681418c21c
(symtab, symptr, reltab, relcount, relsize): Remove. (seh_ctx_root, seh_ctx): Remove. (xdata_seg, xdata_subseg, pdata_seg): New. (switch_xdata, switch_pdata): New. (verify_context, verify_context_and_target, skip_whitespace_and_comma): New parsing functions. Rewrite all parsing functions to use them. (obj_coff_seh_32): Fix != arm thinko. (obj_coff_seh_handler): For x64, don't accept handler pointer here, only flags. (obj_coff_seh_handlerdata): New. (do_seh_endproc): Split out of ... (obj_coff_seh_endproc): ... here. (obj_coff_seh_proc): Use it, if needed. (seh_x64_make_prologue_element): Use XRESIZEVEC, symbol_temp_new_now. (seh_x64_read_reg): Remove mm_regs alternative. Tidy integer reg alternatives. Don't slurp commas. (seh_read_offset): Remove. (obj_coff_seh_pushframe): Split out from obj_coff_seh_push. (obj_coff_seh_scope): Remove. (obj_coff_seh_save): Decide UWOP_SAVE_* vs _FAR immediately. (obj_coff_seh_stackalloc): Decide _SMALL vs _LARGE immediately. (out_one, out_two, out_four): New. (seh_x64_write_prologue_data, seh_x64_size_prologue_data, seh_x64_write_function_xdata, write_function_xdata): Rewrite from seh_x64_write_xdata, seh_needed_unwind_info, seh_store_elm_data, seh_getelm_data_size, seh_getsize_of_unwind_entry, seh_make_unwind_entry, seh_getsize_unwind_data, and seh_create_unwind_data. (seh_arm_write_function_pdata): Rewrite from seh_arm_create_pdata. (write_function_pdata): Rewrite from make_function_entry_pdata. (seh_write_text_eh_data, make_function_entry_pdata, seh_arm_create_pdata, seh_arm_write_pdata, seh_reloc, save_relocs, seh_symbol_init, seh_symbol, quick_section, seh_emit_rva, seh_emit_long, seh_make_globl, seh_make_section2, seh_make_section, seh_make_xlbl_name, make_seh_text_label, seh_fill_pcsyms, seh_needed_unwind_info, seh_store_elm_data, seh_getelm_data_size, seh_getsize_of_unwind_entry, seh_make_unwind_entry, seh_getsize_unwind_data, seh_create_unwind_data, seh_make_function_entry_xdata, seh_x64_makescope_elem): Remove. * config/obj-coff-seh.h (SEH_CMDS): Remove seh_savemm, seh_scope. Add seh_handlerdata. Adjust function/what arguments for seh_savereg, seh_pushframe, seh_stackalloc. (struct seh_prologue_element): Adjust members to closer match the elements of the UNWIND_CODE structure. (struct seh_scope_elem): Remove. (struct seh_context): Replace char* members with symbolS or expressionS as appropriate. Sort members by ARM/x64 applicability. Remove obsolete stuff wrt direct symbol and reloc manipulation.
879 lines
20 KiB
C
879 lines
20 KiB
C
/* seh pdata/xdata coff object file format
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Copyright 2009, 2010
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Free Software Foundation, Inc.
