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   1 /*
   2  * (C) Copyright 2000-2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /*
   9  * This file contains all the macros and symbols which define
  10  * a PowerPC assembly language environment.
  11  */
  12 #ifndef __PPC_ASM_TMPL__
  13 #define __PPC_ASM_TMPL__
  14
  15 #include <config.h>
  16
  17 /***************************************************************************
  18  *
  19  * These definitions simplify the ugly declarations necessary for GOT
  20  * definitions.
  21  *
  22  * Stolen from prepboot/bootldr.h, (C) 1998 Gabriel Paubert, paubert@iram.es
  23  *
  24  * Uses r12 to access the GOT
  25  */
  26
  27 #define START_GOT                       \
  28         .section        ".got2","aw";   \
  29 .LCTOC1 = .+32768
  30
  31 #define END_GOT                         \
  32         .text
  33
  34 #define GET_GOT                         \
  35         bl      1f              ;       \
  36         .text   2               ;       \
  37 0:      .long   .LCTOC1-1f      ;       \
  38         .text                   ;       \
  39 1:      mflr    r12             ;       \
  40         lwz     r0,0b-1b(r12)   ;       \
  41         add     r12,r0,r12      ;
  42
  43 #define GOT_ENTRY(NAME)         .L_ ## NAME = . - .LCTOC1 ; .long NAME
  44
  45 #define GOT(NAME)               .L_ ## NAME (r12)
  46
  47
  48 /***************************************************************************
  49  * Register names
  50  */
  51 #define r0      0
  52 #define r1      1
  53 #define r2      2
  54 #define r3      3
  55 #define r4      4
  56 #define r5      5
  57 #define r6      6
  58 #define r7      7
  59 #define r8      8
  60 #define r9      9
  61 #define r10     10
  62 #define r11     11
  63 #define r12     12
  64 #define r13     13
  65 #define r14     14
  66 #define r15     15
  67 #define r16     16
  68 #define r17     17
  69 #define r18     18
  70 #define r19     19
  71 #define r20     20
  72 #define r21     21
  73 #define r22     22
  74 #define r23     23
  75 #define r24     24
  76 #define r25     25
  77 #define r26     26
  78 #define r27     27
  79 #define r28     28
  80 #define r29     29
  81 #define r30     30
  82 #define r31     31
  83
  84 #if defined(CONFIG_8xx)
  85
  86 /* Some special registers */
  87
  88 #define ICR     148     /* Interrupt Cause Register (37-44) */
  89 #define DER     149
  90 #define COUNTA  150     /* Breakpoint Counter       (37-44) */
  91 #define COUNTB  151     /* Breakpoint Counter       (37-44) */
  92 #define LCTRL1  156     /* Load/Store Support       (37-40) */
  93 #define LCTRL2  157     /* Load/Store Support       (37-41) */
  94 #define ICTRL   158
  95
  96 #endif  /* CONFIG_8xx */
  97
  98
  99 #if defined(CONFIG_8xx)
 100
 101 /* Registers in the processor's internal memory map that we use.
 102 */
 103 #define SYPCR   0x00000004
 104 #define BR0     0x00000100
 105 #define OR0     0x00000104
 106 #define BR1     0x00000108
 107 #define OR1     0x0000010c
 108 #define BR2     0x00000110
 109 #define OR2     0x00000114
 110 #define BR3     0x00000118
 111 #define OR3     0x0000011c
 112 #define BR4     0x00000120
 113 #define OR4     0x00000124
 114
 115 #define MAR     0x00000164
 116 #define MCR     0x00000168
 117 #define MAMR    0x00000170
 118 #define MBMR    0x00000174
 119 #define MSTAT   0x00000178
 120 #define MPTPR   0x0000017a
 121 #define MDR     0x0000017c
 122
 123 #define TBSCR   0x00000200
 124 #define TBREFF0 0x00000204
 125
 126 #define PLPRCR  0x00000284
 127
 128 #endif
 129
 130 #define curptr r2
 131
 132 #define SYNC \
 133         sync; \
 134         isync
 135
 136 /*
 137  * Macros for storing registers into and loading registers from
 138  * exception frames.
 139  */
 140 #define SAVE_GPR(n, base)       stw     n,GPR0+4*(n)(base)
 141 #define SAVE_2GPRS(n, base)     SAVE_GPR(n, base); SAVE_GPR(n+1, base)
 142 #define SAVE_4GPRS(n, base)     SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base)
 143 #define SAVE_8GPRS(n, base)     SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base)
 144 #define SAVE_10GPRS(n, base)    SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base)
 145 #define REST_GPR(n, base)       lwz     n,GPR0+4*(n)(base)
 146 #define REST_2GPRS(n, base)     REST_GPR(n, base); REST_GPR(n+1, base)
 147 #define REST_4GPRS(n, base)     REST_2GPRS(n, base); REST_2GPRS(n+2, base)
 148 #define REST_8GPRS(n, base)     REST_4GPRS(n, base); REST_4GPRS(n+4, base)
 149 #define REST_10GPRS(n, base)    REST_8GPRS(n, base); REST_2GPRS(n+8, base)
 150
 151 /*
 152  * GCC sometimes accesses words at negative offsets from the stack
 153  * pointer, although the SysV ABI says it shouldn't.  To cope with
 154  * this, we leave this much untouched space on the stack on exception
 155  * entry.
 156  */
 157 #define STACK_UNDERHEAD 64
 158
 159 /*
 160  * Exception entry code.  This code runs with address translation
 161  * turned off, i.e. using physical addresses.
 162  * We assume sprg3 has the physical address of the current
 163  * task's thread_struct.
