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target/sparc: Add gen_trap_if_nofpu_fpexception

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Model fp_exception state, in which only fp stores are allowed
until such time as the FQ has been flushed.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Carl Hauser <chauser@pullman.com>
This commit is contained in:
Richard Henderson 2024-08-16 14:29:23 +10:00
parent 29b99802aa
commit d2a0c3a7f7
1 changed files with 61 additions and 29 deletions
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90
target/sparc/translate.c
View file

@ -1465,15 +1465,48 @@ static void gen_op_fpexception_im(DisasContext *dc, int ftt)
gen_exception(dc, TT_FP_EXCP); gen_exception(dc, TT_FP_EXCP);
} }
static int gen_trap_ifnofpu(DisasContext *dc) static bool gen_trap_ifnofpu(DisasContext *dc)
{ {
#if !defined(CONFIG_USER_ONLY) #if !defined(CONFIG_USER_ONLY)
if (!dc->fpu_enabled) { if (!dc->fpu_enabled) {
gen_exception(dc, TT_NFPU_INSN); gen_exception(dc, TT_NFPU_INSN);
return 1; return true;
} }
#endif #endif
return 0; return false;
}
static bool gen_trap_iffpexception(DisasContext *dc)
{
#if !defined(TARGET_SPARC64) && !defined(CONFIG_USER_ONLY)
/*
* There are 3 states for the sparc32 fpu:
* Normally the fpu is in fp_execute, and all insns are allowed.
* When an exception is signaled, it moves to fp_exception_pending state.
* Upon seeing the next FPop, the fpu moves to fp_exception state,
* populates the FQ, and generates an fp_exception trap.
* The fpu remains in fp_exception state until FQ becomes empty
* after execution of a STDFQ instruction. While the fpu is in
* fp_exception state, and FPop, fp load or fp branch insn will
* return to fp_exception_pending state, set FSR.FTT to sequence_error,
* and the insn will not be entered into the FQ.
*
* In QEMU, we do not model the fp_exception_pending state and
* instead populate FQ and raise the exception immediately.
* But we can still honor fp_exception state by noticing when
* the FQ is not empty.
*/
if (dc->fsr_qne) {
gen_op_fpexception_im(dc, FSR_FTT_SEQ_ERROR);
return true;
}
#endif
return false;
}
static bool gen_trap_if_nofpu_fpexception(DisasContext *dc)
{
return gen_trap_ifnofpu(dc) || gen_trap_iffpexception(dc);
} }
/* asi moves */ /* asi moves */
@ -2643,7 +2676,7 @@ static bool do_fbpfcc(DisasContext *dc, arg_bcc *a)
{ {
DisasCompare cmp; DisasCompare cmp;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
gen_fcompare(&cmp, a->cc, a->cond); gen_fcompare(&cmp, a->cc, a->cond);
@ -4482,7 +4515,7 @@ static bool do_ld_fpr(DisasContext *dc, arg_r_r_ri_asi *a, MemOp sz)
if (addr == NULL) { if (addr == NULL) {
return false; return false;
} }
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
if (sz == MO_128 && gen_trap_float128(dc)) { if (sz == MO_128 && gen_trap_float128(dc)) {
@ -4510,6 +4543,7 @@ static bool do_st_fpr(DisasContext *dc, arg_r_r_ri_asi *a, MemOp sz)
if (addr == NULL) { if (addr == NULL) {
return false; return false;
} }
/* Store insns are ok in fp_exception_pending state. */
if (gen_trap_ifnofpu(dc)) { if (gen_trap_ifnofpu(dc)) {
return true; return true;
} }
@ -4576,7 +4610,7 @@ static bool trans_LDFSR(DisasContext *dc, arg_r_r_ri *a)
if (addr == NULL) { if (addr == NULL) {
return false; return false;
} }
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
@ -4600,7 +4634,7 @@ static bool do_ldxfsr(DisasContext *dc, arg_r_r_ri *a, bool entire)
if (addr == NULL) { if (addr == NULL) {
return false; return false;
} }
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
@ -4637,6 +4671,7 @@ static bool do_stfsr(DisasContext *dc, arg_r_r_ri *a, MemOp mop)
if (addr == NULL) { if (addr == NULL) {
return false; return false;
} }
/* Store insns are ok in fp_exception_pending state. */
if (gen_trap_ifnofpu(dc)) { if (gen_trap_ifnofpu(dc)) {
return true; return true;
} }
@ -4679,7 +4714,7 @@ static bool do_ff(DisasContext *dc, arg_r_r *a,
{ {
TCGv_i32 tmp; TCGv_i32 tmp;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
