/* $NetBSD: armfpe_glue.S,v 1.11 1997/10/14 07:56:48 mark Exp $ */ /* * Copyright (c) 1996 Mark Brinicombe * All rights reserved. * * 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 Mark Brinicombe. * 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 THE AUTHOR ``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 THE AUTHOR 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 * * arm_fpe_glue.S * * Glue code for calling the ARM FPE core code * * Created : 21/12/95 */ #define CHECK_BEFORE_USERRET #include "assym.h" #include #include ip .req r12 sp .req r13 lr .req r14 pc .req r15 .text .align 0 /* * Glue for calling the core entry points */ ENTRY(arm_fpe_core_disable) stmfd sp!, {r0-r7, lr} bl _fpe_arm_core_disable ldmfd sp!, {r0-r7, pc} ENTRY(arm_fpe_core_enable) stmfd sp!, {r0-r7, lr} bl _fpe_arm_core_enable ldmfd sp!, {r0-r7, pc} ENTRY(arm_fpe_core_initws) stmfd sp!, {r10, lr} mov r10, r0 bl _fpe_arm_core_initws ldmfd sp!, {r10, pc} ENTRY(arm_fpe_core_abort) stmfd sp!, {r1-r7, r10, lr} mov r10, r0 mov r0, r1 mov r1, r2 bl _fpe_arm_core_abort ldmfd sp!, {r1-r7, r10, pc} /* Only needs to preserve r10 */ ENTRY(arm_fpe_core_initcontext) stmfd sp!, {r0-r7, r10, lr} mov r10, r0 bl _fpe_arm_core_initcontext ldmfd sp!, {r0-r7, r10, pc} /* Only needs to preserve r10 */ ENTRY(arm_fpe_core_changecontext) stmfd sp!, {r1-r7, r10, lr} mov r10, r0 bl _fpe_arm_core_changecontext ldmfd sp!, {r1-r7, r10, pc} /* All regs preerved */ ENTRY(arm_fpe_core_shutdown) stmfd sp!, {r0-r7, r10, lr} bl _fpe_arm_core_shutdown ldmfd sp!, {r0-r7, r10, pc} /* Preserve r10 */ ENTRY(arm_fpe_core_savecontext) stmfd sp!, {r1-r7, r10, lr} mov r10, r0 mov r0, r1 mov r1, r2 bl _fpe_arm_core_savecontext ldmfd sp!, {r1-r7, r10, pc} /* Preserve r10 */ ENTRY(arm_fpe_core_loadcontext) stmfd sp!, {r0-r7, r10, lr} mov r10, r0 mov r0, r1 bl _fpe_arm_core_loadcontext ldmfd sp!, {r0-r7, r10, pc} /* Only needs to preserve r10 */ ENTRY(arm_fpe_core_activatecontext) stmfd sp!, {r0-r7, r10, lr} mov r10, r0 bl _fpe_arm_core_activatecontext ldmfd sp!, {r0-r7, r10, pc} /* Only needs to preserve r10 */ ENTRY(arm_fpe_core_deactivatecontext) stmfd sp!, {r1-r7, r10, lr} bl _fpe_arm_core_deactivatecontext ldmfd sp!, {r1-r7, r10, pc} /* * Call back functions from the core */ .global _arm_fpe_newhandler _arm_fpe_newhandler: stmfd sp!, {r0, lr} ldr r0, Llocal_handler_addr str r1, [r0] ldmfd sp!, {r0, pc} Llocal_handler_addr: .word _undefined_handler_address .global _arm_fpe_restorehandler _arm_fpe_restorehandler: stmfd sp!, {r0-r1, lr} ldr r0, Llocal_handler_addr ldr r1, Lold_handler_addr ldr r1, [r1] str r1, [r0] ldmfd sp!, {r0-r1, pc} Lold_handler_addr: .word _arm_fpe_old_handler_address .text .global _arm_fpe_handle_exception _arm_fpe_handle_exception: b _arm_fpe_exception_glue .global _arm_fpe_get_ws _arm_fpe_get_ws: sub sp, sp, #8 str r0, [sp] ldr