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target/m68k: Map FPU exceptions to FPSR register

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Add helpers for reading/writing the 68881 FPSR register so that
changes in floating point exception state can be seen by the
application.

Call these helpers in pre_load/post_load hooks to synchronize
exception state.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230803035231.429697-1-keithp@keithp.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Keith Packard 2023-08-02 20:52:31 -07:00 • committed by Richard Henderson
parent b754cb2dcd
commit 5888357942
6 changed files with 90 additions and 7 deletions
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4
target/m68k/translate.c
View file

@ -4686,7 +4686,7 @@ static void gen_load_fcr(DisasContext *s, TCGv res, int reg)
tcg_gen_movi_i32(res, 0);
break;
case M68K_FPSR:
tcg_gen_ld_i32(res, tcg_env, offsetof(CPUM68KState, fpsr));
gen_helper_get_fpsr(res, tcg_env);
break;
case M68K_FPCR:
tcg_gen_ld_i32(res, tcg_env, offsetof(CPUM68KState, fpcr));
@ -4700,7 +4700,7 @@ static void gen_store_fcr(DisasContext *s, TCGv val, int reg)
case M68K_FPIAR:
break;
case M68K_FPSR:
tcg_gen_st_i32(val, tcg_env, offsetof(CPUM68KState, fpsr));
gen_helper_set_fpsr(tcg_env, val);
break;
case M68K_FPCR:
gen_helper_set_fpcr(tcg_env, val);