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qemu/target-mips/op_helper.c
bellard 90b37806ba fixed C0 status codes (Ralf Baechle) 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1473 c046a42c-6fe2-441c-8c8c-71466251a162
2005-07-02 15:22:34 +00:00

635 lines
15 KiB
C
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/*
* MIPS emulation helpers for qemu.
*
* Copyright (c) 2004-2005 Jocelyn Mayer
*
* 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 <math.h>
#include "exec.h"
#define MIPS_DEBUG_DISAS
/*****************************************************************************/
/* Exceptions processing helpers */
void cpu_loop_exit(void)
{
longjmp(env->jmp_env, 1);
}
__attribute__ (( regparm(2) ))
void do_raise_exception_err (uint32_t exception, int error_code)
{
#if 1
if (logfile && exception < 0x100)
fprintf(logfile, "%s: %d %d\n", __func__, exception, error_code);
#endif
env->exception_index = exception;
env->error_code = error_code;
T0 = 0;
cpu_loop_exit();
}
__attribute__ (( regparm(1) ))
void do_raise_exception (uint32_t exception)
{
do_raise_exception_err(exception, 0);
}
#define MEMSUFFIX _raw
#include "op_helper_mem.c"
#undef MEMSUFFIX
#if !defined(CONFIG_USER_ONLY)
#define MEMSUFFIX _user
#include "op_helper_mem.c"
#undef MEMSUFFIX
#define MEMSUFFIX _kernel
#include "op_helper_mem.c"
#undef MEMSUFFIX
#endif
/* 64 bits arithmetic for 32 bits hosts */
#if (HOST_LONG_BITS == 32)
static inline uint64_t get_HILO (void)
{
return ((uint64_t)env->HI << 32) | (uint64_t)env->LO;
}
static inline void set_HILO (uint64_t HILO)
{
env->LO = HILO & 0xFFFFFFFF;
env->HI = HILO >> 32;
}
void do_mult (void)
{
set_HILO((int64_t)T0 * (int64_t)T1);
}
void do_multu (void)
{
set_HILO((uint64_t)T0 * (uint64_t)T1);
}
void do_madd (void)
{
int64_t tmp;
tmp = ((int64_t)T0 * (int64_t)T1);
set_HILO((int64_t)get_HILO() + tmp);
}
void do_maddu (void)
{
uint64_t tmp;
tmp = ((uint64_t)T0 * (uint64_t)T1);
set_HILO(get_HILO() + tmp);
}
void do_msub (void)
{
int64_t tmp;
tmp = ((int64_t)T0 * (int64_t)T1);
set_HILO((int64_t)get_HILO() - tmp);
}
void do_msubu (void)
{
uint64_t tmp;
tmp = ((uint64_t)T0 * (uint64_t)T1);
set_HILO(get_HILO() - tmp);
}
#endif
/* CP0 helpers */
__attribute__ (( regparm(2) ))
void do_mfc0 (int reg, int sel)
{
const unsigned char *rn;
if (sel != 0 && reg != 16 && reg != 28) {
rn = "invalid";
goto print;
}
switch (reg) {
case 0:
T0 = env->CP0_index;
rn = "Index";
break;
case 1:
T0 = cpu_mips_get_random(env);
rn = "Random";
break;
case 2:
T0 = env->CP0_EntryLo0;
rn = "EntryLo0";
break;
case 3:
T0 = env->CP0_EntryLo1;
rn = "EntryLo1";
break;
case 4:
T0 = env->CP0_Context;
rn = "Context";
break;
case 5:
T0 = env->CP0_PageMask;
rn = "PageMask";
break;
case 6:
T0 = env->CP0_Wired;
rn = "Wired";
break;
case 8:
T0 = env->CP0_BadVAddr;
rn = "BadVaddr";
break;
case 9:
T0 = cpu_mips_get_count(env);
rn = "Count";
break;
