Differential D20772 Diff 59471 sys/arm64/arm64/support.S

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sys/arm64/arm64/support.S

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	/*			/*
	* int casueword32(volatile uint32_t , uint32_t, uint32_t , uint32_t)			* int casueword32(volatile uint32_t , uint32_t, uint32_t , uint32_t)
	*/			*/
	ENTRY(casueword32)			ENTRY(casueword32)
	ldr x4, =(VM_MAXUSER_ADDRESS-3)			ldr x4, =(VM_MAXUSER_ADDRESS-3)
	cmp x0, x4			cmp x0, x4
	b.cs fsu_fault_nopcb			b.cs fsu_fault_nopcb
	adr x6, fsu_fault /* Load the fault handler */			adr x6, fsu_fault /* Load the fault handler */
				mov w5, #1
	SET_FAULT_HANDLER(x6, x4) /* And set it */			SET_FAULT_HANDLER(x6, x4) /* And set it */
	ENTER_USER_ACCESS(w6, x4)			ENTER_USER_ACCESS(w6, x4)
	1: ldxr w4, [x0] /* Load-exclusive the data */			1: ldxr w4, [x0] /* Load-exclusive the data */
	cmp w4, w1 /* Compare */			cmp w4, w1 /* Compare */
	b.ne 2f /* Not equal, exit */			b.ne 2f /* Not equal, exit */
	stxr w5, w3, [x0] /* Store the new data */			stxr w5, w3, [x0] /* Store the new data */
	cbnz w5, 1b /* Retry on failure */
	2: EXIT_USER_ACCESS(w6)			2: EXIT_USER_ACCESS(w6)
	SET_FAULT_HANDLER(xzr, x5) /* Reset the fault handler */			SET_FAULT_HANDLER(xzr, x6) /* Reset the fault handler */
	str w4, [x2] /* Store the read data */			str w4, [x2] /* Store the read data */
	mov x0, #0 /* Success */			mov w0, w5 /* Result same as store status */
				jillesUnsubmitted Done Inline Actions Hmm, is the value in w5 overwritten by SET_FAULT_HANDLER? jilles: Hmm, is the value in w5 overwritten by SET_FAULT_HANDLER?
				markjUnsubmitted Done Inline Actions I think w5's contents are uninitialized if we follow the branch to label 2. markj: I think w5's contents are uninitialized if we follow the branch to label 2.
	ret /* Return */			ret /* Return */
	END(casueword32)			END(casueword32)
				andrewUnsubmitted Done Inline Actions Extra newline andrew: Extra newline

	/*			/*
	* int casueword(volatile u_long , u_long, u_long , u_long)			* int casueword(volatile u_long , u_long, u_long , u_long)
	*/			*/
	ENTRY(casueword)			ENTRY(casueword)
	ldr x4, =(VM_MAXUSER_ADDRESS-7)			ldr x4, =(VM_MAXUSER_ADDRESS-7)
	cmp x0, x4			cmp x0, x4
	b.cs fsu_fault_nopcb			b.cs fsu_fault_nopcb
	adr x6, fsu_fault /* Load the fault handler */			adr x6, fsu_fault /* Load the fault handler */
				mov w5, #1
	SET_FAULT_HANDLER(x6, x4) /* And set it */			SET_FAULT_HANDLER(x6, x4) /* And set it */
	ENTER_USER_ACCESS(w6, x4)			ENTER_USER_ACCESS(w6, x4)
	1: ldxr x4, [x0] /* Load-exclusive the data */			1: ldxr x4, [x0] /* Load-exclusive the data */
	cmp x4, x1 /* Compare */			cmp x4, x1 /* Compare */
	b.ne 2f /* Not equal, exit */			b.ne 2f /* Not equal, exit */
	stxr w5, x3, [x0] /* Store the new data */			stxr w5, x3, [x0] /* Store the new data */
	cbnz w5, 1b /* Retry on failure */
	2: EXIT_USER_ACCESS(w6)			2: EXIT_USER_ACCESS(w6)
	SET_FAULT_HANDLER(xzr, x5) /* Reset the fault handler */			SET_FAULT_HANDLER(xzr, x6) /* Reset the fault handler */
	str x4, [x2] /* Store the read data */			str x4, [x2] /* Store the read data */
	mov x0, #0 /* Success */			mov w0, w5 /* Result same as store status */
				markjUnsubmitted Not Done Inline Actions Same here. markj: Same here.
	ret /* Return */			ret /* Return */
	END(casueword)			END(casueword)

	/*			/*
	* int fubyte(volatile const void *)			* int fubyte(volatile const void *)
	*/			*/
	ENTRY(fubyte)			ENTRY(fubyte)
	ldr x1, =VM_MAXUSER_ADDRESS			ldr x1, =VM_MAXUSER_ADDRESS
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