From 11b861d510c23a2bf98e8bb909e922c98c9492e0 Mon Sep 17 00:00:00 2001 From: Doug Kwan Date: Sat, 30 Jan 2010 00:11:00 +0000 Subject: [PATCH] 2010-01-29 Viktor Kutuzov * gold/arm.cc: Added support for the ARM relocations: R_ARM_THM_PC8, R_ARM_THM_PC12, R_ARM_THM_ALU_PREL_11_0. (Arm_relocate_functions::thm_alu11): New Method. (Arm_relocate_functions::thm_pc8): New Method. (Arm_relocate_functions::thm_pc12): New Method. (Target_arm::Scan::local): Handle the relocations. (Target_arm::Scan::global): Likewise. (Target_arm::Relocate::relocate): Likewise. (Target_arm:Relocatable_size_for_reloc::get_size_for_reloc): Likewise. --- gold/ChangeLog | 12 +++++ gold/arm.cc | 137 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 146 insertions(+), 3 deletions(-) diff --git a/gold/ChangeLog b/gold/ChangeLog index eff9305..861ae2a 100644 --- a/gold/ChangeLog +++ b/gold/ChangeLog @@ -1,3 +1,15 @@ +2010-01-29 Viktor Kutuzov + + * gold/arm.cc: Added support for the ARM relocations: R_ARM_THM_PC8, + R_ARM_THM_PC12, R_ARM_THM_ALU_PREL_11_0. + (Arm_relocate_functions::thm_alu11): New Method. + (Arm_relocate_functions::thm_pc8): New Method. + (Arm_relocate_functions::thm_pc12): New Method. + (Target_arm::Scan::local): Handle the relocations. + (Target_arm::Scan::global): Likewise. + (Target_arm::Relocate::relocate): Likewise. + (Target_arm:Relocatable_size_for_reloc::get_size_for_reloc): Likewise. + 2010-01-29 Doug Kwan * arm.cc (Target_arm::Scan::global): General PLTs for the same set diff --git a/gold/arm.cc b/gold/arm.cc index 7736fa6..90deaa6 100644 --- a/gold/arm.cc +++ b/gold/arm.cc @@ -101,13 +101,10 @@ const int32_t THM2_MAX_BWD_BRANCH_OFFSET = (-(1 << 24) + 4); // TODOs: // - Support the following relocation types as needed: // R_ARM_SBREL32 -// R_ARM_THM_PC8 // R_ARM_LDR_SBREL_11_0_NC // R_ARM_ALU_SBREL_19_12_NC // R_ARM_ALU_SBREL_27_20_CK // R_ARM_SBREL31 -// R_ARM_THM_ALU_PREL_11_0 -// R_ARM_THM_PC12 // R_ARM_REL32_NOI // R_ARM_PLT32_ABS // R_ARM_GOT_ABS @@ -3179,6 +3176,115 @@ class Arm_relocate_functions : public Relocate_functions<32, big_endian> return This::STATUS_OKAY; } + // R_ARM_THM_ALU_PREL_11_0: ((S + A) | T) - Pa (Thumb32) + static inline typename This::Status + thm_alu11(unsigned char* view, + const Sized_relobj<32, big_endian>* object, + const Symbol_value<32>* psymval, + Arm_address address, + Arm_address thumb_bit) + { + typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; + typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; + Valtype* wv = reinterpret_cast(view); + Reltype insn = (elfcpp::Swap<16, big_endian>::readval(wv) << 16) + | elfcpp::Swap<16, big_endian>::readval(wv + 1); + + // f e d c b|a|9|8 7 6 5|4|3 2 1 0||f|e d c|b a 9 8|7 6 5 4 3 2 1 0 + // ----------------------------------------------------------------------- + // ADD{S} 1 1 1 1 0|i|0|1 0 0 0|S|1 1 0 1||0|imm3 |Rd |imm8 + // ADDW 1 1 1 1 0|i|1|0 0 0 0|0|1 1 0 1||0|imm3 |Rd |imm8 + // ADR[+] 1 1 1 1 0|i|1|0 0 0 0|0|1 1 1 1||0|imm3 |Rd |imm8 + // SUB{S} 1 1 1 1 0|i|0|1 1 0 1|S|1 1 0 1||0|imm3 |Rd |imm8 + // SUBW 1 1 1 1 0|i|1|0 1 0 1|0|1 1 0 1||0|imm3 |Rd |imm8 + // ADR[-] 1 1 1 1 0|i|1|0 1 0 1|0|1 1 1 1||0|imm3 |Rd |imm8 + + // Determine a sign for the addend. + const int sign = ((insn & 0xf8ef0000) == 0xf0ad0000 + || (insn & 0xf8ef0000) == 0xf0af0000) ? -1 : 1; + // Thumb2 addend encoding: + // imm12 := i | imm3 | imm8 + int32_t addend = (insn & 0xff) + | ((insn & 0x00007000) >> 4) + | ((insn & 0x04000000) >> 15); + // Apply a sign to the added. + addend *= sign; + + int32_t x = (psymval->value(object, addend) | thumb_bit) + - (address & 0xfffffffc); + Reltype val = abs(x); + // Mask out the value and a distinct part of the ADD/SUB opcode + // (bits 7:5 of opword). + insn = (insn & 0xfb0f8f00) + | (val & 0xff) + | ((val & 0x700) << 4) + | ((val & 0x800) << 15); + // Set the opcode according to whether the value to go in the + // place is negative. + if (x < 0) + insn |= 0x00a00000; + + elfcpp::Swap<16, big_endian>::writeval(wv, insn >> 16); + elfcpp::Swap<16, big_endian>::writeval(wv + 