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unicorn/qemu/accel/tcg/cpu-exec-common.c

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cpu-exec: Migrate some generic fns to cpu-exec-common The goal is to split the functions such that cpu-exec is CPU specific content, while cpus-exec-common.c is generic code only. The function interface to cpu-exec needs to be virtualised to prepare support for multi-arch and moving these definitions out saves bloating the QOM interface. So move these definitions out of cpu-exec to a new module, cpu-exec-common. Backports commit 5abf9495ca9ff41160260ac274115825c10545cc from qemu
2018-02-15 19:50:06 +00:00
/*
* emulator main execution loop
*
* Copyright (c) 2003-2005 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
exec: Clean up includes Clean up includes so that osdep.h is included first and headers which it implies are not included manually. This commit was created with scripts/clean-includes. Backports commit 7b31bbc2e68605ab2f10dc609dd54cf4c7b5f49a from qemu
2018-02-19 05:49:52 +00:00
#include "qemu/osdep.h"
cpu-exec: Migrate some generic fns to cpu-exec-common The goal is to split the functions such that cpu-exec is CPU specific content, while cpus-exec-common.c is generic code only. The function interface to cpu-exec needs to be virtualised to prepare support for multi-arch and moving these definitions out saves bloating the QOM interface. So move these definitions out of cpu-exec to a new module, cpu-exec-common. Backports commit 5abf9495ca9ff41160260ac274115825c10545cc from qemu
2018-02-15 19:50:06 +00:00
#include "cpu.h"
#include "sysemu/cpus.h"
cpu: move exec-all.h inclusion out of cpu.h exec-all.h contains TCG-specific definitions. It is not needed outside TCG-specific files such as translate.c, exec.c or *helper.c. One generic function had snuck into include/exec/exec-all.h; move it to include/qom/cpu.h. Backports commit 63c915526d6a54a95919ebece83fa9ca631b2508 from qemu
2018-02-24 07:26:26 +00:00
#include "exec/exec-all.h"
cpu-exec: Migrate some generic fns to cpu-exec-common The goal is to split the functions such that cpu-exec is CPU specific content, while cpus-exec-common.c is generic code only. The function interface to cpu-exec needs to be virtualised to prepare support for multi-arch and moving these definitions out saves bloating the QOM interface. So move these definitions out of cpu-exec to a new module, cpu-exec-common. Backports commit 5abf9495ca9ff41160260ac274115825c10545cc from qemu
2018-02-15 19:50:06 +00:00
#include "exec/memory-internal.h"
cpu-exec: Rename cpu_resume_from_signal() to cpu_loop_exit_noexc() The function cpu_resume_from_signal() is now always called with a NULL puc argument, and is rather misnamed since it is never called from a signal handler. It is essentially forcing an exit to the top level cpu loop but without raising any exception, so rename it to cpu_loop_exit_noexc() and drop the useless unused argument. Backports commit 6886b98036a8f8f5bce8b10756ce080084cef11b from qemu
2018-02-24 22:24:41 +00:00
/* exit the current TB, but without causing any exception to be raised */
void cpu_loop_exit_noexc(CPUState *cpu)
cpu-exec: Migrate some generic fns to cpu-exec-common The goal is to split the functions such that cpu-exec is CPU specific content, while cpus-exec-common.c is generic code only. The function interface to cpu-exec needs to be virtualised to prepare support for multi-arch and moving these definitions out saves bloating the QOM interface. So move these definitions out of cpu-exec to a new module, cpu-exec-common. Backports commit 5abf9495ca9ff41160260ac274115825c10545cc from qemu
2018-02-15 19:50:06 +00:00
{
cpu->exception_index = -1;
