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Commit Graph

1 Commits (master)

Author	SHA1	Message	Date
Peter Johnson	0cdfa29994	Add a feature and fix a long-standing bug in Win64 output. The new feature ... is support for cross-section relative symbol references using "sym-$". This generates a 32-bit relative relocation similar to those used for cross-section jumps and calls. The bugfix is that in Win64 output, RIP-relative relocations do something special when there is an immediate value (or anything else) between the value being relocated and the next instruction. E.g. "shl dword [sym wrt rip], 5" needs to generate a REL32_1 relocation thanks to the immediate byte following the RIP-relative value. * symrec.c (sym_type): add SYM_CURPOS to track labels representing the current assembly position (e.g. $ in NASM, . in GAS). (yasm_symtab_define_curpos): New function to create symbols of this type. (yasm_symrec_is_curpos): Check to see if symbol is SYM_CURPOS type. (yasm_symrec_get_label, yasm_symrec_print): Update to handle SYM_CURPOS. * symrec.h (yasm_symtab_define_curpos): Prototype. (yasm_symrec_is_curpos): Prototype. * gas-bison.y: Use yasm_symtab_define_curpos when defining '.'. * nasm-bison.y: Use yasm_symtab_define_curpos when defining '$'. * value.c (yasm_value_finalize_expr): Look for cross-section "sym-SYM_CURPOS" combinations and generate curpos-relative value if found. * coretype.h (yasm_value): Add ip_rel member to designate that curpos_rel is set due to the value being IP-relative (rather than sym-curpos). * value.h (yasm_value_initialize, yasm_value_init_sym): Initialize ip_rel. * x86expr.c (yasm_x86__check_ea): Set ip_rel in addition to curpos_rel if detected WRT rip. * x86bc.c (x86_bc_insn_tobytes): Use ip_rel instead of curpos_rel when adjusting for RIP-relative. * coff-objfmt.c (coff_objfmt_output_value): Properly adjust output and generate correct relocations for both curpos_rel and ip_rel. This includes new generation of REL32_1, REL32_2, etc relocations. * symrec.c, symrec.h (yasm_symtab_define_label2): Delete. * coff-objfmt.c (stabs_debgfmt_generate_sections): Change to use yasm_symtab_define_label() instead. * win32-curpos.asm, win64-curpos.asm, curpos.asm, curpos-err.asm, elf_gas64_curpos.asm: New tests for above. svn path=/trunk/yasm/; revision=1423	19 years ago