| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* |
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| 3 | * Copyright 2014, Michael Ellerman, IBM Corp. |
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| 4 | */ |
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| 5 | |
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| 6 | #include <ppc-asm.h> |
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| 7 | #include "reg.h" |
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| 8 | |
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| 9 | |
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| 10 | /* ppc-asm.h defines most of the reg aliases, but not r1/r2. */ |
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| 11 | #define r1 1 |
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| 12 | #define r2 2 |
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| 13 | |
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| 14 | #define RFEBB .long 0x4c000924 |
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| 15 | |
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| 16 | /* Stack layout: |
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| 17 | * |
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| 18 | * ^ |
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| 19 | * User stack | |
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| 20 | * Back chain ------+ <- r1 <-------+ |
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| 21 | * ... | |
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| 22 | * Red zone / ABI Gap | |
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| 23 | * ... | |
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| 24 | * vr63 <+ | |
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| 25 | * vr0 | | |
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| 26 | * VSCR | | |
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| 27 | * FSCR | | |
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| 28 | * r31 | Save area | |
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| 29 | * r0 | | |
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| 30 | * XER | | |
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| 31 | * CTR | | |
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| 32 | * LR | | |
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| 33 | * CCR <+ | |
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| 34 | * ... <+ | |
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| 35 | * LR | Caller frame | |
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| 36 | * CCR | | |
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| 37 | * Back chain <+ <- updated r1 --------+ |
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| 38 | * |
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| 39 | */ |
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| 40 | |
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| 41 | #if defined(_CALL_ELF) && _CALL_ELF == 2 |
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| 42 | #define ABIGAP 512 |
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| 43 | #else |
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| 44 | #define ABIGAP 288 |
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| 45 | #endif |
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| 46 | |
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| 47 | #define NR_GPR 32 |
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| 48 | #define NR_SPR 6 |
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| 49 | #define NR_VSR 64 |
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| 50 | |
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| 51 | #define SAVE_AREA ((NR_GPR + NR_SPR) * 8 + (NR_VSR * 16)) |
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| 52 | #define CALLER_FRAME 112 |
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| 53 | |
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| 54 | #define STACK_FRAME (ABIGAP + SAVE_AREA + CALLER_FRAME) |
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| 55 | |
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| 56 | #define CCR_SAVE (CALLER_FRAME) |
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| 57 | #define LR_SAVE (CCR_SAVE + 8) |
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| 58 | #define CTR_SAVE (LR_SAVE + 8) |
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| 59 | #define XER_SAVE (CTR_SAVE + 8) |
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| 60 | #define GPR_SAVE(n) (XER_SAVE + 8 + (8 * n)) |
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| 61 | #define FSCR_SAVE (GPR_SAVE(31) + 8) |
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| 62 | #define VSCR_SAVE (FSCR_SAVE + 8) |
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| 63 | #define VSR_SAVE(n) (VSCR_SAVE + 8 + (16 * n)) |
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| 64 | |
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| 65 | #define SAVE_GPR(n) std n,GPR_SAVE(n)(r1) |
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| 66 | #define REST_GPR(n) ld n,GPR_SAVE(n)(r1) |
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| 67 | #define TRASH_GPR(n) lis n,0xaaaa |
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| 68 | |
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| 69 | #define SAVE_VSR(n, b) li b, VSR_SAVE(n); stxvd2x n,b,r1 |
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| 70 | #define LOAD_VSR(n, b) li b, VSR_SAVE(n); lxvd2x n,b,r1 |
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| 71 | |
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| 72 | #define LOAD_REG_IMMEDIATE(reg,expr) \ |
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| 73 | lis reg,(expr)@highest; \ |
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| 74 | ori reg,reg,(expr)@higher; \ |
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| 75 | rldicr reg,reg,32,31; \ |
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| 76 | oris reg,reg,(expr)@h; \ |
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| 77 | ori reg,reg,(expr)@l; |
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| 78 | |
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| 79 | |
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| 80 | #if defined(_CALL_ELF) && _CALL_ELF == 2 |
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| 81 | #define ENTRY_POINT(name) \ |
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| 82 | .type FUNC_NAME(name),@function; \ |
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| 83 | .globl FUNC_NAME(name); \ |
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| 84 | FUNC_NAME(name): |
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| 85 | |
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| 86 | #define RESTORE_TOC(name) \ |
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| 87 | /* Restore our TOC pointer using our entry point */ \ |
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| 88 | LOAD_REG_IMMEDIATE(r12, name) \ |
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| 89 | 0: addis r2,r12,(.TOC.-0b)@ha; \ |
