1/* 2 * (C) Copyright 2000-2002 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8/* 9 * This file contains all the macros and symbols which define 10 * a PowerPC assembly language environment. 11 */ 12#ifndef __PPC_ASM_TMPL__ 13#define __PPC_ASM_TMPL__ 14 15#include <config.h> 16 17/*************************************************************************** 18 * 19 * These definitions simplify the ugly declarations necessary for GOT 20 * definitions. 21 * 22 * Stolen from prepboot/bootldr.h, (C) 1998 Gabriel Paubert, paubert@iram.es 23 * 24 * Uses r12 to access the GOT 25 */ 26 27#define START_GOT \ 28 .section ".got2","aw"; \ 29.LCTOC1 = .+32768 30 31#define END_GOT \ 32 .text 33 34#define GET_GOT \ 35 bl 1f ; \ 36 .text 2 ; \ 370: .long .LCTOC1-1f ; \ 38 .text ; \ 391: mflr r12 ; \ 40 lwz r0,0b-1b(r12) ; \ 41 add r12,r0,r12 ; 42 43#define GOT_ENTRY(NAME) .L_ ## NAME = . - .LCTOC1 ; .long NAME 44 45#define GOT(NAME) .L_ ## NAME (r12) 46 47 48/*************************************************************************** 49 * Register names 50 */ 51#define r0 0 52#define r1 1 53#define r2 2 54#define r3 3 55#define r4 4 56#define r5 5 57#define r6 6 58#define r7 7 59#define r8 8 60#define r9 9 61#define r10 10 62#define r11 11 63#define r12 12 64#define r13 13 65#define r14 14 66#define r15 15 67#define r16 16 68#define r17 17 69#define r18 18 70#define r19 19 71#define r20 20 72#define r21 21 73#define r22 22 74#define r23 23 75#define r24 24 76#define r25 25 77#define r26 26 78#define r27 27 79#define r28 28 80#define r29 29 81#define r30 30 82#define r31 31 83 84#define curptr r2 85 86#define SYNC \ 87 sync; \ 88 isync 89 90/* 91 * Macros for storing registers into and loading registers from 92 * exception frames. 93 */ 94#define SAVE_GPR(n, base) stw n,GPR0+4*(n)(base) 95#define SAVE_2GPRS(n, base) SAVE_GPR(n, base); SAVE_GPR(n+1, base) 96#define SAVE_4GPRS(n, base) SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base) 97#define SAVE_8GPRS(n, base) SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base) 98#define SAVE_10GPRS(n, base) SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base) 99#define REST_GPR(n, base) lwz n,GPR0+4*(n)(base) 100#define REST_2GPRS(n, base) REST_GPR(n, base); REST_GPR(n+1, base) 101#define REST_4GPRS(n, base) REST_2GPRS(n, base); REST_2GPRS(n+2, base) 102#define REST_8GPRS(n, base) REST_4GPRS(n, base); REST_4GPRS(n+4, base) 103#define REST_10GPRS(n, base) REST_8GPRS(n, base); REST_2GPRS(n+8, base) 104 105/* 106 * GCC sometimes accesses words at negative offsets from the stack 107 * pointer, although the SysV ABI says it shouldn't. To cope with 108 * this, we leave this much untouched space on the stack on exception 109 * entry. 110 */ 111#define STACK_UNDERHEAD 64 112 113/* 114 * Exception entry code. This code runs with address translation 115 * turned off, i.e. using physical addresses. 116 * We assume sprg3 has the physical address of the current 117 * task's thread_struct. 