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Sergey Fedorov 73c59faad5
tcg: Clean up direct block chaining safety checks 
We don't take care of direct jumps when address mapping changes. Thus we
must be sure to generate direct jumps so that they always keep valid
even if address mapping changes. Luckily, we can only allow to execute a
TB if it was generated from the pages which match with current mapping.

Document tcg_gen_goto_tb() declaration and note the reason for
destination PC limitations.

Some targets with variable length instructions allow TB to straddle a
page boundary. However, we make sure that both of TB pages match the
current address mapping when looking up TBs. So it is safe to do direct
jumps into the both pages. Correct the checks for some of those targets.

Given that, we can safely patch a TB which spans two pages. Remove the
unnecessary check in cpu_exec() and allow such TBs to be patched.

Backports commit 5b053a4a28278bca606eeff7d1c0730df1b047e9 from qemu
2018-02-23 22:26:00 -05:00
..
crypto crypto: Clean up includes 2018-02-19 00:47:40 -05:00
default-configs arm64eb: add support for ARM64 big endian. 2017-04-24 23:30:01 +08:00
docs docs: clarify memory region lifecycle 2018-02-12 15:11:21 -05:00
fpu fpu: silence warnings 2018-02-22 09:52:28 -05:00
hw util: move declarations out of qemu-common.h 2018-02-22 09:25:48 -05:00
include tcg: Clarify thread safety check in tb_add_jump() 2018-02-23 21:32:47 -05:00
qapi qapi: Change visit_type_FOO() to no longer return partial objects 2018-02-23 19:53:17 -05:00
qobject util: move declarations out of qemu-common.h 2018-02-22 09:25:48 -05:00
qom qapi: Use strict QMP input visitor in more places 2018-02-23 15:11:35 -05:00
scripts qapi: Change visit_type_FOO() to no longer return partial objects 2018-02-23 19:53:17 -05:00
target-arm tcg: Clean up direct block chaining safety checks 2018-02-23 22:26:00 -05:00
target-i386 tcg: Clean up direct block chaining safety checks 2018-02-23 22:26:00 -05:00
target-m68k tcg: Clean up direct block chaining safety checks 2018-02-23 22:26:00 -05:00
target-mips tb: consistently use uint32_t for tb->flags 2018-02-23 21:28:11 -05:00
target-sparc tb: consistently use uint32_t for tb->flags 2018-02-23 21:28:11 -05:00
tcg tcg: Clean up direct block chaining safety checks 2018-02-23 22:26:00 -05:00
util util: align memory allocations to 2M on AArch64 2018-02-23 13:56:59 -05:00
aarch64.h cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
aarch64eb.h cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
accel.c all: Clean up includes 2018-02-19 01:34:28 -05:00
arm.h cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
armeb.h cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
CODING_STYLE import 2015-08-21 15:04:50 +08:00
configure config.status: Pass extra parameters 2018-02-22 10:12:54 -05:00
COPYING import 2015-08-21 15:04:50 +08:00
COPYING.LIB import 2015-08-21 15:04:50 +08:00
cpu-exec-common.c exec: Clean up includes 2018-02-19 00:49:55 -05:00
cpu-exec.c tcg: Clean up direct block chaining safety checks 2018-02-23 22:26:00 -05:00
cpus.c exec: Clean up includes 2018-02-19 00:49:55 -05:00
cputlb.c cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
exec.c include/exec: Move cputlb exec.c defs out 2018-02-23 10:52:25 -05:00
gen_all_header.sh arm64eb: add support for ARM64 big endian. 2017-04-24 23:30:01 +08:00
glib_compat.c glib_compat: backport hashtable iterator interfaces 2018-02-21 13:18:44 -05:00
HACKING import 2015-08-21 15:04:50 +08:00
header_gen.py cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
ioport.c all: Clean up includes 2018-02-19 01:34:28 -05:00
LICENSE import 2015-08-21 15:04:50 +08:00
m68k.h cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
Makefile qapi: Turn generators' mandatory option -i into an argument 2018-02-19 15:22:27 -05:00
Makefile.objs crypto: move crypto objects out of libqemuutil.la 2018-02-17 15:23:50 -05:00
Makefile.target tcg: split tcg_op_defs to -common 2018-02-17 15:23:51 -05:00
memory.c include/qemu/osdep.h: Don't include qapi/error.h 2018-02-21 23:08:18 -05:00
memory_mapping.c include/qemu/osdep.h: Don't include qapi/error.h 2018-02-21 23:08:18 -05:00
mips.h cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
mips64.h cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
mips64el.h cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
mipsel.h cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
powerpc.h cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
qapi-schema.json qapi: Lazy creation of array types 2018-02-19 18:55:35 -05:00
qemu-log.c log: move qemu_log_close/qemu_log_flush from header to log.c 2018-02-22 11:13:17 -05:00
qemu-timer.c all: Clean up includes 2018-02-19 01:34:28 -05:00
rules.mak import 2015-08-21 15:04:50 +08:00
softmmu_template.h exec.c: Pass MemTxAttrs to iotlb_to_region so it uses the right AS 2018-02-17 23:19:00 -05:00
sparc.h cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
sparc64.h cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00
tcg-runtime.c all: Clean up includes 2018-02-19 01:34:28 -05:00
translate-all.c tcg: Clean up tb_jmp_unlink() 2018-02-23 21:40:07 -05:00
translate-all.h translate-all: remove unnecessary argument to tb_invalidate_phys_range 2018-02-13 09:04:51 -05:00
translate-common.c exec: Clean up includes 2018-02-19 00:49:55 -05:00
unicorn_common.h qom/cpu: Add MemoryRegion property 2018-02-18 21:54:50 -05:00
VERSION import 2015-08-21 15:04:50 +08:00
vl.c util: move declarations out of qemu-common.h 2018-02-22 09:25:48 -05:00
vl.h import 2015-08-21 15:04:50 +08:00
x86_64.h cputlb: move CPU_LOOP() for tlb_reset() to exec.c 2018-02-23 10:46:31 -05:00