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/** linux/arch/or32/kernel/entry.S** or32 version* author(s): Matjaz Breskvar (phoenix@opencores.org)** changes:* 18. 11. 2003: Matjaz Breskvar (phoenix@opencores.org)* initial port to or32 architecture* 06. 12. 2003: Matjaz Breskvar (phoenix@opencores.org)* major changes in handling exceptions* physical addresses used only by code in head.S* cleand exception handlers and moved them to entry.S* 10. 11. 2005: Gyorgy Jeney (nog@sdf.lonestar.org)* Added syscall traceing code** syscall table entries are based on ppc port, so they will probably* need some more cleaning.** Stack layout in 'ret_from_system_call':* ptrace needs to have all regs on the stack.* if the order here is changed, it needs to be* updated in fork.c:copy_process, signal.c:do_signal,* ptrace.c and ptrace.h** syscall table entries are based on ppc port, so it will probably need* some more cleaning.*/#include <linux/config.h>#include <linux/linkage.h>#include <linux/sys.h>#include <asm/processor.h>#include <asm/unistd.h>#include <asm/errno.h>#include <asm/or32_asm.h>#include <asm/spr_defs.h>#include <asm/page.h>#include <asm/mmu.h>#include <asm/pgtable.h>/* some defines to ease or32 assembly programming */#include "or32_defs.h"#include "or32_funcs.S"#define GET_CURRENT(reg,t1) \LOAD_SYMBOL_2_GPR(reg,_current_set) ;\tophys (t1,reg) ;\l.lwz reg,0(t1)/* =========================================================[ macros ]=== */#define PUSH_PT_REGS_NO_TRANS \l.addi r1,r1,-(INT_FRAME_SIZE) ;\l.sw GPR3(r1),r3 ;\l.sw ORIG_GPR3(r1),r3 ;\l.mfspr r3,r0,SPR_EPCR_BASE ;\l.sw PC(r1),r3 ;\l.mfspr r3,r0,SPR_ESR_BASE ;\l.sw SR(r1),r3 ;\l.addi r3,r1,+(INT_FRAME_SIZE) ;\l.sw SP(r1),r3 ;\l.sw GPR2(r1),r2 ;\l.lwz r3,GPR3(r1) ;\l.sw GPR4(r1),r4 ;\l.sw GPR5(r1),r5 ;\l.sw GPR6(r1),r6 ;\l.sw GPR7(r1),r7 ;\l.sw GPR8(r1),r8 ;\l.sw GPR9(r1),r9 ;\l.sw GPR10(r1),r10 ;\l.sw GPR11(r1),r11 ;\l.sw GPR12(r1),r12 ;\l.sw GPR13(r1),r13 ;\l.sw GPR14(r1),r14 ;\l.sw GPR15(r1),r15 ;\l.sw GPR16(r1),r16 ;\l.sw GPR17(r1),r17 ;\l.sw GPR18(r1),r18 ;\l.sw GPR19(r1),r19 ;\l.sw GPR20(r1),r20 ;\l.sw GPR21(r1),r21 ;\l.sw GPR22(r1),r22 ;\l.sw GPR23(r1),r23 ;\l.sw GPR24(r1),r24 ;\l.sw GPR25(r1),r25 ;\l.sw GPR26(r1),r26 ;\l.sw GPR27(r1),r27 ;\l.sw GPR28(r1),r28 ;\l.sw GPR29(r1),r29 ;\l.sw GPR30(r1),r30 ;\l.sw GPR31(r1),r31 ;\l.sw RESULT(r1),r0/** We need to disable interrupts at beginning of RESTORE_ALL* since interrupt might come in after we've loaded EPC return address* and overwrite EPC with address somewhere in RESTORE_ALL* which is of course wrong!*/#define RESTORE_ALL \DISABLE_INTERRUPTS(r3,r4) ;\l.lwz r3,PC(r1) ;\l.mtspr r0,r3,SPR_EPCR_BASE ;\l.lwz r3,SR(r1) ;\l.mtspr r0,r3,SPR_ESR_BASE ;\l.lwz r2,GPR2(r1) ;\l.lwz r3,GPR3(r1) ;\l.lwz r4,GPR4(r1) ;\l.lwz r5,GPR5(r1) ;\l.lwz r6,GPR6(r1) ;\l.lwz r7,GPR7(r1) ;\l.lwz r8,GPR8(r1) ;\l.lwz r9,GPR9(r1) ;\l.lwz r10,GPR10(r1) ;\l.lwz r11,GPR11(r1) ;\l.lwz r12,GPR12(r1) ;\l.lwz r13,GPR13(r1) ;\l.lwz r14,GPR14(r1) ;\l.lwz r15,GPR15(r1) ;\l.lwz r16,GPR16(r1) ;\l.lwz r17,GPR17(r1) ;\l.lwz r18,GPR18(r1) ;\l.lwz r19,GPR19(r1) ;\l.lwz r20,GPR20(r1) ;\l.lwz r21,GPR21(r1) ;\l.lwz r22,GPR22(r1) ;\l.lwz r23,GPR23(r1) ;\l.lwz r24,GPR24(r1) ;\l.lwz r25,GPR25(r1) ;\l.lwz r26,GPR26(r1) ;\l.lwz r27,GPR27(r1) ;\l.lwz r28,GPR28(r1) ;\l.lwz r29,GPR29(r1) ;\l.lwz r30,GPR30(r1) ;\l.lwz r31,GPR31(r1) ;\l.lwz r1,SP(r1) ;\l.rfe#define RESTORE_ALL_NO_R11 \DISABLE_INTERRUPTS(r3,r4) ;\l.lwz r3,PC(r1) ;\l.mtspr r0,r3,SPR_EPCR_BASE ;\l.lwz r3,SR(r1) ;\l.mtspr