mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-23 18:14:13 +08:00
fd67aa1129
Adds two new external authors to etc/update-copyright.py to cover bfd/ax_tls.m4, and adds gprofng to dirs handled automatically, then updates copyright messages as follows: 1) Update cgen/utils.scm emitted copyrights. 2) Run "etc/update-copyright.py --this-year" with an extra external author I haven't committed, 'Kalray SA.', to cover gas testsuite files (which should have their copyright message removed). 3) Build with --enable-maintainer-mode --enable-cgen-maint=yes. 4) Check out */po/*.pot which we don't update frequently.
348 lines
14 KiB
C
348 lines
14 KiB
C
/* SFrame format description.
|
|
Copyright (C) 2022-2024 Free Software Foundation, Inc.
|
|
|
|
This file is part of libsframe.
|
|
|
|
libsframe is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 3, or (at your option) any later
|
|
version.
|
|
|
|
This program is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
See the GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; see the file COPYING. If not see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _SFRAME_H
|
|
#define _SFRAME_H
|
|
|
|
#include <sys/types.h>
|
|
#include <limits.h>
|
|
#include <stdint.h>
|
|
|
|
#include "ansidecl.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C"
|
|
{
|
|
#endif
|
|
|
|
/* SFrame format.
|
|
|
|
SFrame format is a simple format to represent the information needed
|
|
for generating vanilla backtraces. SFrame format keeps track of the
|
|
minimal necessary information needed for stack tracing:
|
|
- Canonical Frame Address (CFA)
|
|
- Frame Pointer (FP)
|
|
- Return Address (RA)
|
|
|
|
The SFrame section itself has the following structure:
|
|
|
|
+--------+------------+---------+
|
|
| file | function | frame |
|
|
| header | descriptor | row |
|
|
| | entries | entries |
|
|
+--------+------------+---------+
|
|
|
|
The file header stores a magic number and version information, flags, and
|
|
the byte offset of each of the sections relative to the end of the header
|
|
itself. The file header also specifies the total number of Function
|
|
Descriptor Entries, Frame Row Entries and length of the FRE sub-section.
|
|
|
|
Following the header is a list of Function Descriptor Entries (FDEs).
|
|
This list may be sorted if the flags in the file header indicate it to be
|
|
so. The sort order, if applicable, is the order of functions in the
|
|
.text.* sections in the resulting binary artifact. Each Function
|
|
Descriptor Entry specifies the start PC of a function, the size in bytes
|
|
of the function and an offset to its first Frame Row Entry (FRE). Each FDE
|
|
additionally also specifies the type of FRE it uses to encode the stack
|
|
trace information.
|
|
|
|
Next, the SFrame Frame Row Entry sub-section is a list of variable size
|
|
records. Each entry represents stack trace information for a set of PCs
|
|
of the function. A singular Frame Row Entry is a self-sufficient record
|
|
which contains information on how to generate stack trace from the
|
|
applicable set of PCs.
|
|
|
|
*/
|
|
|
|
|
|
/* SFrame format versions. */
|
|
#define SFRAME_VERSION_1 1
|
|
#define SFRAME_VERSION_2 2
|
|
/* SFrame magic number. */
|
|
#define SFRAME_MAGIC 0xdee2
|
|
/* Current version of SFrame format. */
|
|
#define SFRAME_VERSION SFRAME_VERSION_2
|
|
|
|
/* Various flags for SFrame. */
|
|
|
|
/* Function Descriptor Entries are sorted on PC. */
|
|
#define SFRAME_F_FDE_SORTED 0x1
|
|
/* Functions preserve frame pointer. */
|
|
#define SFRAME_F_FRAME_POINTER 0x2
|
|
|
|
#define SFRAME_CFA_FIXED_FP_INVALID 0
|
|
#define SFRAME_CFA_FIXED_RA_INVALID 0
|
|
|
|
/* Supported ABIs/Arch. */
|
|
#define SFRAME_ABI_AARCH64_ENDIAN_BIG 1 /* AARCH64 big endian. */
|
|
#define SFRAME_ABI_AARCH64_ENDIAN_LITTLE 2 /* AARCH64 little endian. */
|
|
#define SFRAME_ABI_AMD64_ENDIAN_LITTLE 3 /* AMD64 little endian. */
|
|
|
|
/* SFrame FRE types. */
|
|
#define SFRAME_FRE_TYPE_ADDR1 0
|
|
#define SFRAME_FRE_TYPE_ADDR2 1
|
|
#define SFRAME_FRE_TYPE_ADDR4 2
|
|
|
|
/* SFrame Function Descriptor Entry types.
