mirror of
https://github.com/torvalds/linux.git
synced 2024-11-08 05:01:48 +00:00
3e287bec6f
Re-jig the CPU abort helpers to take the PC/PSR in r4/r5 rather than r2/r3. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
29 lines
872 B
ArmAsm
29 lines
872 B
ArmAsm
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
/*
|
|
* Function: v4_early_abort
|
|
*
|
|
* Params : r4 = aborted context pc
|
|
* : r5 = aborted context psr
|
|
*
|
|
* Returns : r0 = address of abort
|
|
* : r1 = FSR, bit 11 = write
|
|
* : r2-r8 = corrupted
|
|
* : r9 = preserved
|
|
* : sp = pointer to registers
|
|
*
|
|
* Purpose : obtain information about current aborted instruction.
|
|
* Note: we read user space. This means we might cause a data
|
|
* abort here if the I-TLB and D-TLB aren't seeing the same
|
|
* picture. Unfortunately, this does happen. We live with it.
|
|
*/
|
|
.align 5
|
|
ENTRY(v4_early_abort)
|
|
mrc p15, 0, r1, c5, c0, 0 @ get FSR
|
|
mrc p15, 0, r0, c6, c0, 0 @ get FAR
|
|
ldr r3, [r4] @ read aborted ARM instruction
|
|
bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR
|
|
tst r3, #1 << 20 @ L = 1 -> write?
|
|
orreq r1, r1, #1 << 11 @ yes.
|
|
mov pc, lr
|