| /* |
| * The ARM LDRD and Thumb LDRSB instructions use bit 20/11 (ARM/Thumb) |
| * differently than every other instruction, so it is set to 0 (write) |
| * even though the instructions are read instructions. This means that |
| * during an abort the instructions will be treated as a write and the |
| * handler will raise a signal from unwriteable locations if they |
| * fault. We have to specifically check for these instructions |
| * from the abort handlers to treat them properly. |
| * |
| */ |
| |
| .macro do_thumb_abort |
| tst r3, #PSR_T_BIT |
| beq not_thumb |
| ldrh r3, [r2] @ Read aborted Thumb instruction |
| and r3, r3, # 0xfe00 @ Mask opcode field |
| cmp r3, # 0x5600 @ Is it ldrsb? |
| orreq r3, r3, #1 << 11 @ Set L-bit if yes |
| tst r3, #1 << 11 @ L = 0 -> write |
| orreq r1, r1, #1 << 11 @ yes. |
| mov pc, lr |
| not_thumb: |
| .endm |
| |
| /* |
| * We check for the following insturction encoding for LDRD. |
| * |
| * [27:25] == 0 |
| * [7:4] == 1101 |
| * [20] == 0 |
| */ |
| .macro do_ldrd_abort |
| tst r3, #0x0e000000 @ [27:25] == 0 |
| bne not_ldrd |
| and r2, r3, #0x000000f0 @ [7:4] == 1101 |
| cmp r2, #0x000000d0 |
| bne not_ldrd |
| tst r3, #1 << 20 @ [20] == 0 |
| moveq pc, lr |
| not_ldrd: |
| .endm |
| |
