1 /* $NetBSD: frame.h,v 1.6 2003/10/05 19:44:58 matt Exp $ */ 2 3 /*- 4 * Copyright (c) 1994-1997 Mark Brinicombe. 5 * Copyright (c) 1994 Brini. 6 * All rights reserved. 7 * 8 * This code is derived from software written for Brini by Mark Brinicombe 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Brini. 21 * 4. The name of the company nor the name of the author may be used to 22 * endorse or promote products derived from this software without specific 23 * prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 29 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 30 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * $FreeBSD$ 38 */ 39 40 #ifndef _MACHINE_ASMACROS_H_ 41 #define _MACHINE_ASMACROS_H_ 42 43 #include <machine/asm.h> 44 45 #ifdef _KERNEL 46 47 #ifdef LOCORE 48 #include "opt_global.h" 49 50 /* 51 * ASM macros for pushing and pulling trapframes from the stack 52 * 53 * These macros are used to handle the irqframe and trapframe structures 54 * defined above. 55 */ 56 57 /* 58 * PUSHFRAME - macro to push a trap frame on the stack in the current mode 59 * Since the current mode is used, the SVC lr field is not defined. 60 * 61 * NOTE: r13 and r14 are stored separately as a work around for the 62 * SA110 rev 2 STM^ bug 63 */ 64 #ifdef ARM_TP_ADDRESS 65 #define PUSHFRAME \ 66 str lr, [sp, #-4]!; /* Push the return address */ \ 67 sub sp, sp, #(4*17); /* Adjust the stack pointer */ \ 68 stmia sp, {r0-r12}; /* Push the user mode registers */ \ 69 add r0, sp, #(4*13); /* Adjust the stack pointer */ \ 70 stmia r0, {r13-r14}^; /* Push the user mode registers */ \ 71 mov r0, r0; /* NOP for previous instruction */ \ 72 mrs r0, spsr_all; /* Put the SPSR on the stack */ \ 73 str r0, [sp, #-4]!; \ 74 ldr r0, =ARM_RAS_START; \ 75 mov r1, #0; \ 76 str r1, [r0]; \ 77 mov r1, #0xffffffff; \ 78 str r1, [r0, #4]; 79 #else 80 #define PUSHFRAME \ 81 str lr, [sp, #-4]!; /* Push the return address */ \ 82 sub sp, sp, #(4*17); /* Adjust the stack pointer */ \ 83 stmia sp, {r0-r12}; /* Push the user mode registers */ \ 84 add r0, sp, #(4*13); /* Adjust the stack pointer */ \ 85 stmia r0, {r13-r14}^; /* Push the user mode registers */ \ 86 mov r0, r0; /* NOP for previous instruction */ \ 87 mrs r0, spsr_all; /* Put the SPSR on the stack */ \ 88 str r0, [sp, #-4]!; 89 #endif 90 91 /* 92 * PULLFRAME - macro to pull a trap frame from the stack in the current mode 93 * Since the current mode is used, the SVC lr field is ignored. 94 */ 95 96 #ifdef ARM_TP_ADDRESS 97 #define PULLFRAME \ 98 ldr r0, [sp], #0x0004; /* Get the SPSR from stack */ \ 99 msr spsr_all, r0; \ 100 ldmia sp, {r0-r14}^; /* Restore registers (usr mode) */ \ 101 mov r0, r0; /* NOP for previous instruction */ \ 102 add sp, sp, #(4*17); /* Adjust the stack pointer */ \ 103 ldr lr, [sp], #0x0004; /* Pull the return address */ 104 #else 105 #define PULLFRAME \ 106 ldr r0, [sp], #0x0004; /* Get the SPSR from stack */ \ 107 msr spsr_all, r0; \ 108 clrex; \ 109 ldmia sp, {r0-r14}^; /* Restore registers (usr mode) */ \ 110 mov r0, r0; /* NOP for previous instruction */ \ 111 add sp, sp, #(4*17); /* Adjust the stack pointer */ \ 112 ldr lr, [sp], #0x0004; /* Pull the return address */ 113 #endif 114 115 /* 116 * PUSHFRAMEINSVC - macro to push a trap frame on the stack in SVC32 mode 117 * This should only be used if the processor is not currently in SVC32 118 * mode. The processor mode is switched to SVC mode and the trap frame is 119 * stored. The SVC lr field is used to store the previous value of 120 * lr in SVC mode. 121 * 122 * NOTE: r13 and r14 are stored separately as a work around for the 123 * SA110 rev 2 STM^ bug 124 */ 125 #ifdef ARM_TP_ADDRESS 126 #define PUSHFRAMEINSVC \ 127 stmdb sp, {r0-r3}; /* Save 4 registers */ \ 128 mov r0, lr; /* Save xxx32 r14 */ \ 129 mov r1, sp; /* Save xxx32 sp */ \ 130 mrs r3, spsr; /* Save xxx32 spsr */ \ 131 mrs r2, cpsr; /* Get the CPSR */ \ 132 bic r2, r2, #(PSR_MODE); /* Fix for SVC mode */ \ 133 orr r2, r2, #(PSR_SVC32_MODE); \ 134 msr cpsr_c, r2; /* Punch into SVC mode */ \ 135 mov r2, sp; /* Save SVC sp */ \ 136 str r0, [sp, #-4]!; /* Push return address */ \ 137 str lr, [sp, #-4]!; /* Push SVC lr */ \ 138 str r2, [sp, #-4]!; /* Push SVC sp */ \ 139 msr spsr_all, r3; /* Restore correct spsr */ \ 140 ldmdb r1, {r0-r3}; /* Restore 4 regs from xxx mode */ \ 141 sub sp, sp, #(4*15); /* Adjust the stack pointer */ \ 142 stmia sp, {r0-r12}; /* Push the user mode registers */ \ 143 add r0, sp, #(4*13); /* Adjust the stack pointer */ \ 144 stmia r0, {r13-r14}^; /* Push the user mode registers */ \ 145 mov r0, r0; /* NOP for previous instruction */ \ 146 ldr r5, =ARM_RAS_START; /* Check if there's any RAS */ \ 147 ldr r4, [r5, #4]; /* reset it to point at the */ \ 148 cmp r4, #0xffffffff; /* end of memory if necessary; */ \ 149 movne r1, #0xffffffff; /* leave value in r4 for later */ \ 150 strne r1, [r5, #4]; /* comparision against PC. */ \ 151 ldr r3, [r5]; /* Retrieve global RAS_START */ \ 152 cmp r3, #0; /* and reset it if non-zero. */ \ 153 movne r1, #0; /* If non-zero RAS_START and */ \ 154 strne r1, [r5]; /* PC was lower than RAS_END, */ \ 155 ldrne r1, [r0, #16]; /* adjust the saved PC so that */ \ 156 cmpne r4, r1; /* execution later resumes at */ \ 157 strhi r3, [r0, #16]; /* the RAS_START location. */ \ 158 mrs r0, spsr_all; \ 159 str r0, [sp, #-4]! 160 #else 161 #define PUSHFRAMEINSVC \ 162 stmdb sp, {r0-r3}; /* Save 4 registers */ \ 163 mov r0, lr; /* Save xxx32 r14 */ \ 164 mov r1, sp; /* Save xxx32 sp */ \ 165 mrs r3, spsr; /* Save xxx32 spsr */ \ 166 mrs r2, cpsr; /* Get the CPSR */ \ 167 bic r2, r2, #(PSR_MODE); /* Fix for SVC mode */ \ 168 orr r2, r2, #(PSR_SVC32_MODE); \ 169 msr cpsr_c, r2; /* Punch into SVC mode */ \ 170 mov r2, sp; /* Save SVC sp */ \ 171 str r0, [sp, #-4]!; /* Push return address */ \ 172 str lr, [sp, #-4]!; /* Push SVC lr */ \ 173 str r2, [sp, #-4]!; /* Push SVC sp */ \ 174 msr spsr_all, r3; /* Restore correct spsr */ \ 175 ldmdb r1, {r0-r3}; /* Restore 4 regs from xxx mode */ \ 176 sub sp, sp, #(4*15); /* Adjust the stack pointer */ \ 177 stmia sp, {r0-r12}; /* Push the user mode registers */ \ 178 add r0, sp, #(4*13); /* Adjust the stack pointer */ \ 179 stmia r0, {r13-r14}^; /* Push the user mode registers */ \ 180 mov r0, r0; /* NOP for previous instruction */ \ 181 mrs r0, spsr_all; /* Put the SPSR on the stack */ \ 182 str r0, [sp, #-4]! 