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Diffstat (limited to 'target-alpha/translate.c')
-rw-r--r--target-alpha/translate.c521
1 files changed, 433 insertions, 88 deletions
diff --git a/target-alpha/translate.c b/target-alpha/translate.c
index 515c8c7..a11e5ed 100644
--- a/target-alpha/translate.c
+++ b/target-alpha/translate.c
@@ -33,6 +33,7 @@
#include "helper.h"
#undef ALPHA_DEBUG_DISAS
+#define CONFIG_SOFTFLOAT_INLINE
#ifdef ALPHA_DEBUG_DISAS
# define LOG_DISAS(...) qemu_log_mask(CPU_LOG_TB_IN_ASM, ## __VA_ARGS__)
@@ -49,6 +50,11 @@ struct DisasContext {
#endif
CPUAlphaState *env;
uint32_t amask;
+
+ /* Current rounding mode for this TB. */
+ int tb_rm;
+ /* Current flush-to-zero setting for this TB. */
+ int tb_ftz;
};
/* global register indexes */
@@ -442,62 +448,333 @@ static void gen_fcmov(TCGCond inv_cond, int ra, int rb, int rc)
gen_set_label(l1);
}
-#define FARITH2(name) \
-static inline void glue(gen_f, name)(int rb, int rc) \
-{ \
- if (unlikely(rc == 31)) \
- return; \
- \
- if (rb != 31) \
- gen_helper_ ## name (cpu_fir[rc], cpu_fir[rb]); \
- else { \
- TCGv tmp = tcg_const_i64(0); \
- gen_helper_ ## name (cpu_fir[rc], tmp); \
- tcg_temp_free(tmp); \
- } \
+#define QUAL_RM_N 0x080 /* Round mode nearest even */
+#define QUAL_RM_C 0x000 /* Round mode chopped */
+#define QUAL_RM_M 0x040 /* Round mode minus infinity */
+#define QUAL_RM_D 0x0c0 /* Round mode dynamic */
+#define QUAL_RM_MASK 0x0c0
+
+#define QUAL_U 0x100 /* Underflow enable (fp output) */
+#define QUAL_V 0x100 /* Overflow enable (int output) */
+#define QUAL_S 0x400 /* Software completion enable */
+#define QUAL_I 0x200 /* Inexact detection enable */
+
+static void gen_qual_roundmode(DisasContext *ctx, int fn11)
+{
+ TCGv_i32 tmp;
+
+ fn11 &= QUAL_RM_MASK;
+ if (fn11 == ctx->tb_rm) {
+ return;
+ }
+ ctx->tb_rm = fn11;
+
+ tmp = tcg_temp_new_i32();
+ switch (fn11) {
+ case QUAL_RM_N:
+ tcg_gen_movi_i32(tmp, float_round_nearest_even);
+ break;
+ case QUAL_RM_C:
+ tcg_gen_movi_i32(tmp, float_round_to_zero);
+ break;
+ case QUAL_RM_M:
+ tcg_gen_movi_i32(tmp, float_round_down);
+ break;
+ case QUAL_RM_D:
+ tcg_gen_ld8u_i32(tmp, cpu_env, offsetof(CPUState, fpcr_dyn_round));
+ break;
+ }
+
+#if defined(CONFIG_SOFTFLOAT_INLINE)
+ /* ??? The "softfloat.h" interface is to call set_float_rounding_mode.
