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llvm-project/lld/test/ELF/arm-thumb-interwork-thunk.s

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// REQUIRES: arm
// RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi %s -o %t
// RUN: echo "SECTIONS { \
// RUN: . = SIZEOF_HEADERS; \
// RUN: .R_ARM_JUMP24_callee_1 : { *(.R_ARM_JUMP24_callee_low) } \
// RUN: .R_ARM_THM_JUMP_callee_1 : { *(.R_ARM_THM_JUMP_callee_low)} \
// RUN: .text : { *(.text) } \
// RUN: .arm_caller : { *(.arm_caller) } \
// RUN: .thumb_caller : { *(.thumb_caller) } \
// RUN: .R_ARM_JUMP24_callee_2 : { *(.R_ARM_JUMP24_callee_high) } \
// RUN: .R_ARM_THM_JUMP_callee_2 : { *(.R_ARM_THM_JUMP_callee_high) } \
// RUN: .got.plt 0x18b4 : { } } " > %t.script
// RUN: ld.lld --script %t.script %t -o %t2 2>&1
// RUN: llvm-objdump -d -triple=thumbv7a-none-linux-gnueabi %t2 | FileCheck -check-prefix=CHECK-THUMB -check-prefix=CHECK-ABS-THUMB %s
// RUN: llvm-objdump -d -triple=armv7a-none-linux-gnueabi %t2 | FileCheck -check-prefix=CHECK-ARM -check-prefix=CHECK-ABS-ARM %s
// RUN: ld.lld --script %t.script %t -pie -o %t3 2>&1
// RUN: ld.lld --script %t.script %t --shared -o %t4 2>&1
// RUN: llvm-objdump -d -triple=thumbv7a-none-linux-gnueabi %t3 | FileCheck -check-prefix=CHECK-THUMB -check-prefix=CHECK-PI-THUMB %s
// RUN: llvm-objdump -d -triple=armv7a-none-linux-gnueabi %t3 | FileCheck -check-prefix=CHECK-ARM -check-prefix=CHECK-PI-ARM %s
// RUN: llvm-objdump -d -triple=thumbv7a-none-linux-gnueabi %t4 | FileCheck -check-prefix=CHECK-THUMB -check-prefix=CHECK-PI-PLT-THUMB %s
// RUN: llvm-objdump -d -triple=armv7a-none-linux-gnueabi %t4 | FileCheck -check-prefix=CHECK-ARM -check-prefix=CHECK-PI-PLT-ARM %s
// RUN: llvm-readobj -s -r %t4 | FileCheck -check-prefix=CHECK-DSO-REL %s
// Test ARM Thumb Interworking
// The file is linked and checked 3 times to check the following contexts
// - Absolute executables, absolute Thunks are used.
// - Position independent executables, position independent Thunks are used.
// - Shared object, position independent Thunks to PLT entries are used.
.syntax unified
// Target Sections for thunks at a lower address than the callers.
.section .R_ARM_JUMP24_callee_low, "ax", %progbits
.thumb
.balign 0x1000
.globl thumb_callee1
.type thumb_callee1, %function
thumb_callee1:
bx lr
// CHECK-THUMB: Disassembly of section .R_ARM_JUMP24_callee_1:
// CHECK-THUMB: thumb_callee1:
// CHECK-THUMB: 1000: 70 47 bx
.section .R_ARM_THM_JUMP_callee_low, "ax", %progbits
.arm
.balign 0x100
.globl arm_callee1
.type arm_callee1, %function
arm_callee1:
bx lr
// Disassembly of section .R_ARM_THM_JUMP_callee_1:
// CHECK-ARM: arm_callee1:
// CHECK-ARM-NEXT: 1100: 1e ff 2f e1 bx lr
// Calling sections
// At present ARM and Thumb interworking thunks are always added to the calling
// section.