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This file is part of GAS.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "obj-coff-seh.h"
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/* Local data. */
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static seh_context *seh_ctx_cur = NULL;
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static segT xdata_seg;
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static segT pdata_seg;
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static int xdata_subseg;
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static void write_function_xdata (seh_context *);
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static void write_function_pdata (seh_context *);
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static void
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switch_xdata (int subseg)
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{
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if (xdata_seg == NULL)
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{
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xdata_seg = subseg_new (".xdata", 0);
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bfd_set_section_flags (stdoutput, xdata_seg,
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((SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA)
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& bfd_applicable_section_flags (stdoutput)));
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}
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subseg_set (xdata_seg, subseg);
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}
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static void
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switch_pdata (void)
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{
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if (pdata_seg == NULL)
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{
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pdata_seg = subseg_new (".pdata", 0);
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bfd_set_section_flags (stdoutput, pdata_seg,
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((SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_DATA)
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& bfd_applicable_section_flags (stdoutput)));
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}
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else
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subseg_set (pdata_seg, 0);
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}
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/* Parsing routines. */
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/* Return the style of SEH unwind info to generate. */
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static seh_kind
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seh_get_target_kind (void)
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{
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if (!stdoutput)
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return seh_kind_unknown;
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switch (bfd_get_arch (stdoutput))
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{
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case bfd_arch_arm:
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case bfd_arch_powerpc:
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case bfd_arch_sh:
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return seh_kind_arm;
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case bfd_arch_i386:
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switch (bfd_get_mach (stdoutput))
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{
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case bfd_mach_x86_64:
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case bfd_mach_x86_64_intel_syntax:
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return seh_kind_x64;
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default:
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break;
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}
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/* FALL THROUGH. */
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case bfd_arch_mips:
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return seh_kind_mips;
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case bfd_arch_ia64:
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/* Should return seh_kind_x64. But not implemented yet. */
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return seh_kind_unknown;
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default:
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break;
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}
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return seh_kind_unknown;
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}
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/* Verify that we're in the context of a seh_proc. */
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static int
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verify_context (const char *directive)
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{
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if (seh_ctx_cur == NULL)
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{
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as_bad (_("%s used outside of .seh_proc block"), directive);
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ignore_rest_of_line ();
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return 0;
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}
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return 1;
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}
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/* Similar, except we also verify the appropriate target. */
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static int
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verify_context_and_target (const char *directive, seh_kind target)
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{
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if (seh_get_target_kind () != target)
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{
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as_warn (_("%s ignored for this target"), directive);