r0,r3,SPR_ESR_BASE ;\l.lwz r2,GPR2(r1) ;\l.lwz r3,GPR3(r1) ;\l.lwz r4,GPR4(r1) ;\l.lwz r5,GPR5(r1) ;\l.lwz r6,GPR6(r1) ;\l.lwz r7,GPR7(r1) ;\l.lwz r8,GPR8(r1) ;\l.lwz r9,GPR9(r1) ;\l.lwz r10,GPR10(r1) ;\l.lwz r12,GPR12(r1) ;\l.lwz r13,GPR13(r1) ;\l.lwz r14,GPR14(r1) ;\l.lwz r15,GPR15(r1) ;\l.lwz r16,GPR16(r1) ;\l.lwz r17,GPR17(r1) ;\l.lwz r18,GPR18(r1) ;\l.lwz r19,GPR19(r1) ;\l.lwz r20,GPR20(r1) ;\l.lwz r21,GPR21(r1) ;\l.lwz r22,GPR22(r1) ;\l.lwz r23,GPR23(r1) ;\l.lwz r24,GPR24(r1) ;\l.lwz r25,GPR25(r1) ;\l.lwz r26,GPR26(r1) ;\l.lwz r27,GPR27(r1) ;\l.lwz r28,GPR28(r1) ;\l.lwz r29,GPR29(r1) ;\l.lwz r30,GPR30(r1) ;\l.lwz r31,GPR31(r1) ;\l.lwz r1,SP(r1) ;\l.rfe#define EXCEPTION_ENTRY(handler) \.global handler ;\handler: ;\/* r1, r2, EPCR, ESR a already saved */ ;\l.sw GPR3(r1),r3 ;\l.sw ORIG_GPR3(r1),r3 ;\l.sw GPR5(r1),r5 ;\l.sw GPR6(r1),r6 ;\l.sw GPR7(r1),r7 ;\l.sw GPR8(r1),r8 ;\l.sw GPR9(r1),r9 ;\l.sw GPR10(r1),r10 ;\l.sw GPR11(r1),r11 ;\/* r12,r13 already saved */ ;\l.sw GPR14(r1),r14 ;\l.sw GPR15(r1),r15 ;\l.sw GPR16(r1),r16 ;\l.sw GPR17(r1),r17 ;\l.sw GPR18(r1),r18 ;\l.sw GPR19(r1),r19 ;\l.sw GPR20(r1),r20 ;\l.sw GPR21(r1),r21 ;\l.sw GPR22(r1),r22 ;\l.sw GPR23(r1),r23 ;\l.sw GPR24(r1),r24 ;\l.sw GPR25(r1),r25 ;\l.sw GPR26(r1),r26 ;\l.sw GPR27(r1),r27 ;\l.sw GPR28(r1),r28 ;\l.sw GPR29(r1),r29 ;\l.sw GPR30(r1),r30 ;\/* r31 already save */ ;\l.sw RESULT(r1),r0#define UNHANDLED_EXCEPTION(handler,vector) \.global handler ;\handler: ;\/* r1, r2, EPCR, ESR a already saved */ ;\l.sw GPR3(r1),r3 ;\l.sw ORIG_GPR3(r1),r3 ;\l.sw GPR5(r1),r5 ;\l.sw GPR6(r1),r6 ;\l.sw GPR7(r1),r7 ;\l.sw GPR8(r1),r8 ;\l.sw GPR9(r1),r9 ;\l.sw GPR10(r1),r10 ;\l.sw GPR11(r1),r11 ;\/* r12,r13 already saved */ ;\l.sw GPR14(r1),r14 ;\l.sw GPR15(r1),r15 ;\l.sw GPR16(r1),r16 ;\l.sw GPR17(r1),r17 ;\l.sw GPR18(r1),r18 ;\l.sw GPR19(r1),r19 ;\l.sw GPR20(r1),r20 ;\l.sw GPR21(r1),r21 ;\l.sw GPR22(r1),r22 ;\l.sw GPR23(r1),r23 ;\l.sw GPR24(r1),r24 ;\l.sw GPR25(r1),r25 ;\l.sw GPR26(r1),r26 ;\l.sw GPR27(r1),r27 ;\l.sw GPR28(r1),r28 ;\l.sw GPR29(r1),r29 ;\l.sw GPR30(r1),r30 ;\/* r31 already saved */ ;\l.sw RESULT(r1),r0 ;\l.addi r3,r1,0 ;\/* r4 is exception EA */ ;\l.addi r5,r0,vector ;\l.jal _unhandled_exception ;\l.nop ;\l.j _ret_from_exception ;\l.nop 1/** NOTE: one should never assume that SPR_EPC, SPR_ESR, SPR_EEAR* contain the same values as when exception we're handling* occured. in fact they never do. if you need them use* values saved on stack (for SPR_EPC, SPR_ESR) or content* of r4 (for SPR_EEAR). for details look at EXCEPTION_HANDLE()* in 'arch/or32/kernel/head.S'*//* =====================================================[ exceptions] === *//* ---[ 0x100: RESET exception ]----------------------------------------- */EXCEPTION_ENTRY(_tng_kernel_start)l.jal _startl.nop/* ---[ 0x200: BUS exception ]------------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x200,0x200)/* ---[ 0x300: Data Page Fault exception ]------------------------------- */EXCEPTION_ENTRY(_data_page_fault_handler)/* set up parameters for do_page_fault */l.addi r3,r1,0 // pt_regs/* r4 set be EXCEPTION_HANDLE */ // effective address of faultl.ori r5,r0,0x300 // exception vector/** __PHX__: TODO** all this can be written much simpler. look at* DTLB miss handler in the CONFIG_GUARD_PROTECTED_CORE part*/#ifdef CONFIG_OR32_NO_SPR_SR_DSXl.lwz r6,PC(r3) // address of an offending insnl.lwz r6,0(r6) // instruction that caused pfl.srli r6,r6,26 // check opcode for jump insnl.sfeqi r6,0 // l.jl.bf 