| Message ID | Y1q5ye59TmjfojwZ@p100 (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] target/hppa: Fix fid instruction emulation | expand |
On 10/28/22 03:03, Helge Deller wrote: > The fid instruction (Floating-Point Identify) puts the FPU model and > revision into the Status Register. Since those values shouldn't be 0, > store values there which a PCX-L2 (for 32-bit) or a PCX-W2 (for 64-bit) > would return. Noticed while trying to install MPE/iX. > > Signed-off-by: Helge Deller <deller@gmx.de> > > --- > v2: Add ULL to integer constants, enhanced commit message. > > diff --git a/target/hppa/insns.decode b/target/hppa/insns.decode > index c7a7e997f9..3ba5f9885a 100644 > --- a/target/hppa/insns.decode > +++ b/target/hppa/insns.decode > @@ -388,10 +388,8 @@ fmpyfadd_d 101110 rm1:5 rm2:5 ... 0 1 ..0 0 0 neg:1 t:5 ra3=%rc32 > > # Floating point class 0 > > -# FID. With r = t = 0, which via fcpy puts 0 into fr0. > -# This is machine/revision = 0, which is reserved for simulator. > -fcpy_f 001100 00000 00000 00000 000000 00000 \ > - &fclass01 r=0 t=0 > +# FID. Basically like fcpy with r = t = 0. Puts machine/revision into fr0. > +fid_f 001100 00000 00000 000 00 000000 00000 Need to remove the r = t = 0 comment, because that was for (ab)using trand_fcpy_f to store zero into f0. Now you have a proper trans_fid_f function instead. Otherwise, Reviewed-by: Richard Henderson <richard.henderson@linaro.org> r~
diff --git a/target/hppa/insns.decode b/target/hppa/insns.decode index c7a7e997f9..3ba5f9885a 100644 --- a/target/hppa/insns.decode +++ b/target/hppa/insns.decode @@ -388,10 +388,8 @@ fmpyfadd_d 101110 rm1:5 rm2:5 ... 0 1 ..0 0 0 neg:1 t:5 ra3=%rc32 # Floating point class 0 -# FID. With r = t = 0, which via fcpy puts 0 into fr0. -# This is machine/revision = 0, which is reserved for simulator. -fcpy_f 001100 00000 00000 00000 000000 00000 \ - &fclass01 r=0 t=0 +# FID. Basically like fcpy with r = t = 0. Puts machine/revision into fr0. +fid_f 001100 00000 00000 000 00 000000 00000 fcpy_f 001100 ..... ..... 010 00 ...... ..... @f0c_0 fabs_f 001100 ..... ..... 011 00 ...... ..... @f0c_0 diff --git a/target/hppa/translate.c b/target/hppa/translate.c index d15b9e27c7..981f8ee03d 100644 --- a/target/hppa/translate.c +++ b/target/hppa/translate.c @@ -3622,6 +3622,17 @@ static void gen_fcpy_f(TCGv_i32 dst, TCGv_env unused, TCGv_i32 src) tcg_gen_mov_i32(dst, src); } +static bool trans_fid_f(DisasContext *ctx, arg_fid_f *a) +{ + nullify_over(ctx); +#if TARGET_REGISTER_BITS == 64 + save_frd(0, tcg_const_i64(0x13080000000000ULL)); /* PA8700 (PCX-W2) */ +#else + save_frd(0, tcg_const_i64(0x0f080000000000ULL)); /* PA7300LC (PCX-L2) */ +#endif + return nullify_end(ctx); +} + static bool trans_fcpy_f(DisasContext *ctx, arg_fclass01 *a) { return do_fop_wew(ctx, a->t, a->r, gen_fcpy_f);
The fid instruction (Floating-Point Identify) puts the FPU model and revision into the Status Register. Since those values shouldn't be 0, store values there which a PCX-L2 (for 32-bit) or a PCX-W2 (for 64-bit) would return. Noticed while trying to install MPE/iX. Signed-off-by: Helge Deller <deller@gmx.de> --- v2: Add ULL to integer constants, enhanced commit message.