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wdenk 2002-08-20 21:10:12 +00:00
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/*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*
* This file contains all the macros and symbols which define
* a PowerPC assembly language environment.
*/
#ifndef __PPC_ASM_TMPL__
#define __PPC_ASM_TMPL__
/***************************************************************************
*
* These definitions simplify the ugly declarations necessary for GOT
* definitions.
*
* Stolen from prepboot/bootldr.h, (C) 1998 Gabriel Paubert, paubert@iram.es
*
* Uses r14 to access the GOT
*/
#define START_GOT \
.section ".got2","aw"; \
.LCTOC1 = .+32768
#define END_GOT \
.text
#define GET_GOT \
bl 1f ; \
.text 2 ; \
0: .long .LCTOC1-1f ; \
.text ; \
1: mflr r14 ; \
lwz r0,0b-1b(r14) ; \
add r14,r0,r14 ;
#define GOT_ENTRY(NAME) .L_ ## NAME = . - .LCTOC1 ; .long NAME
#define GOT(NAME) .L_ ## NAME (r14)
/***************************************************************************
* Register names
*/
#define r0 0
#define r1 1
#define r2 2
#define r3 3
#define r4 4
#define r5 5
#define r6 6
#define r7 7
#define r8 8
#define r9 9
#define r10 10
#define r11 11
#define r12 12
#define r13 13
#define r14 14
#define r15 15
#define r16 16
#define r17 17
#define r18 18
#define r19 19
#define r20 20
#define r21 21
#define r22 22
#define r23 23
#define r24 24
#define r25 25
#define r26 26
#define r27 27
#define r28 28
#define r29 29
#define r30 30
#define r31 31
#if defined(CONFIG_8xx) || defined(CONFIG_MPC824X)
/* Some special registers */
#define ICR 148 /* Interrupt Cause Register (37-44) */
#define DER 149
#define COUNTA 150 /* Breakpoint Counter (37-44) */
#define COUNTB 151 /* Breakpoint Counter (37-44) */
#define LCTRL1 156 /* Load/Store Support (37-40) */
#define LCTRL2 157 /* Load/Store Support (37-41) */
#define ICTRL 158
#endif /* CONFIG_8xx, CONFIG_MPC824X */
#if defined(CONFIG_8xx)
/* Registers in the processor's internal memory map that we use.
*/
#define SYPCR 0x00000004
#define BR0 0x00000100
#define OR0 0x00000104
#define BR1 0x00000108
#define OR1 0x0000010c
#define BR2 0x00000110
#define OR2 0x00000114
#define BR3 0x00000118
#define OR3 0x0000011c
#define BR4 0x00000120
#define OR4 0x00000124
#define MAR 0x00000164
#define MCR 0x00000168
#define MAMR 0x00000170
#define MBMR 0x00000174
#define MSTAT 0x00000178
#define MPTPR 0x0000017a
#define MDR 0x0000017c
#define TBSCR 0x00000200
#define TBREFF0 0x00000204
#define PLPRCR 0x00000284
#elif defined(CONFIG_8260)
#define HID2 1011
#define HID0_IFEM (1<<7)
#define HID0_ICE_BITPOS 16
#define HID0_DCE_BITPOS 17
#define IM_REGBASE 0x10000
#define IM_SYPCR (IM_REGBASE+0x0004)
#define IM_SWSR (IM_REGBASE+0x000e)
#define IM_BR0 (IM_REGBASE+0x0100)
#define IM_OR0 (IM_REGBASE+0x0104)
#define IM_BR1 (IM_REGBASE+0x0108)
#define IM_OR1 (IM_REGBASE+0x010c)
#define IM_BR2 (IM_REGBASE+0x0110)
#define IM_OR2 (IM_REGBASE+0x0114)
#define IM_MPTPR (IM_REGBASE+0x0184)
#define IM_PSDMR (IM_REGBASE+0x0190)
#define IM_PSRT (IM_REGBASE+0x019c)
#define IM_IMMR (IM_REGBASE+0x01a8)
#define IM_SCCR (IM_REGBASE+0x0c80)
#endif
#define curptr r2
#define SYNC \
sync; \
isync
/*
* Macros for storing registers into and loading registers from
* exception frames.