case 10:
T0 = env->CP0_EntryHi;
rn = "EntryHi";
break;
case 11:
T0 = env->CP0_Compare;
rn = "Compare";
break;
case 12:
T0 = env->CP0_Status;
if (env->hflags & MIPS_HFLAG_UM)
T0 |= (1 << CP0St_UM);
if (env->hflags & MIPS_HFLAG_ERL)
T0 |= (1 << CP0St_ERL);
if (env->hflags & MIPS_HFLAG_EXL)
T0 |= (1 << CP0St_EXL);
rn = "Status";
break;
case 13:
T0 = env->CP0_Cause;
rn = "Cause";
break;
case 14:
T0 = env->CP0_EPC;
rn = "EPC";
break;
case 15:
T0 = env->CP0_PRid;
rn = "PRid";
break;
case 16:
switch (sel) {
case 0:
T0 = env->CP0_Config0;
rn = "Config";
break;
case 1:
T0 = env->CP0_Config1;
rn = "Config1";
break;
default:
rn = "Unknown config register";
break;
}
break;
case 17:
T0 = env->CP0_LLAddr >> 4;
rn = "LLAddr";
break;
case 18:
T0 = env->CP0_WatchLo;
rn = "WatchLo";
break;
case 19:
T0 = env->CP0_WatchHi;
rn = "WatchHi";
break;
case 23:
T0 = env->CP0_Debug;
if (env->hflags & MIPS_HFLAG_DM)
T0 |= 1 << CP0DB_DM;
rn = "Debug";
break;
case 24:
T0 = env->CP0_DEPC;
rn = "DEPC";
break;
case 28:
switch (sel) {
case 0:
T0 = env->CP0_TagLo;
rn = "TagLo";
break;
case 1:
T0 = env->CP0_DataLo;
rn = "DataLo";
break;
default:
rn = "unknown sel";
break;
}
break;
case 30:
T0 = env->CP0_ErrorEPC;
rn = "ErrorEPC";
break;
case 31:
T0 = env->CP0_DESAVE;
rn = "DESAVE";
break;
default:
rn = "unknown";
break;
}
print:
#if defined MIPS_DEBUG_DISAS
if (loglevel & CPU_LOG_TB_IN_ASM) {
fprintf(logfile, "%08x mfc0 %s => %08x (%d %d)\n",
env->PC, rn, T0, reg, sel);
}
#endif
return;
}
__attribute__ (( regparm(2) ))
void do_mtc0 (int reg, int sel)
{
const unsigned char *rn;
uint32_t val, old, mask;
int i, raise;
if (sel != 0 && reg != 16 && reg != 28) {
val = -1;
old = -1;
rn = "invalid";
goto print;
}
switch (reg) {
case 0:
val = (env->CP0_index & 0x80000000) | (T0 & 0x0000000F);
old = env->CP0_index;
env->CP0_index = val;
rn = "Index";
break;
case 2:
val = T0 & 0x03FFFFFFF;
old = env->CP0_EntryLo0;
env->CP0_EntryLo0 = val;
rn = "EntryLo0";
break;
case 3:
val = T0 & 0x03FFFFFFF;
old = env->CP0_EntryLo1;
env->CP0_EntryLo1 = val;
rn = "EntryLo1";
break;
case 4:
val = (env->CP0_Context & 0xFF000000) | (T0 & 0x00FFFFF0);
old = env->CP0_Context;
env->CP0_Context = val;
rn = "Context";
break;
case 5:
val = T0 & 0x01FFE000;
old = env->CP0_PageMask;
env->CP0_PageMask = val;
rn = "PageMask";
break;
case 6:
val = T0 & 0x0000000F;
old = env->CP0_Wired;
env->CP0_Wired = val;
rn = "Wired";
break;
case 9:
val = T0;
old = cpu_mips_get_count(env);
cpu_mips_store_count(env, val);
rn = "Count";
break;
case 10:
val = T0 & 0xFFFFF0FF;
old = env->CP0_EntryHi;
env->CP0_EntryHi = val;
rn = "EntryHi";
break;
case 11:
val = T0;
old = env->CP0_Compare;
cpu_mips_store_compare(env, val);
rn = "Compare";
break;
case 12:
val = T0 & 0xFA78FF01;
if (T0 & (1 << CP0St_UM))
env->hflags |= MIPS_HFLAG_UM;
else
env->hflags &= ~MIPS_HFLAG_UM;
if (T0 & (1 << CP0St_ERL))
env->hflags |= MIPS_HFLAG_ERL;