8fl.sfeqi r6,1 // l.jall.bf 8fl.sfeqi r6,3 // l.bnfl.bf 8fl.sfeqi r6,4 // l.bfl.bf 8fl.sfeqi r6,0x11 // l.jrl.bf 8fl.sfeqi r6,0x12 // l.jalrl.bf 8fl.nopl.j 9fl.nop8:l.lwz r6,PC(r3) // address of an offending insnl.addi r6,r6,4l.lwz r6,0(r6) // instruction that caused pfl.srli r6,r6,26 // get opcode9:#elsel.mfspr r6,r0,SPR_SR // SR// l.lwz r6,SR(r3) // ESRl.andi r6,r6,SPR_SR_DSX // check for delay slot exceptionl.sfeqi r6,0x1 // exception happened in delay slotl.bnf 7fl.lwz r6,PC(r3) // address of an offending insnl.addi r6,r6,4 // offending insn is in delay slot7:l.lwz r6,0(r6) // instruction that caused pfl.srli r6,r6,26 // check opcode for write access#endifl.sfgeui r6,0x34 // check opcode for write accessl.bnf 1fl.sfleui r6,0x37l.bnf 1fl.ori r6,r0,0x1 // write accessl.j 2fl.nop1: l.ori r6,r0,0x0 // !write access2:/* call fault.c handler in or32/mm/fault.c */l.jal _do_page_faultl.nopl.j _ret_from_exceptionl.nop/* ---[ 0x400: Insn Page Fault exception ]------------------------------- */EXCEPTION_ENTRY(_insn_page_fault_handler)/* set up parameters for do_page_fault */l.addi r3,r1,0 // pt_regs/* r4 set be EXCEPTION_HANDLE */ // effective address of faultl.ori r5,r0,0x400 // exception vectorl.ori r6,r0,0x0 // !write access/* call fault.c handler in or32/mm/fault.c */l.jal _do_page_faultl.nopl.j _ret_from_exceptionl.nop/* ---[ 0x500: Timer exception ]----------------------------------------- */EXCEPTION_ENTRY(_timer_handler)#ifndef CONFIG_ESR_EXCEPTION_WORKSl.lwz r4,SR(r1) // were interrupts enabled ?l.andi r4,r4,SPR_SR_TEEl.sfeqi r4,0l.bnf 1f // tick irq enabled, all ok.l.nopl.addi r1,r1,-0x8LOAD_SYMBOL_2_GPR(r3,42f)l.sw 0x0(r1),r3l.jal _printkl.sw 0x4(r1),r4l.addi r1,r1,0x8.section .rodata, "a"42:.string "\n\rESR interrupt bug: in _timer_handler (ESR %x %x %x)\n\r".align 4.previousl.ori r4,r4,SPR_SR_TEE // fix the bug// l.sw SR(r1),r41:#endifl.addi r3,r1,0LOAD_SYMBOL_2_GPR(r8,_timer_interrupt)l.jalr r8l.nopl.j _ret_from_intrl.nop/* ---[ 0x600: Aligment exception ]-------------------------------------- */#if 1UNHANDLED_EXCEPTION(_vector_0x600,0x600)#endif#if 0EXCEPTION_ENTRY(_aligment_handler)// l.mfspr r2,r0,SPR_EEAR_BASE /* Load the efective addres */l.addi r2,r4,0// l.mfspr r5,r0,SPR_EPCR_BASE /* Load the insn address */l.lwz r5,PC(r1)l.lwz r3,0(r5) /* Load insn */l.srli r4,r3,26 /* Shift left to get the insn opcode */l.sfeqi r4,0x00 /* Check if the load/store insn is in delay slot */l.bf jmpl.sfeqi r4,0x01l.bf jmpl.sfeqi r4,0x03l.bf jmpl.sfeqi r4,0x04l.bf jmpl.sfeqi r4,0x11l.bf jrl.sfeqi r4,0x12l.bf jrl.nopl.j 1fl.addi r5,r5,4 /* Increment PC to get return insn address */jmp:l.slli r4,r3,6 /* Get the signed extended jump length */l.srai r4,r4,4l.lwz r3,4(r5) /* Load the real load/store insn */l.add r5,r5,r4 /* Calculate jump target address */l.j 1fl.srli r4,r3,26 /* Shift left to get the insn opcode */jr:l.slli r4,r3,9 /* Shift to get the reg nb */l.andi r4,r4,0x7cl.lwz r3,4(r5) /* Load the real load/store insn */l.add r4,r4,r1 /* Load the jump register value from the stack */l.lwz r5,0(r4)l.srli r4,r3,26 /* Shift left to get the insn opcode */1:// l.mtspr r0,r5,SPR_EPCR_BASEl.sw PC(r1),r5l.sfeqi r4,0x26l.bf lhsl.sfeqi r4,0x25l.bf lhzl.sfeqi r4,0x22l.bf lwsl.sfeqi r4,0x21l.bf lwzl.sfeqi r4,0x37l.bf shl.sfeqi r4,0x35l.bf swl.nop1: l.j 1b /* I don't know what to do */l.noplhs: l.lbs r5,0(r2)l.slli r5,r5,8l.lbz r6,1(r2)l.or r5,r5,r6l.srli r4,r3,19l.andi r4,r4,0x7cl.add r4,r4,r1l.j align_endl.sw 0(r4),r5lhz: l.lbz r5,0(r2)l.slli