entry.S
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- /* $Id: entry.S,v 1.170 2001/11/13 00:57:05 davem Exp $
- * arch/sparc/kernel/entry.S: Sparc trap low-level entry points.
- *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
- * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
- * Copyright (C) 1996-1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- * Copyright (C) 1997 Anton Blanchard (anton@progsoc.uts.edu.au)
- */
- #include <linux/config.h>
- #include <linux/errno.h>
- #include <asm/head.h>
- #include <asm/asi.h>
- #include <asm/smp.h>
- #include <asm/kgdb.h>
- #include <asm/contregs.h>
- #include <asm/ptrace.h>
- #include <asm/psr.h>
- #include <asm/cprefix.h>
- #include <asm/vaddrs.h>
- #include <asm/memreg.h>
- #include <asm/page.h>
- #ifdef CONFIG_SUN4
- #include <asm/pgtsun4.h>
- #else
- #include <asm/pgtsun4c.h>
- #endif
- #include <asm/winmacro.h>
- #include <asm/signal.h>
- #include <asm/obio.h>
- #include <asm/mxcc.h>
- #include <asm/asmmacro.h>
- #define curptr g6
- #define NR_SYSCALLS 256 /* Each OS is different... */
- /* First, KGDB low level things. This is a rewrite
- * of the routines found in the sparc-stub.c asm() statement
- * from the gdb distribution. This is also dual-purpose
- * as a software trap for userlevel programs.
- */
- .data
- .align 4
- in_trap_handler:
- .word 0
- .text
- .align 4
- ! This function is called when any SPARC trap (except window overflow or
- ! underflow) occurs. It makes sure that the invalid register window is still
- ! available before jumping into C code. It will also restore the world if you
- ! return from handle_exception.
- .globl C_LABEL(trap_low)
- C_LABEL(trap_low):
- rd %wim, %l3
- SAVE_ALL
- sethi %hi(in_trap_handler), %l4
- ld [%lo(in_trap_handler) + %l4], %l5
- inc %l5
- st %l5, [%lo(in_trap_handler) + %l4]
- /* Make sure kgdb sees the same state we just saved. */
- LOAD_PT_GLOBALS(sp)
- LOAD_PT_INS(sp)
- ld [%sp + REGWIN_SZ + PT_Y], %l4
- ld [%sp + REGWIN_SZ + PT_WIM], %l3
- ld [%sp + REGWIN_SZ + PT_PSR], %l0
- ld [%sp + REGWIN_SZ + PT_PC], %l1
- ld [%sp + REGWIN_SZ + PT_NPC], %l2
- rd %tbr, %l5 /* Never changes... */
- /* Make kgdb exception frame. */
- sub %sp,(16+1+6+1+72)*4,%sp ! Make room for input & locals
- ! + hidden arg + arg spill
- ! + doubleword alignment
- ! + registers[72] local var
- SAVE_KGDB_GLOBALS(sp)
- SAVE_KGDB_INS(sp)
- SAVE_KGDB_SREGS(sp, l4, l0, l3, l5, l1, l2)
- /* We are increasing PIL, so two writes. */
- or %l0, PSR_PIL, %l0
- wr %l0, 0, %psr
- WRITE_PAUSE
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- call C_LABEL(handle_exception)
- add %sp, REGWIN_SZ, %o0 ! Pass address of registers
- /* Load new kgdb register set. */
- LOAD_KGDB_GLOBALS(sp)
- LOAD_KGDB_INS(sp)
- LOAD_KGDB_SREGS(sp, l4, l0, l3, l5, l1, l2)
- wr %l4, 0x0, %y
- sethi %hi(in_trap_handler), %l4
- ld [%lo(in_trap_handler) + %l4], %l5
- dec %l5
- st %l5, [%lo(in_trap_handler) + %l4]
- add %sp,(16+1+6+1+72)*4,%sp ! Undo the kgdb trap frame.
- /* Now take what kgdb did and place it into the pt_regs
- * frame which SparcLinux RESTORE_ALL understands.,
- */
- STORE_PT_INS(sp)
- STORE_PT_GLOBALS(sp)
- STORE_PT_YREG(sp, g2)
- STORE_PT_PRIV(sp, l0, l1, l2)
- RESTORE_ALL
- #ifdef CONFIG_BLK_DEV_FD
- .text
- .align 4
- .globl C_LABEL(floppy_hardint)
- C_LABEL(floppy_hardint):
- /*
- * This code cannot touch registers %l0 %l1 and %l2
- * because SAVE_ALL depends on their values. It depends
- * on %l3 also, but we regenerate it before a call.
