295 lines
8.7 KiB
C
295 lines
8.7 KiB
C
/*
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* Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the Open Source and Linux Lab nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "cpu.h"
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#include "dyngen-exec.h"
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#include "helpers.h"
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#include "host-utils.h"
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#define MMUSUFFIX _mmu
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#define SHIFT 0
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#include "softmmu_template.h"
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#define SHIFT 1
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#include "softmmu_template.h"
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#define SHIFT 2
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#include "softmmu_template.h"
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#define SHIFT 3
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#include "softmmu_template.h"
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void tlb_fill(target_ulong addr, int is_write, int mmu_idx, void *retaddr)
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{
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tlb_set_page(cpu_single_env,
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addr & ~(TARGET_PAGE_SIZE - 1),
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addr & ~(TARGET_PAGE_SIZE - 1),
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PAGE_READ | PAGE_WRITE | PAGE_EXEC,
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mmu_idx, TARGET_PAGE_SIZE);
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}
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void HELPER(exception)(uint32_t excp)
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{
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env->exception_index = excp;
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cpu_loop_exit(env);
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}
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void HELPER(exception_cause)(uint32_t pc, uint32_t cause)
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{
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uint32_t vector;
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env->pc = pc;
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if (env->sregs[PS] & PS_EXCM) {
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if (env->config->ndepc) {
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env->sregs[DEPC] = pc;
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} else {
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env->sregs[EPC1] = pc;
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}
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vector = EXC_DOUBLE;
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} else {
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env->sregs[EPC1] = pc;
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vector = (env->sregs[PS] & PS_UM) ? EXC_USER : EXC_KERNEL;
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}
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env->sregs[EXCCAUSE] = cause;
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env->sregs[PS] |= PS_EXCM;
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HELPER(exception)(vector);
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}
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void HELPER(exception_cause_vaddr)(uint32_t pc, uint32_t cause, uint32_t vaddr)
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{
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env->sregs[EXCVADDR] = vaddr;
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HELPER(exception_cause)(pc, cause);
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}
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uint32_t HELPER(nsa)(uint32_t v)
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{
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if (v & 0x80000000) {
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v = ~v;
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}
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return v ? clz32(v) - 1 : 31;
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}
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uint32_t HELPER(nsau)(uint32_t v)
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{
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return v ? clz32(v) : 32;
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}
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static void copy_window_from_phys(CPUState *env,
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uint32_t window, uint32_t phys, uint32_t n)
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{
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assert(phys < env->config->nareg);
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if (phys + n <= env->config->nareg) {
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memcpy(env->regs + window, env->phys_regs + phys,
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n * sizeof(uint32_t));
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} else {
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uint32_t n1 = env->config->nareg - phys;
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memcpy(env->regs + window, env->phys_regs + phys,
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n1 * sizeof(uint32_t));
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memcpy(env->regs + window + n1, env->phys_regs,
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(n - n1) * sizeof(uint32_t));
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}
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}
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static void copy_phys_from_window(CPUState *env,
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uint32_t phys, uint32_t window, uint32_t n)
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{
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assert(phys < env->config->nareg);
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if (phys + n <= env->config->nareg) {
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memcpy(env->phys_regs + phys, env->regs + window,
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n * sizeof(uint32_t));
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} else {
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uint32_t n1 = env->config->nareg - phys;
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memcpy(env->phys_regs + phys, env->regs + window,
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n1 * sizeof(uint32_t));
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memcpy(env->phys_regs, env->regs + window + n1,
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(n - n1) * sizeof(uint32_t));
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}
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}
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static inline unsigned windowbase_bound(unsigned a, const CPUState *env)
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{
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return a & (env->config->nareg / 4 - 1);
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}
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static inline unsigned windowstart_bit(unsigned a, const CPUState *env)
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{
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return 1 << windowbase_bound(a, env);
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}
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void xtensa_sync_window_from_phys(CPUState *env)
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{
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copy_window_from_phys(env, 0, env->sregs[WINDOW_BASE] * 4, 16);
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}
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void xtensa_sync_phys_from_window(CPUState *env)
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{
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copy_phys_from_window(env, env->sregs[WINDOW_BASE] * 4, 0, 16);
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}
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static void rotate_window_abs(uint32_t position)
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{
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xtensa_sync_phys_from_window(env);
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env->sregs[WINDOW_BASE] = windowbase_bound(position, env);
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xtensa_sync_window_from_phys(env);
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}
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static void rotate_window(uint32_t delta)
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{
