* configure.ac (gcry_cv_gcc_asm_cfi_directives): New.
* cipher/asm-common-amd64.h (ADD_RIP, CFI_STARTPROC, CFI_ENDPROC)
(CFI_REMEMBER_STATE, CFI_RESTORE_STATE, CFI_ADJUST_CFA_OFFSET)
(CFI_REL_OFFSET, CFI_DEF_CFA_REGISTER, CFI_REGISTER, CFI_RESTORE)
(CFI_PUSH, CFI_POP, CFI_POP_TMP_REG, CFI_LEAVE, DW_REGNO)
(DW_SLEB128_7BIT, DW_SLEB128_28BIT, CFI_CFA_ON_STACK)
(CFI_REG_ON_STACK): New.
(ENTER_SYSV_FUNCPARAMS_0_4, EXIT_SYSV_FUNC): Add CFI directives.
* cipher/arcfour-amd64.S: Add CFI directives.
* cipher/blake2b-amd64-avx2.S: Add CFI directives.
* cipher/blake2s-amd64-avx.S: Add CFI directives.
* cipher/blowfish-amd64.S: Add CFI directives.
* cipher/camellia-aesni-avx-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/camellia-aesni-avx2-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/cast5-amd64.S: Add CFI directives.
* cipher/chacha20-amd64-avx2.S: Add CFI directives.
* cipher/chacha20-amd64-ssse3.S: Add CFI directives.
* cipher/des-amd64.S: Add CFI directives.
* cipher/rijndael-amd64.S: Add CFI directives.
* cipher/rijndael-ssse3-amd64-asm.S: Add CFI directives.
* cipher/salsa20-amd64.S: Add CFI directives; Use 'asm-common-amd64.h'.
* cipher/serpent-avx2-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/serpent-sse2-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/sha1-avx-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/sha1-avx-bmi2-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/sha1-avx2-bmi2-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/sha1-ssse3-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/sha256-avx-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/sha256-avx2-bmi2-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/sha256-ssse3-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/sha512-avx-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/sha512-avx2-bmi2-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/sha512-ssse3-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/twofish-amd64.S: Add CFI directives.
* cipher/twofish-avx2-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* cipher/whirlpool-sse2-amd64.S: Add CFI directives; Use
'asm-common-amd64.h'.
* mpi/amd64/func_abi.h: Include 'config.h'.
(CFI_STARTPROC, CFI_ENDPROC, CFI_ADJUST_CFA_OFFSET, CFI_REL_OFFSET)
(CFI_RESTORE, CFI_PUSH, CFI_POP): New.
(FUNC_ENTRY, FUNC_EXIT): Add CFI directives.