- * Other registers are:
- * %l3 -- base address of fdc registers
- * %l4 -- pdma_vaddr
- * %l5 -- scratch for ld/st address
- * %l6 -- pdma_size
- * %l7 -- scratch [floppy byte, ld/st address, aux. data]
- */
- /* Do we have work to do? */
- sethi %hi(C_LABEL(doing_pdma)), %l7
- ld [%l7 + %lo(C_LABEL(doing_pdma))], %l7
- cmp %l7, 0
- be floppy_dosoftint
- nop
- /* Load fdc register base */
- sethi %hi(C_LABEL(fdc_status)), %l3
- ld [%l3 + %lo(C_LABEL(fdc_status))], %l3
- /* Setup register addresses */
- sethi %hi(C_LABEL(pdma_vaddr)), %l5 ! transfer buffer
- ld [%l5 + %lo(C_LABEL(pdma_vaddr))], %l4
- sethi %hi(C_LABEL(pdma_size)), %l5 ! bytes to go
- ld [%l5 + %lo(C_LABEL(pdma_size))], %l6
- next_byte:
- ldub [%l3], %l7
- andcc %l7, 0x80, %g0 ! Does fifo still have data
- bz floppy_fifo_emptied ! fifo has been emptied...
- andcc %l7, 0x20, %g0 ! in non-dma mode still?
- bz floppy_overrun ! nope, overrun
- andcc %l7, 0x40, %g0 ! 0=write 1=read
- bz floppy_write
- sub %l6, 0x1, %l6
- /* Ok, actually read this byte */
- ldub [%l3 + 1], %l7
- orcc %g0, %l6, %g0
- stb %l7, [%l4]
- bne next_byte
- add %l4, 0x1, %l4
- b floppy_tdone
- nop
- floppy_write:
- /* Ok, actually write this byte */
- ldub [%l4], %l7
- orcc %g0, %l6, %g0
- stb %l7, [%l3 + 1]
- bne next_byte
- add %l4, 0x1, %l4
- /* fall through... */
- floppy_tdone:
- sethi %hi(C_LABEL(pdma_vaddr)), %l5
- st %l4, [%l5 + %lo(C_LABEL(pdma_vaddr))]
- sethi %hi(C_LABEL(pdma_size)), %l5
- st %l6, [%l5 + %lo(C_LABEL(pdma_size))]
- /* Flip terminal count pin */
- set C_LABEL(auxio_register), %l7
- ld [%l7], %l7
- set C_LABEL(sparc_cpu_model), %l5
- ld [%l5], %l5
- subcc %l5, 1, %g0 /* enum { sun4c = 1 }; */
- be 1f
- ldub [%l7], %l5
- or %l5, 0xc2, %l5
- stb %l5, [%l7]
- andn %l5, 0x02, %l5
- b 2f
- nop
- 1:
- or %l5, 0xf4, %l5
- stb %l5, [%l7]
- andn %l5, 0x04, %l5
- 2:
- /* Kill some time so the bits set */
- WRITE_PAUSE
- WRITE_PAUSE
- stb %l5, [%l7]
- /* Prevent recursion */
- sethi %hi(C_LABEL(doing_pdma)), %l7
- b floppy_dosoftint
- st %g0, [%l7 + %lo(C_LABEL(doing_pdma))]
- /* We emptied the FIFO, but we haven't read everything
- * as of yet. Store the current transfer address and
- * bytes left to read so we can continue when the next
- * fast IRQ comes in.