r0, Larm_fpe_core_workspace ldr r0, [r0] str r0, [sp, #4] ldr r0, [sp], #4 mov pc, lr Larm_fpe_core_workspace: .word _arm_fpe_core_workspace .global _arm_fpe_post_proc _arm_fpe_post_proc: b _arm_fpe_post_proc_glue /* Simple call back function that panics */ .global _arm_fpe_panic _arm_fpe_panic: adr r0, fpe_panic_text b _panic fpe_panic_text: .asciz "armfpe: we are panicing" .align 0 /* * Call back routine from FPE on completion of an instruction */ #ifdef CHECK_BEFORE_USERRET .global _userret_count0 .global _userret_count1 .data _userret_count0: .word 0 _userret_count1: .word 0 .text Luserret_count0: .word _userret_count0 Luserret_count1: .word _userret_count1 Lwant_resched: .word _want_resched Lcurproc: .word _curproc Lcurpriority: .word _curpriority #endif ENTRY(arm_fpe_post_proc_glue) stmfd sp!, {r0-r3, lr} #ifdef CHECK_BEFORE_USERRET /* Call userret if we need a reschedule */ /* Debugging */ ldr r0, Luserret_count0 ldr r1, [r0] add r1, r1, #1 str r1, [r0] /* Do we need a reschedule */ ldr r0, Lwant_resched ldr r0, [r0] teq r0, #0x00000000 bne Lwe_need_userret /* All other userret requirement conditions come from curproc */ ldr r0, Lcurproc ldr r0, [r0] /* Remember the flags field */ ldr r3, [r0, #(P_FLAG)] /* Get the signal list */ ldr r1, [r0, #(P_SIGLIST)] teq r1, #0x00000000 beq Lno_signals_pending tst r3, #(P_TRACED) bne Lwe_need_userret ldr r1, [r0, #(P_SIGLIST)] ldr r2, [r0, #(P_SIGMASK)] bic r1, r1, r2 teq r1, #0x00000000 bne Lwe_need_userret Lno_signals_pending: /* Are we profiling ? */ tst r3, #(P_PROFIL) bne Lwe_need_userret /* Update the current priority */ ldrb r1, [r0, #(P_USRPRI)] strb r1, [r0, #(P_PRIORITY)] ldr r0, Lcurpriority strb r1, [r0] /* Fast return */ ldmfd sp!, {r0-r3, pc} Lwe_need_userret: /* Ok we need to call userret() */ stmfd sp!, {r4-r6, r10-r12} /* Debugging */ ldr r0, Luserret_count1 ldr r1, [r0] add r1, r1, #1 str r1, [r0] #endif /* This could be optimised as we are going from UND32->SVC32 mode */ mrs r4, cpsr_all bic r3, r4, #(PSR_MODE) orr r3, r3, #(PSR_SVC32_MODE) msr cpsr_all, r3 mov r0, r12 /* Reserve a trapframe on the SVC stack */ sub sp, sp, #(TRAPFRAMESIZE) mov r1, sp ldr r2, [r0, #-0x0008] /* Copy spsr */ str r2, [r1], #0x0004 ldmia r0!, {r2, r3, r5, r6} /* copy r0-r5 */ stmia r1!, {r2, r3, r5, r6} ldmia r0!, {r2, r3, r5, r6} /* copy r6-r11 */ stmia r1!, {r2, r3, r5, r6} ldmia r0!, {r2, r3, r5, r6} /* copy r6-r11 */ stmia r1!, {r2, r3, r5, r6} ldmia r0!, {r2, r3, r5, r6} /* copy r12, r13, r14, r15 */ stmia r1!, {r2, r3, r5, r14} str r6, [r1, #0x0000] mov r0, r12 mov r1, sp /* * OK Question Time ... * * Do I need to save SVC r14 ? * It only needs saving if this routine can interrupt something already * running in SVC mode. Since FP is only valid from USR32 mode this * should not happen. */ mov r5, r14 mov r6, r12 /* More optimisation ... Need to