.section .arm_caller, "ax", %progbits
.arm
.balign 0x100
.globl arm_caller
.type arm_caller, %function
arm_caller:
// If target supports BLX and target is in range we don't need an
// interworking thunk for a BL or BLX instruction.
bl thumb_callee1
blx thumb_callee1
// A B instruction can't be transformed into a BLX and needs an interworking
// thunk
b thumb_callee1
// As long as the thunk is in range it can be reused
b thumb_callee1
// There can be more than one thunk associated with a section
b thumb_callee2
b thumb_callee3
// In range ARM targets do not require interworking thunks
b arm_callee1
beq arm_callee2
bne arm_callee3
bx lr
// CHECK-ARM-ABS-ARM: Disassembly of section .arm_caller:
// CHECK-ARM-ABS-ARM-NEXT: arm_caller:
// CHECK-ARM-ABS-ARM-NEXT: 1300: 3e ff ff fa blx #-776 <thumb_callee1>
// CHECK-ARM-ABS-ARM-NEXT: 1304: 3d ff ff fa blx #-780 <thumb_callee1>
// CHECK-ARM-ABS-ARM-NEXT: 1308: 06 00 00 ea b #24 <__ARMv7ABSLongThunk_thumb_callee1>
// CHECK-ARM-ABS-ARM-NEXT: 130c: 05 00 00 ea b #20 <__ARMv7ABSLongThunk_thumb_callee1>
// CHECK-ARM-ABS-ARM-NEXT: 1310: 07 00 00 ea b #28 <__ARMv7ABSLongThunk_thumb_callee2>
// CHECK-ARM-ABS-ARM-NEXT: 1314: 09 00 00 ea b #36 <__ARMv7ABSLongThunk_thumb_callee3>
// CHECK-ARM-ABS-ARM-NEXT: 1318: 78 ff ff ea b #-544 <arm_callee1>
// CHECK-ARM-ABS-ARM-NEXT: 131c: b7 00 00 0a beq #732 <arm_callee2>
// CHECK-ARM-ABS-ARM-NEXT: 1320: b7 00 00 1a bne #732 <arm_callee3>
// CHECK-ARM-ABS-ARM-NEXT: 1324: 1e ff 2f e1 bx lr
// CHECK-ARM-ABS-ARM: __ARMv7ABSLongThunk_thumb_callee1:
// 0x1001 = thumb_callee1
// CHECK-ARM-ABS-ARM-NEXT: 1328: 01 c0 01 e3 movw r12, #4097
// CHECK-ARM-ABS-ARM-NEXT: 132c: 00 c0 40 e3 movt r12, #0
// CHECK-ARM-ABS-ARM-NEXT: 1330: 1c ff 2f e1 bx r12
// 0x1501 = thumb_callee2
// CHECK-ARM-ABS-ARM: __ARMv7ABSLongThunk_thumb_callee2:
// CHECK-ARM-ABS-ARM-NEXT: 1334: 01 c5 01 e3 movw r12, #5377
// CHECK-ARM-ABS-ARM-NEXT: 1338: 00 c0 40 e3 movt r12, #0
// CHECK-ARM-ABS-ARM-NEXT: 133c: 1c ff 2f e1 bx r12
// 0x1503 = thumb_callee3
// CHECK-ARM-ABS-ARM: __ARMv7ABSLongThunk_thumb_callee3:
// CHECK-ARM-ABS-ARM-NEXT: 1340: 03 c5 01 e3 movw r12, #5379
// CHECK-ARM-ABS-ARM-NEXT: 1344: 00 c0 40 e3 movt r12, #0
// CHECK-ARM-ABS-ARM-NEXT: 1348: 1c ff 2f e1 bx r12
// CHECK-PI-ARM: Disassembly of section .arm_caller:
// CHECK-PI-ARM-NEXT: arm_caller:
// CHECK-PI-ARM-NEXT: 1300: 3e ff ff fa blx #-776 <thumb_callee1>
// CHECK-PI-ARM-NEXT: 1304: 3d ff ff fa blx #-780 <thumb_callee1>
// CHECK-PI-ARM-NEXT: 1308: 06 00 00 ea b #24 <__ARMV7PILongThunk_thumb_callee1>