- */
- floppy_fifo_emptied:
- sethi %hi(C_LABEL(pdma_vaddr)), %l5
- st %l4, [%l5 + %lo(C_LABEL(pdma_vaddr))]
- sethi %hi(C_LABEL(pdma_size)), %l7
- st %l6, [%l7 + %lo(C_LABEL(pdma_size))]
- /* Restore condition codes */
- wr %l0, 0x0, %psr
- WRITE_PAUSE
- jmp %l1
- rett %l2
- floppy_overrun:
- sethi %hi(C_LABEL(pdma_vaddr)), %l5
- st %l4, [%l5 + %lo(C_LABEL(pdma_vaddr))]
- sethi %hi(C_LABEL(pdma_size)), %l5
- st %l6, [%l5 + %lo(C_LABEL(pdma_size))]
- /* Prevent recursion */
- sethi %hi(C_LABEL(doing_pdma)), %l7
- st %g0, [%l7 + %lo(C_LABEL(doing_pdma))]
- /* fall through... */
- floppy_dosoftint:
- rd %wim, %l3
- SAVE_ALL
- /* Set all IRQs off. */
- or %l0, PSR_PIL, %l4
- wr %l4, 0x0, %psr
- WRITE_PAUSE
- wr %l4, PSR_ET, %psr
- WRITE_PAUSE
- mov 11, %o0 ! floppy irq level (unused anyway)
- mov %g0, %o1 ! devid is not used in fast interrupts
- call C_LABEL(sparc_floppy_irq)
- add %sp, REGWIN_SZ, %o2 ! struct pt_regs *regs
- RESTORE_ALL
-
- #endif /* (CONFIG_BLK_DEV_FD) */
- /* Bad trap handler */
- .globl bad_trap_handler
- bad_trap_handler:
- SAVE_ALL
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- mov %l7, %o0 ! trap number
- mov %l0, %o1 ! psr
- call C_LABEL(do_hw_interrupt)
- mov %l1, %o2 ! pc
- RESTORE_ALL
-
- /* For now all IRQ's not registered get sent here. handler_irq() will
- * see if a routine is registered to handle this interrupt and if not
- * it will say so on the console.
- */
- .align 4
- .globl real_irq_entry, patch_handler_irq
- real_irq_entry:
- SAVE_ALL
- #ifdef CONFIG_SMP
- .globl patchme_maybe_smp_msg
- cmp %l7, 12
- patchme_maybe_smp_msg:
- bgu maybe_smp4m_msg
- nop
- #endif
- real_irq_continue:
- or %l0, PSR_PIL, %g2
- wr %g2, 0x0, %psr
- WRITE_PAUSE
- wr %g2, PSR_ET, %psr
- WRITE_PAUSE
- mov %l7, %o0 ! irq level
- patch_handler_irq:
- call C_LABEL(handler_irq)
- add %sp, REGWIN_SZ, %o1 ! pt_regs ptr
- or %l0, PSR_PIL, %g2 ! restore PIL after handler_irq
- wr %g2, PSR_ET, %psr ! keep ET up
- WRITE_PAUSE
- RESTORE_ALL
- #ifdef CONFIG_SMP
- /* SMP per-cpu ticker interrupts are handled specially. */
- smp4m_ticker:
- bne real_irq_continue+4
- or %l0, PSR_PIL, %g2
- wr %g2, 0x0, %psr
- WRITE_PAUSE
- wr %g2, PSR_ET, %psr
- WRITE_PAUSE
- call C_LABEL(smp4m_percpu_timer_interrupt)
- add %sp, REGWIN_SZ, %o0
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- RESTORE_ALL
- /* Here is where we check for possible SMP IPI passed to us
- * on some level other than 15 which is the NMI and only used
- * for cross calls. That has a separate entry point below.
- */
- maybe_smp4m_msg:
- GET_PROCESSOR_MID(o3, o2)
- set C_LABEL(sun4m_interrupts), %l5
- ld [%l5], %o5
- sethi %hi(0x60000000), %o4
- sll %o3, 12, %o3
- ld [%o5 + %o3], %o1
- andcc %o1, %o4, %g0
- be,a smp4m_ticker
- cmp %l7, 14
- cmp %l7, 13
- add %o5, %o3, %o5
- bne,a 1f
- sethi %hi(0x40000000), %o2
