* the terms and conditions for use and redistribution.
*/
-#include <mach_rt.h>
-#include <platforms.h>
#include <mach_ldebug.h>
#include <i386/asm.h>
#include <i386/eflags.h>
#include <i386/pal_lock_asm.h>
-/*
- * When performance isn't the only concern, it's
- * nice to build stack frames...
- */
-#define BUILD_STACK_FRAMES (GPROF)
-
-#if BUILD_STACK_FRAMES
-
-/* Stack-frame-relative: */
-#define L_PC B_PC
-#define L_ARG0 B_ARG0
-#define L_ARG1 B_ARG1
-
-#define LEAF_ENTRY(name) \
- Entry(name); \
- FRAME; \
- MCOUNT
-
-#define LEAF_ENTRY2(n1,n2) \
- Entry(n1); \
- Entry(n2); \
- FRAME; \
- MCOUNT
-
-#define LEAF_RET \
- EMARF; \
- ret
-
-#else /* BUILD_STACK_FRAMES */
-
-/* Stack-pointer-relative: */
-#define L_PC S_PC
-#define L_ARG0 S_ARG0
-#define L_ARG1 S_ARG1
-
#define LEAF_ENTRY(name) \
Entry(name)
#define LEAF_RET \
ret
-#endif /* BUILD_STACK_FRAMES */
-
-
/* Non-leaf routines always have a stack frame: */
#define NONLEAF_ENTRY(name) \
Entry(name); \
- FRAME; \
- MCOUNT
+ FRAME
#define NONLEAF_ENTRY2(n1,n2) \
Entry(n1); \
Entry(n2); \
- FRAME; \
- MCOUNT
+ FRAME
#define NONLEAF_RET \
EMARF; \
.text ; \
1:
+#define CHECK_MYLOCK(current, owner) \
+ cmp current, owner ; \
+ jne 1f ; \
+ ALIGN_STACK() ; \
+ LOAD_STRING_ARG0(2f) ; \
+ CALL_PANIC() ; \
+ hlt ; \
+ .data ; \
+2: String "Attempt to recursively lock a non-recursive lock"; \
+ .text ; \
+1:
+
+#else /* MACH_LDEBUG */
+#define CHECK_MUTEX_TYPE()
+#define CHECK_MYLOCK(thd)
+#endif /* MACH_LDEBUG */
+
+#if DEVELOPMENT || DEBUG
/*
* If one or more simplelocks are currently held by a thread,
* an attempt to acquire a mutex will cause this check to fail
* (since a mutex lock may context switch, holding a simplelock
* is not a good thing).
*/
-#if MACH_RT
#define CHECK_PREEMPTION_LEVEL() \
- cmpl $0,%gs:CPU_HIBERNATE ; \
- jne 1f ; \
cmpl $0,%gs:CPU_PREEMPTION_LEVEL ; \
je 1f ; \
+ cmpl $0,EXT(LckDisablePreemptCheck)(%rip) ; \
+ jne 1f ; \
+ cmpl $0,%gs:CPU_HIBERNATE ; \
+ jne 1f ; \
ALIGN_STACK() ; \
movl %gs:CPU_PREEMPTION_LEVEL, %eax ; \
LOAD_ARG1(%eax) ; \
2: String "preemption_level(%d) != 0!" ; \
.text ; \
1:
-#else /* MACH_RT */
-#define CHECK_PREEMPTION_LEVEL()
-#endif /* MACH_RT */
-
-#define CHECK_MYLOCK(current, owner) \
- cmp current, owner ; \
- jne 1f ; \
- ALIGN_STACK() ; \
- LOAD_STRING_ARG0(2f) ; \
- CALL_PANIC() ; \
- hlt ; \
- .data ; \
-2: String "Attempt to recursively lock a non-recursive lock"; \
- .text ; \
-1:
-
-#else /* MACH_LDEBUG */
-#define CHECK_MUTEX_TYPE()
+#else /* DEVELOPMENT || DEBUG */
#define CHECK_PREEMPTION_LEVEL()
-#define CHECK_MYLOCK(thd)
-#endif /* MACH_LDEBUG */
+#endif /* DEVELOPMENT || DEBUG */
#define PREEMPTION_DISABLE \
incl %gs:CPU_PREEMPTION_LEVEL
* register initially, and then either a byte or register-sized
* word is loaded/stored to the pointer
*/
-
-#define HW_LOCK_REGISTER %rdi
-#define LOAD_HW_LOCK_REGISTER
-#define HW_LOCK_THREAD_REGISTER %rcx
-#define LOAD_HW_LOCK_THREAD_REGISTER mov %gs:CPU_ACTIVE_THREAD, HW_LOCK_THREAD_REGISTER
-#define HW_LOCK_MOV_WORD movq
-#define HW_LOCK_EXAM_REGISTER %rax
-
-/*
- * void hw_lock_init(hw_lock_t)
- *
- * Initialize a hardware lock.
- */
-LEAF_ENTRY(hw_lock_init)
- LOAD_HW_LOCK_REGISTER /* fetch lock pointer */
- HW_LOCK_MOV_WORD $0, (HW_LOCK_REGISTER) /* clear the lock */
- LEAF_RET
-
/*
* void hw_lock_byte_init(volatile uint8_t *)
* Initialize a hardware byte lock.
*/
LEAF_ENTRY(hw_lock_byte_init)
- LOAD_HW_LOCK_REGISTER /* fetch lock pointer */
- movb $0, (HW_LOCK_REGISTER) /* clear the lock */
+ movb $0, (%rdi) /* clear the lock */
LEAF_RET
-/*
- * void hw_lock_lock(hw_lock_t)
- *
- * Acquire lock, spinning until it becomes available.
- * MACH_RT: also return with preemption disabled.
- */
-LEAF_ENTRY(hw_lock_lock)
- LOAD_HW_LOCK_REGISTER /* fetch lock pointer */
- LOAD_HW_LOCK_THREAD_REGISTER /* get thread pointer */
-
- PREEMPTION_DISABLE
-1:
- mov (HW_LOCK_REGISTER), HW_LOCK_EXAM_REGISTER
- test HW_LOCK_EXAM_REGISTER,HW_LOCK_EXAM_REGISTER /* lock locked? */
- jne 3f /* branch if so */
- lock; cmpxchg HW_LOCK_THREAD_REGISTER,(HW_LOCK_REGISTER) /* try to acquire the HW lock */
- jne 3f
- movl $1,%eax /* In case this was a timeout call */
- LEAF_RET /* if yes, then nothing left to do */
-3:
- PAUSE /* pause for hyper-threading */
- jmp 1b /* try again */
-
/*
* void hw_lock_byte_lock(uint8_t *lock_byte)
*
* Acquire byte sized lock operand, spinning until it becomes available.
- * MACH_RT: also return with preemption disabled.
+ * return with preemption disabled.
*/
LEAF_ENTRY(hw_lock_byte_lock)
- LOAD_HW_LOCK_REGISTER /* Load lock pointer */
PREEMPTION_DISABLE
movl $1, %ecx /* Set lock value */
1:
- movb (HW_LOCK_REGISTER), %al /* Load byte at address */
+ movb (%rdi), %al /* Load byte at address */
testb %al,%al /* lock locked? */
jne 3f /* branch if so */
- lock; cmpxchg %cl,(HW_LOCK_REGISTER) /* attempt atomic compare exchange */
+ lock; cmpxchg %cl,(%rdi) /* attempt atomic compare exchange */
jne 3f
LEAF_RET /* if yes, then nothing left to do */
3:
PAUSE /* pause for hyper-threading */
jmp 1b /* try again */
-/*
- * unsigned int hw_lock_to(hw_lock_t, unsigned int)
- *
- * Acquire lock, spinning until it becomes available or timeout.
- * MACH_RT: also return with preemption disabled.
- */
-LEAF_ENTRY(hw_lock_to)
-1:
- LOAD_HW_LOCK_REGISTER /* fetch lock pointer */
- LOAD_HW_LOCK_THREAD_REGISTER
-
- /*
- * Attempt to grab the lock immediately
- * - fastpath without timeout nonsense.
- */
- PREEMPTION_DISABLE
-
- mov (HW_LOCK_REGISTER), HW_LOCK_EXAM_REGISTER
- test HW_LOCK_EXAM_REGISTER,HW_LOCK_EXAM_REGISTER /* lock locked? */
- jne 2f /* branch if so */
- lock; cmpxchg HW_LOCK_THREAD_REGISTER,(HW_LOCK_REGISTER) /* try to acquire the HW lock */
- jne 2f /* branch on failure */
- movl $1,%eax
- LEAF_RET
-
-2:
-#define INNER_LOOP_COUNT 1000
- /*
- * Failed to get the lock so set the timeout
- * and then spin re-checking the lock but pausing
- * every so many (INNER_LOOP_COUNT) spins to check for timeout.
- */
- push %r9
- lfence
- rdtsc /* read cyclecount into %edx:%eax */
- shlq $32, %rdx
- orq %rdx, %rax /* load 64-bit quantity into %rax */
- addq %rax, %rsi /* %rsi is the timeout expiry */
-
-4:
- /*
- * The inner-loop spin to look for the lock being freed.
- */
- mov $(INNER_LOOP_COUNT),%r9
-5:
- PAUSE /* pause for hyper-threading */
- mov (HW_LOCK_REGISTER),HW_LOCK_EXAM_REGISTER /* spin checking lock value in cache */
- test HW_LOCK_EXAM_REGISTER,HW_LOCK_EXAM_REGISTER
- je 6f /* zero => unlocked, try to grab it */
- decq %r9 /* decrement inner loop count */
- jnz 5b /* time to check for timeout? */
-
- /*
- * Here after spinning INNER_LOOP_COUNT times, check for timeout
- */
- lfence
- rdtsc /* cyclecount into %edx:%eax */
- shlq $32, %rdx
- orq %rdx, %rax /* load 64-bit quantity into %rax */
- cmpq %rsi, %rax /* compare to timeout */
- jb 4b /* continue spinning if less, or */
- xor %rax,%rax /* with 0 return value */
- pop %r9
- LEAF_RET
-
-6:
- /*
- * Here to try to grab the lock that now appears to be free
- * after contention.
- */
- LOAD_HW_LOCK_THREAD_REGISTER
- lock; cmpxchg HW_LOCK_THREAD_REGISTER,(HW_LOCK_REGISTER) /* try to acquire the HW lock */
- jne 4b /* no - spin again */
- movl $1,%eax /* yes */
- pop %r9
- LEAF_RET
-
-/*
- * void hw_lock_unlock(hw_lock_t)
- *
- * Unconditionally release lock.
- * MACH_RT: release preemption level.
