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qemu/target-xtensa/op_helper.c

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/*
* Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Open Source and Linux Lab nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "cpu.h"
#include "dyngen-exec.h"
#include "helpers.h"
#include "host-utils.h"
static void do_unaligned_access(target_ulong addr, int is_write, int is_user,
void *retaddr);
#define ALIGNED_ONLY
#define MMUSUFFIX _mmu
#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"
static void do_restore_state(void *pc_ptr)
{
TranslationBlock *tb;
uint32_t pc = (uint32_t)(intptr_t)pc_ptr;
tb = tb_find_pc(pc);
if (tb) {
cpu_restore_state(tb, env, pc);
}
}
static void do_unaligned_access(target_ulong addr, int is_write, int is_user,
void *retaddr)
{
if (xtensa_option_enabled(env->config, XTENSA_OPTION_UNALIGNED_EXCEPTION) &&
!xtensa_option_enabled(env->config, XTENSA_OPTION_HW_ALIGNMENT)) {
do_restore_state(retaddr);
HELPER(exception_cause_vaddr)(
env->pc, LOAD_STORE_ALIGNMENT_CAUSE, addr);
}
}
void tlb_fill(CPUState *env1, target_ulong vaddr, int is_write, int mmu_idx,
void *retaddr)
{
CPUState *saved_env = env;
env = env1;
{
uint32_t paddr;
uint32_t page_size;
unsigned access;
int ret = xtensa_get_physical_addr(env, vaddr, is_write, mmu_idx,
&paddr, &page_size, &access);
qemu_log("%s(%08x, %d, %d) -> %08x, ret = %d\n", __func__,
vaddr, is_write, mmu_idx, paddr, ret);
if (ret == 0) {
tlb_set_page(env,
vaddr & TARGET_PAGE_MASK,
paddr & TARGET_PAGE_MASK,
access, mmu_idx, page_size);
} else {
do_restore_state(retaddr);
HELPER(exception_cause_vaddr)(env->pc, ret, vaddr);
}
}
env = saved_env;
}
void HELPER(exception)(uint32_t excp)
{
env->exception_index = excp;
cpu_loop_exit(env);
}
void HELPER(exception_cause)(uint32_t pc, uint32_t cause)
{
uint32_t vector;
env->pc = pc;
if (env->sregs[PS] & PS_EXCM) {
if (env->config->ndepc) {
env->sregs[DEPC] = pc;
} else {
env->sregs[EPC1] = pc;
}
vector = EXC_DOUBLE;
} else {
env->sregs[EPC1] = pc;
vector = (env->sregs[PS] & PS_UM) ? EXC_USER : EXC_KERNEL;
}
env->sregs[EXCCAUSE] = cause;
env->sregs[PS] |= PS_EXCM;
HELPER(exception)(vector);
}
void HELPER(exception_cause_vaddr)(uint32_t pc, uint32_t cause, uint32_t vaddr)
{
env->sregs[EXCVADDR] = vaddr;
HELPER(exception_cause)(pc, cause);
}
uint32_t HELPER(nsa)(uint32_t v)
{
if (v & 0x80000000) {
v = ~v;
}
return v ? clz32(v) - 1 : 31;
}
uint32_t HELPER(nsau)(uint32_t v)
{
return v ? clz32(v) : 32;
}
static void copy_window_from_phys(CPUState *env,
uint32_t window, uint32_t phys, uint32_t n)
{
assert(phys < env->config->nareg);
if (phys + n <= env->config->nareg) {
memcpy(env->regs + window, env->phys_regs + phys,
n * sizeof(uint32_t));
} else {
uint32_t n1 = env->config->nareg - phys;
memcpy(env->regs + window, env->phys_regs + phys,
n1 * sizeof(uint32_t));
memcpy(env->regs + window + n1, env->phys_regs,
(n - n1) * sizeof(uint32_t));
}
}
static void copy_phys_from_window(CPUState *env,
uint32_t phys, uint32_t window, uint32_t n)
{
assert(phys < env->config->nareg);
