/* $OpenBSD: frame.h,v 1.14 2022/12/08 01:25:44 guenther Exp $ */ /* $NetBSD: frame.h,v 1.9 2003/12/01 08:48:33 scw Exp $ */ /* * Copyright (c) 1994-1997 Mark Brinicombe. * Copyright (c) 1994 Brini. * All rights reserved. * * This code is derived from software written for Brini by Mark Brinicombe * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Brini. * 4. The name of the company nor the name of the author may be used to * endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * RiscBSD kernel project * * frame.h * * Stack frames structures * * Created : 30/09/94 */ #ifndef _ARM_FRAME_H_ #define _ARM_FRAME_H_ #ifndef _LOCORE #include <sys/signal.h> /* * Trap frame. Pushed onto the kernel stack on a trap (synchronous exception). */ typedef struct trapframe { register_t tf_spsr; register_t tf_r0; register_t tf_r1; register_t tf_r2; register_t tf_r3; register_t tf_r4; register_t tf_r5; register_t tf_r6; register_t tf_r7; register_t tf_r8; register_t tf_r9; register_t tf_r10; register_t tf_r11; register_t tf_r12; register_t tf_usr_sp; register_t tf_usr_lr; register_t tf_svc_sp; register_t tf_svc_lr; register_t tf_pc; register_t tf_pad; } trapframe_t; /* Register numbers */ #define tf_r13 tf_usr_sp #define tf_r14 tf_usr_lr #define tf_r15 tf_pc /* Determine if a fault came from user mode */ #define TRAP_USERMODE(tf) ((tf->tf_spsr & PSR_MODE) == PSR_USR32_MODE) /* * Signal frame. Pushed onto user stack before calling sigcode. */ struct sigframe { int sf_signum; siginfo_t *sf_sip; struct sigcontext *sf_scp; sig_t sf_handler; struct sigcontext sf_sc; siginfo_t sf_si; }; /* the pointers are used in the trampoline code to locate the ucontext */ #if 0 struct sigframe_siginfo { siginfo_t sf_si; /* actual saved siginfo */ ucontext_t sf_uc; /* actual saved ucontext */ }; #endif #if 0 #ifdef _KERNEL void sendsig_sigcontext(const ksiginfo_t *, const sigset_t *); #endif #endif #endif /* _LOCORE */ #ifndef _LOCORE /* * System stack frames. */ typedef struct irqframe { unsigned int if_spsr; unsigned int if_r0; unsigned int if_r1; unsigned int if_r2; unsigned int if_r3; unsigned int if_r4; unsigned int if_r5; unsigned int if_r6; unsigned int if_r7; unsigned int if_r8; unsigned int if_r9; unsigned int if_r10; unsigned int if_r11; unsigned int if_r12; unsigned int if_usr_sp; unsigned int if_usr_lr; unsigned int if_svc_sp; unsigned int if_svc_lr; unsigned int if_pc; unsigned int if_pad; } irqframe_t; #define clockframe irqframe /* * Switch frame */ struct switchframe { u_int sf_pad; u_int sf_r4; u_int sf_r5; u_int sf_r6; u_int sf_r7; u_int sf_pc; }; /* * Stack frame. Used during stack traces (db_trace.c) */ struct frame { u_int fr_fp; u_int fr_sp; u_int fr_lr; u_int fr_pc; }; #else /* _LOCORE */ #define AST_LOCALS \ .Laflt_astpending: ;\ .word astpending #define DO_AST \ ldr r0, [sp] /* Get the SPSR from stack */ ;\ mrs r4, cpsr /* save CPSR */ ;\ and r0, r0, #(PSR_MODE) /* Returning to USR mode? */ ;\ teq r0, #(PSR_USR32_MODE) ;\ ldreq r5, .Laflt_astpending ;\ bne 2f /* Nope, get out now */ ;\ bic r4, r4, #(PSR_I) ;\ 1: orr r0, r4, #(PSR_I) /* Disable IRQs */ ;\ msr cpsr_c, r0 ;\ ldr r1, [r5] /* Pending AST? */ ;\ teq r1, #0x00000000 ;\ beq 2f /* Nope. Just bail */ ;\ mov r1, #0x00000000 ;\ str r1, [r5] /* Clear astpending */ ;\ msr cpsr_c, r4 /* Restore interrupts */ ;\ mov r0, sp ;\ adr lr, 1b ;\ b ast /* ast(frame) */ ;\ 2: /* * ASM macros for pushing and pulling trapframes from the stack * * These macros are used to handle