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Deduplicate common code in copyin()/copyout() with a macro.

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No functional change intended.

Submitted by:	Mitchell Horne <mhorne063@gmail.com>
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D18850
This commit is contained in:
Mark Johnston 2019-01-21 19:37:12 +00:00
parent d308a8bf0f
commit 45272d0568
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=343274
1 changed files with 28 additions and 27 deletions
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55
sys/riscv/riscv/copyinout.S
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@ -52,60 +52,61 @@ copyio_fault_nopcb:
END(copyio_fault)
/*
* Copies from a kernel to user address
* copycommon - common copy routine
*
* int copyout(const void *kaddr, void *udaddr, size_t len)
* a0 - Source address
* a1 - Destination address
* a2 - Size of copy
*/
ENTRY(copyout)
beqz a2, 2f /* If len == 0 then skip loop */
add a3, a1, a2
li a4, VM_MAXUSER_ADDRESS
bgt a3, a4, copyio_fault_nopcb
.macro copycommon
la a6, copyio_fault /* Get the handler address */
SET_FAULT_HANDLER(a6, a7) /* Set the handler */
ENTER_USER_ACCESS(a7)
1: lb a4, 0(a0) /* Load from kaddr */
1: lb a4, 0(a0) /* Load from src */
addi a0, a0, 1
sb a4, 0(a1) /* Store in uaddr */
sb a4, 0(a1) /* Store in dest */
addi a1, a1, 1
addi a2, a2, -1 /* len-- */
bnez a2, 1b
EXIT_USER_ACCESS(a7)
SET_FAULT_HANDLER(x0, a7) /* Clear the handler */
.endm
2: li a0, 0 /* return 0 */
/*
* Copies from a kernel to user address
*
* int copyout(const void *kaddr, void *udaddr, size_t len)
*/
ENTRY(copyout)
beqz a2, copyout_end /* If len == 0 then skip loop */
add a3, a1, a2
li a4, VM_MAXUSER_ADDRESS
bgt a3, a4, copyio_fault_nopcb
copycommon
copyout_end:
li a0, 0 /* return 0 */
ret
END(copyout)
/*
* Copies from a user to kernel address
*
* int copyin(const void *uaddr, void *kdaddr, size_t len)
* int copyin(const void *uaddr, void *kaddr, size_t len)
*/
ENTRY(copyin)
beqz a2, 2f /* If len == 0 then skip loop */
beqz a2, copyin_end /* If len == 0 then skip loop */
add a3, a0, a2
li a4, VM_MAXUSER_ADDRESS
bgt a3, a4, copyio_fault_nopcb
la a6, copyio_fault /* Get the handler address */
SET_FAULT_HANDLER(a6, a7) /* Set the handler */
ENTER_USER_ACCESS(a7)
copycommon
1: lb a4, 0(a0) /* Load from uaddr */
addi a0, a0, 1
sb a4, 0(a1) /* Store in kaddr */
addi a1, a1, 1
addi a2, a2, -1 /* len-- */
bnez a2, 1b
EXIT_USER_ACCESS(a7)
SET_FAULT_HANDLER(x0, a7) /* Clear the handler */
2: li a0, 0 /* return 0 */
copyin_end:
li a0, 0 /* return 0 */
ret
END(copyin)