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llvm-project/lld/test/ELF/ppc64-toc-call-to-pcrel.s

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[PowerPC] Support PCRelative Callees for R_PPC64_REL24 Relocation The R_PPC64_REL24 is used in function calls when the caller requires a valid TOC pointer. If the callee shares the same TOC or does not clobber the TOC pointer then a direct call can be made. If the callee does not share the TOC a thunk must be added to save the TOC pointer for the caller. Up until PC Relative was introduced all local calls on medium and large code models were assumed to share a TOC. This is no longer the case because if the caller requires a TOC and the callee is PC Relative then the callee can clobber the TOC even if it is in the same DSO. This patch is to add support for a TOC caller calling a PC Relative callee that clobbers the TOC. Reviewed By: sfertile, MaskRay Differential Revision: https://reviews.llvm.org/D82950
2020-07-09 22:50:19 +08:00
# REQUIRES: ppc
# RUN: echo 'SECTIONS { \
# RUN: .text_callee 0x10010000 : { *(.text_callee) } \
# RUN: .text_caller 0x10020000 : { *(.text_caller) } \
# RUN: }' > %t.script
# RUN: llvm-mc -filetype=obj -triple=powerpc64le %s -o %t.o
# RUN: ld.lld -T %t.script %t.o -o %t
# RUN: llvm-readelf -s %t | FileCheck %s --check-prefix=SYMBOL
# RUN: llvm-objdump -d --no-show-raw-insn --mcpu=future %t | FileCheck %s
# RUN: llvm-mc -filetype=obj -triple=powerpc64 %s -o %t.o
# RUN: ld.lld -T %t.script %t.o -o %t
# RUN: llvm-readelf -s %t | FileCheck %s --check-prefix=SYMBOL
# RUN: llvm-objdump -d --no-show-raw-insn --mcpu=future %t | FileCheck %s
[PowerPC][PC Rel] Implement option to omit Power10 instructions from stubs Implemented the option to omit Power10 instructions from save stubs via the option --no-power10-stubs or --power10-stubs=no on lld. --power10-stubs= will override the other option. --power10-stubs=auto also exists to use the default behaviour (ie allow Power10 instructions in stubs). Differential Revision: https://reviews.llvm.org/D94627
2021-03-05 02:17:40 +08:00
# RUN: llvm-mc -filetype=obj -triple=powerpc64 %s -o %t.o
# RUN: ld.lld -T %t.script %t.o -o %t --no-power10-stubs
# RUN: llvm-readelf -s %t | FileCheck %s --check-prefix=SYMBOL
# RUN: llvm-objdump -d --no-show-raw-insn --mcpu=future %t \
# RUN: | FileCheck %s
[PowerPC] Support PCRelative Callees for R_PPC64_REL24 Relocation The R_PPC64_REL24 is used in function calls when the caller requires a valid TOC pointer. If the callee shares the same TOC or does not clobber the TOC pointer then a direct call can be made. If the callee does not share the TOC a thunk must be added to save the TOC pointer for the caller. Up until PC Relative was introduced all local calls on medium and large code models were assumed to share a TOC. This is no longer the case because if the caller requires a TOC and the callee is PC Relative then the callee can clobber the TOC even if it is in the same DSO. This patch is to add support for a TOC caller calling a PC Relative callee that clobbers the TOC. Reviewed By: sfertile, MaskRay Differential Revision: https://reviews.llvm.org/D82950
