derek.holloway
7502bf64a4
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84 lines
2.0 KiB
ArmAsm
84 lines
2.0 KiB
ArmAsm
.globl _start
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.type _start,@function
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.text
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_start:
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.cfi_startproc
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0:
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addis 2,12,(.TOC.-0b)@ha
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addi 2,2,(.TOC.-0b)@l
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.localentry _start,.-0b
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mflr 0
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std 0,16(1)
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stdu 1,-32(1)
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.cfi_def_cfa_offset 32
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.cfi_offset 65, 16
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.macro call f
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bl \f
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nop
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.endm
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# 3000 plt calls, giving over 64k in .plt size. With a small .got
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# this guarantees some plt call stubs can use a 16-bit signed offset
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# from .TOC. while others need a 32-bit signed offset (and are larger).
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.irpc t4,012
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.irpc t3,0123456789
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.irpc t2,0123456789
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.irpc t1,0123456789
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.if \t4
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call f\t4\t3\t2\t1
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.elseif \t3
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call f\t3\t2\t1
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.elseif \t2
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call f\t2\t1
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.else
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call f\t1
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.endif
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.endr
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.endr
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.endr
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.endr
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addi 1,1,32
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.cfi_def_cfa_offset 0
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ld 0,16(1)
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mtlr 0
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.cfi_restore 65
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blr
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.cfi_endproc
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.size _start,.-_start
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# Padding to trigger a stub sizing error with commit 2f83249c13 and
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# c804c6f98d (relro changes). This particular testcase gives a decrease
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# in .got to .plt gap after .eh_frame editing, resulting in some plt
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# call stubs being smaller. If the very last one is smaller the size
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# error triggers. Arguably, the ppc64 backend should not report an
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# error for shrinkage. However, the actual PR object files showed an
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# *increase* in .got to .plt gap after .eh_frame editing, resulting in
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# some plt call stubs being larger. That hit an assertion failure
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# when a long branch stub followed the larger plt call stub and
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# overwrote the end of the plt call stub.
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# With enough fiddling of this testcase it likely would be possible to
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# find the right padding here and .eh_frame sizing to trigger an
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# increase in .got to .plt gap. The point of this testcase is to show
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# that the .got to .plt gap should not change after sizing.
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.space 50000
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# Generate some .eh_frame info that -gc-sections will trim
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.macro fundef f
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.section .text.\f,"ax",@progbits
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.type \f,@function
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\f:
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.cfi_startproc
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blr
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.cfi_endproc
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.size \f,.-\f
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.endm
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.irpc t2,0123456789
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.irpc t1,0123456789
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fundef dummy\t2\t1
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.endr
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.endr
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