| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
|---|
| 2 | /* |
|---|
| 3 | * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com> |
|---|
| 4 | */ |
|---|
| 5 | |
|---|
| 6 | #ifndef _ORC_TYPES_H |
|---|
| 7 | #define _ORC_TYPES_H |
|---|
| 8 | |
|---|
| 9 | #include <linux/types.h> |
|---|
| 10 | #include <linux/compiler.h> |
|---|
| 11 | |
|---|
| 12 | /* |
|---|
| 13 | * The ORC_REG_* registers are base registers which are used to find other |
|---|
| 14 | * registers on the stack. |
|---|
| 15 | * |
|---|
| 16 | * ORC_REG_PREV_SP, also known as DWARF Call Frame Address (CFA), is the |
|---|
| 17 | * address of the previous frame: the caller's SP before it called the current |
|---|
| 18 | * function. |
|---|
| 19 | * |
|---|
| 20 | * ORC_REG_UNDEFINED means the corresponding register's value didn't change in |
|---|
| 21 | * the current frame. |
|---|
| 22 | * |
|---|
| 23 | * The most commonly used base registers are SP and BP -- which the previous SP |
|---|
| 24 | * is usually based on -- and PREV_SP and UNDEFINED -- which the previous BP is |
|---|
| 25 | * usually based on. |
|---|
| 26 | * |
|---|
| 27 | * The rest of the base registers are needed for special cases like entry code |
|---|
| 28 | * and GCC realigned stacks. |
|---|
| 29 | */ |
|---|
| 30 | #define ORC_REG_UNDEFINED 0 |
|---|
| 31 | #define ORC_REG_PREV_SP 1 |
|---|
| 32 | #define ORC_REG_DX 2 |
|---|
| 33 | #define ORC_REG_DI 3 |
|---|
| 34 | #define ORC_REG_BP 4 |
|---|
| 35 | #define ORC_REG_SP 5 |
|---|
| 36 | #define ORC_REG_R10 6 |
|---|
| 37 | #define ORC_REG_R13 7 |
|---|
| 38 | #define ORC_REG_BP_INDIRECT 8 |
|---|
| 39 | #define ORC_REG_SP_INDIRECT 9 |
|---|
| 40 | #define ORC_REG_MAX 15 |
|---|
| 41 | |
|---|
| 42 | #ifndef __ASSEMBLY__ |
|---|
| 43 | #include <asm/byteorder.h> |
|---|
| 44 | |
|---|
| 45 | /* |
|---|
| 46 | * This struct is more or less a vastly simplified version of the DWARF Call |
|---|
| 47 | * Frame Information standard. It contains only the necessary parts of DWARF |
|---|
| 48 | * CFI, simplified for ease of access by the in-kernel unwinder. It tells the |
|---|
| 49 | * unwinder how to find the previous SP and BP (and sometimes entry regs) on |
|---|
| 50 | * the stack for a given code address. Each instance of the struct corresponds |
|---|
| 51 | * to one or more code locations. |
|---|
| 52 | */ |
|---|
| 53 | struct orc_entry { |
|---|
| 54 | s16 sp_offset; |
|---|
| 55 | s16 bp_offset; |
|---|
| 56 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
|---|
| 57 | unsigned sp_reg:4; |
|---|
| 58 | unsigned bp_reg:4; |
|---|
| 59 | unsigned type:2; |
|---|
| 60 | unsigned signal:1; |
|---|
| 61 | unsigned end:1; |
|---|
| 62 | #elif defined(__BIG_ENDIAN_BITFIELD) |
|---|
| 63 | unsigned bp_reg:4; |
|---|
| 64 | unsigned sp_reg:4; |
|---|
| 65 | unsigned unused:4; |
|---|
| 66 | unsigned end:1; |
|---|
| 67 | unsigned signal:1; |
|---|
| 68 | unsigned type:2; |
|---|
| 69 | #endif |
|---|
| 70 | } __packed; |
|---|
| 71 | |
|---|
| 72 | #endif /* __ASSEMBLY__ */ |
|---|
| 73 | |
|---|
| 74 | #endif /* _ORC_TYPES_H */ |
|---|
| 75 | |
|---|
