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| author | Richard Henderson | 2017-07-18 22:02:31 +0200 |
|---|---|---|
| committer | Aurelien Jarno | 2017-07-18 23:39:16 +0200 |
| commit | 4bfa602bc2227f5b5a506a4c0c20657d68eaefd1 (patch) | |
| tree | 4c74bbd8d12c615eb75beaf01938dc63ea01f1b3 /target/sh4/helper.h | |
| parent | target/sh4: Adjust TB_FLAG_PENDING_MOVCA (diff) | |
| download | qemu-4bfa602bc2227f5b5a506a4c0c20657d68eaefd1.tar.gz qemu-4bfa602bc2227f5b5a506a4c0c20657d68eaefd1.tar.xz qemu-4bfa602bc2227f5b5a506a4c0c20657d68eaefd1.zip | |
target/sh4: Handle user-space atomics
For uniprocessors, SH4 uses optimistic restartable atomic sequences.
Upon an interrupt, a real kernel would simply notice magic values in
the registers and reset the PC to the start of the sequence.
For QEMU, we cannot do this in quite the same way. Instead, we notice
the normal start of such a sequence (mov #-x,r15), and start a new TB
that can be executed under cpu_exec_step_atomic.
Reported-by: Bruno Haible <bruno@clisp.org>
LP: https://bugs.launchpad.net/bugs/1701971
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <20170718200255.31647-7-rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'target/sh4/helper.h')
| -rw-r--r-- | target/sh4/helper.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/target/sh4/helper.h b/target/sh4/helper.h index 767a6d5209..6c6fa04732 100644 --- a/target/sh4/helper.h +++ b/target/sh4/helper.h @@ -6,6 +6,7 @@ DEF_HELPER_1(raise_slot_fpu_disable, noreturn, env) DEF_HELPER_1(debug, noreturn, env) DEF_HELPER_1(sleep, noreturn, env) DEF_HELPER_2(trapa, noreturn, env, i32) +DEF_HELPER_1(exclusive, noreturn, env) DEF_HELPER_3(movcal, void, env, i32, i32) DEF_HELPER_1(discard_movcal_backup, void, env) |