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target-tricore: Add instructions of SR opcode format 

Add instructions of SR opcode format.
Add micro-op generator functions for saturate.
Add helper return from exception (rfe).

Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Message-id: 1409572800-4116-16-git-send-email-kbastian@mail.uni-paderborn.de
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Bastian Koppelmann 2014-09-01 13:00:00 +01:00 committed by Peter Maydell
parent 5a7634a28c
commit 44ea34309e
3 changed files with 164 additions and 0 deletions
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1
target-tricore/helper.h
View File

@ -22,3 +22,4 @@ DEF_HELPER_3(sub_ssov, i32, env, i32, i32)
DEF_HELPER_2(call, void, env, i32)
DEF_HELPER_1(ret, void, env)
DEF_HELPER_2(bisr, void, env, i32)
DEF_HELPER_1(rfe, void, env)

52
target-tricore/op_helper.c
View File

@ -99,6 +99,21 @@ static int cdc_decrement(target_ulong *psw)
return 0;
}
static bool cdc_zero(target_ulong *psw)
{
int cdc = *psw & MASK_PSW_CDC;
/* Returns TRUE if PSW.CDC.COUNT == 0 or if PSW.CDC ==
7'b1111111, otherwise returns FALSE. */
if (cdc == 0x7f) {
return true;
}
/* find CDC.COUNT */
int lo = clo32((*psw & MASK_PSW_CDC) << (32 - 7));
int mask = (1u << (7 - lo)) - 1;
int count = *psw & mask;
return count == 0;
}
static void save_context_upper(CPUTriCoreState *env, int ea,
target_ulong *new_FCX)
{
@ -302,6 +317,43 @@ void helper_bisr(CPUTriCoreState *env, uint32_t const9)
}
}
void helper_rfe(CPUTriCoreState *env)
{
target_ulong ea;
target_ulong new_PCXI;
target_ulong new_PSW;
/* if (PCXI[19: 0] == 0) then trap(CSU); */
if ((env->PCXI & 0xfffff) == 0) {
/* raise csu trap */
}
/* if (PCXI.UL == 0) then trap(CTYP); */
if ((env->PCXI & MASK_PCXI_UL) == 0) {
/* raise CTYP trap */
}
/* if (!cdc_zero() AND PSW.CDE) then trap(NEST); */
if (!cdc_zero(&(env->PSW)) && (env->PSW & MASK_PSW_CDE)) {
/* raise MNG trap */
}
/* ICR.IE = PCXI.PIE; */
env->ICR = (env->ICR & ~MASK_ICR_IE) + ((env->PCXI & MASK_PCXI_PIE) >> 15);
/* ICR.CCPN = PCXI.PCPN; */
env->ICR = (env->ICR & ~MASK_ICR_CCPN) +
((env->PCXI & MASK_PCXI_PCPN) >> 24);
/*EA = {PCXI.PCXS, 6'b0, PCXI.PCXO, 6'b0};*/
ea = ((env->PCXI & MASK_PCXI_PCXS) << 12) +
((env->PCXI & MASK_PCXI_PCXO) << 6);
/*{new_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]} = 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;
/* write psw */
psw_write(env, new_PSW);
}
static inline void QEMU_NORETURN do_raise_exception_err(CPUTriCoreState *env,
uint32_t exception,
int error_code,

