arm-fix-cortex-a8-thunk.s
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// 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 %t2 | FileCheck %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.
// CHECK: 00110004 <__ThumbV7PILongThunk_far_away>:
// CHECK-NEXT: 110004: movw r12, #65524
// CHECK-NEXT: movt r12, #15
// CHECK-NEXT: add r12, pc
// CHECK-NEXT: 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
// CHECK: 00110ffa <target>:
// CHECK-NEXT: 110ffa: nop.w
// CHECK-NEXT: bl #2
// CHECK: 00111004 <__CortexA8657417_110FFE>:
// CHECK-NEXT: 111004: b.w #-14
/// Expect range extension thunk here.
// CHECK: 00111008 <__ThumbV7PILongThunk_early>:
// CHECK-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
// CHECK: 11100c: beq.w #-8
.section .text.05, "ax", %progbits
.arm
nop
.type far_away, %function
far_away:
bx lr