code an assembly version of userret() */ bl _arm_fpe_postproc /* Release the trapframe on the SVC stack */ mov r14, r5 mov r0, sp ldr r2, [r0], #0x0004 /* Copy spsr */ str r2, [r6, #-0x0008] ldmia r0!, {r1, r2, r3, r5, r10, r11} /* copy r0-r5 */ stmia r6!, {r1, r2, r3, r5, r10, r11} ldmia r0!, {r1, r2, r3, r5, r10, r11} /* copy r6-r11 */ stmia r6!, {r1, r2, r3, r5, r10, r11} ldmia r0!, {r1, r2, r3} /* copy r12, r13, r14 */ stmia r6!, {r1, r2, r3} ldr r1, [r0, #0x0004] str r1, [r6] add sp, sp, #(TRAPFRAMESIZE) msr cpsr_all, r4 ldmfd sp!, {r4-r6, r10-r12} ldmfd sp!, {r0-r3, pc} /* * Call back routine from FPE when the an exception occurs */ ENTRY(arm_fpe_exception_glue) stmfd sp!, {r0-r6, r10-r12, lr} mov r10, r0 /* This could be optimised as we are going from UND32->SVC32 mode */ mrs r4, cpsr_all bic r3, r4, #(PSR_MODE) orr r3, r3, #(PSR_SVC32_MODE) msr cpsr_all, r3 mov r0, r12 /* Reserve a trapframe on the SVC stack */ sub sp, sp, #(TRAPFRAMESIZE) mov r1, sp ldr r2, [r0, #-0x0008] /* Copy spsr */ str r2, [r1], #0x0004 ldmia r0!, {r2, r3, r5, r6} /* copy r0-r5 */ stmia r1!, {r2, r3, r5, r6} ldmia r0!, {r2, r3, r5, r6} /* copy r6-r11 */ stmia r1!, {r2, r3, r5, r6} ldmia r0!, {r2, r3, r5, r6} /* copy r6-r11 */ stmia r1!, {r2, r3, r5, r6} ldmia r0!, {r2, r3, r5, r6} /* copy r12, r13, r14, r15 */ stmia r1!, {r2, r3, r5, r14} str r6, [r1, #0x0000] mov r0, r10 /* exception */ mov r1, r12 /* fpframe */ mov r2, sp /* trapframe */ /* * OK Question Time ... * * Do I need to save SVC r14 ? * It only needs saving if this routine can interrupt something already * running in SVC mode. Since FP is only valid from USR32 mode this * should not happen. */ mov r5, r14 mov r6, r12 /* More optimisation ... Need to code an assembly version of userret() */ bl _arm_fpe_exception /* Release the trapframe on the SVC stack */ mov r14, r5 mov r0, sp ldr r2, [r0], #0x0004 /* Copy spsr */ str r2, [r6, #-0x0008] ldmia r0!, {r1, r2, r3, r5, r10, r11} /* copy r0-r5 */ stmia r6!, {r1, r2, r3, r5, r10, r11} ldmia r0!, {r1, r2, r3, r5, r10, r11} /* copy r6-r11 */ stmia r6!, {r1, r2, r3, r5, r10, r11} ldmia r0!, {r1, r2, r3} /* copy r12, r13, r14 */ stmia r6!, {r1, r2, r3} ldr r1, [r0, #0x0004] str r1, [r6] add sp, sp, #(TRAPFRAMESIZE) msr cpsr_all, r4 ldmfd sp!, {r0-r6, r10-r12, lr} /* Now pull the original trapframe that the FPE pushed off the stack */ ldmdb r12, {r0, r1} msr cpsr_all, r1 msr spsr_all, r0 mov sp, r12 ldmia sp, {r0-r14}^ mov r0, r0 add sp, sp, #15*4 ldmfd sp!, {pc}^ ENTRY(arm_fpe_set_exception_mask) rfs r1 /* Get FP status */ bic r1, r1, #0x001f0000 /* Zero exception mask */ and r0, r0, #0x0000001f /* Mask new bits */ orr r0, r1, r0, lsl #16 /* Merge */ wfs r0 /* Set status */ mov r0, r1, lsr #16 /* Return old mask */ mov pc, lr /* return */ .global _fpe_nexthandler _fpe_nexthandler: .word _undefinedinstruction_bounce