+ With CONFIG_SOFTFLOAT that expands to an out-of-line call that just
+ sets the one field. */
+ tcg_gen_st8_i32(tmp, cpu_env,
+ offsetof(CPUState, fp_status.float_rounding_mode));
+#else
+ gen_helper_setroundmode(tmp);
+#endif
+
+ tcg_temp_free_i32(tmp);
+}
+
+static void gen_qual_flushzero(DisasContext *ctx, int fn11)
+{
+ TCGv_i32 tmp;
+
+ fn11 &= QUAL_U;
+ if (fn11 == ctx->tb_ftz) {
+ return;
+ }
+ ctx->tb_ftz = fn11;
+
+ tmp = tcg_temp_new_i32();
+ if (fn11) {
+ /* Underflow is enabled, use the FPCR setting. */
+ tcg_gen_ld8u_i32(tmp, cpu_env, offsetof(CPUState, fpcr_flush_to_zero));
+ } else {
+ /* Underflow is disabled, force flush-to-zero. */
+ tcg_gen_movi_i32(tmp, 1);
+ }
+
+#if defined(CONFIG_SOFTFLOAT_INLINE)
+ tcg_gen_st8_i32(tmp, cpu_env,
+ offsetof(CPUState, fp_status.flush_to_zero));
+#else
+ gen_helper_setflushzero(tmp);
+#endif
+
+ tcg_temp_free_i32(tmp);
+}
+
+static TCGv gen_ieee_input(int reg, int fn11, int is_cmp)
+{
+ TCGv val = tcg_temp_new();
+ if (reg == 31) {
+ tcg_gen_movi_i64(val, 0);
+ } else if (fn11 & QUAL_S) {
+ gen_helper_ieee_input_s(val, cpu_fir[reg]);
+ } else if (is_cmp) {
+ gen_helper_ieee_input_cmp(val, cpu_fir[reg]);
+ } else {
+ gen_helper_ieee_input(val, cpu_fir[reg]);
+ }
+ return val;
+}
+
+static void gen_fp_exc_clear(void)
+{
+#if defined(CONFIG_SOFTFLOAT_INLINE)
+ TCGv_i32 zero = tcg_const_i32(0);
+ tcg_gen_st8_i32(zero, cpu_env,
+ offsetof(CPUState, fp_status.float_exception_flags));
+ tcg_temp_free_i32(zero);
+#else
+ gen_helper_fp_exc_clear();
+#endif
+}
+
+static void gen_fp_exc_raise_ignore(int rc, int fn11, int ignore)
+{
+ /* ??? We ought to be able to do something with imprecise exceptions.
+ E.g. notice we're still in the trap shadow of something within the
+ TB and do not generate the code to signal the exception; end the TB
+ when an exception is forced to arrive, either by consumption of a
+ register value or TRAPB or EXCB. */
+ TCGv_i32 exc = tcg_temp_new_i32();
+ TCGv_i32 reg;
+
+#if defined(CONFIG_SOFTFLOAT_INLINE)
+ tcg_gen_ld8u_i32(exc, cpu_env,
+ offsetof(CPUState, fp_status.float_exception_flags));
+#else
+ gen_helper_fp_exc_get(exc);
+#endif
+
+ if (ignore) {
+ tcg_gen_andi_i32(exc, exc, ~ignore);
+ }
+
+ /* ??? Pass in the regno of the destination so that the helper can
+ set EXC_MASK, which contains a bitmask of destination registers
+ that have caused arithmetic traps. A simple userspace emulation
+ does not require this. We do need it for a guest kernel's entArith,
+ or if we were to do something clever with imprecise exceptions. */
+ reg = tcg_const_i32(rc + 32);
+
+ if (fn11 & QUAL_S) {
+ gen_helper_fp_exc_raise_s(exc, reg);
+ } else {
+ gen_helper_fp_exc_raise(exc, reg);
+ }
+