1, insn & 0xffff); + return ((val > 0xfff) ? + This::STATUS_OVERFLOW : This::STATUS_OKAY); + } + + // R_ARM_THM_PC8: S + A - Pa (Thumb) + static inline typename This::Status + thm_pc8(unsigned char* view, + const Sized_relobj<32, big_endian>* object, + const Symbol_value<32>* psymval, + Arm_address address) + { + typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; + typedef typename elfcpp::Swap<16, big_endian>::Valtype Reltype; + Valtype* wv = reinterpret_cast(view); + Valtype insn = elfcpp::Swap<16, big_endian>::readval(wv); + Reltype addend = ((insn & 0x00ff) << 2); + int32_t x = (psymval->value(object, addend) - (address & 0xfffffffc)); + Reltype val = abs(x); + insn = (insn & 0xff00) | ((val & 0x03fc) >> 2); + + elfcpp::Swap<16, big_endian>::writeval(wv, insn); + return ((val > 0x03fc) + ? This::STATUS_OVERFLOW + : This::STATUS_OKAY); + } + + // R_ARM_THM_PC12: S + A - Pa (Thumb32) + static inline typename This::Status + thm_pc12(unsigned char* view, + const Sized_relobj<32, big_endian>* object, + const Symbol_value<32>* psymval, + Arm_address address) + { + typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; + typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; + Valtype* wv = reinterpret_cast(view); + Reltype insn = (elfcpp::Swap<16, big_endian>::readval(wv) << 16) + | elfcpp::Swap<16, big_endian>::readval(wv + 1); + // Determine a sign for the addend (positive if the U bit is 1). + const int sign = (insn & 0x00800000) ? 1 : -1; + int32_t addend = (insn & 0xfff); + // Apply a sign to the added. + addend *= sign; + + int32_t x = (psymval->value(object, addend) - (address & 0xfffffffc)); + Reltype val = abs(x); + // Mask out and apply the value and the U bit. + insn = (insn & 0xff7ff000) | (val & 0xfff); + // Set the U bit according to whether the value to go in the + // place is positive. + if (x >= 0) + insn |= 0x00800000; + + elfcpp::Swap<16, big_endian>::writeval(wv, insn >> 16); + elfcpp::Swap<16, big_endian>::writeval(wv + 1, insn & 0xffff); + return ((val > 0xfff) ? + This::STATUS_OVERFLOW : This::STATUS_OKAY); + } + // R_ARM_V4BX static inline typename This::Status v4bx(const Relocate_info<32, big_endian>* relinfo, @@ -6578,6 +6684,9 @@ Target_arm::Scan::local(Symbol_table* symtab, case elfcpp::R_ARM_THM_JUMP8: case elfcpp::R_ARM_THM_JUMP11: case elfcpp::R_ARM_V4BX: + case elfcpp::R_ARM_THM_PC8: + case elfcpp::R_ARM_THM_PC12: + case elfcpp::R_ARM_THM_ALU_PREL_11_0: case elfcpp::R_ARM_ALU_PC_G0_NC: case elfcpp::R_ARM_ALU_PC_G0: case elfcpp::R_ARM_ALU_PC_G1_NC: @@ -6744,6 +6853,9 @@ Target_arm::Scan::global(Symbol_table* symtab, case elfcpp::R_ARM_THM_JUMP8: case elfcpp::R_ARM_THM_JUMP11: case elfcpp::R_ARM_V4BX: + case elfcpp::R_ARM_THM_PC8: + case elfcpp::R_ARM_THM_PC12: + case elfcpp::R_ARM_THM_ALU_PREL_11_0: case elfcpp::R_ARM_ALU_PC_G0_NC: case elfcpp::R_ARM_ALU_PC_G0: case elfcpp::R_ARM_ALU_PC_G1_NC: @@ -7523,6 +7635,22 @@ Target_arm::Relocate::relocate( } break; + case elfcpp::R_ARM_THM_PC8: + reloc_status = + Arm_relocate_functions::thm_pc8(view, object, psymval, address); + break; + + case elfcpp::R_ARM_THM_PC12: + reloc_status = + Arm_relocate_functions::thm_pc12(view, object, psymval, address); + break; + + case elfcpp::R_ARM_THM_ALU_PREL_11_0: + reloc_status = + Arm_relocate_functions::thm_alu11(view, object, psymval, address, + thumb_bit); + break; + case elfcpp::R_ARM_ALU_PC_G0_NC: reloc_status = Arm_relocate_functions::arm_grp_alu(view, object, psymval, 0, @@ -7815,6 +7943,7 @@ Target_arm::Relocatable_size_for_reloc::get_size_for_reloc( case elfcpp::R_ARM_THM_JUMP6: case elfcpp::R_ARM_THM_JUMP8: case elfcpp::R_ARM_THM_JUMP11: + case elfcpp::R_ARM_THM_PC8: return 2; case elfcpp::R_ARM_ABS32: @@ -7846,6 +7975,8 @@ Target_arm::Relocatable_size_for_reloc::get_size_for_reloc( case elfcpp::R_ARM_THM_MOVT_BREL: case elfcpp::R_ARM_THM_MOVW_BREL: case elfcpp::R_ARM_V4BX: + case elfcpp::R_ARM_THM_PC12: + case elfcpp::R_ARM_THM_ALU_PREL_11_0: case elfcpp::R_ARM_ALU_PC_G0_NC: case elfcpp::R_ARM_ALU_PC_G0: case elfcpp::R_ARM_ALU_PC_G1_NC: -- 2.7.4