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ignore_rest_of_line ();
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return 0;
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}
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return verify_context (directive);
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}
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/* Skip whitespace and a comma. Error if the comma is not seen. */
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static int
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skip_whitespace_and_comma (int required)
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{
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SKIP_WHITESPACE ();
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if (*input_line_pointer == ',')
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{
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input_line_pointer++;
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SKIP_WHITESPACE ();
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return 1;
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}
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else if (required)
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{
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as_bad (_("missing separator"));
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ignore_rest_of_line ();
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}
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else
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demand_empty_rest_of_line ();
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return 0;
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}
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/* Mark current context to use 32-bit instruction (arm). */
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static void
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obj_coff_seh_32 (int what)
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{
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if (!verify_context_and_target ((what ? ".seh_32" : ".seh_no32"),
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seh_kind_arm))
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return;
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seh_ctx_cur->use_instruction_32 = (what ? 1 : 0);
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demand_empty_rest_of_line ();
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}
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/* Set for current context the handler and optional data (arm). */
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static void
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obj_coff_seh_eh (int what ATTRIBUTE_UNUSED)
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{
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if (!verify_context_and_target (".seh_eh", seh_kind_arm))
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return;
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/* Write block to .text if exception handler is set. */
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seh_ctx_cur->handler_written = 1;
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emit_expr (&seh_ctx_cur->handler, 4);
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emit_expr (&seh_ctx_cur->handler_data, 4);
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demand_empty_rest_of_line ();
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}
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/* Set for current context the default handler (x64). */
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static void
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obj_coff_seh_handler (int what ATTRIBUTE_UNUSED)
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{
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char *symbol_name;
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char name_end;
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if (!verify_context (".seh_handler"))
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return;
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if (*input_line_pointer == 0 || *input_line_pointer == '\n')
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{
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as_bad (_(".seh_handler requires a handler"));
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demand_empty_rest_of_line ();
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return;
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}
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SKIP_WHITESPACE ();
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if (*input_line_pointer == '@')
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{
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symbol_name = input_line_pointer;
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name_end = get_symbol_end ();
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seh_ctx_cur->handler.X_op = O_constant;
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seh_ctx_cur->handler.X_add_number = 0;
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if (strcasecmp (symbol_name, "@0") == 0
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|| strcasecmp (symbol_name, "@null") == 0)
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;
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else if (strcasecmp (symbol_name, "@1") == 0)
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seh_ctx_cur->handler.X_add_number = 1;
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else
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as_bad (_("unknown constant value '%s' for handler"), symbol_name);
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*input_line_pointer = name_end;
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}
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else
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expression (&seh_ctx_cur->handler);
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seh_ctx_cur->handler_data.X_op = O_constant;
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seh_ctx_cur->handler_data.X_add_number = 0;
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seh_ctx_cur->handler_flags = 0;
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if (!skip_whitespace_and_comma (0))
