diff options
author | Philippe Mathieu-Daudé <f4bug@amsat.org> | 2021-07-27 10:30:08 +0200 |
---|---|---|
committer | Philippe Mathieu-Daudé <f4bug@amsat.org> | 2021-10-17 18:35:49 +0200 |
commit | 719f874b83792951faa3fe67378eca4034bec3dc (patch) | |
tree | 7c6ab34e66e57df49407d307c5c58e4731953670 | |
parent | c148a0572130ff485cd2249fbdd1a3260d5e10a4 (diff) |
target/mips: Check nanoMIPS DSP MULT[U] accumulator with Release 6
Per the "MIPS Architecture Extension: nanoMIPS32 DSP TRM" rev 0.04,
MULT and MULTU opcodes:
The value of ac selects an accumulator numbered from 0 to 3.
When ac=0, this refers to the original HI/LO register pair of the
MIPS32 architecture.
In Release 6 of the MIPS Architecture, accumulators are eliminated
from MIPS32.
Ensure pre-Release 6 is restricted to HI/LO registers pair.
Fixes: 8b3698b2947 ("target/mips: Add emulation of DSP ASE for nanoMIPS - part 4")
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
-rw-r--r-- | target/mips/tcg/nanomips_translate.c.inc | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/target/mips/tcg/nanomips_translate.c.inc b/target/mips/tcg/nanomips_translate.c.inc index ccbcecad09..2c022a49f2 100644 --- a/target/mips/tcg/nanomips_translate.c.inc +++ b/target/mips/tcg/nanomips_translate.c.inc @@ -1868,6 +1868,9 @@ static void gen_pool32axf_2_nanomips_insn(DisasContext *ctx, uint32_t opc, TCGv_i32 t2 = tcg_temp_new_i32(); TCGv_i32 t3 = tcg_temp_new_i32(); + if (acc || ctx->insn_flags & ISA_MIPS_R6) { + check_dsp_r2(ctx); + } gen_load_gpr(t0, rs); gen_load_gpr(t1, rt); tcg_gen_trunc_tl_i32(t2, t0); @@ -1925,6 +1928,9 @@ static void gen_pool32axf_2_nanomips_insn(DisasContext *ctx, uint32_t opc, TCGv_i32 t2 = tcg_temp_new_i32(); TCGv_i32 t3 = tcg_temp_new_i32(); + if (acc || ctx->insn_flags & ISA_MIPS_R6) { + check_dsp_r2(ctx); + } gen_load_gpr(t0, rs); gen_load_gpr(t1, rt); tcg_gen_trunc_tl_i32(t2, t0); |