1 /* $OpenBSD: frame.h,v 1.4 2011/09/20 22:02:13 miod Exp $ */ 2 /* $NetBSD: frame.h,v 1.9 2003/12/01 08:48:33 scw Exp $ */ 3 4 /* 5 * Copyright (c) 1994-1997 Mark Brinicombe. 6 * Copyright (c) 1994 Brini. 7 * All rights reserved. 8 * 9 * This code is derived from software written for Brini by Mark Brinicombe 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by Brini. 22 * 4. The name of the company nor the name of the author may be used to 23 * endorse or promote products derived from this software without specific 24 * prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED 27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 30 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 31 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * RiscBSD kernel project 39 * 40 * frame.h 41 * 42 * Stack frames structures 43 * 44 * Created : 30/09/94 45 */ 46 47 #ifndef _ARM_FRAME_H_ 48 #define _ARM_FRAME_H_ 49 50 #ifndef _LOCORE 51 52 #include <sys/signal.h> 53 54 /* 55 * Trap frame. Pushed onto the kernel stack on a trap (synchronous exception). 56 */ 57 58 typedef struct trapframe { 59 register_t tf_spsr; 60 register_t tf_r0; 61 register_t tf_r1; 62 register_t tf_r2; 63 register_t tf_r3; 64 register_t tf_r4; 65 register_t tf_r5; 66 register_t tf_r6; 67 register_t tf_r7; 68 register_t tf_r8; 69 register_t tf_r9; 70 register_t tf_r10; 71 register_t tf_r11; 72 register_t tf_r12; 73 register_t tf_usr_sp; 74 register_t tf_usr_lr; 75 register_t tf_svc_sp; 76 register_t tf_svc_lr; 77 register_t tf_pc; 78 } trapframe_t; 79 80 /* Register numbers */ 81 #define tf_r13 tf_usr_sp 82 #define tf_r14 tf_usr_lr 83 #define tf_r15 tf_pc 84 85 /* 86 * Signal frame. Pushed onto user stack before calling sigcode. 87 */ 88 89 struct sigframe { 90 int sf_signum; 91 siginfo_t *sf_sip; 92 struct sigcontext *sf_scp; 93 sig_t sf_handler; 94 struct sigcontext sf_sc; 95 siginfo_t sf_si; 96 }; 97 98 /* the pointers are used in the trampoline code to locate the ucontext */ 99 #if 0 100 struct sigframe_siginfo { 101 siginfo_t sf_si; /* actual saved siginfo */ 102 ucontext_t sf_uc; /* actual saved ucontext */ 103 }; 104 #endif 105 106 #if 0 107 #ifdef _KERNEL 108 void sendsig_sigcontext(const ksiginfo_t *, const sigset_t *); 109 #endif 110 #endif 111 112 #endif /* _LOCORE */ 113 114 #ifndef _LOCORE 115 116 /* 117 * System stack frames. 118 */ 119 120 typedef struct irqframe { 121 unsigned int if_spsr; 122 unsigned int if_r0; 123 unsigned int if_r1; 124 unsigned int if_r2; 125 unsigned int if_r3; 126 unsigned int if_r4; 127 unsigned int if_r5; 128 unsigned int if_r6; 129 unsigned int if_r7; 130 unsigned int if_r8; 131 unsigned int if_r9; 132 unsigned int if_r10; 133 unsigned int if_r11; 134 unsigned int if_r12; 135 unsigned int if_usr_sp; 136 unsigned int if_usr_lr; 137 unsigned int if_svc_sp; 138 unsigned int if_svc_lr; 139 unsigned int if_pc; 140 } irqframe_t; 141 142 #define clockframe irqframe 143 144 /* 145 * Switch frame 146 */ 147 148 struct switchframe { 149 u_int sf_r4; 150 u_int sf_r5; 151 u_int sf_r6; 152 u_int sf_r7; 153 u_int sf_pc; 154 }; 155 156 /* 157 * Stack frame. Used during stack traces (db_trace.c) 158 */ 159 struct frame { 160 u_int fr_fp; 161 u_int fr_sp; 162 u_int fr_lr; 163 u_int fr_pc; 164 }; 165 166 #else /* _LOCORE */ 167 168 #define AST_LOCALS \ 169 .Laflt_astpending: ;\ 170 .word _C_LABEL(astpending) 171 172 #define DO_AST \ 173 ldr r0, [sp] /* Get the SPSR from stack */ ;\ 174 mrs r4, cpsr /* save CPSR */ ;\ 175 and r0, r0, #(PSR_MODE) /* Returning to USR mode? */ ;\ 176 teq r0, #(PSR_USR32_MODE) ;\ 177 ldreq r5, .Laflt_astpending ;\ 178 