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| 90 | addi r2,r2,(.TOC.-0b)@l; |
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| 91 | |
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| 92 | #else |
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| 93 | #define ENTRY_POINT(name) FUNC_START(name) |
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| 94 | #define RESTORE_TOC(name) \ |
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| 95 | /* Restore our TOC pointer via our opd entry */ \ |
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| 96 | LOAD_REG_IMMEDIATE(r2, name) \ |
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| 97 | ld r2,8(r2); |
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| 98 | #endif |
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| 99 | |
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| 100 | .text |
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| 101 | |
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| 102 | ENTRY_POINT(ebb_handler) |
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| 103 | stdu r1,-STACK_FRAME(r1) |
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| 104 | SAVE_GPR(0) |
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| 105 | mflr r0 |
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| 106 | std r0,LR_SAVE(r1) |
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| 107 | mfcr r0 |
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| 108 | std r0,CCR_SAVE(r1) |
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| 109 | mfctr r0 |
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| 110 | std r0,CTR_SAVE(r1) |
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| 111 | mfxer r0 |
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| 112 | std r0,XER_SAVE(r1) |
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| 113 | SAVE_GPR(2) |
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| 114 | SAVE_GPR(3) |
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| 115 | SAVE_GPR(4) |
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| 116 | SAVE_GPR(5) |
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| 117 | SAVE_GPR(6) |
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| 118 | SAVE_GPR(7) |
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| 119 | SAVE_GPR(8) |
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| 120 | SAVE_GPR(9) |
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| 121 | SAVE_GPR(10) |
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| 122 | SAVE_GPR(11) |
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| 123 | SAVE_GPR(12) |
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| 124 | SAVE_GPR(13) |
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| 125 | SAVE_GPR(14) |
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| 126 | SAVE_GPR(15) |
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| 127 | SAVE_GPR(16) |
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| 128 | SAVE_GPR(17) |
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| 129 | SAVE_GPR(18) |
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| 130 | SAVE_GPR(19) |
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| 131 | SAVE_GPR(20) |
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| 132 | SAVE_GPR(21) |
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| 133 | SAVE_GPR(22) |
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| 134 | SAVE_GPR(23) |
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| 135 | SAVE_GPR(24) |
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| 136 | SAVE_GPR(25) |
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| 137 | SAVE_GPR(26) |
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| 138 | SAVE_GPR(27) |
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| 139 | SAVE_GPR(28) |
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| 140 | SAVE_GPR(29) |
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| 141 | SAVE_GPR(30) |
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| 142 | SAVE_GPR(31) |
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| 143 | SAVE_VSR(0, r3) |
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| 144 | mffs f0 |
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| 145 | stfd f0, FSCR_SAVE(r1) |
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| 146 | mfvscr f0 |
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| 147 | stfd f0, VSCR_SAVE(r1) |
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| 148 | SAVE_VSR(1, r3) |
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| 149 | SAVE_VSR(2, r3) |
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| 150 | SAVE_VSR(3, r3) |
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| 151 | SAVE_VSR(4, r3) |
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| 152 | SAVE_VSR(5, r3) |
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| 153 | SAVE_VSR(6, r3) |
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| 154 | SAVE_VSR(7, r3) |
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| 155 | SAVE_VSR(8, r3) |
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| 156 | SAVE_VSR(9, r3) |
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| 157 | SAVE_VSR(10, r3) |
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| 158 | SAVE_VSR(11, r3) |
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| 159 | SAVE_VSR(12, r3) |
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| 160 | SAVE_VSR(13, r3) |
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| 161 | SAVE_VSR(14, r3) |
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| 162 | SAVE_VSR(15, r3) |
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| 163 | SAVE_VSR(16, r3) |
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| 164 | SAVE_VSR(17, r3) |
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| 165 | SAVE_VSR(18, r3) |
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| 166 | SAVE_VSR(19, r3) |
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| 167 | SAVE_VSR(20, r3) |
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| 168 | SAVE_VSR(21, r3) |
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| 169 | SAVE_VSR(22, r3) |
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| 170 | SAVE_VSR(23, r3) |
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| 171 | SAVE_VSR(24, r3) |
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| 172 | SAVE_VSR(25, r3) |
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| 173 | SAVE_VSR(26, r3) |
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| 174 | SAVE_VSR(27, r3) |
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| 175 | SAVE_VSR(28, r3) |
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| 176 | SAVE_VSR(29, r3) |
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| 177 | SAVE_VSR(30, r3) |
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| 178 | SAVE_VSR(31, r3) |
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| 179 | SAVE_VSR(32, r3) |
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| 180 | SAVE_VSR(33, r3) |
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| 181 | SAVE_VSR(34, r3) |
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| 182 | SAVE_VSR(35, r3) |
