/* entry.S: FR-V entry * * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * * Entry to the kernel is "interesting": * (1) There are no stack pointers, not even for the kernel * (2) General Registers should not be clobbered * (3) There are no kernel-only data registers * (4) Since all addressing modes are wrt to a General Register, no global * variables can be reached * * We deal with this by declaring that we shall kill GR28 on entering the * kernel from userspace * * However, since break interrupts can interrupt the CPU even when PSR.ET==0, * they can't rely on GR28 to be anything useful, and so need to clobber a * separate register (GR31). Break interrupts are managed in break.S * * GR29 _is_ saved, and holds the current task pointer globally * */ #include #include #include #include #include #include #include #include #define nr_syscalls ((syscall_table_size)/4) .section .text.entry .balign 4 .macro LEDS val # sethi.p %hi(0xe1200004),gr30 # setlo %lo(0xe1200004),gr30 # setlos #~\val,gr31 # st gr31,@(gr30,gr0) # sethi.p %hi(0xffc00100),gr30 # setlo %lo(0xffc00100),gr30 # sth gr0,@(gr30,gr0) # membar .endm .macro LEDS32 # not gr31,gr31 # sethi.p %hi(0xe1200004),gr30 # setlo %lo(0xe1200004),gr30 # st.p gr31,@(gr30,gr0) # srli gr31,#16,gr31 # sethi.p %hi(0xffc00100),gr30 # setlo %lo(0xffc00100),gr30 # sth gr31,@(gr30,gr0) # membar .endm ############################################################################### # # entry point for External interrupts received whilst executing userspace code # ############################################################################### .globl __entry_uspace_external_interrupt .type __entry_uspace_external_interrupt,@function __entry_uspace_external_interrupt: LEDS 0x6200 sethi.p %hi(__kernel_frame0_ptr),gr28 setlo %lo(__kernel_frame0_ptr),gr28 ldi @(gr28,#0),gr28 # handle h/w single-step through exceptions sti gr0,@(gr28,#REG__STATUS) .globl __entry_uspace_external_interrupt_reentry __entry_uspace_external_interrupt_reentry: LEDS 0x6201 setlos #REG__END,gr30 dcpl gr28,gr30,#0 # finish building the exception frame sti sp, @(gr28,#REG_SP) stdi gr2, @(gr28,#REG_GR(2)) stdi gr4, @(gr28,#REG_GR(4)) stdi gr6, @(gr28,#REG_GR(6)) stdi gr8, @(gr28,#REG_GR(8)) stdi gr10,@(gr28,#REG_GR(10)) stdi gr12,@(gr28,#REG_GR(12)) stdi gr14,@(gr28,#REG_GR(14)) stdi gr16,@(gr28,#REG_GR(16)) stdi gr18,@(gr28,#REG_GR(18)) stdi gr20,@(gr28,#REG_GR(20)) stdi gr22,@(gr28,#REG_GR(22)) stdi gr24,@(gr28,#REG_GR(24)) stdi gr26,@(gr28,#REG_GR(26)) sti gr0, @(gr28,#REG_GR(28)) sti gr29,@(gr28,#REG_GR(29)) stdi.p gr30,@(gr28,#REG_GR(30)) # set up the kernel stack pointer ori gr28,0,sp movsg tbr ,gr20 movsg psr ,gr22 movsg pcsr,gr21 movsg isr ,gr23 movsg ccr ,gr24 movsg cccr,gr25 movsg lr ,gr26 movsg lcr ,gr27 setlos.p #-1,gr4 andi gr22,#PSR_PS,gr5 /* try to rebuild original PSR value */ andi.p gr22,#~(PSR_PS|PSR_S),gr6 slli gr5,#1,gr5 or gr6,gr5,gr5 andi gr5,#~PSR_ET,gr5 sti gr20,@(gr28,#REG_TBR) sti gr21,@(gr28,#REG_PC) sti gr5 ,@(gr28,#REG_PSR) sti gr23,@(gr28,#REG_ISR) stdi gr24,@(gr28,#REG_CCR) stdi gr26,@(gr28,#REG_LR) sti gr4 ,@(gr28,#REG_SYSCALLNO) movsg iacc0h,gr4 movsg iacc0l,gr5 stdi gr4,@(gr28,#REG_IACC0) movsg gner0,gr4 movsg gner1,gr5 stdi.p gr4,@(gr28,#REG_GNER0) # interrupts start off fully disabled in the interrupt handler subcc gr0,gr0,gr0,icc2 /* set Z and clear C */ # set up kernel global registers sethi.p %hi(__kernel_current_task),gr5 setlo %lo(__kernel_current_task),gr5 sethi.p %hi(_gp),gr16 setlo %lo(_gp),gr16 ldi @(gr5,#0),gr29 ldi.p @(gr29,#4),gr15 ; __current_thread_info = current->thread_info # make sure we (the kernel) get div-zero and misalignment exceptions setlos #ISR_EDE|ISR_DTT_DIVBYZERO|ISR_EMAM_EXCEPTION,gr5 movgs gr5,isr # switch to the kernel trap table sethi.p %hi(__entry_kerneltrap_table),gr6 setlo %lo(__entry_kerneltrap_table),gr6 movgs gr6,tbr # set the return address sethi.p %hi(__entry_return_from_user_interrupt),gr4 setlo %lo(__entry_return_from_user_interrupt),gr4 movgs gr4,lr # raise the minimum interrupt priority to 15 (NMI only) and enable exceptions movsg psr,gr4 ori gr4,#PSR_PIL_14,gr4 movgs gr4,psr ori gr4,#PSR_PIL_14|PSR_ET,gr4 movgs gr4,psr LEDS 0x6202 bra do_IRQ .size __entry_uspace_external_interrupt,.