| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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| 2 | /* |
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| 3 | * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com> |
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| 4 | */ |
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| 5 | |
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| 6 | #ifndef _ORC_TYPES_H |
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| 7 | #define _ORC_TYPES_H |
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| 8 | |
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| 9 | #include <linux/types.h> |
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| 10 | #include <linux/compiler.h> |
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| 11 | |
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| 12 | /* |
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| 13 | * The ORC_REG_* registers are base registers which are used to find other |
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| 14 | * registers on the stack. |
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| 15 | * |
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| 16 | * ORC_REG_PREV_SP, also known as DWARF Call Frame Address (CFA), is the |
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| 17 | * address of the previous frame: the caller's SP before it called the current |
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| 18 | * function. |
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| 19 | * |
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| 20 | * ORC_REG_UNDEFINED means the corresponding register's value didn't change in |
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| 21 | * the current frame. |
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| 22 | * |
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| 23 | * The most commonly used base registers are SP and BP -- which the previous SP |
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| 24 | * is usually based on -- and PREV_SP and UNDEFINED -- which the previous BP is |
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| 25 | * usually based on. |
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| 26 | * |
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| 27 | * The rest of the base registers are needed for special cases like entry code |
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| 28 | * and GCC realigned stacks. |
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| 29 | */ |
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| 30 | #define ORC_REG_UNDEFINED 0 |
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| 31 | #define ORC_REG_PREV_SP 1 |
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| 32 | #define ORC_REG_DX 2 |
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| 33 | #define ORC_REG_DI 3 |
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| 34 | #define ORC_REG_BP 4 |
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| 35 | #define ORC_REG_SP 5 |
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| 36 | #define ORC_REG_R10 6 |
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| 37 | #define ORC_REG_R13 7 |
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| 38 | #define ORC_REG_BP_INDIRECT 8 |
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| 39 | #define ORC_REG_SP_INDIRECT 9 |
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| 40 | #define ORC_REG_MAX 15 |
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| 41 | |
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| 42 | #define ORC_TYPE_UNDEFINED 0 |
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| 43 | #define ORC_TYPE_END_OF_STACK 1 |
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| 44 | #define ORC_TYPE_CALL 2 |
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| 45 | #define ORC_TYPE_REGS 3 |
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| 46 | #define ORC_TYPE_REGS_PARTIAL 4 |
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| 47 | |
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| 48 | #ifndef __ASSEMBLER__ |
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| 49 | #include <asm/byteorder.h> |
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| 50 | |
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| 51 | /* |
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| 52 | * This struct is more or less a vastly simplified version of the DWARF Call |
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| 53 | * Frame Information standard. It contains only the necessary parts of DWARF |
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| 54 | * CFI, simplified for ease of access by the in-kernel unwinder. It tells the |
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| 55 | * unwinder how to find the previous SP and BP (and sometimes entry regs) on |
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| 56 | * the stack for a given code address. Each instance of the struct corresponds |
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| 57 | * to one or more code locations. |
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| 58 | */ |
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| 59 | struct orc_entry { |
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| 60 | s16 sp_offset; |
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| 61 | s16 bp_offset; |
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| 62 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
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| 63 | unsigned sp_reg:4; |
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| 64 | unsigned bp_reg:4; |
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| 65 | unsigned type:3; |
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| 66 | unsigned signal:1; |
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| 67 | #elif defined(__BIG_ENDIAN_BITFIELD) |
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| 68 | unsigned bp_reg:4; |
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| 69 | unsigned sp_reg:4; |
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| 70 | unsigned unused:4; |
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| 71 | unsigned signal:1; |
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| 72 | unsigned type:3; |
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| 73 | #endif |
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| 74 | } __packed; |
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| 75 | |
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| 76 | #endif /* __ASSEMBLER__ */ |
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| 77 | |
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| 78 | #endif /* _ORC_TYPES_H */ |
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| 79 | |
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