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| 183 | SAVE_VSR(36, r3) |
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| 184 | SAVE_VSR(37, r3) |
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| 185 | SAVE_VSR(38, r3) |
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| 186 | SAVE_VSR(39, r3) |
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| 187 | SAVE_VSR(40, r3) |
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| 188 | SAVE_VSR(41, r3) |
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| 189 | SAVE_VSR(42, r3) |
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| 190 | SAVE_VSR(43, r3) |
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| 191 | SAVE_VSR(44, r3) |
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| 192 | SAVE_VSR(45, r3) |
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| 193 | SAVE_VSR(46, r3) |
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| 194 | SAVE_VSR(47, r3) |
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| 195 | SAVE_VSR(48, r3) |
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| 196 | SAVE_VSR(49, r3) |
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| 197 | SAVE_VSR(50, r3) |
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| 198 | SAVE_VSR(51, r3) |
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| 199 | SAVE_VSR(52, r3) |
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| 200 | SAVE_VSR(53, r3) |
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| 201 | SAVE_VSR(54, r3) |
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| 202 | SAVE_VSR(55, r3) |
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| 203 | SAVE_VSR(56, r3) |
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| 204 | SAVE_VSR(57, r3) |
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| 205 | SAVE_VSR(58, r3) |
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| 206 | SAVE_VSR(59, r3) |
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| 207 | SAVE_VSR(60, r3) |
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| 208 | SAVE_VSR(61, r3) |
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| 209 | SAVE_VSR(62, r3) |
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| 210 | SAVE_VSR(63, r3) |
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| 211 | |
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| 212 | TRASH_GPR(2) |
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| 213 | TRASH_GPR(3) |
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| 214 | TRASH_GPR(4) |
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| 215 | TRASH_GPR(5) |
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| 216 | TRASH_GPR(6) |
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| 217 | TRASH_GPR(7) |
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| 218 | TRASH_GPR(8) |
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| 219 | TRASH_GPR(9) |
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| 220 | TRASH_GPR(10) |
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| 221 | TRASH_GPR(11) |
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| 222 | TRASH_GPR(12) |
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| 223 | TRASH_GPR(14) |
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| 224 | TRASH_GPR(15) |
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| 225 | TRASH_GPR(16) |
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| 226 | TRASH_GPR(17) |
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| 227 | TRASH_GPR(18) |
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| 228 | TRASH_GPR(19) |
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| 229 | TRASH_GPR(20) |
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| 230 | TRASH_GPR(21) |
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| 231 | TRASH_GPR(22) |
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| 232 | TRASH_GPR(23) |
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| 233 | TRASH_GPR(24) |
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| 234 | TRASH_GPR(25) |
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| 235 | TRASH_GPR(26) |
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| 236 | TRASH_GPR(27) |
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| 237 | TRASH_GPR(28) |
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| 238 | TRASH_GPR(29) |
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| 239 | TRASH_GPR(30) |
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| 240 | TRASH_GPR(31) |
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| 241 | |
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| 242 | RESTORE_TOC(ebb_handler) |
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| 243 | |
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| 244 | /* |
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| 245 | * r13 is our TLS pointer. We leave whatever value was in there when the |
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| 246 | * EBB fired. That seems to be OK because once set the TLS pointer is not |
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| 247 | * changed - but presumably that could change in future. |
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| 248 | */ |
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| 249 | |
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| 250 | bl ebb_hook |
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| 251 | nop |
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| 252 | |
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| 253 | /* r2 may be changed here but we don't care */ |
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| 254 | |
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| 255 | lfd f0, FSCR_SAVE(r1) |
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| 256 | mtfsf 0xff,f0 |
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| 257 | lfd f0, VSCR_SAVE(r1) |
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| 258 | mtvscr f0 |
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| 259 | LOAD_VSR(0, r3) |
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| 260 | LOAD_VSR(1, r3) |
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| 261 | LOAD_VSR(2, r3) |
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| 262 | LOAD_VSR(3, r3) |
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| 263 | LOAD_VSR(4, r3) |
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| 264 | LOAD_VSR(5, r3) |
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| 265 | LOAD_VSR(6, r3) |
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| 266 | LOAD_VSR(7, r3) |
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| 267 | LOAD_VSR(8, r3) |
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| 268 | LOAD_VSR(9, r3) |
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| 269 | LOAD_VSR(10, r3) |
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| 270 | LOAD_VSR(11, r3) |
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| 271 | LOAD_VSR(12, r3) |
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| 272 | LOAD_VSR(13, r3) |
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| 273 | LOAD_VSR(14, r3) |
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| 274 | LOAD_VSR(15, r3) |