if (phys + n <= env->config->nareg) {
memcpy(env->phys_regs + phys, env->regs + window,
n * sizeof(uint32_t));
} else {
uint32_t n1 = env->config->nareg - phys;
memcpy(env->phys_regs + phys, env->regs + window,
n1 * sizeof(uint32_t));
memcpy(env->phys_regs, env->regs + window + n1,
(n - n1) * sizeof(uint32_t));
}
}
static inline unsigned windowbase_bound(unsigned a, const CPUState *env)
{
return a & (env->config->nareg / 4 - 1);
}
static inline unsigned windowstart_bit(unsigned a, const CPUState *env)
{
return 1 << windowbase_bound(a, env);
}
void xtensa_sync_window_from_phys(CPUState *env)
{
copy_window_from_phys(env, 0, env->sregs[WINDOW_BASE] * 4, 16);
}
void xtensa_sync_phys_from_window(CPUState *env)
{
copy_phys_from_window(env, env->sregs[WINDOW_BASE] * 4, 0, 16);
}
static void rotate_window_abs(uint32_t position)
{
xtensa_sync_phys_from_window(env);
env->sregs[WINDOW_BASE] = windowbase_bound(position, env);
xtensa_sync_window_from_phys(env);
}
static void rotate_window(uint32_t delta)
{
rotate_window_abs(env->sregs[WINDOW_BASE] + delta);
}
void HELPER(wsr_windowbase)(uint32_t v)
{
rotate_window_abs(v);
}
void HELPER(entry)(uint32_t pc, uint32_t s, uint32_t imm)
{
int callinc = (env->sregs[PS] & PS_CALLINC) >> PS_CALLINC_SHIFT;
if (s > 3 || ((env->sregs[PS] & (PS_WOE | PS_EXCM)) ^ PS_WOE) != 0) {
qemu_log("Illegal entry instruction(pc = %08x), PS = %08x\n",
pc, env->sregs[PS]);
HELPER(exception_cause)(pc, ILLEGAL_INSTRUCTION_CAUSE);
} else {
env->regs[(callinc << 2) | (s & 3)] = env->regs[s] - (imm << 3);
rotate_window(callinc);
env->sregs[WINDOW_START] |=
windowstart_bit(env->sregs[WINDOW_BASE], env);
}
}
void HELPER(window_check)(uint32_t pc, uint32_t w)
{
uint32_t windowbase = windowbase_bound(env->sregs[WINDOW_BASE], env);
uint32_t windowstart = env->sregs[WINDOW_START];
uint32_t m, n;
if ((env->sregs[PS] & (PS_WOE | PS_EXCM)) ^ PS_WOE) {
return;
}
for (n = 1; ; ++n) {
if (n > w) {
return;
}
if (windowstart & windowstart_bit(windowbase + n, env)) {
break;
}
}
m = windowbase_bound(windowbase + n, env);
rotate_window(n);
env->sregs[PS] = (env->sregs[PS] & ~PS_OWB) |
(windowbase << PS_OWB_SHIFT) | PS_EXCM;
env->sregs[EPC1] = env->pc = pc;
if (windowstart & windowstart_bit(m + 1, env)) {
HELPER(exception)(EXC_WINDOW_OVERFLOW4);
} else if (windowstart & windowstart_bit(m + 2, env)) {
HELPER(exception)(EXC_WINDOW_OVERFLOW8);
} else {
HELPER(exception)(EXC_WINDOW_OVERFLOW12);
}
}
uint32_t HELPER(retw)(uint32_t pc)
{
int n = (env->regs[0] >> 30) & 0x3;
int m = 0;
uint32_t windowbase = windowbase_bound(env->sregs[WINDOW_BASE], env);
uint32_t windowstart = env->sregs[WINDOW_START];
uint32_t ret_pc = 0;
if (windowstart & windowstart_bit(windowbase - 1, env)) {
m = 1;
} else if (windowstart & windowstart_bit(windowbase - 2, env)) {
m = 2;
} else if (windowstart & windowstart_bit(windowbase - 3, env)) {
m = 3;
}
if (n == 0 || (m != 0 && m != n) ||
((env->sregs[PS] & (PS_WOE | PS_EXCM)) ^ PS_WOE) != 0) {
qemu_log("Illegal retw instruction(pc = %08x), "
"PS = %08x, m = %d, n = %d\n",
pc, env->sregs[PS], m, n);