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return;
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if (seh_get_target_kind () == seh_kind_x64)
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{
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do
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{
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symbol_name = input_line_pointer;
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name_end = get_symbol_end ();
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if (strcasecmp (symbol_name, "@unwind") == 0)
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seh_ctx_cur->handler_flags |= UNW_FLAG_UHANDLER;
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else if (strcasecmp (symbol_name, "@except") == 0)
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seh_ctx_cur->handler_flags |= UNW_FLAG_EHANDLER;
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else
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as_bad (_(".seh_handler constant '%s' unknown"), symbol_name);
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*input_line_pointer = name_end;
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}
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while (skip_whitespace_and_comma (0));
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}
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else
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{
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expression (&seh_ctx_cur->handler_data);
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demand_empty_rest_of_line ();
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if (seh_ctx_cur->handler_written)
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as_warn (_(".seh_handler after .seh_eh is ignored"));
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}
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}
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/* Switch to subsection for handler data for exception region (x64). */
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static void
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obj_coff_seh_handlerdata (int what ATTRIBUTE_UNUSED)
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{
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if (!verify_context_and_target (".seh_handlerdata", seh_kind_x64))
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return;
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demand_empty_rest_of_line ();
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switch_xdata (seh_ctx_cur->subsection + 1);
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}
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/* Mark end of current context. */
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static void
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do_seh_endproc (void)
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{
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seh_ctx_cur->end_addr = symbol_temp_new_now ();
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write_function_xdata (seh_ctx_cur);
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write_function_pdata (seh_ctx_cur);
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seh_ctx_cur = NULL;
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}
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static void
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obj_coff_seh_endproc (int what ATTRIBUTE_UNUSED)
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{
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demand_empty_rest_of_line ();
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if (seh_ctx_cur == NULL)
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{
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as_bad (_(".seh_endproc used without .seh_proc"));
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return;
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}
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do_seh_endproc ();
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}
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/* Mark begin of new context. */
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static void
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obj_coff_seh_proc (int what ATTRIBUTE_UNUSED)
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{
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char *symbol_name;
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char name_end;
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if (seh_ctx_cur != NULL)
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{
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as_bad (_("previous SEH entry not closed (missing .seh_endproc)"));
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do_seh_endproc ();
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}
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if (*input_line_pointer == 0 || *input_line_pointer == '\n')
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{
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as_bad (_(".seh_proc requires function label name"));
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demand_empty_rest_of_line ();
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return;
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}
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seh_ctx_cur = XCNEW (seh_context);
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if (seh_get_target_kind () == seh_kind_x64)
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{
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seh_ctx_cur->subsection = xdata_subseg;
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xdata_subseg += 2;
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}
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SKIP_WHITESPACE ();
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symbol_name = input_line_pointer;
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name_end = get_symbol_end ();
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seh_ctx_cur->func_name = xstrdup (symbol_name);
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*input_line_pointer = name_end;
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demand_empty_rest_of_line ();
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seh_ctx_cur->start_addr = symbol_temp_new_now ();
