4b5ec7fb80
Recommitting https://reviews.llvm.org/rL344544 after fixing undefined behavior from left-shifting a negative value. Original commit message: This support is slightly different then the X86_64 implementation in that calls to __morestack don't need to get rewritten to calls to __moresatck_non_split when a split-stack caller calls a non-split-stack callee. Instead the size of the stack frame requested by the caller is adjusted prior to the call to __morestack. The size the stack-frame will be adjusted by is tune-able through a new --split-stack-adjust-size option. llvm-svn: 344622
65 lines
2.1 KiB
ArmAsm
65 lines
2.1 KiB
ArmAsm
# REQUIRES: ppc
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# RUN: llvm-mc -filetype=obj -triple=powerpc64le-unknown-linux %s -o %t1.o
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# RUN: llvm-mc -filetype=obj -triple=powerpc64le-unknown-linux %p/Inputs/ppc64-no-split-stack.s -o %t2.o
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# RUN: not ld.lld %t1.o %t2.o -o %t --defsym __morestack=0x10010000 2>&1 | \
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# RUN: FileCheck -check-prefix=OVERFLOW %s
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# RUN: not ld.lld %t1.o %t2.o -o %t --defsym __morestack=0x10010000 \
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# RUN: -split-stack-adjust-size 4097 2>&1 | FileCheck -check-prefix=OVERFLOW %s
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# RUN: ld.lld %t1.o %t2.o -o %t --defsym __morestack=0x10010000 -split-stack-adjust-size 4096
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# RUN: llvm-objdump -d %t | FileCheck %s
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# RUN: llvm-mc -filetype=obj -triple=powerpc64-unknown-linux %s -o %t1.o
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# RUN: llvm-mc -filetype=obj -triple=powerpc64-unknown-linux %p/Inputs/ppc64-no-split-stack.s -o %t2.o
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# RUN: not ld.lld %t1.o %t2.o -o %t --defsym __morestack=0x10010000 2>&1 | \
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# RUN: FileCheck -check-prefix=OVERFLOW %s
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# RUN: not ld.lld %t1.o %t2.o -o %t --defsym __morestack=0x10010000 \
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# RUN: -split-stack-adjust-size 4097 2>&1 | FileCheck -check-prefix=OVERFLOW %s
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# RUN: ld.lld %t1.o %t2.o -o %t --defsym __morestack=0x10010000 -split-stack-adjust-size 4096
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# RUN: llvm-objdump -d %t | FileCheck %s
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# OVERFLOW: error: {{.*}}.o:(function caller): split-stack prologue adjustment overflows
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.p2align 2
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.global caller
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.type caller, @function
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caller:
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.Lcaller_gep:
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addis 2, 12, .TOC.-.Lcaller_gep@ha
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addi 2, 2, .TOC.-.Lcaller_gep@l
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.localentry caller, .-caller
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ld 0, -0x7040(13)
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addis 12, 1, -32768
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addi 12, 12, 4096
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cmpld 7, 12, 0
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blt- 7, .Lcaller_alloc_more
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.Lcaller_body:
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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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bl nss_callee
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addi 1, 1, 32
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ld 0, 16(1)
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mtlr 0
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blr
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.Lcaller_alloc_more:
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mflr 0
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std 0, 16(1)
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bl __morestack
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ld 0, 16(1)
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mtlr 0
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blr
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b .Lcaller_body
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.size caller, .-caller
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# CHECK-LABEL: caller
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# CHECK: ld 0, -28736(13)
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# CHECK-NEXT: addis 12, 1, -32768
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# CHECK-NEXT: nop
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# CHECK-NEXT: cmpld 7, 12, 0
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# CHECK-NEXT: bt- 28, .+36
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.section .note.GNU-split-stack,"",@progbits
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