Misc about gold for aarch64 backend.

The patch does the following things:
  -- Add support for ifunc.
  -- Enable safe icf
  -- Add support for TLSLD relocations
     R_AARCH64_TLSLD_ADR_PAGE21,
     R_AARCH64_TLSLD_ADD_LO12_NC,
     R_AARCH64_TLSLD_MOVW_DTPREL_G1,
     R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC.
     (R_AARCH64_TLSLD_MOVW_* are used by LLVM.)
  -- Add support for TLSLD->TLSLE relaxation.
  -- Add support for R_AARCH64_LD_PREL_LO19, R_AARCH64_ADR_PREL_LO21.
  -- Fix 2 encoding bugs in AArch64_relocate_functions::update_movnz.
  -- Correct TLS relocation properties in gold/aarch64-reloc.def.
  -- Update testsuite/icf_safe_so_test.cc, testsuite/icf_safe_test.sh.

gold/
2014-10-29  Han Shen  <shenhan@google.com>
            Jing Yu   <jingyu@google.com>

	* aarch64-reloc.def: Add LD_PREL_LO12, ADR_PREL_LO21,
	TLSLD_ADR_PAGE21, TLSLD_ADD_LO12_NC, TLSLD_MOVW_DTPREL_G1,
	TLSLD_MOVW_DTPREL_G0_NC. Change property of TLS relocations to
	Symbol::TLS_REF.
	* aarch64.cc (Target_aarch64::do_can_check_for_function_pointers): New
	method.
	(Target_aarch64::reloc_needs_plt_for_ifunc): New method.
	(Target_aarch64::tls_ld_to_le): New method.
	(Target_aarch64::aarch64_info): Enable can_icf_inline_merge_sections
	for 64bit targets.
	(Output_data_plt_aarch64::irelative_rel_): New data member.
	(Output_data_plt_aarch64::add_entry): Add irelative entries to plt.
	(Output_data_plt_aarch64::add_local_ifunc_entry): New method.
	(Output_data_plt_aarch64::add_relocation): New method.
	(Output_data_plt_aarch64::do_write): Add gold_assert on got_irelative
	offset. Add got_irelative size to got size.
	(AArch64_relocate_functions): Typedef AArch64_valtype. Replace long
	type string with the new typename.
	(AArch64_relocate_functions::update_adr): Replace parameter x with
	immed.
	(AArch64_relocate_functions::update_movnz): Correct wrong val mask.
	(AArch64_relocate_functions::reloc_common): New method.
	(AArch64_relocate_funcsions::rela_general): Extract common part out
	into reloc_common method.
	(AArch64_relocate_functions::rela_general): Likewise.
	(AArch64_relocate_functions::pcrela_general): Likewise.
	(AArch64_relocate_functions::adr): New method.
	(AArch64_relocate_functions::adrp): Calculate immed before calling
	update_adr.
	(AArch64_relocate_functions::adrp): Likewise.
	(AArch64_relocate_functions::movnz): Cast x to SignedW type when
	comparing x to 0. Calculate immed from ~x when x < 0.
	(Target_aarch64::optimize_tls_reloc): Add new cases for
	TLSLD_ADR_PAGE21, TLSLD_ADD_LO12_NC, TLSLD_MOVW_DTPREL_G1,
	TLSLD_MOVW_DTPREL_G0_NC.
	(Target_aarch64::possible_function_pointer_reloc): Implement this
	method.
	(Target_aarch64::Scan::local_reloc_may_be_function_pointer): Update
	comment.
	(Target_aarch64::Scan::local): Add codes to handle STT_GNU_IFUNC
	symbol. Add cases for TLSLD_ADR_PAGE21, TLSLD_ADD_LO12_NC,
	TLSLD_MOVW_DTPREL_G1, TLSLD_MOVW_DTPREL_G0_NC.
	(Target_aarch64::Scan::global): Add codes to handle STT_GNU_IFUNC
	symbol. Add cases for TLSLD_ADR_PAGE21, TLSLD_ADD_LO12_NC,
	TLSLD_MOVW_DTPREL_G1, TLSLD_MOVW_DTPREL_G0_NC.
	(Target_aarch64::make_plt_entry): Call add_entry with two more
	parameters.
	(Target_aarch64::make_local_ifunc_plt_entry): New method.
	(Target_aarch64::Relocate::relocate): Add cases for LD_PREL_LO19,
	ADR_PREL_LO21, TLSLD_ADR_PAGE21, TLSLD_ADD_LO12_NC,
	TLSLD_MOVW_DTPREL_G1, TLSLD_MOVW_DTPREL_G0_NC.
	(Target_aarch64::Relocate::relocate_tls): Add cases for
	TLSLD_ADR_PAGE21, TLSLD_ADD_LO12_NC, TLSLD_MOVW_DTPREL_G1,
	TLSLD_MOVW_DTPREL_G0_NC.
	* testsuite/icf_safe_so_test.cc: Correct test comment.
	* testsuite/icf_safe_test.sh: Add AArch64 arch.

