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fa2266ded0
Changes to ARM unwind opcode assembler:
* Fix multiple .save or .vsave directives. Besides, the
order is preserved now.
* For the directives which will generate multiple opcodes,
such as ".save {r0-r11}", the order of the unwind opcode
is fixed now, i.e. the registers with less encoding value
are popped first.
* Fix the $sp offset calculation. Now, we can use the
.setfp, .pad, .save, and .vsave directives at any order.
Changes to test cases:
* Add test cases to check the order of multiple opcodes
for the .save directive.
* Fix the incorrect $sp offset in the test case. The
stack pointer offset specified in the test case was
incorrect. (Changed test cases: ehabi-mc-section.ll and
ehabi-mc.ll)
* The opcode to restore $sp are slightly reordered. The
behavior are not changed, and the new output is same
as the output of GNU as. (Changed test cases:
eh-directive-pad.s and eh-directive-setfp.s)
llvm-svn: 183627
240 lines
6.2 KiB
ArmAsm
240 lines
6.2 KiB
ArmAsm
@ RUN: llvm-mc %s -triple=armv7-unknown-linux-gnueabi -filetype=obj -o - \
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@ RUN: | llvm-readobj -s -sd | FileCheck %s
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@ Check for .setfp directive.
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@ The .setfp directive will track the offset between the frame pointer and
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@ the stack pointer. This is required for the function that will change
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@ the stack pointer out of the function prologue. If the exception is thrown,
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@ then libunwind will reconstruct the stack pointer from the frame pointer.
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@ The reconstruction code is implemented by two different unwind opcode:
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@ (i) the unwind opcode to copy stack offset from the other register, and
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@ (ii) the unwind opcode to add or substract the stack offset.
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@
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@ This file includes several cases separated by different range of -offset
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@
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@ (-offset) < 0x00
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@ (-offset) == 0x00
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@ 0x04 <= (-offset) <= 0x100
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@ 0x104 <= (-offset) <= 0x200
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@ 0x204 <= (-offset)
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.syntax unified
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@-------------------------------------------------------------------------------
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@ TEST1
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@-------------------------------------------------------------------------------
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.section .TEST1
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.globl func1
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.align 2
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.type func1,%function
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.fnstart
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func1:
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.setfp fp, sp, #0
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add fp, sp, #0
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sub sp, fp, #0
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bx lr
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.personality __gxx_personality_v0
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.handlerdata
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.fnend
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@-------------------------------------------------------------------------------
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@ The assembler should emit 0x9B to copy stack pointer from r11.
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@-------------------------------------------------------------------------------
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@ CHECK: Section {
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@ CHECK: Name: .ARM.extab.TEST1
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@ CHECK: SectionData (
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@ CHECK: 0000: 00000000 B0B09B00 |........|
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@ CHECK: )
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@ CHECK: }
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@-------------------------------------------------------------------------------
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@ TEST2
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@-------------------------------------------------------------------------------
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.section .TEST2
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.globl func2a
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.align 2
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.type func2a,%function
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.fnstart
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func2a:
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.setfp fp, sp, #-4
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add fp, sp, #4
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sub sp, fp, #4
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bx lr
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.personality __gxx_personality_v0
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.handlerdata
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.fnend
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.globl func2b
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.align 2
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.type func2b,%function
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.fnstart
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func2b:
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.setfp fp, sp, #-0x100
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add fp, sp, #0x100
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sub sp, fp, #0x100
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bx lr
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.personality __gxx_personality_v0
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.handlerdata
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.fnend
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@-------------------------------------------------------------------------------
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@ The assembler should emit 0x9B to copy stack pointer from r11.
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@ The assembler should emit ((-offset - 4) >> 2) for offset.