- */
-LEAF_ENTRY(hw_lock_unlock)
- LOAD_HW_LOCK_REGISTER /* fetch lock pointer */
- HW_LOCK_MOV_WORD $0, (HW_LOCK_REGISTER) /* clear the lock */
- PREEMPTION_ENABLE
- LEAF_RET
-
/*
* void hw_lock_byte_unlock(uint8_t *lock_byte)
*
- * Unconditionally release byte sized lock operand.
- * MACH_RT: release preemption level.
+ * Unconditionally release byte sized lock operand,
+ * release preemption level.
*/
LEAF_ENTRY(hw_lock_byte_unlock)
- LOAD_HW_LOCK_REGISTER /* Load lock pointer */
- movb $0, (HW_LOCK_REGISTER) /* Clear the lock byte */
+ movb $0, (%rdi) /* Clear the lock byte */
PREEMPTION_ENABLE
LEAF_RET
-
-/*
- * unsigned int hw_lock_try(hw_lock_t)
- * MACH_RT: returns with preemption disabled on success.
- */
-LEAF_ENTRY(hw_lock_try)
- LOAD_HW_LOCK_REGISTER /* fetch lock pointer */
- LOAD_HW_LOCK_THREAD_REGISTER
- PREEMPTION_DISABLE
-
- mov (HW_LOCK_REGISTER),HW_LOCK_EXAM_REGISTER
- test HW_LOCK_EXAM_REGISTER,HW_LOCK_EXAM_REGISTER
- jne 1f
- lock; cmpxchg HW_LOCK_THREAD_REGISTER,(HW_LOCK_REGISTER) /* try to acquire the HW lock */
- jne 1f
-
- movl $1,%eax /* success */
- LEAF_RET
-
-1:
- PREEMPTION_ENABLE /* failure: release preemption... */
- xorl %eax,%eax /* ...and return failure */
- LEAF_RET
-
-/*
- * unsigned int hw_lock_held(hw_lock_t)
- * MACH_RT: doesn't change preemption state.
- * N.B. Racy, of course.
- */
-LEAF_ENTRY(hw_lock_held)
- LOAD_HW_LOCK_REGISTER /* fetch lock pointer */
- mov (HW_LOCK_REGISTER),HW_LOCK_EXAM_REGISTER /* check lock value */
- test HW_LOCK_EXAM_REGISTER,HW_LOCK_EXAM_REGISTER
- movl $1,%ecx
- cmovne %ecx,%eax /* 0 => unlocked, 1 => locked */
- LEAF_RET
-
-
-/*
- * Reader-writer lock fastpaths. These currently exist for the
- * shared lock acquire, the exclusive lock acquire, the shared to
- * exclusive upgrade and the release paths (where they reduce overhead
- * considerably) -- these are by far the most frequently used routines
- *
- * The following should reflect the layout of the bitfield embedded within
- * the lck_rw_t structure (see i386/locks.h).
- */
-#define LCK_RW_INTERLOCK (0x1 << 16)
-
-#define LCK_RW_PRIV_EXCL (0x1 << 24)
-#define LCK_RW_WANT_UPGRADE (0x2 << 24)
-#define LCK_RW_WANT_WRITE (0x4 << 24)
-#define LCK_R_WAITING (0x8 << 24)
-#define LCK_W_WAITING (0x10 << 24)
-
-#define LCK_RW_SHARED_MASK (0xffff)
-
-/*
- * For most routines, the lck_rw_t pointer is loaded into a
- * register initially, and the flags bitfield loaded into another
- * register and examined
- */
-
-#define LCK_RW_REGISTER %rdi
-#define LOAD_LCK_RW_REGISTER
-#define LCK_RW_FLAGS_REGISTER %eax
-#define LOAD_LCK_RW_FLAGS_REGISTER mov (LCK_RW_REGISTER), LCK_RW_FLAGS_REGISTER
-
-#define RW_LOCK_SHARED_MASK (LCK_RW_INTERLOCK | LCK_RW_WANT_UPGRADE | LCK_RW_WANT_WRITE)
-/*
- * void lck_rw_lock_shared(lck_rw_t *)
- *
- */
-Entry(lck_rw_lock_shared)
- mov %gs:CPU_ACTIVE_THREAD, %rcx /* Load thread pointer */
- incl TH_RWLOCK_COUNT(%rcx) /* Increment count before atomic CAS */
- LOAD_LCK_RW_REGISTER
-1:
- LOAD_LCK_RW_FLAGS_REGISTER /* Load state bitfield and interlock */
- testl $(RW_LOCK_SHARED_MASK), %eax /* Eligible for fastpath? */
- jne 3f
-
- movl %eax, %ecx /* original value in %eax for cmpxchgl */
- incl %ecx /* Increment reader refcount */
- lock
- cmpxchgl %ecx, (LCK_RW_REGISTER) /* Attempt atomic exchange */
- jne 2f
-
-#if CONFIG_DTRACE
- /*
- * Dtrace lockstat event: LS_LCK_RW_LOCK_SHARED_ACQUIRE
- * Implemented by swapping between return and no-op instructions.
- * See bsd/dev/dtrace/lockstat.c.
- */
- LOCKSTAT_LABEL(_lck_rw_lock_shared_lockstat_patch_point)
- ret
- /*
- Fall thru when patched, counting on lock pointer in LCK_RW_REGISTER
- */
- LOCKSTAT_RECORD(LS_LCK_RW_LOCK_SHARED_ACQUIRE, LCK_RW_REGISTER)
-#endif
- ret
-2:
- PAUSE
- jmp 1b
-3:
- jmp EXT(lck_rw_lock_shared_gen)
-
-
-
-#define RW_TRY_LOCK_SHARED_MASK (LCK_RW_WANT_UPGRADE | LCK_RW_WANT_WRITE)
-/*
- * void lck_rw_try_lock_shared(lck_rw_t *)
- *
- */
-Entry(lck_rw_try_lock_shared)
- LOAD_LCK_RW_REGISTER
-1:
- LOAD_LCK_RW_FLAGS_REGISTER /* Load state bitfield and interlock */
- testl $(LCK_RW_INTERLOCK), %eax
- jne 2f
- testl $(RW_TRY_LOCK_SHARED_MASK), %eax
- jne 3f /* lock is busy */
-
- movl %eax, %ecx /* original value in %eax for cmpxchgl */
- incl %ecx /* Increment reader refcount */
- lock
- cmpxchgl %ecx, (LCK_RW_REGISTER) /* Attempt atomic exchange */
- jne 2f
-
- mov %gs:CPU_ACTIVE_THREAD, %rcx /* Load thread pointer */
- incl TH_RWLOCK_COUNT(%rcx) /* Increment count on success. */
- /* There is a 3 instr window where preemption may not notice rwlock_count after cmpxchg */
-
-#if CONFIG_DTRACE
- movl $1, %eax
- /*
- * Dtrace lockstat event: LS_LCK_RW_TRY_LOCK_SHARED_ACQUIRE
- * Implemented by swapping between return and no-op instructions.
- * See bsd/dev/dtrace/lockstat.c.
- */
- LOCKSTAT_LABEL(_lck_rw_try_lock_shared_lockstat_patch_point)
- ret
- /* Fall thru when patched, counting on lock pointer in LCK_RW_REGISTER */
- LOCKSTAT_RECORD(LS_LCK_RW_TRY_LOCK_SHARED_ACQUIRE, LCK_RW_REGISTER)
-#endif
- movl $1, %eax /* return TRUE */
- ret
-2:
- PAUSE
- jmp 1b
-3:
- xorl %eax, %eax
- ret
-
-
-#define RW_LOCK_EXCLUSIVE_HELD (LCK_RW_WANT_WRITE | LCK_RW_WANT_UPGRADE)
-/*
- * int lck_rw_grab_shared(lck_rw_t *)
- *
- */
-Entry(lck_rw_grab_shared)
- LOAD_LCK_RW_REGISTER
-1:
- LOAD_LCK_RW_FLAGS_REGISTER /* Load state bitfield and interlock */
- testl $(LCK_RW_INTERLOCK), %eax
- jne 5f
- testl $(RW_LOCK_EXCLUSIVE_HELD), %eax
- jne 3f
-2:
- movl %eax, %ecx /* original value in %eax for cmpxchgl */
- incl %ecx /* Increment reader refcount */
- lock
- cmpxchgl %ecx, (LCK_RW_REGISTER) /* Attempt atomic exchange */
- jne 4f
-
- movl $1, %eax /* return success */
- ret
-3:
- testl $(LCK_RW_SHARED_MASK), %eax
- je 4f
- testl $(LCK_RW_PRIV_EXCL), %eax
- je 2b
-4:
- xorl %eax, %eax /* return failure */
- ret
-5:
- PAUSE
- jmp 1b
-
-
-
-#define RW_LOCK_EXCLUSIVE_MASK (LCK_RW_SHARED_MASK | LCK_RW_INTERLOCK | \
- LCK_RW_WANT_UPGRADE | LCK_RW_WANT_WRITE)
-/*
- * void lck_rw_lock_exclusive(lck_rw_t*)
- *
- */
-Entry(lck_rw_lock_exclusive)
- mov %gs:CPU_ACTIVE_THREAD, %rcx /* Load thread pointer */
- incl TH_RWLOCK_COUNT(%rcx) /* Increment count before atomic CAS */
- LOAD_LCK_RW_REGISTER
-1:
- LOAD_LCK_RW_FLAGS_REGISTER /* Load state bitfield, interlock and shared count */
- testl $(RW_LOCK_EXCLUSIVE_MASK), %eax /* Eligible for fastpath? */
- jne 3f /* no, go slow */
-
- movl %eax, %ecx /* original value in %eax for cmpxchgl */
- orl $(LCK_RW_WANT_WRITE), %ecx
- lock
- cmpxchgl %ecx, (LCK_RW_REGISTER) /* Attempt atomic exchange */
- jne 2f
-
-#if CONFIG_DTRACE
- /*
- * Dtrace lockstat event: LS_LCK_RW_LOCK_EXCL_ACQUIRE
- * Implemented by swapping between return and no-op instructions.
- * See bsd/dev/dtrace/lockstat.c.
- */
- LOCKSTAT_LABEL(_lck_rw_lock_exclusive_lockstat_patch_point)
- ret
- /* Fall thru when patched, counting on lock pointer in LCK_RW_REGISTER */
- LOCKSTAT_RECORD(LS_LCK_RW_LOCK_EXCL_ACQUIRE, LCK_RW_REGISTER)
-#endif
- ret
-2:
- PAUSE
- jmp 1b
-3:
- jmp EXT(lck_rw_lock_exclusive_gen)
-
-
-
-#define RW_TRY_LOCK_EXCLUSIVE_MASK (LCK_RW_SHARED_MASK | LCK_RW_WANT_UPGRADE | LCK_RW_WANT_WRITE)
-/*
- * void lck_rw_try_lock_exclusive(lck_rw_t *)
- *
- * Tries to get a write lock.
