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proc: support reading deferred calls' arguments on linux/arm64 (#2210)

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This commit is contained in:
Alessandro Arzilli
2020-10-22 17:26:19 +02:00
committed by GitHub
parent 1a782d321d
commit 775c923ec4
5 changed files with 20 additions and 10 deletions
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24
pkg/proc/stack.go
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@ -660,13 +660,23 @@ func (d *Defer) EvalScope(thread Thread) (*EvalScope, error) {
}
// The arguments are stored immediately after the defer header struct, i.e.
// addr+sizeof(_defer). Since CFA in go is always the address of the first
// argument, that's what we use for the value of CFA.
// For SP we use CFA minus the size of one pointer because that would be
// the space occupied by pushing the return address on the stack during the
// CALL.
scope.Regs.CFA = (int64(d.variable.Addr) + d.variable.RealType.Common().ByteSize)
scope.Regs.Reg(scope.Regs.SPRegNum).Uint64Val = uint64(scope.Regs.CFA - int64(bi.Arch.PtrSize()))
// addr+sizeof(_defer).
if !bi.Arch.usesLR {
// On architectures that don't have a link register CFA is always the address of the first
// argument, that's what we use for the value of CFA.
// For SP we use CFA minus the size of one pointer because that would be
// the space occupied by pushing the return address on the stack during the
// CALL.
scope.Regs.CFA = (int64(d.variable.Addr) + d.variable.RealType.Common().ByteSize)
scope.Regs.Reg(scope.Regs.SPRegNum).Uint64Val = uint64(scope.Regs.CFA - int64(bi.Arch.PtrSize()))
} else {
// On architectures that have a link register CFA and SP have the same
// value but the address of the first argument is at CFA+ptrSize so we set
// CFA to the start of the argument frame minus one pointer size.
scope.Regs.CFA = int64(d.variable.Addr) + d.variable.RealType.Common().ByteSize - int64(bi.Arch.PtrSize())
scope.Regs.Reg(scope.Regs.SPRegNum).Uint64Val = uint64(scope.Regs.CFA)
}
rdr := scope.Fn.cu.image.dwarfReader
rdr.Seek(scope.Fn.offset)