// CHECK-PI-ARM-NEXT: 130c: 05 00 00 ea b #20 <__ARMV7PILongThunk_thumb_callee1>
// CHECK-PI-ARM-NEXT: 1310: 08 00 00 ea b #32 <__ARMV7PILongThunk_thumb_callee2>
// CHECK-PI-ARM-NEXT: 1314: 0b 00 00 ea b #44 <__ARMV7PILongThunk_thumb_callee3>
// CHECK-PI-ARM-NEXT: 1318: 78 ff ff ea b #-544 <arm_callee1>
// CHECK-PI-ARM-NEXT: 131c: b7 00 00 0a beq #732 <arm_callee2>
// CHECK-PI-ARM-NEXT: 1320: b7 00 00 1a bne #732 <arm_callee3>
// CHECK-PI-ARM-NEXT: 1324: 1e ff 2f e1 bx lr
// CHECK-PI-ARM: __ARMV7PILongThunk_thumb_callee1:
// 0x1330 + 8 - 0x337 = 0x1001 = thumb_callee1
// CHECK-PI-ARM-NEXT: 1328: c9 cc 0f e3 movw r12, #64713
// CHECK-PI-ARM-NEXT: 132c: ff cf 4f e3 movt r12, #65535
// CHECK-PI-ARM-NEXT: 1330: 0f c0 8c e0 add r12, r12, pc
// CHECK-PI-ARM-NEXT: 1334: 1c ff 2f e1 bx r12
// CHECK-PI-ARM: __ARMV7PILongThunk_thumb_callee2:
// CHECK-PI-ARM-NEXT: 1338: b9 c1 00 e3 movw r12, #441
// CHECK-PI-ARM-NEXT: 133c: 00 c0 40 e3 movt r12, #0
// CHECK-PI-ARM-NEXT: 1340: 0f c0 8c e0 add r12, r12, pc
// CHECK-PI-ARM-NEXT: 1344: 1c ff 2f e1 bx r12
// CHECK-PI-ARM: __ARMV7PILongThunk_thumb_callee3:
// 0x1340 + 8 + 0x1b9 = 0x1501
// CHECK-PI-ARM-NEXT: 1348: ab c1 00 e3 movw r12, #427
// CHECK-PI-ARM-NEXT: 134c: 00 c0 40 e3 movt r12, #0
// CHECK-PI-ARM-NEXT: 1350: 0f c0 8c e0 add r12, r12, pc
// CHECK-PI-ARM-NEXT: 1354: 1c ff 2f e1 bx r12
// 1350 + 8 + 0x1ab = 0x1503
// All PLT entries are ARM, no need for interworking thunks
// CHECK-PI-ARM-PLT: Disassembly of section .arm_caller:
// CHECK-PI-ARM-PLT-NEXT: arm_caller:
// 0x17e4 PLT(thumb_callee1)
// CHECK-PI-ARM-PLT-NEXT: 1300: 37 01 00 eb bl #1244
// 0x17e4 PLT(thumb_callee1)
// CHECK-PI-ARM-PLT-NEXT: 1304: 36 01 00 eb bl #1240
// 0x17e4 PLT(thumb_callee1)
// CHECK-PI-ARM-PLT-NEXT: 1308: 35 01 00 ea b #1236
// 0x17e4 PLT(thumb_callee1)
// CHECK-PI-ARM-PLT-NEXT: 130c: 34 01 00 ea b #1232
// 0x17f4 PLT(thumb_callee2)
// CHECK-PI-ARM-PLT-NEXT: 1310: 37 01 00 ea b #1244
// 0x1804 PLT(thumb_callee3)
// CHECK-PI-ARM-PLT-NEXT: 1314: 3a 01 00 ea b #1256
// 0x1814 PLT(arm_callee1)
// CHECK-PI-ARM-PLT-NEXT: 1318: 3d 01 00 ea b #1268
// 0x1824 PLT(arm_callee2)
// CHECK-PI-ARM-PLT-NEXT: 131c: 40 01 00 0a beq #1280
// 0x1834 PLT(arm_callee3)
// CHECK-PI-ARM-PLT-NEXT: 1320: 43 01 00 1a bne #1292
// CHECK-PI-ARM-PLT-NEXT: 1324: 1e ff 2f e1 bx lr
.section .thumb_caller, "ax", %progbits
.balign 0x100
.thumb
.globl thumb_caller
.type thumb_caller, %function
thumb_caller:
// If target supports BLX and target is in range we don't need an
// interworking thunk for a BL or BLX instruction.