- *
- * Returns FALSE if the lock is not held on return.
- */
-Entry(lck_rw_try_lock_exclusive)
- LOAD_LCK_RW_REGISTER
-1:
- LOAD_LCK_RW_FLAGS_REGISTER /* Load state bitfield, interlock and shared count */
- testl $(LCK_RW_INTERLOCK), %eax
- jne 2f
- testl $(RW_TRY_LOCK_EXCLUSIVE_MASK), %eax
- jne 3f /* can't get it */
-
- movl %eax, %ecx /* original value in %eax for cmpxchgl */
- orl $(LCK_RW_WANT_WRITE), %ecx
- lock
- cmpxchgl %ecx, (LCK_RW_REGISTER) /* Attempt atomic exchange */
- jne 2f
-
- mov %gs:CPU_ACTIVE_THREAD, %rcx /* Load thread pointer */
- incl TH_RWLOCK_COUNT(%rcx) /* Increment count on success. */
- /* There is a 3 instr window where preemption may not notice rwlock_count after cmpxchg */
-
-#if CONFIG_DTRACE
- movl $1, %eax
- /*
- * Dtrace lockstat event: LS_LCK_RW_TRY_LOCK_EXCL_ACQUIRE
- * Implemented by swapping between return and no-op instructions.
- * See bsd/dev/dtrace/lockstat.c.
- */
- LOCKSTAT_LABEL(_lck_rw_try_lock_exclusive_lockstat_patch_point)
- ret
- /* Fall thru when patched, counting on lock pointer in LCK_RW_REGISTER */
- LOCKSTAT_RECORD(LS_LCK_RW_TRY_LOCK_EXCL_ACQUIRE, LCK_RW_REGISTER)
-#endif
- movl $1, %eax /* return TRUE */
- ret
-2:
- PAUSE
- jmp 1b
-3:
- xorl %eax, %eax /* return FALSE */
- ret
-
-
-
-/*
- * void lck_rw_lock_shared_to_exclusive(lck_rw_t*)
- *
- * fastpath can be taken if
- * the current rw_shared_count == 1
- * AND the interlock is clear
- * AND RW_WANT_UPGRADE is not set
- *
- * note that RW_WANT_WRITE could be set, but will not
- * be indicative of an exclusive hold since we have
- * a read count on the lock that we have not yet released
- * we can blow by that state since the lck_rw_lock_exclusive
- * function will block until rw_shared_count == 0 and
- * RW_WANT_UPGRADE is clear... it does this check behind
- * the interlock which we are also checking for
- *
- * to make the transition we must be able to atomically
- * set RW_WANT_UPGRADE and get rid of the read count we hold
- */
-Entry(lck_rw_lock_shared_to_exclusive)
- LOAD_LCK_RW_REGISTER
-1:
- LOAD_LCK_RW_FLAGS_REGISTER /* Load state bitfield, interlock and shared count */
- testl $(LCK_RW_INTERLOCK), %eax
- jne 7f
- testl $(LCK_RW_WANT_UPGRADE), %eax
- jne 2f
-
- movl %eax, %ecx /* original value in %eax for cmpxchgl */
- orl $(LCK_RW_WANT_UPGRADE), %ecx /* ask for WANT_UPGRADE */
- decl %ecx /* and shed our read count */
- lock
- cmpxchgl %ecx, (LCK_RW_REGISTER) /* Attempt atomic exchange */
- jne 7f
- /* we now own the WANT_UPGRADE */
- testl $(LCK_RW_SHARED_MASK), %ecx /* check to see if all of the readers are drained */
- jne 8f /* if not, we need to go wait */
-
-#if CONFIG_DTRACE
- movl $1, %eax
- /*
- * Dtrace lockstat event: LS_LCK_RW_LOCK_SHARED_TO_EXCL_UPGRADE
- * Implemented by swapping between return and no-op instructions.
- * See bsd/dev/dtrace/lockstat.c.
- */
- LOCKSTAT_LABEL(_lck_rw_lock_shared_to_exclusive_lockstat_patch_point)
- ret
- /* Fall thru when patched, counting on lock pointer in LCK_RW_REGISTER */
- LOCKSTAT_RECORD(LS_LCK_RW_LOCK_SHARED_TO_EXCL_UPGRADE, LCK_RW_REGISTER)
-#endif
- movl $1, %eax /* return success */
- ret
-
-2: /* someone else already holds WANT_UPGRADE */
- movl %eax, %ecx /* original value in %eax for cmpxchgl */
- decl %ecx /* shed our read count */
- testl $(LCK_RW_SHARED_MASK), %ecx
- jne 3f /* we were the last reader */
- andl $(~LCK_W_WAITING), %ecx /* so clear the wait indicator */
-3:
- lock
- cmpxchgl %ecx, (LCK_RW_REGISTER) /* Attempt atomic exchange */
- jne 7f
-
- mov %eax, %esi /* put old flags as second arg */
- /* lock is alread in %rdi */
- call EXT(lck_rw_lock_shared_to_exclusive_failure)
- ret /* and pass the failure return along */
-7:
- PAUSE
- jmp 1b
-8:
- jmp EXT(lck_rw_lock_shared_to_exclusive_success)
-
-
-
- .cstring
-rwl_release_error_str:
- .asciz "Releasing non-exclusive RW lock without a reader refcount!"
- .text
-
-/*
- * lck_rw_type_t lck_rw_done(lck_rw_t *)
- *
- */
-Entry(lck_rw_done)
- LOAD_LCK_RW_REGISTER
-1:
- LOAD_LCK_RW_FLAGS_REGISTER /* Load state bitfield, interlock and reader count */
- testl $(LCK_RW_INTERLOCK), %eax
- jne 7f /* wait for interlock to clear */
-
- movl %eax, %ecx /* keep original value in %eax for cmpxchgl */
- testl $(LCK_RW_SHARED_MASK), %ecx /* if reader count == 0, must be exclusive lock */
- je 2f
- decl %ecx /* Decrement reader count */
- testl $(LCK_RW_SHARED_MASK), %ecx /* if reader count has now gone to 0, check for waiters */
- je 4f
- jmp 6f
-2:
- testl $(LCK_RW_WANT_UPGRADE), %ecx
- je 3f
- andl $(~LCK_RW_WANT_UPGRADE), %ecx
- jmp 4f
-3:
- testl $(LCK_RW_WANT_WRITE), %ecx
- je 8f /* lock is not 'owned', go panic */
- andl $(~LCK_RW_WANT_WRITE), %ecx
-4:
- /*
- * test the original values to match what
- * lck_rw_done_gen is going to do to determine
- * which wakeups need to happen...
- *
- * if !(fake_lck->lck_rw_priv_excl && fake_lck->lck_w_waiting)
- */
- testl $(LCK_W_WAITING), %eax
- je 5f
- andl $(~LCK_W_WAITING), %ecx
-
- testl $(LCK_RW_PRIV_EXCL), %eax
- jne 6f
-5:
- andl $(~LCK_R_WAITING), %ecx
-6:
- lock
- cmpxchgl %ecx, (LCK_RW_REGISTER) /* Attempt atomic exchange */
- jne 7f
-
- mov %eax,%esi /* old flags in %rsi */
- /* lock is in %rdi already */
- call EXT(lck_rw_done_gen)
- ret
-7:
- PAUSE
- jmp 1b
-8:
- ALIGN_STACK()
- LOAD_STRING_ARG0(rwl_release_error_str)
- CALL_PANIC()
-
-
-
-/*
- * lck_rw_type_t lck_rw_lock_exclusive_to_shared(lck_rw_t *)
- *
- */
-Entry(lck_rw_lock_exclusive_to_shared)
- LOAD_LCK_RW_REGISTER
-1:
- LOAD_LCK_RW_FLAGS_REGISTER /* Load state bitfield, interlock and reader count */
- testl $(LCK_RW_INTERLOCK), %eax
- jne 6f /* wait for interlock to clear */
-
- movl %eax, %ecx /* keep original value in %eax for cmpxchgl */
- incl %ecx /* Increment reader count */
-
- testl $(LCK_RW_WANT_UPGRADE), %ecx
- je 2f
- andl $(~LCK_RW_WANT_UPGRADE), %ecx
- jmp 3f
-2:
- andl $(~LCK_RW_WANT_WRITE), %ecx
-3:
- /*
- * test the original values to match what
- * lck_rw_lock_exclusive_to_shared_gen is going to do to determine
- * which wakeups need to happen...
- *
- * if !(fake_lck->lck_rw_priv_excl && fake_lck->lck_w_waiting)
- */
- testl $(LCK_W_WAITING), %eax
- je 4f
- testl $(LCK_RW_PRIV_EXCL), %eax
- jne 5f
-4:
- andl $(~LCK_R_WAITING), %ecx
-5:
- lock
- cmpxchgl %ecx, (LCK_RW_REGISTER) /* Attempt atomic exchange */
- jne 6f
-
- mov %eax,%esi
- call EXT(lck_rw_lock_exclusive_to_shared_gen)
- ret
-6:
- PAUSE
- jmp 1b
-
-
-
-/*
- * int lck_rw_grab_want(lck_rw_t *)
- *
- */
-Entry(lck_rw_grab_want)
- LOAD_LCK_RW_REGISTER
-1:
- LOAD_LCK_RW_FLAGS_REGISTER /* Load state bitfield, interlock and reader count */
- testl $(LCK_RW_INTERLOCK), %eax
- jne 3f /* wait for interlock to clear */
- testl $(LCK_RW_WANT_WRITE), %eax /* want_write has been grabbed by someone else */
- jne 2f /* go return failure */
-
- movl %eax, %ecx /* original value in %eax for cmpxchgl */
- orl $(LCK_RW_WANT_WRITE), %ecx
- lock
- cmpxchgl %ecx, (LCK_RW_REGISTER) /* Attempt atomic exchange */
- jne 2f
- /* we now own want_write */
- movl $1, %eax /* return success */
- ret
-2:
- xorl %eax, %eax /* return failure */
- ret
-3:
- PAUSE
- jmp 1b
-
-
-#define RW_LOCK_SHARED_OR_UPGRADE_MASK (LCK_RW_SHARED_MASK | LCK_RW_INTERLOCK | LCK_RW_WANT_UPGRADE)
-/*
- * int lck_rw_held_read_or_upgrade(lck_rw_t *)
- *
- */
-Entry(lck_rw_held_read_or_upgrade)
- LOAD_LCK_RW_REGISTER
- LOAD_LCK_RW_FLAGS_REGISTER /* Load state bitfield, interlock and reader count */
- andl $(RW_LOCK_SHARED_OR_UPGRADE_MASK), %eax
- ret
-
-
/*
* N.B.: On x86, statistics are currently recorded for all indirect mutexes.