else
env->hflags &= ~MIPS_HFLAG_ERL;
if (T0 & (1 << CP0St_EXL))
env->hflags |= MIPS_HFLAG_EXL;
else
env->hflags &= ~MIPS_HFLAG_EXL;
old = env->CP0_Status;
env->CP0_Status = val;
/* If we unmasked an asserted IRQ, raise it */
mask = 0x0000FF00;
if (loglevel & CPU_LOG_TB_IN_ASM) {
fprintf(logfile, "Status %08x => %08x Cause %08x (%08x %08x %08x)\n",
old, val, env->CP0_Cause, old & mask, val & mask,
env->CP0_Cause & mask);
}
#if 1
if ((val & (1 << CP0St_IE)) && !(old & (1 << CP0St_IE)) &&
!(env->hflags & MIPS_HFLAG_EXL) &&
!(env->hflags & MIPS_HFLAG_ERL) &&
!(env->hflags & MIPS_HFLAG_DM) &&
(env->CP0_Cause & mask)) {
if (logfile)
fprintf(logfile, "Raise pending IRQs\n");
env->interrupt_request |= CPU_INTERRUPT_HARD;
do_raise_exception(EXCP_EXT_INTERRUPT);
} else if (!(val & 0x00000001) && (old & 0x00000001)) {
env->interrupt_request &= ~CPU_INTERRUPT_HARD;
}
#endif
rn = "Status";
break;
case 13:
val = (env->CP0_Cause & 0xB000F87C) | (T0 & 0x000C00300);
old = env->CP0_Cause;
env->CP0_Cause = val;
#if 0
/* Check if we ever asserted a software IRQ */
for (i = 0; i < 2; i++) {
mask = 0x100 << i;
if ((val & mask) & !(old & mask))
mips_set_irq(i);
}
#endif
rn = "Cause";
break;
case 14:
val = T0;
old = env->CP0_EPC;
env->CP0_EPC = val;
rn = "EPC";
break;
case 16:
switch (sel) {
case 0:
#if defined(MIPS_USES_R4K_TLB)
val = (env->CP0_Config0 & 0x8017FF80) | (T0 & 0x7E000001);
#else
val = (env->CP0_Config0 & 0xFE17FF80) | (T0 & 0x00000001);
#endif
old = env->CP0_Config0;
env->CP0_Config0 = val;
rn = "Config0";
break;
default:
val = -1;
old = -1;
rn = "bad config selector";
break;
}
break;
case 18:
val = T0;
old = env->CP0_WatchLo;
env->CP0_WatchLo = val;
rn = "WatchLo";
break;
case 19:
val = T0 & 0x40FF0FF8;
old = env->CP0_WatchHi;
env->CP0_WatchHi = val;
rn = "WatchHi";
break;
case 23:
val = (env->CP0_Debug & 0x8C03FC1F) | (T0 & 0x13300120);
if (T0 & (1 << CP0DB_DM))
env->hflags |= MIPS_HFLAG_DM;
else
env->hflags &= ~MIPS_HFLAG_DM;
old = env->CP0_Debug;
env->CP0_Debug = val;
rn = "Debug";
break;
case 24:
val = T0;
old = env->CP0_DEPC;
env->CP0_DEPC = val;
rn = "DEPC";
break;
case 28:
switch (sel) {
case 0:
val = T0 & 0xFFFFFCF6;
old = env->CP0_TagLo;
env->CP0_TagLo = val;
rn = "TagLo";
break;
default:
val = -1;
old = -1;
rn = "invalid sel";
break;
}
break;
case 30:
val = T0;
old = env->CP0_ErrorEPC;
env->CP0_ErrorEPC = val;
rn = "EPC";
break;
case 31:
val = T0;
old = env->CP0_DESAVE;
env->CP0_DESAVE = val;
rn = "DESAVE";
break;
default:
val = -1;
old = -1;
rn = "unknown";
break;
}
print:
#if defined MIPS_DEBUG_DISAS
if (loglevel & CPU_LOG_TB_IN_ASM) {
fprintf(logfile, "%08x mtc0 %s %08x => %08x (%d %d %08x)\n",
env->PC, rn, T0, val, reg, sel, old);
}
#endif
return;
}
/* TLB management */
#if defined(MIPS_USES_R4K_TLB)
__attribute__ (( regparm(1) ))
static void invalidate_tb (int idx)
{
tlb_t *tlb;
target_ulong addr, end;