1 files changed, 29 insertions, 15 deletions

diff --git a/gold/aarch64-reloc.def b/gold/aarch64-reloc.def
index 214dc22591e..70bf4de5a60 100644
--- a/gold/aarch64-reloc.def
+++ b/gold/aarch64-reloc.def
@@ -40,16 +40,22 @@ ARD(PREL32                       , STATIC ,  DATA       ,   Y,  -1,   31,32
 ARD(PREL16                       , STATIC ,  DATA       ,   Y,  -1,   15,16               ,    0,0  , Symbol::RELATIVE_REF ,                         DATA  )
 // Above is from Table 4-6, Data relocations, 257-262.
 
+ARD(LD_PREL_LO19		 , STATIC ,  AARCH64    ,   Y,  -1,   20,20		  ,    2,20 , Symbol::RELATIVE_REF , 			     LDST  )
+ARD(ADR_PREL_LO21		 , STATIC ,  AARCH64    ,   Y,  -1,   20,20		  ,    0,20 , Symbol::RELATIVE_REF , 			     ADR   )
 ARD(ADR_PREL_PG_HI21             , STATIC ,  AARCH64    ,   Y,  -1,   32,32               ,   12,32 , Symbol::RELATIVE_REF ,                         ADRP  )
 ARD(ADR_PREL_PG_HI21_NC          , STATIC ,  AARCH64    ,   Y,  -1,    0,0                ,   12,32 , Symbol::RELATIVE_REF ,                         ADRP  )
+ARD(ADD_ABS_LO12_NC              , STATIC ,  AARCH64    ,   Y,  -1,    0,0                ,    0,11 , Symbol::ABSOLUTE_REF ,                         ADD   )
 ARD(LDST8_ABS_LO12_NC            , STATIC ,  AARCH64    ,   Y,  -1,    0,0                ,    0,11 , Symbol::ABSOLUTE_REF ,                         LDST  )
 ARD(LDST16_ABS_LO12_NC           , STATIC ,  AARCH64    ,   Y,  -1,    0,RL_CHECK_ALIGN2  ,    1,11 , Symbol::ABSOLUTE_REF ,                         LDST  )
 ARD(LDST32_ABS_LO12_NC           , STATIC ,  AARCH64    ,   Y,  -1,    0,RL_CHECK_ALIGN4  ,    2,11 , Symbol::ABSOLUTE_REF ,                         LDST  )
 ARD(LDST64_ABS_LO12_NC           , STATIC ,  AARCH64    ,   Y,  -1,    0,RL_CHECK_ALIGN8  ,    3,11 , Symbol::ABSOLUTE_REF ,                         LDST  )
 ARD(LDST128_ABS_LO12_NC          , STATIC ,  AARCH64    ,   Y,  -1,    0,RL_CHECK_ALIGN16 ,    4,11 , Symbol::ABSOLUTE_REF ,                         LDST  )
-ARD(ADD_ABS_LO12_NC              , STATIC ,  AARCH64    ,   Y,  -1,    0,0                ,    0,11 , Symbol::ABSOLUTE_REF ,                         ADD   )
+// Above 10 relocs are from Table 4-9, Relocations to generate 19, 21 and 33 bit PC-relative addresses.
+
 ARD(ADR_GOT_PAGE                 , STATIC ,  AARCH64    ,   Y,  -1,   32,32               ,   12,32 , Symbol::RELATIVE_REF ,                         ADRP  )
 ARD(LD64_GOT_LO12_NC             , STATIC ,  AARCH64    ,   Y,  -1,    0,RL_CHECK_ALIGN8  ,    3,11 , Symbol::ABSOLUTE_REF ,                         LDST  )
+// Above 2 relocs are from Table 4-14, GOT-relative instruction relocations. (Some relocs in the table are not implemented yet.)
+
 ARD(TSTBR14                      , STATIC ,  CFLOW      ,   N,  -1,   15,15               ,    2,15 , (Symbol::FUNCTION_CALL|Symbol::ABSOLUTE_REF) , TBZNZ )
 ARD(CONDBR19                     , STATIC ,  CFLOW      ,   N,  -1,   20,20               ,    2,20 , (Symbol::FUNCTION_CALL|Symbol::ABSOLUTE_REF) , CONDB )
 ARD(CALL26                       , STATIC ,  CFLOW      ,   Y,  -1,   27,27               ,    2,27 , (Symbol::FUNCTION_CALL|Symbol::RELATIVE_REF) , CALL  )
@@ -57,24 +63,32 @@ ARD(JUMP26                       , STATIC ,  CFLOW      ,   Y,  -1,   27,27
 // Above is from Table 4-10, Relocations for control-flow instructions,
 // 279-283.
 
