/* SPDX-License-Identifier: GPL-2.0+ */ /* * (C) Copyright 2000-2002 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. */ /* * This file contains all the macros and symbols which define * a PowerPC assembly language environment. */ #ifndef __PPC_ASM_TMPL__ #define __PPC_ASM_TMPL__ #include <config.h> /*************************************************************************** * * These definitions simplify the ugly declarations necessary for GOT * definitions. * * Stolen from prepboot/bootldr.h, (C) 1998 Gabriel Paubert, paubert@iram.es * * Uses r12 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 r12 ; \ lwz r0,0b-1b(r12) ; \ add r12,r0,r12 ; #define GOT_ENTRY(NAME) .L_ ## NAME = . - .LCTOC1 ; .long NAME #define GOT(NAME) .L_ ## NAME (r12) /*************************************************************************** * 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_MPC8xx) /* 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_MPC8xx */ #if defined(CONFIG_MPC8xx) /* 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 #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(reg1, reg2) \ 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 r20, DAR_DEAR; \ stw r20,_DAR(r21); \ mfspr r22,reg1; \ mfspr r23,reg2; \ 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). */ /* * 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 COPY_EE(d, s) rlwimi d,s,0,16,16 #define NOCOPY(d, s) #ifdef CONFIG_E500 #define EXC_XFER_TEMPLATE(n, label, hdlr, msr, copyee) \ stw r22,_NIP(r21); \ stw r23,_MSR(r21); \ li r23,n; \ stw r23,TRAP(r21); \ li r20,msr; \ copyee(r20,r23); \ rlwimi r20,r23,0,25,25; \ mtmsr r20; \ bl 1f; \ 1: mflr r23; \ addis r23,r23,(hdlr - 1b)@ha; \ addi r23,r23,(hdlr - 1b)@l; \ b transfer_to_handler #define STD_EXCEPTION(n, label, hdlr) \ .align 4; \ label: \ EXCEPTION_PROLOG(SRR0, SRR1); \ addi r3,r1,STACK_FRAME_OVERHEAD; \ EXC_XFER_TEMPLATE(n, label, hdlr, MSR_KERNEL, NOCOPY) \ #define CRIT_EXCEPTION(n, label, hdlr) \ .align 4; \ label: \ EXCEPTION_PROLOG(CSRR0, CSRR1); \ addi r3,r1,STACK_FRAME_OVERHEAD; \ EXC_XFER_TEMPLATE(n, label, hdlr, \ MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ #define MCK_EXCEPTION(n, label, hdlr) \ .align 4; \ label: \ EXCEPTION_PROLOG(MCSRR0, MCSRR1); \ addi r3,r1,STACK_FRAME_OVERHEAD; \ EXC_XFER_TEMPLATE(n, label, hdlr, \ MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ #else /* !E500 */ #define EXC_XFER_TEMPLATE(label, hdlr, msr, copyee) \ bl 1f; \ 1: mflr r20; \ lwz r20,(.L_ ## label)-1b+8(r20); \ mtlr r20; \ li r20,msr; \ copyee(r20,r23); \ rlwimi r20,r23,0,25,25; \ blrl; \ .L_ ## label : \ .long hdlr - _start + _START_OFFSET; \ .long int_return - _start + _START_OFFSET; \ .long transfer_to_handler - _start + _START_OFFSET #define STD_EXCEPTION(n, label, hdlr) \ . = n; \ label: \ EXCEPTION_PROLOG(SRR0, SRR1); \ addi r3,r1,STACK_FRAME_OVERHEAD; \ EXC_XFER_TEMPLATE(label, hdlr, MSR_KERNEL, NOCOPY) \ #define CRIT_EXCEPTION(n, label, hdlr) \ . = n; \ label: \ EXCEPTION_PROLOG(CSRR0, CSRR1); \ addi r3,r1,STACK_FRAME_OVERHEAD; \ EXC_XFER_TEMPLATE(label, hdlr, \ MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ #define MCK_EXCEPTION(n, label, hdlr) \ . = n; \ label: \ EXCEPTION_PROLOG(MCSRR0, MCSRR1); \ addi r3,r1,STACK_FRAME_OVERHEAD; \ EXC_XFER_TEMPLATE(label, hdlr, \ MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \ #endif /* !E500 */ #endif /* __PPC_ASM_TMPL__ */