118 */ 119#define EXCEPTION_PROLOG(reg1, reg2) \ 120 mtspr SPRG0,r20; \ 121 mtspr SPRG1,r21; \ 122 mfcr r20; \ 123 subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\ 124 stw r20,_CCR(r21); /* save registers */ \ 125 stw r22,GPR22(r21); \ 126 stw r23,GPR23(r21); \ 127 mfspr r20,SPRG0; \ 128 stw r20,GPR20(r21); \ 129 mfspr r22,SPRG1; \ 130 stw r22,GPR21(r21); \ 131 mflr r20; \ 132 stw r20,_LINK(r21); \ 133 mfctr r22; \ 134 stw r22,_CTR(r21); \ 135 mfspr r20,XER; \ 136 stw r20,_XER(r21); \ 137 mfspr r20, DAR_DEAR; \ 138 stw r20,_DAR(r21); \ 139 mfspr r22,reg1; \ 140 mfspr r23,reg2; \ 141 stw r0,GPR0(r21); \ 142 stw r1,GPR1(r21); \ 143 stw r2,GPR2(r21); \ 144 stw r1,0(r21); \ 145 mr r1,r21; /* set new kernel sp */ \ 146 SAVE_4GPRS(3, r21); 147/* 148 * Note: code which follows this uses cr0.eq (set if from kernel), 149 * r21, r22 (SRR0), and r23 (SRR1). 150 */ 151 152/* 153 * Exception vectors. 154 * 155 * The data words for `hdlr' and `int_return' are initialized with 156 * OFFSET values only; they must be relocated first before they can 157 * be used! 158 */ 159#define COPY_EE(d, s) rlwimi d,s,0,16,16 160#define NOCOPY(d, s) 161 162#ifdef CONFIG_E500 163#define EXC_XFER_TEMPLATE(n, label, hdlr, msr, copyee) \ 164 stw r22,_NIP(r21); \ 165 stw r23,_MSR(r21); \ 166 li r23,n; \ 167 stw r23,TRAP(r21); \ 168 li r20,msr; \ 169 copyee(r20,r23); \ 170 rlwimi r20,r23,0,25,25; \ 171 mtmsr r20; \ 172 bl 1f; \ 1731: mflr r23; \ 174 addis r23,r23,(hdlr - 1b)@ha; \ 175 addi r23,r23,(hdlr - 1b)@l; \ 176 b transfer_to_handler 177 178#define STD_EXCEPTION(n, label, hdlr) \ 179.align 4; \ 180label: \ 181 EXCEPTION_PROLOG(SRR0, SRR1); \ 182 addi r3,r1,STACK_FRAME_OVERHEAD; \ 183 EXC_XFER_TEMPLATE(n, label, hdlr, MSR_KERNEL, NOCOPY) \ 184 185#define CRIT_EXCEPTION(n, label, hdlr) \ 186.align 4; \ 187label: \ 188 EXCEPTION_PROLOG(CSRR0, CSRR1); \ 189 addi r3,r1,STACK_FRAME_OVERHEAD; \ 190 EXC_XFER_TEMPLATE(n, label, hdlr, \ 191 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ 192 193#define MCK_EXCEPTION(n, label, hdlr) \ 194.align 4; \ 195label: \ 196 EXCEPTION_PROLOG(MCSRR0, MCSRR1); \ 197 addi r3,r1,STACK_FRAME_OVERHEAD; \ 198 EXC_XFER_TEMPLATE(n, label, hdlr, \ 199 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ 200 201#else /* !E500 */ 202 203#define EXC_XFER_TEMPLATE(label, hdlr, msr, copyee) \ 204 bl 1f; \ 2051: mflr r20; \ 206 lwz r20,(.L_ ## label)-1b+8(r20); \ 207 mtlr r20; \ 208 li r20,msr; \ 209 copyee(r20,r23); \ 210 rlwimi r20,r23,0,25,25; \ 211 blrl; \ 212.L_ ## label : \ 213 .long hdlr - _start + _START_OFFSET; \ 214 .long int_return - _start + _START_OFFSET; \ 215 .long transfer_to_handler - _start + _START_OFFSET 216 217#define STD_EXCEPTION(n, label, hdlr) \ 218 . = n; \ 219label: \ 220 EXCEPTION_PROLOG(SRR0, SRR1); \ 221 addi r3,r1,STACK_FRAME_OVERHEAD; \ 222 EXC_XFER_TEMPLATE(label, hdlr, MSR_KERNEL, NOCOPY) \ 223 224#define CRIT_EXCEPTION(n, label, hdlr) \ 225 . = n; \ 226label: \ 227 EXCEPTION_PROLOG(CSRR0, CSRR1); \ 228 addi r3,r1,STACK_FRAME_OVERHEAD; \ 229 EXC_XFER_TEMPLATE(label, hdlr, \ 230 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ 231 232#define MCK_EXCEPTION(n, label, hdlr) \ 233 . = n; \ 234label: \ 235 EXCEPTION_PROLOG(MCSRR0, MCSRR1); \ 236 addi r3,r1,STACK_FRAME_OVERHEAD; \ 237 EXC_XFER_TEMPLATE(label, hdlr, \ 238 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ 239 240#endif /* !E500 */ 241#endif /* __PPC_ASM_TMPL__ */ 242