-ARD(TLSGD_ADR_PAGE21             , STATIC ,  AARCH64    ,   Y,  -1,   32,32               ,   12,32 , Symbol::ABSOLUTE_REF ,                         ADRP  )
-ARD(TLSGD_ADD_LO12_NC            , STATIC ,  AARCH64    ,   Y,  -1,    0,0                ,    0,11 , Symbol::ABSOLUTE_REF ,                         ADD   )
-ARD(TLSIE_MOVW_GOTTPREL_G1       , STATIC ,  AARCH64    ,   N,  -1,    0,0                ,   16,31 , Symbol::ABSOLUTE_REF ,                         MOVW  )
-ARD(TLSIE_MOVW_GOTTPREL_G0_NC    , STATIC ,  AARCH64    ,   N,  -1,    0,0                ,    0,15 , Symbol::ABSOLUTE_REF ,                         MOVW  )
-ARD(TLSIE_ADR_GOTTPREL_PAGE21    , STATIC ,  AARCH64    ,   Y,  -1,   32,32               ,   12,32 , Symbol::ABSOLUTE_REF ,                         ADRP  )
-ARD(TLSIE_LD64_GOTTPREL_LO12_NC  , STATIC ,  AARCH64    ,   Y,  -1,    0,RL_CHECK_ALIGN8  ,    3,11 , Symbol::ABSOLUTE_REF ,                         LDST  )
-ARD(TLSIE_LD_GOTTPREL_PREL19     , STATIC ,  AARCH64    ,   N,  -1,   20,20               ,    2,20 , Symbol::ABSOLUTE_REF ,                         LD    )
+ARD(TLSGD_ADR_PAGE21             , STATIC ,  AARCH64    ,   Y,  -1,   32,32               ,   12,32 , Symbol::TLS_REF ,                              ADRP  )
+ARD(TLSGD_ADD_LO12_NC            , STATIC ,  AARCH64    ,   Y,  -1,    0,0                ,    0,11 , Symbol::TLS_REF ,                              ADD   )
+// Above is from Table 4-15, General Dynamic TLS relocations, 512-516.
+
+ARD(TLSLD_ADR_PAGE21             , STATIC ,  AARCH64    ,   Y,  -1,   32,32               ,   12,32 , Symbol::TLS_REF ,                              ADRP  )
+ARD(TLSLD_ADD_LO12_NC            , STATIC ,  AARCH64    ,   Y,  -1,    0,0                ,    0,11 , Symbol::TLS_REF ,                              ADD   )
+ARD(TLSLD_MOVW_DTPREL_G1         , STATIC ,  AARCH64    ,   Y,   1,   32,32               ,   16,31 , Symbol::TLS_REF ,                              ADRP  )
+ARD(TLSLD_MOVW_DTPREL_G0_NC      , STATIC ,  AARCH64    ,   Y,   0,    0,0                ,    0,15 , Symbol::TLS_REF ,                              MOVW  )
+// Above is from Table 4-16, Local Dynamic TLS relocations, 517-573.
+
+ARD(TLSIE_MOVW_GOTTPREL_G1       , STATIC ,  AARCH64    ,   N,  -1,   32,32               ,   16,31 , Symbol::TLS_REF ,                              MOVW  )
+ARD(TLSIE_MOVW_GOTTPREL_G0_NC    , STATIC ,  AARCH64    ,   N,  -1,    0,0                ,    0,15 , Symbol::TLS_REF ,                              MOVW  )
+ARD(TLSIE_ADR_GOTTPREL_PAGE21    , STATIC ,  AARCH64    ,   Y,  -1,   32,32               ,   12,32 , Symbol::TLS_REF ,                              ADRP  )
+ARD(TLSIE_LD64_GOTTPREL_LO12_NC  , STATIC ,  AARCH64    ,   Y,  -1,    0,RL_CHECK_ALIGN8  ,    3,11 , Symbol::TLS_REF ,                              LDST  )
+ARD(TLSIE_LD_GOTTPREL_PREL19     , STATIC ,  AARCH64    ,   N,  -1,   20,20               ,    2,20 , Symbol::TLS_REF ,                              LD    )
 // Above is from Table 4-17, Initial Exec TLS relocations, 539-543.
 
