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/*
* Copyright (c) 2012-2014 Bastian Koppelmann C-Lab/University Paderborn
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include "cpu.h"
#include "qemu/host-utils.h"
#include "exec/helper-proto.h"
#include "exec/cpu_ldst.h"
#define SSOV(env, ret, arg, len) do { \
int64_t max_pos = INT##len ##_MAX; \
int64_t max_neg = INT##len ##_MIN; \
if (arg > max_pos) { \
env->PSW_USB_V = (1 << 31); \
env->PSW_USB_SV = (1 << 31); \
ret = (target_ulong)max_pos; \
} else { \
if (arg < max_neg) { \
env->PSW_USB_V = (1 << 31); \
env->PSW_USB_SV = (1 << 31); \
ret = (target_ulong)max_neg; \
} else { \
env->PSW_USB_V = 0; \
ret = (target_ulong)arg; \
} \
} \
env->PSW_USB_AV = arg ^ arg * 2u; \
env->PSW_USB_SAV |= env->PSW_USB_AV; \
} while (0)
target_ulong helper_add_ssov(CPUTriCoreState *env, target_ulong r1,
target_ulong r2)
{
target_ulong ret;
int64_t t1 = sextract64(r1, 0, 32);
int64_t t2 = sextract64(r2, 0, 32);
int64_t result = t1 + t2;
SSOV(env, ret, result, 32);
return ret;
}
target_ulong helper_sub_ssov(CPUTriCoreState *env, target_ulong r1,
target_ulong r2)
{
target_ulong ret;
int64_t t1 = sextract64(r1, 0, 32);
int64_t t2 = sextract64(r2, 0, 32);
int64_t result = t1 - t2;
SSOV(env, ret, result, 32);
return ret;
}
/* context save area (CSA) related helpers */
static int cdc_increment(target_ulong *psw)
{
if ((*psw & MASK_PSW_CDC) == 0x7f) {
return 0;
}
(*psw)++;
/* check for overflow */
int lo = clo32((*psw & MASK_PSW_CDC) << (32 - 7));
int mask = (1u << (7 - lo)) - 1;
int count = *psw & mask;
if (count == 0) {
(*psw)--;
return 1;
}
return 0;
}
static int cdc_decrement(target_ulong *psw)
{
if ((*psw & MASK_PSW_CDC) == 0x7f) {
return 0;
}
/* check for underflow */
int lo = clo32((*psw & MASK_PSW_CDC) << (32 - 7));
int mask = (1u << (7 - lo)) - 1;
int count = *psw & mask;
if (count == 0) {
return 1;
}
(*psw)--;
return 0;
}
static void save_context_upper(CPUTriCoreState *env, int ea,
target_ulong *new_FCX)
{
*new_FCX = cpu_ldl_data(env, ea);
cpu_stl_data(env, ea, env->PCXI);
cpu_stl_data(env, ea+4, env->PSW);
cpu_stl_data(env, ea+8, env->gpr_a[10]);
cpu_stl_data(env, ea+12, env->gpr_a[11]);
cpu_stl_data(env, ea+16, env->gpr_d[8]);
cpu_stl_data(env, ea+20, env->gpr_d[9]);
cpu_stl_data(env, ea+24, env->gpr_d[10]);
cpu_stl_data(env, ea+28, env->gpr_d[11]);
cpu_stl_data(env, ea+32, env->gpr_a[12]);
cpu_stl_data(env, ea+36, env->gpr_a[13]);
cpu_stl_data(env, ea+40, env->gpr_a[14]);
cpu_stl_data(env, ea+44, env->gpr_a[15]);
cpu_stl_data(env, ea+48, env->gpr_d[12]);
cpu_stl_data(env, ea+52, env->gpr_d[13]);
cpu_stl_data(env, ea+56, env->gpr_d[14]);
cpu_stl_data(env, ea+60, env->gpr_d[15]);
}
static void restore_context_upper(CPUTriCoreState *env, int ea,
target_ulong *new_PCXI, target_ulong *new_PSW)
{
*new_PCXI = cpu_ldl_data(env, ea);
*new_PSW = cpu_ldl_data(env, ea+4);
env->gpr_a[10] = cpu_ldl_data(env, ea+8);
env->gpr_a[11] = cpu_ldl_data(env, ea+12);
env->gpr_d[8] = cpu_ldl_data(env, ea+16);
env->gpr_d[9] = cpu_ldl_data(env, ea+20);
env->gpr_d[10] = cpu_ldl_data(env, ea+24);
env->gpr_d[11] = cpu_ldl_data(env, ea+28);
env->gpr_a[12] = cpu_ldl_data(env, ea+32);
env->gpr_a[13] = cpu_ldl_data(env, ea+36);
env->gpr_a[14] = cpu_ldl_data(env, ea+40);
env->gpr_a[15] = cpu_ldl_data(env, ea+44);
env->gpr_d[12] = cpu_ldl_data(env, ea+48);
env->gpr_d[13] = cpu_ldl_data(env, ea+52);
env->gpr_d[14] = cpu_ldl_data(env, ea+56);
env->gpr_d[15] = cpu_ldl_data(env, ea+60);
cpu_stl_data(env, ea, env->FCX);