r5,r5,8l.lbz r6,1(r2)l.or r5,r5,r6l.srli r4,r3,19l.andi r4,r4,0x7cl.add r4,r4,r1l.j align_endl.sw 0(r4),r5lws: l.lbs r5,0(r2)l.slli r5,r5,24l.lbz r6,1(r2)l.slli r6,r6,16l.or r5,r5,r6l.lbz r6,2(r2)l.slli r6,r6,8l.or r5,r5,r6l.lbz r6,3(r2)l.or r5,r5,r6l.srli r4,r3,19l.andi r4,r4,0x7cl.add r4,r4,r1l.j align_endl.sw 0(r4),r5lwz: l.lbz r5,0(r2)l.slli r5,r5,24l.lbz r6,1(r2)l.slli r6,r6,16l.or r5,r5,r6l.lbz r6,2(r2)l.slli r6,r6,8l.or r5,r5,r6l.lbz r6,3(r2)l.or r5,r5,r6l.srli r4,r3,19l.andi r4,r4,0x7cl.add r4,r4,r1l.j align_endl.sw 0(r4),r5sh:l.srli r4,r3,9l.andi r4,r4,0x7cl.add r4,r4,r1l.lwz r5,0(r4)l.sb 1(r2),r5l.srli r5,r5,8l.j align_endl.sb 0(r2),r5sw:l.srli r4,r3,9l.andi r4,r4,0x7cl.add r4,r4,r1l.lwz r5,0(r4)l.sb 3(r2),r5l.srli r5,r5,8l.sb 2(r2),r5l.srli r5,r5,8l.sb 1(r2),r5l.srli r5,r5,8l.j align_endl.sb 0(r2),r5align_end:l.j _ret_from_intrl.nop#endif/* ---[ 0x700: Illegal insn exception ]---------------------------------- */UNHANDLED_EXCEPTION(_vector_0x700,0x700)/* ---[ 0x800: External interrupt exception ]---------------------------- */EXCEPTION_ENTRY(_external_irq_handler)#ifndef CONFIG_ESR_EXCEPTION_WORKSl.lwz r4,SR(r1) // were interrupts enabled ?l.andi r4,r4,SPR_SR_IEEl.sfeqi r4,0l.bnf 1f // ext irq enabled, all ok.l.nopl.addi r1,r1,-0x8LOAD_SYMBOL_2_GPR(r3,42f)l.sw 0x0(r1),r3l.jal _printkl.sw 0x4(r1),r4l.addi r1,r1,0x8.section .rodata, "a"42:.string "\n\rESR interrupt bug: in _external_irq_handler (ESR %x %x %x)\n\r".align 4.previousl.ori r4,r4,SPR_SR_IEE // fix the bug// l.sw SR(r1),r41:#endifl.addi r3,r1,0LOAD_SYMBOL_2_GPR(r8,_do_IRQ)l.jalr r8l.nopl.j _ret_from_intrl.nop/* ---[ 0x900: DTLB miss exception ]------------------------------------- *//* ---[ 0xa00: ITLB miss exception ]------------------------------------- *//* ---[ 0xb00: Range exception ]----------------------------------------- */UNHANDLED_EXCEPTION(_vector_0xb00,0xb00)/* ---[ 0xc00: Syscall exception ]--------------------------------------- */EXCEPTION_ENTRY(_sys_call_handler)/* r3 is not tainted by EXCEPTION_HANDLE() *//* r4 holds the EEAR address of the fault, load the original r4 */l.lwz r4,GPR4(r1)/* check that userspace didn't try to fool us with* syscall number greater then __NR_syscall.*/l.sfgeui r11,NR_syscallsl.bnf 10fl.nopl.addi r1,r1,-0x8LOAD_SYMBOL_2_GPR(r3,42f)l.sw 0x0(r1),r3l.jal _printkl.sw 0x4(r1),r11l.addi r1,r1,0x8.section .rodata, "a"42:.string "\n\rkernel error: SYSCALL_NR out of range (0x%x)\n\r".align 4.previous/* let's fix it to the last */l.ori r11,r0,NR_syscalls-110:ENABLE_INTERRUPTS(r9) // enable interrupts, r9 is temp// Check if syscall needs to be tracedl.lwz r30,TASK_PTRACE(r2)l.andi r30,r30,PT_TRACESYSl.sfnei r30,0l.bf trace_a_syscalll.nopl.movhi r30,hi(_sys_call_table)l.ori r30,r30,lo(_sys_call_table)l.slli r11,r11,2l.add r30,r30,r11l.lwz r30,0(r30)// Ok, syscall doesn't need to be traced, call itl.jalr r30l.addi r8,r1,0 // regs pointerl.sw GPR11(r1),r11 // save return value20:l.sw RESULT(r1),r11 // save result99:l.j _ret_from_sys_calll.addi r12,r0,0x1 // we came from syscall/* ---[ 0xd00: Trap exception ]------------------------------------------ */UNHANDLED_EXCEPTION(_vector_0xd00,0xd00)/* ---[ 0xe00: Trap exception ]------------------------------------------ */UNHANDLED_EXCEPTION(_vector_0xe00,0xe00)/* ---[ 0xf00: Reserved exception ]-------------------------------------- */UNHANDLED_EXCEPTION(_vector_0xf00,0xf00)/* ---[ 0x1000: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1000,0x1000)/* ---[ 