bne 2f /* Nope, get out now */ ;\ 179 bic r4, r4, #(I32_bit) ;\ 180 1: orr r0, r4, #(I32_bit) /* Disable IRQs */ ;\ 181 msr cpsr_c, r0 ;\ 182 ldr r1, [r5] /* Pending AST? */ ;\ 183 teq r1, #0x00000000 ;\ 184 beq 2f /* Nope. Just bail */ ;\ 185 mov r1, #0x00000000 ;\ 186 str r1, [r5] /* Clear astpending */ ;\ 187 msr cpsr_c, r4 /* Restore interrupts */ ;\ 188 mov r0, sp ;\ 189 adr lr, 1b ;\ 190 b _C_LABEL(ast) /* ast(frame) */ ;\ 191 2: 192 193 /* 194 * ASM macros for pushing and pulling trapframes from the stack 195 * 196 * These macros are used to handle the irqframe and trapframe structures 197 * defined above. 198 */ 199 200 /* 201 * PUSHFRAME - macro to push a trap frame on the stack in the current mode 202 * Since the current mode is used, the SVC lr field is not defined. 203 */ 204 205 #define PUSHFRAME \ 206 str lr, [sp, #-4]!; /* Push the return address */ \ 207 sub sp, sp, #(4*17); /* Adjust the stack pointer */ \ 208 stmia sp, {r0-r14}^; /* Push the user mode registers */ \ 209 mov r0, r0; /* NOP for previous instruction */ \ 210 mrs r0, spsr_all; /* Put the SPSR on the stack */ \ 211 str r0, [sp, #-4]! 212 213 /* 214 * PULLFRAME - macro to pull a trap frame from the stack in the current mode 215 * Since the current mode is used, the SVC lr field is ignored. 216 */ 217 218 #define PULLFRAME \ 219 ldr r0, [sp], #0x0004; /* Get the SPSR from stack */ \ 220 msr spsr_all, r0; \ 221 ldmia sp, {r0-r14}^; /* Restore registers (usr mode) */ \ 222 mov r0, r0; /* NOP for previous instruction */ \ 223 add sp, sp, #(4*17); /* Adjust the stack pointer */ \ 224 ldr lr, [sp], #0x0004 /* Pull the return address */ 225 226 /* 227 * PUSHFRAMEINSVC - macro to push a trap frame on the stack in SVC32 mode 228 * This should only be used if the processor is not currently in SVC32 229 * mode. The processor mode is switched to SVC mode and the trap frame is 230 * stored. The SVC lr field is used to store the previous value of 231 * lr in SVC mode. 232 */ 233 234 #define PUSHFRAMEINSVC \ 235 stmdb sp, {r0-r3}; /* Save 4 registers */ \ 236 mov r0, lr; /* Save xxx32 r14 */ \ 237 mov r1, sp; /* Save xxx32 sp */ \ 238 mrs r3, spsr; /* Save xxx32 spsr */ \ 239 mrs r2, cpsr; /* Get the CPSR */ \ 240 bic r2, r2, #(PSR_MODE); /* Fix for SVC mode */ \ 241 orr r2, r2, #(PSR_SVC32_MODE); \ 242 msr cpsr_c, r2; /* Punch into SVC mode */ \ 243 mov r2, sp; /* Save SVC sp */ \ 244 str r0, [sp, #-4]!; /* Push return address */ \ 245 str lr, [sp, #-4]!; /* Push SVC lr */ \ 246 str r2, [sp, #-4]!; /* Push SVC sp */ \ 247 msr spsr_all, r3; /* Restore correct spsr */ \ 248 ldmdb r1, {r0-r3}; /* Restore 4 regs from xxx mode */ \ 249 sub sp, sp, #(4*15); /* Adjust the stack pointer */ \ 250 stmia sp, {r0-r14}^; /* Push the user mode registers */ \ 251 mov r0, r0; /* NOP for previous instruction */ \ 252 mrs r0, spsr_all; /* Put the SPSR on the stack */ \ 253 str r0, [sp, #-4]! 254 255 /* 256 * PULLFRAMEFROMSVCANDEXIT - macro to pull a trap frame from the stack 257 * in SVC32 mode and restore the saved processor mode and PC. 258 * This should be used when the SVC lr register needs to be restored on 259 * exit. 260 */ 261 262 #define PULLFRAMEFROMSVCANDEXIT \ 263 ldr r0, [sp], #0x0004; /* Get the SPSR from stack */ \ 264 msr spsr_all, r0; /* restore SPSR */ \ 265 ldmia sp, {r0-r14}^; /* Restore registers (usr mode) */ \ 266 mov r0, r0; /* NOP for previous instruction */ \ 267 add sp, sp, #(4*15); /* Adjust the stack pointer */ \ 268 ldmia sp, {sp, lr, pc}^ /* Restore lr and exit */ 269 270 #endif /* _LOCORE */ 271 272 #endif /* _ARM_FRAME_H_ */ 273 274 /* End of frame.h */ 275