diff options
| author | Emilio G. Cota <cota@braap.org> | 2017-04-26 23:29:14 -0400 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2017-06-05 09:25:42 -0700 |
| commit | cedbcb01529cb6cf9a2289cdbebbc63f6149fc18 (patch) | |
| tree | d66d40f19de1ab12a0e59131fc7b2d88f10bd823 /tcg/README | |
| parent | 374aae653499f4d405caf32b7fff0c8639113fe4 (diff) | |
tcg: Introduce goto_ptr opcode and tcg_gen_lookup_and_goto_ptr
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>
Diffstat (limited to 'tcg/README')
| -rw-r--r-- | tcg/README | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/tcg/README b/tcg/README index a9858c2f74..bf49e8242b 100644 --- a/tcg/README +++ b/tcg/README @@ -477,6 +477,14 @@ current TB was linked to this TB. Otherwise execute the next instructions. Only indices 0 and 1 are valid and tcg_gen_goto_tb may be issued at most once with each slot index per TB. +* lookup_and_goto_ptr tb_addr + +Look up a TB address ('tb_addr') and jump to it if valid. If not valid, +jump to the TCG epilogue to go back to the exec loop. + +This operation is optional. If the TCG backend does not implement the +goto_ptr opcode, emitting this op is equivalent to emitting exit_tb(0). + * qemu_ld_i32/i64 t0, t1, flags, memidx * qemu_st_i32/i64 t0, t1, flags, memidx |