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target/mips: Make check_cp0_enabled() return a boolean

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To avoid callers to emit dead code if check_cp0_enabled()
raise an exception, let it return a boolean value, whether
CP0 is enabled or not.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210420193453.1913810-4-f4bug@amsat.org>
This commit is contained in:
Philippe Mathieu-Daudé 2021-04-20 20:07:38 +02:00
parent df44e81703
commit 905bdf72a6
2 changed files with 9 additions and 2 deletions
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4
target/mips/translate.c
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@ -1572,11 +1572,13 @@ void gen_move_high32(TCGv ret, TCGv_i64 arg)
#endif
}
void check_cp0_enabled(DisasContext *ctx)
bool check_cp0_enabled(DisasContext *ctx)
{
if (unlikely(!(ctx->hflags & MIPS_HFLAG_CP0))) {
generate_exception_end(ctx, EXCP_CpU);
return false;
}
return true;
}
void check_cp1_enabled(DisasContext *ctx)

7
target/mips/translate.h
View File

@ -120,7 +120,12 @@ void gen_reserved_instruction(DisasContext *ctx);
void check_insn(DisasContext *ctx, uint64_t flags);
void check_mips_64(DisasContext *ctx);
void check_cp0_enabled(DisasContext *ctx);
/**
* check_cp0_enabled:
* Return %true if CP0 is enabled, otherwise return %false
* and emit a 'coprocessor unusable' exception.
*/
bool check_cp0_enabled(DisasContext *ctx);
void check_cp1_enabled(DisasContext *ctx);
void check_cp1_64bitmode(DisasContext *ctx);
void check_cp1_registers(DisasContext *ctx, int regs);