+ tcg_temp_free_i32(reg);
+ tcg_temp_free_i32(exc);
+}
+
+static inline void gen_fp_exc_raise(int rc, int fn11)
+{
+ gen_fp_exc_raise_ignore(rc, fn11, fn11 & QUAL_I ? 0 : float_flag_inexact);
}
-FARITH2(sqrts)
+
+#define FARITH2(name) \
+static inline void glue(gen_f, name)(int rb, int rc) \
+{ \
+ if (unlikely(rc == 31)) { \
+ return; \
+ } \
+ if (rb != 31) { \
+ gen_helper_ ## name (cpu_fir[rc], cpu_fir[rb]); \
+ } else { \
+ TCGv tmp = tcg_const_i64(0); \
+ gen_helper_ ## name (cpu_fir[rc], tmp); \
+ tcg_temp_free(tmp); \
+ } \
+}
+FARITH2(cvtlq)
+FARITH2(cvtql)
+FARITH2(cvtql_v)
+FARITH2(cvtql_sv)
+
+/* ??? VAX instruction qualifiers ignored. */
FARITH2(sqrtf)
FARITH2(sqrtg)
-FARITH2(sqrtt)
FARITH2(cvtgf)
FARITH2(cvtgq)
FARITH2(cvtqf)
FARITH2(cvtqg)
-FARITH2(cvtst)
-FARITH2(cvtts)
-FARITH2(cvttq)
-FARITH2(cvtqs)
-FARITH2(cvtqt)
-FARITH2(cvtlq)
-FARITH2(cvtql)
-FARITH2(cvtqlv)
-FARITH2(cvtqlsv)
-
-#define FARITH3(name) \
-static inline void glue(gen_f, name)(int ra, int rb, int rc) \
-{ \
- if (unlikely(rc == 31)) \
- return; \
- \
- if (ra != 31) { \
- if (rb != 31) \
- gen_helper_ ## name (cpu_fir[rc], cpu_fir[ra], cpu_fir[rb]); \
- else { \
- TCGv tmp = tcg_const_i64(0); \
- gen_helper_ ## name (cpu_fir[rc], cpu_fir[ra], tmp); \
- tcg_temp_free(tmp); \
- } \
- } else { \
- TCGv tmp = tcg_const_i64(0); \
- if (rb != 31) \
- gen_helper_ ## name (cpu_fir[rc], tmp, cpu_fir[rb]); \
- else \
- gen_helper_ ## name (cpu_fir[rc], tmp, tmp); \
- tcg_temp_free(tmp); \
- } \
+
+static void gen_ieee_arith2(DisasContext *ctx, void (*helper)(TCGv, TCGv),
+ int rb, int rc, int fn11)
+{
+ TCGv vb;
+
+ /* ??? This is wrong: the instruction is not a nop, it still may
+ raise exceptions. */
+ if (unlikely(rc == 31)) {
+ return;
+ }
+
+ gen_qual_roundmode(ctx, fn11);
+ gen_qual_flushzero(ctx, fn11);
+ gen_fp_exc_clear();
+
+ vb = gen_ieee_input(rb, fn11, 0);
+ helper(cpu_fir[rc], vb);
+ tcg_temp_free(vb);
+
+ gen_fp_exc_raise(rc, fn11);
+}
+
+#define IEEE_ARITH2(name) \
+static inline void glue(gen_f, name)(DisasContext *ctx, \
+ int rb, int rc, int fn11) \
+{ \
+ gen_ieee_arith2(ctx, gen_helper_##name, rb, rc, fn11); \
+}
+IEEE_ARITH2(sqrts)
+IEEE_ARITH2(sqrtt)
+IEEE_ARITH2(cvtst)
+IEEE_ARITH2(cvtts)
+
+static void gen_fcvttq(DisasContext *ctx, int rb, int rc, int fn11)
+{
+ TCGv vb;
+ int ignore = 0;
+
+ /* ??? This is wrong: the instruction is not a nop, it still may
+ raise exceptions. */
+ if (unlikely(rc == 31)) {
+ return;
+ }
+
+ /* No need to set flushzero, since we have an integer output. */
+ gen_fp_exc_clear();
+ vb = gen_ieee_input(rb, fn11, 0);
+
+ /* Almost all integer conversions use cropped rounding, and most
+ also do not have integer overflow enabled. Special case that. */
