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[llvm-objdump][ARM] Find ELF file PLT entries for arm, thumb (llvm#130764)
This implements arm, armeb, thumb, thumbeb PLT entries parsing support in ELF for llvm-objdump. Implementation is similar to AArch64MCInstrAnalysis::findPltEntries. PLT entry signatures are based on LLD code for PLT generation (ARM::writePlt). llvm-objdump tests are produced from lld/test/ELF/arm-plt-reloc.s, lld/test/ELF/armv8-thumb-plt-reloc.s.
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‎cross-project-tests/tools/llvm-objdump/ARM/lit.local.cfg

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if "ARM" not in config.targets_to_build:
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config.unsupported = True

‎cross-project-tests/tools/llvm-objdump/ARM/plt.c

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// Test PLT section parsing on arm.
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// REQUIRES: ld.lld
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// RUN: %clang --target=armv6a-none-linux-gnueabi -fuse-ld=lld \
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// RUN: -nostdlib -nostdinc -shared %s -o %t.v6a
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// RUN: llvm-objdump --no-show-raw-insn --no-print-imm-hex \
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// RUN: -d %t.v6a | FileCheck %s --check-prefixes=CHECK,LE
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// Test PLT section parsing on armeb.
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// RUN: %clang --target=armv6aeb-none-linux-gnueabi -fuse-ld=lld \
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// RUN: -nostdlib -nostdinc -shared %s -o %t.v6aeb
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// RUN: llvm-objdump --no-show-raw-insn --no-print-imm-hex \
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// RUN: -d %t.v6aeb | FileCheck %s --check-prefixes=CHECK,BE
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// RUN: obj2yaml %t.v6aeb | FileCheck %s --check-prefixes=NOBE8
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// Test PLT section parsing on armeb with be8.
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// RUN: %clang --target=armv7aeb-none-linux-gnueabi -fuse-ld=lld \
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// RUN: -nostdlib -nostdinc -shared %s -o %t.v7aeb
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// RUN: llvm-objdump --no-show-raw-insn --no-print-imm-hex \
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// RUN: -d %t.v7aeb | FileCheck %s --check-prefixes=CHECK,BE
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// RUN: obj2yaml %t.v7aeb | FileCheck %s --check-prefixes=BE8
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// LE: file format elf32-littlearm
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// BE: file format elf32-bigarm
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// NOBE8-NOT: EF_ARM_BE8
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// BE8: EF_ARM_BE8
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// CHECK: Disassembly of section .text:
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// CHECK-EMPTY:
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// CHECK-NEXT: <_start>:
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// CHECK-NEXT: push {r11, lr}
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// CHECK-NEXT: mov r11, sp
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// CHECK-NEXT: bl {{.*}} <func1@plt>
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// CHECK-NEXT: bl {{.*}} <func2@plt>
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// CHECK-NEXT: bl {{.*}} <func3@plt>
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// CHECK: Disassembly of section .plt:
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// CHECK: <func1@plt>:
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// CHECK-NEXT: add r12, pc, #0, #12
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// CHECK-NEXT: add r12, r12, #32, #20
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// CHECK-NEXT: ldr pc, [r12, #132]!
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// CHECK-NEXT: .word 0xd4d4d4d4
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// CHECK-EMPTY:
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// CHECK-NEXT: <func2@plt>:
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// CHECK-NEXT: add r12, pc, #0, #12
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// CHECK-NEXT: add r12, r12, #32, #20
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// CHECK-NEXT: ldr pc, [r12, #120]!
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// CHECK-NEXT: .word 0xd4d4d4d4
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// CHECK-EMPTY:
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// CHECK-NEXT: <func3@plt>:
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// CHECK-NEXT: add r12, pc, #0, #12
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// CHECK-NEXT: add r12, r12, #32, #20
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// CHECK-NEXT: ldr pc, [r12, #108]!
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// CHECK-NEXT: .word 0xd4d4d4d4
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// Test PLT section parsing on thumb.
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// RUN: %clang --target=thumbv8.1m.main-none-linux-eabi \
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// RUN: -c %s -o %t.v8.o
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// RUN: ld.lld --shared %t.v8.o -o %t.v8
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// RUN: llvm-objdump --no-show-raw-insn --no-print-imm-hex \
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// RUN: -d %t.v8 | FileCheck %s --check-prefixes=THUMB,LE
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// Test PLT section parsing on thumbeb.
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// RUN: %clang --target=thumbebv8.1m.main-none-linux-eabi \
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// RUN: -c %s -o %t.v8eb.o
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// RUN: ld.lld --shared %t.v8eb.o -o %t.v8eb
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// RUN: llvm-objdump --no-show-raw-insn --no-print-imm-hex \
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// RUN: -d %t.v8eb | FileCheck %s --check-prefixes=THUMB,BE
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// RUN: obj2yaml %t.v8eb | FileCheck %s --check-prefixes=NOBE8
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// Test PLT section parsing on thumbeb with be8.
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// RUN: %clang --target=thumbebv8.1m.main-none-linux-eabi \