#define M_PTR MUTEX_PTR
#define M_STATE MUTEX_STATE
-#define LMTX_ARG0 %rdi
-#define LMTX_ARG1 %rsi
-#define LMTX_REG_ORIG %rdi
-#define LMTX_REG %rdx
-#define LMTX_A_REG %rax
-#define LMTX_A_REG32 %eax
-#define LMTX_C_REG %rcx
-#define LMTX_C_REG32 %ecx
-#define LMTX_RET_REG %rax
-#define LMTX_RET_REG32 %eax
-#define LMTX_LGROUP_REG %r10
-#define LMTX_SSTATE_REG %r11
-#define LOAD_LMTX_REG(arg) mov %rdi, %rdx
-#define LMTX_CHK_EXTENDED cmp LMTX_REG, LMTX_REG_ORIG
-#define LMTX_ASSERT_OWNED cmp $(MUTEX_ASSERT_OWNED), LMTX_ARG1
#define LMTX_ENTER_EXTENDED \
- mov M_PTR(LMTX_REG), LMTX_REG ; \
- xor LMTX_SSTATE_REG, LMTX_SSTATE_REG ; \
- mov MUTEX_GRP(LMTX_REG), LMTX_LGROUP_REG ; \
+ mov M_PTR(%rdx), %rdx ; \
+ xor %r11, %r11 ; \
+ mov MUTEX_GRP(%rdx), %r10 ; \
LOCK_IF_ATOMIC_STAT_UPDATES ; \
- incq GRP_MTX_STAT_UTIL(LMTX_LGROUP_REG)
-
-#define LMTX_EXIT_EXTENDED
-
-#define LMTX_CHK_EXTENDED_EXIT
+ incq GRP_MTX_STAT_UTIL(%r10)
#if LOG_FIRST_MISS_ALONE
#define LMTX_UPDATE_MISS \
- test $1, LMTX_SSTATE_REG ; \
+ test $1, %r11 ; \
jnz 11f ; \
LOCK_IF_ATOMIC_STAT_UPDATES ; \
- incl GRP_MTX_STAT_MISS(LMTX_LGROUP_REG) ; \
- or $1, LMTX_SSTATE_REG ; \
+ incl GRP_MTX_STAT_MISS(%r10) ; \
+ or $1, %r11 ; \
11:
#else
#define LMTX_UPDATE_MISS \
LOCK_IF_ATOMIC_STAT_UPDATES ; \
- incl GRP_MTX_STAT_MISS(LMTX_LGROUP_REG)
+ incl GRP_MTX_STAT_MISS(%r10)
#endif
#if LOG_FIRST_MISS_ALONE
#define LMTX_UPDATE_WAIT \
- test $2, LMTX_SSTATE_REG ; \
+ test $2, %r11 ; \
jnz 11f ; \
LOCK_IF_ATOMIC_STAT_UPDATES ; \
- incl GRP_MTX_STAT_WAIT(LMTX_LGROUP_REG) ; \
- or $2, LMTX_SSTATE_REG ; \
+ incl GRP_MTX_STAT_WAIT(%r10) ; \
+ or $2, %r11 ; \
11:
#else
#define LMTX_UPDATE_WAIT \
LOCK_IF_ATOMIC_STAT_UPDATES ; \
- incl GRP_MTX_STAT_WAIT(LMTX_LGROUP_REG)
+ incl GRP_MTX_STAT_WAIT(%r10)
#endif
*/
#define LMTX_UPDATE_DIRECT_WAIT \
LOCK_IF_ATOMIC_STAT_UPDATES ; \
- incl GRP_MTX_STAT_DIRECT_WAIT(LMTX_LGROUP_REG)
+ incl GRP_MTX_STAT_DIRECT_WAIT(%r10)
#define LMTX_CALLEXT1(func_name) \
- LMTX_CHK_EXTENDED ; \
+ cmp %rdx, %rdi ; \
je 12f ; \
- push LMTX_LGROUP_REG ; \
- push LMTX_SSTATE_REG ; \
-12: push LMTX_REG_ORIG ; \
- push LMTX_REG ; \
- mov LMTX_REG, LMTX_ARG0 ; \
+ push %r10 ; \
+ push %r11 ; \
+12: push %rdi ; \
+ push %rdx ; \
+ mov %rdx, %rdi ; \
call EXT(func_name) ; \
- pop LMTX_REG ; \
- pop LMTX_REG_ORIG ; \
- LMTX_CHK_EXTENDED ; \
+ pop %rdx ; \
+ pop %rdi ; \
+ cmp %rdx, %rdi ; \
je 12f ; \
- pop LMTX_SSTATE_REG ; \
- pop LMTX_LGROUP_REG ; \
+ pop %r11 ; \
+ pop %r10 ; \
12:
#define LMTX_CALLEXT2(func_name, reg) \
- LMTX_CHK_EXTENDED ; \
+ cmp %rdx, %rdi ; \
je 12f ; \
- push LMTX_LGROUP_REG ; \
- push LMTX_SSTATE_REG ; \
-12: push LMTX_REG_ORIG ; \
- push LMTX_REG ; \
- mov reg, LMTX_ARG1 ; \
- mov LMTX_REG, LMTX_ARG0 ; \
+ push %r10 ; \
+ push %r11 ; \
+12: push %rdi ; \
+ push %rdx ; \
+ mov reg, %rsi ; \
+ mov %rdx, %rdi ; \
call EXT(func_name) ; \
- pop LMTX_REG ; \
- pop LMTX_REG_ORIG ; \
- LMTX_CHK_EXTENDED ; \
+ pop %rdx ; \
+ pop %rdi ; \
+ cmp %rdx, %rdi ; \
je 12f ; \
- pop LMTX_SSTATE_REG ; \
- pop LMTX_LGROUP_REG ; \
+ pop %r11 ; \
+ pop %r10 ; \
12:
*/
NONLEAF_ENTRY(lck_mtx_assert)
- LOAD_LMTX_REG(B_ARG0) /* Load lock address */
- mov %gs:CPU_ACTIVE_THREAD, LMTX_A_REG /* Load current thread */
+ mov %rdi, %rdx /* Load lock address */
+ mov %gs:CPU_ACTIVE_THREAD, %rax /* Load current thread */
- mov M_STATE(LMTX_REG), LMTX_C_REG32
- cmp $(MUTEX_IND), LMTX_C_REG32 /* Is this an indirect mutex? */
+ mov M_STATE(%rdx), %ecx
+ cmp $(MUTEX_IND), %ecx /* Is this an indirect mutex? */
jne 0f
- mov M_PTR(LMTX_REG), LMTX_REG /* If so, take indirection */
+ mov M_PTR(%rdx), %rdx /* If so, take indirection */
0:
- mov M_OWNER(LMTX_REG), LMTX_C_REG /* Load owner */
- LMTX_ASSERT_OWNED
+ mov M_OWNER(%rdx), %rcx /* Load owner */
+ cmp $(MUTEX_ASSERT_OWNED), %rsi
jne 2f /* Assert ownership? */
- cmp LMTX_A_REG, LMTX_C_REG /* Current thread match? */
+ cmp %rax, %rcx /* Current thread match? */
jne 3f /* no, go panic */
- testl $(M_ILOCKED_MSK | M_MLOCKED_MSK), M_STATE(LMTX_REG)
+ testl $(M_ILOCKED_MSK | M_MLOCKED_MSK), M_STATE(%rdx)
je 3f
1: /* yes, we own it */
NONLEAF_RET
2:
- cmp LMTX_A_REG, LMTX_C_REG /* Current thread match? */
+ cmp %rax, %rcx /* Current thread match? */
jne 1b /* No, return */
ALIGN_STACK()
- LOAD_PTR_ARG1(LMTX_REG)
+ LOAD_PTR_ARG1(%rdx)
LOAD_STRING_ARG0(mutex_assert_owned_str)
jmp 4f
3:
ALIGN_STACK()
- LOAD_PTR_ARG1(LMTX_REG)
+ LOAD_PTR_ARG1(%rdx)
LOAD_STRING_ARG0(mutex_assert_not_owned_str)
4:
CALL_PANIC()
lck_mtx_destroyed:
ALIGN_STACK()
- LOAD_PTR_ARG1(LMTX_REG)
+ LOAD_PTR_ARG1(%rdx)
LOAD_STRING_ARG0(mutex_interlock_destroyed_str)
CALL_PANIC()
* lck_mtx_convert_spin()
*/
NONLEAF_ENTRY(lck_mtx_lock_spin_always)
- LOAD_LMTX_REG(B_ARG0) /* fetch lock pointer */
+ mov %rdi, %rdx /* fetch lock pointer */
jmp Llmls_avoid_check
NONLEAF_ENTRY(lck_mtx_lock_spin)
- LOAD_LMTX_REG(B_ARG0) /* fetch lock pointer */
+ mov %rdi, %rdx /* fetch lock pointer */
CHECK_PREEMPTION_LEVEL()
Llmls_avoid_check:
- mov M_STATE(LMTX_REG), LMTX_C_REG32
- test $(M_ILOCKED_MSK | M_MLOCKED_MSK), LMTX_C_REG32 /* is the interlock or mutex held */
+ mov M_STATE(%rdx), %ecx
+ test $(M_ILOCKED_MSK | M_MLOCKED_MSK), %ecx /* is the interlock or mutex held */
jnz Llmls_slow
-Llmls_try: /* no - can't be INDIRECT, DESTROYED or locked */
- mov LMTX_C_REG, LMTX_A_REG /* eax contains snapshot for cmpxchgl */
- or $(M_ILOCKED_MSK | M_SPIN_MSK), LMTX_C_REG32
+Llmls_try: /* no - can't be INDIRECT, DESTROYED or locked */
+ mov %rcx, %rax /* eax contains snapshot for cmpxchgl */
+ or $(M_ILOCKED_MSK | M_SPIN_MSK), %ecx
PREEMPTION_DISABLE
lock
- cmpxchg LMTX_C_REG32, M_STATE(LMTX_REG) /* atomic compare and exchange */
+ cmpxchg %ecx, M_STATE(%rdx) /* atomic compare and exchange */
jne Llmls_busy_disabled
- mov %gs:CPU_ACTIVE_THREAD, LMTX_A_REG
- mov LMTX_A_REG, M_OWNER(LMTX_REG) /* record owner of interlock */
+ mov %gs:CPU_ACTIVE_THREAD, %rax
+ mov %rax, M_OWNER(%rdx) /* record owner of interlock */
#if MACH_LDEBUG
- test LMTX_A_REG, LMTX_A_REG
+ test %rax, %rax
jz 1f
- incl TH_MUTEX_COUNT(LMTX_A_REG) /* lock statistic */
+ incl TH_MUTEX_COUNT(%rax) /* lock statistic */
1:
#endif /* MACH_LDEBUG */
- LMTX_CHK_EXTENDED_EXIT
/* return with the interlock held and preemption disabled */
leave
#if CONFIG_DTRACE
LOCKSTAT_LABEL(_lck_mtx_lock_spin_lockstat_patch_point)
ret
- /* inherit lock pointer in LMTX_REG above */
- LOCKSTAT_RECORD(LS_LCK_MTX_LOCK_SPIN_ACQUIRE, LMTX_REG)
+ /* inherit lock pointer in %rdx above */
+ LOCKSTAT_RECORD(LS_LCK_MTX_LOCK_SPIN_ACQUIRE, %rdx)
#endif
ret
Llmls_slow:
- test $M_ILOCKED_MSK, LMTX_C_REG32 /* is the interlock held */
- jz Llml_contended /* no, must have been the mutex */
+ test $M_ILOCKED_MSK, %ecx /* is the interlock held */
+ jz Llml_contended /* no, must have been the mutex */
- cmp $(MUTEX_DESTROYED), LMTX_C_REG32 /* check to see if its marked destroyed */
+ cmp $(MUTEX_DESTROYED), %ecx /* check to see if its marked destroyed */
je lck_mtx_destroyed
- cmp $(MUTEX_IND), LMTX_C_REG32 /* Is this an indirect mutex */
- jne Llmls_loop /* no... must be interlocked */
+ cmp $(MUTEX_IND), %ecx /* Is this an indirect mutex */
+ jne Llmls_loop /* no... must be interlocked */
LMTX_ENTER_EXTENDED
- mov M_STATE(LMTX_REG), LMTX_C_REG32
- test $(M_SPIN_MSK), LMTX_C_REG32
+ mov M_STATE(%rdx), %ecx
+ test $(M_SPIN_MSK), %ecx
jz Llmls_loop1
LMTX_UPDATE_MISS /* M_SPIN_MSK was set, so M_ILOCKED_MSK must also be present */
Llmls_loop:
PAUSE
- mov M_STATE(LMTX_REG), LMTX_C_REG32
+ mov M_STATE(%rdx), %ecx
Llmls_loop1:
- test $(M_ILOCKED_MSK | M_MLOCKED_MSK), LMTX_C_REG32
+ test $(M_ILOCKED_MSK | M_MLOCKED_MSK), %ecx
jz Llmls_try
- test $(M_MLOCKED_MSK), LMTX_C_REG32
- jnz Llml_contended /* mutex owned by someone else, go contend for it */
+ test $(M_MLOCKED_MSK), %ecx
+ jnz Llml_contended /* mutex owned by someone else, go contend for it */
jmp Llmls_loop
Llmls_busy_disabled:
NONLEAF_ENTRY(lck_mtx_lock)
- LOAD_LMTX_REG(B_ARG0) /* fetch lock pointer */
+ mov %rdi, %rdx /* fetch lock pointer */
CHECK_PREEMPTION_LEVEL()
- mov M_STATE(LMTX_REG), LMTX_C_REG32
- test $(M_ILOCKED_MSK | M_MLOCKED_MSK), LMTX_C_REG32 /* is the interlock or mutex held */
+ mov M_STATE(%rdx), %ecx
+ test $(M_ILOCKED_MSK | M_MLOCKED_MSK), %ecx /* is the interlock or mutex held */
jnz Llml_slow
-Llml_try: /* no - can't be INDIRECT, DESTROYED or locked */
- mov LMTX_C_REG, LMTX_A_REG /* eax contains snapshot for cmpxchgl */
- or $(M_ILOCKED_MSK | M_MLOCKED_MSK), LMTX_C_REG32
+Llml_try: /* no - can't be INDIRECT, DESTROYED or locked */
+ mov %rcx, %rax /* eax contains snapshot for cmpxchgl */
+ or $(M_ILOCKED_MSK | M_MLOCKED_MSK), %ecx
PREEMPTION_DISABLE
lock
- cmpxchg LMTX_C_REG32, M_STATE(LMTX_REG) /* atomic compare and exchange */
+ cmpxchg %ecx, M_STATE(%rdx) /* atomic compare and exchange */
jne Llml_busy_disabled
- mov %gs:CPU_ACTIVE_THREAD, LMTX_A_REG
- mov LMTX_A_REG, M_OWNER(LMTX_REG) /* record owner of mutex */
+ mov %gs:CPU_ACTIVE_THREAD, %rax
+ mov %rax, M_OWNER(%rdx) /* record owner of mutex */
#if MACH_LDEBUG
- test LMTX_A_REG, LMTX_A_REG
+ test %rax, %rax
jz 1f
- incl TH_MUTEX_COUNT(LMTX_A_REG) /* lock statistic */
+ incl TH_MUTEX_COUNT(%rax) /* lock statistic */
1:
#endif /* MACH_LDEBUG */
- testl $(M_WAITERS_MSK), M_STATE(LMTX_REG)
+ testl $(M_WAITERS_MSK), M_STATE(%rdx)
jz Llml_finish
LMTX_CALLEXT1(lck_mtx_lock_acquire_x86)
Llml_finish:
- andl $(~M_ILOCKED_MSK), M_STATE(LMTX_REG)
+ andl $(~M_ILOCKED_MSK), M_STATE(%rdx)
PREEMPTION_ENABLE
- LMTX_CHK_EXTENDED /* is this an extended mutex */
+ cmp %rdx, %rdi /* is this an extended mutex */
jne 2f
leave
#if CONFIG_DTRACE
LOCKSTAT_LABEL(_lck_mtx_lock_lockstat_patch_point)
ret
- /* inherit lock pointer in LMTX_REG above */
- LOCKSTAT_RECORD(LS_LCK_MTX_LOCK_ACQUIRE, LMTX_REG)
+ /* inherit lock pointer in %rdx above */
+ LOCKSTAT_RECORD(LS_LCK_MTX_LOCK_ACQUIRE, %rdx)
#endif
ret
2:
- LMTX_EXIT_EXTENDED
leave
#if CONFIG_DTRACE
LOCKSTAT_LABEL(_lck_mtx_lock_ext_lockstat_patch_point)
ret
- /* inherit lock pointer in LMTX_REG above */
- LOCKSTAT_RECORD(LS_LCK_MTX_EXT_LOCK_ACQUIRE, LMTX_REG)
+ /* inherit lock pointer in %rdx above */
+ LOCKSTAT_RECORD(LS_LCK_MTX_EXT_LOCK_ACQUIRE, %rdx)
#endif
ret
Llml_slow:
- test $M_ILOCKED_MSK, LMTX_C_REG32 /* is the interlock held */
- jz Llml_contended /* no, must have been the mutex */
+ test $M_ILOCKED_MSK, %ecx /* is the interlock held */
+ jz Llml_contended /* no, must have been the mutex */
- cmp $(MUTEX_DESTROYED), LMTX_C_REG32 /* check to see if its marked destroyed */
+ cmp $(MUTEX_DESTROYED), %ecx /* check to see if its marked destroyed */
je lck_mtx_destroyed
- cmp $(MUTEX_IND), LMTX_C_REG32 /* Is this an indirect mutex? */
- jne Llml_loop /* no... must be interlocked */
+ cmp $(MUTEX_IND), %ecx /* Is this an indirect mutex? */
+ jne Llml_loop /* no... must be interlocked */
LMTX_ENTER_EXTENDED
- mov M_STATE(LMTX_REG), LMTX_C_REG32
- test $(M_SPIN_MSK), LMTX_C_REG32
+ mov M_STATE(%rdx), %ecx
+ test $(M_SPIN_MSK), %ecx
jz Llml_loop1
LMTX_UPDATE_MISS /* M_SPIN_MSK was set, so M_ILOCKED_MSK must also be present */
Llml_loop:
PAUSE
- mov M_STATE(LMTX_REG), LMTX_C_REG32
+ mov M_STATE(%rdx), %ecx
Llml_loop1:
- test $(M_ILOCKED_MSK | M_MLOCKED_MSK), LMTX_C_REG32
+ test $(M_ILOCKED_MSK | M_MLOCKED_MSK), %ecx
jz Llml_try
- test $(M_MLOCKED_MSK), LMTX_C_REG32
- jnz Llml_contended /* mutex owned by someone else, go contend for it */
+ test $(M_MLOCKED_MSK), %ecx
+ jnz Llml_contended /* mutex owned by someone else, go contend for it */
jmp Llml_loop
Llml_busy_disabled:
Llml_contended:
- LMTX_CHK_EXTENDED /* is this an extended mutex */
+ cmp %rdx, %rdi /* is this an extended mutex */
je 0f
LMTX_UPDATE_MISS
0:
LMTX_CALLEXT1(lck_mtx_lock_spinwait_x86)
- test LMTX_RET_REG, LMTX_RET_REG
+ test %rax, %rax
jz Llml_acquired /* acquired mutex, interlock held and preemption disabled */
- cmp $1, LMTX_RET_REG /* check for direct wait status */
+ cmp $1, %rax /* check for direct wait status */
je 2f
- LMTX_CHK_EXTENDED /* is this an extended mutex */
+ cmp %rdx, %rdi /* is this an extended mutex */
je 2f
LMTX_UPDATE_DIRECT_WAIT
2:
- mov M_STATE(LMTX_REG), LMTX_C_REG32
- test $(M_ILOCKED_MSK), LMTX_C_REG32
+ mov M_STATE(%rdx), %ecx
+ test $(M_ILOCKED_MSK), %ecx
jnz 6f
- mov LMTX_C_REG, LMTX_A_REG /* eax contains snapshot for cmpxchgl */
- or $(M_ILOCKED_MSK), LMTX_C_REG32 /* try to take the interlock */
+ mov %rcx, %rax /* eax contains snapshot for cmpxchgl */
+ or $(M_ILOCKED_MSK), %ecx /* try to take the interlock */
PREEMPTION_DISABLE
lock
- cmpxchg LMTX_C_REG32, M_STATE(LMTX_REG) /* atomic compare and exchange */
+ cmpxchg %ecx, M_STATE(%rdx) /* atomic compare and exchange */
jne 5f
- test $(M_MLOCKED_MSK), LMTX_C_REG32 /* we've got the interlock and */
+ test $(M_MLOCKED_MSK), %ecx /* we've got the interlock and */
jnz 3f
- or $(M_MLOCKED_MSK), LMTX_C_REG32 /* the mutex is free... grab it directly */
- mov LMTX_C_REG32, M_STATE(LMTX_REG)
+ or $(M_MLOCKED_MSK), %ecx /* the mutex is free... grab it directly */
+ mov %ecx, M_STATE(%rdx)
- mov %gs:CPU_ACTIVE_THREAD, LMTX_A_REG
- mov LMTX_A_REG, M_OWNER(LMTX_REG) /* record owner of mutex */
+ mov %gs:CPU_ACTIVE_THREAD, %rax
