| // REQUIRES: arm |
| // RUN: llvm-mc -arm-add-build-attributes -filetype=obj -triple=armv6-none-linux-gnueabi %s -o %t |
| // RUN: ld.lld %t -o %t2 |
| // RUN: llvm-objdump -d --triple=armv6-none-linux-gnueabi --start-address=0x21000 --stop-address=0x21008 %t2 | FileCheck --check-prefix=CHECK-ARM1 %s |
| // RUN: llvm-objdump -d --triple=thumbv6-none-linux-gnueabi %t2 --start-address=0x21008 --stop-address=0x2100c | FileCheck --check-prefix=CHECK-THUMB1 %s |
| // RUN: llvm-objdump -d --triple=armv6-none-linux-gnueabi --start-address=0x22100c --stop-address=0x221014 %t2 | FileCheck --check-prefix=CHECK-ARM2 %s |
| // RUN: llvm-objdump -d --triple=thumbv6-none-linux-gnueabi %t2 --start-address=0x622000 --stop-address=0x622002 | FileCheck --check-prefix=CHECK-THUMB2 %s |
| |
| /// On Arm v6 the range of a Thumb BL instruction is only 4 megabytes as the |
| /// extended range encoding is not supported. The following example has a Thumb |
| /// BL that is out of range on ARM v6 and requires a range extension thunk. |
| /// As v6 does not support MOVT or MOVW instructions the Thunk must not |
| /// use these instructions either. |
| |
| |
| /// ARM v6 supports blx so we shouldn't see the blx not supported warning. |
| // CHECK-NOT: warning: lld uses blx instruction, no object with architecture supporting feature detected. |
| .text |
| .syntax unified |
| .cpu arm1176jzf-s |
| .globl _start |
| .type _start,%function |
| .balign 0x1000 |
| _start: |
| bl thumbfunc |
| bx lr |
| |
| // CHECK-ARM1: Disassembly of section .text: |
| // CHECK-ARM1-EMPTY: |
| // CHECK-ARM1-NEXT: <_start>: |
| // CHECK-ARM1-NEXT: 21000: 00 00 00 fa blx 0x21008 <thumbfunc> |
| // CHECK-ARM1-NEXT: 21004: 1e ff 2f e1 bx lr |
| .thumb |
| .section .text.2, "ax", %progbits |
| .globl thumbfunc |
| .type thumbfunc,%function |
| thumbfunc: |
| bl farthumbfunc |
| |
| // CHECK-THUMB1: <thumbfunc>: |
| // CHECK-THUMB1-NEXT: 21008: 00 f2 00 e8 blx 0x22100c <__ARMv5ABSLongThunk_farthumbfunc> |
| /// 6 Megabytes, enough to make farthumbfunc out of range of caller |
| /// on a v6 Arm, but not on a v7 Arm. |
| |
| .section .text.3, "ax", %progbits |
| .space 0x200000 |
| // CHECK-ARM2: <__ARMv5ABSLongThunk_farthumbfunc>: |
| // CHECK-ARM2-NEXT: 22100c: 04 f0 1f e5 ldr pc, [pc, #-4] |
| // CHECK-ARM2: <$d>: |
| // CHECK-ARM2-NEXT: 221010: 01 20 62 00 .word 0x00622001 |
| .section .text.4, "ax", %progbits |
| .space 0x200000 |
| |
| .section .text.5, "ax", %progbits |
| .space 0x200000 |
| |
| .thumb |
| .section .text.6, "ax", %progbits |
| .balign 0x1000 |
| .globl farthumbfunc |
| .type farthumbfunc,%function |
| farthumbfunc: |
| bx lr |
| // CHECK-THUMB2: <farthumbfunc>: |
| // CHECK-THUMB2-NEXT: 622000: 70 47 bx lr |