HELPER(exception_cause)(pc, ILLEGAL_INSTRUCTION_CAUSE);
} else {
int owb = windowbase;
ret_pc = (pc & 0xc0000000) | (env->regs[0] & 0x3fffffff);
rotate_window(-n);
if (windowstart & windowstart_bit(env->sregs[WINDOW_BASE], env)) {
env->sregs[WINDOW_START] &= ~windowstart_bit(owb, env);
} else {
/* window underflow */
env->sregs[PS] = (env->sregs[PS] & ~PS_OWB) |
(windowbase << PS_OWB_SHIFT) | PS_EXCM;
env->sregs[EPC1] = env->pc = pc;
if (n == 1) {
HELPER(exception)(EXC_WINDOW_UNDERFLOW4);
} else if (n == 2) {
HELPER(exception)(EXC_WINDOW_UNDERFLOW8);
} else if (n == 3) {
HELPER(exception)(EXC_WINDOW_UNDERFLOW12);
}
}
}
return ret_pc;
}
void HELPER(rotw)(uint32_t imm4)
{
rotate_window(imm4);
}
void HELPER(restore_owb)(void)
{
rotate_window_abs((env->sregs[PS] & PS_OWB) >> PS_OWB_SHIFT);
}
void HELPER(movsp)(uint32_t pc)
{
if ((env->sregs[WINDOW_START] &
(windowstart_bit(env->sregs[WINDOW_BASE] - 3, env) |
windowstart_bit(env->sregs[WINDOW_BASE] - 2, env) |
windowstart_bit(env->sregs[WINDOW_BASE] - 1, env))) == 0) {
HELPER(exception_cause)(pc, ALLOCA_CAUSE);
}
}
void HELPER(wsr_lbeg)(uint32_t v)
{
if (env->sregs[LBEG] != v) {
tb_invalidate_phys_page_range(
env->sregs[LEND] - 1, env->sregs[LEND], 0);
env->sregs[LBEG] = v;
}
}
void HELPER(wsr_lend)(uint32_t v)
{
if (env->sregs[LEND] != v) {
tb_invalidate_phys_page_range(
env->sregs[LEND] - 1, env->sregs[LEND], 0);
env->sregs[LEND] = v;
tb_invalidate_phys_page_range(
env->sregs[LEND] - 1, env->sregs[LEND], 0);
}
}
void HELPER(dump_state)(void)
{
cpu_dump_state(env, stderr, fprintf, 0);
}
void HELPER(waiti)(uint32_t pc, uint32_t intlevel)
{
env->pc = pc;
env->sregs[PS] = (env->sregs[PS] & ~PS_INTLEVEL) |
(intlevel << PS_INTLEVEL_SHIFT);
check_interrupts(env);
if (env->pending_irq_level) {
cpu_loop_exit(env);
return;
}
if (xtensa_option_enabled(env->config, XTENSA_OPTION_TIMER_INTERRUPT)) {
int i;
uint32_t wake_ccount = env->sregs[CCOUNT] - 1;
for (i = 0; i < env->config->nccompare; ++i) {
if (env->sregs[CCOMPARE + i] - env->sregs[CCOUNT] <
wake_ccount - env->sregs[CCOUNT]) {
wake_ccount = env->sregs[CCOMPARE + i];
}
}
env->wake_ccount = wake_ccount;
qemu_mod_timer(env->ccompare_timer, qemu_get_clock_ns(vm_clock) +
muldiv64(wake_ccount - env->sregs[CCOUNT],
1000000, env->config->clock_freq_khz));
}
env->halt_clock = qemu_get_clock_ns(vm_clock);
env->halted = 1;
HELPER(exception)(EXCP_HLT);
}
void HELPER(timer_irq)(uint32_t id, uint32_t active)
{
xtensa_timer_irq(env, id, active);
}
void HELPER(advance_ccount)(uint32_t d)
{
xtensa_advance_ccount(env, d);
}
void HELPER(check_interrupts)(CPUState *env)
{
check_interrupts(env);
}
void HELPER(wsr_rasid)(uint32_t v)
{
v = (v & 0xffffff00) | 0x1;
if (v != env->sregs[RASID]) {
env->sregs[RASID] = v;
tlb_flush(env, 1);
}
}
static uint32_t get_page_size(const CPUState *env, bool dtlb, uint32_t way)
{
uint32_t tlbcfg = env->sregs[dtlb ? DTLBCFG : ITLBCFG];
switch (way) {
case 4:
return (tlbcfg >> 16) & 0x3;
case 5:
return (tlbcfg >> 20) & 0x1;
case 6:
return (tlbcfg >> 24) & 0x1;
default:
return 0;
}
}
/*!