0x1100: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1100,0x1100)/* ---[ 0x1200: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1200,0x1200)/* ---[ 0x1300: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1300,0x1300)/* ---[ 0x1400: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1400,0x1400)/* ---[ 0x1500: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1500,0x1500)/* ---[ 0x1600: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1600,0x1600)/* ---[ 0x1700: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1700,0x1700)/* ---[ 0x1800: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1800,0x1800)/* ---[ 0x1900: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1900,0x1900)/* ---[ 0x1a00: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1a00,0x1a00)/* ---[ 0x1b00: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1b00,0x1b00)/* ---[ 0x1c00: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1c00,0x1c00)/* ---[ 0x1d00: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1d00,0x1d00)/* ---[ 0x1e00: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1e00,0x1e00)/* ---[ 0x1f00: Reserved exception ]------------------------------------- */UNHANDLED_EXCEPTION(_vector_0x1f00,0x1f00)/* ========================================================[ return ] === */ENTRY(_ret_from_fork)l.jal _schedule_taill.nop// Check if PT_TRACESYS is set on the current processl.lwz r4,TASK_PTRACE(r2)l.andi r4,r4,PT_TRACESYSl.sfnei r4,0l.bf tracesys_exitl.nopl.j _ret_from_sys_calll.nopENTRY(_ret_from_sys_call)DISABLE_INTERRUPTS(r3,r4)/* kernel -> user transition* we need to save kernel sp so we can restore it* at user -> kernel transition*/LOAD_SYMBOL_2_GPR(r3,_current_set)l.lwz r2,0(r3)l.addi r4,r1,INT_FRAME_SIZEl.sw (THREAD+THREAD_KSP)(r2),r4/** if (current->need_resched != 0)* schedule();*/reschedule:l.lwz r3,NEED_RESCHED(r2)l.sfeqi r3,0l.bf signal_returnl.nopl.jal _schedulel.nopl.j reschedulel.nop/** if (current->sigpending != 0)* do_signal(r3,r4);*/signal_return:/* __PHX__ recheck the right behaviour */// ENABLE_INTERRUPTS(r3)DISABLE_INTERRUPTS(r3,r4)/* r12 is parameter: 1 if we came fro sys_call, else 0 */l.lwz r5,SIGPENDING(r2)l.sfeqi r5,0l.bf _restore_alll.addi r3,r12,0l.addi r4,r0,0l.addi r5,r1,0l.jal _do_signall.nopl.j _restore_alll.nopENTRY(_restore_all)// we need to save KSP here too// or else fork's 'eat' stack spacel.addi r4,r1,INT_FRAME_SIZEl.sw (THREAD+THREAD_KSP)(r2),r4RESTORE_ALLENTRY(_ret_from_intr)// i386 version:// GET_CURRENT(%ebx)ENTRY(_ret_from_exception)l.lwz r4,SR(r1)l.andi r3,r4,SPR_SR_SMl.sfeqi r3,0l.bnf _restore_alll.nop/** return to usermode*/l.j _ret_from_sys_calll.nop/* =================================================[ trace syscall ] === */trace_a_syscall:l.jal _syscall_trace// Save the system call number for stracel.sw SYSCALLNO(r1),r11// Restore argument registersl.lwz r3,GPR3(r1)l.lwz r4,GPR4(r1)l.lwz r5,GPR5(r1)l.lwz r6,GPR6(r1)l.lwz r7,GPR7(r1)l.lwz r11,SYSCALLNO(r1)l.movhi r30,hi(_sys_call_table)l.ori r30,r30,lo(_sys_call_table)l.slli r11,r11,2l.add r30,r30,r11l.lwz r30,0(r30)// Do the sys calll.jalr r30l.addi r8,r1,0 // regs pointerl.sw GPR11(r1),r11 // save return valuel.sw RESULT(r1),r11 // save resultl.addi r12,r0,0x1 // we came from syscalltracesys_exit:l.jal _syscall_tracel.addi r14,r12,0l.j _ret_from_sys_calll.addi r12,r14,0/* ========================================================[ switch ] === *//** This routine switches between two different tasks. The process* state of one is saved on its kernel stack. Then the state* of the other is restored from its kernel stack. The memory* management hardware is updated to the second process's state.