|
|
|
|
The SFrame format has two possible representations for functions. The
|
|
choice of which type to use is made according to the instruction patterns
|
|
in the relevant program stub.
|
|
|
|
An SFrame FDE of type SFRAME_FDE_TYPE_PCINC is an indication
|
|
that the PCs in the FREs should be treated as increments in bytes. This is
|
|
used for a bulk of the executable code of a program, which contains
|
|
instructions with no specific pattern.
|
|
|
|
An SFrame FDE of type SFRAME_FDE_TYPE_PCMASK is an indication
|
|
that the PCs in the FREs should be treated as masks. This type is useful
|
|
for the cases when a small pattern of instructions in a program stub is
|
|
repeatedly to cover a specific functionality. Typical usescases are pltN
|
|
entries, trampolines etc. */
|
|
|
|
/* Unwinders perform a (PC >= FRE_START_ADDR) to look up a matching FRE. */
|
|
#define SFRAME_FDE_TYPE_PCINC 0
|
|
/* Unwinders perform a (PC % REP_BLOCK_SIZE >= FRE_START_ADDR) to look up a
|
|
matching FRE. */
|
|
#define SFRAME_FDE_TYPE_PCMASK 1
|
|
|
|
typedef struct sframe_preamble
|
|
{
|
|
uint16_t sfp_magic; /* Magic number (SFRAME_MAGIC). */
|
|
uint8_t sfp_version; /* Data format version number (SFRAME_VERSION). */
|
|
uint8_t sfp_flags; /* Flags. */
|
|
} ATTRIBUTE_PACKED sframe_preamble;
|
|
|
|
typedef struct sframe_header
|
|
{
|
|
sframe_preamble sfh_preamble;
|
|
/* Information about the arch (endianness) and ABI. */
|
|
uint8_t sfh_abi_arch;
|
|
/* Offset for the Frame Pointer (FP) from CFA may be fixed for some
|
|
ABIs (e.g, in AMD64 when -fno-omit-frame-pointer is used). When fixed,
|
|
this field specifies the fixed stack frame offset and the individual
|
|
FREs do not need to track it. When not fixed, it is set to
|
|
SFRAME_CFA_FIXED_FP_INVALID, and the individual FREs may provide
|
|
the applicable stack frame offset, if any. */
|
|
int8_t sfh_cfa_fixed_fp_offset;
|
|
/* Offset for the Return Address from CFA is fixed for some ABIs
|
|
(e.g., AMD64 has it as CFA-8). When fixed, the header specifies the
|
|
fixed stack frame offset and the individual FREs do not track it. When
|
|
not fixed, it is set to SFRAME_CFA_FIXED_RA_INVALID, and individual
|
|
FREs provide the applicable stack frame offset, if any. */
|
|
int8_t sfh_cfa_fixed_ra_offset;
|
|
/* Number of bytes making up the auxiliary header, if any.
|
|
Some ABI/arch, in the future, may use this space for extending the
|
|
information in SFrame header. Auxiliary header is contained in
|
|
bytes sequentially following the sframe_header. */
|
|
uint8_t sfh_auxhdr_len;
|
|
/* Number of SFrame FDEs in this SFrame section. */
|
|
uint32_t sfh_num_fdes;
|
|
/* Number of SFrame Frame Row Entries. */
|
|
uint32_t sfh_num_fres;
|
|
/* Number of bytes in the SFrame Frame Row Entry section. */
|
|
uint32_t sfh_fre_len;
|
|
/* Offset of SFrame Function Descriptor Entry section. */
|
|
uint32_t sfh_fdeoff;
|
|
/* Offset of SFrame Frame Row Entry section. */
|
|
uint32_t sfh_freoff;
|
|
} ATTRIBUTE_PACKED sframe_header;
|
|
|
|
#define SFRAME_V1_HDR_SIZE(sframe_hdr) \
|
|
((sizeof (sframe_header) + (sframe_hdr).sfh_auxhdr_len))
|
|
|
|
/* Two possible keys for executable (instruction) pointers signing. */
|
|
#define SFRAME_AARCH64_PAUTH_KEY_A 0 /* Key A. */
|
|
#define SFRAME_AARCH64_PAUTH_KEY_B 1 /* Key B. */
|
|
|
|
typedef struct sframe_func_desc_entry
|
|
{
|
|
/* Function start address. Encoded as a signed offset, relative to the
|
|
beginning of the current FDE. */
|
|
int32_t sfde_func_start_address;
|
|
/* Size of the function in bytes. */
|
|
uint32_t sfde_func_size;
|
|
/* Offset of the first SFrame Frame Row Entry of the function, relative to the
|
|
beginning of the SFrame Frame Row Entry sub-section. */
|
|
uint32_t sfde_func_start_fre_off;
|
|
/* Number of frame row entries for the function. */
|
|
uint32_t sfde_func_num_fres;
|
|
/* Additional information for stack tracing from the function:
|
|
- 4-bits: Identify the FRE type used for the function.
