forked from OSchip/llvm-project
170 lines
6.4 KiB
ArmAsm
170 lines
6.4 KiB
ArmAsm
// REQUIRES: arm
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// RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi %s -o %t
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// RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi %S/Inputs/arm-exidx-cantunwind.s -o %tcantunwind
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// RUN: ld.lld --no-merge-exidx-entries %t %tcantunwind -o %t2 2>&1
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// RUN: llvm-objdump -d -triple=armv7a-none-linux-gnueabi %t2 | FileCheck %s
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// RUN: llvm-objdump -s -triple=armv7a-none-linux-gnueabi %t2 | FileCheck -check-prefix=CHECK-EXIDX %s
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// RUN: llvm-readobj --program-headers --sections %t2 | FileCheck -check-prefix=CHECK-PT %s
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// Use Linker script to place .ARM.exidx in between .text and orphan sections
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// RUN: echo "SECTIONS { \
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// RUN: .text 0x11000 : { *(.text*) } \
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// RUN: .ARM.exidx : { *(.ARM.exidx) } } " > %t.script
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// RUN: ld.lld --no-merge-exidx-entries --script %t.script %tcantunwind %t -o %t3 2>&1
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// RUN: llvm-objdump -d -triple=armv7a-none-linux-gnueabi %t3 | FileCheck -check-prefix=CHECK-SCRIPT %s
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// RUN: llvm-objdump -s -triple=armv7a-none-linux-gnueabi %t3 | FileCheck -check-prefix=CHECK-SCRIPT-EXIDX %s
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// Each assembler created .ARM.exidx section has the SHF_LINK_ORDER flag set
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// with the sh_link containing the section index of the executable section
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// containing the function it describes. The linker must combine the .ARM.exidx
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// InputSections in the same order that it has combined the executable section,
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// such that the combined .ARM.exidx OutputSection can be used as a binary
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// search table.
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.syntax unified
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.section .text, "ax",%progbits
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.globl _start
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_start:
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.fnstart
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bx lr
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.cantunwind
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.fnend
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.section .text.f1, "ax", %progbits
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.globl f1
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f1:
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.fnstart
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bx lr
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.cantunwind
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.fnend
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.section .text.f2, "ax", %progbits
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.globl f2
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f2:
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.fnstart
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bx lr
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.cantunwind
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.fnend
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.globl f3
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f3:
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.fnstart
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bx lr
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.cantunwind
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.fnend
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// Check default no linker script order.
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// CHECK: Disassembly of section .text:
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// CHECK: _start:
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// CHECK-NEXT: 11000: 1e ff 2f e1 bx lr
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// CHECK: f1:
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// CHECK-NEXT: 11004: 1e ff 2f e1 bx lr
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// CHECK: f2:
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// CHECK-NEXT: 11008: 1e ff 2f e1 bx lr
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// CHECK: f3:
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// CHECK-NEXT: 1100c: 1e ff 2f e1 bx lr
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// CHECK: func4:
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// CHECK-NEXT: 11010: 1e ff 2f e1 bx lr
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// CHECK: func5:
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// CHECK-NEXT: 11014: 1e ff 2f e1 bx lr
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// CHECK: Disassembly of section .func1:
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// CHECK-NEXT: func1:
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// CHECK-NEXT: 11018: 1e ff 2f e1 bx lr
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// CHECK: Disassembly of section .func2:
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// CHECK-NEXT: func2:
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// CHECK-NEXT: 1101c: 1e ff 2f e1 bx lr
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// CHECK: Disassembly of section .func3:
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// CHECK-NEXT: func3:
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// CHECK-NEXT: 11020: 1e ff 2f e1 bx lr
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// Each .ARM.exidx section has two 4 byte fields
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// Field 1 is the 31-bit offset to the function. The top bit is used to
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// indicate whether Field 2 is a pointer or an inline table entry.
