Differential D20772 Diff 59112 sys/amd64/amd64/support.S

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sys/amd64/amd64/support.S

Show First 20 Lines • Show All 805 Lines • ▼ Show 20 Lines	ENTRY(casueword32_nosmap)
cmpq %rax,%rdi /* verify address is valid */		cmpq %rax,%rdi /* verify address is valid */
ja fusufault		ja fusufault

movl %esi,%eax /* old */		movl %esi,%eax /* old */
#ifdef SMP		#ifdef SMP
lock		lock
#endif		#endif
cmpxchgl %ecx,(%rdi) /* new = %ecx */		cmpxchgl %ecx,(%rdi) /* new = %ecx */
		setne %cl

/*		/*
* The old value is in %eax. If the store succeeded it will be the		* The old value is in %eax. If the store succeeded it will be the
* value we expected (old) from before the store, otherwise it will		* value we expected (old) from before the store, otherwise it will
* be the current value. Save %eax into %esi to prepare the return		* be the current value. Save %eax into %esi to prepare the return
* value.		* value.
*/		*/
movl %eax,%esi		movl %eax,%esi
xorl %eax,%eax		xorl %eax,%eax
movq %rax,PCB_ONFAULT(%r8)		movq %rax,PCB_ONFAULT(%r8)

/*		/*
* Access the oldp after the pcb_onfault is cleared, to correctly		* Access the oldp after the pcb_onfault is cleared, to correctly
* catch corrupted pointer.		* catch corrupted pointer.
*/		*/
movl %esi,(%rdx) /* oldp = %rdx */		movl %esi,(%rdx) /* oldp = %rdx */
POP_FRAME_POINTER		POP_FRAME_POINTER
		movzbl %cl, %eax
ret		ret
END(casueword32_nosmap)		END(casueword32_nosmap)

ENTRY(casueword32_smap)		ENTRY(casueword32_smap)
PUSH_FRAME_POINTER		PUSH_FRAME_POINTER
movq PCPU(CURPCB),%r8		movq PCPU(CURPCB),%r8
movq $fusufault,PCB_ONFAULT(%r8)		movq $fusufault,PCB_ONFAULT(%r8)

movq $VM_MAXUSER_ADDRESS-4,%rax		movq $VM_MAXUSER_ADDRESS-4,%rax
cmpq %rax,%rdi /* verify address is valid */		cmpq %rax,%rdi /* verify address is valid */
ja fusufault		ja fusufault

movl %esi,%eax /* old */		movl %esi,%eax /* old */
stac		stac
#ifdef SMP		#ifdef SMP
lock		lock
#endif		#endif
cmpxchgl %ecx,(%rdi) /* new = %ecx */		cmpxchgl %ecx,(%rdi) /* new = %ecx */
clac		clac
		setne %cl

/*		/*
* The old value is in %eax. If the store succeeded it will be the		* The old value is in %eax. If the store succeeded it will be the
* value we expected (old) from before the store, otherwise it will		* value we expected (old) from before the store, otherwise it will
* be the current value. Save %eax into %esi to prepare the return		* be the current value. Save %eax into %esi to prepare the return
* value.		* value.
*/		*/
movl %eax,%esi		movl %eax,%esi
xorl %eax,%eax		xorl %eax,%eax
movq %rax,PCB_ONFAULT(%r8)		movq %rax,PCB_ONFAULT(%r8)

/*		/*
* Access the oldp after the pcb_onfault is cleared, to correctly		* Access the oldp after the pcb_onfault is cleared, to correctly
* catch corrupted pointer.		* catch corrupted pointer.
*/		*/
movl %esi,(%rdx) /* oldp = %rdx */		movl %esi,(%rdx) /* oldp = %rdx */
POP_FRAME_POINTER		POP_FRAME_POINTER
		movzbl %cl, %eax
ret		ret
END(casueword32_smap)		END(casueword32_smap)