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}
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/* Mark end of prologue for current context. */
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static void
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obj_coff_seh_endprologue (int what ATTRIBUTE_UNUSED)
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{
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if (!verify_context (".seh_endprologue"))
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return;
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demand_empty_rest_of_line ();
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if (seh_ctx_cur->endprologue_addr != NULL)
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as_warn (_("duplicate .seh_endprologue in .seh_proc block"));
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else
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seh_ctx_cur->endprologue_addr = symbol_temp_new_now ();
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}
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/* End-of-file hook. */
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void
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obj_coff_seh_do_final (void)
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{
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if (seh_ctx_cur != NULL)
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{
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as_bad (_("open SEH entry at end of file (missing .cfi_endproc)"));
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do_seh_endproc ();
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}
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}
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/* Enter a prologue element into current context (x64). */
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static void
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seh_x64_make_prologue_element (int code, int info, offsetT off)
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{
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seh_prologue_element *n;
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if (seh_ctx_cur == NULL)
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return;
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if (seh_ctx_cur->elems_count == seh_ctx_cur->elems_max)
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{
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seh_ctx_cur->elems_max += 8;
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seh_ctx_cur->elems = XRESIZEVEC (seh_prologue_element,
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seh_ctx_cur->elems,
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seh_ctx_cur->elems_max);
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}
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n = &seh_ctx_cur->elems[seh_ctx_cur->elems_count++];
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n->code = code;
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n->info = info;
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n->off = off;
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n->pc_addr = symbol_temp_new_now ();
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}
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/* Helper to read a register name from input stream (x64). */
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static int
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seh_x64_read_reg (const char *directive, int kind)
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{
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static const char * const int_regs[16] =
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{ "rax", "rcx", "rdx", "rbx", "rsp", "rbp","rsi","rdi",
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"r8","r9","r10","r11","r12","r13","r14","r15" };
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static const char * const xmm_regs[16] =
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{ "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7",
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"xmm8", "xmm9", "xmm10","xmm11","xmm12","xmm13","xmm14","xmm15" };
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const char * const *regs = NULL;
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char name_end;
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char *symbol_name = NULL;
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int i;
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switch (kind)
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{
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case 0:
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case 1:
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regs = int_regs;
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break;
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case 2:
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regs = xmm_regs;
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break;
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default:
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abort ();
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}
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SKIP_WHITESPACE ();
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if (*input_line_pointer == '%')
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++input_line_pointer;
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symbol_name = input_line_pointer;
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name_end = get_symbol_end ();
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for (i = 0; i < 16; i++)
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if (! strcasecmp (regs[i], symbol_name))
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break;
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*input_line_pointer = name_end;
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/* Error if register not found, or EAX used as a frame pointer. */
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if (i == 16 || (kind == 0 && i == 0))
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{
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as_bad (_("invalid register for %s"), directive);
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return -1;
