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Diffstat (limited to 'ANDROID_3.4.5/arch/arm/mm/abort-macro.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/mm/abort-macro.S | 40 |
1 files changed, 0 insertions, 40 deletions
diff --git a/ANDROID_3.4.5/arch/arm/mm/abort-macro.S b/ANDROID_3.4.5/arch/arm/mm/abort-macro.S deleted file mode 100644 index 2cbf68ef..00000000 --- a/ANDROID_3.4.5/arch/arm/mm/abort-macro.S +++ /dev/null @@ -1,40 +0,0 @@ -/* - * 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, fsr, pc, psr, tmp - tst \psr, #PSR_T_BIT - beq not_thumb - ldrh \tmp, [\pc] @ Read aborted Thumb instruction - and \tmp, \tmp, # 0xfe00 @ Mask opcode field - cmp \tmp, # 0x5600 @ Is it ldrsb? - orreq \tmp, \tmp, #1 << 11 @ Set L-bit if yes - tst \tmp, #1 << 11 @ L = 0 -> write - orreq \fsr, \fsr, #1 << 11 @ yes. - b do_DataAbort -not_thumb: - .endm - -/* - * We check for the following instruction encoding for LDRD. - * - * [27:25] == 000 - * [7:4] == 1101 - * [20] == 0 - */ - .macro do_ldrd_abort, tmp, insn - tst \insn, #0x0e100000 @ [27:25,20] == 0 - bne not_ldrd - and \tmp, \insn, #0x000000f0 @ [7:4] == 1101 - cmp \tmp, #0x000000d0 - beq do_DataAbort -not_ldrd: - .endm - |