* Finally, we can return to the second process, via the 'return'.** Note: there are two ways to get to the "going out" portion* of this code; either by coming in via the entry (_switch)* or via "fork" which must set up an environment equivalent* to the "_switch" path. If you change this (or in particular, the* SAVE_REGS macro), you'll have to change the fork code also.*/ENTRY(__switch)l.sw (GPR3-INT_FRAME_SIZE)(r1),r3l.mtspr r0,r9,SPR_EPCR_BASE /* Link register to EPCR */l.mfspr r3,r0,SPR_SR /* From SR to ESR */l.mtspr r0,r3,SPR_ESR_BASEl.addi r11,r2,0 /* Save old 'current' to 'last' return value*/l.lwz r3,(GPR3-INT_FRAME_SIZE)(r1)PUSH_PT_REGS_NO_TRANSl.sw THREAD_KSP(r3),r1 /* Set old stack pointer */l.lwz r1,THREAD_KSP(r4) /* Load new stack pointer */l.addi r2,r4,-THREAD /* set current (r2) to new */RESTORE_ALL_NO_R11/* =================================================[ syscall table ] === */.data.align 4.global _sys_call_table_sys_call_table:.long SYMBOL_NAME(_sys_ni_syscall) /* 0 - old "setup()" system call */.long SYMBOL_NAME(_sys_exit).long SYMBOL_NAME(_sys_fork).long SYMBOL_NAME(_sys_read).long SYMBOL_NAME(_sys_write).long SYMBOL_NAME(_sys_open) /* 5 */.long SYMBOL_NAME(_sys_close).long SYMBOL_NAME(_sys_waitpid).long SYMBOL_NAME(_sys_creat).long SYMBOL_NAME(_sys_link).long SYMBOL_NAME(_sys_unlink) /* 10 */.long SYMBOL_NAME(_sys_execve).long SYMBOL_NAME(_sys_chdir).long SYMBOL_NAME(_sys_time).long SYMBOL_NAME(_sys_mknod).long SYMBOL_NAME(_sys_chmod) /* 15 */.long SYMBOL_NAME(_sys_lchown).long SYMBOL_NAME(_sys_ni_syscall) /* old break syscall holder */.long SYMBOL_NAME(_sys_stat).long SYMBOL_NAME(_sys_lseek).long SYMBOL_NAME(_sys_getpid) /* 20 */.long SYMBOL_NAME(_sys_mount).long SYMBOL_NAME(_sys_oldumount).long SYMBOL_NAME(_sys_setuid).long SYMBOL_NAME(_sys_getuid).long SYMBOL_NAME(_sys_stime) /* 25 */.long SYMBOL_NAME(_sys_ptrace).long SYMBOL_NAME(_sys_alarm).long SYMBOL_NAME(_sys_fstat).long SYMBOL_NAME(_sys_pause).long SYMBOL_NAME(_sys_utime) /* 30 */.long SYMBOL_NAME(_sys_ni_syscall) /* old stty syscall holder */.long SYMBOL_NAME(_sys_ni_syscall) /* old gtty syscall holder */.long SYMBOL_NAME(_sys_access).long SYMBOL_NAME(_sys_nice).long SYMBOL_NAME(_sys_ni_syscall) /* 35 */ /* old ftime syscall holder */.long SYMBOL_NAME(_sys_sync).long SYMBOL_NAME(_sys_kill).long SYMBOL_NAME(_sys_rename).long SYMBOL_NAME(_sys_mkdir).long SYMBOL_NAME(_sys_rmdir) /* 40 */.long SYMBOL_NAME(_sys_dup).long SYMBOL_NAME(_sys_pipe).long SYMBOL_NAME(_sys_times).long SYMBOL_NAME(_sys_ni_syscall) /* old prof syscall holder */.long SYMBOL_NAME(_sys_brk) /* 45 */.long SYMBOL_NAME(_sys_setgid).long SYMBOL_NAME(_sys_getgid).long SYMBOL_NAME(_sys_signal).long SYMBOL_NAME(_sys_geteuid).long SYMBOL_NAME(_sys_getegid) /* 50 */.long SYMBOL_NAME(_sys_acct).long SYMBOL_NAME(_sys_umount) /* recycled never used phys() */.long SYMBOL_NAME(_sys_ni_syscall) /* old lock syscall holder */.long SYMBOL_NAME(_sys_ioctl).long SYMBOL_NAME(_sys_fcntl) /* 55 */.long SYMBOL_NAME(_sys_ni_syscall) /* old mpx syscall holder */.long SYMBOL_NAME(_sys_setpgid).long SYMBOL_NAME(_sys_ni_syscall) /* old ulimit syscall holder */.long SYMBOL_NAME(_sys_ni_syscall) /* old _sys_olduname holder */.long SYMBOL_NAME(_sys_umask) /* 60 */.long SYMBOL_NAME(_sys_chroot).long SYMBOL_NAME(_sys_ustat).long SYMBOL_NAME(_sys_dup2).long