|
|
- 1-bit: Identify the FDE type of the function - mask or inc.
|
|
- 1-bit: PAC authorization A/B key (aarch64).
|
|
- 2-bits: Unused.
|
|
------------------------------------------------------------------------
|
|
| Unused | PAC auth A/B key (aarch64) | FDE type | FRE type |
|
|
| | Unused (amd64) | | |
|
|
------------------------------------------------------------------------
|
|
8 6 5 4 0 */
|
|
uint8_t sfde_func_info;
|
|
/* Size of the block of repeating insns. Used for SFrame FDEs of type
|
|
SFRAME_FDE_TYPE_PCMASK. */
|
|
uint8_t sfde_func_rep_size;
|
|
uint16_t sfde_func_padding2;
|
|
} ATTRIBUTE_PACKED sframe_func_desc_entry;
|
|
|
|
/* Macros to compose and decompose function info in FDE. */
|
|
|
|
/* Note: Set PAC auth key to SFRAME_AARCH64_PAUTH_KEY_A by default. */
|
|
#define SFRAME_V1_FUNC_INFO(fde_type, fre_enc_type) \
|
|
(((SFRAME_AARCH64_PAUTH_KEY_A & 0x1) << 5) | \
|
|
(((fde_type) & 0x1) << 4) | ((fre_enc_type) & 0xf))
|
|
|
|
#define SFRAME_V1_FUNC_FRE_TYPE(data) ((data) & 0xf)
|
|
#define SFRAME_V1_FUNC_FDE_TYPE(data) (((data) >> 4) & 0x1)
|
|
#define SFRAME_V1_FUNC_PAUTH_KEY(data) (((data) >> 5) & 0x1)
|
|
|
|
/* Set the pauth key as indicated. */
|
|
#define SFRAME_V1_FUNC_INFO_UPDATE_PAUTH_KEY(pauth_key, fde_info) \
|
|
((((pauth_key) & 0x1) << 5) | ((fde_info) & 0xdf))
|
|
|
|
/* Size of stack frame offsets in an SFrame Frame Row Entry. A single
|
|
SFrame FRE has all offsets of the same size. Offset size may vary
|
|
across frame row entries. */
|
|
#define SFRAME_FRE_OFFSET_1B 0
|
|
#define SFRAME_FRE_OFFSET_2B 1
|
|
#define SFRAME_FRE_OFFSET_4B 2
|
|
|
|
/* An SFrame Frame Row Entry can be SP or FP based. */
|
|
#define SFRAME_BASE_REG_FP 0
|
|
#define SFRAME_BASE_REG_SP 1
|
|
|
|
/* The index at which a specific offset is presented in the variable length
|
|
bytes of an FRE. */
|
|
#define SFRAME_FRE_CFA_OFFSET_IDX 0
|
|
/* The RA stack offset, if present, will always be at index 1 in the variable
|
|
length bytes of the FRE. */
|
|
#define SFRAME_FRE_RA_OFFSET_IDX 1
|
|
/* The FP stack offset may appear at offset 1 or 2, depending on the ABI as RA
|
|
may or may not be tracked. */
|
|
#define SFRAME_FRE_FP_OFFSET_IDX 2
|
|
|
|
typedef struct sframe_fre_info
|
|
{
|
|
/* Information about
|
|
- 1 bit: base reg for CFA
|
|
- 4 bits: Number of offsets (N). A value of upto 3 is allowed to track
|
|
all three of CFA, FP and RA (fixed implicit order).
|
|
- 2 bits: information about size of the offsets (S) in bytes.
|
|
Valid values are SFRAME_FRE_OFFSET_1B, SFRAME_FRE_OFFSET_2B,
|
|
SFRAME_FRE_OFFSET_4B
|
|
- 1 bit: Mangled RA state bit (aarch64 only).
