test/ELF/arm-fix-cortex-a8-thunk.s

// REQUIRES: arm
// RUN: llvm-mc -filetype=obj -triple=armv7a-linux-gnueabihf --arm-add-build-attributes %s -o %t.o
// RUN: echo "SECTIONS { \
// RUN:          .text0 0x011006 : { *(.text.00) } \
// RUN:          .text1 0x110000 : { *(.text.01) *(.text.02) *(.text.03) \
// RUN:                             *(.text.04) } \
// RUN:          .text2 0x210000 : { *(.text.05) } } " > %t.script
// RUN: ld.lld --script %t.script --fix-cortex-a8 --shared -verbose %t.o -o %t2 2>&1
// RUN: llvm-objdump -d --no-show-raw-insn --start-address=0x110000 --stop-address=0x110010 %t2 | FileCheck --check-prefix=THUNK %s
// RUN: llvm-objdump -d --no-show-raw-insn --start-address=0x110ffa --stop-address=0x111008 %t2 | FileCheck --check-prefix=PATCH %s
// RUN: llvm-objdump -d --no-show-raw-insn --start-address=0x111008 --stop-address=0x111010 %t2 | FileCheck --check-prefix=THUNK2 %s

/// Test cases for Cortex-a8 Erratum 657417 that involve interactions with
/// range extension thunks. Both erratum fixes and range extension thunks need
/// precise information and after creation alter address information.
 .thumb

 .section .text.00, "ax", %progbits
 .thumb_func
early:
 bx lr

 .section .text.01, "ax", %progbits
 .balign 4096
 .globl _start
 .type _start, %function
_start:
  beq.w far_away
/// Thunk to far_away and state change needed, size 12-bytes goes here.
// THUNK:      00110000 _start:
// THUNK-NEXT:   110000:        beq.w   #0 <__ThumbV7PILongThunk_far_away+0x4>
// THUNK:      00110004 __ThumbV7PILongThunk_far_away:
// THUNK-NEXT:   110004:        movw    r12, #65524
// THUNK-NEXT:   110008:        movt    r12, #15
// THUNK-NEXT:   11000c:        add     r12, pc
// THUNK-NEXT:   11000e:        bx      r12

 .section .text.02, "ax", %progbits
 .space 4096 - 22

 .section .text.03, "ax", %progbits
 .thumb_func
target:
/// After thunk is added this branch will line up across 2 4 KiB regions
/// and will trigger a patch.
 nop.w
 bl target

/// Expect erratum patch inserted here
// PATCH:      00110ffa target:
// PATCH-NEXT:   110ffa:        nop.w
// PATCH-NEXT:   110ffe:        bl      #2
// PATCH:      00111004 __CortexA8657417_110FFE:
// PATCH-NEXT:   111004:        b.w     #-14

// THUNK2: 00111008 __ThumbV7PILongThunk_early:
// THUNK2-NEXT:   111008:       b.w     #-1048582
 .section .text.04, "ax", %progbits
/// The erratum patch will push this branch out of range, so another
/// range extension thunk will be needed.
 beq.w early
// THUNK2-NEXT  11100c:         beq.w   #-8
/// Expect range extension thunk here.
 .section .text.05, "ax", %progbits
 .arm
 nop
 .type far_away, %function
far_away:
  bx lr