llvm-readobj: add support for ARM EHABI unwind info

This adds some preliminary support for decoding ARM EHABI unwinding information.
The major functionality that remains from complete support is bytecode
translation.

Each Unwind Index Table is printed out as a separate entity along with its
section index, name, offset, and entries.

Each entry lists the function address, and if possible, the name, of the
function to which it corresponds.  The encoding model, personality routine or
index, and byte code is also listed.

llvm-svn: 198734

1 files changed, 203 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-readobj/arm-unwind.s b/llvm/test/tools/llvm-readobj/arm-unwind.s
new file mode 100644
index 00000000000..7d23a05f1ad
--- /dev/null
+++ b/llvm/test/tools/llvm-readobj/arm-unwind.s
@@ -0,0 +1,203 @@
+@ RUN: llvm-mc -triple armv7-eabi -filetype obj -o - %s | llvm-readobj -u - \
+@ RUN:   | FileCheck %s
+
+	.syntax unified
+
+	.cpu cortex-a8
+	.fpu neon
+
+	.section .personality
+
+	.type __personality,%function
+__personality:
+	.fnstart
+	bkpt
+	.fnend
+
+
+	.section .personality0
+
+	.type personality0,%function
+personality0:
+	.fnstart
+	bx lr
+	.fnend
+
+
+	.section .personality1
+
+	.type personality1,%function
+personality1:
+	.fnstart
+	.pad #0x100
+	sub sp, sp, #0x100
+	.save {r0-r11}
+	push {r0-r11}
+	pop {r0-r11}
+	add sp, sp, #0x100
+	bx lr
+	.fnend
+
+
+	.section .custom_personality
+
+	.type custom_personality,%function
+custom_personality:
+	.fnstart
+	.personality __personality
+	bx lr
+	.fnend
+
+
+	.section .opcodes
+
+	.type opcodes,%function
+opcodes:
+	.fnstart
+	.vsave {d8-d12}
+	vpush {d8-d12}
+	vpop {d8-d12}
+	bx lr
+	.fnend
+
+
+	.section .multiple
+
+	.type function0,%function
+function0:
+	.fnstart
+	bx lr
+	.fnend
+
+	.type function1,%function
+function1:
+	.fnstart
+	.personality __personality
+	bx lr
+	.fnend
+
+	.type function2,%function
+function2:
+	.fnstart
+	bx lr
+	.fnend
+
+@ CHECK: UnwindInformation {
+@ CHECK:   UnwindIndexTable {
+@ CHECK:     SectionName: .ARM.exidx.personality
+@ CHECK:     Entries [
+@ CHECK:       Entry {
+@ CHECK:         FunctionAddress: 0x0
+@ CHECK:         FunctionName: __personality
+@ CHECK:         Model: Compact (Inline)
+@ CHECK:         PersonalityIndex: 0
+@ CHECK:         ByteCode [
+@ CHECK:           Instruction: 0xB0
+@ CHECK:           Instruction: 0xB0
+@ CHECK:           Instruction: 0xB0
+@ CHECK:         ]
+@ CHECK:       }
+@ CHECK:     ]
+@ CHECK:   }
+@ CHECK:   UnwindIndexTable {
+@ CHECK:     SectionName: .ARM.exidx.personality0
+@ CHECK:     Entries [
+@ CHECK:       Entry {
+@ CHECK:         FunctionAddress: 0x0
+@ CHECK:         FunctionName: personality0
+@ CHECK:         Model: Compact (Inline)
+@ CHECK:         PersonalityIndex: 0
+@ CHECK:         ByteCode [
+@ CHECK:           Instruction: 0xB0
+@ CHECK:           Instruction: 0xB0
+@ CHECK:           Instruction: 0xB0
