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tcg: Introduce goto_ptr opcode and tcg_gen_lookup_and_goto_ptr

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Instead of exporting goto_ptr directly to TCG frontends, export
tcg_gen_lookup_and_goto_ptr(), which calls goto_ptr with the pointer
returned by the lookup_tb_ptr() helper. This is the only use case
we have for goto_ptr and lookup_tb_ptr, so having this function is
very convenient. Furthermore, it trivially allows us to avoid calling
the lookup helper if goto_ptr is not implemented by the backend.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1493263764-18657-2-git-send-email-cota@braap.org>
Message-Id: <1493263764-18657-3-git-send-email-cota@braap.org>
Message-Id: <1493263764-18657-4-git-send-email-cota@braap.org>
Message-Id: <1493263764-18657-5-git-send-email-cota@braap.org>
[rth: Squashed 4 related commits.]
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Emilio G. Cota 2017-04-26 23:29:14 -04:00 • committed by Richard Henderson
parent 374aae6534
commit cedbcb0152
19 changed files with 85 additions and 4 deletions
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11
tcg/tcg-op.h
View file

@ -796,6 +796,17 @@ static inline void tcg_gen_exit_tb(uintptr_t val)
*/
void tcg_gen_goto_tb(unsigned idx);
/**
* tcg_gen_lookup_and_goto_ptr() - look up a TB and jump to it if valid
* @addr: Guest address of the target TB
*
* If the TB is not valid, jump to the epilogue.
*
* This operation is optional. If the TCG backend does not implement goto_ptr,
* this op is equivalent to calling tcg_gen_exit_tb() with 0 as the argument.
*/
void tcg_gen_lookup_and_goto_ptr(TCGv addr);
#if TARGET_LONG_BITS == 32
#define tcg_temp_new() tcg_temp_new_i32()
#define tcg_global_reg_new tcg_global_reg_new_i32