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/*-
* Copyright (c) 2014 Andrew Turner
* Copyright (c) 2014-2015 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by Andrew Turner
* under sponsorship from the FreeBSD Foundation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
#include <machine/setjmp.h>
#include <machine/param.h>
#include "assym.s"
/*
* One of the fu* or su* functions failed, return -1.
*/
ENTRY(fsu_fault)
SET_FAULT_HANDLER(xzr, x1) /* Reset the handler function */
fsu_fault_nopcb:
mov x0, #-1
ret
END(fsu_fault)
/*
* int casueword32(volatile uint32_t *, uint32_t, uint32_t *, uint32_t)
*/
ENTRY(casueword32)
ldr x4, =(VM_MAXUSER_ADDRESS-3)
cmp x0, x4
b.cs fsu_fault_nopcb
adr x6, fsu_fault /* Load the fault handler */
SET_FAULT_HANDLER(x6, x4) /* And set it */
1: ldxr w4, [x0] /* Load-exclusive the data */
cmp w4, w1 /* Compare */
b.ne 2f /* Not equal, exit */
stxr w5, w3, [x0] /* Store the new data */
cbnz w5, 1b /* Retry on failure */
2: SET_FAULT_HANDLER(xzr, x5) /* Reset the fault handler */
str w4, [x2] /* Store the read data */
mov x0, #0 /* Success */
ret /* Return */
END(casueword32)
/*
* int casueword(volatile u_long *, u_long, u_long *, u_long)
*/
ENTRY(casueword)
ldr x4, =(VM_MAXUSER_ADDRESS-7)
cmp x0, x4
b.cs fsu_fault_nopcb
adr x6, fsu_fault /* Load the fault handler */
SET_FAULT_HANDLER(x6, x4) /* And set it */
1: ldxr x4, [x0] /* Load-exclusive the data */
cmp x4, x1 /* Compare */
b.ne 2f /* Not equal, exit */
stxr w5, x3, [x0] /* Store the new data */
cbnz w5, 1b /* Retry on failure */
2: SET_FAULT_HANDLER(xzr, x5) /* Reset the fault handler */
str x4, [x2] /* Store the read data */
mov x0, #0 /* Success */
ret /* Return */
END(casueword)
/*
* int fubyte(volatile const void *)
*/
ENTRY(fubyte)
ldr x1, =VM_MAXUSER_ADDRESS
cmp x0, x1
b.cs fsu_fault_nopcb
adr x6, fsu_fault /* Load the fault handler */
SET_FAULT_HANDLER(x6, x1) /* And set it */
ldrb w0, [x0] /* Try loading the data */
SET_FAULT_HANDLER(xzr, x1) /* Reset the fault handler */
ret /* Return */
END(fubyte)
/*
* int fuword(volatile const void *)
*/
ENTRY(fuword16)
ldr x1, =(VM_MAXUSER_ADDRESS-1)
cmp x0, x1
b.cs fsu_fault_nopcb
adr x6, fsu_fault /* Load the fault handler */
SET_FAULT_HANDLER(x6, x1) /* And set it */
ldrh w0, [x0] /* Try loading the data */
SET_FAULT_HANDLER(xzr, x1) /* Reset the fault handler */
ret /* Return */
END(fuword16)
/*
* int32_t fueword32(volatile const void *, int32_t *)
*/
ENTRY(fueword32)
ldr x2, =(VM_MAXUSER_ADDRESS-3)
cmp x0, x2
b.cs fsu_fault_nopcb
adr x6, fsu_fault /* Load the fault handler */
SET_FAULT_HANDLER(x6, x2) /* And set it */
ldr w0, [x0] /* Try loading the data */
SET_FAULT_HANDLER(xzr, x2) /* Reset the fault handler */
str w0, [x1] /* Save the data in kernel space */
mov w0, #0 /* Success */
ret /* Return */
END(fueword32)
/*
* long fueword(volatile const void *, int64_t *)
* int64_t fueword64(volatile const void *, int64_t *)
*/
ENTRY(fueword)
EENTRY(fueword64)
ldr x2, =(VM_MAXUSER_ADDRESS-7)
cmp x0, x2
b.cs fsu_fault_nopcb
adr x6, fsu_fault /* Load the fault handler */
SET_FAULT_HANDLER(x6, x2) /* And set it */
ldr x0, [x0] /* Try loading the data */
SET_FAULT_HANDLER(xzr, x2) /* Reset the fault handler */
str x0, [x1] /* Save the data in kernel space */
mov x0, #0 /* Success */
ret /* Return */
EEND(fueword64)
END(fueword)
/*
* int subyte(volatile void *, int)
*/
ENTRY(subyte)
ldr x2, =VM_MAXUSER_ADDRESS
cmp x0, x2
b.cs fsu_fault_nopcb
adr x6, fsu_fault /* Load the fault handler */