-__entry_uspace_external_interrupt ############################################################################### # # entry point for External interrupts received whilst executing kernel code # - on arriving here, the following registers should already be set up: # GR15 - current thread_info struct pointer # GR16 - kernel GP-REL pointer # GR29 - current task struct pointer # TBR - kernel trap vector table # ISR - kernel's preferred integer controls # ############################################################################### .globl __entry_kernel_external_interrupt .type __entry_kernel_external_interrupt,@function __entry_kernel_external_interrupt: LEDS 0x6210 // sub sp,gr15,gr31 // LEDS32 # set up the stack pointer or.p sp,gr0,gr30 subi sp,#REG__END,sp sti gr30,@(sp,#REG_SP) # handle h/w single-step through exceptions sti gr0,@(sp,#REG__STATUS) .globl __entry_kernel_external_interrupt_reentry __entry_kernel_external_interrupt_reentry: LEDS 0x6211 # set up the exception frame setlos #REG__END,gr30 dcpl sp,gr30,#0 sti.p gr28,@(sp,#REG_GR(28)) ori sp,0,gr28 # finish building the exception frame stdi gr2,@(gr28,#REG_GR(2)) stdi gr4,@(gr28,#REG_GR(4)) stdi gr6,@(gr28,#REG_GR(6)) stdi gr8,@(gr28,#REG_GR(8)) stdi gr10,@(gr28,#REG_GR(10)) stdi gr12,@(gr28,#REG_GR(12)) stdi gr14,@(gr28,#REG_GR(14)) stdi gr16,@(gr28,#REG_GR(16)) stdi gr18,@(gr28,#REG_GR(18)) stdi gr20,@(gr28,#REG_GR(20)) stdi gr22,@(gr28,#REG_GR(22)) stdi gr24,@(gr28,#REG_GR(24)) stdi gr26,@(gr28,#REG_GR(26)) sti gr29,@(gr28,#REG_GR(29)) stdi.p gr30,@(gr28,#REG_GR(30)) # note virtual interrupts will be fully enabled upon return subicc gr0,#1,gr0,icc2 /* clear Z, set C */ movsg tbr ,gr20 movsg psr ,gr22 movsg pcsr,gr21 movsg isr ,gr23 movsg ccr ,gr24 movsg cccr,gr25 movsg lr ,gr26 movsg lcr ,gr27 setlos.p #-1,gr4 andi gr22,#PSR_PS,gr5 /* try to rebuild original PSR value */ andi.p gr22,#~(PSR_PS|PSR_S),gr6 slli gr5,#1,gr5 or gr6,gr5,gr5 andi.p gr5,#~PSR_ET,gr5 # set CCCR.CC3 to Undefined to abort atomic-modify completion inside the kernel # - for an explanation of how it works, see: Documentation/frv/atomic-ops.txt andi gr25,#~0xc0,gr25 sti gr20,@(gr28,#REG_TBR) sti gr21,@(gr28,#REG_PC) sti gr5 ,@(gr28,#REG_PSR) sti gr23,@(gr28,#REG_ISR) stdi gr24,@(gr28,#REG_CCR) stdi gr26,@(gr28,#REG_LR) sti gr4 ,@(gr28,#REG_SYSCALLNO) movsg iacc0h,gr4 movsg iacc0l,gr5 stdi gr4,@(gr28,#REG_IACC0) movsg gner0,gr4 movsg gner1,gr5 stdi.p gr4,@(gr28,#REG_GNER0) # interrupts start off fully disabled in the interrupt handler subcc gr0,gr0,gr0,icc2 /* set Z and clear C */ # set the return address sethi.p %hi(__entry_return_from_kernel_interrupt),gr4 setlo %lo(__entry_return_from_kernel_interrupt),gr4 movgs gr4,lr # clear power-saving mode flags movsg hsr0,gr4 andi gr4,#~HSR0_PDM,gr4 movgs gr4,hsr0 # raise the minimum interrupt priority to 15 (NMI only) and enable exceptions movsg psr,gr4 ori gr4,#PSR_PIL_14,gr4 movgs gr4,psr ori gr4,#PSR_ET,gr4 movgs gr4,psr LEDS 0x6212 bra do_IRQ .size __entry_kernel_external_interrupt,.-__entry_kernel_external_interrupt ############################################################################### # # deal with interrupts that were actually virtually disabled # - we need to really disable them, flag the fact and return immediately # - if you change this, you must alter break.S also # ############################################################################### .balign L1_CACHE_BYTES .globl __entry_kernel_external_interrupt_virtually_disabled .type __entry_kernel_external_interrupt_virtually_disabled,@function __entry_kernel_external_interrupt_virtually_disabled: movsg psr,gr30 andi gr30,#~PSR_PIL,gr30 ori gr30,#PSR_PIL_14,gr30 ; debugging interrupts only movgs gr30,psr subcc gr0,gr0,gr0,icc2 ; leave Z set, clear C rett #0 .size __entry_kernel_external_interrupt_virtually_disabled,.-__entry_kernel_external_interrupt_virtually_disabled ############################################################################### # # deal with re-enablement of interrupts that were pending when virtually re-enabled # - set ICC2.C, re-enable the real interrupts and return # - we can clear ICC2.Z because we shouldn't be here if it's not 0 [due to TIHI] # - if you change this, you must alter break.S also # ############################################################################### .balign L1_CACHE_BYTES .globl __entry_kernel_external_interrupt_virtual_reenable .type __entry_kernel_external_interrupt_virtual_reenable,@function __entry_kernel_external_interrupt_virtual_reenable: movsg psr,gr30 andi gr30,#~PSR_PIL,gr30 ; re-enable interrupts movgs gr30,psr subicc gr0,#1,gr0,icc2 ; clear Z, set C rett #0 .size __entry_kernel_external_interrupt_virtual_reenable,.-__entry_kernel_external_interrupt_virtual_reenable ############################################################################### # # entry point for Software and Progam interrupts generated whilst executing userspace code # ############################################################################### .globl __entry_uspace_softprog_interrupt .type __entry_uspace_softprog_interrupt,@function .globl __entry_uspace_handle_mmu_fault __entry_uspace_softprog_interrupt: LEDS 0x6000 #ifdef CONFIG_MMU movsg ear0,gr28 __entry_uspace_handle_mmu_fault: movgs gr28,scr2 #endif sethi.p %hi(__kernel_frame0_ptr),gr28 setlo %lo(__kernel_frame0_ptr),gr28 ldi @(gr28,#0),gr28 # handle h/w single-step through exceptions sti gr0,@(gr28,#REG__STATUS) .globl __entry_uspace_softprog_interrupt_reentry __entry_uspace_softprog_interrupt_reentry: LEDS 0x6001 setlos #REG__END,gr30 dcpl gr28,gr30,#0 # set up the kernel stack pointer sti.p sp,@(gr28,#REG_SP) ori gr28,0,sp sti gr0,@(gr28,#REG_GR(28)) stdi gr20,@(gr28,#REG_GR(20)) stdi gr22,@(gr28,#REG_GR(22)) movsg tbr,gr20 movsg pcsr,gr21 movsg psr,gr22 sethi.p %hi(__entry_return_from_user_exception),gr23 setlo %lo(__entry_return_from_user_exception),gr23 bra __entry_common .size __entry_uspace_softprog_interrupt,.