+ mov %rax, M_OWNER(%rdx) /* record owner of mutex */
#if MACH_LDEBUG
- test LMTX_A_REG, LMTX_A_REG
+ test %rax, %rax
jz 1f
- incl TH_MUTEX_COUNT(LMTX_A_REG) /* lock statistic */
+ incl TH_MUTEX_COUNT(%rax) /* lock statistic */
1:
#endif /* MACH_LDEBUG */
Llml_acquired:
- testl $(M_WAITERS_MSK), M_STATE(LMTX_REG)
+ testl $(M_WAITERS_MSK), M_STATE(%rdx)
jnz 1f
- mov M_OWNER(LMTX_REG), LMTX_A_REG
- mov TH_WAS_PROMOTED_ON_WAKEUP(LMTX_A_REG), LMTX_A_REG32
- test LMTX_A_REG32, LMTX_A_REG32
+ mov M_OWNER(%rdx), %rax
+ mov TH_WAS_PROMOTED_ON_WAKEUP(%rax), %eax
+ test %eax, %eax
jz Llml_finish
1:
LMTX_CALLEXT1(lck_mtx_lock_acquire_x86)
jmp Llml_finish
3: /* interlock held, mutex busy */
- LMTX_CHK_EXTENDED /* is this an extended mutex */
+ cmp %rdx, %rdi /* is this an extended mutex */
je 4f
LMTX_UPDATE_WAIT
4:
NONLEAF_ENTRY(lck_mtx_try_lock_spin_always)
- LOAD_LMTX_REG(B_ARG0) /* fetch lock pointer */
+ mov %rdi, %rdx /* fetch lock pointer */
jmp Llmts_avoid_check
NONLEAF_ENTRY(lck_mtx_try_lock_spin)
- LOAD_LMTX_REG(B_ARG0) /* fetch lock pointer */
+ mov %rdi, %rdx /* fetch lock pointer */
Llmts_avoid_check:
- mov M_STATE(LMTX_REG), LMTX_C_REG32
- test $(M_ILOCKED_MSK | M_MLOCKED_MSK), LMTX_C_REG32 /* is the interlock or mutex held */
+ mov M_STATE(%rdx), %ecx
+ test $(M_ILOCKED_MSK | M_MLOCKED_MSK), %ecx /* is the interlock or mutex held */
jnz Llmts_slow
-Llmts_try: /* no - can't be INDIRECT, DESTROYED or locked */
- mov LMTX_C_REG, LMTX_A_REG /* eax contains snapshot for cmpxchgl */
- or $(M_ILOCKED_MSK | M_SPIN_MSK), LMTX_C_REG
+Llmts_try: /* no - can't be INDIRECT, DESTROYED or locked */
+ mov %rcx, %rax /* eax contains snapshot for cmpxchgl */
+ or $(M_ILOCKED_MSK | M_SPIN_MSK), %rcx
PREEMPTION_DISABLE
lock
- cmpxchg LMTX_C_REG32, M_STATE(LMTX_REG) /* atomic compare and exchange */
+ cmpxchg %ecx, M_STATE(%rdx) /* atomic compare and exchange */
jne Llmts_busy_disabled
- mov %gs:CPU_ACTIVE_THREAD, LMTX_A_REG
- mov LMTX_A_REG, M_OWNER(LMTX_REG) /* record owner of mutex */
+ mov %gs:CPU_ACTIVE_THREAD, %rax
+ mov %rax, M_OWNER(%rdx) /* record owner of mutex */
#if MACH_LDEBUG
- test LMTX_A_REG, LMTX_A_REG
+ test %rax, %rax
jz 1f
- incl TH_MUTEX_COUNT(LMTX_A_REG) /* lock statistic */
+ incl TH_MUTEX_COUNT(%rax) /* lock statistic */
1:
#endif /* MACH_LDEBUG */
- LMTX_CHK_EXTENDED_EXIT
leave
#if CONFIG_DTRACE
- mov $1, LMTX_RET_REG /* return success */
+ mov $1, %rax /* return success */
LOCKSTAT_LABEL(_lck_mtx_try_lock_spin_lockstat_patch_point)
ret
- /* inherit lock pointer in LMTX_REG above */
- LOCKSTAT_RECORD(LS_LCK_MTX_TRY_SPIN_LOCK_ACQUIRE, LMTX_REG)
+ /* inherit lock pointer in %rdx above */
+ LOCKSTAT_RECORD(LS_LCK_MTX_TRY_SPIN_LOCK_ACQUIRE, %rdx)
#endif
- mov $1, LMTX_RET_REG /* return success */
+ mov $1, %rax /* return success */
ret
Llmts_slow:
- test $(M_ILOCKED_MSK), LMTX_C_REG32 /* is the interlock held */
+ test $(M_ILOCKED_MSK), %ecx /* is the interlock held */
jz Llmts_fail /* no, must be held as a mutex */
- cmp $(MUTEX_DESTROYED), LMTX_C_REG32 /* check to see if its marked destroyed */
+ cmp $(MUTEX_DESTROYED), %ecx /* check to see if its marked destroyed */
je lck_mtx_destroyed
- cmp $(MUTEX_IND), LMTX_C_REG32 /* Is this an indirect mutex? */
+ cmp $(MUTEX_IND), %ecx /* Is this an indirect mutex? */
jne Llmts_loop1
LMTX_ENTER_EXTENDED
Llmts_loop:
PAUSE
- mov M_STATE(LMTX_REG), LMTX_C_REG32
+ mov M_STATE(%rdx), %ecx
Llmts_loop1:
- test $(M_MLOCKED_MSK | M_SPIN_MSK), LMTX_C_REG32
+ test $(M_MLOCKED_MSK | M_SPIN_MSK), %ecx
jnz Llmts_fail
- test $(M_ILOCKED_MSK), LMTX_C_REG32
+ test $(M_ILOCKED_MSK), %ecx
jz Llmts_try
jmp Llmts_loop
NONLEAF_ENTRY(lck_mtx_try_lock)
- LOAD_LMTX_REG(B_ARG0) /* fetch lock pointer */
+ mov %rdi, %rdx /* fetch lock pointer */
- mov M_STATE(LMTX_REG), LMTX_C_REG32
- test $(M_ILOCKED_MSK | M_MLOCKED_MSK), LMTX_C_REG32 /* is the interlock or mutex held */
+ mov M_STATE(%rdx), %ecx
+ test $(M_ILOCKED_MSK | M_MLOCKED_MSK), %ecx /* is the interlock or mutex held */
jnz Llmt_slow
-Llmt_try: /* no - can't be INDIRECT, DESTROYED or locked */
- mov LMTX_C_REG, LMTX_A_REG /* eax contains snapshot for cmpxchgl */
- or $(M_ILOCKED_MSK | M_MLOCKED_MSK), LMTX_C_REG32
+Llmt_try: /* no - can't be INDIRECT, DESTROYED or locked */
+ mov %rcx, %rax /* eax contains snapshot for cmpxchgl */
+ or $(M_ILOCKED_MSK | M_MLOCKED_MSK), %ecx
PREEMPTION_DISABLE
lock
- cmpxchg LMTX_C_REG32, M_STATE(LMTX_REG) /* atomic compare and exchange */
+ cmpxchg %ecx, M_STATE(%rdx) /* atomic compare and exchange */
jne Llmt_busy_disabled
- mov %gs:CPU_ACTIVE_THREAD, LMTX_A_REG
- mov LMTX_A_REG, M_OWNER(LMTX_REG) /* record owner of mutex */
+ mov %gs:CPU_ACTIVE_THREAD, %rax
+ mov %rax, M_OWNER(%rdx) /* record owner of mutex */
#if MACH_LDEBUG
- test LMTX_A_REG, LMTX_A_REG
+ test %rax, %rax
jz 1f
- incl TH_MUTEX_COUNT(LMTX_A_REG) /* lock statistic */
+ incl TH_MUTEX_COUNT(%rax) /* lock statistic */
1:
#endif /* MACH_LDEBUG */
- LMTX_CHK_EXTENDED_EXIT
-
- test $(M_WAITERS_MSK), LMTX_C_REG32
+ test $(M_WAITERS_MSK), %ecx
jz 0f
LMTX_CALLEXT1(lck_mtx_lock_acquire_x86)
0:
- andl $(~M_ILOCKED_MSK), M_STATE(LMTX_REG)
+ andl $(~M_ILOCKED_MSK), M_STATE(%rdx)
PREEMPTION_ENABLE
leave
#if CONFIG_DTRACE
- mov $1, LMTX_RET_REG /* return success */
+ mov $1, %rax /* return success */
/* Dtrace probe: LS_LCK_MTX_TRY_LOCK_ACQUIRE */
LOCKSTAT_LABEL(_lck_mtx_try_lock_lockstat_patch_point)
ret
- /* inherit lock pointer in LMTX_REG from above */
- LOCKSTAT_RECORD(LS_LCK_MTX_TRY_LOCK_ACQUIRE, LMTX_REG)
+ /* inherit lock pointer in %rdx from above */
+ LOCKSTAT_RECORD(LS_LCK_MTX_TRY_LOCK_ACQUIRE, %rdx)
#endif
- mov $1, LMTX_RET_REG /* return success */
+ mov $1, %rax /* return success */
ret
Llmt_slow:
- test $(M_ILOCKED_MSK), LMTX_C_REG32 /* is the interlock held */
+ test $(M_ILOCKED_MSK), %ecx /* is the interlock held */
jz Llmt_fail /* no, must be held as a mutex */
- cmp $(MUTEX_DESTROYED), LMTX_C_REG32 /* check to see if its marked destroyed */
+ cmp $(MUTEX_DESTROYED), %ecx /* check to see if its marked destroyed */
je lck_mtx_destroyed
- cmp $(MUTEX_IND), LMTX_C_REG32 /* Is this an indirect mutex? */
+ cmp $(MUTEX_IND), %ecx /* Is this an indirect mutex? */
jne Llmt_loop
LMTX_ENTER_EXTENDED
Llmt_loop:
PAUSE
- mov M_STATE(LMTX_REG), LMTX_C_REG32
+ mov M_STATE(%rdx), %ecx
Llmt_loop1:
- test $(M_MLOCKED_MSK | M_SPIN_MSK), LMTX_C_REG32
+ test $(M_MLOCKED_MSK | M_SPIN_MSK), %ecx
jnz Llmt_fail
- test $(M_ILOCKED_MSK), LMTX_C_REG32
+ test $(M_ILOCKED_MSK), %ecx
jz Llmt_try
jmp Llmt_loop
Llmt_fail:
Llmts_fail:
- LMTX_CHK_EXTENDED /* is this an extended mutex */