183 #endif 184 185 /* 186 * PULLFRAMEFROMSVCANDEXIT - macro to pull a trap frame from the stack 187 * in SVC32 mode and restore the saved processor mode and PC. 188 * This should be used when the SVC lr register needs to be restored on 189 * exit. 190 */ 191 192 #ifdef ARM_TP_ADDRESS 193 #define PULLFRAMEFROMSVCANDEXIT \ 194 ldr r0, [sp], #0x0004; /* Get the SPSR from stack */ \ 195 msr spsr_all, r0; /* restore SPSR */ \ 196 ldmia sp, {r0-r14}^; /* Restore registers (usr mode) */ \ 197 mov r0, r0; /* NOP for previous instruction */ \ 198 add sp, sp, #(4*15); /* Adjust the stack pointer */ \ 199 ldmia sp, {sp, lr, pc}^ /* Restore lr and exit */ 200 #else 201 #define PULLFRAMEFROMSVCANDEXIT \ 202 ldr r0, [sp], #0x0004; /* Get the SPSR from stack */ \ 203 msr spsr_all, r0; /* restore SPSR */ \ 204 clrex; \ 205 ldmia sp, {r0-r14}^; /* Restore registers (usr mode) */ \ 206 mov r0, r0; /* NOP for previous instruction */ \ 207 add sp, sp, #(4*15); /* Adjust the stack pointer */ \ 208 ldmia sp, {sp, lr, pc}^ /* Restore lr and exit */ 209 #endif 210 #if defined(__ARM_EABI__) 211 #define UNWINDSVCFRAME \ 212 .save {r13-r15}; /* Restore sp, lr, pc */ \ 213 .pad #(2*4); /* Skip user sp and lr */ \ 214 .save {r0-r12}; /* Restore r0-r12 */ \ 215 .pad #(4) /* Skip spsr */ 216 #else 217 #define UNWINDSVCFRAME 218 #endif 219 220 #define DATA(name) \ 221 .data ; \ 222 _ALIGN_DATA ; \ 223 .globl name ; \ 224 .type name, %object ; \ 225 name: 226 227 #ifdef _ARM_ARCH_6 228 #define AST_LOCALS 229 #define GET_CURTHREAD_PTR(tmp) \ 230 mrc p15, 0, tmp, c13, c0, 4; \ 231 add tmp, tmp, #(PC_CURTHREAD) 232 #else 233 #define AST_LOCALS ;\ 234 .Lcurthread: ;\ 235 .word _C_LABEL(__pcpu) + PC_CURTHREAD 236 237 #define GET_CURTHREAD_PTR(tmp) \ 238 ldr tmp, .Lcurthread 239 #endif 240 241 #define DO_AST \ 242 ldr r0, [sp] /* Get the SPSR from stack */ ;\ 243 mrs r4, cpsr /* save CPSR */ ;\ 244 orr r1, r4, #(I32_bit|F32_bit) ;\ 245 msr cpsr_c, r1 /* Disable interrupts */ ;\ 246 and r0, r0, #(PSR_MODE) /* Returning to USR mode? */ ;\ 247 teq r0, #(PSR_USR32_MODE) ;\ 248 bne 2f /* Nope, get out now */ ;\ 249 bic r4, r4, #(I32_bit|F32_bit) ;\ 250 1: GET_CURTHREAD_PTR(r5) ;\ 251 ldr r5, [r5] ;\ 252 ldr r1, [r5, #(TD_FLAGS)] ;\ 253 and r1, r1, #(TDF_ASTPENDING|TDF_NEEDRESCHED) ;\ 254 teq r1, #0x00000000 ;\ 255 beq 2f /* Nope. Just bail */ ;\ 256 msr cpsr_c, r4 /* Restore interrupts */ ;\ 257 mov r0, sp ;\ 258 bl _C_LABEL(ast) /* ast(frame) */ ;\ 259 orr r0, r4, #(I32_bit|F32_bit) ;\ 260 msr cpsr_c, r0 ;\ 261 b 1b ;\ 262 2: 263 264 #endif /* LOCORE */ 265 266 #endif /* _KERNEL */ 267 268 #endif /* !_MACHINE_ASMACROS_H_ */ 269