2 * (C) Copyright 2000-2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * SPDX-License-Identifier: GPL-2.0+
9 * This file contains all the macros and symbols which define
10 * a PowerPC assembly language environment.
12 #ifndef __PPC_ASM_TMPL__
13 #define __PPC_ASM_TMPL__
15 /***************************************************************************
17 * These definitions simplify the ugly declarations necessary for GOT
20 * Stolen from prepboot/bootldr.h, (C) 1998 Gabriel Paubert, paubert@iram.es
22 * Uses r12 to access the GOT
26 .section ".got2","aw"; \
35 0: .long .LCTOC1-1f ; \
41 #define GOT_ENTRY(NAME) .L_ ## NAME = . - .LCTOC1 ; .long NAME
43 #define GOT(NAME) .L_ ## NAME (r12)
46 /***************************************************************************
83 #if defined(CONFIG_8xx) || defined(CONFIG_MPC824X)
85 /* Some special registers */
87 #define ICR 148 /* Interrupt Cause Register (37-44) */
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) */
95 #endif /* CONFIG_8xx, CONFIG_MPC824X */
98 #if defined(CONFIG_5xx)
99 /* Some special purpose registers */
100 #define DER 149 /* Debug Enable Register */
101 #define COUNTA 150 /* Breakpoint Counter */
102 #define COUNTB 151 /* Breakpoint Counter */
103 #define LCTRL1 156 /* Load/Store Support */
104 #define LCTRL2 157 /* Load/Store Support */
105 #define ICTRL 158 /* I-Bus Support Control Register */
107 #endif /* CONFIG_5xx */
109 #if defined(CONFIG_8xx)
111 /* Registers in the processor's internal memory map that we use.
113 #define SYPCR 0x00000004
114 #define BR0 0x00000100
115 #define OR0 0x00000104
116 #define BR1 0x00000108
117 #define OR1 0x0000010c
118 #define BR2 0x00000110
119 #define OR2 0x00000114
120 #define BR3 0x00000118
121 #define OR3 0x0000011c
122 #define BR4 0x00000120
123 #define OR4 0x00000124
125 #define MAR 0x00000164
126 #define MCR 0x00000168
127 #define MAMR 0x00000170
128 #define MBMR 0x00000174
129 #define MSTAT 0x00000178
130 #define MPTPR 0x0000017a
131 #define MDR 0x0000017c
133 #define TBSCR 0x00000200
134 #define TBREFF0 0x00000204
136 #define PLPRCR 0x00000284
138 #elif defined(CONFIG_8260)
142 #define HID0_IFEM (1<<7)
144 #define HID0_ICE_BITPOS 16
145 #define HID0_DCE_BITPOS 17
147 #define IM_REGBASE 0x10000
148 #define IM_SYPCR (IM_REGBASE+0x0004)
149 #define IM_SWSR (IM_REGBASE+0x000e)
150 #define IM_BR0 (IM_REGBASE+0x0100)
151 #define IM_OR0 (IM_REGBASE+0x0104)
152 #define IM_BR1 (IM_REGBASE+0x0108)
153 #define IM_OR1 (IM_REGBASE+0x010c)
154 #define IM_BR2 (IM_REGBASE+0x0110)
155 #define IM_OR2 (IM_REGBASE+0x0114)
156 #define IM_MPTPR (IM_REGBASE+0x0184)
157 #define IM_PSDMR (IM_REGBASE+0x0190)
158 #define IM_PSRT (IM_REGBASE+0x019c)
159 #define IM_IMMR (IM_REGBASE+0x01a8)
160 #define IM_SCCR (IM_REGBASE+0x0c80)
162 #elif defined(CONFIG_MPC5xxx)
164 #define HID0_ICE_BITPOS 16
165 #define HID0_DCE_BITPOS 17
176 * Macros for storing registers into and loading registers from
179 #define SAVE_GPR(n, base) stw n,GPR0+4*(n)(base)
180 #define SAVE_2GPRS(n, base) SAVE_GPR(n, base); SAVE_GPR(n+1, base)
181 #define SAVE_4GPRS(n, base) SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base)
182 #define SAVE_8GPRS(n, base) SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base)
183 #define SAVE_10GPRS(n, base) SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base)
184 #define REST_GPR(n, base) lwz n,GPR0+4*(n)(base)
185 #define REST_2GPRS(n, base) REST_GPR(n, base); REST_GPR(n+1, base)
186 #define REST_4GPRS(n, base) REST_2GPRS(n, base); REST_2GPRS(n+2, base)
187 #define REST_8GPRS(n, base) REST_4GPRS(n, base); REST_4GPRS(n+4, base)
188 #define REST_10GPRS(n, base) REST_8GPRS(n, base); REST_2GPRS(n+8, base)
191 * GCC sometimes accesses words at negative offsets from the stack
192 * pointer, although the SysV ABI says it shouldn't. To cope with
193 * this, we leave this much untouched space on the stack on exception
196 #define STACK_UNDERHEAD 64
199 * Exception entry code. This code runs with address translation
200 * turned off, i.e. using physical addresses.
201 * We assume sprg3 has the physical address of the current
202 * task's thread_struct.
204 #define EXCEPTION_PROLOG(reg1, reg2) \
208 subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\
209 stw r20,_CCR(r21); /* save registers */ \
210 stw r22,GPR22(r21); \
211 stw r23,GPR23(r21); \
213 stw r20,GPR20(r21); \
215 stw r22,GPR21(r21); \
217 stw r20,_LINK(r21); \
222 mfspr r20, DAR_DEAR; \
230 mr r1,r21; /* set new kernel sp */ \
233 * Note: code which follows this uses cr0.eq (set if from kernel),
234 * r21, r22 (SRR0), and r23 (SRR1).
240 * The data words for `hdlr' and `int_return' are initialized with
241 * OFFSET values only; they must be relocated first before they can
244 #define COPY_EE(d, s) rlwimi d,s,0,16,16
246 #define EXC_XFER_TEMPLATE(label, hdlr, msr, copyee) \
249 lwz r20,(.L_ ## label)-1b+8(r20); \
253 rlwimi r20,r23,0,25,25; \
256 .long hdlr - _start + _START_OFFSET; \
257 .long int_return - _start + _START_OFFSET; \
258 .long transfer_to_handler - _start + _START_OFFSET
260 #define STD_EXCEPTION(n, label, hdlr) \
263 EXCEPTION_PROLOG(SRR0, SRR1); \
264 addi r3,r1,STACK_FRAME_OVERHEAD; \
265 EXC_XFER_TEMPLATE(label, hdlr, MSR_KERNEL, NOCOPY) \
267 #define CRIT_EXCEPTION(n, label, hdlr) \
270 EXCEPTION_PROLOG(CSRR0, CSRR1); \
271 addi r3,r1,STACK_FRAME_OVERHEAD; \
272 EXC_XFER_TEMPLATE(label, hdlr, \
273 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \
275 #define MCK_EXCEPTION(n, label, hdlr) \
278 EXCEPTION_PROLOG(MCSRR0, MCSRR1); \
279 addi r3,r1,STACK_FRAME_OVERHEAD; \
280 EXC_XFER_TEMPLATE(label, hdlr, \
281 MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \
283 #endif /* __PPC_ASM_TMPL__ */