+ cmp %rdx, %rdi /* is this an extended mutex */
je 0f
LMTX_UPDATE_MISS
- LMTX_EXIT_EXTENDED
0:
- xor LMTX_RET_REG, LMTX_RET_REG
+ xor %rax, %rax
NONLEAF_RET
NONLEAF_ENTRY(lck_mtx_convert_spin)
- LOAD_LMTX_REG(B_ARG0) /* fetch lock pointer */
+ mov %rdi, %rdx /* fetch lock pointer */
- mov M_STATE(LMTX_REG), LMTX_C_REG32
- cmp $(MUTEX_IND), LMTX_C_REG32 /* Is this an indirect mutex? */
+ mov M_STATE(%rdx), %ecx
+ cmp $(MUTEX_IND), %ecx /* Is this an indirect mutex? */
jne 0f
- mov M_PTR(LMTX_REG), LMTX_REG /* If so, take indirection */
- mov M_STATE(LMTX_REG), LMTX_C_REG32
+ mov M_PTR(%rdx), %rdx /* If so, take indirection */
+ mov M_STATE(%rdx), %ecx
0:
- test $(M_MLOCKED_MSK), LMTX_C_REG32 /* already owned as a mutex, just return */
+ test $(M_MLOCKED_MSK), %ecx /* already owned as a mutex, just return */
jnz 2f
- test $(M_WAITERS_MSK), LMTX_C_REG32 /* are there any waiters? */
+ test $(M_WAITERS_MSK), %ecx /* are there any waiters? */
jz 1f
LMTX_CALLEXT1(lck_mtx_lock_acquire_x86)
- mov M_STATE(LMTX_REG), LMTX_C_REG32
+ mov M_STATE(%rdx), %ecx
1:
- and $(~(M_ILOCKED_MSK | M_SPIN_MSK)), LMTX_C_REG32 /* convert from spin version to mutex */
- or $(M_MLOCKED_MSK), LMTX_C_REG32
- mov LMTX_C_REG32, M_STATE(LMTX_REG) /* since I own the interlock, I don't need an atomic update */
+ and $(~(M_ILOCKED_MSK | M_SPIN_MSK)), %ecx /* convert from spin version to mutex */
+ or $(M_MLOCKED_MSK), %ecx
+ mov %ecx, M_STATE(%rdx) /* since I own the interlock, I don't need an atomic update */
PREEMPTION_ENABLE
2:
NONLEAF_ENTRY(lck_mtx_unlock)
- LOAD_LMTX_REG(B_ARG0) /* fetch lock pointer */
+ mov %rdi, %rdx /* fetch lock pointer */
Llmu_entry:
- mov M_STATE(LMTX_REG), LMTX_C_REG32
+ mov M_STATE(%rdx), %ecx
Llmu_prim:
- cmp $(MUTEX_IND), LMTX_C_REG32 /* Is this an indirect mutex? */
+ cmp $(MUTEX_IND), %ecx /* Is this an indirect mutex? */
je Llmu_ext
Llmu_chktype:
- test $(M_MLOCKED_MSK), LMTX_C_REG32 /* check for full mutex */
+ test $(M_MLOCKED_MSK), %ecx /* check for full mutex */
jz Llmu_unlock
Llmu_mutex:
- test $(M_ILOCKED_MSK), LMTX_C_REG /* have to wait for interlock to clear */
+ test $(M_ILOCKED_MSK), %rcx /* have to wait for interlock to clear */
jnz Llmu_busy
- mov LMTX_C_REG, LMTX_A_REG /* eax contains snapshot for cmpxchgl */
- and $(~M_MLOCKED_MSK), LMTX_C_REG32 /* drop mutex */
- or $(M_ILOCKED_MSK), LMTX_C_REG32 /* pick up interlock */
+ mov %rcx, %rax /* eax contains snapshot for cmpxchgl */
+ and $(~M_MLOCKED_MSK), %ecx /* drop mutex */
+ or $(M_ILOCKED_MSK), %ecx /* pick up interlock */
PREEMPTION_DISABLE
lock
- cmpxchg LMTX_C_REG32, M_STATE(LMTX_REG) /* atomic compare and exchange */
- jne Llmu_busy_disabled /* branch on failure to spin loop */
+ cmpxchg %ecx, M_STATE(%rdx) /* atomic compare and exchange */
+ jne Llmu_busy_disabled /* branch on failure to spin loop */
Llmu_unlock:
- xor LMTX_A_REG, LMTX_A_REG
- mov LMTX_A_REG, M_OWNER(LMTX_REG)
- mov LMTX_C_REG, LMTX_A_REG /* keep original state in %ecx for later evaluation */
- and $(~(M_ILOCKED_MSK | M_SPIN_MSK | M_PROMOTED_MSK)), LMTX_A_REG
+ xor %rax, %rax
+ mov %rax, M_OWNER(%rdx)
+ mov %rcx, %rax /* keep original state in %ecx for later evaluation */
+ and $(~(M_ILOCKED_MSK | M_SPIN_MSK | M_PROMOTED_MSK)), %rax
- test $(M_WAITERS_MSK), LMTX_A_REG32
+ test $(M_WAITERS_MSK), %eax
jz 2f
- dec LMTX_A_REG32 /* decrement waiter count */
+ dec %eax /* decrement waiter count */
2:
- mov LMTX_A_REG32, M_STATE(LMTX_REG) /* since I own the interlock, I don't need an atomic update */
+ mov %eax, M_STATE(%rdx) /* since I own the interlock, I don't need an atomic update */
#if MACH_LDEBUG
/* perform lock statistics after drop to prevent delay */
- mov %gs:CPU_ACTIVE_THREAD, LMTX_A_REG
- test LMTX_A_REG, LMTX_A_REG
+ mov %gs:CPU_ACTIVE_THREAD, %rax
+ test %rax, %rax
jz 1f
- decl TH_MUTEX_COUNT(LMTX_A_REG) /* lock statistic */
+ decl TH_MUTEX_COUNT(%rax) /* lock statistic */
1:
#endif /* MACH_LDEBUG */
- test $(M_PROMOTED_MSK | M_WAITERS_MSK), LMTX_C_REG32
+ test $(M_PROMOTED_MSK | M_WAITERS_MSK), %ecx
jz 3f
- LMTX_CALLEXT2(lck_mtx_unlock_wakeup_x86, LMTX_C_REG)
+ LMTX_CALLEXT2(lck_mtx_unlock_wakeup_x86, %rcx)
3:
PREEMPTION_ENABLE
- LMTX_CHK_EXTENDED
+ cmp %rdx, %rdi
jne 4f
leave
/* Dtrace: LS_LCK_MTX_UNLOCK_RELEASE */
LOCKSTAT_LABEL(_lck_mtx_unlock_lockstat_patch_point)
ret
- /* inherit lock pointer in LMTX_REG from above */
- LOCKSTAT_RECORD(LS_LCK_MTX_UNLOCK_RELEASE, LMTX_REG)
+ /* inherit lock pointer in %rdx from above */
+ LOCKSTAT_RECORD(LS_LCK_MTX_UNLOCK_RELEASE, %rdx)
#endif
ret
4:
/* Dtrace: LS_LCK_MTX_EXT_UNLOCK_RELEASE */
LOCKSTAT_LABEL(_lck_mtx_ext_unlock_lockstat_patch_point)
ret
- /* inherit lock pointer in LMTX_REG from above */
- LOCKSTAT_RECORD(LS_LCK_MTX_EXT_UNLOCK_RELEASE, LMTX_REG)
+ /* inherit lock pointer in %rdx from above */
+ LOCKSTAT_RECORD(LS_LCK_MTX_EXT_UNLOCK_RELEASE, %rdx)
#endif
ret
PREEMPTION_ENABLE
Llmu_busy:
PAUSE
- mov M_STATE(LMTX_REG), LMTX_C_REG32
+ mov M_STATE(%rdx), %ecx
jmp Llmu_mutex
Llmu_ext:
- mov M_PTR(LMTX_REG), LMTX_REG
- mov M_OWNER(LMTX_REG), LMTX_A_REG
- mov %gs:CPU_ACTIVE_THREAD, LMTX_C_REG
- CHECK_UNLOCK(LMTX_C_REG, LMTX_A_REG)
- mov M_STATE(LMTX_REG), LMTX_C_REG32
+ mov M_PTR(%rdx), %rdx
+ mov M_OWNER(%rdx), %rax
+ mov %gs:CPU_ACTIVE_THREAD, %rcx
+ CHECK_UNLOCK(%rcx, %rax)
+ mov M_STATE(%rdx), %ecx
jmp Llmu_chktype
-LEAF_ENTRY(lck_mtx_ilk_unlock)
- LOAD_LMTX_REG(L_ARG0) /* fetch lock pointer - no indirection here */
+LEAF_ENTRY(lck_mtx_ilk_try_lock)
+ mov %rdi, %rdx /* fetch lock pointer - no indirection here */
+
+ mov M_STATE(%rdx), %ecx
- andl $(~M_ILOCKED_MSK), M_STATE(LMTX_REG)
+ test $(M_ILOCKED_MSK), %ecx /* can't have the interlock yet */
+ jnz 3f
- PREEMPTION_ENABLE /* need to re-enable preemption */
+ mov %rcx, %rax /* eax contains snapshot for cmpxchgl */
+ or $(M_ILOCKED_MSK), %ecx
+ PREEMPTION_DISABLE
+ lock
+ cmpxchg %ecx, M_STATE(%rdx) /* atomic compare and exchange */
+ jne 2f /* return failure after re-enabling preemption */
+
+ mov $1, %rax /* return success with preemption disabled */
+ LEAF_RET
+2:
+ PREEMPTION_ENABLE /* need to re-enable preemption */
+3:
+ xor %rax, %rax /* return failure */
LEAF_RET
+LEAF_ENTRY(lck_mtx_ilk_unlock)
+ mov %rdi, %rdx /* fetch lock pointer - no indirection here */
+
+ andl $(~M_ILOCKED_MSK), M_STATE(%rdx)
+
+ PREEMPTION_ENABLE /* need to re-enable preemption */
+
+ LEAF_RET
+
LEAF_ENTRY(lck_mtx_lock_grab_mutex)
- LOAD_LMTX_REG(L_ARG0) /* fetch lock pointer - no indirection here */
+ mov %rdi, %rdx /* fetch lock pointer - no indirection here */
- mov M_STATE(LMTX_REG), LMTX_C_REG32
+ mov M_STATE(%rdx), %ecx