SET_FAULT_HANDLER(x6, x2) /* And set it */
strb w1, [x0] /* Try storing the data */
SET_FAULT_HANDLER(xzr, x2) /* Reset the fault handler */
mov x0, #0 /* Success */
ret /* Return */
END(subyte)
/*
* int suword16(volatile void *, int)
*/
ENTRY(suword16)
ldr x2, =(VM_MAXUSER_ADDRESS-1)
cmp x0, x2
b.cs fsu_fault_nopcb
adr x6, fsu_fault /* Load the fault handler */
SET_FAULT_HANDLER(x6, x2) /* And set it */
strh w1, [x0] /* Try storing the data */
SET_FAULT_HANDLER(xzr, x2) /* Reset the fault handler */
mov x0, #0 /* Success */
ret /* Return */
END(suword16)
/*
* int suword32(volatile void *, int)
*/
ENTRY(suword32)
ldr x2, =(VM_MAXUSER_ADDRESS-3)
cmp x0, x2
b.cs fsu_fault_nopcb
adr x6, fsu_fault /* Load the fault handler */
SET_FAULT_HANDLER(x6, x2) /* And set it */
str w1, [x0] /* Try storing the data */
SET_FAULT_HANDLER(xzr, x2) /* Reset the fault handler */
mov x0, #0 /* Success */
ret /* Return */
END(suword32)
/*
* int suword(volatile void *, long)
*/
ENTRY(suword)
EENTRY(suword64)
ldr x2, =(VM_MAXUSER_ADDRESS-7)
cmp x0, x2
b.cs fsu_fault_nopcb
adr x6, fsu_fault /* Load the fault handler */
SET_FAULT_HANDLER(x6, x2) /* And set it */
str x1, [x0] /* Try storing the data */
SET_FAULT_HANDLER(xzr, x2) /* Reset the fault handler */
mov x0, #0 /* Success */
ret /* Return */
EEND(suword64)
END(suword)
/*
* fuswintr and suswintr are just like fusword and susword except that if
* the page is not in memory or would cause a trap, then we return an error.
* The important thing is to prevent sleep() and switch().
*/
/*
* Special handler so the trap code knows not to sleep.
*/
ENTRY(fsu_intr_fault)
SET_FAULT_HANDLER(xzr, x1) /* Reset the handler function */
mov x0, #-1
ret
END(fsu_fault)
/*
* int fuswintr(void *)
*/
ENTRY(fuswintr)
ldr x1, =(VM_MAXUSER_ADDRESS-3)
cmp x0, x1
b.cs fsu_fault_nopcb
adr x6, fsu_intr_fault /* Load the fault handler */
SET_FAULT_HANDLER(x6, x1) /* And set it */
ldr w0, [x0] /* Try loading the data */
SET_FAULT_HANDLER(xzr, x1) /* Reset the fault handler */
ret /* Return */
END(fuswintr)
/*
* int suswintr(void *base, int word)
*/
ENTRY(suswintr)
ldr x2, =(VM_MAXUSER_ADDRESS-3)
cmp x0, x2
b.cs fsu_fault_nopcb
adr x6, fsu_intr_fault /* Load the fault handler */
SET_FAULT_HANDLER(x6, x2) /* And set it */
str w1, [x0] /* Try storing the data */
SET_FAULT_HANDLER(xzr, x2) /* Reset the fault handler */
mov x0, #0 /* Success */
ret /* Return */
END(suswintr)
ENTRY(setjmp)
/* Store the stack pointer */
mov x8, sp
str x8, [x0], #8
/* Store the general purpose registers and lr */
stp x19, x20, [x0], #16
stp x21, x22, [x0], #16
stp x23, x24, [x0], #16
stp x25, x26, [x0], #16
stp x27, x28, [x0], #16
stp x29, lr, [x0], #16
/* Return value */
mov x0, #0
ret
END(setjmp)
ENTRY(longjmp)
/* Restore the stack pointer */
ldr x8, [x0], #8
mov sp, x8
/* Restore the general purpose registers and lr */
ldp x19, x20, [x0], #16
ldp x21, x22, [x0], #16
ldp x23, x24, [x0], #16
ldp x25, x26, [x0], #16
ldp x27, x28, [x0], #16
ldp x29, lr, [x0], #16
/* Load the return value */
mov x0, x1
ret
END(longjmp)
/*
* pagezero, simple implementation
*/
ENTRY(pagezero_simple)
add x1, x0, #PAGE_SIZE
1:
stp xzr, xzr, [x0], #0x10
stp xzr, xzr, [x0], #0x10
stp xzr, xzr, [x0], #0x10
stp xzr, xzr, [x0], #0x10
cmp x0, x1
b.ne 1b
ret
END(pagezero_simple)
/*
* pagezero, cache assisted
*/
ENTRY(pagezero_cache)
add x1, x0, #PAGE_SIZE
ldr x2, =dczva_line_size
ldr x2, [x2]
1:
dc zva, x0
add x0, x0, x2
cmp x0, x1
b.ne 1b
ret
END(pagezero_cache)
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