2 * (C) Copyright 2000-2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 * This file contains all the macros and symbols which define
26 * a PowerPC assembly language environment.
28 #ifndef __PPC_ASM_TMPL__
29 #define __PPC_ASM_TMPL__
31 /***************************************************************************
33 * These definitions simplify the ugly declarations necessary for GOT
36 * Stolen from prepboot/bootldr.h, (C) 1998 Gabriel Paubert, paubert@iram.es
38 * Uses r14 to access the GOT
42 .section ".got2","aw"; \
51 0: .long .LCTOC1-1f ; \
57 #define GOT_ENTRY(NAME) .L_ ## NAME = . - .LCTOC1 ; .long NAME
59 #define GOT(NAME) .L_ ## NAME (r14)
62 /***************************************************************************
99 #if defined(CONFIG_8xx) || defined(CONFIG_MPC824X)
101 /* Some special registers */
103 #define ICR 148 /* Interrupt Cause Register (37-44) */
105 #define COUNTA 150 /* Breakpoint Counter (37-44) */
106 #define COUNTB 151 /* Breakpoint Counter (37-44) */
107 #define LCTRL1 156 /* Load/Store Support (37-40) */
108 #define LCTRL2 157 /* Load/Store Support (37-41) */
111 #endif /* CONFIG_8xx, CONFIG_MPC824X */
114 #if defined(CONFIG_5xx)
115 /* Some special purpose registers */
116 #define DER 149 /* Debug Enable Register */
117 #define COUNTA 150 /* Breakpoint Counter */
118 #define COUNTB 151 /* Breakpoint Counter */
119 #define LCTRL1 156 /* Load/Store Support */
120 #define LCTRL2 157 /* Load/Store Support */
121 #define ICTRL 158 /* I-Bus Support Control Register */
123 #endif /* CONFIG_5xx */
125 #if defined(CONFIG_8xx)
127 /* Registers in the processor's internal memory map that we use.
129 #define SYPCR 0x00000004
130 #define BR0 0x00000100
131 #define OR0 0x00000104
132 #define BR1 0x00000108
133 #define OR1 0x0000010c
134 #define BR2 0x00000110
135 #define OR2 0x00000114
136 #define BR3 0x00000118
137 #define OR3 0x0000011c
138 #define BR4 0x00000120
139 #define OR4 0x00000124
141 #define MAR 0x00000164
142 #define MCR 0x00000168
143 #define MAMR 0x00000170
144 #define MBMR 0x00000174
145 #define MSTAT 0x00000178
146 #define MPTPR 0x0000017a
147 #define MDR 0x0000017c
149 #define TBSCR 0x00000200
150 #define TBREFF0 0x00000204
152 #define PLPRCR 0x00000284
154 #elif defined(CONFIG_8260)
158 #define HID0_IFEM (1<<7)
160 #define HID0_ICE_BITPOS 16
161 #define HID0_DCE_BITPOS 17
163 #define IM_REGBASE 0x10000
164 #define IM_SYPCR (IM_REGBASE+0x0004)
165 #define IM_SWSR (IM_REGBASE+0x000e)
166 #define IM_BR0 (IM_REGBASE+0x0100)
167 #define IM_OR0 (IM_REGBASE+0x0104)
168 #define IM_BR1 (IM_REGBASE+0x0108)
169 #define IM_OR1 (IM_REGBASE+0x010c)
170 #define IM_BR2 (IM_REGBASE+0x0110)
171 #define IM_OR2 (IM_REGBASE+0x0114)
172 #define IM_MPTPR (IM_REGBASE+0x0184)
173 #define IM_PSDMR (IM_REGBASE+0x0190)
174 #define IM_PSRT (IM_REGBASE+0x019c)
175 #define IM_IMMR (IM_REGBASE+0x01a8)
176 #define IM_SCCR (IM_REGBASE+0x0c80)
178 #elif defined(CONFIG_MPC5xxx) || defined(CONFIG_MPC8220)
180 #define HID0_ICE_BITPOS 16
181 #define HID0_DCE_BITPOS 17
192 * Macros for storing registers into and loading registers from
