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Vendor import of LLVM libunwind release_80 branch r364487:

Browse Source 
https://llvm.org/svn/llvm-project/libunwind/branches/release_80@364487
This commit is contained in:
Dimitry Andric 2019-07-06 15:34:04 +00:00
parent 2bcfbb511a
commit 28cb8d7d18
2 changed files with 42 additions and 1 deletions
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25
src/DwarfInstructions.hpp
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@ -234,6 +234,31 @@ int DwarfInstructions<A, R>::stepWithDwarf(A &addressSpace, pint_t pc,
}
#endif
#if defined(_LIBUNWIND_TARGET_PPC64)
#define PPC64_ELFV1_R2_LOAD_INST_ENCODING 0xe8410028u // ld r2,40(r1)
#define PPC64_ELFV1_R2_OFFSET 40
#define PPC64_ELFV2_R2_LOAD_INST_ENCODING 0xe8410018u // ld r2,24(r1)
#define PPC64_ELFV2_R2_OFFSET 24
// If the instruction at return address is a TOC (r2) restore,
// then r2 was saved and needs to be restored.
// ELFv2 ABI specifies that the TOC Pointer must be saved at SP + 24,
// while in ELFv1 ABI it is saved at SP + 40.
if (R::getArch() == REGISTERS_PPC64 && returnAddress != 0) {
pint_t sp = newRegisters.getRegister(UNW_REG_SP);
pint_t r2 = 0;
switch (addressSpace.get32(returnAddress)) {
case PPC64_ELFV1_R2_LOAD_INST_ENCODING:
r2 = addressSpace.get64(sp + PPC64_ELFV1_R2_OFFSET);
break;
case PPC64_ELFV2_R2_LOAD_INST_ENCODING:
r2 = addressSpace.get64(sp + PPC64_ELFV2_R2_OFFSET);
break;
}
if (r2)
newRegisters.setRegister(UNW_PPC64_R2, r2);
}
#endif
// Return address is address after call site instruction, so setting IP to
// that does simualates a return.
newRegisters.setIP(returnAddress);

18
src/assembly.h
View File

@ -35,6 +35,20 @@
#define SEPARATOR ;
#endif
#if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1)
#define PPC64_OPD1 .section .opd,"aw",@progbits SEPARATOR
#define PPC64_OPD2 SEPARATOR \
.p2align 3 SEPARATOR \
.quad .Lfunc_begin0 SEPARATOR \
.quad .TOC.@tocbase SEPARATOR \
.quad 0 SEPARATOR \
.text SEPARATOR \
.Lfunc_begin0:
#else
#define PPC64_OPD1
#define PPC64_OPD2
#endif
#define GLUE2(a, b) a ## b
#define GLUE(a, b) GLUE2(a, b)
#define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
@ -95,7 +109,9 @@
.globl SYMBOL_NAME(name) SEPARATOR \
EXPORT_SYMBOL(name) SEPARATOR \
SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \
SYMBOL_NAME(name):
PPC64_OPD1 \
SYMBOL_NAME(name): \
PPC64_OPD2
#define DEFINE_LIBUNWIND_PRIVATE_FUNCTION(name) \
.globl SYMBOL_NAME(name) SEPARATOR \