-ARD(TLSLE_ADD_TPREL_HI12         , STATIC ,  AARCH64   ,    Y,  -1,    0,24               ,   12,23 , Symbol::ABSOLUTE_REF ,                         ADD   )
-ARD(TLSLE_ADD_TPREL_LO12         , STATIC ,  AARCH64   ,    Y,  -1,    0,12               ,    0,11 , Symbol::ABSOLUTE_REF ,                         ADD   )
-ARD(TLSLE_ADD_TPREL_LO12_NC      , STATIC ,  AARCH64   ,    Y,  -1,    0,0                ,    0,11 , Symbol::ABSOLUTE_REF ,                         ADD   )
+ARD(TLSLE_ADD_TPREL_HI12         , STATIC ,  AARCH64   ,    Y,  -1,    0,24               ,   12,23 , Symbol::TLS_REF ,                              ADD   )
+ARD(TLSLE_ADD_TPREL_LO12         , STATIC ,  AARCH64   ,    Y,  -1,    0,12               ,    0,11 , Symbol::TLS_REF ,                              ADD   )
+ARD(TLSLE_ADD_TPREL_LO12_NC      , STATIC ,  AARCH64   ,    Y,  -1,    0,0                ,    0,11 , Symbol::TLS_REF ,                              ADD   )
 // Above is from Table 4-18, Local Exec TLS relocations, 544-571.
 
-ARD(TLSDESC_ADR_PAGE21           , STATIC ,  AARCH64   ,    Y,  -1,    32,32              ,   12,32 , Symbol::RELATIVE_REF , ADRP )
-ARD(TLSDESC_LD64_LO12            , STATIC ,  AARCH64   ,    Y,  -1,    0,RL_CHECK_ALIGN8  ,    3,11 , Symbol::ABSOLUTE_REF , LDST )
-ARD(TLSDESC_ADD_LO12             , STATIC ,  AARCH64   ,    Y,  -1,    0,0                ,    0,11 , Symbol::ABSOLUTE_REF , ADD )
-ARD(TLSDESC_CALL                 , STATIC ,  CFLOW     ,    Y,  -1,    0,0                ,    0,0  , (Symbol::FUNCTION_CALL|Symbol::ABSOLUTE_REF) , CALL )
+ARD(TLSDESC_ADR_PAGE21           , STATIC ,  AARCH64   ,    Y,  -1,    32,32              ,   12,32 , Symbol::TLS_REF ,                              ADRP  )
+ARD(TLSDESC_LD64_LO12            , STATIC ,  AARCH64   ,    Y,  -1,    0,RL_CHECK_ALIGN8  ,    3,11 , Symbol::TLS_REF ,                              LDST  )
+ARD(TLSDESC_ADD_LO12             , STATIC ,  AARCH64   ,    Y,  -1,    0,0                ,    0,11 , Symbol::TLS_REF ,                              ADD   )
+ARD(TLSDESC_CALL                 , STATIC ,  CFLOW     ,    Y,  -1,    0,0                ,    0,0  , Symbol::TLS_REF ,                              CALL  )
 // Above is from Table 4-19, TLS descriptor relocations, 560-569.
 
 // Note -