e5e84d22a3
This brings the m68k target in line with all other targets. Reviewed-by: Stefan Weil <sw@weilnetz.de> Signed-off-by: Richard Henderson <rth@twiddle.net>
234 lines
5.4 KiB
C
234 lines
5.4 KiB
C
/*
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* M68K helper routines
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*
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* Copyright (c) 2007 CodeSourcery
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "cpu.h"
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#include "helper.h"
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#if defined(CONFIG_USER_ONLY)
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void m68k_cpu_do_interrupt(CPUState *cs)
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{
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M68kCPU *cpu = M68K_CPU(cs);
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CPUM68KState *env = &cpu->env;
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env->exception_index = -1;
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}
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void do_interrupt_m68k_hardirq(CPUM68KState *env)
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{
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}
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#else
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extern int semihosting_enabled;
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#include "exec/softmmu_exec.h"
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#define MMUSUFFIX _mmu
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#define SHIFT 0
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#include "exec/softmmu_template.h"
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#define SHIFT 1
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#include "exec/softmmu_template.h"
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#define SHIFT 2
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#include "exec/softmmu_template.h"
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#define SHIFT 3
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#include "exec/softmmu_template.h"
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/* Try to fill the TLB and return an exception if error. If retaddr is
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NULL, it means that the function was called in C code (i.e. not
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from generated code or from helper.c) */
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void tlb_fill(CPUM68KState *env, target_ulong addr, int is_write, int mmu_idx,
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uintptr_t retaddr)
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{
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int ret;
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ret = cpu_m68k_handle_mmu_fault(env, addr, is_write, mmu_idx);
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if (unlikely(ret)) {
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if (retaddr) {
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/* now we have a real cpu fault */
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cpu_restore_state(env, retaddr);
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}
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cpu_loop_exit(env);
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}
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}
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static void do_rte(CPUM68KState *env)
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{
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uint32_t sp;
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uint32_t fmt;
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sp = env->aregs[7];
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fmt = cpu_ldl_kernel(env, sp);
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env->pc = cpu_ldl_kernel(env, sp + 4);
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sp |= (fmt >> 28) & 3;
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env->sr = fmt & 0xffff;
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m68k_switch_sp(env);
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env->aregs[7] = sp + 8;
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}
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static void do_interrupt_all(CPUM68KState *env, int is_hw)
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{
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CPUState *cs;
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uint32_t sp;
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uint32_t fmt;
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uint32_t retaddr;
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uint32_t vector;
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fmt = 0;
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retaddr = env->pc;
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if (!is_hw) {
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switch (env->exception_index) {
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case EXCP_RTE:
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/* Return from an exception. */
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do_rte(env);
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return;
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case EXCP_HALT_INSN:
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if (semihosting_enabled
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&& (env->sr & SR_S) != 0
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&& (env->pc & 3) == 0
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&& cpu_lduw_code(env, env->pc - 4) == 0x4e71
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&& cpu_ldl_code(env, env->pc) == 0x4e7bf000) {
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env->pc += 4;
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do_m68k_semihosting(env, env->dregs[0]);
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return;
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}
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cs = CPU(m68k_env_get_cpu(env));
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cs->halted = 1;
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env->exception_index = EXCP_HLT;
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cpu_loop_exit(env);
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return;
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}
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if (env->exception_index >= EXCP_TRAP0
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&& env->exception_index <= EXCP_TRAP15) {
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/* Move the PC after the trap instruction. */
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retaddr += 2;
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}
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}
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vector = env->exception_index << 2;
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sp = env->aregs[7];
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fmt |= 0x40000000;
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fmt |= (sp & 3) << 28;
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fmt |= vector << 16;
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fmt |= env->sr;
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env->sr |= SR_S;
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if (is_hw) {
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env->sr = (env->sr & ~SR_I) | (env->pending_level << SR_I_SHIFT);
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env->sr &= ~SR_M;
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}
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m68k_switch_sp(env);
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/* ??? This could cause MMU faults. */
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sp &= ~3;
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sp -= 4;
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cpu_stl_kernel(env, sp, retaddr);
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sp -= 4;
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cpu_stl_kernel(env, sp, fmt);
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env->aregs[7] = sp;
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/* Jump to vector. */
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env->pc = cpu_ldl_kernel(env, env->vbr + vector);
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}
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void m68k_cpu_do_interrupt(CPUState *cs)
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{
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M68kCPU *cpu = M68K_CPU(cs);
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CPUM68KState *env = &cpu->env;
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do_interrupt_all(env, 0);
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}
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void do_interrupt_m68k_hardirq(CPUM68KState *env)
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{
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do_interrupt_all(env, 1);
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}
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#endif
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static void raise_exception(CPUM68KState *env, int tt)
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{
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env->exception_index = tt;
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cpu_loop_exit(env);
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}
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void HELPER(raise_exception)(CPUM68KState *env, uint32_t tt)
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{
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raise_exception(env, tt);
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}
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void HELPER(divu)(CPUM68KState *env, uint32_t word)
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{
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uint32_t num;
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uint32_t den;
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uint32_t quot;
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uint32_t rem;
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uint32_t flags;
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num = env->div1;
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den = env->div2;
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/* ??? This needs to make sure the throwing location is accurate. */
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if (den == 0) {
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raise_exception(env, EXCP_DIV0);
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}
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quot = num / den;
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rem = num % den;
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flags = 0;
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if (word && quot > 0xffff)
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flags |= CCF_V;
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if (quot == 0)
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flags |= CCF_Z;
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else if ((int32_t)quot < 0)
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flags |= CCF_N;
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env->div1 = quot;
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env->div2 = rem;
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env->cc_dest = flags;
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}
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void HELPER(divs)(CPUM68KState *env, uint32_t word)
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{
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int32_t num;
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int32_t den;
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int32_t quot;
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int32_t rem;
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int32_t flags;
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num = env->div1;
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den = env->div2;
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if (den == 0) {
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raise_exception(env, EXCP_DIV0);
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}
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quot = num / den;
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rem = num % den;
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flags = 0;
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if (word && quot != (int16_t)quot)
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flags |= CCF_V;
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if (quot == 0)
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flags |= CCF_Z;
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else if (quot < 0)
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flags |= CCF_N;
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env->div1 = quot;
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env->div2 = rem;
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env->cc_dest = flags;
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}
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