1/* SPDX-License-Identifier: GPL-2.0+ */ 2/* 3 * (C) Copyright 2000-2002 4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 5 */ 6 7/* 8 * This file contains all the macros and symbols which define 9 * a PowerPC assembly language environment. 10 */ 11#ifndef __PPC_ASM_TMPL__ 12#define __PPC_ASM_TMPL__ 13 14#include <config.h> 15 16/*************************************************************************** 17 * 18 * These definitions simplify the ugly declarations necessary for GOT 19 * definitions. 20 * 21 * Stolen from prepboot/bootldr.h, (C) 1998 Gabriel Paubert, paubert@iram.es 22 * 23 * Uses r12 to access the GOT 24 */ 25 26#define START_GOT \ 27 .section ".got2","aw"; \ 28.LCTOC1 = .+32768 29 30#define END_GOT \ 31 .text 32 33#define GET_GOT \ 34 bl 1f ; \ 35 .text 2 ; \ 360: .long .LCTOC1-1f ; \ 37 .text ; \ 381: mflr r12 ; \ 39 lwz r0,0b-1b(r12) ; \ 40 add r12,r0,r12 ; 41 42#define GOT_ENTRY(NAME) .L_ ## NAME = . - .LCTOC1 ; .long NAME 43 44#define GOT(NAME) .L_ ## NAME (r12) 45 46 47/*************************************************************************** 48 * Register names 49 */ 50#define r0 0 51#define r1 1 52#define r2 2 53#define r3 3 54#define r4 4 55#define r5 5 56#define r6 6 57#define r7 7 58#define r8 8 59#define r9 9 60#define r10 10 61#define r11 11 62#define r12 12 63#define r13 13 64#define r14 14 65#define r15 15 66#define r16 16 67#define r17 17 68#define r18 18 69#define r19 19 70#define r20 20 71#define r21 21 72#define r22 22 73#define r23 23 74#define r24 24 75#define r25 25 76#define r26 26 77#define r27 27 78#define r28 28 79#define r29 29 80#define r30 30 81#define r31 31 82 83#if defined(CONFIG_MPC8xx) 84 85/* Some special registers */ 86 87#define ICR 148 /* Interrupt Cause Register (37-44) */ 88#define DER 149 89#define COUNTA 150 /* Breakpoint Counter (37-44) */ 90#define COUNTB 151 /* Breakpoint Counter (37-44) */ 91#define LCTRL1 156 /* Load/Store Support (37-40) */ 92#define LCTRL2 157 /* Load/Store Support (37-41) */ 93#define ICTRL 158 94 95#endif /* CONFIG_MPC8xx */ 96 97 98#if defined(CONFIG_MPC8xx) 99 100/* Registers in the processor's internal memory map that we use. 101*/ 102#define SYPCR 0x00000004 103#define BR0 0x00000100 104#define OR0 0x00000104 105#define BR1 0x00000108 106#define OR1 0x0000010c 107#define BR2 0x00000110 108#define OR2 0x00000114 109#define BR3 0x00000118 110#define OR3 0x0000011c 111#define BR4 0x00000120 112#define OR4 0x00000124 113 114#define MAR 0x00000164 115#define MCR 0x00000168 116#define MAMR 0x00000170 117#define MBMR 0x00000174 118#define MSTAT 0x00000178 119#define MPTPR 0x0000017a 120#define MDR 0x0000017c 121 122#define TBSCR 0x00000200 123#define TBREFF0 0x00000204 124 125#define PLPRCR 0x00000284 126 127#endif 128 129#define curptr r2 130 131#define SYNC \ 132 sync; \ 133 isync 134 135/* 136 * Macros for storing registers into and loading registers from 137 * exception frames. 138 */ 139#define SAVE_GPR(n, base) stw n,GPR0+4*(n)(base) 140#define SAVE_2GPRS(n, base) SAVE_GPR(n, base); SAVE_GPR(n+1, base) 141#define SAVE_4GPRS(n, base) SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base) 142#define SAVE_8GPRS(n, base) SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base) 143#define SAVE_10GPRS(n, base) SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base) 144#define REST_GPR(n, base) lwz n,GPR0+4*(n)(base) 145#define REST_2GPRS(n, base) REST_GPR(n, base); REST_GPR(n+1, base) 146#define REST_4GPRS(n, base) REST_2GPRS(n, base); REST_2GPRS(n+2, base) 147#define REST_8GPRS(n, base) REST_4GPRS(n, base); REST_4GPRS(n+4, base) 148#define REST_10GPRS(n, base) REST_8GPRS(n, base); REST_2GPRS(n+8, base) 149 150/* 151 * GCC sometimes accesses words at negative offsets from the stack 152 * pointer, although the SysV ABI says it shouldn't. To cope with 153 * this, we leave this much untouched space on the stack on exception 154 * entry. 