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rotate_window_abs(env->sregs[WINDOW_BASE] + delta);
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}
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void HELPER(wsr_windowbase)(uint32_t v)
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{
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rotate_window_abs(v);
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}
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void HELPER(entry)(uint32_t pc, uint32_t s, uint32_t imm)
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{
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int callinc = (env->sregs[PS] & PS_CALLINC) >> PS_CALLINC_SHIFT;
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if (s > 3 || ((env->sregs[PS] & (PS_WOE | PS_EXCM)) ^ PS_WOE) != 0) {
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qemu_log("Illegal entry instruction(pc = %08x), PS = %08x\n",
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pc, env->sregs[PS]);
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HELPER(exception_cause)(pc, ILLEGAL_INSTRUCTION_CAUSE);
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} else {
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env->regs[(callinc << 2) | (s & 3)] = env->regs[s] - (imm << 3);
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rotate_window(callinc);
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env->sregs[WINDOW_START] |=
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windowstart_bit(env->sregs[WINDOW_BASE], env);
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}
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}
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void HELPER(window_check)(uint32_t pc, uint32_t w)
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{
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uint32_t windowbase = windowbase_bound(env->sregs[WINDOW_BASE], env);
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uint32_t windowstart = env->sregs[WINDOW_START];
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uint32_t m, n;
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if ((env->sregs[PS] & (PS_WOE | PS_EXCM)) ^ PS_WOE) {
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return;
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}
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for (n = 1; ; ++n) {
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if (n > w) {
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return;
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}
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if (windowstart & windowstart_bit(windowbase + n, env)) {
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break;
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}
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}
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m = windowbase_bound(windowbase + n, env);
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rotate_window(n);
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env->sregs[PS] = (env->sregs[PS] & ~PS_OWB) |
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(windowbase << PS_OWB_SHIFT) | PS_EXCM;
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env->sregs[EPC1] = env->pc = pc;
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if (windowstart & windowstart_bit(m + 1, env)) {
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HELPER(exception)(EXC_WINDOW_OVERFLOW4);
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} else if (windowstart & windowstart_bit(m + 2, env)) {
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HELPER(exception)(EXC_WINDOW_OVERFLOW8);
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} else {
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HELPER(exception)(EXC_WINDOW_OVERFLOW12);
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}
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}
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uint32_t HELPER(retw)(uint32_t pc)
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{
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int n = (env->regs[0] >> 30) & 0x3;
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int m = 0;
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uint32_t windowbase = windowbase_bound(env->sregs[WINDOW_BASE], env);
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uint32_t windowstart = env->sregs[WINDOW_START];
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uint32_t ret_pc = 0;
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if (windowstart & windowstart_bit(windowbase - 1, env)) {
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m = 1;
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} else if (windowstart & windowstart_bit(windowbase - 2, env)) {
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m = 2;
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} else if (windowstart & windowstart_bit(windowbase - 3, env)) {
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m = 3;
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}
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if (n == 0 || (m != 0 && m != n) ||
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((env->sregs[PS] & (PS_WOE | PS_EXCM)) ^ PS_WOE) != 0) {
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qemu_log("Illegal retw instruction(pc = %08x), "
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"PS = %08x, m = %d, n = %d\n",
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pc, env->sregs[PS], m, n);
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HELPER(exception_cause)(pc, ILLEGAL_INSTRUCTION_CAUSE);
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} else {
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int owb = windowbase;
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ret_pc = (pc & 0xc0000000) | (env->regs[0] & 0x3fffffff);
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rotate_window(-n);
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if (windowstart & windowstart_bit(env->sregs[WINDOW_BASE], env)) {
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env->sregs[WINDOW_START] &= ~windowstart_bit(owb, env);
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} else {
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/* window underflow */
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env->sregs[PS] = (env->sregs[PS] & ~PS_OWB) |
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(windowbase << PS_OWB_SHIFT) | PS_EXCM;
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env->sregs[EPC1] = env->pc = pc;
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if (n == 1) {
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HELPER(exception)(EXC_WINDOW_UNDERFLOW4);
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} else if (n == 2) {
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HELPER(exception)(EXC_WINDOW_UNDERFLOW8);
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} else if (n == 3) {
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HELPER(exception)(EXC_WINDOW_UNDERFLOW12);
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}
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}
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}
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return ret_pc;
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}
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void HELPER(rotw)(uint32_t imm4)
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{
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rotate_window(imm4);
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}
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void HELPER(restore_owb)(void)
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{
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rotate_window_abs((env->sregs[PS] & PS_OWB) >> PS_OWB_SHIFT);
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}
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void HELPER(movsp)(uint32_t pc)
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{
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if ((env->sregs[WINDOW_START] &
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(windowstart_bit(env->sregs[WINDOW_BASE] - 3, env) |
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windowstart_bit(env->sregs[WINDOW_BASE] - 2, env) |
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windowstart_bit(env->sregs[WINDOW_BASE] - 1, env))) == 0) {
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HELPER(exception_cause)(pc, ALLOCA_CAUSE);
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}
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}
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void HELPER(dump_state)(void)
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{
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cpu_dump_state(env, stderr, fprintf, 0);
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}
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