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150
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1 // REQUIRES: arm
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2 // RUN: llvm-mc -filetype=obj -triple=thumbv7a-none-linux-gnueabi %s -o %t
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3 // RUN: llvm-mc -filetype=obj -triple=thumbv7a-none-linux-gnueabi %S/Inputs/arm-thumb-blx-targets.s -o %ttarget
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4 // RUN: echo "SECTIONS { \
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5 // RUN: .R_ARM_CALL24_callee1 : { *(.R_ARM_CALL24_callee_low) } \
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6 // RUN: .R_ARM_CALL24_callee2 : { *(.R_ARM_CALL24_callee_thumb_low) } \
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7 // RUN: .caller : { *(.text) } \
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8 // RUN: .R_ARM_CALL24_callee3 : { *(.R_ARM_CALL24_callee_high) } \
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9 // RUN: .R_ARM_CALL24_callee4 : { *(.R_ARM_CALL24_callee_thumb_high) } } " > %t.script
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10 // RUN: ld.lld --script %t.script %t %ttarget -o %t2
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236
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11 // RUN: llvm-objdump -d %t2 | FileCheck %s
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150
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12 // Test BLX instruction is chosen for Thumb BL/BLX instruction and ARM callee
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13 // 2 byte nops are used to test the pc-rounding behaviour. As a BLX from a
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14 // 2 byte aligned destination is defined as Align(PC,4) + immediate:00
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15 // FIXME: llvm-mc has problems assembling BLX unless the destination is
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16 // external. The targets of the BL and BLX instructions are in arm-thumb-blx-target.s
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17 .syntax unified
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18 .section .text, "ax",%progbits
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19 .thumb
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20 .globl _start
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21 .balign 0x10000
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22 .type _start,%function
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23 _start:
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24 blx callee_low
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25 nop
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26 bl callee_low
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27 nop
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28 blx callee_high
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29 nop
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30 bl callee_high
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31 nop
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32 blx blx_far
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33 nop
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34 bl blx_far
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35 nop
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36 // Expect BLX to thumb target to be written out as a BL
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37 blx callee_thumb_low
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38 nop
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39 blx callee_thumb_high
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40 bx lr
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41
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42 // CHECK: Disassembly of section .R_ARM_CALL24_callee1:
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43 // CHECK-EMPTY:
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44 // CHECK-NEXT-ARM: callee_low:
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45 // CHECK-NEXT-ARM: b4: 1e ff 2f e1 bx lr
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46
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47 // CHECK: Disassembly of section .R_ARM_CALL24_callee2:
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48 // CHECK-EMPTY:
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49 // CHECK-NEXT-THUMB: callee_thumb_low:
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50 // CHECK-NEXT-THUMB: 100: 70 47 bx lr
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51
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52 // CHECK: Disassembly of section .caller:
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53 // CHECK-EMPTY:
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173
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54 // CHECK: <_start>:
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150
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55 // Align(0x10000,4) - 0xff50 (65360) + 4 = 0xb4 = callee_low
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56 // CHECK-NEXT-THUMB: 10000: f0 f7 58 e8 blx #-65360
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57 // CHECK-NEXT-THUMB: 10004: 00 bf nop
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58 // Align(0x10006,4) - 0xff54 (65364) + 4 = 0xb4 = callee_low
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59 // CHECK-NEXT-THUMB: 10006: f0 f7 56 e8 blx #-65364
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60 // CHECK-NEXT-THUMB: 1000a: 00 bf nop
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61 // Align(0x1000c,4) + 0xf0 (240) + 4 = 0x10100 = callee_high
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62 // CHECK-NEXT-THUMB: 1000c: 00 f0 78 e8 blx #240
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63 // CHECK-NEXT-THUMB: 10010: 00 bf nop
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64 // Align(0x10012,4) + 0xec (236) + 4 = 0x10100 = callee_high
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65 // CHECK-NEXT-THUMB: 10012: 00 f0 76 e8 blx #236
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66 // CHECK-NEXT-THUMB: 10016: 00 bf nop
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67 // Align(0x10018,4) + 0xfffffc (16777212) = 0x1010018 = blx_far
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68 // CHECK-NEXT-THUMB: 10018: ff f3 fe c7 blx #16777212
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69 // CHECK-NEXT-THUMB: 1001c: 00 bf nop
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70 // Align(0x1001e,4) + 0xfffff8 (16777208) = 0x1010018 = blx_far
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71 // CHECK-NEXT-THUMB: 1001e: ff f3 fc c7 blx #16777208
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72 // CHECK-NEXT-THUMB: 10022: 00 bf nop
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73 // 10024 - 0xff28 (65320) + 4 = 0x100 = callee_thumb_low
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74 // CHECK-NEXT-THUMB: 10024: f0 f7 6c f8 bl #-65320
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75 // CHECK-NEXT-THUMB: 10028: 00 bf nop
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76 // 1002a + 0x1d2 (466) + 4 = 0x10200 = callee_thumb_high
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77 // CHECK-NEXT-THUMB: 1002a: 00 f0 e9 f8 bl #466
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78 // CHECK-NEXT-THUMB: 1002e: 70 47 bx lr
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79
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80
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81 // CHECK: Disassembly of section .R_ARM_CALL24_callee3:
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82 // CHECK-EMPTY:
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83 // CHECK-NEXT-ARM: callee_high:
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84 // CHECK-NEXT-ARM: 10100: 1e ff 2f e1 bx lr
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85
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86 // CHECK: Disassembly of section .R_ARM_CALL24_callee4:
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87 // CHECK-EMPTY:
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88 // CHECK-NEXT-THUMB:callee_thumb_high:
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89 // CHECK-NEXT-THUMB: 10200: 70 47 bx lr
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