- test $(M_ILOCKED_MSK | M_MLOCKED_MSK), LMTX_C_REG32 /* can't have the mutex yet */
+ test $(M_ILOCKED_MSK | M_MLOCKED_MSK), %ecx /* can't have the mutex yet */
jnz 3f
- mov LMTX_C_REG, LMTX_A_REG /* eax contains snapshot for cmpxchgl */
- or $(M_ILOCKED_MSK | M_MLOCKED_MSK), LMTX_C_REG32
+ mov %rcx, %rax /* eax contains snapshot for cmpxchgl */
+ or $(M_ILOCKED_MSK | M_MLOCKED_MSK), %ecx
PREEMPTION_DISABLE
lock
- cmpxchg LMTX_C_REG32, M_STATE(LMTX_REG) /* atomic compare and exchange */
+ cmpxchg %ecx, M_STATE(%rdx) /* atomic compare and exchange */
jne 2f /* branch on failure to spin loop */
- mov %gs:CPU_ACTIVE_THREAD, LMTX_A_REG
- mov LMTX_A_REG, M_OWNER(LMTX_REG) /* record owner of mutex */
+ mov %gs:CPU_ACTIVE_THREAD, %rax
+ mov %rax, M_OWNER(%rdx) /* record owner of mutex */
#if MACH_LDEBUG
- test LMTX_A_REG, LMTX_A_REG
+ test %rax, %rax
jz 1f
- incl TH_MUTEX_COUNT(LMTX_A_REG) /* lock statistic */
+ incl TH_MUTEX_COUNT(%rax) /* lock statistic */
1:
#endif /* MACH_LDEBUG */
- mov $1, LMTX_RET_REG /* return success */
+ mov $1, %rax /* return success */
LEAF_RET
2:
PREEMPTION_ENABLE
3:
- xor LMTX_RET_REG, LMTX_RET_REG /* return failure */
+ xor %rax, %rax /* return failure */
LEAF_RET
LEAF_ENTRY(lck_mtx_lock_mark_destroyed)
- LOAD_LMTX_REG(L_ARG0)
+ mov %rdi, %rdx
1:
- mov M_STATE(LMTX_REG), LMTX_C_REG32
- cmp $(MUTEX_IND), LMTX_C_REG32 /* Is this an indirect mutex? */
+ mov M_STATE(%rdx), %ecx
+ cmp $(MUTEX_IND), %ecx /* Is this an indirect mutex? */
jne 2f
- movl $(MUTEX_DESTROYED), M_STATE(LMTX_REG) /* convert to destroyed state */
+ movl $(MUTEX_DESTROYED), M_STATE(%rdx) /* convert to destroyed state */
jmp 3f
2:
- test $(M_ILOCKED_MSK), LMTX_C_REG /* have to wait for interlock to clear */
+ test $(M_ILOCKED_MSK), %rcx /* have to wait for interlock to clear */
jnz 5f
PREEMPTION_DISABLE
- mov LMTX_C_REG, LMTX_A_REG /* eax contains snapshot for cmpxchgl */
- or $(M_ILOCKED_MSK), LMTX_C_REG32
+ mov %rcx, %rax /* eax contains snapshot for cmpxchgl */
+ or $(M_ILOCKED_MSK), %ecx
lock
- cmpxchg LMTX_C_REG32, M_STATE(LMTX_REG) /* atomic compare and exchange */
- jne 4f /* branch on failure to spin loop */
- movl $(MUTEX_DESTROYED), M_STATE(LMTX_REG) /* convert to destroyed state */
+ cmpxchg %ecx, M_STATE(%rdx) /* atomic compare and exchange */
+ jne 4f /* branch on failure to spin loop */
+ movl $(MUTEX_DESTROYED), M_STATE(%rdx) /* convert to destroyed state */
PREEMPTION_ENABLE
3:
- LEAF_RET /* return with M_ILOCKED set */
+ LEAF_RET /* return with M_ILOCKED set */
4:
PREEMPTION_ENABLE
5:
.text
-LEAF_ENTRY(_disable_preemption)
-#if MACH_RT
- PREEMPTION_DISABLE
-#endif /* MACH_RT */
- LEAF_RET
-
-LEAF_ENTRY(_enable_preemption)
-#if MACH_RT
-#if MACH_ASSERT
- cmpl $0,%gs:CPU_PREEMPTION_LEVEL
- jg 1f
- movl %gs:CPU_PREEMPTION_LEVEL,%esi
- ALIGN_STACK()
- LOAD_STRING_ARG0(_enable_preemption_less_than_zero)
- CALL_PANIC()
- hlt
- .cstring
-_enable_preemption_less_than_zero:
- .asciz "_enable_preemption: preemption_level(%d) < 0!"
- .text
-1:
-#endif /* MACH_ASSERT */
- PREEMPTION_ENABLE
-#endif /* MACH_RT */
- LEAF_RET
-
-LEAF_ENTRY(_enable_preemption_no_check)
-#if MACH_RT
-#if MACH_ASSERT
- cmpl $0,%gs:CPU_PREEMPTION_LEVEL
- jg 1f
- ALIGN_STACK()
- LOAD_STRING_ARG0(_enable_preemption_no_check_less_than_zero)
- CALL_PANIC()
- hlt
- .cstring
-_enable_preemption_no_check_less_than_zero:
- .asciz "_enable_preemption_no_check: preemption_level <= 0!"
- .text
-1:
-#endif /* MACH_ASSERT */
- _ENABLE_PREEMPTION_NO_CHECK
-#endif /* MACH_RT */
- LEAF_RET
-
-
-LEAF_ENTRY(_mp_disable_preemption)
-#if MACH_RT
- PREEMPTION_DISABLE
-#endif /* MACH_RT */
- LEAF_RET
-
-LEAF_ENTRY(_mp_enable_preemption)
-#if MACH_RT
-#if MACH_ASSERT
- cmpl $0,%gs:CPU_PREEMPTION_LEVEL
- jg 1f
- movl %gs:CPU_PREEMPTION_LEVEL,%esi
- ALIGN_PANIC()
- LOAD_STRING_ARG0(_mp_enable_preemption_less_than_zero)
- CALL_PANIC()
- hlt
- .cstring
-_mp_enable_preemption_less_than_zero:
- .asciz "_mp_enable_preemption: preemption_level (%d) <= 0!"
- .text
-1:
-#endif /* MACH_ASSERT */
- PREEMPTION_ENABLE
-#endif /* MACH_RT */
- LEAF_RET
-
-LEAF_ENTRY(_mp_enable_preemption_no_check)
-#if MACH_RT
-#if MACH_ASSERT
- cmpl $0,%gs:CPU_PREEMPTION_LEVEL
- jg 1f
- ALIGN_STACK()
- LOAD_STRING_ARG0(_mp_enable_preemption_no_check_less_than_zero)
- CALL_PANIC()
- hlt
- .cstring
-_mp_enable_preemption_no_check_less_than_zero:
- .asciz "_mp_enable_preemption_no_check: preemption_level <= 0!"
- .text
-1:
-#endif /* MACH_ASSERT */
- _ENABLE_PREEMPTION_NO_CHECK
-#endif /* MACH_RT */
- LEAF_RET
-
-
-LEAF_ENTRY(i_bit_set)
- lock
- bts %edi,(%rsi)
- LEAF_RET
-
-LEAF_ENTRY(i_bit_clear)
- lock
- btr %edi,(%rsi)
- LEAF_RET
-
-
-LEAF_ENTRY(bit_lock)
-1:
- lock
- bts %edi,(%rsi)
- jb 1b
- LEAF_RET
-
-
-LEAF_ENTRY(bit_lock_try)
- lock
- bts %edi,(%rsi)
- jb bit_lock_failed
- movl $1, %eax
- LEAF_RET
-bit_lock_failed:
- xorl %eax,%eax
- LEAF_RET
-
-LEAF_ENTRY(bit_unlock)
- lock
- btr %edi,(%rsi)
- LEAF_RET
-
-
-/*
- * Atomic primitives, prototyped in kern/simple_lock.h
- */
-LEAF_ENTRY(hw_atomic_add)
-#if MACH_LDEBUG
- test $3, %rdi
- jz 1f
- ud2
-1:
-#endif
- movl %esi, %eax /* Load addend */
- lock xaddl %eax, (%rdi) /* Atomic exchange and add */
- addl %esi, %eax /* Calculate result */
- LEAF_RET
-
-LEAF_ENTRY(hw_atomic_sub)
-#if MACH_LDEBUG
- test $3, %rdi
- jz 1f
- ud2
-1:
-#endif
- negl %esi
- movl %esi, %eax
- lock xaddl %eax, (%rdi) /* Atomic exchange and add */
- addl %esi, %eax /* Calculate result */
- LEAF_RET
-
-LEAF_ENTRY(hw_atomic_or)
-#if MACH_LDEBUG
- test $3, %rdi
- jz 1f
- ud2
-1:
-#endif
- movl (%rdi), %eax
-1:
- movl %esi, %edx /* Load mask */
- orl %eax, %edx
- lock cmpxchgl %edx, (%rdi) /* Atomic CAS */
- jne 1b
- movl %edx, %eax /* Result */
- LEAF_RET
-/*
- * A variant of hw_atomic_or which doesn't return a value.
- * The implementation is thus comparatively more efficient.
- */
-
-LEAF_ENTRY(hw_atomic_or_noret)
-#if MACH_LDEBUG
- test $3, %rdi
- jz 1f
- ud2
-1:
-#endif
- lock
- orl %esi, (%rdi) /* Atomic OR */
- LEAF_RET
-
-
-LEAF_ENTRY(hw_atomic_and)
-#if MACH_LDEBUG
- test $3, %rdi
- jz 1f
- ud2
-1:
-#endif
- movl (%rdi), %eax
-1:
- movl %esi, %edx /* Load mask */
- andl %eax, %edx
- lock cmpxchgl %edx, (%rdi) /* Atomic CAS */
- jne 1b
- movl %edx, %eax /* Result */
- LEAF_RET
-/*
- * A variant of hw_atomic_and which doesn't return a value.
- * The implementation is thus comparatively more efficient.
- */
-
-LEAF_ENTRY(hw_atomic_and_noret)
-#if MACH_LDEBUG
- test $3, %rdi
- jz 1f
- ud2
-1:
-#endif
- lock andl %esi, (%rdi) /* Atomic OR */
- LEAF_RET
-
projects / apple / xnu.git / blobdiff