+ switch (fn11) {
+ case QUAL_RM_C:
+ gen_helper_cvttq_c(cpu_fir[rc], vb);
+ break;
+ case QUAL_V | QUAL_RM_C:
+ case QUAL_S | QUAL_V | QUAL_RM_C:
+ ignore = float_flag_inexact;
+ /* FALLTHRU */
+ case QUAL_S | QUAL_V | QUAL_I | QUAL_RM_C:
+ gen_helper_cvttq_svic(cpu_fir[rc], vb);
+ break;
+ default:
+ gen_qual_roundmode(ctx, fn11);
+ gen_helper_cvttq(cpu_fir[rc], vb);
+ ignore |= (fn11 & QUAL_V ? 0 : float_flag_overflow);
+ ignore |= (fn11 & QUAL_I ? 0 : float_flag_inexact);
+ break;
+ }
+ tcg_temp_free(vb);
+
+ gen_fp_exc_raise_ignore(rc, fn11, ignore);
}
+static void gen_ieee_intcvt(DisasContext *ctx, void (*helper)(TCGv, TCGv),
+ int rb, int rc, int fn11)
+{
+ TCGv vb;
+
+ /* ??? This is wrong: the instruction is not a nop, it still may
+ raise exceptions. */
+ if (unlikely(rc == 31)) {
+ return;
+ }
+
+ gen_qual_roundmode(ctx, fn11);
+
+ if (rb == 31) {
+ vb = tcg_const_i64(0);
+ } else {
+ vb = cpu_fir[rb];
+ }
+
+ /* The only exception that can be raised by integer conversion
+ is inexact. Thus we only need to worry about exceptions when
+ inexact handling is requested. */
+ if (fn11 & QUAL_I) {
+ gen_fp_exc_clear();
+ helper(cpu_fir[rc], vb);
+ gen_fp_exc_raise(rc, fn11);
+ } else {
+ helper(cpu_fir[rc], vb);
+ }
+
+ if (rb == 31) {
+ tcg_temp_free(vb);
+ }
+}
+
+#define IEEE_INTCVT(name) \
+static inline void glue(gen_f, name)(DisasContext *ctx, \
+ int rb, int rc, int fn11) \
+{ \
+ gen_ieee_intcvt(ctx, gen_helper_##name, rb, rc, fn11); \
+}
+IEEE_INTCVT(cvtqs)
+IEEE_INTCVT(cvtqt)
+
+#define FARITH3(name) \
+static inline void glue(gen_f, name)(int ra, int rb, int rc) \
+{ \
+ TCGv va, vb; \
+ \
+ if (unlikely(rc == 31)) { \
+ return; \
+ } \
+ if (ra == 31) { \
+ va = tcg_const_i64(0); \
+ } else { \
+ va = cpu_fir[ra]; \
+ } \
+ if (rb == 31) { \
+ vb = tcg_const_i64(0); \
+ } else { \
+ vb = cpu_fir[rb]; \
+ } \
+ \
+ gen_helper_ ## name (cpu_fir[rc], va, vb); \
+ \
+ if (ra == 31) { \
+ tcg_temp_free(va); \
+ } \
+ if (rb == 31) { \
+ tcg_temp_free(vb); \
+ } \
+}
+/* ??? Ought to expand these inline; simple masking operations. */
+FARITH3(cpys)
+FARITH3(cpysn)
+FARITH3(cpyse)
+
+/* ??? VAX instruction qualifiers ignored. */
FARITH3(addf)
FARITH3(subf)
FARITH3(mulf)
@@ -509,21 +786,80 @@ FARITH3(divg)
FARITH3(cmpgeq)
FARITH3(cmpglt)
FARITH3(cmpgle)
-FARITH3(adds)
-FARITH3(subs)
-FARITH3(muls)
-FARITH3(divs)
-FARITH3(addt)
-FARITH3(subt)
-FARITH3(mult)
-FARITH3(divt)
-FARITH3(cmptun)
-FARITH3(cmpteq)
-FARITH3(cmptlt)
-FARITH3(cmptle)
-FARITH3(cpys)
-FARITH3(cpysn)
-FARITH3(cpyse)
+
+static void gen_ieee_arith3(DisasContext *ctx,
+ void (*helper)(TCGv, TCGv, TCGv),
+ int ra, int rb, int rc, int fn11)
+{
+ TCGv va, vb;
+