195 #define SAVE_GPR(n, base) stw n,GPR0+4*(n)(base)
196 #define SAVE_2GPRS(n, base) SAVE_GPR(n, base); SAVE_GPR(n+1, base)
197 #define SAVE_4GPRS(n, base) SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base)
198 #define SAVE_8GPRS(n, base) SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base)
199 #define SAVE_10GPRS(n, base) SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base)
200 #define REST_GPR(n, base) lwz n,GPR0+4*(n)(base)
201 #define REST_2GPRS(n, base) REST_GPR(n, base); REST_GPR(n+1, base)
202 #define REST_4GPRS(n, base) REST_2GPRS(n, base); REST_2GPRS(n+2, base)
203 #define REST_8GPRS(n, base) REST_4GPRS(n, base); REST_4GPRS(n+4, base)
204 #define REST_10GPRS(n, base) REST_8GPRS(n, base); REST_2GPRS(n+8, base)
207 * GCC sometimes accesses words at negative offsets from the stack
208 * pointer, although the SysV ABI says it shouldn't. To cope with
209 * this, we leave this much untouched space on the stack on exception
212 #define STACK_UNDERHEAD 64
215 * Exception entry code. This code runs with address translation
216 * turned off, i.e. using physical addresses.
217 * We assume sprg3 has the physical address of the current
218 * task's thread_struct.
220 #define EXCEPTION_PROLOG \
224 subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\
225 stw r20,_CCR(r21); /* save registers */ \
226 stw r22,GPR22(r21); \
227 stw r23,GPR23(r21); \
229 stw r20,GPR20(r21); \
231 stw r22,GPR21(r21); \
233 stw r20,_LINK(r21); \
244 mr r1,r21; /* set new kernel sp */ \
247 * Note: code which follows this uses cr0.eq (set if from kernel),
248 * r21, r22 (SRR0), and r23 (SRR1).
252 * Critical exception entry code. This is just like the other exception
253 * code except that it uses SRR2 and SRR3 instead of SRR0 and SRR1.
255 #define CRITICAL_EXCEPTION_PROLOG \
259 subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\
260 stw r20,_CCR(r21); /* save registers */ \
261 stw r22,GPR22(r21); \
262 stw r23,GPR23(r21); \
264 stw r20,GPR20(r21); \
266 stw r22,GPR21(r21); \
268 stw r20,_LINK(r21); \
273 mfspr r22,990; /* SRR2 */ \
274 mfspr r23,991; /* SRR3 */ \
279 mr r1,r21; /* set new kernel sp */ \
282 * Note: code which follows this uses cr0.eq (set if from kernel),
283 * r21, r22 (SRR2), and r23 (SRR3).
289 * The data words for `hdlr' and `int_return' are initialized with
290 * OFFSET values only; they must be relocated first before they can
293 #define STD_EXCEPTION(n, label, hdlr) \
297 lwz r3,GOT(transfer_to_handler); \
299 addi r3,r1,STACK_FRAME_OVERHEAD; \
301 rlwimi r20,r23,0,25,25; \
304 .long hdlr - _start + EXC_OFF_SYS_RESET; \
305 .long int_return - _start + EXC_OFF_SYS_RESET
308 #define CRIT_EXCEPTION(n, label, hdlr) \
311 CRITICAL_EXCEPTION_PROLOG; \
312 lwz r3,GOT(transfer_to_handler); \
314 addi r3,r1,STACK_FRAME_OVERHEAD; \
315 li r20,(MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)); \
316 rlwimi r20,r23,0,25,25; \
319 .long hdlr - _start + EXC_OFF_SYS_RESET; \
320 .long crit_return - _start + EXC_OFF_SYS_RESET
322 #endif /* __PPC_ASM_TMPL__ */