* Get bit mask for the virtual address bits translated by the TLB way
*/
uint32_t xtensa_tlb_get_addr_mask(const CPUState *env, bool dtlb, uint32_t way)
{
if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {
bool varway56 = dtlb ?
env->config->dtlb.varway56 :
env->config->itlb.varway56;
switch (way) {
case 4:
return 0xfff00000 << get_page_size(env, dtlb, way) * 2;
case 5:
if (varway56) {
return 0xf8000000 << get_page_size(env, dtlb, way);
} else {
return 0xf8000000;
}
case 6:
if (varway56) {
return 0xf0000000 << (1 - get_page_size(env, dtlb, way));
} else {
return 0xf0000000;
}
default:
return 0xfffff000;
}
} else {
return REGION_PAGE_MASK;
}
}
/*!
* Get bit mask for the 'VPN without index' field.
* See ISA, 4.6.5.6, data format for RxTLB0
*/
static uint32_t get_vpn_mask(const CPUState *env, bool dtlb, uint32_t way)
{
if (way < 4) {
bool is32 = (dtlb ?
env->config->dtlb.nrefillentries :
env->config->itlb.nrefillentries) == 32;
return is32 ? 0xffff8000 : 0xffffc000;
} else if (way == 4) {
return xtensa_tlb_get_addr_mask(env, dtlb, way) << 2;
} else if (way <= 6) {
uint32_t mask = xtensa_tlb_get_addr_mask(env, dtlb, way);
bool varway56 = dtlb ?
env->config->dtlb.varway56 :
env->config->itlb.varway56;
if (varway56) {
return mask << (way == 5 ? 2 : 3);
} else {
return mask << 1;
}
} else {
return 0xfffff000;
}
}
/*!
* Split virtual address into VPN (with index) and entry index
* for the given TLB way
*/
void split_tlb_entry_spec_way(const CPUState *env, uint32_t v, bool dtlb,
uint32_t *vpn, uint32_t wi, uint32_t *ei)
{
bool varway56 = dtlb ?
env->config->dtlb.varway56 :
env->config->itlb.varway56;
if (!dtlb) {
wi &= 7;
}
if (wi < 4) {
bool is32 = (dtlb ?
env->config->dtlb.nrefillentries :
env->config->itlb.nrefillentries) == 32;
*ei = (v >> 12) & (is32 ? 0x7 : 0x3);
} else {
switch (wi) {
case 4:
{
uint32_t eibase = 20 + get_page_size(env, dtlb, wi) * 2;
*ei = (v >> eibase) & 0x3;
}
break;
case 5:
if (varway56) {
uint32_t eibase = 27 + get_page_size(env, dtlb, wi);
*ei = (v >> eibase) & 0x3;
} else {
*ei = (v >> 27) & 0x1;
}
break;
case 6:
if (varway56) {
uint32_t eibase = 29 - get_page_size(env, dtlb, wi);
*ei = (v >> eibase) & 0x7;
} else {
*ei = (v >> 28) & 0x1;
}
break;
default:
*ei = 0;
break;
}
}
*vpn = v & xtensa_tlb_get_addr_mask(env, dtlb, wi);
}
/*!
* Split TLB address into TLB way, entry index and VPN (with index).