bl arm_callee1
blx arm_callee1
// A B instruction can't be transformed into a BLX and needs an interworking
// thunk
b.w arm_callee1
// As long as the thunk is in range it can be reused
b.w arm_callee2
// There can be more than one thunk associated with a section
b.w arm_callee3
// Conditional branches also require interworking thunks, they can use the
// same interworking thunks.
beq.w arm_callee1
beq.w arm_callee2
bne.w arm_callee3
// CHECK-ABS-THUMB: Disassembly of section .thumb_caller:
// CHECK-ABS-THUMB-NEXT: thumb_caller:
// CHECK-ABS-THUMB-NEXT: 1400: ff f7 7e ee blx #-772
// CHECK-ABS-THUMB-NEXT: 1404: ff f7 7c ee blx #-776
// CHECK-ABS-THUMB-NEXT: 1408: 00 f0 0a b8 b.w #20 <__Thumbv7ABSLongThunk_arm_callee1>
// CHECK-ABS-THUMB-NEXT: 140c: 00 f0 0d b8 b.w #26 <__Thumbv7ABSLongThunk_arm_callee2>
// CHECK-ABS-THUMB-NEXT: 1410: 00 f0 10 b8 b.w #32 <__Thumbv7ABSLongThunk_arm_callee3>
// CHECK-ABS-THUMB-NEXT: 1414: 00 f0 04 80 beq.w #8 <__Thumbv7ABSLongThunk_arm_callee1>
// CHECK-ABS-THUMB-NEXT: 1418: 00 f0 07 80 beq.w #14 <__Thumbv7ABSLongThunk_arm_callee2>
// CHECK-ABS-THUMB-NEXT: 141c: 40 f0 0a 80 bne.w #20 <__Thumbv7ABSLongThunk_arm_callee3>
// CHECK-ABS-THUMB: __Thumbv7ABSLongThunk_arm_callee1:
// 0x1100 = arm_callee1
// CHECK-ABS-THUMB-NEXT: 1420: 41 f2 00 1c movw r12, #4352
// CHECK-ABS-THUMB-NEXT: 1424: c0 f2 00 0c movt r12, #0
// CHECK-ABS-THUMB-NEXT: 1428: 60 47 bx r12
// CHECK-ABS-THUMB: __Thumbv7ABSLongThunk_arm_callee2:
// 0x1600 = arm_callee2
// CHECK-ABS-THUMB-NEXT: 142a: 41 f2 00 6c movw r12, #5632
// CHECK-ABS-THUMB-NEXT: 142e: c0 f2 00 0c movt r12, #0
// CHECK-ABS-THUMB-NEXT: 1432: 60 47 bx r12
// 0x1604 = arm_callee3
// CHECK-ABS-THUMB: __Thumbv7ABSLongThunk_arm_callee3:
// CHECK-ABS-THUMB-NEXT: 1434: 41 f2 04 6c movw r12, #5636
// CHECK-ABS-THUMB-NEXT: 1438: c0 f2 00 0c movt r12, #0
// CHECK-ABS-THUMB-NEXT: 143c: 60 47 bx r12
// CHECK-PI-THUMB: Disassembly of section .thumb_caller:
// CHECK-PI-THUMB-NEXT: thumb_caller:
// CHECK-PI-THUMB-NEXT: 1400: ff f7 7e ee blx #-772
// CHECK-PI-THUMB-NEXT: 1404: ff f7 7c ee blx #-776
// CHECK-PI-THUMB-NEXT: 1408: 00 f0 0a b8 b.w #20 <__ThumbV7PILongThunk_arm_callee1>
// CHECK-PI-THUMB-NEXT: 140c: 00 f0 0e b8 b.w #28 <__ThumbV7PILongThunk_arm_callee2>
// CHECK-PI-THUMB-NEXT: 1410: 00 f0 12 b8 b.w #36 <__ThumbV7PILongThunk_arm_callee3>
// CHECK-PI-THUMB-NEXT: 1414: 00 f0 04 80 beq.w #8 <__ThumbV7PILongThunk_arm_callee1>
// CHECK-PI-THUMB-NEXT: 1418: 00 f0 08 80 beq.w #16 <__ThumbV7PILongThunk_arm_callee2>
// CHECK-PI-THUMB-NEXT: 141c: 40 f0 0c 80 bne.w #24 <__ThumbV7PILongThunk_arm_callee3>
// CHECK-PI-THUMB: __ThumbV7PILongThunk_arm_callee1:
// 0x1428 + 4 - 0x32c = 0x1100 = arm_callee1
// CHECK-PI-THUMB-NEXT: 1420: 4f f6 d4 4c movw r12, #64724
// CHECK-PI-THUMB-NEXT: 1424: cf f6 ff 7c movt r12, #65535
// CHECK-PI-THUMB-NEXT: 1428: fc 44 add r12, pc
// CHECK-PI-THUMB-NEXT: 142a: 60 47 bx r12
// CHECK-PI-THUMB: __ThumbV7PILongThunk_arm_callee2:
// 0x1434 + 4 + 0x1c8 = 0x1600 = arm_callee2
// CHECK-PI-THUMB-NEXT: 142c: 40 f2 c8 1c movw r12, #456
// CHECK-PI-THUMB-NEXT: 1430: c0 f2 00 0c movt r12, #0
// CHECK-PI-THUMB-NEXT: 1434: fc 44 add r12, pc
// CHECK-PI-THUMB-NEXT: 1436: 60 47 bx r12
// CHECK-PI-THUMB: __ThumbV7PILongThunk_arm_callee3:
// 0x1440 + 4 + 0x1c0 = 0x1604 = arm_callee3
// CHECK-PI-THUMB-NEXT: 1438: 40 f2 c0 1c movw r12, #448
// CHECK-PI-THUMB-NEXT: 143c: c0 f2 00 0c movt r12, #0
// CHECK-PI-THUMB-NEXT: 1440: fc 44 add r12, pc
// CHECK-PI-THUMB-NEXT: 1442: 60 47 bx r12
// CHECK-PI-THUMB-PLT: Disassembly of section .arm_caller:
// CHECK-PI-THUMB-PLT-NEXT: thumb_caller:
// 0x1400 + 4 + 0x410 = 0x1814 = PLT(arm_callee1)
// CHECK-PI-THUMB-PLT-NEXT: 1400: 00 f0 08 ea blx #1040
// 0x1404 + 4 + 0x40c = 0x1814 = PLT(arm_callee1)
// CHECK-PI-THUMB-PLT-NEXT: 1404: 00 f0 06 ea blx #1036
// 0x1408 + 4 + 0x14 = 0x1420 = IWV(PLT(arm_callee1)
// CHECK-PI-THUMB-PLT-NEXT: 1408: 00 f0 0a b8 b.w #20
// 0x140c + 4 + 0x1c = 0x142c = IWV(PLT(arm_callee2)
// CHECK-PI-THUMB-PLT-NEXT: 140c: 00 f0 0e b8 b.w #28
// 0x1410 + 4 + 0x24 = 0x1438 = IWV(PLT(arm_callee3)
// CHECK-PI-THUMB-PLT-NEXT: 1410: 00 f0 12 b8 b.w #36
// 0x1414 + 4 + 8 = 0x1420 = IWV(PLT(arm_callee1)
// CHECK-PI-THUMB-PLT-NEXT: 1414: 00 f0 04 80 beq.w #8
// 0x1418 + 4 + 0x10 = 0x142c = IWV(PLT(arm_callee2)
// CHECK-PI-THUMB-PLT-NEXT: 1418: 00 f0 08 80 beq.w #16
// 0x141c + 4 + 0x18 = 0x1438 = IWV(PLT(arm_callee3)
// CHECK-PI-THUMB-PLT-NEXT: 141c: 40 f0 0c 80 bne.w #24
// 0x1428 + 4 + 0x3e8 = 0x1814 = PLT(arm_callee1)
// CHECK-PI-THUMB-PLT-NEXT: 1420: 40 f2 e8 3c movw r12, #1000
// CHECK-PI-THUMB-PLT-NEXT: 1424: c0 f2 00 0c movt r12, #0
// CHECK-PI-THUMB-PLT-NEXT: 1428: fc 44 add r12, pc
// CHECK-PI-THUMB-PLT-NEXT: 142a: 60 47 bx r12
// 0x1434 + 4 + 0x3ec = 0x1824 = PLT(arm_callee2)
// CHECK-PI-THUMB-PLT-NEXT: 142c: 40 f2 ec 3c movw r12, #1004
// CHECK-PI-THUMB-PLT-NEXT: 1430: c0 f2 00 0c movt r12, #0
// CHECK-PI-THUMB-PLT-NEXT: 1434: fc 44 add r12, pc
// CHECK-PI-THUMB-PLT-NEXT: 1436: 60 47 bx r12
// 0x1440 + 4 + 0x3f0 = 0x1834 = PLT(arm_callee3)
// CHECK-PI-THUMB-PLT-NEXT: 1438: 40 f2 f0 3c movw r12, #1008
// CHECK-PI-THUMB-PLT-NEXT: 143c: c0 f2 00 0c movt r12, #0
// CHECK-PI-THUMB-PLT-NEXT: 1440: fc 44 add r12, pc
// CHECK-PI-THUMB-PLT-NEXT: 1442: 60 47 bx r12
// Target Sections for thunks at a higher address than the callers.