- sethi %hi(0x20000000), %o2
- 1:
- st %o2, [%o5 + 0x4]
- WRITE_PAUSE
- ld [%o5], %g0
- WRITE_PAUSE
- or %l0, PSR_PIL, %l4
- wr %l4, 0x0, %psr
- WRITE_PAUSE
- wr %l4, PSR_ET, %psr
- WRITE_PAUSE
- cmp %l7, 13
- bne 2f
- nop
- call C_LABEL(smp_reschedule_irq)
- add %o7, 8, %o7
- 2:
- call C_LABEL(smp_stop_cpu_irq)
- nop
- RESTORE_ALL
- .align 4
- .globl linux_trap_ipi15_sun4m
- linux_trap_ipi15_sun4m:
- SAVE_ALL
- sethi %hi(0x80000000), %o2
- GET_PROCESSOR_MID(o0, o1)
- set C_LABEL(sun4m_interrupts), %l5
- ld [%l5], %o5
- sll %o0, 12, %o0
- add %o5, %o0, %o5
- ld [%o5], %o3
- andcc %o3, %o2, %g0
- be 1f ! Must be an NMI async memory error
- st %o2, [%o5 + 4]
- WRITE_PAUSE
- ld [%o5], %g0
- WRITE_PAUSE
- or %l0, PSR_PIL, %l4
- wr %l4, 0x0, %psr
- WRITE_PAUSE
- wr %l4, PSR_ET, %psr
- WRITE_PAUSE
- call C_LABEL(smp4m_cross_call_irq)
- nop
- b ret_trap_lockless_ipi
- clr %l6
- 1:
- /* NMI async memory error handling. */
- sethi %hi(0x80000000), %l4
- sethi %hi(0x4000), %o3
- sub %o5, %o0, %o5
- add %o5, %o3, %l5
- st %l4, [%l5 + 0xc]
- WRITE_PAUSE
- ld [%l5], %g0
- WRITE_PAUSE
- or %l0, PSR_PIL, %l4
- wr %l4, 0x0, %psr
- WRITE_PAUSE
- wr %l4, PSR_ET, %psr
- WRITE_PAUSE
- call C_LABEL(sun4m_nmi)
- nop
- st %l4, [%l5 + 0x8]
- WRITE_PAUSE
- ld [%l5], %g0
- WRITE_PAUSE
- RESTORE_ALL
- .globl smp4d_ticker
- /* SMP per-cpu ticker interrupts are handled specially. */
- smp4d_ticker:
- SAVE_ALL
- or %l0, PSR_PIL, %g2
- sethi %hi(CC_ICLR), %o0
- sethi %hi(1 << 14), %o1
- or %o0, %lo(CC_ICLR), %o0
- stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 14 in MXCC's ICLR */
- wr %g2, 0x0, %psr
- WRITE_PAUSE
- wr %g2, PSR_ET, %psr
- WRITE_PAUSE
- call C_LABEL(smp4d_percpu_timer_interrupt)
- add %sp, REGWIN_SZ, %o0
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- RESTORE_ALL
- .align 4
- .globl linux_trap_ipi15_sun4d
- linux_trap_ipi15_sun4d:
- SAVE_ALL
- sethi %hi(CC_BASE), %o4
- sethi %hi(MXCC_ERR_ME|MXCC_ERR_PEW|MXCC_ERR_ASE|MXCC_ERR_PEE), %o2
- or %o4, (CC_EREG - CC_BASE), %o0
- ldda [%o0] ASI_M_MXCC, %o0
- andcc %o0, %o2, %g0
- bne 1f
- sethi %hi(BB_STAT2), %o2
- lduba [%o2] ASI_M_CTL, %o2
- andcc %o2, BB_STAT2_MASK, %g0
- bne 2f
- or %o4, (CC_ICLR - CC_BASE), %o0
- sethi %hi(1 << 15), %o1
- stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 15 in MXCC's ICLR */
- or %l0, PSR_PIL, %l4
- wr %l4, 0x0, %psr
- WRITE_PAUSE
- wr %l4, PSR_ET, %psr
- WRITE_PAUSE
- call C_LABEL(smp4d_cross_call_irq)
- nop
- b ret_trap_lockless_ipi
- clr %l6
- 1: /* MXCC error */
- 2: /* BB error */
- /* Disable PIL 15 */
- set CC_IMSK, %l4
- lduha [%l4] ASI_M_MXCC, %l5
- sethi %hi(1 << 15), %l7
- or %l5, %l7, %l5
- stha %l5, [%l4] ASI_M_MXCC
- /* FIXME */
- 1: b,a 1b
- #endif /* CONFIG_SMP */
- /* This routine handles illegal instructions and privileged
- * instruction attempts from user code.
