diff options
Diffstat (limited to 'test/ELF/arm-thumb-thunk-v6m.s')
| -rw-r--r-- | test/ELF/arm-thumb-thunk-v6m.s | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/test/ELF/arm-thumb-thunk-v6m.s b/test/ELF/arm-thumb-thunk-v6m.s new file mode 100644 index 0000000000000..bf5afd5edfee6 --- /dev/null +++ b/test/ELF/arm-thumb-thunk-v6m.s @@ -0,0 +1,61 @@ +// REQUIRES: arm +// RUN: llvm-mc -arm-add-build-attributes -filetype=obj -triple=armv6m-none-eabi %s -o %t +// RUN: echo "SECTIONS { \ +// RUN: . = SIZEOF_HEADERS; \ +// RUN: .text_low : { *(.text_low) *(.text_low2) } \ +// RUN: .text_high 0x2000000 : { *(.text_high) *(.text_high2) } \ +// RUN: } " > %t.script +// RUN: ld.lld --script %t.script %t -o %t2 +// RUN: llvm-objdump -d %t2 -triple=armv6m-none-eabi | FileCheck %s +// RUN: ld.lld --script %t.script %t -o %t3 --pie +// RUN: llvm-objdump -d %t3 -triple=armv6m-none-eabi | FileCheck -check-prefix=CHECK-PI %s + +// Range extension thunks for Arm Architecture v6m. Only Thumb instructions +// are permitted which limits the access to instructions that can access the +// high registers (r8 - r15), this means that the thunks have to spill +// low registers (r0 - r7) in order to perform the transfer of control. + + .syntax unified + .section .text_low, "ax", %progbits + .thumb + .type _start, %function + .balign 4 + .globl _start +_start: + bl far + + .section .text_high, "ax", %progbits + .globl far + .type far, %function +far: + bx lr + +// CHECK: Disassembly of section .text_low: +// CHECK-NEXT: _start: +// CHECK-NEXT: 94: 00 f0 00 f8 bl #0 +// CHECK: __Thumbv6MABSLongThunk_far: +// CHECK-NEXT: 98: 03 b4 push {r0, r1} +// CHECK-NEXT: 9a: 01 48 ldr r0, [pc, #4] +// CHECK-NEXT: 9c: 01 90 str r0, [sp, #4] +// CHECK-NEXT: 9e: 01 bd pop {r0, pc} +// CHECK: a0: 01 00 00 02 .word 0x02000001 +// CHECK: Disassembly of section .text_high: +// CHECK-NEXT: far: +// CHECK-NEXT: 2000000: 70 47 bx lr + +// CHECK-PI: Disassembly of section .text_low: +// CHECK-PI-NEXT: _start: +// CHECK-PI-NEXT: 130: 00 f0 00 f8 bl #0 +// CHECK-PI: __Thumbv6MPILongThunk_far: +// CHECK-PI-NEXT: 134: 01 b4 push {r0} +// CHECK-PI-NEXT: 136: 02 48 ldr r0, [pc, #8] +// CHECK-PI-NEXT: 138: 84 46 mov r12, r0 +// CHECK-PI-NEXT: 13a: 01 bc pop {r0} +// pc = pc (0x13c + 4) + r12 (1fffec1) = 0x2000001 = .far +// CHECK-PI-NEXT: 13c: e7 44 add pc, r12 +// CHECK-PI-NEXT: 13e: c0 46 mov r8, r8 +// CHECK-PI: 140: c1 fe ff 01 .word 0x01fffec1 + +// CHECK-PI: Disassembly of section .text_high: +// CHECK-PI-NEXT: far: +// CHECK-PI-NEXT: 2000000: 70 47 bx lr |