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This permits an AArch64AbsLongThunk to be used in an environment where unaligned accesses are disabled. The AArch64AbsLongThunk does a load of an 8-byte address. When unaligned accesses are disabled this address must be 8-byte aligned. The vast majority of AArch64 systems will have unaligned accesses enabled in userspace. However, after a reset, before the MMU has been enabled, all memory accesses are to "device" memory, which requires aligned accesses. In systems with multi-stage boot loaders a thunk may be required to a later stage before the MMU has been enabled. As we only want to increase the alignment when the ldr is used we delay the increase in thunk alignment until we know we are going to write an ldr. We also need to account for the ThunkSection alignment increase when this happens. In some of the test updates, particularly those with shared CHECK lines with position independent thunks it was easier to ensure that the thunks started at an 8-byte aligned address in all cases.
35 lines
1.1 KiB
ArmAsm
35 lines
1.1 KiB
ArmAsm
// REQUIRES: aarch64
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// RUN: llvm-mc -filetype=obj -triple=aarch64 %s -o %t.o
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// RUN: echo 'SECTIONS { \
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// RUN: .text.1 0x10000 : { *(.text.1) } \
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// RUN: .text.2 0x200000000 : AT(0x20000) { *(.text.2) } \
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// RUN: } ' > %t.script
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// RUN: ld.lld --script %t.script %t.o -o %t
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// RUN: llvm-objdump -d --no-show-raw-insn --print-imm-hex %t | FileCheck %s
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// The word should be an offset to the range extension thunk.
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// CHECK-LABEL: <_start>:
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// CHECK-NEXT: 10000: 08 00 00 00 .word 0x00000008
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// The thunk redirects to the address of callee.
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// CHECK-LABEL: <__AArch64AbsLongThunk_callee>:
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// CHECK-NEXT: 10008: ldr x16, 0x10010 <__AArch64AbsLongThunk_callee+0x8>
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// CHECK-NEXT: br x16
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// CHECK-NEXT: 00 00 00 00 .word 0x00000000
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// CHECK-NEXT: 02 00 00 00 .word 0x00000002
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// CHECK-LABEL: <callee>:
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// CHECK-NEXT: 200000000: ret
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.section .text.1, "ax", %progbits
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.global _start
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.type _start, %function
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_start:
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.word callee@PLT - .
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.section .text.2, "ax", %progbits
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.global callee
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.type callee, %function
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callee:
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ret
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