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translate-all: add DEBUG_LOCKING asserts

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This adds asserts to check the locking on the various translation
engines structures. There are two sets of structures that are protected
by locks.

The first the l1map and PageDesc structures used to track which
translation blocks are associated with which physical addresses. In
user-mode this is covered by the mmap_lock.

The second case are TB context related structures which are protected by
tb_lock which is also user-mode only.

Currently the asserts do nothing in SoftMMU mode but this will change
for MTTCG.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-Id: <20161027151030.20863-4-alex.bennee@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alex Bennée 2016-10-27 16:10:00 +01:00 • committed by Paolo Bonzini
parent 955939a2b5
commit 301e40ed80
4 changed files with 52 additions and 0 deletions
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41
translate-all.c
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@ -31,6 +31,7 @@
#include "tcg.h"
#if defined(CONFIG_USER_ONLY)
#include "qemu.h"
#include "exec/exec-all.h"
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#include <sys/param.h>
#if __FreeBSD_version >= 700104
@ -58,6 +59,7 @@
/* #define DEBUG_TB_INVALIDATE */
/* #define DEBUG_TB_FLUSH */
/* #define DEBUG_LOCKING */
/* make various TB consistency checks */
/* #define DEBUG_TB_CHECK */
@ -66,6 +68,28 @@
#undef DEBUG_TB_CHECK
#endif
/* Access to the various translations structures need to be serialised via locks
* for consistency. This is automatic for SoftMMU based system
* emulation due to its single threaded nature. In user-mode emulation
* access to the memory related structures are protected with the
* mmap_lock.
*/
#ifdef DEBUG_LOCKING
#define DEBUG_MEM_LOCKS 1
#else
#define DEBUG_MEM_LOCKS 0
#endif
#ifdef CONFIG_SOFTMMU
#define assert_memory_lock() do { /* nothing */ } while (0)
#else
#define assert_memory_lock() do { \
if (DEBUG_MEM_LOCKS) { \
g_assert(have_mmap_lock()); \
} \
} while (0)
#endif
#define SMC_BITMAP_USE_THRESHOLD 10
typedef struct PageDesc {
@ -173,6 +197,23 @@ void tb_lock_reset(void)
#endif
}
#ifdef DEBUG_LOCKING
#define DEBUG_TB_LOCKS 1
#else
#define DEBUG_TB_LOCKS 0
#endif
#ifdef CONFIG_SOFTMMU
#define assert_tb_lock() do { /* nothing */ } while (0)
#else
#define assert_tb_lock() do { \
if (DEBUG_TB_LOCKS) { \
g_assert(have_tb_lock); \
} \
} while (0)
#endif
static TranslationBlock *tb_find_pc(uintptr_t tc_ptr);
void cpu_gen_init(void)