/*		/*
* casueword. Compare and set user long. Returns -1 on fault,		* casueword. Compare and set user long. Returns -1 on fault,
* 0 if access was successful. Old value is written to *oldp.		* 0 if access was successful. Old value is written to *oldp.
* dst = %rdi, old = %rsi, oldp = %rdx, new = %rcx		* dst = %rdi, old = %rsi, oldp = %rdx, new = %rcx
*/		*/
ENTRY(casueword_nosmap)		ENTRY(casueword_nosmap)
PUSH_FRAME_POINTER		PUSH_FRAME_POINTER
movq PCPU(CURPCB),%r8		movq PCPU(CURPCB),%r8
movq $fusufault,PCB_ONFAULT(%r8)		movq $fusufault,PCB_ONFAULT(%r8)

movq $VM_MAXUSER_ADDRESS-4,%rax		movq $VM_MAXUSER_ADDRESS-4,%rax
cmpq %rax,%rdi /* verify address is valid */		cmpq %rax,%rdi /* verify address is valid */
ja fusufault		ja fusufault

movq %rsi,%rax /* old */		movq %rsi,%rax /* old */
#ifdef SMP		#ifdef SMP
lock		lock
#endif		#endif
cmpxchgq %rcx,(%rdi) /* new = %rcx */		cmpxchgq %rcx,(%rdi) /* new = %rcx */
		setne %cl

/*		/*
* The old value is in %rax. If the store succeeded it will be the		* The old value is in %rax. If the store succeeded it will be the
* value we expected (old) from before the store, otherwise it will		* value we expected (old) from before the store, otherwise it will
* be the current value.		* be the current value.
*/		*/
movq %rax,%rsi		movq %rax,%rsi
xorl %eax,%eax		xorl %eax,%eax
movq %rax,PCB_ONFAULT(%r8)		movq %rax,PCB_ONFAULT(%r8)
movq %rsi,(%rdx)		movq %rsi,(%rdx)
POP_FRAME_POINTER		POP_FRAME_POINTER
		movzbl %cl, %eax
ret		ret
END(casueword_nosmap)		END(casueword_nosmap)

ENTRY(casueword_smap)		ENTRY(casueword_smap)
PUSH_FRAME_POINTER		PUSH_FRAME_POINTER
movq PCPU(CURPCB),%r8		movq PCPU(CURPCB),%r8
movq $fusufault,PCB_ONFAULT(%r8)		movq $fusufault,PCB_ONFAULT(%r8)

movq $VM_MAXUSER_ADDRESS-4,%rax		movq $VM_MAXUSER_ADDRESS-4,%rax
cmpq %rax,%rdi /* verify address is valid */		cmpq %rax,%rdi /* verify address is valid */
ja fusufault		ja fusufault

movq %rsi,%rax /* old */		movq %rsi,%rax /* old */
stac		stac
#ifdef SMP		#ifdef SMP
lock		lock
#endif		#endif
cmpxchgq %rcx,(%rdi) /* new = %rcx */		cmpxchgq %rcx,(%rdi) /* new = %rcx */
clac		clac
		setne %cl

/*		/*
* The old value is in %rax. If the store succeeded it will be the		* The old value is in %rax. If the store succeeded it will be the
* value we expected (old) from before the store, otherwise it will		* value we expected (old) from before the store, otherwise it will
* be the current value.		* be the current value.
*/		*/
movq %rax,%rsi		movq %rax,%rsi
xorl %eax,%eax		xorl %eax,%eax
movq %rax,PCB_ONFAULT(%r8)		movq %rax,PCB_ONFAULT(%r8)
movq %rsi,(%rdx)		movq %rsi,(%rdx)
POP_FRAME_POINTER		POP_FRAME_POINTER
		movzbl %cl, %eax
ret		ret
END(casueword_smap)		END(casueword_smap)

/*		/*
* Fetch (load) a 64-bit word, a 32-bit word, a 16-bit word, or an 8-bit		* Fetch (load) a 64-bit word, a 32-bit word, a 16-bit word, or an 8-bit
* byte from user memory.		* byte from user memory.
* addr = %rdi, valp = %rsi		* addr = %rdi, valp = %rsi
*/		*/
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