.section .R_ARM_JUMP24_callee_high, "ax", %progbits
.thumb
.balign 0x100
.globl thumb_callee2
.type thumb_callee2, %function
thumb_callee2:
bx lr
.globl thumb_callee3
.type thumb_callee3, %function
thumb_callee3:
bx lr
// CHECK-THUMB: Disassembly of section .R_ARM_JUMP24_callee_2:
// CHECK-THUMB-NEXT: thumb_callee2:
// CHECK-THUMB-NEXT: 1500: 70 47 bx lr
// CHECK-THUMB: thumb_callee3:
// CHECK-THUMB-NEXT: 1502: 70 47 bx lr
.section .R_ARM_THM_JUMP_callee_high, "ax", %progbits
.arm
.balign 0x100
.globl arm_callee2
.type arm_callee2, %function
arm_callee2:
bx lr
.globl arm_callee3
.type arm_callee3, %function
arm_callee3:
bx lr
// CHECK-ARM: Disassembly of section .R_ARM_THM_JUMP_callee_2:
// CHECK-ARM-NEXT: arm_callee2:
// CHECK-ARM-NEXT: 1600: 1e ff 2f e1 bx lr
// CHECK-ARM: arm_callee3:
// CHECK-ARM-NEXT: 1604: 1e ff 2f e1 bx lr
// _start section just calls the arm and thumb calling sections
.text
.arm
.globl _start
.balign 0x100
.type _start, %function
_start:
bl arm_caller
bl thumb_caller
bx lr
// CHECK-PI-ARM-PLT: Disassembly of section .plt:
// CHECK-PI-ARM-PLT-NEXT: .plt:
// CHECK-PI-ARM-PLT-NEXT: 17b0: 04 e0 2d e5 str lr, [sp, #-4]!
// CHECK-PI-ARM-PLT-NEXT: 17b4: 04 e0 9f e5 ldr lr, [pc, #4]
// CHECK-PI-ARM-PLT-NEXT: 17b8: 0e e0 8f e0 add lr, pc, lr
// CHECK-PI-ARM-PLT-NEXT: 17bc: 08 f0 be e5 ldr pc, [lr, #8]!
