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llvm-project/llvm/test/MC/ELF/cfi-restore-extended.s

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Fix .cfi_restore with register numbers > 64 Summary: DW_CFA_restore can only encode register numbers up to 64 (6 bits unsigned int). For regsiter numbers > 64 we have to use DW_CFA_restore_extended instead which uses a ULEB128 value. I discovered this problem in the out-of-tree CHERI target since we use DWARF register number 89 for our return capability register. Reviewers: probinson, dblaikie, aprantl, espindola Reviewed By: dblaikie Subscribers: JohnReagan, emaste, JDevlieghere, llvm-commits Differential Revision: https://reviews.llvm.org/D54420 llvm-svn: 346751
2018-11-13 18:54:49 +08:00
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | llvm-dwarfdump -debug-frame - | FileCheck %s
// Check that register numbers greater than 63 can be used in .cfi_restore directives
f:
.cfi_startproc
nop
// CHECK: DW_CFA_advance_loc: 1
.cfi_restore %rbp
Show register names in DWARF unwind info. Register context information was already being passed into the DWARFDebugFrame code that dumps unwind information but it wasn't being used. This change adds the ability to dump registers names of a valid MC register context was passed in and if it knows about the register. Updated the tests to use the newly returned register names. Differential Revision: https://reviews.llvm.org/D88767
2020-10-03 09:05:10 +08:00
// CHECK-NEXT: DW_CFA_restore: RBP
Fix .cfi_restore with register numbers > 64 Summary: DW_CFA_restore can only encode register numbers up to 64 (6 bits unsigned int). For regsiter numbers > 64 we have to use DW_CFA_restore_extended instead which uses a ULEB128 value. I discovered this problem in the out-of-tree CHERI target since we use DWARF register number 89 for our return capability register. Reviewers: probinson, dblaikie, aprantl, espindola Reviewed By: dblaikie Subscribers: JohnReagan, emaste, JDevlieghere, llvm-commits Differential Revision: https://reviews.llvm.org/D54420 llvm-svn: 346751
2018-11-13 18:54:49 +08:00
nop
// CHECK-NEXT: DW_CFA_advance_loc: 1
.cfi_restore 89
// CHECK-NEXT: DW_CFA_restore_extended: reg89
// CHECK-NEXT: DW_CFA_nop:
nop
.cfi_endproc