SYMBOL_NAME(_sys_getppid).long SYMBOL_NAME(_sys_getpgrp) /* 65 */.long SYMBOL_NAME(_sys_setsid).long SYMBOL_NAME(_sys_sigaction).long SYMBOL_NAME(_sys_sgetmask).long SYMBOL_NAME(_sys_ssetmask).long SYMBOL_NAME(_sys_setreuid) /* 70 */.long SYMBOL_NAME(_sys_setregid).long SYMBOL_NAME(_sys_sigsuspend).long SYMBOL_NAME(_sys_sigpending).long SYMBOL_NAME(_sys_sethostname).long SYMBOL_NAME(_sys_setrlimit) /* 75 */.long SYMBOL_NAME(_sys_old_getrlimit).long SYMBOL_NAME(_sys_getrusage).long SYMBOL_NAME(_sys_gettimeofday).long SYMBOL_NAME(_sys_settimeofday).long SYMBOL_NAME(_sys_getgroups) /* 80 */.long SYMBOL_NAME(_sys_setgroups).long SYMBOL_NAME(_sys_select) /* was old_select */.long SYMBOL_NAME(_sys_symlink).long SYMBOL_NAME(_sys_lstat).long SYMBOL_NAME(_sys_readlink) /* 85 */.long SYMBOL_NAME(_sys_uselib).long SYMBOL_NAME(_sys_swapon).long SYMBOL_NAME(_sys_reboot).long SYMBOL_NAME(_old_readdir).long SYMBOL_NAME(_old_mmap) /* 90 */.long SYMBOL_NAME(_sys_munmap).long SYMBOL_NAME(_sys_truncate).long SYMBOL_NAME(_sys_ftruncate).long SYMBOL_NAME(_sys_fchmod).long SYMBOL_NAME(_sys_fchown) /* 95 */.long SYMBOL_NAME(_sys_getpriority).long SYMBOL_NAME(_sys_setpriority).long SYMBOL_NAME(_sys_ni_syscall) /* old profil syscall holder */.long SYMBOL_NAME(_sys_statfs).long SYMBOL_NAME(_sys_fstatfs) /* 100 */.long SYMBOL_NAME(_sys_ni_syscall) /* _sys_ioperm in i386 */.long SYMBOL_NAME(_sys_socketcall).long SYMBOL_NAME(_sys_syslog).long SYMBOL_NAME(_sys_setitimer).long SYMBOL_NAME(_sys_getitimer) /* 105 */.long SYMBOL_NAME(_sys_newstat).long SYMBOL_NAME(_sys_newlstat).long SYMBOL_NAME(_sys_newfstat).long SYMBOL_NAME(_sys_ni_syscall) /* old _sys_uname holder */.long SYMBOL_NAME(_sys_ni_syscall) /* 110 */ /* _sys_iopl in i386 */.long SYMBOL_NAME(_sys_vhangup).long SYMBOL_NAME(_sys_ni_syscall) /* old 'idle' syscall */.long SYMBOL_NAME(_sys_ni_syscall) /* vm86 in i386 */.long SYMBOL_NAME(_sys_wait4).long SYMBOL_NAME(_sys_swapoff) /* 115 */.long SYMBOL_NAME(_sys_sysinfo).long SYMBOL_NAME(_sys_ipc).long SYMBOL_NAME(_sys_fsync).long SYMBOL_NAME(_sys_sigreturn).long SYMBOL_NAME(_sys_clone) /* 120 */.long SYMBOL_NAME(_sys_setdomainname).long SYMBOL_NAME(_sys_newuname).long SYMBOL_NAME(_sys_ni_syscall).long SYMBOL_NAME(_sys_adjtimex).long SYMBOL_NAME(_sys_mprotect) /* 125 */.long SYMBOL_NAME(_sys_sigprocmask).long SYMBOL_NAME(_sys_create_module).long SYMBOL_NAME(_sys_init_module).long SYMBOL_NAME(_sys_delete_module).long SYMBOL_NAME(_sys_get_kernel_syms) /* 130 */.long SYMBOL_NAME(_sys_quotactl).long SYMBOL_NAME(_sys_getpgid).long SYMBOL_NAME(_sys_fchdir).long SYMBOL_NAME(_sys_bdflush).long SYMBOL_NAME(_sys_sysfs) /* 135 */.long SYMBOL_NAME(_sys_personality).long SYMBOL_NAME(_sys_ni_syscall) /* for afs_syscall */.long SYMBOL_NAME(_sys_setfsuid).long SYMBOL_NAME(_sys_setfsgid).long SYMBOL_NAME(_sys_llseek) /* 140 */.long SYMBOL_NAME(_sys_getdents).long SYMBOL_NAME(_sys_select).long SYMBOL_NAME(_sys_flock).long SYMBOL_NAME(_sys_msync).long SYMBOL_NAME(_sys_readv) /* 145 */.long SYMBOL_NAME(_sys_writev).long SYMBOL_NAME(_sys_getsid).long SYMBOL_NAME(_sys_fdatasync).long SYMBOL_NAME(_sys_sysctl).long SYMBOL_NAME(_sys_mlock) /* 150 */.long SYMBOL_NAME(_sys_munlock).long SYMBOL_NAME(_sys_mlockall).long SYMBOL_NAME(_sys_munlockall).long SYMBOL_NAME(_sys_sched_setparam).long SYMBOL_NAME(_sys_sched_getparam) /* 155 */.long SYMBOL_NAME(_sys_sched_setscheduler).long SYMBOL_NAME(_sys_sched_getscheduler).long SYMBOL_NAME(_sys_sched_yield).long SYMBOL_NAME(_sys_sched_get_priority_max).long