2022-11-23 10:22:48 +08:00
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/* codeview.h - CodeView debug support
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2024-01-04 19:52:08 +08:00
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Copyright (C) 2022-2024 Free Software Foundation, Inc.
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2022-11-23 10:22:48 +08:00
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This file is part of GAS, the GNU Assembler.
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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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/* Header files referred to below can be found in Microsoft's PDB
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repository: https://github.com/microsoft/microsoft-pdb. */
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#ifndef GAS_CODEVIEW_H
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#define GAS_CODEVIEW_H
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#define CV_SIGNATURE_C13 4
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#define DEBUG_S_SYMBOLS 0xf1
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#define DEBUG_S_LINES 0xf2
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#define DEBUG_S_STRINGTABLE 0xf3
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#define DEBUG_S_FILECHKSMS 0xf4
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#define S_OBJNAME 0x1101
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#define S_COMPILE3 0x113c
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#define CV_CFL_MASM 0x03
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#define CV_CFL_80386 0x03
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#define CV_CFL_X64 0xD0
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2023-01-26 07:54:37 +08:00
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#define CV_CFL_ARM64 0xF6
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2022-11-23 10:22:48 +08:00
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#define CHKSUM_TYPE_MD5 1
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/* OBJNAMESYM in cvinfo.h */
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struct OBJNAMESYM
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{
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uint16_t length;
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uint16_t type;
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uint32_t signature;
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};
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/* COMPILESYM3 in cvinfo.h */
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struct COMPILESYM3
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{
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uint16_t length;
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uint16_t type;
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uint32_t flags;
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uint16_t machine;
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uint16_t frontend_major;
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uint16_t frontend_minor;
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uint16_t frontend_build;
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uint16_t frontend_qfe;
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uint16_t backend_major;
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uint16_t backend_minor;
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uint16_t backend_build;
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uint16_t backend_qfe;
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} ATTRIBUTE_PACKED;
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/* filedata in dumpsym7.cpp */
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struct file_checksum
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{
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uint32_t file_id;
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uint8_t checksum_length;
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uint8_t checksum_type;
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} ATTRIBUTE_PACKED;
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/* CV_DebugSLinesHeader_t in cvinfo.h */
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struct cv_lines_header
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{
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uint32_t offset;
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uint16_t section;
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uint16_t flags;
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uint32_t length;
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};
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/* CV_DebugSLinesFileBlockHeader_t in cvinfo.h */
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struct cv_lines_block
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{
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uint32_t file_id;
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uint32_t num_lines;
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uint32_t length;
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};
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/* CV_Line_t in cvinfo.h */
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struct cv_line
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{
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uint32_t offset;
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uint32_t line_no;
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};
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extern void codeview_finish (void);
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extern void codeview_generate_asm_lineno (void);
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gas: add .cv_ucomp and .cv_scomp pseudo-directives
Add .cv_ucomp and .cv_scomp pseudo-directives for object files for
Windows targets, which encode compressed CodeView integers according to
the algorithm in CVCompressData in
https://github.com/Microsoft/microsoft-pdb/blob/master/include/cvinfo.h.
This is essentially Microsoft's answer to the LEB128, though used in far
fewer places.
CodeView uses these to encode the "binary annotations" in the
S_INLINESITE symbol, which express the relationship between code offsets
and line numbers in inlined functions. This has to be done in the
assembler as GCC doesn't know how many bytes each instruction takes up.
There's no equivalent for this for MSVC or LLVM, as in both cases the
assembler and compiler are integrated.
.cv_ucomp represents an unsigned big-endian integer between 0 and 0x1fffffff,
taking up 1, 2, or 4 bytes:
Value between 0 and 0x7f:
0aaaaaaa -> 0aaaaaaa (identity-mapped)
Value between 0x80 and 0x3fff:
00aaaaaa bbbbbbbb -> 10aaaaaa bbbbbbbb
Value between 0x4000 and 0x1fffffff:
000aaaaa bbbbbbbb ccccccccc dddddddd ->
110aaaaa bbbbbbbb ccccccccc dddddddd
.cv_scomp represents a signed big-endian integer between -0xfffffff and
0xfffffff, encoded according to EncodeSignedInt32 in cvinfo.h. The
absolute value of the integer is shifted left one bit, the LSB set
for a negative value, and the result expressed as if it were a
.cv_ucomp: cv_scomp(x) = cv_ucomp((abs(x) << 1) | (x < 0 ? 1 : 0))
2024-11-03 06:05:06 +08:00
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extern unsigned int output_cv_comp (char *, offsetT, int);
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extern unsigned int sizeof_cv_comp (offsetT, int);
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2022-11-23 10:22:48 +08:00
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#endif
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