- */
- .align 4
- .globl bad_instruction
- bad_instruction:
- sethi %hi(0xc1f80000), %l4
- ld [%l1], %l5
- sethi %hi(0x81d80000), %l7
- and %l5, %l4, %l5
- cmp %l5, %l7
- be 1f
- SAVE_ALL
- wr %l0, PSR_ET, %psr ! re-enable traps
- WRITE_PAUSE
- add %sp, REGWIN_SZ, %o0
- mov %l1, %o1
- mov %l2, %o2
- call C_LABEL(do_illegal_instruction)
- mov %l0, %o3
- RESTORE_ALL
- 1: /* unimplemented flush - just skip */
- jmpl %l2, %g0
- rett %l2 + 4
- .align 4
- .globl priv_instruction
- priv_instruction:
- SAVE_ALL
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- add %sp, REGWIN_SZ, %o0
- mov %l1, %o1
- mov %l2, %o2
- call C_LABEL(do_priv_instruction)
- mov %l0, %o3
- RESTORE_ALL
- /* This routine handles unaligned data accesses. */
- .align 4
- .globl mna_handler
- mna_handler:
- andcc %l0, PSR_PS, %g0
- be mna_fromuser
- nop
- SAVE_ALL
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- ld [%l1], %o1
- call C_LABEL(kernel_unaligned_trap)
- add %sp, REGWIN_SZ, %o0
- RESTORE_ALL
- mna_fromuser:
- SAVE_ALL
- wr %l0, PSR_ET, %psr ! re-enable traps
- WRITE_PAUSE
- ld [%l1], %o1
- call C_LABEL(user_unaligned_trap)
- add %sp, REGWIN_SZ, %o0
- RESTORE_ALL
- /* This routine handles floating point disabled traps. */
- .align 4
- .globl fpd_trap_handler
- fpd_trap_handler:
- SAVE_ALL
- wr %l0, PSR_ET, %psr ! re-enable traps
- WRITE_PAUSE
- add %sp, REGWIN_SZ, %o0
- mov %l1, %o1
- mov %l2, %o2
- call C_LABEL(do_fpd_trap)
- mov %l0, %o3
- RESTORE_ALL
- /* This routine handles Floating Point Exceptions. */
- .align 4
- .globl fpe_trap_handler
- fpe_trap_handler:
- set fpsave_magic, %l5
- cmp %l1, %l5
- be 1f
- sethi %hi(C_LABEL(fpsave)), %l5
- or %l5, %lo(C_LABEL(fpsave)), %l5
- cmp %l1, %l5
- bne 2f
- sethi %hi(fpsave_catch2), %l5
- or %l5, %lo(fpsave_catch2), %l5
- wr %l0, 0x0, %psr
- WRITE_PAUSE
- jmp %l5
- rett %l5 + 4
- 1:
- sethi %hi(fpsave_catch), %l5
- or %l5, %lo(fpsave_catch), %l5
- wr %l0, 0x0, %psr
- WRITE_PAUSE
- jmp %l5
- rett %l5 + 4
- 2:
- SAVE_ALL
- wr %l0, PSR_ET, %psr ! re-enable traps
- WRITE_PAUSE
- add %sp, REGWIN_SZ, %o0
- mov %l1, %o1
- mov %l2, %o2
- call C_LABEL(do_fpe_trap)
- mov %l0, %o3
- RESTORE_ALL
- /* This routine handles Tag Overflow Exceptions. */
- .align 4
- .globl do_tag_overflow
- do_tag_overflow:
- SAVE_ALL
- wr %l0, PSR_ET, %psr ! re-enable traps
- WRITE_PAUSE
- add %sp, REGWIN_SZ, %o0
- mov %l1, %o1
- mov %l2, %o2
- call C_LABEL(handle_tag_overflow)
- mov %l0, %o3
- RESTORE_ALL
- /* This routine handles Watchpoint Exceptions. */
- .align 4
- .globl do_watchpoint
- do_watchpoint:
- SAVE_ALL
- wr %l0, PSR_ET, %psr ! re-enable traps
- WRITE_PAUSE
- add %sp, REGWIN_SZ, %o0
- mov %l1, %o1
- mov %l2, %o2
- call C_LABEL(handle_watchpoint)
- mov %l0, %o3
- RESTORE_ALL
- /* This routine handles Register Access Exceptions. */
- .align 4
- .globl do_reg_access
- do_reg_access:
- SAVE_ALL
- wr %l0, PSR_ET, %psr ! re-enable traps
- WRITE_PAUSE
- add %sp, REGWIN_SZ, %o0
- mov %l1, %o1
- mov %l2, %o2
- call C_LABEL(handle_reg_access)
- mov %l0, %o3
- RESTORE_ALL
- /* This routine handles Co-Processor Disabled Exceptions. */