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}
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return i;
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}
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/* Add a register push-unwind token to the current context. */
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static void
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obj_coff_seh_pushreg (int what ATTRIBUTE_UNUSED)
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{
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int reg;
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if (!verify_context_and_target (".seh_pushreg", seh_kind_x64))
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return;
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reg = seh_x64_read_reg (".seh_pushreg", 1);
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demand_empty_rest_of_line ();
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if (reg < 0)
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return;
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seh_x64_make_prologue_element (UWOP_PUSH_NONVOL, reg, 0);
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}
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/* Add a register frame-unwind token to the current context. */
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static void
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obj_coff_seh_pushframe (int what ATTRIBUTE_UNUSED)
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{
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if (!verify_context_and_target (".seh_pushframe", seh_kind_x64))
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return;
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demand_empty_rest_of_line ();
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seh_x64_make_prologue_element (UWOP_PUSH_MACHFRAME, 0, 0);
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}
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/* Add a register save-unwind token to current context. */
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static void
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obj_coff_seh_save (int what)
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{
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const char *directive = (what == 1 ? ".seh_savereg" : ".seh_savexmm");
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int code, reg, scale;
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offsetT off;
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if (!verify_context_and_target (directive, seh_kind_x64))
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return;
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reg = seh_x64_read_reg (directive, what);
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if (!skip_whitespace_and_comma (1))
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return;
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off = get_absolute_expression ();
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demand_empty_rest_of_line ();
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if (reg < 0)
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return;
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if (off < 0)
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{
|
||
as_bad (_("%s offset is negative"), directive);
|
||
return;
|
||
}
|
||
|
||
scale = (what == 1 ? 8 : 16);
|
||
|
||
if ((off & (scale - 1)) == 0 && off <= 0xffff * scale)
|
||
{
|
||
code = (what == 1 ? UWOP_SAVE_NONVOL : UWOP_SAVE_XMM128);
|
||
off /= scale;
|
||
}
|
||
else if (off < 0xffffffff)
|
||
code = (what == 1 ? UWOP_SAVE_NONVOL_FAR : UWOP_SAVE_XMM128_FAR);
|
||
else
|
||
{
|
||
as_bad (_("%s offset out of range"), directive);
|
||
return;
|
||
}
|
||
|
||
seh_x64_make_prologue_element (code, reg, off);
|
||
}
|
||
|
||
/* Add a stack-allocation token to current context. */
|
||
|
||
static void
|
||
obj_coff_seh_stackalloc (int what ATTRIBUTE_UNUSED)
|
||
{
|
||
offsetT off;
|
||
int code, info;
|
||
|
||
if (!verify_context_and_target (".seh_stackalloc", seh_kind_x64))
|
||
return;
|
||
|
||
off = get_absolute_expression ();
|
||
demand_empty_rest_of_line ();
|
||
|
||
if (off == 0)
|
||
return;
|
||
if (off < 0)
|
||
{
|
||
as_bad (_(".seh_stackalloc offset is negative"));
|
||
return;
|
||
}
|
||
|
||
if ((off & 7) == 0 && off <= 128)
|
||
code = UWOP_ALLOC_SMALL, info = (off - 8) >> 3, off = 0;
|
||
else if ((off & 7) == 0 && off <= 0xffff * 8)
|
||
code = UWOP_ALLOC_LARGE, info = 0, off >>= 3;
|
||
else if (off <= 0xffffffff)
|
||
code = UWOP_ALLOC_LARGE, info = 1;
|
||
else
|
||
{
|
||
as_bad (_(".seh_stackalloc offset out of range"));
|
||
return;
|
||
}
|
||
|
||
seh_x64_make_prologue_element (code, info, off);
|
||
}
|
||
|
||
/* Add a frame-pointer token to current context. */
|
||
|
||
static void
|
||
obj_coff_seh_setframe (int what ATTRIBUTE_UNUSED)
|
||
{
|
||
offsetT off;
|
||
int reg;
|
||
|
||
if (!verify_context_and_target (".seh_setframe", seh_kind_x64))
|
||
return;
|
||
|
||
reg = seh_x64_read_reg (".seh_setframe", 0);
|
||
|
||
if (!skip_whitespace_and_comma (1))
|
||
return;
|
||
|
||
off = get_absolute_expression ();
|
||
demand_empty_rest_of_line ();
|
||
|
||
if (reg < 0)
|
||
return;
|
||
if (off < 0)
|
||
as_bad (_(".seh_setframe offset is negative"));
|
||
else if (off > 240)
|
||
as_bad (_(".seh_setframe offset out of range"));
|
||
else if (off & 15)
|
||
as_bad (_(".seh_setframe offset not a multiple of 16"));
|
||
else if (seh_ctx_cur->framereg != 0)
|
||
as_bad (_("duplicate .seh_setframe in current .seh_proc"));
|
||
else
|
||
{
|
||
seh_ctx_cur->framereg = reg;
|
||
seh_ctx_cur->frameoff = off;
|
||
seh_x64_make_prologue_element (UWOP_SET_FPREG, 0, 0);
|
||
}
|
||
}
|
||
|
||
/* Data writing routines. */
|
||
|
||
/* Output raw integers in 1, 2, or 4 bytes. */
|
||
|
||
static inline void
|
||
out_one (int byte)
|
||
{
|
||
FRAG_APPEND_1_CHAR (byte);
|
||
}
|
||
|
||
static inline void
|
||
out_two (int data)
|
||
{
|
||
md_number_to_chars (frag_more (2), data, 2);
|
||
}
|
||
|
||
static inline void
|
||
out_four (int data)
|
||
{
|
||
md_number_to_chars (frag_more (4), data, 4);
|
||
}
|
||
|
||
/* Write out prologue data for x64. */
|
||
|
||
static void
|
||
seh_x64_write_prologue_data (const seh_context *c)
|
||
{
|
||
int i;
|
||
|
||
/* We have to store in reverse order. */
|
||