tlb = &env->tlb[idx];
if (tlb->V[0]) {
addr = tlb->PFN[0];
end = addr + (tlb->end - tlb->VPN);
tb_invalidate_page_range(addr, end);
}
if (tlb->V[1]) {
addr = tlb->PFN[1];
end = addr + (tlb->end - tlb->VPN);
tb_invalidate_page_range(addr, end);
}
}
__attribute__ (( regparm(1) ))
static void fill_tb (int idx)
{
tlb_t *tlb;
int size;
/* XXX: detect conflicting TLBs and raise a MCHECK exception when needed */
tlb = &env->tlb[idx];
tlb->VPN = env->CP0_EntryHi & 0xFFFFE000;
tlb->ASID = env->CP0_EntryHi & 0x000000FF;
size = env->CP0_PageMask >> 13;
size = 4 * (size + 1);
tlb->end = tlb->VPN + (1 << (8 + size));
tlb->G = env->CP0_EntryLo0 & env->CP0_EntryLo1 & 1;
tlb->V[0] = env->CP0_EntryLo0 & 2;
tlb->D[0] = env->CP0_EntryLo0 & 4;
tlb->C[0] = (env->CP0_EntryLo0 >> 3) & 0x7;
tlb->PFN[0] = (env->CP0_EntryLo0 >> 6) << 12;
tlb->V[1] = env->CP0_EntryLo1 & 2;
tlb->D[1] = env->CP0_EntryLo1 & 4;
tlb->C[1] = (env->CP0_EntryLo1 >> 3) & 0x7;
tlb->PFN[1] = (env->CP0_EntryLo1 >> 6) << 12;
}
void do_tlbwi (void)
{
invalidate_tb(env->CP0_index & 0xF);
fill_tb(env->CP0_index & 0xF);
}
void do_tlbwr (void)
{
int r = cpu_mips_get_random(env);
invalidate_tb(r);
fill_tb(r);
}
void do_tlbp (void)
{
tlb_t *tlb;
target_ulong tag;
uint8_t ASID;
int i;
tag = (env->CP0_EntryHi & 0xFFFFE000);
ASID = env->CP0_EntryHi & 0x000000FF;
for (i = 0; i < 16; i++) {
tlb = &env->tlb[i];
/* Check ASID, virtual page number & size */
if ((tlb->G == 1 || tlb->ASID == ASID) && tlb->VPN == tag) {
/* TLB match */
env->CP0_index = i;
break;
}
}
if (i == 16) {
env->CP0_index |= 0x80000000;
}
}
void do_tlbr (void)
{
tlb_t *tlb;
int size;
tlb = &env->tlb[env->CP0_index & 0xF];
env->CP0_EntryHi = tlb->VPN | tlb->ASID;
size = (tlb->end - tlb->VPN) >> 12;
env->CP0_PageMask = (size - 1) << 13;
env->CP0_EntryLo0 = tlb->V[0] | tlb->D[0] | (tlb->C[0] << 3) |
(tlb->PFN[0] >> 6);
env->CP0_EntryLo1 = tlb->V[1] | tlb->D[1] | (tlb->C[1] << 3) |
(tlb->PFN[1] >> 6);
}
#endif
__attribute__ (( regparm(1) ))
void op_dump_ldst (const unsigned char *func)
{
if (loglevel)
fprintf(logfile, "%s => %08x %08x\n", __func__, T0, T1);
}
void dump_sc (void)
{
if (loglevel) {
fprintf(logfile, "%s %08x at %08x (%08x)\n", __func__,
T1, T0, env->CP0_LLAddr);
}
}
void debug_eret (void)
{
if (loglevel) {
fprintf(logfile, "ERET: pc %08x EPC %08x ErrorEPC %08x (%d)\n",
env->PC, env->CP0_EPC, env->CP0_ErrorEPC,
env->hflags & MIPS_HFLAG_ERL ? 1 : 0);
}
}
__attribute__ (( regparm(1) ))
void do_pmon (int function)
{
function /= 2;
switch (function) {
case 2: /* TODO: char inbyte(int waitflag); */
if (env->gpr[4] == 0)
env->gpr[2] = -1;
/* Fall through */
case 11: /* TODO: char inbyte (void); */
env->gpr[2] = -1;
break;
case 3:
case 12:
printf("%c", env->gpr[4] & 0xFF);
break;
case 17:
break;
case 158:
{
unsigned char *fmt = (void *)env->gpr[4];
printf("%s", fmt);
}
break;
}
}
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