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// RUN: -c %s -o %t.v8eb.be8.o
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// RUN: ld.lld --shared --be8 %t.v8eb.be8.o -o %t.v8eb.be8
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// RUN: llvm-objdump --no-show-raw-insn --no-print-imm-hex \
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// RUN: -d %t.v8eb.be8 | FileCheck %s --check-prefixes=THUMB,BE
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// RUN: obj2yaml %t.v8eb.be8 | FileCheck %s --check-prefixes=BE8
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// THUMB: Disassembly of section .text:
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// THUMB-EMPTY:
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// THUMB-NEXT: <_start>:
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// THUMB-NEXT: push {r7, lr}
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// THUMB-NEXT: mov r7, sp
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// THUMB-NEXT: bl {{.*}} <func1@plt>
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// THUMB-NEXT: bl {{.*}} <func2@plt>
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// THUMB-NEXT: bl {{.*}} <func3@plt>
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// THUMB: Disassembly of section .plt:
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// THUMB-EMPTY:
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// THUMB: <func1@plt>:
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// THUMB-NEXT: movw r12, #136
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// THUMB-NEXT: movt r12, #2
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// THUMB-NEXT: add r12, pc
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// THUMB-NEXT: ldr.w pc, [r12]
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// THUMB-NEXT: b 0x
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// THUMB-EMPTY:
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// THUMB-NEXT: <func2@plt>:
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// THUMB-NEXT: movw r12, #124
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// THUMB-NEXT: movt r12, #2
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// THUMB-NEXT: add r12, pc
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// THUMB-NEXT: ldr.w pc, [r12]
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// THUMB-NEXT: b 0x
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// THUMB-EMPTY:
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// THUMB-NEXT: <func3@plt>:
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// THUMB-NEXT: movw r12, #112
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// THUMB-NEXT: movt r12, #2
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// THUMB-NEXT: add r12, pc
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// THUMB-NEXT: ldr.w pc, [r12]
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// THUMB-NEXT: b 0x
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// Test PLT section with long entries parsing on arm.
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// RUN: echo "SECTIONS { \
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// RUN: .text 0x1000 : { *(.text) } \
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// RUN: .plt 0x2000 : { *(.plt) *(.plt.*) } \
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// RUN: .got.plt 0x9000000 : { *(.got.plt) } \
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// RUN: }" > %t.long.script
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// RUN: %clang --target=armv6a-none-linux-gnueabi -fuse-ld=lld \
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// RUN: -Xlinker --script=%t.long.script -nostdlib -nostdinc \
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// RUN: -shared %s -o %t.v6a.long
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// RUN: llvm-objdump --no-show-raw-insn --no-print-imm-hex \
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// RUN: -d %t.v6a.long | FileCheck %s --check-prefixes=CHECKLONG,LE
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// Test PLT section with long entries parsing on armeb.
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// RUN: %clang --target=armv6aeb-none-linux-gnueabi -fuse-ld=lld \
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// RUN: -Xlinker --script=%t.long.script -nostdlib -nostdinc \
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// RUN: -shared %s -o %t.v6aeb.long
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// RUN: llvm-objdump --no-show-raw-insn --no-print-imm-hex \
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// RUN: -d %t.v6aeb.long | FileCheck %s --check-prefixes=CHECKLONG,BE
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// RUN: obj2yaml %t.v6aeb.long | FileCheck %s --check-prefixes=NOBE8
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// Test PLT section with long entries parsing on armeb with be8.
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// RUN: %clang --target=armv7aeb-none-linux-gnueabi -fuse-ld=lld \
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// RUN: -Xlinker --script=%t.long.script -nostdlib -nostdinc \
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// RUN: -shared %s -o %t.v7aeb.long
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// RUN: llvm-objdump --no-show-raw-insn --no-print-imm-hex \
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// RUN: -d %t.v7aeb.long | FileCheck %s --check-prefixes=CHECKLONG,BE
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// RUN: obj2yaml %t.v7aeb.long | FileCheck %s --check-prefixes=BE8
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// CHECKLONG: Disassembly of section .text:
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// CHECKLONG-EMPTY:
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// CHECKLONG-NEXT: <_start>:
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// CHECKLONG-NEXT: push {r11, lr}
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// CHECKLONG-NEXT: mov r11, sp
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// CHECKLONG-NEXT: bl 0x2020 <func1@plt>
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// CHECKLONG-NEXT: bl 0x2030 <func2@plt>
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// CHECKLONG-NEXT: bl 0x2040 <func3@plt>
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// CHECKLONG: Disassembly of section .plt:
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// CHECKLONG: 00002020 <func1@plt>:
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// CHECKLONG-NEXT: ldr r12, [pc, #4]
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// CHECKLONG-NEXT: add r12, r12, pc