* See ISA, 4.6.5.5 - 4.6.5.8 for the TLB addressing format
*/
static void split_tlb_entry_spec(uint32_t v, bool dtlb,
uint32_t *vpn, uint32_t *wi, uint32_t *ei)
{
if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {
*wi = v & (dtlb ? 0xf : 0x7);
split_tlb_entry_spec_way(env, v, dtlb, vpn, *wi, ei);
} else {
*vpn = v & REGION_PAGE_MASK;
*wi = 0;
*ei = (v >> 29) & 0x7;
}
}
static xtensa_tlb_entry *get_tlb_entry(uint32_t v, bool dtlb, uint32_t *pwi)
{
uint32_t vpn;
uint32_t wi;
uint32_t ei;
split_tlb_entry_spec(v, dtlb, &vpn, &wi, &ei);
if (pwi) {
*pwi = wi;
}
return xtensa_tlb_get_entry(env, dtlb, wi, ei);
}
uint32_t HELPER(rtlb0)(uint32_t v, uint32_t dtlb)
{
if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {
uint32_t wi;
const xtensa_tlb_entry *entry = get_tlb_entry(v, dtlb, &wi);
return (entry->vaddr & get_vpn_mask(env, dtlb, wi)) | entry->asid;
} else {
return v & REGION_PAGE_MASK;
}
}
uint32_t HELPER(rtlb1)(uint32_t v, uint32_t dtlb)
{
const xtensa_tlb_entry *entry = get_tlb_entry(v, dtlb, NULL);
return entry->paddr | entry->attr;
}
void HELPER(itlb)(uint32_t v, uint32_t dtlb)
{
if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {
uint32_t wi;
xtensa_tlb_entry *entry = get_tlb_entry(v, dtlb, &wi);
if (entry->variable && entry->asid) {
tlb_flush_page(env, entry->vaddr);
entry->asid = 0;
}
}
}
uint32_t HELPER(ptlb)(uint32_t v, uint32_t dtlb)
{
if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {
uint32_t wi;
uint32_t ei;
uint8_t ring;
int res = xtensa_tlb_lookup(env, v, dtlb, &wi, &ei, &ring);
switch (res) {
case 0:
if (ring >= xtensa_get_ring(env)) {
return (v & 0xfffff000) | wi | (dtlb ? 0x10 : 0x8);
}
break;
case INST_TLB_MULTI_HIT_CAUSE:
case LOAD_STORE_TLB_MULTI_HIT_CAUSE:
HELPER(exception_cause_vaddr)(env->pc, res, v);
break;
}
return 0;
} else {
return (v & REGION_PAGE_MASK) | 0x1;
}
}
void xtensa_tlb_set_entry(CPUState *env, bool dtlb,
unsigned wi, unsigned ei, uint32_t vpn, uint32_t pte)
{
xtensa_tlb_entry *entry = xtensa_tlb_get_entry(env, dtlb, wi, ei);
if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {
if (entry->variable) {
if (entry->asid) {
tlb_flush_page(env, entry->vaddr);
}
entry->vaddr = vpn;
entry->paddr = pte & xtensa_tlb_get_addr_mask(env, dtlb, wi);
entry->asid = (env->sregs[RASID] >> ((pte >> 1) & 0x18)) & 0xff;
entry->attr = pte & 0xf;
} else {
qemu_log("%s %d, %d, %d trying to set immutable entry\n",
__func__, dtlb, wi, ei);
}
} else {
tlb_flush_page(env, entry->vaddr);
if (xtensa_option_enabled(env->config,
XTENSA_OPTION_REGION_TRANSLATION)) {
entry->paddr = pte & REGION_PAGE_MASK;
}
entry->attr = pte & 0xf;
}
}
void HELPER(wtlb)(uint32_t p, uint32_t v, uint32_t dtlb)
{
uint32_t vpn;
uint32_t wi;
uint32_t ei;
split_tlb_entry_spec(v, dtlb, &vpn, &wi, &ei);
xtensa_tlb_set_entry(env, dtlb, wi, ei, vpn, p);
}
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