the irqframe and trapframe structures * defined above. */ /* * CLREX - On ARMv7 machines that support atomic instructions, we need * to clear the exclusive monitors on kernel exit, so that a userland * atomic store can't succeed due to an unrelated outstanding atomic * operation. ARM also highly recommends clearing the monitor on data * aborts, as the monitor state after taking a data abort is unknown. * Issuing a clrex on kernel entry and on kernel exit is the easiest * way to take care of both issues and to make sure that the kernel * and userland do not leave any outstanding reserves active. */ /* * PUSHFRAME - macro to push a trap frame on the stack in the current mode * Since the current mode is used, the SVC lr field is not defined. */ #define PUSHFRAME \ clrex; \ sub sp, sp, #4; /* Align the stack */ \ str lr, [sp, #-4]!; /* Push the return address */ \ sub sp, sp, #(4*17); /* Adjust the stack pointer */ \ stmia sp, {r0-r14}^; /* Push the user mode registers */ \ mov r0, r0; /* NOP for previous instruction */ \ mrs r0, spsr; /* Put the SPSR on the stack */ \ str r0, [sp, #-4]! /* * PULLFRAME - macro to pull a trap frame from the stack in the current mode * Since the current mode is used, the SVC lr field is ignored. */ #define PULLFRAME \ clrex; \ ldr r0, [sp], #0x0004; /* Get the SPSR from stack */ \ msr spsr_fsxc, r0; \ ldmia sp, {r0-r14}^; /* Restore registers (usr mode) */ \ mov r0, r0; /* NOP for previous instruction */ \ add sp, sp, #(4*17); /* Adjust the stack pointer */ \ ldr lr, [sp], #0x0004; /* Pull the return address */ \ add sp, sp, #4 /* Align the stack */ /* * PUSHFRAMEINSVC - macro to push a trap frame on the stack in SVC32 mode * This should only be used if the processor is not currently in SVC32 * mode. The processor mode is switched to SVC mode and the trap frame is * stored. The SVC lr field is used to store the previous value of * lr in SVC mode. */ #define PUSHFRAMEINSVC \ clrex; \ stmdb sp, {r0-r3}; /* Save 4 registers */ \ mov r0, lr; /* Save xxx32 r14 */ \ mov r1, sp; /* Save xxx32 sp */ \ mrs r3, spsr; /* Save xxx32 spsr */ \ mrs r2, cpsr; /* Get the CPSR */ \ bic r2, r2, #(PSR_MODE); /* Fix for SVC mode */ \ orr r2, r2, #(PSR_SVC32_MODE); \ msr cpsr_c, r2; /* Punch into SVC mode */ \ mov r2, sp; /* Save SVC sp */ \ bic sp, sp, #7; /* Align sp to an 8-byte address */ \ sub sp, sp, #4; /* Pad trapframe to keep alignment */ \ str r0, [sp, #-4]!; /* Push return address */ \ str lr, [sp, #-4]!; /* Push SVC lr */ \ str r2, [sp, #-4]!; /* Push SVC sp */ \ msr spsr_fsxc, r3; /* Restore correct spsr */ \ ldmdb r1, {r0-r3}; /* Restore 4 regs from xxx mode */ \ sub sp, sp, #(4*15); /* Adjust the stack pointer */ \ stmia sp, {r0-r14}^; /* Push the user mode registers */ \ mov r0, r0; /* NOP for previous instruction */ \ mrs r0, spsr; /* Put the SPSR on the stack */ \ str r0, [sp, #-4]! /* * PULLFRAMEFROMSVCANDEXIT - macro to pull a trap frame from the stack * in SVC32 mode and restore the saved processor mode and PC. * This should be used when the SVC lr register needs to be restored on * exit. */ #define PULLFRAMEFROMSVCANDEXIT \ clrex; \ ldr r0, [sp], #0x0004; /* Get the SPSR from stack */ \ msr spsr_fsxc, r0; /* restore SPSR */ \ ldmia sp, {r0-r14}^; /* Restore registers (usr mode) */ \ mov r0, r0; /* NOP for previous instruction */ \ add sp, sp, #(4*15); /* Adjust the stack pointer */ \ ldmia sp, {sp, lr, pc}^ /* Restore lr and exit */ #endif /* _LOCORE */ #endif /* _ARM_FRAME_H_ */