for (i = c->elems_count - 1; i >= 0; --i)
|
||
{
|
||
const seh_prologue_element *e = c->elems + i;
|
||
expressionS exp;
|
||
|
||
/* First comes byte offset in code. */
|
||
exp.X_op = O_subtract;
|
||
exp.X_add_symbol = e->pc_addr;
|
||
exp.X_op_symbol = c->start_addr;
|
||
exp.X_add_number = 0;
|
||
emit_expr (&exp, 1);
|
||
|
||
/* Second comes code+info packed into a byte. */
|
||
out_one ((e->info << 4) | e->code);
|
||
|
||
switch (e->code)
|
||
{
|
||
case UWOP_PUSH_NONVOL:
|
||
case UWOP_ALLOC_SMALL:
|
||
case UWOP_SET_FPREG:
|
||
case UWOP_PUSH_MACHFRAME:
|
||
/* These have no extra data. */
|
||
break;
|
||
|
||
case UWOP_ALLOC_LARGE:
|
||
if (e->info)
|
||
{
|
||
case UWOP_SAVE_NONVOL_FAR:
|
||
case UWOP_SAVE_XMM128_FAR:
|
||
/* An unscaled 4 byte offset. */
|
||
out_four (e->off);
|
||
break;
|
||
}
|
||
/* FALLTHRU */
|
||
|
||
case UWOP_SAVE_NONVOL:
|
||
case UWOP_SAVE_XMM128:
|
||
/* A scaled 2 byte offset. */
|
||
out_two (e->off);
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
}
|
||
|
||
static int
|
||
seh_x64_size_prologue_data (const seh_context *c)
|
||
{
|
||
int i, ret = 0;
|
||
|
||
for (i = c->elems_count - 1; i >= 0; --i)
|
||
switch (c->elems[i].code)
|
||
{
|
||
case UWOP_PUSH_NONVOL:
|
||
case UWOP_ALLOC_SMALL:
|
||
case UWOP_SET_FPREG:
|
||
case UWOP_PUSH_MACHFRAME:
|
||
ret += 1;
|
||
break;
|
||
|
||
case UWOP_SAVE_NONVOL:
|
||
case UWOP_SAVE_XMM128:
|
||
ret += 2;
|
||
break;
|
||
|
||
case UWOP_SAVE_NONVOL_FAR:
|
||
case UWOP_SAVE_XMM128_FAR:
|
||
ret += 3;
|
||
break;
|
||
|
||
case UWOP_ALLOC_LARGE:
|
||
ret += (c->elems[i].info ? 3 : 2);
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Write out the xdata information for one function (x64). */
|
||
|
||
static void
|
||
seh_x64_write_function_xdata (seh_context *c)
|
||
{
|
||
int flags, count_unwind_codes;
|
||
expressionS exp;
|
||
|
||
/* Set 4-byte alignment. */
|
||
frag_align (2, 0, 0);
|
||
|
||
c->xdata_addr = symbol_temp_new_now ();
|
||
flags = c->handler_flags;
|
||
count_unwind_codes = seh_x64_size_prologue_data (c);
|
||
|
||
/* ubyte:3 version, ubyte:5 flags. */
|
||
out_one ((flags << 3) | 1);
|
||
|
||
/* Size of prologue. */
|
||
if (c->endprologue_addr)
|
||
{
|
||
exp.X_op = O_subtract;
|
||
exp.X_add_symbol = c->endprologue_addr;
|
||
exp.X_op_symbol = c->start_addr;
|
||
exp.X_add_number = 0;
|
||
emit_expr (&exp, 1);
|
||
}
|
||
else
|
||
out_one (0);
|
||
|
||
/* Number of slots (i.e. shorts) in the unwind codes array. */
|
||
if (count_unwind_codes > 255)
|
||
as_fatal (_("too much unwind data in this .seh_proc"));
|
||
out_one (count_unwind_codes);
|
||
|
||
/* ubyte:4 frame-reg, ubyte:4 frame-reg-offset. */
|
||
/* Note that frameoff is already a multiple of 16, and therefore
|
||
the offset is already both scaled and shifted into place. */
|
||
out_one (c->frameoff | c->framereg);
|
||
|
||
seh_x64_write_prologue_data (c);
|
||
|
||
/* We need to align prologue data. */
|
||
if (count_unwind_codes & 1)
|
||
out_two (0);
|
||
|
||
if (flags & (UNW_FLAG_EHANDLER | UNW_FLAG_UHANDLER))
|
||
{
|
||
/* Force the use of segment-relative relocations instead of absolute
|
||
valued expressions. Don't adjust for constants (e.g. NULL). */
|
||
if (c->handler.X_op == O_symbol)
|
||
c->handler.X_op = O_symbol_rva;
|
||
emit_expr (&c->handler, 4);
|
||
}
|
||
|
||
/* Handler data will be tacked in here by subsections. */
|
||
}
|
||
|
||
/* Write out xdata for one function. */
|
||
|
||
static void
|
||
write_function_xdata (seh_context *c)
|
||
{
|
||
segT save_seg = now_seg;
|
||
int save_subseg = now_subseg;
|
||
|
||
/* MIPS, SH, ARM don't have xdata. */
|
||
if (seh_get_target_kind () != seh_kind_x64)
|
||
return;
|
||
|
||
switch_xdata (c->subsection);
|
||
|
||
seh_x64_write_function_xdata (c);
|
||
|
||
subseg_set (save_seg, save_subseg);
|
||
}
|
||
|
||
/* Write pdata section data for one function (arm). */
|
||
|
||
static void
|
||
seh_arm_write_function_pdata (seh_context *c)
|
||
{
|
||
expressionS exp;
|
||
unsigned int prol_len = 0, func_len = 0;
|
||
unsigned int val;
|
||
|
||
/* Start address of the function. */
|
||
exp.X_op = O_symbol;
|
||
exp.X_add_symbol = c->start_addr;
|
||
exp.X_add_number = 0;
|
||
emit_expr (&exp, 4);
|
||
|
||
exp.X_op = O_subtract;
|
||
exp.X_add_symbol = c->end_addr;
|
||
exp.X_op_symbol = c->start_addr;
|
||
exp.X_add_number = 0;
|
||
if (resolve_expression (&exp) && exp.X_op == O_constant)
|
||
func_len = exp.X_add_number;
|
||
else
|
||
as_bad (_(".seh_endproc in a different section from .seh_proc"));
|
||
|
||
if (c->endprologue_addr)
|
||
{
|
||
exp.X_op = O_subtract;
|
||
exp.X_add_symbol = c->endprologue_addr;
|
||
exp.X_op_symbol = c->start_addr;
|
||
exp.X_add_number = 0;
|
||
|
||
if (resolve_expression (&exp) && exp.X_op == O_constant)
|
||
prol_len = exp.X_add_number;
|
||
else
|
||
as_bad (_(".seh_endprologue in a different section from .seh_proc"));
|
||
}
|
||
|
||
/* Both function and prologue are in units of instructions. */
|
||
func_len >>= (c->use_instruction_32 ? 2 : 1);
|
||
prol_len >>= (c->use_instruction_32 ? 2 : 1);
|
||
|
||
/* Assemble the second word of the pdata. */
|
||
val = prol_len & 0xff;
|
||
val |= (func_len & 0x3fffff) << 8;
|
||
if (c->use_instruction_32)
|
||
val |= 0x40000000U;
|
||
if (c->handler_written)
|
||
val |= 0x80000000U;
|
||
out_four (val);
|
||
}
|
||
|
||
/* Write out pdata for one function. */
|
||
|
||
static void
|
||
write_function_pdata (seh_context *c)
|
||
{
|
||
expressionS exp;
|
||
segT save_seg = now_seg;
|
||
int save_subseg = now_subseg;
|
||
|
||
switch_pdata ();
|
||
|
||
switch (seh_get_target_kind ())
|
||
{
|
||
case seh_kind_x64:
|
||
exp.X_op = O_symbol_rva;
|
||
exp.X_add_number = 0;
|
||
|
||
exp.X_add_symbol = c->start_addr;
|
||
emit_expr (&exp, 4);
|
||
exp.X_add_symbol = c->end_addr;
|
||
emit_expr (&exp, 4);
|
||
exp.X_add_symbol = c->xdata_addr;
|
||
emit_expr (&exp, 4);
|
||
break;
|
||
|
||
case seh_kind_mips:
|
||
exp.X_op = O_symbol;
|
||
exp.X_add_number = 0;
|
||
|
||
exp.X_add_symbol = c->start_addr;
|
||
emit_expr (&exp, 4);
|
||
exp.X_add_symbol = c->end_addr;
|
||
emit_expr (&exp, 4);
|
||
|
||
emit_expr (&c->handler, 4);
|
||
emit_expr (&c->handler_data, 4);
|
||
|
||
exp.X_add_symbol = (c->endprologue_addr
|
||
? c->endprologue_addr
|
||
: c->start_addr);
|
||
emit_expr (&exp, 4);
|
||
break;
|
||
|
||
case seh_kind_arm:
|
||
seh_arm_write_function_pdata (c);
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
|
||
subseg_set (save_seg, save_subseg);
|
||
}
|