SYMBOL_NAME(_sys_sched_get_priority_min) /* 160 */.long SYMBOL_NAME(_sys_sched_rr_get_interval).long SYMBOL_NAME(_sys_nanosleep).long SYMBOL_NAME(_sys_mremap).long SYMBOL_NAME(_sys_setresuid).long SYMBOL_NAME(_sys_getresuid) /* 165 */.long SYMBOL_NAME(_sys_query_module).long SYMBOL_NAME(_sys_poll).long SYMBOL_NAME(_sys_nfsservctl).long SYMBOL_NAME(_sys_setresgid).long SYMBOL_NAME(_sys_getresgid) /* 170 */.long SYMBOL_NAME(_sys_prctl).long SYMBOL_NAME(_sys_rt_sigreturn).long SYMBOL_NAME(_sys_rt_sigaction).long SYMBOL_NAME(_sys_rt_sigprocmask).long SYMBOL_NAME(_sys_rt_sigpending) /* 175 */.long SYMBOL_NAME(_sys_rt_sigtimedwait).long SYMBOL_NAME(_sys_rt_sigqueueinfo).long SYMBOL_NAME(_sys_rt_sigsuspend).long SYMBOL_NAME(_sys_pread).long SYMBOL_NAME(_sys_pwrite) /* 180 */.long SYMBOL_NAME(_sys_chown).long SYMBOL_NAME(_sys_getcwd).long SYMBOL_NAME(_sys_capget).long SYMBOL_NAME(_sys_capset).long SYMBOL_NAME(_sys_sigaltstack) /* 185 */.long SYMBOL_NAME(_sys_sendfile).long SYMBOL_NAME(_sys_ni_syscall) /* streams1 */.long SYMBOL_NAME(_sys_ni_syscall) /* streams2 */.long SYMBOL_NAME(_sys_vfork).long SYMBOL_NAME(_sys_getrlimit) /* 190 */.long SYMBOL_NAME(_sys_readahead).long SYMBOL_NAME(_sys_mmap2).long SYMBOL_NAME(_sys_truncate64).long SYMBOL_NAME(_sys_ftruncate64).long SYMBOL_NAME(_sys_stat64) /* 195 */.long SYMBOL_NAME(_sys_lstat64).long SYMBOL_NAME(_sys_fstat64).long SYMBOL_NAME(_sys_ni_syscall) /* _sys_pciconfig_read */.long SYMBOL_NAME(_sys_ni_syscall) /* _sys_pciconfig_write */.long SYMBOL_NAME(_sys_ni_syscall) /* 200 */ /* _sys_pciconfig_iobase */.long SYMBOL_NAME(_sys_ni_syscall) /* 201 - reserved - MacOnLinux - new */.long SYMBOL_NAME(_sys_getdents64).long SYMBOL_NAME(_sys_pivot_root).long SYMBOL_NAME(_sys_fcntl64).long SYMBOL_NAME(_sys_madvise) /* 205 */.long SYMBOL_NAME(_sys_mincore).long SYMBOL_NAME(_sys_gettid).long SYMBOL_NAME(_sys_tkill).long SYMBOL_NAME(_sys_setxattr).long SYMBOL_NAME(_sys_lsetxattr) /* 210 */.long SYMBOL_NAME(_sys_fsetxattr).long SYMBOL_NAME(_sys_getxattr).long SYMBOL_NAME(_sys_lgetxattr).long SYMBOL_NAME(_sys_fgetxattr).long SYMBOL_NAME(_sys_listxattr) /* 215 */.long SYMBOL_NAME(_sys_llistxattr).long SYMBOL_NAME(_sys_flistxattr).long SYMBOL_NAME(_sys_removexattr).long SYMBOL_NAME(_sys_lremovexattr).long SYMBOL_NAME(_sys_fremovexattr) /* 220 */.long SYMBOL_NAME(_sys_ni_syscall) /* reserved for sys_futex */.long SYMBOL_NAME(_sys_ni_syscall) /* reserved for sys_sched_setaffinity */.long SYMBOL_NAME(_sys_ni_syscall) /* reserved for sys_sched_getaffinity */.long SYMBOL_NAME(_sys_ni_syscall) /* reserved for sys_security */.long SYMBOL_NAME(_sys_ni_syscall) /* 225 reserved for Tux */.long SYMBOL_NAME(_sys_ni_syscall) /* reserved for sys_sendfile64 */.long SYMBOL_NAME(_sys_ni_syscall) /* reserved for sys_io_setup */.long SYMBOL_NAME(_sys_ni_syscall) /* reserved for sys_io_destroy */.long SYMBOL_NAME(_sys_ni_syscall) /* reserved for sys_io_getevents */.long SYMBOL_NAME(_sys_ni_syscall) /* 230 reserved for sys_io_submit */.long SYMBOL_NAME(_sys_ni_syscall) /* reserved for sys_io_cancel *//** NOTE!! This doesn't have to be exact - we just have* to make sure we have _enough_ of the "sys_ni_syscall"* entries. Don't panic if you notice that this hasn't* been shrunk every time we add a new system call.*/.rept NR_syscalls-(.-_sys_call_table)/4.long SYMBOL_NAME(_sys_ni_syscall).endr/* ============================================================[ EOF ]=== */
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