| // REQUIRES: arm |
| // RUN: llvm-mc -filetype=obj -triple=thumbv7a-none-linux-gnueabi %s -o %t |
| // RUN: llvm-mc -filetype=obj -triple=thumbv7a-none-linux-gnueabi %S/Inputs/arm-thumb-blx-targets.s -o %ttarget |
| // RUN: echo "SECTIONS { \ |
| // RUN: .R_ARM_CALL24_callee1 : { *(.R_ARM_CALL24_callee_low) } \ |
| // RUN: .R_ARM_CALL24_callee2 : { *(.R_ARM_CALL24_callee_thumb_low) } \ |
| // RUN: .caller : { *(.text) } \ |
| // RUN: .R_ARM_CALL24_callee3 : { *(.R_ARM_CALL24_callee_high) } \ |
| // RUN: .R_ARM_CALL24_callee4 : { *(.R_ARM_CALL24_callee_thumb_high) } } " > %t.script |
| // RUN: ld.lld --script %t.script %t %ttarget -o %t2 |
| // RUN: llvm-objdump -d %t2 | FileCheck %s |
| // Test BLX instruction is chosen for Thumb BL/BLX instruction and ARM callee |
| // 2 byte nops are used to test the pc-rounding behaviour. As a BLX from a |
| // 2 byte aligned destination is defined as Align(PC,4) + immediate:00 |
| // FIXME: llvm-mc has problems assembling BLX unless the destination is |
| // external. The targets of the BL and BLX instructions are in arm-thumb-blx-target.s |
| .syntax unified |
| .section .text, "ax",%progbits |
| .thumb |
| .globl _start |
| .balign 0x10000 |
| .type _start,%function |
| _start: |
| blx callee_low |
| nop |
| bl callee_low |
| nop |
| blx callee_high |
| nop |
| bl callee_high |
| nop |
| blx blx_far |
| nop |
| bl blx_far |
| nop |
| // Expect BLX to thumb target to be written out as a BL |
| blx callee_thumb_low |
| nop |
| blx callee_thumb_high |
| bx lr |
| |
| // CHECK: Disassembly of section .R_ARM_CALL24_callee1: |
| // CHECK-EMPTY: |
| // CHECK-NEXT-ARM: callee_low: |
| // CHECK-NEXT-ARM: b4: 1e ff 2f e1 bx lr |
| |
| // CHECK: Disassembly of section .R_ARM_CALL24_callee2: |
| // CHECK-EMPTY: |
| // CHECK-NEXT-THUMB: callee_thumb_low: |
| // CHECK-NEXT-THUMB: 100: 70 47 bx lr |
| |
| // CHECK: Disassembly of section .caller: |
| // CHECK-EMPTY: |
| // CHECK: <_start>: |
| // Align(0x10000,4) - 0xff50 (65360) + 4 = 0xb4 = callee_low |
| // CHECK-NEXT-THUMB: 10000: f0 f7 58 e8 blx #-65360 |
| // CHECK-NEXT-THUMB: 10004: 00 bf nop |
| // Align(0x10006,4) - 0xff54 (65364) + 4 = 0xb4 = callee_low |
| // CHECK-NEXT-THUMB: 10006: f0 f7 56 e8 blx #-65364 |
| // CHECK-NEXT-THUMB: 1000a: 00 bf nop |
| // Align(0x1000c,4) + 0xf0 (240) + 4 = 0x10100 = callee_high |
| // CHECK-NEXT-THUMB: 1000c: 00 f0 78 e8 blx #240 |
| // CHECK-NEXT-THUMB: 10010: 00 bf nop |
| // Align(0x10012,4) + 0xec (236) + 4 = 0x10100 = callee_high |
| // CHECK-NEXT-THUMB: 10012: 00 f0 76 e8 blx #236 |
| // CHECK-NEXT-THUMB: 10016: 00 bf nop |
| // Align(0x10018,4) + 0xfffffc (16777212) = 0x1010018 = blx_far |
| // CHECK-NEXT-THUMB: 10018: ff f3 fe c7 blx #16777212 |
| // CHECK-NEXT-THUMB: 1001c: 00 bf nop |
| // Align(0x1001e,4) + 0xfffff8 (16777208) = 0x1010018 = blx_far |
| // CHECK-NEXT-THUMB: 1001e: ff f3 fc c7 blx #16777208 |
| // CHECK-NEXT-THUMB: 10022: 00 bf nop |
| // 10024 - 0xff28 (65320) + 4 = 0x100 = callee_thumb_low |
| // CHECK-NEXT-THUMB: 10024: f0 f7 6c f8 bl #-65320 |
| // CHECK-NEXT-THUMB: 10028: 00 bf nop |
| // 1002a + 0x1d2 (466) + 4 = 0x10200 = callee_thumb_high |
| // CHECK-NEXT-THUMB: 1002a: 00 f0 e9 f8 bl #466 |
| // CHECK-NEXT-THUMB: 1002e: 70 47 bx lr |
| |
| |
| // CHECK: Disassembly of section .R_ARM_CALL24_callee3: |
| // CHECK-EMPTY: |
| // CHECK-NEXT-ARM: callee_high: |
| // CHECK-NEXT-ARM: 10100: 1e ff 2f e1 bx lr |
| |
| // CHECK: Disassembly of section .R_ARM_CALL24_callee4: |
| // CHECK-EMPTY: |
| // CHECK-NEXT-THUMB:callee_thumb_high: |
| // CHECK-NEXT-THUMB: 10200: 70 47 bx lr |