icount: fix cpu_restore_state_from_tb for non-tb-exit cases In icount mode, instructions that access io memory spaces in the middle of the translation block invoke TB recompilation. After recompilation, such instructions become last in the TB and are allowed to access io memory spaces. When the code includes instruction like i386 'xchg eax, 0xffffd080' which accesses APIC, QEMU goes into an infinite loop of the recompilation. This instruction includes two memory accesses - one read and one write. After the first access, APIC calls cpu_report_tpr_access, which restores the CPU state to get the current eip. But cpu_restore_state_from_tb resets the cpu->can_do_io flag which makes the second memory access invalid. Therefore the second memory access causes a recompilation of the block. Then these operations repeat again and again. This patch moves resetting cpu->can_do_io flag from cpu_restore_state_from_tb to cpu_loop_exit* functions. It also adds a parameter for cpu_restore_state which controls restoring icount. There is no need to restore icount when we only query CPU state without breaking the TB. Restoring it in such cases leads to the incorrect flow of the virtual time. In most cases new parameter is true (icount should be recalculated). But there are two cases in i386 and openrisc when the CPU state is only queried without the need to break the TB. This patch fixes both of these cases. Backports commit afd46fcad2dceffda35c0586f5723c127b6e09d8 from qemu
2018-04-11 23:57:23 +00:00
cpu_loop_exit(cpu);
cpu-exec: Migrate some generic fns to cpu-exec-common The goal is to split the functions such that cpu-exec is CPU specific content, while cpus-exec-common.c is generic code only. The function interface to cpu-exec needs to be virtualised to prepare support for multi-arch and moving these definitions out saves bloating the QOM interface. So move these definitions out of cpu-exec to a new module, cpu-exec-common. Backports commit 5abf9495ca9ff41160260ac274115825c10545cc from qemu
2018-02-15 19:50:06 +00:00
}
void cpu_loop_exit(CPUState *cpu)
{
icount: fix cpu_restore_state_from_tb for non-tb-exit cases In icount mode, instructions that access io memory spaces in the middle of the translation block invoke TB recompilation. After recompilation, such instructions become last in the TB and are allowed to access io memory spaces. When the code includes instruction like i386 'xchg eax, 0xffffd080' which accesses APIC, QEMU goes into an infinite loop of the recompilation. This instruction includes two memory accesses - one read and one write. After the first access, APIC calls cpu_report_tpr_access, which restores the CPU state to get the current eip. But cpu_restore_state_from_tb resets the cpu->can_do_io flag which makes the second memory access invalid. Therefore the second memory access causes a recompilation of the block. Then these operations repeat again and again. This patch moves resetting cpu->can_do_io flag from cpu_restore_state_from_tb to cpu_loop_exit* functions. It also adds a parameter for cpu_restore_state which controls restoring icount. There is no need to restore icount when we only query CPU state without breaking the TB. Restoring it in such cases leads to the incorrect flow of the virtual time. In most cases new parameter is true (icount should be recalculated). But there are two cases in i386 and openrisc when the CPU state is only queried without the need to break the TB. This patch fixes both of these cases. Backports commit afd46fcad2dceffda35c0586f5723c127b6e09d8 from qemu
2018-04-11 23:57:23 +00:00
/* Undo the setting in cpu_tb_exec. */
cpu->can_do_io = 1;
cpu-exec: Migrate some generic fns to cpu-exec-common The goal is to split the functions such that cpu-exec is CPU specific content, while cpus-exec-common.c is generic code only. The function interface to cpu-exec needs to be virtualised to prepare support for multi-arch and moving these definitions out saves bloating the QOM interface. So move these definitions out of cpu-exec to a new module, cpu-exec-common. Backports commit 5abf9495ca9ff41160260ac274115825c10545cc from qemu
2018-02-15 19:50:06 +00:00
siglongjmp(cpu->jmp_env, 1);
}
void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc)
{
if (pc) {