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// Field 2 is either a pointer to a .ARM.extab section or an inline table
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// In this example all Field 2 entries are inline can't unwind (0x1)
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// We expect to see the entries in the same order as the functions
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// CHECK-EXIDX: Contents of section .ARM.exidx:
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// 100d4 + f2c = 11000 = _start
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// 100dc + f28 = 11004 = f1
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// CHECK-EXIDX-NEXT: 100d4 2c0f0000 01000000 280f0000 01000000
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// 100e4 + f24 = 11008 = f2
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// 100ec + f20 = 1100c = f3
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// CHECK-EXIDX-NEXT: 100e4 240f0000 01000000 200f0000 01000000
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// 100f4 + f1c = 11010 = func4
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// 100fc + f18 = 11014 = func5
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// CHECK-EXIDX-NEXT: 100f4 1c0f0000 01000000 180f0000 01000000
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// 10104 + f14 = 11018 = func1
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// 1010c + f10 = 1101c = func2
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// CHECK-EXIDX-NEXT: 10104 140f0000 01000000 100f0000 01000000
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// 10114 + f0c = 11020 = func3
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// CHECK-EXIDX-NEXT: 10114 0c0f0000 01000000
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// Check that PT_ARM_EXIDX program header has been generated that describes
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// the .ARM.exidx output section
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// CHECK-PT: Name: .ARM.exidx
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// CHECK-PT-NEXT: Type: SHT_ARM_EXIDX (0x70000001)
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// CHECK-PT-NEXT: Flags [
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// CHECK-PT-NEXT: SHF_ALLOC
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// CHECK-PT-NEXT: SHF_LINK_ORDER
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// CHECK-PT-NEXT: ]
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// CHECK-PT-NEXT: Address: 0x100D4
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// CHECK-PT-NEXT: Offset: 0xD4
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// CHECK-PT-NEXT: Size: 80
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// CHECK-PT: Type: PT_ARM_EXIDX (0x70000001)
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// CHECK-PT-NEXT: Offset: 0xD4
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// CHECK-PT-NEXT: VirtualAddress: 0x100D4
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// CHECK-PT-NEXT: PhysicalAddress: 0x100D4
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// CHECK-PT-NEXT: FileSize: 80
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// CHECK-PT-NEXT: MemSize: 80
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// CHECK-PT-NEXT: Flags [ (0x4)
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// CHECK-PT-NEXT: PF_R (0x4)
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// CHECK-PT-NEXT: ]
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// CHECK-PT-NEXT: Alignment: 4
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// CHECK-PT-NEXT: }
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// Check linker script order. The .ARM.exidx section will be inserted after
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// the .text section but before the orphan sections
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// CHECK-SCRIPT: Disassembly of section .text:
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// CHECK-SCRIPT-NEXT: func4:
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// CHECK-SCRIPT-NEXT: 11000: 1e ff 2f e1 bx lr
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// CHECK-SCRIPT: func5:
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// CHECK-SCRIPT-NEXT: 11004: 1e ff 2f e1 bx lr
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// CHECK-SCRIPT: _start:
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// CHECK-SCRIPT-NEXT: 11008: 1e ff 2f e1 bx lr
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// CHECK-SCRIPT: f1:
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// CHECK-SCRIPT-NEXT: 1100c: 1e ff 2f e1 bx lr
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// CHECK-SCRIPT: f2:
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// CHECK-SCRIPT-NEXT: 11010: 1e ff 2f e1 bx lr
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// CHECK-SCRIPT: f3:
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// CHECK-SCRIPT-NEXT: 11014: 1e ff 2f e1 bx lr
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// CHECK-SCRIPT-NEXT: Disassembly of section .func1:
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// CHECK-SCRIPT-NEXT: func1:
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// CHECK-SCRIPT-NEXT: 11018: 1e ff 2f e1 bx lr
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// CHECK-SCRIPT-NEXT: Disassembly of section .func2:
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// CHECK-SCRIPT-NEXT: func2:
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// CHECK-SCRIPT-NEXT: 1101c: 1e ff 2f e1 bx lr
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// CHECK-SCRIPT-NEXT: Disassembly of section .func3:
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// CHECK-SCRIPT-NEXT: func3:
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// CHECK-SCRIPT-NEXT: 11020: 1e ff 2f e1 bx lr
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// Check that the .ARM.exidx section is sorted in order as the functions
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// The offset in field 1, is 32-bit so in the binary the most significant bit
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// 11024 - 24 = 11000 func4
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// 1102c - 28 = 11004 func5
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// CHECK-SCRIPT-EXIDX: 11024 dcffff7f 01000000 d8ffff7f 01000000
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// 11034 - 2c = 11008 _start
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// 1103c - 30 = 1100c f1
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// CHECK-SCRIPT-EXIDX-NEXT: 11034 d4ffff7f 01000000 d0ffff7f 01000000
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// 11044 - 34 = 11010 f2
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// 1104c - 38 = 11014 f3
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// CHECK-SCRIPT-EXIDX-NEXT: 11044 ccffff7f 01000000 c8ffff7f 01000000
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// 11054 - 3c = 11018 func1
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// 1105c - 40 = 1101c func2
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// CHECK-SCRIPT-EXIDX-NEXT: 11054 c4ffff7f 01000000 c0ffff7f 01000000
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// 11064 - 44 = 11020 func3
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// 11068 - 48 = 11024 func3 + sizeof(func3)
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// CHECK-SCRIPT-EXIDX-NEXT: 11064 bcffff7f 01000000 b8ffff7f 01000000
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