/* * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com> * * This program 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 2 * of the License, 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; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _ORC_TYPES_H #define _ORC_TYPES_H #include <linux/types.h> #include <linux/compiler.h> /* * The ORC_REG_* registers are base registers which are used to find other * registers on the stack. * * ORC_REG_PREV_SP, also known as DWARF Call Frame Address (CFA), is the * address of the previous frame: the caller's SP before it called the current * function. * * ORC_REG_UNDEFINED means the corresponding register's value didn't change in * the current frame. * * The most commonly used base registers are SP and BP -- which the previous SP * is usually based on -- and PREV_SP and UNDEFINED -- which the previous BP is * usually based on. * * The rest of the base registers are needed for special cases like entry code * and GCC realigned stacks. */ #define ORC_REG_UNDEFINED 0 #define ORC_REG_PREV_SP 1 #define ORC_REG_DX 2 #define ORC_REG_DI 3 #define ORC_REG_BP 4 #define ORC_REG_SP 5 #define ORC_REG_R10 6 #define ORC_REG_R13 7 #define ORC_REG_BP_INDIRECT 8 #define ORC_REG_SP_INDIRECT 9 #define ORC_REG_MAX 15 /* * ORC_TYPE_CALL: Indicates that sp_reg+sp_offset resolves to PREV_SP (the * caller's SP right before it made the call). Used for all callable * functions, i.e. all C code and all callable asm functions. * * ORC_TYPE_REGS: Used in entry code to indicate that sp_reg+sp_offset points * to a fully populated pt_regs from a syscall, interrupt, or exception. * * ORC_TYPE_REGS_IRET: Used in entry code to indicate that sp_reg+sp_offset * points to the iret return frame. * * The UNWIND_HINT macros are used only for the unwind_hint struct. They * aren't used in struct orc_entry due to size and complexity constraints. * Objtool converts them to real types when it converts the hints to orc * entries. */ #define ORC_TYPE_CALL 0 #define ORC_TYPE_REGS 1 #define ORC_TYPE_REGS_IRET 2 #define UNWIND_HINT_TYPE_SAVE 3 #define UNWIND_HINT_TYPE_RESTORE 4 #ifndef __ASSEMBLY__ /* * This struct is more or less a vastly simplified version of the DWARF Call * Frame Information standard. It contains only the necessary parts of DWARF * CFI, simplified for ease of access by the in-kernel unwinder. It tells the * unwinder how to find the previous SP and BP (and sometimes entry regs) on * the stack for a given code address. Each instance of the struct corresponds * to one or more code locations. */ struct orc_entry { s16 sp_offset; s16 bp_offset; unsigned sp_reg:4; unsigned bp_reg:4; unsigned type:2; } __packed; /* * This struct is used by asm and inline asm code to manually annotate the * location of registers on the stack for the ORC unwinder. * * Type can be either ORC_TYPE_* or UNWIND_HINT_TYPE_*. */ struct unwind_hint { u32 ip; s16 sp_offset; u8 sp_reg; u8 type; }; #endif /* __ASSEMBLY__ */ #endif /* _ORC_TYPES_H */Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Josh Poimboeuf | 134 | 100.00% | 2 | 100.00% |
| Total | 134 | 100.00% | 2 | 100.00% |