111
target-tricore/translate.c
View File

@ -262,6 +262,29 @@ static inline void gen_mul_i32s(TCGv ret, TCGv r1, TCGv r2)
tcg_temp_free(low);
}
static void gen_saturate(TCGv ret, TCGv arg, int32_t up, int32_t low)
{
TCGv sat_neg = tcg_const_i32(low);
TCGv temp = tcg_const_i32(up);
/* sat_neg = (arg < low ) ? low : arg; */
tcg_gen_movcond_tl(TCG_COND_LT, sat_neg, arg, sat_neg, sat_neg, arg);
/* ret = (sat_neg > up ) ? up : sat_neg; */
tcg_gen_movcond_tl(TCG_COND_GT, ret, sat_neg, temp, temp, sat_neg);
tcg_temp_free(sat_neg);
tcg_temp_free(temp);
}
static void gen_saturate_u(TCGv ret, TCGv arg, int32_t up)
{
TCGv temp = tcg_const_i32(up);
/* sat_neg = (arg > up ) ? up : arg; */
tcg_gen_movcond_tl(TCG_COND_GTU, ret, arg, temp, temp, arg);
tcg_temp_free(temp);
}
static void gen_shi(TCGv ret, TCGv r1, int32_t shift_count)
{
if (shift_count == -32) {
@ -477,6 +500,15 @@ static void gen_compute_branch(DisasContext *ctx, uint32_t opc, int r1,
case OPC1_16_SBR_LOOP:
gen_loop(ctx, r1, offset * 2 - 32);
break;
/* SR-format jumps */
case OPC1_16_SR_JI:
tcg_gen_andi_tl(cpu_PC, cpu_gpr_a[r1], 0xfffffffe);
tcg_gen_exit_tb(0);
break;
case OPC2_16_SR_RET:
gen_helper_ret(cpu_env);
tcg_gen_exit_tb(0);
break;
default:
printf("Branch Error at %x\n", ctx->pc);
}
@ -794,6 +826,70 @@ static void decode_sro_opc(DisasContext *ctx, int op1)
}
}
static void decode_sr_system(CPUTriCoreState *env, DisasContext *ctx)
{
uint32_t op2;
op2 = MASK_OP_SR_OP2(ctx->opcode);
switch (op2) {
case OPC2_16_SR_NOP:
break;
case OPC2_16_SR_RET:
gen_compute_branch(ctx, op2, 0, 0, 0, 0);
break;
case OPC2_16_SR_RFE:
gen_helper_rfe(cpu_env);
tcg_gen_exit_tb(0);
ctx->bstate = BS_BRANCH;
break;
case OPC2_16_SR_DEBUG:
/* raise EXCP_DEBUG */
break;
}
}
static void decode_sr_accu(CPUTriCoreState *env, DisasContext *ctx)
{
uint32_t op2;
uint32_t r1;
TCGv temp;
r1 = MASK_OP_SR_S1D(ctx->opcode);
op2 = MASK_OP_SR_OP2(ctx->opcode);
switch (op2) {
case OPC2_16_SR_RSUB:
/* overflow only if r1 = -0x80000000 */
temp = tcg_const_i32(-0x80000000);
/* calc V bit */
tcg_gen_setcond_tl(TCG_COND_EQ, cpu_PSW_V, cpu_gpr_d[r1], temp);
tcg_gen_shli_tl(cpu_PSW_V, cpu_PSW_V, 31);
/* calc SV bit */
tcg_gen_or_tl(cpu_PSW_SV, cpu_PSW_SV, cpu_PSW_V);
/* sub */
tcg_gen_neg_tl(cpu_gpr_d[r1], cpu_gpr_d[r1]);
/* calc av */
tcg_gen_add_tl(cpu_PSW_AV, cpu_gpr_d[r1], cpu_gpr_d[r1]);
tcg_gen_xor_tl(cpu_PSW_AV, cpu_gpr_d[r1], cpu_PSW_AV);
/* calc sav */
tcg_gen_or_tl(cpu_PSW_SAV, cpu_PSW_SAV, cpu_PSW_AV);
tcg_temp_free(temp);
break;
case OPC2_16_SR_SAT_B:
gen_saturate(cpu_gpr_d[r1], cpu_gpr_d[r1], 0x7f, -0x80);
break;
case OPC2_16_SR_SAT_BU:
gen_saturate_u(cpu_gpr_d[r1], cpu_gpr_d[r1], 0xff);
break;
case OPC2_16_SR_SAT_H:
gen_saturate(cpu_gpr_d[r1], cpu_gpr_d[r1], 0x7fff, -0x8000);
break;
case OPC2_16_SR_SAT_HU:
gen_saturate_u(cpu_gpr_d[r1], cpu_gpr_d[r1], 0xffff);
break;
}
}
static void decode_16Bit_opc(CPUTriCoreState *env, DisasContext *ctx)
{
int op1;
@ -985,6 +1081,21 @@ static void decode_16Bit_opc(CPUTriCoreState *env, DisasContext *ctx)
const16 = MASK_OP_SSRO_OFF4(ctx->opcode);
gen_offset_st(ctx, cpu_gpr_d[r1], cpu_gpr_a[15], const16 * 4, MO_LESL);
break;
/* SR-format */
case OPCM_16_SR_SYSTEM:
decode_sr_system(env, ctx);
break;
case OPCM_16_SR_ACCU:
decode_sr_accu(env, ctx);
break;
case OPC1_16_SR_JI:
r1 = MASK_OP_SR_S1D(ctx->opcode);
gen_compute_branch(ctx, op1, r1, 0, 0, 0);
break;
case OPC1_16_SR_NOT:
r1 = MASK_OP_SR_S1D(ctx->opcode);
tcg_gen_not_tl(cpu_gpr_d[r1], cpu_gpr_d[r1]);
break;
}
}