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Most Arm disassemblers, including GNU objdump and Arm's own `fromelf`, emit an instruction's raw encoding as a 32-bit words or (for Thumb) one or two 16-bit halfwords, in logical order rather than according to their storage endianness. This is generally easier to read: it matches the encoding diagrams in the architecture spec, it matches the value you'd write in a `.inst` directive, and it means that fields within the instruction encoding that span more than one byte (such as branch offsets or `SVC` immediates) can be read directly in the encoding without having to mentally reverse the bytes. llvm-objdump already has a system of PrettyPrinter subclasses which makes it easy for a target to drop in its own preferred formatting. This patch adds pretty-printers for all the Arm targets, so that llvm-objdump will display Arm instruction encodings in their preferred layout instead of little-endian and bytewise. Reviewed By: DavidSpickett Differential Revision: https://reviews.llvm.org/D130358
70 lines
1.7 KiB
ArmAsm
70 lines
1.7 KiB
ArmAsm
// REQUIRES: arm
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// RUN: llvm-mc -arm-add-build-attributes -filetype=obj -triple=thumbv7a-none-linux-gnueabi %s -o %t
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// RUN: echo "SECTIONS { \
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// RUN: .text 0x100000 : { *(SORT_BY_NAME(.text.*)) } \
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// RUN: }" > %t.script
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// RUN: ld.lld --script %t.script %t -o %t2
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// RUN: llvm-objdump -d %t2 --start-address=0x100000 --stop-address=0x100008 | FileCheck --check-prefix=CHECK1 %s
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// RUN: llvm-objdump -d %t2 --start-address=0x1000004 --stop-address=0x100000e | FileCheck --check-prefix=CHECK2 %s
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.syntax unified
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// Test that linkerscript sorting does not apply to Thunks, we expect that the
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// sort will reverse the order of sections presented here.
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// Define a function aligned on a megabyte boundary
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.macro FUNCTION suff
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.section .text.\suff\(), "ax", %progbits
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.thumb
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.balign 0x100000
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.globl tfunc\suff\()
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.type tfunc\suff\(), %function
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tfunc\suff\():
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bx lr
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.endm
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FUNCTION 31
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FUNCTION 30
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FUNCTION 29
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FUNCTION 28
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FUNCTION 27
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FUNCTION 26
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FUNCTION 25
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FUNCTION 24
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FUNCTION 23
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FUNCTION 22
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FUNCTION 21
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FUNCTION 20
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FUNCTION 19
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FUNCTION 18
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FUNCTION 17
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FUNCTION 16
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FUNCTION 15
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// CHECK2: <__Thumbv7ABSLongThunk_tfunc31>:
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// CHECK2-NEXT: 1000004: f3ff 97fc b.w 0x2000000 <tfunc31>
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FUNCTION 14
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FUNCTION 13
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FUNCTION 12
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FUNCTION 11
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FUNCTION 10
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FUNCTION 09
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FUNCTION 08
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FUNCTION 07
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FUNCTION 06
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FUNCTION 05
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FUNCTION 04
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FUNCTION 03
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FUNCTION 02
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FUNCTION 01
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.section .text.00, "ax", %progbits
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.thumb
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.globl _start
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_start:
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// Expect no range extension needed for tfunc01 and an extension needed for
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// tfunc31
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bl tfunc01
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bl tfunc31
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// CHECK1: <_start>:
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// CHECK1-NEXT: 100000: f0ff fffe bl 0x200000 <tfunc01>
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// CHECK1-NEXT: 100004: f2ff d7fe bl 0x1000004 <__Thumbv7ABSLongThunk_tfunc31>
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