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// CHECKLONG-NEXT: ldr pc, [r12]
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// CHECKLONG-NEXT: .word 0x08ffdfe0
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// CHECKLONG-EMPTY:
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// CHECKLONG-NEXT: 00002030 <func2@plt>:
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// CHECKLONG-NEXT: ldr r12, [pc, #4]
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// CHECKLONG-NEXT: add r12, r12, pc
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// CHECKLONG-NEXT: ldr pc, [r12]
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// CHECKLONG-NEXT: .word 0x08ffdfd4
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// CHECKLONG-EMPTY:
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// CHECKLONG-NEXT: 00002040 <func3@plt>:
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// CHECKLONG-NEXT: ldr r12, [pc, #4]
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// CHECKLONG-NEXT: add r12, r12, pc
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// CHECKLONG-NEXT: ldr pc, [r12]
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// CHECKLONG-NEXT: .word 0x08ffdfc8
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// Test PLT section with mixed long and short entries parsing on arm.
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// RUN: echo "SECTIONS { \
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// RUN: .text 0x1000 : { *(.text) } \
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// RUN: .plt 0x2000 : { *(.plt) *(.plt.*) } \
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// RUN: .got.plt 0x8002020 : { *(.got.plt) } \
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// RUN: }" > %t.mix.script
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// RUN: %clang --target=armv6a-none-linux-gnueabi -fuse-ld=lld \
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// RUN: -Xlinker --script=%t.mix.script -nostdlib -nostdinc \
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// RUN: -shared %s -o %t.v6a.mix
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// RUN: llvm-objdump --no-show-raw-insn --no-print-imm-hex \
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// RUN: -d %t.v6a.mix | FileCheck %s --check-prefixes=CHECKMIX,LE
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// Test PLT section with mixed long and short entries parsing on armeb.
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// RUN: %clang --target=armv6aeb-none-linux-gnueabi -fuse-ld=lld \
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// RUN: -Xlinker --script=%t.mix.script -nostdlib -nostdinc \
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// RUN: -shared %s -o %t.v6aeb.mix
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// RUN: llvm-objdump --no-show-raw-insn --no-print-imm-hex \
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// RUN: -d %t.v6aeb.mix | FileCheck %s --check-prefixes=CHECKMIX,BE
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// RUN: obj2yaml %t.v6aeb.mix | FileCheck %s --check-prefixes=NOBE8
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// Test PLT section with mixed long and short entries parsing on armeb with be8.
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// RUN: %clang --target=armv7aeb-none-linux-gnueabi -fuse-ld=lld \
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// RUN: -Xlinker --script=%t.mix.script -nostdlib -nostdinc \
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// RUN: -shared %s -o %t.v7aeb.mix
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// RUN: llvm-objdump --no-show-raw-insn --no-print-imm-hex \
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// RUN: -d %t.v7aeb.mix | FileCheck %s --check-prefixes=CHECKMIX,BE
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// RUN: obj2yaml %t.v7aeb.mix | FileCheck %s --check-prefixes=BE8
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// CHECKMIX: Disassembly of section .text:
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// CHECKMIX-EMPTY:
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// CHECKMIX-NEXT: <_start>:
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// CHECKMIX-NEXT: push {r11, lr}
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// CHECKMIX-NEXT: mov r11, sp
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// CHECKMIX-NEXT: bl 0x2020 <func1@plt>
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// CHECKMIX-NEXT: bl 0x2030 <func2@plt>
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// CHECKMIX-NEXT: bl 0x2040 <func3@plt>
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// CHECKMIX: Disassembly of section .plt:
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// CHECKMIX: 00002020 <func1@plt>:
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// CHECKMIX-NEXT: ldr r12, [pc, #4]
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// CHECKMIX-NEXT: add r12, r12, pc
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// CHECKMIX-NEXT: ldr pc, [r12]
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// CHECKMIX-NEXT: .word 0x08000000
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// CHECKMIX-EMPTY:
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// CHECKMIX-NEXT: 00002030 <func2@plt>:
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// CHECKMIX-NEXT: add r12, pc, #133169152
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// CHECKMIX-NEXT: add r12, r12, #1044480
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// CHECKMIX-NEXT: ldr pc, [r12, #4088]!
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// CHECKMIX-NEXT: .word 0xd4d4d4d4
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// CHECKMIX-EMPTY:
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// CHECKMIX-NEXT: 00002040 <func3@plt>:
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// CHECKMIX-NEXT: add r12, pc, #133169152
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// CHECKMIX-NEXT: add r12, r12, #1044480
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// CHECKMIX-NEXT: ldr pc, [r12, #4076]!
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// CHECKMIX-NEXT: .word 0xd4d4d4d4
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extern void *func1();
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extern void *func2();
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extern void *func3();
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void _start() {
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func1();
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func2();
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func3();
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}