}
void helper_call(CPUTriCoreState *env, uint32_t next_pc)
{
target_ulong tmp_FCX;
target_ulong ea;
target_ulong new_FCX;
target_ulong psw;
psw = psw_read(env);
/* if (FCX == 0) trap(FCU); */
if (env->FCX == 0) {
/* FCU trap */
}
/* if (PSW.CDE) then if (cdc_increment()) then trap(CDO); */
if (psw & MASK_PSW_CDE) {
if (cdc_increment(&psw)) {
/* CDO trap */
}
}
/* PSW.CDE = 1;*/
psw |= MASK_PSW_CDE;
/* tmp_FCX = FCX; */
tmp_FCX = env->FCX;
/* EA = {FCX.FCXS, 6'b0, FCX.FCXO, 6'b0}; */
ea = ((env->FCX & MASK_FCX_FCXS) << 12) +
((env->FCX & MASK_FCX_FCXO) << 6);
/* new_FCX = M(EA, word);
M(EA, 16 * word) = {PCXI, PSW, A[10], A[11], D[8], D[9], D[10], D[11],
A[12], A[13], A[14], A[15], D[12], D[13], D[14],
D[15]}; */
save_context_upper(env, ea, &new_FCX);
/* PCXI.PCPN = ICR.CCPN; */
env->PCXI = (env->PCXI & 0xffffff) +
((env->ICR & MASK_ICR_CCPN) << 24);
/* PCXI.PIE = ICR.IE; */
env->PCXI = ((env->PCXI & ~MASK_PCXI_PIE) +
((env->ICR & MASK_ICR_IE) << 15));
/* PCXI.UL = 1; */
env->PCXI |= MASK_PCXI_UL;
/* PCXI[19: 0] = FCX[19: 0]; */
env->PCXI = (env->PCXI & 0xfff00000) + (env->FCX & 0xfffff);
/* FCX[19: 0] = new_FCX[19: 0]; */
env->FCX = (env->FCX & 0xfff00000) + (new_FCX & 0xfffff);
/* A[11] = next_pc[31: 0]; */
env->gpr_a[11] = next_pc;
/* if (tmp_FCX == LCX) trap(FCD);*/
if (tmp_FCX == env->LCX) {
/* FCD trap */
}
psw_write(env, psw);
}
void helper_ret(CPUTriCoreState *env)
{
target_ulong ea;
target_ulong new_PCXI;
target_ulong new_PSW, psw;
psw = psw_read(env);
/* if (PSW.CDE) then if (cdc_decrement()) then trap(CDU);*/
if (env->PSW & MASK_PSW_CDE) {
if (cdc_decrement(&(env->PSW))) {
/* CDU trap */
}
}
/* if (PCXI[19: 0] == 0) then trap(CSU); */
if ((env->PCXI & 0xfffff) == 0) {
/* CSU trap */
}
/* if (PCXI.UL == 0) then trap(CTYP); */
if ((env->PCXI & MASK_PCXI_UL) == 0) {
/* CTYP trap */
}
/* PC = {A11 [31: 1], 1’b0}; */
env->PC = env->gpr_a[11] & 0xfffffffe;
/* EA = {PCXI.PCXS, 6'b0, PCXI.PCXO, 6'b0}; */
ea = ((env->PCXI & MASK_PCXI_PCXS) << 12) +
((env->PCXI & MASK_PCXI_PCXO) << 6);
/* {new_PCXI, new_PSW, A[10], A[11], D[8], D[9], D[10], D[11], A[12],
A[13], A[14], A[15], D[12], D[13], D[14], D[15]} = M(EA, 16 * word);
M(EA, word) = FCX; */
restore_context_upper(env, ea, &new_PCXI, &new_PSW);
/* FCX[19: 0] = PCXI[19: 0]; */
env->FCX = (env->FCX & 0xfff00000) + (env->PCXI & 0x000fffff);
/* PCXI = new_PCXI; */
env->PCXI = new_PCXI;
if (tricore_feature(env, TRICORE_FEATURE_13)) {
/* PSW = new_PSW */
psw_write(env, new_PSW);
} else {
/* PSW = {new_PSW[31:26], PSW[25:24], new_PSW[23:0]}; */
psw_write(env, (new_PSW & ~(0x3000000)) + (psw & (0x3000000)));
}
}
static inline void QEMU_NORETURN do_raise_exception_err(CPUTriCoreState *env,
uint32_t exception,
int error_code,
uintptr_t pc)
{
CPUState *cs = CPU(tricore_env_get_cpu(env));
cs->exception_index = exception;
env->error_code = error_code;
if (pc) {
/* now we have a real cpu fault */
cpu_restore_state(cs, pc);
}
cpu_loop_exit(cs);
}
static inline void QEMU_NORETURN do_raise_exception(CPUTriCoreState *env,
uint32_t exception,
uintptr_t pc)
{
do_raise_exception_err(env, exception, 0, pc);
}
void tlb_fill(CPUState *cs, target_ulong addr, int is_write, int mmu_idx,
uintptr_t retaddr)
{
int ret;
ret = cpu_tricore_handle_mmu_fault(cs, addr, is_write, mmu_idx);
if (ret) {
TriCoreCPU *cpu = TRICORE_CPU(cs);
CPUTriCoreState *env = &cpu->env;
do_raise_exception_err(env, cs->exception_index,
env->error_code, retaddr);
}
}
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