+@ CHECK:         ]
+@ CHECK:       }
+@ CHECK:     ]
+@ CHECK:   }
+@ CHECK:   UnwindIndexTable {
+@ CHECK:     SectionName: .ARM.exidx.personality1
+@ CHECK:     Entries [
+@ CHECK:       Entry {
+@ CHECK:         FunctionAddress: 0x0
+@ CHECK:         FunctionName: personality1
+@ CHECK:         ExceptionHandlingTable: .ARM.extab.personality1
+@ CHECK:         TableEntryOffset: 0x0
+@ CHECK:         Model: Compact
+@ CHECK:         PersonalityIndex: 1
+@ CHECK:         ByteCode [
+@ CHECK:           Instruction: 0xB1
+@ CHECK:           Instruction: 0xF
+@ CHECK:           Instruction: 0xA7
+@ CHECK:           Instruction: 0x3F
+@ CHECK:           Instruction: 0xB0
+@ CHECK:           Instruction: 0xB0
+@ CHECK:         ]
+@ CHECK:       }
+@ CHECK:     ]
+@ CHECK:   }
+@ CHECK:   UnwindIndexTable {
+@ CHECK:     SectionName: .ARM.exidx.custom_personality
+@ CHECK:     Entries [
+@ CHECK:       Entry {
+@ CHECK:         FunctionAddress: 0x0
+@ CHECK:         FunctionName: custom_personality
+@ CHECK:         ExceptionHandlingTable: .ARM.extab.custom_personality
+@ CHECK:         TableEntryOffset: 0x0
+@ CHECK:         Model: Generic
+@ CHECK:         PersonalityRoutineAddress: 0x0
+@ CHECK:       }
+@ CHECK:     ]
+@ CHECK:   }
+@ CHECK:   UnwindIndexTable {
+@ CHECK:     SectionName: .ARM.exidx.opcodes
+@ CHECK:     Entries [
+@ CHECK:       Entry {
+@ CHECK:         FunctionAddress: 0x0
+@ CHECK:         FunctionName: opcodes
+@ CHECK:         Model: Compact (Inline)
+@ CHECK:         PersonalityIndex: 0
+@ CHECK:         ByteCode [
+@ CHECK:           Instruction: 0xC9
+@ CHECK:           Instruction: 0x84
+@ CHECK:           Instruction: 0xB0
+@ CHECK:         ]
+@ CHECK:       }
+@ CHECK:     ]
+@ CHECK:   }
+@ CHECK:   UnwindIndexTable {
+@ CHECK:     SectionName: .ARM.exidx.multiple
+@ CHECK:     Entries [
+@ CHECK:       Entry {
+@ CHECK:         FunctionAddress: 0x0
+@ CHECK:         FunctionName: function0
+@ CHECK:         Model: Compact (Inline)
+@ CHECK:         PersonalityIndex: 0
+@ CHECK:         ByteCode [
+@ CHECK:           Instruction: 0xB0
+@ CHECK:           Instruction: 0xB0
+@ CHECK:           Instruction: 0xB0
+@ CHECK:         ]
+@ CHECK:       }
+@ CHECK:       Entry {
+@ CHECK:         FunctionAddress: 0x4
+@ CHECK:         FunctionName: function1
+@ CHECK:         ExceptionHandlingTable: .ARM.extab.multiple
+@ CHECK:         Model: Generic
+@ CHECK:         PersonalityRoutineAddress: 0x0
+@ CHECK:       }
+@ CHECK:       Entry {
+@ CHECK:         FunctionAddress: 0x8
+@ CHECK:         FunctionName: function2
+@ CHECK:         Model: Compact (Inline)
+@ CHECK:         PersonalityIndex: 0
+@ CHECK:         ByteCode [
+@ CHECK:           Instruction: 0xB0
+@ CHECK:           Instruction: 0xB0
+@ CHECK:           Instruction: 0xB0
+@ CHECK:         ]
+@ CHECK:       }
+@ CHECK:     ]
+@ CHECK:   }
+@ CHECK: }
+