+ /* ??? This is wrong: the instruction is not a nop, it still may
+ raise exceptions. */
+ if (unlikely(rc == 31)) {
+ return;
+ }
+
+ gen_qual_roundmode(ctx, fn11);
+ gen_qual_flushzero(ctx, fn11);
+ gen_fp_exc_clear();
+
+ va = gen_ieee_input(ra, fn11, 0);
+ vb = gen_ieee_input(rb, fn11, 0);
+ helper(cpu_fir[rc], va, vb);
+ tcg_temp_free(va);
+ tcg_temp_free(vb);
+
+ gen_fp_exc_raise(rc, fn11);
+}
+
+#define IEEE_ARITH3(name) \
+static inline void glue(gen_f, name)(DisasContext *ctx, \
+ int ra, int rb, int rc, int fn11) \
+{ \
+ gen_ieee_arith3(ctx, gen_helper_##name, ra, rb, rc, fn11); \
+}
+IEEE_ARITH3(adds)
+IEEE_ARITH3(subs)
+IEEE_ARITH3(muls)
+IEEE_ARITH3(divs)
+IEEE_ARITH3(addt)
+IEEE_ARITH3(subt)
+IEEE_ARITH3(mult)
+IEEE_ARITH3(divt)
+
+static void gen_ieee_compare(DisasContext *ctx,
+ void (*helper)(TCGv, TCGv, TCGv),
+ int ra, int rb, int rc, int fn11)
+{
+ TCGv va, vb;
+
+ /* ??? This is wrong: the instruction is not a nop, it still may
+ raise exceptions. */
+ if (unlikely(rc == 31)) {
+ return;
+ }
+
+ gen_fp_exc_clear();
+
+ va = gen_ieee_input(ra, fn11, 1);
+ vb = gen_ieee_input(rb, fn11, 1);
+ helper(cpu_fir[rc], va, vb);
+ tcg_temp_free(va);
+ tcg_temp_free(vb);
+
+ gen_fp_exc_raise(rc, fn11);
+}
+
+#define IEEE_CMP3(name) \
+static inline void glue(gen_f, name)(DisasContext *ctx, \
+ int ra, int rb, int rc, int fn11) \
+{ \
+ gen_ieee_compare(ctx, gen_helper_##name, ra, rb, rc, fn11); \
+}
+IEEE_CMP3(cmptun)
+IEEE_CMP3(cmpteq)
+IEEE_CMP3(cmptlt)
+IEEE_CMP3(cmptle)
static inline uint64_t zapnot_mask(uint8_t lit)
{
@@ -1607,7 +1943,7 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
}
break;
case 0x14:
- switch (fpfn) { /* f11 & 0x3F */
+ switch (fpfn) { /* fn11 & 0x3F */
case 0x04:
/* ITOFS */
if (!(ctx->amask & AMASK_FIX))
@@ -1632,7 +1968,7 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
/* SQRTS */
if (!(ctx->amask & AMASK_FIX))
goto invalid_opc;
- gen_fsqrts(rb, rc);
+ gen_fsqrts(ctx, rb, rc, fn11);
break;
case 0x14:
/* ITOFF */
@@ -1669,7 +2005,7 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
/* SQRTT */
if (!(ctx->amask & AMASK_FIX))
goto invalid_opc;
- gen_fsqrtt(rb, rc);
+ gen_fsqrtt(ctx, rb, rc, fn11);
break;
default:
goto invalid_opc;
@@ -1678,7 +2014,7 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
case 0x15:
/* VAX floating point */
/* XXX: rounding mode and trap are ignored (!) */
- switch (fpfn) { /* f11 & 0x3F */
+ switch (fpfn) { /* fn11 & 0x3F */
case 0x00:
/* ADDF */
gen_faddf(ra, rb, rc);
@@ -1761,77 +2097,75 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
break;
case 0x16:
/* IEEE floating-point */
- /* XXX: rounding mode and traps are ignored (!) */
- switch (fpfn) { /* f11 & 0x3F */