-__entry_uspace_softprog_interrupt # single-stepping was disabled on entry to a TLB handler that then faulted #ifdef CONFIG_MMU .globl __entry_uspace_handle_mmu_fault_sstep __entry_uspace_handle_mmu_fault_sstep: movgs gr28,scr2 sethi.p %hi(__kernel_frame0_ptr),gr28 setlo %lo(__kernel_frame0_ptr),gr28 ldi @(gr28,#0),gr28 # flag single-step re-enablement sti gr0,@(gr28,#REG__STATUS) bra __entry_uspace_softprog_interrupt_reentry #endif ############################################################################### # # entry point for Software and Progam interrupts generated whilst executing kernel code # ############################################################################### .globl __entry_kernel_softprog_interrupt .type __entry_kernel_softprog_interrupt,@function __entry_kernel_softprog_interrupt: LEDS 0x6004 #ifdef CONFIG_MMU movsg ear0,gr30 movgs gr30,scr2 #endif .globl __entry_kernel_handle_mmu_fault __entry_kernel_handle_mmu_fault: # set up the stack pointer subi sp,#REG__END,sp sti sp,@(sp,#REG_SP) sti sp,@(sp,#REG_SP-4) andi sp,#~7,sp # handle h/w single-step through exceptions sti gr0,@(sp,#REG__STATUS) .globl __entry_kernel_softprog_interrupt_reentry __entry_kernel_softprog_interrupt_reentry: LEDS 0x6005 setlos #REG__END,gr30 dcpl sp,gr30,#0 # set up the exception frame sti.p gr28,@(sp,#REG_GR(28)) ori sp,0,gr28 stdi gr20,@(gr28,#REG_GR(20)) stdi gr22,@(gr28,#REG_GR(22)) ldi @(sp,#REG_SP),gr22 /* reconstruct the old SP */ addi gr22,#REG__END,gr22 sti gr22,@(sp,#REG_SP) # set CCCR.CC3 to Undefined to abort atomic-modify completion inside the kernel # - for an explanation of how it works, see: Documentation/frv/atomic-ops.txt movsg cccr,gr20 andi gr20,#~0xc0,gr20 movgs gr20,cccr movsg tbr,gr20 movsg pcsr,gr21 movsg psr,gr22 sethi.p %hi(__entry_return_from_kernel_exception),gr23 setlo %lo(__entry_return_from_kernel_exception),gr23 bra __entry_common .size __entry_kernel_softprog_interrupt,.-__entry_kernel_softprog_interrupt # single-stepping was disabled on entry to a TLB handler that then faulted #ifdef CONFIG_MMU .globl __entry_kernel_handle_mmu_fault_sstep __entry_kernel_handle_mmu_fault_sstep: # set up the stack pointer subi sp,#REG__END,sp sti sp,@(sp,#REG_SP) sti sp,@(sp,#REG_SP-4) andi sp,#~7,sp # flag single-step re-enablement sethi #REG__STATUS_STEP,gr30 sti gr30,@(sp,#REG__STATUS) bra __entry_kernel_softprog_interrupt_reentry #endif ############################################################################### # # the rest of the kernel entry point code # - on arriving here, the following registers should be set up: # GR1 - kernel stack pointer # GR7 - syscall number (trap 0 only) # GR8-13 - syscall args (trap 0 only) # GR20 - saved TBR # GR21 - saved PC # GR22 - saved PSR # GR23 - return handler address # GR28 - exception frame on stack # SCR2 - saved EAR0 where applicable (clobbered by ICI & ICEF insns on FR451) # PSR - PSR.S 1, PSR.ET 0 # ############################################################################### .globl __entry_common .type __entry_common,@function __entry_common: LEDS 0x6008 # finish building the exception frame stdi gr2,@(gr28,#REG_GR(2)) stdi gr4,@(gr28,#REG_GR(4)) stdi gr6,@(gr28,#REG_GR(6)) stdi gr8,@(gr28,#REG_GR(8)) stdi gr10,@(gr28,#REG_GR(10)) stdi gr12,@(gr28,#REG_GR(12)) stdi gr14,@(gr28,#REG_GR(14)) stdi gr16,@(gr28,#REG_GR(16)) stdi gr18,@(gr28,#REG_GR(18)) stdi gr24,@(gr28,#REG_GR(24)) stdi gr26,@(gr28,#REG_GR(26)) sti gr29,@(gr28,#REG_GR(29)) stdi gr30,@(gr28,#REG_GR(30)) movsg lcr ,gr27 movsg lr ,gr26 movgs gr23,lr movsg cccr,gr25 movsg ccr ,gr24 movsg isr ,gr23 setlos.p #-1,gr4 andi gr22,#PSR_PS,gr5 /* try to rebuild original PSR value */ andi.p gr22,#~(PSR_PS|PSR_S),gr6 slli gr5,#1,gr5 or gr6,gr5,gr5 andi gr5,#~PSR_ET,gr5 sti gr20,@(gr28,#REG_TBR) sti gr21,@(gr28,#REG_PC) sti gr5 ,@(gr28,#REG_PSR) sti gr23,@(gr28,#REG_ISR) stdi gr24,@(gr28,#REG_CCR) stdi gr26,@(gr28,#REG_LR) sti gr4 ,@(gr28,#REG_SYSCALLNO) movsg iacc0h,gr4 movsg iacc0l,gr5 stdi gr4,@(gr28,#REG_IACC0) movsg gner0,gr4 movsg gner1,gr5 stdi.p gr4,@(gr28,#REG_GNER0) # set up virtual interrupt disablement subicc gr0,#1,gr0,icc2 /* clear Z flag, set C flag */ # set up kernel global registers