@ -4720,7 +4755,7 @@ static bool do_env_ff(DisasContext *dc, arg_r_r *a,
{ {
TCGv_i32 tmp; TCGv_i32 tmp;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
@ -4740,7 +4775,7 @@ static bool do_env_fd(DisasContext *dc, arg_r_r *a,
TCGv_i32 dst; TCGv_i32 dst;
TCGv_i64 src; TCGv_i64 src;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
@ -4760,7 +4795,7 @@ static bool do_dd(DisasContext *dc, arg_r_r *a,
{ {
TCGv_i64 dst, src; TCGv_i64 dst, src;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
@ -4782,7 +4817,7 @@ static bool do_env_dd(DisasContext *dc, arg_r_r *a,
{ {
TCGv_i64 dst, src; TCGv_i64 dst, src;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
@ -4822,7 +4857,7 @@ static bool do_env_df(DisasContext *dc, arg_r_r *a,
TCGv_i64 dst; TCGv_i64 dst;
TCGv_i32 src; TCGv_i32 src;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
@ -4865,7 +4900,7 @@ static bool do_env_qq(DisasContext *dc, arg_r_r *a,
{ {
TCGv_i128 t; TCGv_i128 t;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
if (gen_trap_float128(dc)) { if (gen_trap_float128(dc)) {
@ -4886,7 +4921,7 @@ static bool do_env_fq(DisasContext *dc, arg_r_r *a,
TCGv_i128 src; TCGv_i128 src;
TCGv_i32 dst; TCGv_i32 dst;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
if (gen_trap_float128(dc)) { if (gen_trap_float128(dc)) {
@ -4909,7 +4944,7 @@ static bool do_env_dq(DisasContext *dc, arg_r_r *a,
TCGv_i128 src; TCGv_i128 src;
TCGv_i64 dst; TCGv_i64 dst;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
if (gen_trap_float128(dc)) { if (gen_trap_float128(dc)) {
@ -4932,7 +4967,7 @@ static bool do_env_qf(DisasContext *dc, arg_r_r *a,
TCGv_i32 src; TCGv_i32 src;
TCGv_i128 dst; TCGv_i128 dst;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
if (gen_trap_float128(dc)) { if (gen_trap_float128(dc)) {
@ -4955,10 +4990,7 @@ static bool do_env_qd(DisasContext *dc, arg_r_r *a,
TCGv_i64 src; TCGv_i64 src;
TCGv_i128 dst; TCGv_i128 dst;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true;
}
if (gen_trap_float128(dc)) {
return true; return true;
} }
@ -5015,7 +5047,7 @@ static bool do_env_fff(DisasContext *dc, arg_r_r_r *a,
{ {
TCGv_i32 src1, src2; TCGv_i32 src1, src2;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
@ -5224,7 +5256,7 @@ static bool do_env_ddd(DisasContext *dc, arg_r_r_r *a,
{ {
TCGv_i64 dst, src1, src2; TCGv_i64 dst, src1, src2;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
@ -5248,7 +5280,7 @@ static bool trans_FsMULd(DisasContext *dc, arg_r_r_r *a)
TCGv_i64 dst; TCGv_i64 dst;
TCGv_i32 src1, src2; TCGv_i32 src1, src2;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
if (!(dc->def->features & CPU_FEATURE_FSMULD)) { if (!(dc->def->features & CPU_FEATURE_FSMULD)) {
@ -5357,7 +5389,7 @@ static bool do_env_qqq(DisasContext *dc, arg_r_r_r *a,
{ {
TCGv_i128 src1, src2; TCGv_i128 src1, src2;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
if (gen_trap_float128(dc)) { if (gen_trap_float128(dc)) {
@ -5381,7 +5413,7 @@ static bool trans_FdMULq(DisasContext *dc, arg_r_r_r *a)
TCGv_i64 src1, src2; TCGv_i64 src1, src2;
TCGv_i128 dst; TCGv_i128 dst;
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
if (gen_trap_float128(dc)) { if (gen_trap_float128(dc)) {
@ -5471,7 +5503,7 @@ static bool do_fcmps(DisasContext *dc, arg_FCMPs *a, bool e)
if (avail_32(dc) && a->cc != 0) { if (avail_32(dc) && a->cc != 0) {
return false; return false;
} }
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
@ -5495,7 +5527,7 @@ static bool do_fcmpd(DisasContext *dc, arg_FCMPd *a, bool e)
if (avail_32(dc) && a->cc != 0) { if (avail_32(dc) && a->cc != 0) {
return false; return false;
} }
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
@ -5519,7 +5551,7 @@ static bool do_fcmpq(DisasContext *dc, arg_FCMPq *a, bool e)
if (avail_32(dc) && a->cc != 0) { if (avail_32(dc) && a->cc != 0) {
return false; return false;
} }
if (gen_trap_ifnofpu(dc)) { if (gen_trap_if_nofpu_fpexception(dc)) {
return true; return true;
} }
if (gen_trap_float128(dc)) { if (gen_trap_float128(dc)) {