lld/test/ELF/arm-branch.s

   1 /// Test the Arm state R_ARM_CALL and R_ARM_JUMP24 relocation to Arm state destinations.
   2 /// R_ARM_CALL is used for branch and link (BL)
   3 /// R_ARM_JUMP24 is used for unconditional and conditional branches (B and B<cc>)
   4 /// Relocations defined in https://github.com/ARM-software/abi-aa/blob/main/aaelf32/aaelf32.rst
   5 /// Addend A is always -8 to cancel out Arm state PC-bias of 8 bytes
   6
   7 // REQUIRES: arm
   8 // RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi %s -o %t
   9 // RUN: echo "SECTIONS { \
  10 // RUN:          . = 0xb4; \
  11 // RUN:          .callee1 : { *(.callee_low) } \
  12 // RUN:          .caller : { *(.text) } \
  13 // RUN:          .callee2 : { *(.callee_high) } } " > %t.script
  14 // RUN: ld.lld --defsym=far=0x201001c --script %t.script %t -o %t2
  15 // RUN: llvm-objdump -d --no-show-raw-insn --triple=armv7a-none-linux-gnueabi %t2 | FileCheck  %s
  16
  17  .syntax unified
  18  .section .callee_low, "ax",%progbits
  19  .align 2
  20  .type callee_low,%function
  21 callee_low:
  22  bx lr
  23
  24  .section .text, "ax",%progbits
  25  .globl _start
  26  .balign 0x10000
  27  .type _start,%function
  28 _start:
  29  bl  callee_low
  30  b   callee_low
  31  beq callee_low
  32  bl  callee_high
  33  b   callee_high
  34  bne callee_high
  35  bl  far
  36  b   far
  37  bgt far
  38  bx lr
  39
  40  .section .callee_high, "ax",%progbits
  41  .align 2
  42  .type callee_high,%function
  43 callee_high:
  44  bx lr
  45
  46 // CHECK: 00010000 <_start>:
  47 // CHECK-NEXT:   10000:       bl      0xb4 <callee_low>
  48 // CHECK-NEXT:   10004:       b       0xb4 <callee_low>
  49 // CHECK-NEXT:   10008:       beq     0xb4 <callee_low>
  50 // CHECK-NEXT:   1000c:       bl      0x10028 <callee_high>
  51 // CHECK-NEXT:   10010:       b       0x10028 <callee_high>
  52 // CHECK-NEXT:   10014:       bne     0x10028 <callee_high>
  53 /// 0x201001c = far
  54 // CHECK-NEXT:   10018:       bl      0x201001c
  55 // CHECK-NEXT:   1001c:       b       0x201001c
  56 // CHECK-NEXT:   10020:       bgt     0x201001c
  57 // CHECK-NEXT:   10024:       bx      lr