icount: fix cpu_restore_state_from_tb for non-tb-exit cases In icount mode, instructions that access io memory spaces in the middle of the translation block invoke TB recompilation. After recompilation, such instructions become last in the TB and are allowed to access io memory spaces. When the code includes instruction like i386 'xchg eax, 0xffffd080' which accesses APIC, QEMU goes into an infinite loop of the recompilation. This instruction includes two memory accesses - one read and one write. After the first access, APIC calls cpu_report_tpr_access, which restores the CPU state to get the current eip. But cpu_restore_state_from_tb resets the cpu->can_do_io flag which makes the second memory access invalid. Therefore the second memory access causes a recompilation of the block. Then these operations repeat again and again. This patch moves resetting cpu->can_do_io flag from cpu_restore_state_from_tb to cpu_loop_exit* functions. It also adds a parameter for cpu_restore_state which controls restoring icount. There is no need to restore icount when we only query CPU state without breaking the TB. Restoring it in such cases leads to the incorrect flow of the virtual time. In most cases new parameter is true (icount should be recalculated). But there are two cases in i386 and openrisc when the CPU state is only queried without the need to break the TB. This patch fixes both of these cases. Backports commit afd46fcad2dceffda35c0586f5723c127b6e09d8 from qemu
2018-04-11 23:57:23 +00:00
cpu_restore_state(cpu, pc, true);
cpu-exec: Migrate some generic fns to cpu-exec-common The goal is to split the functions such that cpu-exec is CPU specific content, while cpus-exec-common.c is generic code only. The function interface to cpu-exec needs to be virtualised to prepare support for multi-arch and moving these definitions out saves bloating the QOM interface. So move these definitions out of cpu-exec to a new module, cpu-exec-common. Backports commit 5abf9495ca9ff41160260ac274115825c10545cc from qemu
2018-02-15 19:50:06 +00:00
}
icount: fix cpu_restore_state_from_tb for non-tb-exit cases In icount mode, instructions that access io memory spaces in the middle of the translation block invoke TB recompilation. After recompilation, such instructions become last in the TB and are allowed to access io memory spaces. When the code includes instruction like i386 'xchg eax, 0xffffd080' which accesses APIC, QEMU goes into an infinite loop of the recompilation. This instruction includes two memory accesses - one read and one write. After the first access, APIC calls cpu_report_tpr_access, which restores the CPU state to get the current eip. But cpu_restore_state_from_tb resets the cpu->can_do_io flag which makes the second memory access invalid. Therefore the second memory access causes a recompilation of the block. Then these operations repeat again and again. This patch moves resetting cpu->can_do_io flag from cpu_restore_state_from_tb to cpu_loop_exit* functions. It also adds a parameter for cpu_restore_state which controls restoring icount. There is no need to restore icount when we only query CPU state without breaking the TB. Restoring it in such cases leads to the incorrect flow of the virtual time. In most cases new parameter is true (icount should be recalculated). But there are two cases in i386 and openrisc when the CPU state is only queried without the need to break the TB. This patch fixes both of these cases. Backports commit afd46fcad2dceffda35c0586f5723c127b6e09d8 from qemu
2018-04-11 23:57:23 +00:00
cpu_loop_exit(cpu);
cputlb.c: Use correct address space when looking up MemoryRegionSection When looking up the MemoryRegionSection for the new TLB entry in tlb_set_page_with_attrs(), use cpu_asidx_from_attrs() to determine the correct address space index for the lookup, and pass it into address_space_translate_for_iotlb(). Backports commit d7898cda81b6efa6b2d7a749882695cdcf280eaa from qemu
2018-02-18 03:50:28 +00:00
}
tcg: Add EXCP_ATOMIC When we cannot emulate an atomic operation within a parallel context, this exception allows us to stop the world and try again in a serial context. Backports commit fdbc2b5722f6092e47181a947c90fd4bdcc1c121 from qemu Also backports parts of commit 02d57ea115b7669f588371c86484a2e8ebc369be
2018-02-27 16:12:36 +00:00
void cpu_loop_exit_atomic(CPUState *cpu, uintptr_t pc)
{
cpu->exception_index = EXCP_ATOMIC;
cpu_loop_exit_restore(cpu, pc);
}
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