155 */ 156#define STACK_UNDERHEAD 64 157 158/* 159 * Exception entry code. This code runs with address translation 160 * turned off, i.e. using physical addresses. 161 * We assume sprg3 has the physical address of the current 162 * task's thread_struct. 163 */ 164#define EXCEPTION_PROLOG(reg1, reg2) \ 165 mtspr SPRG0,r20; \ 166 mtspr SPRG1,r21; \ 167 mfcr r20; \ 168 subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\ 169 stw r20,_CCR(r21); /* save registers */ \ 170 stw r22,GPR22(r21); \ 171 stw r23,GPR23(r21); \ 172 mfspr r20,SPRG0; \ 173 stw r20,GPR20(r21); \ 174 mfspr r22,SPRG1; \ 175 stw r22,GPR21(r21); \ 176 mflr r20; \ 177 stw r20,_LINK(r21); \ 178 mfctr r22; \ 179 stw r22,_CTR(r21); \ 180 mfspr r20,XER; \ 181 stw r20,_XER(r21); \ 182 mfspr r20, DAR_DEAR; \ 183 stw r20,_DAR(r21); \ 184 mfspr r22,reg1; \ 185 mfspr r23,reg2; \ 186 stw r0,GPR0(r21); \ 187 stw r1,GPR1(r21); \ 188 stw r2,GPR2(r21); \ 189 stw r1,0(r21); \ 190 mr r1,r21; /* set new kernel sp */ \ 191 SAVE_4GPRS(3, r21); 192/* 193 * Note: code which follows this uses cr0.eq (set if from kernel), 194 * r21, r22 (SRR0), and r23 (SRR1). 195 */ 196 197/* 198 * Exception vectors. 199 * 200 * The data words for `hdlr' and `int_return' are initialized with 201 * OFFSET values only; they must be relocated first before they can 202 * be used! 203 */ 204#define COPY_EE(d, s) rlwimi d,s,0,16,16 205#define NOCOPY(d, s) 206 207#ifdef CONFIG_E500 208#define EXC_XFER_TEMPLATE(n, label, hdlr, msr, copyee) \ 209 stw r22,_NIP(r21); \ 210 stw r23,_MSR(r21); \ 211 li r23,n; \ 212 stw r23,TRAP(r21); \ 213 li r20,msr; \ 214 copyee(r20,r23); \ 215 rlwimi r20,r23,0,25,25; \ 216 mtmsr r20; \ 217 bl 1f; \ 2181: mflr r23; \ 219 addis r23,r23,(hdlr - 1b)@ha; \ 220 addi r23,r23,(hdlr - 1b)@l; \ 221 b transfer_to_handler 222 223#define STD_EXCEPTION(n, label, hdlr) \ 224.align 4; \ 225label: \ 226 EXCEPTION_PROLOG(SRR0, SRR1); \ 227 addi r3,r1,STACK_FRAME_OVERHEAD; \ 228 EXC_XFER_TEMPLATE(n, label, hdlr, MSR_KERNEL, NOCOPY) \ 229 230#define CRIT_EXCEPTION(n, label, hdlr) \ 231.align 4; \ 232label: \ 233 EXCEPTION_PROLOG(CSRR0, CSRR1); \ 234 addi r3,r1,STACK_FRAME_OVERHEAD; \ 235 EXC_XFER_TEMPLATE(n, label, hdlr, \ 236 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ 237 238#define MCK_EXCEPTION(n, label, hdlr) \ 239.align 4; \ 240label: \ 241 EXCEPTION_PROLOG(MCSRR0, MCSRR1); \ 242 addi r3,r1,STACK_FRAME_OVERHEAD; \ 243 EXC_XFER_TEMPLATE(n, label, hdlr, \ 244 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ 245 246#else /* !E500 */ 247 248#define EXC_XFER_TEMPLATE(label, hdlr, msr, copyee) \ 249 bl 1f; \ 2501: mflr r20; \ 251 lwz r20,(.L_ ## label)-1b+8(r20); \ 252 mtlr r20; \ 253 li r20,msr; \ 254 copyee(r20,r23); \ 255 rlwimi r20,r23,0,25,25; \ 256 blrl; \ 257.L_ ## label : \ 258 .long hdlr - _start + _START_OFFSET; \ 259 .long int_return - _start + _START_OFFSET; \ 260 .long transfer_to_handler - _start + _START_OFFSET 261 262#define STD_EXCEPTION(n, label, hdlr) \ 263 . = n; \ 264label: \ 265 EXCEPTION_PROLOG(SRR0, SRR1); \ 266 addi r3,r1,STACK_FRAME_OVERHEAD; \ 267 EXC_XFER_TEMPLATE(label, hdlr, MSR_KERNEL, NOCOPY) \ 268 269#define CRIT_EXCEPTION(n, label, hdlr) \ 270 . = n; \ 271label: \ 272 EXCEPTION_PROLOG(CSRR0, CSRR1); \ 273 addi r3,r1,STACK_FRAME_OVERHEAD; \ 274 EXC_XFER_TEMPLATE(label, hdlr, \ 275 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ 276 277#define MCK_EXCEPTION(n, label, hdlr) \ 278 . = n; \ 279label: \ 280 EXCEPTION_PROLOG(MCSRR0, MCSRR1); \ 281 addi r3,r1,STACK_FRAME_OVERHEAD; \ 282 EXC_XFER_TEMPLATE(label, hdlr, \ 283 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ 284 285#endif /* !E500 */ 286#endif /* __PPC_ASM_TMPL__ */ 287