*/
#define SAVE_GPR(n, base) stw n,GPR0+4*(n)(base)
#define SAVE_2GPRS(n, base) SAVE_GPR(n, base); SAVE_GPR(n+1, base)
#define SAVE_4GPRS(n, base) SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base)
#define SAVE_8GPRS(n, base) SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base)
#define SAVE_10GPRS(n, base) SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base)
#define REST_GPR(n, base) lwz n,GPR0+4*(n)(base)
#define REST_2GPRS(n, base) REST_GPR(n, base); REST_GPR(n+1, base)
#define REST_4GPRS(n, base) REST_2GPRS(n, base); REST_2GPRS(n+2, base)
#define REST_8GPRS(n, base) REST_4GPRS(n, base); REST_4GPRS(n+4, base)
#define REST_10GPRS(n, base) REST_8GPRS(n, base); REST_2GPRS(n+8, base)
/*
* GCC sometimes accesses words at negative offsets from the stack
* pointer, although the SysV ABI says it shouldn't. To cope with
* this, we leave this much untouched space on the stack on exception
* entry.
*/
#define STACK_UNDERHEAD 64
/*
* Exception entry code. This code runs with address translation
* turned off, i.e. using physical addresses.
* We assume sprg3 has the physical address of the current
* task's thread_struct.
*/
#define EXCEPTION_PROLOG \
mtspr SPRG0,r20; \
mtspr SPRG1,r21; \
mfcr r20; \
subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\
stw r20,_CCR(r21); /* save registers */ \
stw r22,GPR22(r21); \
stw r23,GPR23(r21); \
mfspr r20,SPRG0; \
stw r20,GPR20(r21); \
mfspr r22,SPRG1; \
stw r22,GPR21(r21); \
mflr r20; \
stw r20,_LINK(r21); \
mfctr r22; \
stw r22,_CTR(r21); \
mfspr r20,XER; \
stw r20,_XER(r21); \
mfspr r22,SRR0; \
mfspr r23,SRR1; \
stw r0,GPR0(r21); \
stw r1,GPR1(r21); \
stw r2,GPR2(r21); \
stw r1,0(r21); \
mr r1,r21; /* set new kernel sp */ \
SAVE_4GPRS(3, r21);
/*
* Note: code which follows this uses cr0.eq (set if from kernel),
* r21, r22 (SRR0), and r23 (SRR1).
*/
/*
* Critical exception entry code. This is just like the other exception
* code except that it uses SRR2 and SRR3 instead of SRR0 and SRR1.
*/
#define CRITICAL_EXCEPTION_PROLOG \
mtspr SPRG0,r20; \
mtspr SPRG1,r21; \
mfcr r20; \
subi r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD; /* alloc exc. frame */\
stw r20,_CCR(r21); /* save registers */ \
stw r22,GPR22(r21); \
stw r23,GPR23(r21); \
mfspr r20,SPRG0; \
stw r20,GPR20(r21); \
mfspr r22,SPRG1; \
stw r22,GPR21(r21); \
mflr r20; \
stw r20,_LINK(r21); \
mfctr r22; \
stw r22,_CTR(r21); \
mfspr r20,XER; \
stw r20,_XER(r21); \
mfspr r22,990; /* SRR2 */ \
mfspr r23,991; /* SRR3 */ \
stw r0,GPR0(r21); \
stw r1,GPR1(r21); \
stw r2,GPR2(r21); \
stw r1,0(r21); \
mr r1,r21; /* set new kernel sp */ \
SAVE_4GPRS(3, r21);
/*
* Note: code which follows this uses cr0.eq (set if from kernel),
* r21, r22 (SRR2), and r23 (SRR3).
*/
/*
* Exception vectors.
*
* The data words for `hdlr' and `int_return' are initialized with
* OFFSET values only; they must be relocated first before they can
* be used!
*/
#define STD_EXCEPTION(n, label, hdlr) \
. = n; \
label: \
EXCEPTION_PROLOG; \
lwz r3,GOT(transfer_to_handler); \
mtlr r3; \
addi r3,r1,STACK_FRAME_OVERHEAD; \
li r20,MSR_KERNEL; \
rlwimi r20,r23,0,25,25; \
blrl ; \
.L_ ## label : \
.long hdlr - _start + EXC_OFF_SYS_RESET; \
.long int_return - _start + EXC_OFF_SYS_RESET
#define CRIT_EXCEPTION(n, label, hdlr) \
. = n; \
label: \
CRITICAL_EXCEPTION_PROLOG; \
lwz r3,GOT(transfer_to_handler); \
mtlr r3; \
addi r3,r1,STACK_FRAME_OVERHEAD; \
li r20,MSR_KERNEL; \
rlwimi r20,r23,0,25,25; \
blrl ; \
.L_ ## label : \
.long hdlr - _start + EXC_OFF_SYS_RESET; \
.long crit_return - _start + EXC_OFF_SYS_RESET
#endif /* __PPC_ASM_TMPL__ */