[all-commits] [llvm/llvm-project] b3ff2b: [PAC][CodeGen][ELF][AArch64] Support signed TLSDESC

[Daniil Kovalev via All-commits]

  Branch: refs/heads/users/kovdan01/pauth-signed-tlsdesc-codegen
  Home:   https://github.com/llvm/llvm-project
  Commit: b3ff2bb40a3cfb8db35962acf2dccaca538b4ceb
      https://github.com/llvm/llvm-project/commit/b3ff2bb40a3cfb8db35962acf2dccaca538b4ceb
  Author: Daniil Kovalev <dkovalev at accesssoftek.com>
  Date:   2024-10-27 (Sun, 27 Oct 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.h
    M llvm/lib/Target/AArch64/AArch64InstrInfo.td
    M llvm/lib/Target/AArch64/AArch64MCInstLower.cpp
    M llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
    M llvm/lib/Target/AArch64/MCTargetDesc/AArch64ELFObjectWriter.cpp
    M llvm/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.cpp
    M llvm/lib/Target/AArch64/MCTargetDesc/AArch64MCExpr.h
    A llvm/test/CodeGen/AArch64/ptrauth-arm64-tls-dynamics.ll
    M llvm/test/MC/AArch64/arm64-elf-relocs.s
    M llvm/test/MC/AArch64/ilp32-diagnostics.s

  Log Message:
  -----------
  [PAC][CodeGen][ELF][AArch64] Support signed TLSDESC

Support the following relocations and assembly operators:

- `R_AARCH64_AUTH_TLSDESC_ADR_PAGE21` (`:tlsdesc_auth:` for `adrp`)
- `R_AARCH64_AUTH_TLSDESC_LD64_LO12` (`:tlsdesc_auth_lo12:` for `ldr`)
- `R_AARCH64_AUTH_TLSDESC_ADD_LO12` (`:tlsdesc_auth_lo12:` for `add`)

`TLSDESC_AUTH_CALLSEQ` pseudo-instruction is introduced which is later expanded
to actual instruction sequence like the following.

```
adrp  x0, :tlsdesc_auth:var
ldr   x16, [x0, #:tlsdesc_auth_lo12:var]
add   x0, x0, #:tlsdesc_auth_lo12:var
.tlsdesccall var
blraa x16, x0
(TPIDR_EL0 offset now in x0)
```

Only SelectionDAG ISel is supported.

Tests starting with 'ptrauth-' have corresponding variants w/o this prefix.



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