‎lld/test/ELF/arm-gnu-ifunc-plt.s

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// DISASM-NEXT: 20214: d4 d4 d4 d4 .word 0xd4d4d4d4
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// DISASM-NEXT: 20218: d4 d4 d4 d4 .word 0xd4d4d4d4
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// DISASM-NEXT: 2021c: d4 d4 d4 d4 .word 0xd4d4d4d4
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// DISASM-EMPTY:
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// DISASM-NEXT: <bar2@plt>:
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// DISASM-NEXT: 20220: add r12, pc, #0, #12
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// DISASM-NEXT: 20224: add r12, r12, #32
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// DISASM-NEXT: 20228: ldr pc, [r12, #212]!
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// DISASM-NEXT: 2022c: d4 d4 d4 d4 .word 0xd4d4d4d4
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// DISASM-EMPTY:
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// DISASM-NEXT: <zed2@plt>:
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// DISASM-NEXT: 20230: add r12, pc, #0, #12
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// DISASM-NEXT: 20234: add r12, r12, #32
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// DISASM-NEXT: 20238: ldr pc, [r12, #200]!

‎lld/test/ELF/arm-mixed-plts.s

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# CHECK-NEXT: d4 d4 d4 d4 .word 0xd4d4d4d4
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# CHECK-NEXT: d4 d4 d4 d4 .word 0xd4d4d4d4
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# CHECK-NEXT: d4 d4 d4 d4 .word 0xd4d4d4d4
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# CHECK-EMPTY:
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# CHECK-NEXT: <bar@plt>:
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# CHECK-NEXT: e28fc600 add r12, pc, #0, #12
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# CHECK-NEXT: e28cca20 add r12, r12, #32, #20
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# CHECK-NEXT: e5bcf06c ldr pc, [r12, #0x6c]!

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