 164  */
 165 #define EXCEPTION_PROLOG(reg1, reg2)    \
 166         mtspr   SPRG0,r20;      \
 167         mtspr   SPRG1,r21;      \
 168         mfcr    r20;            \
 169         subi    r21,r1,INT_FRAME_SIZE+STACK_UNDERHEAD;  /* alloc exc. frame */\
 170         stw     r20,_CCR(r21);          /* save registers */ \
 171         stw     r22,GPR22(r21); \
 172         stw     r23,GPR23(r21); \
 173         mfspr   r20,SPRG0;      \
 174         stw     r20,GPR20(r21); \
 175         mfspr   r22,SPRG1;      \
 176         stw     r22,GPR21(r21); \
 177         mflr    r20;            \
 178         stw     r20,_LINK(r21); \
 179         mfctr   r22;            \
 180         stw     r22,_CTR(r21);  \
 181         mfspr   r20,XER;        \
 182         stw     r20,_XER(r21);  \
 183         mfspr   r20, DAR_DEAR;  \
 184         stw     r20,_DAR(r21);  \
 185         mfspr   r22,reg1;       \
 186         mfspr   r23,reg2;       \
 187         stw     r0,GPR0(r21);   \
 188         stw     r1,GPR1(r21);   \
 189         stw     r2,GPR2(r21);   \
 190         stw     r1,0(r21);      \
 191         mr      r1,r21;                 /* set new kernel sp */ \
 192         SAVE_4GPRS(3, r21);
 193 /*
 194  * Note: code which follows this uses cr0.eq (set if from kernel),
 195  * r21, r22 (SRR0), and r23 (SRR1).
 196  */
 197
 198 /*
 199  * Exception vectors.
 200  *
 201  * The data words for `hdlr' and `int_return' are initialized with
 202  * OFFSET values only; they must be relocated first before they can
 203  * be used!
 204  */
 205 #define COPY_EE(d, s)           rlwimi d,s,0,16,16
 206 #define NOCOPY(d, s)
 207
 208 #ifdef CONFIG_E500
 209 #define EXC_XFER_TEMPLATE(n, label, hdlr, msr, copyee)  \
 210         stw     r22,_NIP(r21);                          \
 211         stw     r23,_MSR(r21);                          \
 212         li      r23,n;                                  \
 213         stw     r23,TRAP(r21);                          \
 214         li      r20,msr;                                \
 215         copyee(r20,r23);                                \
 216         rlwimi  r20,r23,0,25,25;                        \
 217         mtmsr   r20;                                    \
 218         bl      1f;                                     \
 219 1:      mflr    r23;                                    \
 220         addis   r23,r23,(hdlr - 1b)@ha;                 \
 221         addi    r23,r23,(hdlr - 1b)@l;                  \
 222         b       transfer_to_handler
 223
 224 #define STD_EXCEPTION(n, label, hdlr)                           \
 225 .align 4;                                                       \
 226 label:                                                          \
 227         EXCEPTION_PROLOG(SRR0, SRR1);                           \
 228         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 229         EXC_XFER_TEMPLATE(n, label, hdlr, MSR_KERNEL, NOCOPY)   \
 230
 231 #define CRIT_EXCEPTION(n, label, hdlr)                          \
 232 .align 4;                                                       \
 233 label:                                                          \
 234         EXCEPTION_PROLOG(CSRR0, CSRR1);                         \
 235         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 236         EXC_XFER_TEMPLATE(n, label, hdlr,                       \
 237         MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)           \
 238
 239 #define MCK_EXCEPTION(n, label, hdlr)                           \
 240 .align 4;                                                       \
 241 label:                                                          \
 242         EXCEPTION_PROLOG(MCSRR0, MCSRR1);                       \
 243         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 244         EXC_XFER_TEMPLATE(n, label, hdlr,                       \
 245         MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)           \
 246
 247 #else   /* !E500 */
 248
 249 #define EXC_XFER_TEMPLATE(label, hdlr, msr, copyee)     \
 250         bl      1f;                                     \
 251 1:      mflr    r20;                                    \
 252         lwz     r20,(.L_ ## label)-1b+8(r20);           \
 253         mtlr    r20;                                    \
 254         li      r20,msr;                                \
 255         copyee(r20,r23);                                \
 256         rlwimi  r20,r23,0,25,25;                        \
 257         blrl;                                           \
 258 .L_ ## label :                                          \
 259         .long   hdlr - _start + _START_OFFSET;          \
 260         .long   int_return - _start + _START_OFFSET;    \
 261         .long   transfer_to_handler - _start + _START_OFFSET
 262
 263 #define STD_EXCEPTION(n, label, hdlr)                           \
 264         . = n;                                                  \
 265 label:                                                          \
 266         EXCEPTION_PROLOG(SRR0, SRR1);                           \
 267         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 268         EXC_XFER_TEMPLATE(label, hdlr, MSR_KERNEL, NOCOPY)      \
 269
 270 #define CRIT_EXCEPTION(n, label, hdlr)                          \
 271         . = n;                                                  \
 272 label:                                                          \
 273         EXCEPTION_PROLOG(CSRR0, CSRR1);                         \
 274         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 275         EXC_XFER_TEMPLATE(label, hdlr,                          \
 276         MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)           \
 277
 278 #define MCK_EXCEPTION(n, label, hdlr)                           \
 279         . = n;                                                  \
 280 label:                                                          \
 281         EXCEPTION_PROLOG(MCSRR0, MCSRR1);                       \
 282         addi    r3,r1,STACK_FRAME_OVERHEAD;                     \
 283         EXC_XFER_TEMPLATE(label, hdlr,                          \
 284         MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY)           \
 285
 286 #endif  /* !E500 */
 287 #endif  /* __PPC_ASM_TMPL__ */