sethi.p %hi(__kernel_current_task),gr5 setlo %lo(__kernel_current_task),gr5 sethi.p %hi(_gp),gr16 setlo %lo(_gp),gr16 ldi @(gr5,#0),gr29 ldi @(gr29,#4),gr15 ; __current_thread_info = current->thread_info # switch to the kernel trap table sethi.p %hi(__entry_kerneltrap_table),gr6 setlo %lo(__entry_kerneltrap_table),gr6 movgs gr6,tbr # make sure we (the kernel) get div-zero and misalignment exceptions setlos #ISR_EDE|ISR_DTT_DIVBYZERO|ISR_EMAM_EXCEPTION,gr5 movgs gr5,isr # clear power-saving mode flags movsg hsr0,gr4 andi gr4,#~HSR0_PDM,gr4 movgs gr4,hsr0 # multiplex again using old TBR as a guide setlos.p #TBR_TT,gr3 sethi %hi(__entry_vector_table),gr6 and.p gr20,gr3,gr5 setlo %lo(__entry_vector_table),gr6 srli gr5,#2,gr5 ld @(gr5,gr6),gr5 LEDS 0x6009 jmpl @(gr5,gr0) .size __entry_common,.-__entry_common ############################################################################### # # handle instruction MMU fault # ############################################################################### #ifdef CONFIG_MMU .globl __entry_insn_mmu_fault __entry_insn_mmu_fault: LEDS 0x6010 setlos #0,gr8 movsg esr0,gr9 movsg scr2,gr10 # now that we've accessed the exception regs, we can enable exceptions movsg psr,gr4 ori gr4,#PSR_ET,gr4 movgs gr4,psr sethi.p %hi(do_page_fault),gr5 setlo %lo(do_page_fault),gr5 jmpl @(gr5,gr0) ; call do_page_fault(0,esr0,ear0) #endif ############################################################################### # # handle instruction access error # ############################################################################### .globl __entry_insn_access_error __entry_insn_access_error: LEDS 0x6011 sethi.p %hi(insn_access_error),gr5 setlo %lo(insn_access_error),gr5 movsg esfr1,gr8 movsg epcr0,gr9 movsg esr0,gr10 # now that we've accessed the exception regs, we can enable exceptions movsg psr,gr4 ori gr4,#PSR_ET,gr4 movgs gr4,psr jmpl @(gr5,gr0) ; call insn_access_error(esfr1,epcr0,esr0) ############################################################################### # # handle various instructions of dubious legality # ############################################################################### .globl __entry_unsupported_trap .globl __entry_illegal_instruction .globl __entry_privileged_instruction .globl __entry_debug_exception __entry_unsupported_trap: subi gr21,#4,gr21 sti gr21,@(gr28,#REG_PC) __entry_illegal_instruction: __entry_privileged_instruction: __entry_debug_exception: LEDS 0x6012 sethi.p %hi(illegal_instruction),gr5 setlo %lo(illegal_instruction),gr5 movsg esfr1,gr8 movsg epcr0,gr9 movsg esr0,gr10 # now that we've accessed the exception regs, we can enable exceptions movsg psr,gr4 ori gr4,#PSR_ET,gr4 movgs gr4,psr jmpl @(gr5,gr0) ; call ill_insn(esfr1,epcr0,esr0) ############################################################################### # # handle atomic operation emulation for userspace # ############################################################################### .globl __entry_atomic_op __entry_atomic_op: LEDS 0x6012 sethi.p %hi(atomic_operation),gr5 setlo %lo(atomic_operation),gr5 movsg esfr1,gr8 movsg epcr0,gr9 movsg esr0,gr10 # now that we've accessed the exception regs, we can enable exceptions movsg psr,gr4 ori gr4,#PSR_ET,gr4 movgs gr4,psr jmpl @(gr5,gr0) ; call atomic_operation(esfr1,epcr0,esr0) ############################################################################### # # handle media exception # ############################################################################### .globl __entry_media_exception __entry_media_exception: LEDS 0x6013 sethi.p %hi(media_exception),gr5 setlo %lo(media_exception),gr5 movsg msr0,gr8 movsg msr1,gr9 # now that we've accessed the exception regs, we can enable exceptions movsg psr,gr4 ori gr4,#PSR_ET,gr4 movgs gr4,psr jmpl @(gr5,gr0) ; call media_excep(msr0,msr1) ############################################################################### # # handle data MMU fault # handle data DAT fault (write-protect exception) # ############################################################################### #ifdef CONFIG_MMU .globl __entry_data_mmu_fault __entry_data_mmu_fault: .globl __entry_data_dat_fault __entry_data_dat_fault: LEDS 0x6014 setlos #1,gr8 movsg esr0,gr9 movsg scr2,gr10 ; saved EAR0 # now that we've accessed the exception regs, we can enable exceptions movsg psr,gr4 ori gr4,#PSR_ET,gr4 movgs gr4,psr sethi.p %hi(do_page_fault),gr5 setlo %lo(do_page_fault),gr5 jmpl @(gr5,gr0) ; call do_page_fault(1,esr0,ear0) #endif ############################################################################### # # handle data and instruction access exceptions # ############################################################################### .globl __entry_insn_access_exception .globl __entry_data_access_exception __entry_insn_access_exception: __entry_data_access_exception: LEDS 0x6016 sethi.p %hi(memory_access_exception),gr5 setlo %lo(memory_access_exception),gr5 movsg esr0,gr8 movsg scr2,gr9 ; saved EAR0 movsg epcr0,gr10 # now that we've accessed the exception regs, we can enable exceptions movsg psr,gr4 ori gr4,#PSR_ET,gr4 movgs gr4,psr jmpl @(gr5,gr0) ; call memory_access_error(esr0,ear0,epcr0) ############################################################################### # # handle data access error # ############################################################################### .globl __entry_data_access_error __entry_data_access_error: LEDS 0x6016 sethi.p %hi(data_access_error),gr5 setlo %lo(data_access_error),gr5 movsg esfr1,gr8 movsg esr15,gr9 movsg ear15,gr10 # now that we've accessed the exception regs, we can enable exceptions movsg psr,gr4 ori gr4,#PSR_ET,gr4 movgs gr4,psr jmpl @(gr5,gr0) ; call data_access_error(esfr1,esr15,ear15) ############################################################################### # # handle data store error # ############################################################################### .globl __entry_data_store_error __entry_data_store_error: LEDS 0x6017 sethi.p %hi(data_store_error),gr5 setlo %lo(data_store_error),gr5 movsg esfr1,gr8 movsg esr14,gr9 # now that we've accessed the exception regs, we can enable exceptions movsg psr,gr4 ori gr4,#PSR_ET,gr4 movgs gr4,psr jmpl @(gr5,gr0) ; call data_store_error(esfr1,esr14) ############################################################################### # # handle division exception # ############################################################################### .globl __entry_division_exception __entry_division_exception: LEDS 0x6018 sethi.p %hi(division_exception),gr5 setlo %lo(division_exception),gr5 movsg esfr1,gr8 movsg esr0,gr9 movsg isr,gr10 # now that we've accessed the exception regs, we can enable exceptions movsg psr,gr4 ori gr4,#PSR_ET,gr4 movgs gr4,psr jmpl @(gr5,gr0) ; call div_excep(esfr1,esr0,isr) ############################################################################### # # handle compound exception # ############################################################################### .globl __entry_compound_exception __entry_compound_exception: LEDS 0x6019 sethi.p %hi(compound_exception),gr5 setlo %lo(compound_exception),gr5 movsg esfr1,gr8 movsg esr0,gr9 movsg esr14,gr10 movsg esr15,gr11 movsg msr0,gr12 movsg msr1,gr13 # now that we've accessed the exception regs, we can enable exceptions movsg psr,gr4 ori gr4,#PSR_ET,gr4 movgs gr4,psr jmpl @(gr5,gr0) ; call comp_excep(esfr1,esr0,esr14,esr15,msr0,msr1) ############################################################################### # # handle interrupts and NMIs # ############################################################################### .globl __entry_do_IRQ __entry_do_IRQ: LEDS 0x6020 # we can enable exceptions movsg psr,gr4 ori gr4,#PSR_ET,gr4 movgs gr4,psr bra do_IRQ .globl __entry_do_NMI __entry_do_NMI: LEDS 0x6021 # we can enable exceptions movsg psr,gr4 ori gr4,#PSR_ET,gr4 movgs gr4,psr bra do_NMI ############################################################################### # # the return path for a newly forked child process # - __switch_to() saved the old current pointer in GR8 for us # ############################################################################### .globl ret_from_fork ret_from_fork: LEDS 0x6100 call schedule_tail # fork & co. return 0 to child setlos.p #0,gr8 bra __syscall_exit ################################################################################################### # # Return to user mode is not as complex as all this looks, # but we want the default path for a system call return to # go as quickly as possible which is why some of this is # less clear than it otherwise should be. # ################################################################################################### .balign L1_CACHE_BYTES .globl system_call system_call: LEDS 0x6101 movsg psr,gr4 ; enable exceptions ori gr4,#PSR_ET,gr4 movgs gr4,psr sti gr7,@(gr28,#REG_SYSCALLNO) sti.p gr8,@(gr28,#REG_ORIG_GR8) subicc gr7,#nr_syscalls,gr0,icc0 bnc icc0,#0,__syscall_badsys ldi @(gr15,#TI_FLAGS),gr4 ori gr4,#_TIF_SYSCALL_TRACE,gr4 andicc gr4,#_TIF_SYSCALL_TRACE,gr0,icc0 bne icc0,#0,__syscall_trace_entry __syscall_call: slli.p gr7,#2,gr7 sethi %hi(sys_call_table),gr5 setlo %lo(sys_call_table),gr5 ld @(gr5,gr7),gr4 calll @(gr4,gr0) ############################################################################### # # return to interrupted process # ############################################################################### __syscall_exit: LEDS 0x6300 sti gr8,@(gr28,#REG_GR(8)) ; save return value # rebuild saved psr - execve will change it for init/main.c ldi @(gr28,#REG_PSR),gr22 