forked from OSchip/llvm-project
66 lines
2.5 KiB
ArmAsm
66 lines
2.5 KiB
ArmAsm
// REQUIRES: arm
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// RUN: llvm-mc -arm-add-build-attributes -filetype=obj -triple=armv6m-none-eabi %s -o %t
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// RUN: echo "SECTIONS { \
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// RUN: . = SIZEOF_HEADERS; \
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// RUN: .text_low : { *(.text_low) *(.text_low2) } \
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// RUN: .text_high 0x2000000 : { *(.text_high) *(.text_high2) } \
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// RUN: } " > %t.script
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// RUN: ld.lld --no-rosegment --script %t.script %t -o %t2
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// RUN: llvm-objdump -d %t2 --triple=armv6m-none-eabi | FileCheck %s
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// RUN: ld.lld --no-rosegment --script %t.script %t -o %t3 --pie
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// RUN: llvm-objdump -d %t3 --triple=armv6m-none-eabi | FileCheck --check-prefix=CHECK-PI %s
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// Range extension thunks for Arm Architecture v6m. Only Thumb instructions
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// are permitted which limits the access to instructions that can access the
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// high registers (r8 - r15), this means that the thunks have to spill
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// low registers (r0 - r7) in order to perform the transfer of control.
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.syntax unified
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.section .text_low, "ax", %progbits
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.thumb
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.type _start, %function
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.balign 4
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.globl _start
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_start:
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bl far
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.section .text_high, "ax", %progbits
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.globl far
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.type far, %function
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far:
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bx lr
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// CHECK: Disassembly of section .text_low:
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// CHECK-EMPTY:
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// CHECK-NEXT: <_start>:
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// CHECK-NEXT: 94: 00 f0 00 f8 bl 0x98 <__Thumbv6MABSLongThunk_far>
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// CHECK: <__Thumbv6MABSLongThunk_far>:
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// CHECK-NEXT: 98: 03 b4 push {r0, r1}
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// CHECK-NEXT: 9a: 01 48 ldr r0, [pc, #4]
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// CHECK-NEXT: 9c: 01 90 str r0, [sp, #4]
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// CHECK-NEXT: 9e: 01 bd pop {r0, pc}
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// CHECK: a0: 01 00 00 02 .word 0x02000001
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// CHECK: Disassembly of section .text_high:
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// CHECK-EMPTY:
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// CHECK-NEXT: <far>:
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// CHECK-NEXT: 2000000: 70 47 bx lr
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// CHECK-PI: Disassembly of section .text_low:
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// CHECK-PI-EMPTY:
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// CHECK-PI-NEXT: <_start>:
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// CHECK-PI-NEXT: 130: 00 f0 00 f8 bl 0x134 <__Thumbv6MPILongThunk_far>
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// CHECK-PI: <__Thumbv6MPILongThunk_far>:
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// CHECK-PI-NEXT: 134: 01 b4 push {r0}
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// CHECK-PI-NEXT: 136: 02 48 ldr r0, [pc, #8]
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// CHECK-PI-NEXT: 138: 84 46 mov r12, r0
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// CHECK-PI-NEXT: 13a: 01 bc pop {r0}
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// pc = pc (0x13c + 4) + r12 (1fffec1) = 0x2000001 = .far
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// CHECK-PI-NEXT: 13c: e7 44 add pc, r12
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// CHECK-PI-NEXT: 13e: c0 46 mov r8, r8
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// CHECK-PI: 140: c1 fe ff 01 .word 0x01fffec1
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// CHECK-PI: Disassembly of section .text_high:
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// CHECK-PI-EMPTY:
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// CHECK-PI-NEXT: <far>:
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// CHECK-PI-NEXT: 2000000: 70 47 bx lr
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