- .align 4
- .globl do_cp_disabled
- do_cp_disabled:
- SAVE_ALL
- wr %l0, PSR_ET, %psr ! re-enable traps
- WRITE_PAUSE
- add %sp, REGWIN_SZ, %o0
- mov %l1, %o1
- mov %l2, %o2
- call C_LABEL(handle_cp_disabled)
- mov %l0, %o3
- RESTORE_ALL
- /* This routine handles Co-Processor Exceptions. */
- .align 4
- .globl do_cp_exception
- do_cp_exception:
- SAVE_ALL
- wr %l0, PSR_ET, %psr ! re-enable traps
- WRITE_PAUSE
- add %sp, REGWIN_SZ, %o0
- mov %l1, %o1
- mov %l2, %o2
- call C_LABEL(handle_cp_exception)
- mov %l0, %o3
- RESTORE_ALL
- /* This routine handles Hardware Divide By Zero Exceptions. */
- .align 4
- .globl do_hw_divzero
- do_hw_divzero:
- SAVE_ALL
- wr %l0, PSR_ET, %psr ! re-enable traps
- WRITE_PAUSE
- add %sp, REGWIN_SZ, %o0
- mov %l1, %o1
- mov %l2, %o2
- call C_LABEL(handle_hw_divzero)
- mov %l0, %o3
- RESTORE_ALL
- .align 4
- .globl do_flush_windows
- do_flush_windows:
- SAVE_ALL
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- andcc %l0, PSR_PS, %g0
- bne dfw_kernel
- nop
- call C_LABEL(flush_user_windows)
- nop
- /* Advance over the trap instruction. */
- ld [%sp + REGWIN_SZ + PT_NPC], %l1
- add %l1, 0x4, %l2
- st %l1, [%sp + REGWIN_SZ + PT_PC]
- st %l2, [%sp + REGWIN_SZ + PT_NPC]
- RESTORE_ALL
- .globl flush_patch_one
- /* We get these for debugging routines using __builtin_return_address() */
- dfw_kernel:
- flush_patch_one:
- FLUSH_ALL_KERNEL_WINDOWS
- /* Advance over the trap instruction. */
- ld [%sp + REGWIN_SZ + PT_NPC], %l1
- add %l1, 0x4, %l2
- st %l1, [%sp + REGWIN_SZ + PT_PC]
- st %l2, [%sp + REGWIN_SZ + PT_NPC]
- RESTORE_ALL
- /* The getcc software trap. The user wants the condition codes from
- * the %psr in register %g1.
- */
- .align 4
- .globl getcc_trap_handler
- getcc_trap_handler:
- srl %l0, 20, %g1 ! give user
- and %g1, 0xf, %g1 ! only ICC bits in %psr
- jmp %l2 ! advance over trap instruction
- rett %l2 + 0x4 ! like this...
- /* The setcc software trap. The user has condition codes in %g1
- * that it would like placed in the %psr. Be careful not to flip
- * any unintentional bits!
- */
- .align 4
- .globl setcc_trap_handler
- setcc_trap_handler:
- sll %g1, 0x14, %l4
- set PSR_ICC, %l5
- andn %l0, %l5, %l0 ! clear ICC bits in %psr
- and %l4, %l5, %l4 ! clear non-ICC bits in user value
- or %l4, %l0, %l4 ! or them in... mix mix mix
- wr %l4, 0x0, %psr ! set new %psr
- WRITE_PAUSE ! TI scumbags...
- jmp %l2 ! advance over trap instruction
- rett %l2 + 0x4 ! like this...
- .align 4
- .globl linux_trap_nmi_sun4c
- linux_trap_nmi_sun4c:
- SAVE_ALL
- /* Ugh, we need to clear the IRQ line. This is now
- * a very sun4c specific trap handler...
- */
- sethi %hi(C_LABEL(interrupt_enable)), %l5
- ld [%l5 + %lo(C_LABEL(interrupt_enable))], %l5
- ldub [%l5], %l6
- andn %l6, INTS_ENAB, %l6
- stb %l6, [%l5]
- /* Now it is safe to re-enable traps without recursion. */
- or %l0, PSR_PIL, %l0
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- /* Now call the c-code with the pt_regs frame ptr and the
- * memory error registers as arguments. The ordering chosen
- * here is due to unlatching semantics.