// CHECK-PI-ARM-PLT-NEXT: 17c0: d4 00 00 00
// 0x17c8 + 8 + 0xd0 = 0x18a0 arm_caller
// CHECK-PI-ARM-PLT-NEXT: 17c4: 04 c0 9f e5 ldr r12, [pc, #4]
// CHECK-PI-ARM-PLT-NEXT: 17c8: 0f c0 8c e0 add r12, r12, pc
// CHECK-PI-ARM-PLT-NEXT: 17cc: 00 f0 9c e5 ldr pc, [r12]
// CHECK-PI-ARM-PLT-NEXT: 17d0: d0 00 00 00
// 0x17d8 + 8 + 0xc4 = 0x18a4 thumb_caller
// CHECK-PI-ARM-PLT-NEXT: 17d4: 04 c0 9f e5 ldr r12, [pc, #4]
// CHECK-PI-ARM-PLT-NEXT: 17d8: 0f c0 8c e0 add r12, r12, pc
// CHECK-PI-ARM-PLT-NEXT: 17dc: 00 f0 9c e5 ldr pc, [r12]
// CHECK-PI-ARM-PLT-NEXT: 17e0: c4 00 00 00
// 0x17e8 + 8 + 0xb8 = 0x18a8 thumb_callee1
// CHECK-PI-ARM-PLT-NEXT: 17e4: 04 c0 9f e5 ldr r12, [pc, #4]
// CHECK-PI-ARM-PLT-NEXT: 17e8: 0f c0 8c e0 add r12, r12, pc
// CHECK-PI-ARM-PLT-NEXT: 17ec: 00 f0 9c e5 ldr pc, [r12]
// CHECK-PI-ARM-PLT-NEXT: 17f0: b8 00 00 00
// 0x17f8 + 8 + 0xac = 0x18ac thumb_callee2
// CHECK-PI-ARM-PLT-NEXT: 17f4: 04 c0 9f e5 ldr r12, [pc, #4]
// CHECK-PI-ARM-PLT-NEXT: 17f8: 0f c0 8c e0 add r12, r12, pc
// CHECK-PI-ARM-PLT-NEXT: 17fc: 00 f0 9c e5 ldr pc, [r12]
// CHECK-PI-ARM-PLT-NEXT: 1800: ac 00 00 00
// 0x1808 + 8 + 0xa0 = 0x18b0 thumb_callee3
// CHECK-PI-ARM-PLT-NEXT: 1804: 04 c0 9f e5 ldr r12, [pc, #4]
// CHECK-PI-ARM-PLT-NEXT: 1808: 0f c0 8c e0 add r12, r12, pc
// CHECK-PI-ARM-PLT-NEXT: 180c: 00 f0 9c e5 ldr pc, [r12]
// CHECK-PI-ARM-PLT-NEXT: 1810: a0 00 00 00
// 0x1818 + 8 + 0x94 = 0x18b4 arm_callee1
// CHECK-PI-ARM-PLT-NEXT: 1814: 04 c0 9f e5 ldr r12, [pc, #4]
// CHECK-PI-ARM-PLT-NEXT: 1818: 0f c0 8c e0 add r12, r12, pc
// CHECK-PI-ARM-PLT-NEXT: 181c: 00 f0 9c e5 ldr pc, [r12]
// CHECK-PI-ARM-PLT-NEXT: 1820: 94 00 00 00
// 0x1828 + 8 + 0x88 = 0x18b8 arm_callee2
// CHECK-PI-ARM-PLT-NEXT: 1824: 04 c0 9f e5 ldr r12, [pc, #4]
// CHECK-PI-ARM-PLT-NEXT: 1828: 0f c0 8c e0 add r12, r12, pc
// CHECK-PI-ARM-PLT-NEXT: 182c: 00 f0 9c e5 ldr pc, [r12]
// CHECK-PI-ARM-PLT-NEXT: 1830: 88 00 00 00
// 0x1838 + 8 + 0x7c = 0x18bc arm_callee3
// CHECK-PI-ARM-PLT-NEXT: 1834: 04 c0 9f e5 ldr r12, [pc, #4]
// CHECK-PI-ARM-PLT-NEXT: 1838: 0f c0 8c e0 add r12, r12, pc
// CHECK-PI-ARM-PLT-NEXT: 183c: 00 f0 9c e5 ldr pc, [r12]
// CHECK-PI-ARM-PLT-NEXT: 1840: 7c 00 00 00
// CHECK-DSO-REL: 0x18C0 R_ARM_JUMP_SLOT arm_caller
// CHECK-DSO-REL-NEXT: 0x18C4 R_ARM_JUMP_SLOT thumb_caller
// CHECK-DSO-REL-NEXT: 0x18C8 R_ARM_JUMP_SLOT thumb_callee1
// CHECK-DSO-REL-NEXT: 0x18CC R_ARM_JUMP_SLOT thumb_callee2
// CHECK-DSO-REL-NEXT: 0x18D0 R_ARM_JUMP_SLOT thumb_callee3
// CHECK-DSO-REL-NEXT: 0x18D4 R_ARM_JUMP_SLOT arm_callee1
// CHECK-DSO-REL-NEXT: 0x18D8 R_ARM_JUMP_SLOT arm_callee2
// CHECK-DSO-REL-NEXT: 0x18DC R_ARM_JUMP_SLOT arm_callee3
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