|
|
----------------------------------------------------------------------------------
|
|
| Mangled-RA (aarch64) | Size of offsets | Number of offsets | base_reg |
|
|
| Unused (amd64) | | | |
|
|
----------------------------------------------------------------------------------
|
|
8 7 5 1 0
|
|
|
|
*/
|
|
uint8_t fre_info;
|
|
} sframe_fre_info;
|
|
|
|
/* Macros to compose and decompose FRE info. */
|
|
|
|
/* Note: Set mangled_ra_p to zero by default. */
|
|
#define SFRAME_V1_FRE_INFO(base_reg_id, offset_num, offset_size) \
|
|
(((0 & 0x1) << 7) | (((offset_size) & 0x3) << 5) | \
|
|
(((offset_num) & 0xf) << 1) | ((base_reg_id) & 0x1))
|
|
|
|
/* Set the mangled_ra_p bit as indicated. */
|
|
#define SFRAME_V1_FRE_INFO_UPDATE_MANGLED_RA_P(mangled_ra_p, fre_info) \
|
|
((((mangled_ra_p) & 0x1) << 7) | ((fre_info) & 0x7f))
|
|
|
|
#define SFRAME_V1_FRE_CFA_BASE_REG_ID(data) ((data) & 0x1)
|
|
#define SFRAME_V1_FRE_OFFSET_COUNT(data) (((data) >> 1) & 0xf)
|
|
#define SFRAME_V1_FRE_OFFSET_SIZE(data) (((data) >> 5) & 0x3)
|
|
#define SFRAME_V1_FRE_MANGLED_RA_P(data) (((data) >> 7) & 0x1)
|
|
|
|
/* SFrame Frame Row Entry definitions.
|
|
|
|
Used for both AMD64 and AARCH64.
|
|
|
|
An SFrame Frame Row Entry is a self-sufficient record which contains
|
|
information on how to generate the stack trace for the specified range of
|
|
PCs. Each SFrame Frame Row Entry is followed by S*N bytes, where:
|
|
S is the size of the stack frame offset for the FRE, and
|
|
N is the number of stack frame offsets in the FRE
|
|
|
|
The offsets are interpreted in order as follows:
|
|
|
|
offset1 (interpreted as CFA = BASE_REG + offset1)
|
|
|
|
if RA is being tracked
|
|
offset2 (interpreted as RA = CFA + offset2)
|
|
if FP is being tracked
|
|
offset3 (intrepreted as FP = CFA + offset2)
|
|
fi
|
|
else
|
|
if FP is being tracked
|
|
offset2 (intrepreted as FP = CFA + offset2)
|
|
fi
|
|
fi
|
|
*/
|
|
|
|
/* Used when SFRAME_FRE_TYPE_ADDR1 is specified as FRE type. */
|
|
typedef struct sframe_frame_row_entry_addr1
|
|
{
|
|
/* Start address of the frame row entry. Encoded as an 1-byte unsigned
|
|
offset, relative to the start address of the function. */
|
|
uint8_t sfre_start_address;
|
|
sframe_fre_info sfre_info;
|
|
} ATTRIBUTE_PACKED sframe_frame_row_entry_addr1;
|
|
|
|
/* Upper limit of start address in sframe_frame_row_entry_addr1
|
|
is 0x100 (not inclusive). */
|
|
#define SFRAME_FRE_TYPE_ADDR1_LIMIT \
|
|
(1ULL << ((SFRAME_FRE_TYPE_ADDR1 + 1) * 8))
|
|
|
|
/* Used when SFRAME_FRE_TYPE_ADDR2 is specified as FRE type. */
|
|
typedef struct sframe_frame_row_entry_addr2
|
|
{
|
|
/* Start address of the frame row entry. Encoded as an 2-byte unsigned
|
|
offset, relative to the start address of the function. */
|
|
uint16_t sfre_start_address;
|
|
sframe_fre_info sfre_info;
|
|
} ATTRIBUTE_PACKED sframe_frame_row_entry_addr2;
|
|
|
|
/* Upper limit of start address in sframe_frame_row_entry_addr2
|
|
is 0x10000 (not inclusive). */
|
|
#define SFRAME_FRE_TYPE_ADDR2_LIMIT \
|
|
(1ULL << ((SFRAME_FRE_TYPE_ADDR2 * 2) * 8))
|
|
|
|
/* Used when SFRAME_FRE_TYPE_ADDR4 is specified as FRE type. */
|
|
typedef struct sframe_frame_row_entry_addr4
|
|
{
|
|
/* Start address of the frame row entry. Encoded as a 4-byte unsigned
|
|
offset, relative to the start address of the function. */
|
|
uint32_t sfre_start_address;
|
|
sframe_fre_info sfre_info;
|
|
} ATTRIBUTE_PACKED sframe_frame_row_entry_addr4;
|
|
|
|
/* Upper limit of start address in sframe_frame_row_entry_addr2
|
|
is 0x100000000 (not inclusive). */
|
|
#define SFRAME_FRE_TYPE_ADDR4_LIMIT \
|
|
(1ULL << ((SFRAME_FRE_TYPE_ADDR4 * 2) * 8))
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _SFRAME_H */
|