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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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3
target/m68k/cpu.h
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@ -199,7 +199,8 @@ void cpu_m68k_set_ccr(CPUM68KState *env, uint32_t);
void cpu_m68k_set_sr(CPUM68KState *env, uint32_t);
void cpu_m68k_restore_fp_status(CPUM68KState *env);
void cpu_m68k_set_fpcr(CPUM68KState *env, uint32_t val);
uint32_t cpu_m68k_get_fpsr(CPUM68KState *env);
void cpu_m68k_set_fpsr(CPUM68KState *env, uint32_t val);
/*
* Instead of computing the condition codes after each m68k instruction,