mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-23 03:29:43 +00:00
3d419a4dd2
The value passed is always true, and if the target's synchronize_from_tb hook is non-trivial, not exiting may be erroneous. Reviewed-by: Claudio Fontana <cfontana@suse.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
121 lines
3.5 KiB
C
121 lines
3.5 KiB
C
/*
|
|
* Altera Nios II helper routines.
|
|
*
|
|
* Copyright (C) 2012 Chris Wulff <crwulff@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 2.1 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/lgpl-2.1.html>
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "cpu.h"
|
|
#include "exec/helper-proto.h"
|
|
#include "exec/exec-all.h"
|
|
#include "qemu/main-loop.h"
|
|
|
|
void helper_raise_exception(CPUNios2State *env, uint32_t index)
|
|
{
|
|
CPUState *cs = env_cpu(env);
|
|
cs->exception_index = index;
|
|
cpu_loop_exit(cs);
|
|
}
|
|
|
|
void nios2_cpu_loop_exit_advance(CPUNios2State *env, uintptr_t retaddr)
|
|
{
|
|
CPUState *cs = env_cpu(env);
|
|
|
|
/*
|
|
* Note that PC is advanced for all hardware exceptions.
|
|
* Do this here, rather than in restore_state_to_opc(),
|
|
* lest we affect QEMU internal exceptions, like EXCP_DEBUG.
|
|
*/
|
|
cpu_restore_state(cs, retaddr);
|
|
env->pc += 4;
|
|
cpu_loop_exit(cs);
|
|
}
|
|
|
|
static void maybe_raise_div(CPUNios2State *env, uintptr_t ra)
|
|
{
|
|
Nios2CPU *cpu = env_archcpu(env);
|
|
CPUState *cs = env_cpu(env);
|
|
|
|
if (cpu->diverr_present) {
|
|
cs->exception_index = EXCP_DIV;
|
|
nios2_cpu_loop_exit_advance(env, ra);
|
|
}
|
|
}
|
|
|
|
int32_t helper_divs(CPUNios2State *env, int32_t num, int32_t den)
|
|
{
|
|
if (unlikely(den == 0) || unlikely(den == -1 && num == INT32_MIN)) {
|
|
maybe_raise_div(env, GETPC());
|
|
return num; /* undefined */
|
|
}
|
|
return num / den;
|
|
}
|
|
|
|
uint32_t helper_divu(CPUNios2State *env, uint32_t num, uint32_t den)
|
|
{
|
|
if (unlikely(den == 0)) {
|
|
maybe_raise_div(env, GETPC());
|
|
return num; /* undefined */
|
|
}
|
|
return num / den;
|
|
}
|
|
|
|
#ifndef CONFIG_USER_ONLY
|
|
void helper_eret(CPUNios2State *env, uint32_t new_status, uint32_t new_pc)
|
|
{
|
|
Nios2CPU *cpu = env_archcpu(env);
|
|
CPUState *cs = env_cpu(env);
|
|
|
|
if (unlikely(new_pc & 3)) {
|
|
env->ctrl[CR_BADADDR] = new_pc;
|
|
cs->exception_index = EXCP_UNALIGND;
|
|
nios2_cpu_loop_exit_advance(env, GETPC());
|
|
}
|
|
|
|
/*
|
|
* None of estatus, bstatus, or sstatus have constraints on write;
|
|
* do not allow reserved fields in status to be set.
|
|
* When shadow registers are enabled, eret *does* restore CRS.
|
|
* Rather than testing eic_present to decide, mask CRS out of
|
|
* the set of readonly fields.
|
|
*/
|
|
new_status &= cpu->cr_state[CR_STATUS].writable |
|
|
(cpu->cr_state[CR_STATUS].readonly & R_CR_STATUS_CRS_MASK);
|
|
|
|
env->ctrl[CR_STATUS] = new_status;
|
|
env->pc = new_pc;
|
|
nios2_update_crs(env);
|
|
cpu_loop_exit(cs);
|
|
}
|
|
|
|
/*
|
|
* RDPRS and WRPRS are implemented out of line so that if PRS == CRS,
|
|
* all of the tcg global temporaries are synced back to ENV.
|
|
*/
|
|
uint32_t helper_rdprs(CPUNios2State *env, uint32_t regno)
|
|
{
|
|
unsigned prs = FIELD_EX32(env->ctrl[CR_STATUS], CR_STATUS, PRS);
|
|
return env->shadow_regs[prs][regno];
|
|
}
|
|
|
|
void helper_wrprs(CPUNios2State *env, uint32_t regno, uint32_t val)
|
|
{
|
|
unsigned prs = FIELD_EX32(env->ctrl[CR_STATUS], CR_STATUS, PRS);
|
|
env->shadow_regs[prs][regno] = val;
|
|
}
|
|
#endif /* !CONFIG_USER_ONLY */
|