srli gr22,#1,gr5 andi.p gr22,#~PSR_PS,gr22 andi gr5,#PSR_PS,gr5 or gr5,gr22,gr22 ori gr22,#PSR_S,gr22 # keep current PSR in GR23 movsg psr,gr23 # make sure we don't miss an interrupt setting need_resched or sigpending between # sampling and the RETT ori gr23,#PSR_PIL_14,gr23 movgs gr23,psr ldi @(gr15,#TI_FLAGS),gr4 sethi.p %hi(_TIF_ALLWORK_MASK),gr5 setlo %lo(_TIF_ALLWORK_MASK),gr5 andcc gr4,gr5,gr0,icc0 bne icc0,#0,__syscall_exit_work # restore all registers and return __entry_return_direct: LEDS 0x6301 andi gr22,#~PSR_ET,gr22 movgs gr22,psr ldi @(gr28,#REG_ISR),gr23 lddi @(gr28,#REG_CCR),gr24 lddi @(gr28,#REG_LR) ,gr26 ldi @(gr28,#REG_PC) ,gr21 ldi @(gr28,#REG_TBR),gr20 movgs gr20,tbr movgs gr21,pcsr movgs gr23,isr movgs gr24,ccr movgs gr25,cccr movgs gr26,lr movgs gr27,lcr lddi @(gr28,#REG_GNER0),gr4 movgs gr4,gner0 movgs gr5,gner1 lddi @(gr28,#REG_IACC0),gr4 movgs gr4,iacc0h movgs gr5,iacc0l lddi @(gr28,#REG_GR(4)) ,gr4 lddi @(gr28,#REG_GR(6)) ,gr6 lddi @(gr28,#REG_GR(8)) ,gr8 lddi @(gr28,#REG_GR(10)),gr10 lddi @(gr28,#REG_GR(12)),gr12 lddi @(gr28,#REG_GR(14)),gr14 lddi @(gr28,#REG_GR(16)),gr16 lddi @(gr28,#REG_GR(18)),gr18 lddi @(gr28,#REG_GR(20)),gr20 lddi @(gr28,#REG_GR(22)),gr22 lddi @(gr28,#REG_GR(24)),gr24 lddi @(gr28,#REG_GR(26)),gr26 ldi @(gr28,#REG_GR(29)),gr29 lddi @(gr28,#REG_GR(30)),gr30 # check to see if a debugging return is required LEDS 0x67f0 movsg ccr,gr2 ldi @(gr28,#REG__STATUS),gr3 andicc gr3,#REG__STATUS_STEP,gr0,icc0 bne icc0,#0,__entry_return_singlestep movgs gr2,ccr ldi @(gr28,#REG_SP) ,sp lddi @(gr28,#REG_GR(2)) ,gr2 ldi @(gr28,#REG_GR(28)),gr28 LEDS 0x67fe // movsg pcsr,gr31 // LEDS32 #if 0 # store the current frame in the workram on the FR451 movgs gr28,scr2 sethi.p %hi(0xfe800000),gr28 setlo %lo(0xfe800000),gr28 stdi gr2,@(gr28,#REG_GR(2)) stdi gr4,@(gr28,#REG_GR(4)) stdi gr6,@(gr28,#REG_GR(6)) stdi gr8,@(gr28,#REG_GR(8)) stdi gr10,@(gr28,#REG_GR(10)) stdi gr12,@(gr28,#REG_GR(12)) stdi gr14,@(gr28,#REG_GR(14)) stdi gr16,@(gr28,#REG_GR(16)) stdi gr18,@(gr28,#REG_GR(18)) stdi gr24,@(gr28,#REG_GR(24)) stdi gr26,@(gr28,#REG_GR(26)) sti gr29,@(gr28,#REG_GR(29)) stdi gr30,@(gr28,#REG_GR(30)) movsg tbr ,gr30 sti gr30,@(gr28,#REG_TBR) movsg pcsr,gr30 sti gr30,@(gr28,#REG_PC) movsg psr ,gr30 sti gr30,@(gr28,#REG_PSR) movsg isr ,gr30 sti gr30,@(gr28,#REG_ISR) movsg ccr ,gr30 movsg cccr,gr31 stdi gr30,@(gr28,#REG_CCR) movsg lr ,gr30 movsg lcr ,gr31 stdi gr30,@(gr28,#REG_LR) sti gr0 ,@(gr28,#REG_SYSCALLNO) movsg scr2,gr28 #endif rett #0 # return via break.S __entry_return_singlestep: movgs gr2,ccr lddi @(gr28,#REG_GR(2)) ,gr2 ldi @(gr28,#REG_SP) ,sp ldi @(gr28,#REG_GR(28)),gr28 LEDS 0x67ff break .globl __entry_return_singlestep_breaks_here __entry_return_singlestep_breaks_here: nop ############################################################################### # # return to a process interrupted in kernel space # - we need to consider preemption if that is enabled # ############################################################################### .balign L1_CACHE_BYTES __entry_return_from_kernel_exception: LEDS 0x6302 movsg psr,gr23 ori gr23,#PSR_PIL_14,gr23 movgs gr23,psr bra __entry_return_direct .balign L1_CACHE_BYTES __entry_return_from_kernel_interrupt: LEDS 0x6303 movsg psr,gr23 ori gr23,#PSR_PIL_14,gr23 movgs gr23,psr #ifdef CONFIG_PREEMPT ldi @(gr15,#TI_PRE_COUNT),gr5 subicc gr5,#0,gr0,icc0 beq icc0,#0,__entry_return_direct __entry_preempt_need_resched: ldi @(gr15,#TI_FLAGS),gr4 andicc gr4,#_TIF_NEED_RESCHED,gr0,icc0 beq icc0,#1,__entry_return_direct setlos #PREEMPT_ACTIVE,gr5 sti gr5,@(gr15,#TI_FLAGS) andi gr23,#~PSR_PIL,gr23 movgs gr23,psr call schedule sti gr0,@(gr15,#TI_PRE_COUNT) movsg psr,gr23 ori gr23,#PSR_PIL_14,gr23 movgs gr23,psr bra __entry_preempt_need_resched #else bra __entry_return_direct #endif ############################################################################### # # perform work that needs to be done immediately before resumption # ############################################################################### .globl __entry_return_from_user_exception .balign L1_CACHE_BYTES __entry_return_from_user_exception: LEDS 0x6501 __entry_resume_userspace: # make sure we don't miss an interrupt setting need_resched or sigpending between # sampling and the RETT movsg psr,gr23 ori gr23,#PSR_PIL_14,gr23 movgs gr23,psr __entry_return_from_user_interrupt: LEDS 0x6402 ldi @(gr15,#TI_FLAGS),gr4 sethi.p %hi(_TIF_WORK_MASK),gr5 setlo %lo(_TIF_WORK_MASK),gr5 andcc gr4,gr5,gr0,icc0 beq icc0,#1,__entry_return_direct __entry_work_pending: LEDS 0x6404 andicc gr4,#_TIF_NEED_RESCHED,gr0,icc0 beq icc0,#1,__entry_work_notifysig __entry_work_resched: LEDS 0x6408 movsg psr,gr23 andi gr23,#~PSR_PIL,gr23 movgs gr23,psr call schedule movsg psr,gr23 ori gr23,#PSR_PIL_14,gr23 movgs gr23,psr