+ switch (fpfn) { /* fn11 & 0x3F */
case 0x00:
/* ADDS */
- gen_fadds(ra, rb, rc);
+ gen_fadds(ctx, ra, rb, rc, fn11);
break;
case 0x01:
/* SUBS */
- gen_fsubs(ra, rb, rc);
+ gen_fsubs(ctx, ra, rb, rc, fn11);
break;
case 0x02:
/* MULS */
- gen_fmuls(ra, rb, rc);
+ gen_fmuls(ctx, ra, rb, rc, fn11);
break;
case 0x03:
/* DIVS */
- gen_fdivs(ra, rb, rc);
+ gen_fdivs(ctx, ra, rb, rc, fn11);
break;
case 0x20:
/* ADDT */
- gen_faddt(ra, rb, rc);
+ gen_faddt(ctx, ra, rb, rc, fn11);
break;
case 0x21:
/* SUBT */
- gen_fsubt(ra, rb, rc);
+ gen_fsubt(ctx, ra, rb, rc, fn11);
break;
case 0x22:
/* MULT */
- gen_fmult(ra, rb, rc);
+ gen_fmult(ctx, ra, rb, rc, fn11);
break;
case 0x23:
/* DIVT */
- gen_fdivt(ra, rb, rc);
+ gen_fdivt(ctx, ra, rb, rc, fn11);
break;
case 0x24:
/* CMPTUN */
- gen_fcmptun(ra, rb, rc);
+ gen_fcmptun(ctx, ra, rb, rc, fn11);
break;
case 0x25:
/* CMPTEQ */
- gen_fcmpteq(ra, rb, rc);
+ gen_fcmpteq(ctx, ra, rb, rc, fn11);
break;
case 0x26:
/* CMPTLT */
- gen_fcmptlt(ra, rb, rc);
+ gen_fcmptlt(ctx, ra, rb, rc, fn11);
break;
case 0x27:
/* CMPTLE */
- gen_fcmptle(ra, rb, rc);
+ gen_fcmptle(ctx, ra, rb, rc, fn11);
break;
case 0x2C:
- /* XXX: incorrect */
if (fn11 == 0x2AC || fn11 == 0x6AC) {
/* CVTST */
- gen_fcvtst(rb, rc);
+ gen_fcvtst(ctx, rb, rc, fn11);
} else {
/* CVTTS */
- gen_fcvtts(rb, rc);
+ gen_fcvtts(ctx, rb, rc, fn11);
}
break;
case 0x2F:
/* CVTTQ */
- gen_fcvttq(rb, rc);
+ gen_fcvttq(ctx, rb, rc, fn11);
break;
case 0x3C:
/* CVTQS */
- gen_fcvtqs(rb, rc);
+ gen_fcvtqs(ctx, rb, rc, fn11);
break;
case 0x3E:
/* CVTQT */
- gen_fcvtqt(rb, rc);
+ gen_fcvtqt(ctx, rb, rc, fn11);
break;
default:
goto invalid_opc;
@@ -1910,11 +2244,11 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
break;
case 0x130:
/* CVTQL/V */
- gen_fcvtqlv(rb, rc);
+ gen_fcvtql_v(rb, rc);
break;
case 0x530:
/* CVTQL/SV */
- gen_fcvtqlsv(rb, rc);
+ gen_fcvtql_sv(rb, rc);
break;
default:
goto invalid_opc;
@@ -2597,6 +2931,17 @@ static inline void gen_intermediate_code_internal(CPUState *env,
ctx.mem_idx = ((env->ps >> 3) & 3);
ctx.pal_mode = env->ipr[IPR_EXC_ADDR] & 1;
#endif
+
+ /* ??? Every TB begins with unset rounding mode, to be initialized on
+ the first fp insn of the TB. Alternately we could define a proper
+ default for every TB (e.g. QUAL_RM_N or QUAL_RM_D) and make sure
+ to reset the FP_STATUS to that default at the end of any TB that
+ changes the default. We could even (gasp) dynamiclly figure out
+ what default would be most efficient given the running program. */
+ ctx.tb_rm = -1;
+ /* Similarly for flush-to-zero. */
+ ctx.tb_ftz = -1;
+
num_insns = 0;
max_insns = tb->cflags & CF_COUNT_MASK;
if (max_insns == 0)
generated by cgit v1.1 at 2024-07-13 20:33:31 +0000