- */
- sethi %hi(AC_SYNC_ERR), %o0
- add %o0, 0x4, %o0
- lda [%o0] ASI_CONTROL, %o2 ! sync vaddr
- sub %o0, 0x4, %o0
- lda [%o0] ASI_CONTROL, %o1 ! sync error
- add %o0, 0xc, %o0
- lda [%o0] ASI_CONTROL, %o4 ! async vaddr
- sub %o0, 0x4, %o0
- lda [%o0] ASI_CONTROL, %o3 ! async error
- call C_LABEL(sparc_lvl15_nmi)
- add %sp, REGWIN_SZ, %o0
- RESTORE_ALL
- .align 4
- .globl C_LABEL(invalid_segment_patch1_ff)
- .globl C_LABEL(invalid_segment_patch2_ff)
- C_LABEL(invalid_segment_patch1_ff): cmp %l4, 0xff
- C_LABEL(invalid_segment_patch2_ff): mov 0xff, %l3
- .align 4
- .globl C_LABEL(invalid_segment_patch1_1ff)
- .globl C_LABEL(invalid_segment_patch2_1ff)
- C_LABEL(invalid_segment_patch1_1ff): cmp %l4, 0x1ff
- C_LABEL(invalid_segment_patch2_1ff): mov 0x1ff, %l3
- .align 4
- .globl C_LABEL(num_context_patch1_16), C_LABEL(num_context_patch2_16)
- C_LABEL(num_context_patch1_16): mov 0x10, %l7
- C_LABEL(num_context_patch2_16): mov 0x10, %l7
- .align 4
- .globl C_LABEL(vac_linesize_patch_32)
- C_LABEL(vac_linesize_patch_32): subcc %l7, 32, %l7
- .align 4
- .globl C_LABEL(vac_hwflush_patch1_on), C_LABEL(vac_hwflush_patch2_on)
- /*
- * Ugly, but we cant use hardware flushing on the sun4 and we'd require
- * two instructions (Anton)
- */
- #ifdef CONFIG_SUN4
- C_LABEL(vac_hwflush_patch1_on): nop
- #else
- C_LABEL(vac_hwflush_patch1_on): addcc %l7, -PAGE_SIZE, %l7
- #endif
- C_LABEL(vac_hwflush_patch2_on): sta %g0, [%l3 + %l7] ASI_HWFLUSHSEG
- .globl C_LABEL(invalid_segment_patch1), C_LABEL(invalid_segment_patch2)
- .globl C_LABEL(num_context_patch1), C_LABEL(num_context_patch2)
- .globl C_LABEL(vac_linesize_patch), C_LABEL(vac_hwflush_patch1)
- .globl C_LABEL(vac_hwflush_patch2)
- .align 4
- .globl sun4c_fault
- ! %l0 = %psr
- ! %l1 = %pc
- ! %l2 = %npc
- ! %l3 = %wim
- ! %l7 = 1 for textfault
- ! We want error in %l5, vaddr in %l6
- sun4c_fault:
- #ifdef CONFIG_SUN4
- sethi %hi(C_LABEL(sun4c_memerr_reg)), %l4
- ld [%l4+%lo(C_LABEL(sun4c_memerr_reg))], %l4 ! memerr ctrl reg addr
- ld [%l4], %l6 ! memerr ctrl reg
- ld [%l4 + 4], %l5 ! memerr vaddr reg
- andcc %l6, 0x80, %g0 ! check for error type
- st %g0, [%l4 + 4] ! clear the error
- be 0f ! normal error
- sethi %hi(AC_BUS_ERROR), %l4 ! bus err reg addr
- call C_LABEL(prom_halt) ! something weird happened
- ! what exactly did happen?
- ! what should we do here?
- 0: or %l4, %lo(AC_BUS_ERROR), %l4 ! bus err reg addr
- lduba [%l4] ASI_CONTROL, %l6 ! bus err reg
- cmp %l7, 1 ! text fault?
- be 1f ! yes
- nop
- ld [%l1], %l4 ! load instruction that caused fault
- srl %l4, 21, %l4
- andcc %l4, 1, %g0 ! store instruction?
- be 1f ! no
- sethi %hi(SUN4C_SYNC_BADWRITE), %l4 ! yep
- ! %lo(SUN4C_SYNC_BADWRITE) = 0
- or %l4, %l6, %l6 ! set write bit to emulate sun4c
- 1:
- #else
- sethi %hi(AC_SYNC_ERR), %l4
- add %l4, 0x4, %l6 ! AC_SYNC_VA in %l6
- lda [%l6] ASI_CONTROL, %l5 ! Address
- lda [%l4] ASI_CONTROL, %l6 ! Error, retained for a bit
- #endif
- andn %l5, 0xfff, %l5 ! Encode all info into l7
- srl %l6, 14, %l4
- and %l4, 2, %l4
- or %l5, %l4, %l4
- or %l4, %l7, %l7 ! l7 = [addr,write,txtfault]
- andcc %l0, PSR_PS, %g0
- be sun4c_fault_fromuser
- andcc %l7, 1, %g0 ! Text fault?
