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#if defined(CONFIG_MPC5xxx) 85 86#define HID0_ICE_BITPOS 16 87#define HID0_DCE_BITPOS 17 88 89#endif 90 91#define curptr r2 92 93#define SYNC \ 94 sync; \ 95 isync 96 97/* 98 * Macros for storing registers into and loading registers from 99 * exception frames. 100 */ 101#define SAVE_GPR(n, base) stw n,GPR0+4*(n)(base) 102#define SAVE_2GPRS(n, base) SAVE_GPR(n, base); SAVE_GPR(n+1, base) 103#define SAVE_4GPRS(n, base) SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base) 104#define SAVE_8GPRS(n, base) SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base) 105#define SAVE_10GPRS(n, base) SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base) 106#define REST_GPR(n, base) lwz n,GPR0+4*(n)(base) 107#define REST_2GPRS(n, base) REST_GPR(n, base); REST_GPR(n+1, base) 108#define REST_4GPRS(n, base) REST_2GPRS(n, base); REST_2GPRS(n+2, base) 109#define REST_8GPRS(n, base) REST_4GPRS(n, base); REST_4GPRS(n+4, base) 110#define REST_10GPRS(n, base) REST_8GPRS(n, base); REST_2GPRS(n+8, base) 111 112/* 113 * GCC sometimes accesses words at negative offsets from the stack 114 * pointer, although the SysV ABI says it shouldn't. To cope with 115 * this, we leave this much untouched space on the stack on exception 116 * entry. 117 */ 118#define STACK_UNDERHEAD 64 119 120/* 121 * Exception entry code. This code runs with address translation 122 * turned off, i.e. using physical addresses. 123 * We assume sprg3 has the physical address of the current 124 * task's thread_struct. 125 */ 126#define EXCEPTION_PROLOG(reg1, reg2) \ 127 mtspr SPRG0,r20; \ 128 mtspr SPRG1,r21; \ 129 mfcr r20; \ 130 subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\ 131 stw r20,_CCR(r21); /* save registers */ \ 132 stw r22,GPR22(r21); \ 133 stw r23,GPR23(r21); \ 134 mfspr r20,SPRG0; \ 135 stw r20,GPR20(r21); \ 136 mfspr r22,SPRG1; \ 137 stw r22,GPR21(r21); \ 138 mflr r20; \ 139 stw r20,_LINK(r21); \ 140 mfctr r22; \ 141 stw r22,_CTR(r21); \ 142 mfspr r20,XER; \ 143 stw r20,_XER(r21); \ 144 mfspr r20, DAR_DEAR; \ 145 stw r20,_DAR(r21); \ 146 mfspr r22,reg1; \ 147 mfspr r23,reg2; \ 148 stw r0,GPR0(r21); \ 149 stw r1,GPR1(r21); \ 150 stw r2,GPR2(r21); \ 151 stw r1,0(r21); \ 152 mr r1,r21; /* set new kernel sp */ \ 153 SAVE_4GPRS(3, r21); 154/* 155 * Note: code which follows this uses cr0.eq (set if from kernel), 156 * r21, r22 (SRR0), and r23 (SRR1). 157 */ 158 159/* 160 * Exception vectors. 161 * 162 * The data words for `hdlr' and `int_return' are initialized with 163 * OFFSET values only; they must be relocated first before they can 164 * be used! 165 */ 166#define COPY_EE(d, s) rlwimi d,s,0,16,16 167#define NOCOPY(d, s) 168 169#ifdef CONFIG_E500 170#define EXC_XFER_TEMPLATE(n, label, hdlr, msr, copyee) \ 171 stw r22,_NIP(r21); \ 172 stw r23,_MSR(r21); \ 173 li r23,n; \ 174 stw r23,TRAP(r21); \ 175 li r20,msr; \ 176 copyee(r20,r23); \ 177 rlwimi r20,r23,0,25,25; \ 178 mtmsr r20; \ 179 bl 1f; \ 1801: mflr r23; \ 181 addis r23,r23,(hdlr - 1b)@ha; \ 182 addi r23,r23,(hdlr - 1b)@l; \ 183 b transfer_to_handler 184 185#define STD_EXCEPTION(n, label, hdlr) \ 186.align 4; \ 187label: \ 188 EXCEPTION_PROLOG(SRR0, SRR1); \ 189 addi r3,r1,STACK_FRAME_OVERHEAD; \ 190 EXC_XFER_TEMPLATE(n, label, hdlr, MSR_KERNEL, NOCOPY) \ 191 192#define CRIT_EXCEPTION(n, label, hdlr) \ 193.align 4; \ 194label: \ 195 EXCEPTION_PROLOG(CSRR0, CSRR1); \ 196 addi r3,r1,STACK_FRAME_OVERHEAD; \ 197 EXC_XFER_TEMPLATE(n, label, hdlr, \ 198 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ 199 200#define MCK_EXCEPTION(n, label, hdlr) \ 201.align 4; \ 202label: \ 203 EXCEPTION_PROLOG(MCSRR0, MCSRR1); \ 204 addi r3,r1,STACK_FRAME_OVERHEAD; \ 205 EXC_XFER_TEMPLATE(n, label, hdlr, \ 206 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ 207 208#else /* !E500 */ 209 210#define EXC_XFER_TEMPLATE(label, hdlr, msr, copyee) \ 211 bl 1f; \ 2121: mflr r20; \ 213 lwz r20,(.L_ ## label)-1b+8(r20); \ 214 mtlr r20; \ 215 li r20,msr; \ 216 copyee(r20,r23); \ 217 rlwimi r20,r23,0,25,25; \ 218 blrl; \ 219.L_ ## label : \ 220 .long hdlr - _start + _START_OFFSET; \ 221 .long int_return - _start + _START_OFFSET; \ 222 .long transfer_to_handler - _start + _START_OFFSET 223 224#define STD_EXCEPTION(n, label, hdlr) \ 225 . = n; \ 226label: \ 227 EXCEPTION_PROLOG(SRR0, SRR1); \ 228 addi r3,r1,STACK_FRAME_OVERHEAD; \ 229 EXC_XFER_TEMPLATE(label, hdlr, MSR_KERNEL, NOCOPY) \ 230 231#define CRIT_EXCEPTION(n, label, hdlr) \ 232 . = n; \ 233label: \ 234 EXCEPTION_PROLOG(CSRR0, CSRR1); \ 235 addi r3,r1,STACK_FRAME_OVERHEAD; \ 236 EXC_XFER_TEMPLATE(label, hdlr, \ 237 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ 238 239#define MCK_EXCEPTION(n, label, hdlr) \ 240 . = n; \ 241label: \ 242 EXCEPTION_PROLOG(MCSRR0, MCSRR1); \ 243 addi r3,r1,STACK_FRAME_OVERHEAD; \ 244 EXC_XFER_TEMPLATE(label, hdlr, \ 245 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ 246 247#endif /* !E500 */ 248#endif /* __PPC_ASM_TMPL__ */ 249