LEDS 0x6401 ldi @(gr15,#TI_FLAGS),gr4 sethi.p %hi(_TIF_WORK_MASK),gr5 setlo %lo(_TIF_WORK_MASK),gr5 andcc gr4,gr5,gr0,icc0 beq icc0,#1,__entry_return_direct andicc gr4,#_TIF_NEED_RESCHED,gr0,icc0 bne icc0,#1,__entry_work_resched __entry_work_notifysig: LEDS 0x6410 ori.p gr4,#0,gr8 call do_notify_resume bra __entry_resume_userspace # perform syscall entry tracing __syscall_trace_entry: LEDS 0x6320 setlos.p #0,gr8 call do_syscall_trace ldi @(gr28,#REG_SYSCALLNO),gr7 lddi @(gr28,#REG_GR(8)) ,gr8 lddi @(gr28,#REG_GR(10)),gr10 lddi.p @(gr28,#REG_GR(12)),gr12 subicc gr7,#nr_syscalls,gr0,icc0 bnc icc0,#0,__syscall_badsys bra __syscall_call # perform syscall exit tracing __syscall_exit_work: LEDS 0x6340 andicc gr4,#_TIF_SYSCALL_TRACE,gr0,icc0 beq icc0,#1,__entry_work_pending movsg psr,gr23 andi gr23,#~PSR_PIL,gr23 ; could let do_syscall_trace() call schedule() movgs gr23,psr setlos.p #1,gr8 call do_syscall_trace bra __entry_resume_userspace __syscall_badsys: LEDS 0x6380 setlos #-ENOSYS,gr8 sti gr8,@(gr28,#REG_GR(8)) ; save return value bra __entry_resume_userspace ############################################################################### # # syscall vector table # ############################################################################### .section .rodata ALIGN .globl sys_call_table sys_call_table: .long sys_restart_syscall /* 0 - old "setup()" system call, used for restarting */ .long sys_exit .long sys_fork .long sys_read .long sys_write .long sys_open /* 5 */ .long sys_close .long sys_waitpid .long sys_creat .long sys_link .long sys_unlink /* 10 */ .long sys_execve .long sys_chdir .long sys_time .long sys_mknod .long sys_chmod /* 15 */ .long sys_lchown16 .long sys_ni_syscall /* old break syscall holder */ .long sys_stat .long sys_lseek .long sys_getpid /* 20 */ .long sys_mount .long sys_oldumount .long sys_setuid16 .long sys_getuid16 .long sys_ni_syscall // sys_stime /* 25 */ .long sys_ptrace .long sys_alarm .long sys_fstat .long sys_pause .long sys_utime /* 30 */ .long sys_ni_syscall /* old stty syscall holder */ .long sys_ni_syscall /* old gtty syscall holder */ .long sys_access .long sys_nice .long sys_ni_syscall /* 35 */ /* old ftime syscall holder */ .long sys_sync .long sys_kill .long sys_rename .long sys_mkdir .long sys_rmdir /* 40 */ .long sys_dup .long sys_pipe .long sys_times .long sys_ni_syscall /* old prof syscall holder */ .long sys_brk /* 45 */ .long sys_setgid16 .long sys_getgid16 .long sys_ni_syscall // sys_signal .long sys_geteuid16 .long sys_getegid16 /* 50 */ .long sys_acct .long sys_umount /* recycled never used phys( */ .long sys_ni_syscall /* old lock syscall holder */ .long sys_ioctl .long sys_fcntl /* 55 */ .long sys_ni_syscall /* old mpx syscall holder */ .long sys_setpgid .long sys_ni_syscall /* old ulimit syscall holder */ .long sys_ni_syscall /* old old uname syscall */ .long sys_umask /* 60 */ .long sys_chroot .long sys_ustat .long sys_dup2 .long sys_getppid .long sys_getpgrp /* 65 */ .long sys_setsid .long sys_sigaction .long sys_ni_syscall // sys_sgetmask .long sys_ni_syscall // sys_ssetmask .long sys_setreuid16 /* 70 */ .long sys_setregid16 .long sys_sigsuspend .long sys_ni_syscall // sys_sigpending .long sys_sethostname .long sys_setrlimit /* 75 */ .long sys_ni_syscall // sys_old_getrlimit .long sys_getrusage .long sys_gettimeofday .long sys_settimeofday .long sys_getgroups16 /* 80 */ .long sys_setgroups16 .long sys_ni_syscall /* old_select slot */ .long sys_symlink .long sys_lstat .long sys_readlink /* 85 */ .long sys_uselib .long sys_swapon .long sys_reboot .long sys_ni_syscall // old_readdir .long sys_ni_syscall /* 90 */ /* old_mmap slot */ .long sys_munmap .long sys_truncate .long sys_ftruncate .long sys_fchmod .long sys_fchown16 /* 95 */ .long sys_getpriority .long sys_setpriority .long sys_ni_syscall /* old profil syscall holder */ .long sys_statfs .long sys_fstatfs /* 100 */ .long sys_ni_syscall /* ioperm for i386 */ .long sys_socketcall .long sys_syslog .long sys_setitimer .long sys_getitimer /* 105 */ .long sys_newstat .long sys_newlstat .long sys_newfstat .long sys_ni_syscall /* obsolete olduname( syscall */ .long sys_ni_syscall /* iopl for i386 */ /* 110 */ .long sys_vhangup .long sys_ni_syscall /* obsolete idle( syscall */ .long sys_ni_syscall /* vm86old for i386 */ .long sys_wait4 .long sys_swapoff /* 115 */ .long sys_sysinfo .long sys_ipc .long sys_fsync .long sys_sigreturn .long sys_clone /* 120 */ .long sys_setdomainname .long sys_newuname .long sys_ni_syscall /* old "cacheflush" */ .long sys_adjtimex .long sys_mprotect /* 125 */ .long sys_sigprocmask .long sys_ni_syscall /* old "create_module" */ .long sys_init_module .long sys_delete_module .long sys_ni_syscall /* old "get_kernel_syms" */ .long sys_quotactl .long sys_getpgid .long sys_fchdir .long sys_bdflush .long sys_sysfs /* 135 */ .long sys_personality .long sys_ni_syscall /* for afs_syscall */ .long sys_setfsuid16 .long sys_setfsgid16 .long sys_llseek /* 140 */ .long sys_getdents .long sys_select .long sys_flock .long sys_msync .long sys_readv /* 145 */ .long sys_writev .long sys_getsid .long sys_fdatasync .long sys_sysctl .long sys_mlock /* 150 */ .long sys_munlock .long sys_mlockall .long sys_munlockall .long sys_sched_setparam .long sys_sched_getparam /* 155 */ .long sys_sched_setscheduler .long sys_sched_getscheduler .long sys_sched_yield .long sys_sched_get_priority_max .long sys_sched_get_priority_min /* 160 */ .long sys_sched_rr_get_interval .long sys_nanosleep .long sys_mremap .long sys_setresuid16 .long sys_getresuid16 /* 165 */ .long sys_ni_syscall /* for vm86 */ .long sys_ni_syscall /* Old sys_query_module */ .long sys_poll .long sys_nfsservctl .long sys_setresgid16 /* 170 */ .long sys_getresgid16 .long sys_prctl .long sys_rt_sigreturn .long sys_rt_sigaction .long sys_rt_sigprocmask /* 175 */ .long sys_rt_sigpending .long sys_rt_sigtimedwait .long sys_rt_sigqueueinfo .long sys_rt_sigsuspend .long sys_pread64 /* 180 */ .long sys_pwrite64 .long sys_chown16 .long sys_getcwd .long sys_capget .long sys_capset /* 185 */ .long sys_sigaltstack .long sys_sendfile .long sys_ni_syscall /* streams1 */ .long sys_ni_syscall /* streams2 */ .long sys_vfork /* 190 */ .long sys_getrlimit .long sys_mmap2 .long sys_truncate64 .long sys_ftruncate64 .long sys_stat64 /* 195 */ .long sys_lstat64 .long sys_fstat64 .long sys_lchown .long sys_getuid .long sys_getgid /* 200 */ .long sys_geteuid .long sys_getegid .long sys_setreuid .long sys_setregid .long sys_getgroups /* 205 */ .long sys_setgroups .long sys_fchown .long sys_setresuid .long sys_getresuid .long sys_setresgid /* 210 */ .long sys_getresgid .long sys_chown .long sys_setuid .long sys_setgid .long sys_setfsuid /* 215 */ .long sys_setfsgid .long sys_pivot_root .long sys_mincore .long sys_madvise .long sys_getdents64 /* 220 */ .long sys_fcntl64 .long sys_ni_syscall /* reserved for TUX */ .long sys_ni_syscall /* Reserved for Security */ .long sys_gettid .long sys_readahead /* 225 */ .long sys_setxattr .long sys_lsetxattr .long sys_fsetxattr .long sys_getxattr .long sys_lgetxattr /* 230 */ .long sys_fgetxattr .long sys_listxattr .long sys_llistxattr .long sys_flistxattr .long sys_removexattr /* 235 */ .long sys_lremovexattr .long sys_fremovexattr .long sys_tkill .long sys_sendfile64 .long sys_futex /* 240 */ .long sys_sched_setaffinity .long sys_sched_getaffinity .long sys_ni_syscall //sys_set_thread_area .long sys_ni_syscall //sys_get_thread_area .long sys_io_setup /* 245 */ .long sys_io_destroy .long sys_io_getevents .long sys_io_submit .long sys_io_cancel .long sys_fadvise64 /* 250 */ .long sys_ni_syscall .long sys_exit_group .long sys_lookup_dcookie .long sys_epoll_create .long sys_epoll_ctl /* 255 */ .long sys_epoll_wait .long sys_remap_file_pages .long sys_set_tid_address .long sys_timer_create .long sys_timer_settime /* 260 */ .long sys_timer_gettime .long sys_timer_getoverrun .long sys_timer_delete .long sys_clock_settime .long sys_clock_gettime /* 265 */ .long sys_clock_getres .long sys_clock_nanosleep .long sys_statfs64 .long sys_fstatfs64 .long sys_tgkill /* 270 */ .long sys_utimes .long sys_fadvise64_64 .long sys_ni_syscall /* sys_vserver */ .long sys_mbind .long sys_get_mempolicy .long sys_set_mempolicy .long sys_mq_open .long sys_mq_unlink .long sys_mq_timedsend .long sys_mq_timedreceive /* 280 */ .long sys_mq_notify .long sys_mq_getsetattr .long sys_ni_syscall /* reserved for kexec */ .long sys_waitid .long sys_ni_syscall /* 285 */ /* available */ .long sys_add_key .long sys_request_key .long sys_keyctl .long sys_ioprio_set .long sys_ioprio_get /* 290 */ .long sys_inotify_init .long sys_inotify_add_watch .long sys_inotify_rm_watch .long sys_migrate_pages .long sys_openat /* 295 */ .long sys_mkdirat .long sys_mknodat .long sys_fchownat .long sys_futimesat .long sys_fstatat64 /* 300 */ .long sys_unlinkat .long sys_renameat .long sys_linkat .long sys_symlinkat .long sys_readlinkat /* 305 */ .long sys_fchmodat .long sys_faccessat .long sys_pselect6 .long sys_ppoll .long sys_unshare /* 310 */ .long sys_set_robust_list .long sys_get_robust_list .long sys_splice .long sys_sync_file_range .long sys_tee /* 315 */ .long sys_vmsplice .long sys_move_pages .long sys_getcpu .long sys_epoll_pwait .long sys_utimensat /* 320 */ .long sys_signalfd .long sys_timerfd_create .long sys_eventfd .long sys_fallocate .long sys_timerfd_settime /* 325 */ .long sys_timerfd_gettime .long sys_signalfd4 .long sys_eventfd2 .long sys_epoll_create1 .long sys_dup3 /* 330 */ .long sys_pipe2 .long sys_inotify_init1 .long sys_preadv .long sys_pwritev syscall_table_size = (. - sys_call_table)