have a real cpu fault */
|
|
pc = (target_phys_addr_t)retaddr;
|
|
tb = tb_find_pc(pc);
|
|
if (tb) {
|
|
/* the PC is inside the translated code. It means that we have
|
|
a virtual CPU fault */
|
|
cpu_restore_state(tb, env, pc, NULL);
|
|
}
|
|
}
|
|
cpu_loop_exit();
|
|
}
|
|
env = saved_env;
|
|
}
|
|
|
|
static void do_rte(void)
|
|
{
|
|
uint32_t sp;
|
|
uint32_t fmt;
|
|
|
|
sp = env->aregs[7];
|
|
fmt = ldl_kernel(sp);
|
|
env->pc = ldl_kernel(sp + 4);
|
|
sp |= (fmt >> 28) & 3;
|
|
env->sr = fmt & 0xffff;
|
|
m68k_switch_sp(env);
|
|
env->aregs[7] = sp + 8;
|
|
}
|
|
|
|
void do_interrupt(int is_hw)
|
|
{
|
|
uint32_t sp;
|
|
uint32_t fmt;
|
|
uint32_t retaddr;
|
|
uint32_t vector;
|
|
|
|
fmt = 0;
|
|
retaddr = env->pc;
|
|
|
|
if (!is_hw) {
|
|
switch (env->exception_index) {
|
|
case EXCP_RTE:
|
|
/* Return from an exception. */
|
|
do_rte();
|
|
return;
|
|
case EXCP_HALT_INSN:
|
|
if (semihosting_enabled
|
|
&& (env->sr & SR_S) != 0
|
|
&& (env->pc & 3) == 0
|
|
&& lduw_code(env->pc - 4) == 0x4e71
|
|
&& ldl_code(env->pc) == 0x4e7bf000) {
|
|
env->pc += 4;
|
|
do_m68k_semihosting(env, env->dregs[0]);
|
|
return;
|
|
}
|
|
env->halted = 1;
|
|
env->exception_index = EXCP_HLT;
|
|
cpu_loop_exit();
|
|
return;
|
|
}
|
|
if (env->exception_index >= EXCP_TRAP0
|
|
&& env->exception_index <= EXCP_TRAP15) {
|
|
/* Move the PC after the trap instruction. */
|
|
retaddr += 2;
|
|
}
|
|
}
|
|
|
|
vector = env->exception_index << 2;
|
|
|
|
sp = env->aregs[7];
|
|
|
|
fmt |= 0x40000000;
|
|
fmt |= (sp & 3) << 28;
|
|
fmt |= vector << 16;
|
|
fmt |= env->sr;
|
|
|
|
env->sr |= SR_S;
|
|
if (is_hw) {
|
|
env->sr = (env->sr & ~SR_I) | (env->pending_level << SR_I_SHIFT);
|
|
env->sr &= ~SR_M;
|
|
}
|
|
m68k_switch_sp(env);
|
|
|
|
/* ??? This could cause MMU faults. */
|
|
sp &= ~3;
|
|
sp -= 4;
|
|
stl_kernel(sp, retaddr);
|
|
sp -= 4;
|
|
stl_kernel(sp, fmt);
|
|
env->aregs[7] = sp;
|
|
/* Jump to vector. */
|
|
env->pc = ldl_kernel(env->vbr + vector);
|
|
}
|
|
|
|
#endif
|