Root/arch/arm/mm/abort-ev4t.S

1#include <linux/linkage.h>
2#include <asm/assembler.h>
3#include "abort-macro.S"
4/*
5 * Function: v4t_early_abort
6 *
7 * Params : r2 = address of aborted instruction
8 * : r3 = saved SPSR
9 *
10 * Returns : r0 = address of abort
11 * : r1 = FSR, bit 11 = write
12 * : r2-r8 = corrupted
13 * : r9 = preserved
14 * : sp = pointer to registers
15 *
16 * Purpose : obtain information about current aborted instruction.
17 * Note: we read user space. This means we might cause a data
18 * abort here if the I-TLB and D-TLB aren't seeing the same
19 * picture. Unfortunately, this does happen. We live with it.
20 */
21    .align 5
22ENTRY(v4t_early_abort)
23    mrc p15, 0, r1, c5, c0, 0 @ get FSR
24    mrc p15, 0, r0, c6, c0, 0 @ get FAR
25    do_thumb_abort
26    ldreq r3, [r2] @ read aborted ARM instruction
27    bic r1, r1, #1 << 11 | 1 << 10 @ clear bits 11 and 10 of FSR
28    tst r3, #1 << 20 @ check write
29    orreq r1, r1, #1 << 11
30    mov pc, lr
31

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