| // REQUIRES: arm |
| // RUN: rm -rf %t && split-file %s %t |
| // RUN: llvm-mc -arm-add-build-attributes -filetype=obj -triple=armv6m-none-eabi %t/a.s -o %t/a.o |
| // RUN: ld.lld --no-rosegment --script %t/a.t %t/a.o -o %t/a |
| // RUN: llvm-objdump --no-print-imm-hex --no-show-raw-insn -d %t/a --triple=armv6m-none-eabi | FileCheck %s |
| // RUN: not ld.lld --no-rosegment --script %t/a.t %t/a.o -o %t/a2 --pie 2>&1 | FileCheck --check-prefix=CHECK-PI %s |
| // RUN: rm -f %t/a %t/a2 |
| |
| // Range extension thunks for Arm Architecture v6m. Only Thumb instructions |
| // are permitted which limits the access to instructions that can access the |
| // high registers (r8 - r15), this means that the thunks have to spill |
| // low registers (r0 - r7) in order to perform the transfer of control. |
| |
| //--- a.t |
| SECTIONS { |
| .text_low 0x11345670 : { *(.text_low) } |
| .text_high 0x12345678 : { *(.text_high) } |
| } |
| |
| //--- a.s |
| // The 'y' on the .section directive means that this section is eXecute Only code |
| .syntax unified |
| .section .text_low, "axy", %progbits |
| .thumb |
| .type _start, %function |
| .balign 4 |
| .globl _start |
| _start: |
| bl far |
| |
| .section .text_high, "ax", %progbits |
| .globl far |
| .type far, %function |
| far: |
| bx lr |
| |
| // CHECK: Disassembly of section .text_low: |
| // CHECK-EMPTY: |
| // CHECK-NEXT: <_start>: |
| // CHECK-NEXT: 11345670: bl 0x11345674 <__Thumbv6MABSXOLongThunk_far> |
| // CHECK: <__Thumbv6MABSXOLongThunk_far>: |
| // CHECK-NEXT: push {r0, r1} |
| // CHECK-NEXT: movs r0, #18 |
| // CHECK-NEXT: lsls r0, r0, #8 |
| // CHECK-NEXT: adds r0, #52 |
| // CHECK-NEXT: lsls r0, r0, #8 |
| // CHECK-NEXT: adds r0, #86 |
| // CHECK-NEXT: lsls r0, r0, #8 |
| // CHECK-NEXT: adds r0, #121 |
| // CHECK-NEXT: str r0, [sp, #4] |
| // CHECK-NEXT: pop {r0, pc} |
| // CHECK: Disassembly of section .text_high: |
| // CHECK-EMPTY: |
| // CHECK-NEXT: <far>: |
| // CHECK-NEXT: 12345678: bx lr |
| |
| // CHECK-PI: error: relocation R_ARM_THM_CALL to far not supported for Armv6-M targets for position independent and execute only code |
