mirror of https://github.com/xemu-project/xemu.git
709bcd7da3
The old implementation replaces two insns, swapping between
b <dest>
nop
and
pcaddu18i tmp, <dest>
jirl zero, tmp, <dest> & 0xffff
There is a race condition in which a thread could be stopped at
the jirl, i.e. with the top of the address loaded, and when
restarted we have re-linked to a different TB, so that the top
half no longer matches the bottom half.
Note that while we never directly re-link to a different TB, we
can link, unlink, and link again all while the stopped thread
remains stopped.
The new implementation replaces only one insn, swapping between
b <dest>
and
pcadd tmp, <jmp_addr>
falling through to load the address from tmp, and branch.
Reviewed-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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| .. | ||
| aarch64 | ||
| arm | ||
| i386 | ||
| loongarch64 | ||
| mips | ||
| ppc | ||
| riscv | ||
| s390x | ||
| sparc64 | ||
| tci | ||
| meson.build | ||
| optimize.c | ||
| region.c | ||
| tcg-common.c | ||
| tcg-internal.h | ||
| tcg-ldst.c.inc | ||
| tcg-op-gvec.c | ||
| tcg-op-vec.c | ||
| tcg-op.c | ||
| tcg-pool.c.inc | ||
| tcg.c | ||
| tci.c | ||