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llvm-project/lld/test/ELF/arm-thunk-linkerscript-orph...

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[ELF] Introduce range extension thunks for ARM This change adds initial support for range extension thunks. All thunks must be created within the first pass so some corner cases are not supported. A follow up patch will add support for multiple passes. With this change the existing tests arm-branch-error.s and arm-thumb-branch-error.s now no longer fail with an out of range branch. These have been renamed and tests added for the range extension thunk. Differential Revision: https://reviews.llvm.org/D34691 llvm-svn: 316752
2017-10-27 17:04:11 +08:00
// REQUIRES: arm
[ELF] Add support for Armv5 and Armv6 compatible Thunks Older Arm architectures do not support the MOVT and MOVW instructions so we must use an alternative sequence of instructions to transfer control to the destination. Assuming at least Armv5 this patch adds support for Thunks that load or add to the program counter. Note that there are no Armv5 Thumb Thunks as there is no Thumb branch instruction in Armv5 that supports Thunks. These thunks will not work for Armv4t (arm7tdmi) as this architecture cannot change state from using the LDR or ADD instruction. Differential Revision: https://reviews.llvm.org/D50077 llvm-svn: 340160
2018-08-20 17:37:50 +08:00
// RUN: llvm-mc -arm-add-build-attributes -filetype=obj -triple=thumbv7a-none-linux-gnueabi %s -o %t
[ELF] Introduce range extension thunks for ARM This change adds initial support for range extension thunks. All thunks must be created within the first pass so some corner cases are not supported. A follow up patch will add support for multiple passes. With this change the existing tests arm-branch-error.s and arm-thumb-branch-error.s now no longer fail with an out of range branch. These have been renamed and tests added for the range extension thunk. Differential Revision: https://reviews.llvm.org/D34691 llvm-svn: 316752
2017-10-27 17:04:11 +08:00
// RUN: echo "SECTIONS { \
// RUN: .text_low 0x100000 : { *(.text_low) } \
// RUN: .text_high 0x2000000 : { *(.text_high) } \
// RUN: .data : { *(.data) } \
// RUN: }" > %t.script
// RUN: ld.lld --script %t.script %t -o %t2 2>&1
// RUN: llvm-objdump -d -triple=thumbv7a-none-linux-gnueabi %t2 | FileCheck %s
.syntax unified
.section .text_low, "ax", %progbits
.thumb
.globl _start
_start: bx lr
.globl low_target
.type low_target, %function
low_target:
bl high_target
bl orphan_target
// CHECK: Disassembly of section .text_low:
// CHECK-NEXT: _start:
// CHECK-NEXT: 100000: 70 47 bx lr
// CHECK: low_target:
// CHECK-NEXT: 100002: 00 f0 03 f8 bl #6
// CHECK-NEXT: 100006: 00 f0 06 f8 bl #12
// CHECK: __Thumbv7ABSLongThunk_high_target:
// CHECK-NEXT: 10000c: 40 f2 01 0c movw r12, #1
// CHECK-NEXT: 100010: c0 f2 00 2c movt r12, #512
// CHECK-NEXT: 100014: 60 47 bx r12
// CHECK: __Thumbv7ABSLongThunk_orphan_target:
// CHECK-NEXT: 100016: 40 f2 15 0c movw r12, #21
// CHECK-NEXT: 10001a: c0 f2 00 2c movt r12, #512
// CHECK-NEXT: 10001e: 60 47 bx r12
.section .text_high, "ax", %progbits
.thumb
.globl high_target
.type high_target, %function
high_target:
bl low_target
bl orphan_target
// CHECK: Disassembly of section .text_high:
// CHECK-NEXT: high_target:
// CHECK-NEXT: 2000000: 00 f0 02 f8 bl #4
// CHECK-NEXT: 2000004: 00 f0 06 f8 bl #12
// CHECK: __Thumbv7ABSLongThunk_low_target:
// CHECK-NEXT: 2000008: 40 f2 03 0c movw r12, #3
// CHECK-NEXT: 200000c: c0 f2 10 0c movt r12, #16
// CHECK-NEXT: 2000010: 60 47 bx r12
.section orphan, "ax", %progbits
.thumb
.globl orphan_target
.type orphan_target, %function
orphan_target:
bl low_target
bl high_target
// CHECK: Disassembly of section orphan:
// CHECK-NEXT: orphan_target:
// CHECK-NEXT: 2000014: ff f7 f8 ff bl #-16
// CHECK-NEXT: 2000018: ff f7 f2 ff bl #-28
.data
.word 10