2020-07-09 22:50:19 +08:00
# The point of this test is to make sure that when a function with TOC access
# a local function with st_other=1, a TOC save stub is inserted.
# SYMBOL: Symbol table '.symtab' contains 7 entries
# SYMBOL: 10010000 0 NOTYPE LOCAL DEFAULT [<other: 0x20>] 1 callee
# SYMBOL: 10020000 0 NOTYPE LOCAL DEFAULT [<other: 0x60>] 2 caller
# SYMBOL: 10020020 0 NOTYPE LOCAL DEFAULT [<other: 0x60>] 2 caller_14
[PowerPC] Fix thunk alignment issue when using pc-rel instruction Thunk alignment is added in thie patch when using pc-rel instructions to avoid crossing the 64 byte boundary. Patched by: nemanjai, NeHuang Reviewed By: sfertile, MaskRay Differential Revision: https://reviews.llvm.org/D85973
2020-08-17 21:38:05 +08:00
# SYMBOL: 10020040 8 FUNC LOCAL DEFAULT 2 __toc_save_callee
[PowerPC] Support PCRelative Callees for R_PPC64_REL24 Relocation The R_PPC64_REL24 is used in function calls when the caller requires a valid TOC pointer. If the callee shares the same TOC or does not clobber the TOC pointer then a direct call can be made. If the callee does not share the TOC a thunk must be added to save the TOC pointer for the caller. Up until PC Relative was introduced all local calls on medium and large code models were assumed to share a TOC. This is no longer the case because if the caller requires a TOC and the callee is PC Relative then the callee can clobber the TOC even if it is in the same DSO. This patch is to add support for a TOC caller calling a PC Relative callee that clobbers the TOC. Reviewed By: sfertile, MaskRay Differential Revision: https://reviews.llvm.org/D82950
2020-07-09 22:50:19 +08:00
# CHECK-LABEL: callee
# CHECK: blr
# CHECK-LABEL: caller
[PowerPC] Fix thunk alignment issue when using pc-rel instruction Thunk alignment is added in thie patch when using pc-rel instructions to avoid crossing the 64 byte boundary. Patched by: nemanjai, NeHuang Reviewed By: sfertile, MaskRay Differential Revision: https://reviews.llvm.org/D85973
2020-08-17 21:38:05 +08:00
# CHECK: bl 0x10020040
[PowerPC] Support PCRelative Callees for R_PPC64_REL24 Relocation The R_PPC64_REL24 is used in function calls when the caller requires a valid TOC pointer. If the callee shares the same TOC or does not clobber the TOC pointer then a direct call can be made. If the callee does not share the TOC a thunk must be added to save the TOC pointer for the caller. Up until PC Relative was introduced all local calls on medium and large code models were assumed to share a TOC. This is no longer the case because if the caller requires a TOC and the callee is PC Relative then the callee can clobber the TOC even if it is in the same DSO. This patch is to add support for a TOC caller calling a PC Relative callee that clobbers the TOC. Reviewed By: sfertile, MaskRay Differential Revision: https://reviews.llvm.org/D82950
2020-07-09 22:50:19 +08:00
# CHECK-NEXT: ld 2, 24(1)
# CHECK-NEXT: blr
# CHECK-LABEL: caller_14
[PowerPC] Fix thunk alignment issue when using pc-rel instruction Thunk alignment is added in thie patch when using pc-rel instructions to avoid crossing the 64 byte boundary. Patched by: nemanjai, NeHuang Reviewed By: sfertile, MaskRay Differential Revision: https://reviews.llvm.org/D85973
2020-08-17 21:38:05 +08:00
# CHECK: bfl 0, 0x10020040
[PowerPC] Support PCRelative Callees for R_PPC64_REL24 Relocation The R_PPC64_REL24 is used in function calls when the caller requires a valid TOC pointer. If the callee shares the same TOC or does not clobber the TOC pointer then a direct call can be made. If the callee does not share the TOC a thunk must be added to save the TOC pointer for the caller. Up until PC Relative was introduced all local calls on medium and large code models were assumed to share a TOC. This is no longer the case because if the caller requires a TOC and the callee is PC Relative then the callee can clobber the TOC even if it is in the same DSO. This patch is to add support for a TOC caller calling a PC Relative callee that clobbers the TOC. Reviewed By: sfertile, MaskRay Differential Revision: https://reviews.llvm.org/D82950
2020-07-09 22:50:19 +08:00
# CHECK-NEXT: ld 2, 24(1)
# CHECK-NEXT: blr
# CHECK-LABEL: __toc_save_callee
# CHECK-NEXT: std 2, 24(1)
# CHECK-NEXT: b 0x10010000
.section .text_callee, "ax", %progbits
callee:
.localentry callee, 1
blr
.section .text_caller, "ax", %progbits
caller:
.Lfunc_gep1:
addis 2, 12, .TOC.-.Lfunc_gep1@ha
addi 2, 2, .TOC.-.Lfunc_gep1@l
.Lfunc_lep1:
.localentry caller, .Lfunc_lep1-.Lfunc_gep1
addis 30, 2, global@toc@ha
lwz 3, global@toc@l(30)
bl callee
nop
blr
global:
.long 0
caller_14:
.Lfunc_gep2:
addis 2, 12, .TOC.-.Lfunc_gep1@ha
addi 2, 2, .TOC.-.Lfunc_gep1@l
.Lfunc_lep2:
.localentry caller_14, .Lfunc_lep2-.Lfunc_gep2
addis 30, 2, global@toc@ha
lwz 3, global@toc@l(30)
bcl 4, 0, callee
nop
blr