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| 275 | LOAD_VSR(16, r3) |
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| 276 | LOAD_VSR(17, r3) |
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| 277 | LOAD_VSR(18, r3) |
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| 278 | LOAD_VSR(19, r3) |
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| 279 | LOAD_VSR(20, r3) |
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| 280 | LOAD_VSR(21, r3) |
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| 281 | LOAD_VSR(22, r3) |
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| 282 | LOAD_VSR(23, r3) |
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| 283 | LOAD_VSR(24, r3) |
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| 284 | LOAD_VSR(25, r3) |
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| 285 | LOAD_VSR(26, r3) |
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| 286 | LOAD_VSR(27, r3) |
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| 287 | LOAD_VSR(28, r3) |
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| 288 | LOAD_VSR(29, r3) |
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| 289 | LOAD_VSR(30, r3) |
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| 290 | LOAD_VSR(31, r3) |
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| 291 | LOAD_VSR(32, r3) |
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| 292 | LOAD_VSR(33, r3) |
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| 293 | LOAD_VSR(34, r3) |
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| 294 | LOAD_VSR(35, r3) |
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| 295 | LOAD_VSR(36, r3) |
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| 296 | LOAD_VSR(37, r3) |
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| 297 | LOAD_VSR(38, r3) |
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| 298 | LOAD_VSR(39, r3) |
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| 299 | LOAD_VSR(40, r3) |
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| 300 | LOAD_VSR(41, r3) |
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| 301 | LOAD_VSR(42, r3) |
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| 302 | LOAD_VSR(43, r3) |
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| 303 | LOAD_VSR(44, r3) |
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| 304 | LOAD_VSR(45, r3) |
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| 305 | LOAD_VSR(46, r3) |
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| 306 | LOAD_VSR(47, r3) |
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| 307 | LOAD_VSR(48, r3) |
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| 308 | LOAD_VSR(49, r3) |
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| 309 | LOAD_VSR(50, r3) |
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| 310 | LOAD_VSR(51, r3) |
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| 311 | LOAD_VSR(52, r3) |
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| 312 | LOAD_VSR(53, r3) |
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| 313 | LOAD_VSR(54, r3) |
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| 314 | LOAD_VSR(55, r3) |
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| 315 | LOAD_VSR(56, r3) |
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| 316 | LOAD_VSR(57, r3) |
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| 317 | LOAD_VSR(58, r3) |
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| 318 | LOAD_VSR(59, r3) |
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| 319 | LOAD_VSR(60, r3) |
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| 320 | LOAD_VSR(61, r3) |
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| 321 | LOAD_VSR(62, r3) |
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| 322 | LOAD_VSR(63, r3) |
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| 323 | |
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| 324 | ld r0,XER_SAVE(r1) |
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| 325 | mtxer r0 |
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| 326 | ld r0,CTR_SAVE(r1) |
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| 327 | mtctr r0 |
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| 328 | ld r0,LR_SAVE(r1) |
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| 329 | mtlr r0 |
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| 330 | ld r0,CCR_SAVE(r1) |
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| 331 | mtcr r0 |
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| 332 | REST_GPR(0) |
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| 333 | REST_GPR(2) |
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| 334 | REST_GPR(3) |
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| 335 | REST_GPR(4) |
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| 336 | REST_GPR(5) |
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| 337 | REST_GPR(6) |
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| 338 | REST_GPR(7) |
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| 339 | REST_GPR(8) |
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| 340 | REST_GPR(9) |
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| 341 | REST_GPR(10) |
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| 342 | REST_GPR(11) |
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| 343 | REST_GPR(12) |
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| 344 | REST_GPR(13) |
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| 345 | REST_GPR(14) |
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| 346 | REST_GPR(15) |
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| 347 | REST_GPR(16) |
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| 348 | REST_GPR(17) |
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| 349 | REST_GPR(18) |
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| 350 | REST_GPR(19) |
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| 351 | REST_GPR(20) |
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| 352 | REST_GPR(21) |
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| 353 | REST_GPR(22) |
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| 354 | REST_GPR(23) |
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| 355 | REST_GPR(24) |
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| 356 | REST_GPR(25) |
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| 357 | REST_GPR(26) |
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| 358 | REST_GPR(27) |
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| 359 | REST_GPR(28) |
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| 360 | REST_GPR(29) |
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| 361 | REST_GPR(30) |
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| 362 | REST_GPR(31) |
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| 363 | addi r1,r1,STACK_FRAME |
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| 364 | RFEBB |
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| 365 | FUNC_END(ebb_handler) |
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| 366 | |
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