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@-------------------------------------------------------------------------------
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@ CHECK: Section {
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@ CHECK: Name: .ARM.extab.TEST2
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@ CHECK: SectionData (
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@ CHECK: 0000: 00000000 B0009B00 00000000 B03F9B00 |.............?..|
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@ CHECK: )
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@ CHECK: }
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@-------------------------------------------------------------------------------
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@ TEST3
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@-------------------------------------------------------------------------------
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.section .TEST3
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.globl func3a
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.align 2
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.type func3a,%function
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.fnstart
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func3a:
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.setfp fp, sp, #-0x104
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sub fp, sp, #0x104
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add sp, fp, #0x104
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bx lr
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.personality __gxx_personality_v0
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.handlerdata
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.fnend
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.globl func3b
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.align 2
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.type func3b,%function
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.fnstart
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func3b:
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.setfp fp, sp, #-0x200
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sub fp, sp, #0x200
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add sp, fp, #0x200
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bx lr
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.personality __gxx_personality_v0
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.handlerdata
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.fnend
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@-------------------------------------------------------------------------------
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@ The assembler should emit 0x9B to copy stack pointer from r11.
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@ The assembler should emit 0x3F and ((-offset - 0x104) >> 2) for offset.
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@-------------------------------------------------------------------------------
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@ CHECK: Section {
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@ CHECK: Name: .ARM.extab.TEST3
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@ CHECK: SectionData (
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@ CHECK: 0000: 00000000 3F009B00 00000000 3F3F9B00 |....?.......??..|
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@ CHECK: )
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@ CHECK: }
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@-------------------------------------------------------------------------------
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@ TEST4
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@-------------------------------------------------------------------------------
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.section .TEST4
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.globl func4a
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.align 2
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.type func4a,%function
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.fnstart
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func4a:
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.setfp fp, sp, #-0x204
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sub fp, sp, #0x204
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add sp, fp, #0x204
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bx lr
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.personality __gxx_personality_v0
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.handlerdata
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.fnend
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.globl func4b
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.align 2
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.type func4b,%function
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.fnstart
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func4b:
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.setfp fp, sp, #-0x580
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sub fp, sp, #0x580
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add sp, fp, #0x580
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bx lr
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.personality __gxx_personality_v0
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.handlerdata
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.fnend
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@-------------------------------------------------------------------------------
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@ The assembler should emit 0x9B to copy stack pointer from r11.
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@ The assembler should emit 0xB2 and the ULEB128 encoding of
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@ ((-offset - 0x204) >> 2) for offset.
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@-------------------------------------------------------------------------------
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@ CHECK: Section {
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@ CHECK: Name: .ARM.extab.TEST4
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@ CHECK: SectionData (
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@ CHECK: 0000: 00000000 00B29B00 00000000 DFB29B01 |................|
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@ CHECK: 0010: B0B0B001 |....|
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@ CHECK: )
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@ CHECK: }
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@-------------------------------------------------------------------------------
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@ TEST5
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@-------------------------------------------------------------------------------
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.section .TEST5
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.globl func5a
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.align 2
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.type func5a,%function
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.fnstart
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func5a:
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.setfp fp, sp, #0x4
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add fp, sp, #0x4
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sub sp, fp, #0x4
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bx lr
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.personality __gxx_personality_v0
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.handlerdata
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.fnend
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.globl func5b
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.align 2
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.type func5b,%function
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.fnstart
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func5b:
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.setfp fp, sp, #0x104
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add fp, sp, #0x104
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sub sp, fp, #0x104
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bx lr
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.personality __gxx_personality_v0
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.handlerdata
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.fnend
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.globl func5c
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.align 2
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.type func5c,%function
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.fnstart
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func5c:
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.setfp fp, sp, #0x204
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add fp, sp, #0x204
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sub sp, fp, #0x204
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bx lr
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.personality __gxx_personality_v0
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.handlerdata
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.fnend
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@-------------------------------------------------------------------------------
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@ The assembler should emit 0x9B to copy stack pointer from r11.
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@ The assembler should emit (0x40 | (offset - 4)) >> 2 for offset.
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@ If (offset - 4) is greater than 0x3f, then multiple 0x7f should be emitted.
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@-------------------------------------------------------------------------------
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@ CHECK: Section {
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@ CHECK: Name: .ARM.extab.TEST5
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@ CHECK: SectionData (
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@ CHECK: 0000: 00000000 B0409B00 00000000 7F409B00 |.....@.......@..|
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@ CHECK: 0010: 00000000 7F409B01 B0B0B07F |.....@......|
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@ CHECK: )
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@ CHECK: }
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