- be 1f
- sethi %hi(KERNBASE), %l4
- mov %l1, %l5 ! PC
- 1:
- cmp %l5, %l4
- blu sun4c_fault_fromuser
- sethi %hi(~((1 << SUN4C_REAL_PGDIR_SHIFT) - 1)), %l4
- /* If the kernel references a bum kernel pointer, or a pte which
- * points to a non existant page in ram, we will run this code
- * _forever_ and lock up the machine!!!!! So we must check for
- * this condition, the AC_SYNC_ERR bits are what we must examine.
- * Also a parity error would make this happen as well. So we just
- * check that we are in fact servicing a tlb miss and not some
- * other type of fault for the kernel.
- */
- andcc %l6, 0x80, %g0
- be sun4c_fault_fromuser
- and %l5, %l4, %l5
- /* Test for NULL pte_t * in vmalloc area. */
- sethi %hi(VMALLOC_START), %l4
- cmp %l5, %l4
- blu,a C_LABEL(invalid_segment_patch1)
- lduXa [%l5] ASI_SEGMAP, %l4
- sethi %hi(C_LABEL(swapper_pg_dir)), %l4
- srl %l5, SUN4C_PGDIR_SHIFT, %l6
- or %l4, %lo(C_LABEL(swapper_pg_dir)), %l4
- sll %l6, 2, %l6
- ld [%l4 + %l6], %l4
- #ifdef CONFIG_SUN4
- sethi %hi(PAGE_MASK), %l6
- andcc %l4, %l6, %g0
- #else
- andcc %l4, PAGE_MASK, %g0
- #endif
- be sun4c_fault_fromuser
- lduXa [%l5] ASI_SEGMAP, %l4
- C_LABEL(invalid_segment_patch1):
- cmp %l4, 0x7f
- bne 1f
- sethi %hi(C_LABEL(sun4c_kfree_ring)), %l4
- or %l4, %lo(C_LABEL(sun4c_kfree_ring)), %l4
- ld [%l4 + 0x18], %l3
- deccc %l3 ! do we have a free entry?
- bcs,a 2f ! no, unmap one.
- sethi %hi(C_LABEL(sun4c_kernel_ring)), %l4
- st %l3, [%l4 + 0x18] ! sun4c_kfree_ring.num_entries--
- ld [%l4 + 0x00], %l6 ! entry = sun4c_kfree_ring.ringhd.next
- st %l5, [%l6 + 0x08] ! entry->vaddr = address
- ld [%l6 + 0x00], %l3 ! next = entry->next
- ld [%l6 + 0x04], %l7 ! entry->prev
- st %l7, [%l3 + 0x04] ! next->prev = entry->prev
- st %l3, [%l7 + 0x00] ! entry->prev->next = next
- sethi %hi(C_LABEL(sun4c_kernel_ring)), %l4
- or %l4, %lo(C_LABEL(sun4c_kernel_ring)), %l4
- ! head = &sun4c_kernel_ring.ringhd
- ld [%l4 + 0x00], %l7 ! head->next
- st %l4, [%l6 + 0x04] ! entry->prev = head
- st %l7, [%l6 + 0x00] ! entry->next = head->next
- st %l6, [%l7 + 0x04] ! head->next->prev = entry
- st %l6, [%l4 + 0x00] ! head->next = entry
- ld [%l4 + 0x18], %l3
- inc %l3 ! sun4c_kernel_ring.num_entries++
- st %l3, [%l4 + 0x18]
- b 4f
- ld [%l6 + 0x08], %l5
- 2:
- or %l4, %lo(C_LABEL(sun4c_kernel_ring)), %l4
- ! head = &sun4c_kernel_ring.ringhd
- ld [%l4 + 0x04], %l6 ! entry = head->prev
- ld [%l6 + 0x08], %l3 ! tmp = entry->vaddr
- ! Flush segment from the cache.
- #ifdef CONFIG_SUN4
- sethi %hi((128 * 1024)), %l7
- #else
- sethi %hi((64 * 1024)), %l7
- #endif
- 9:
- C_LABEL(vac_hwflush_patch1):
- C_LABEL(vac_linesize_patch):
- subcc %l7, 16, %l7
- bne 9b
- C_LABEL(vac_hwflush_patch2):
- sta %g0, [%l3 + %l7] ASI_FLUSHSEG
- st %l5, [%l6 + 0x08] ! entry->vaddr = address
- ld [%l6 + 0x00], %l5 ! next = entry->next
- ld [%l6 + 0x04], %l7 ! entry->prev
- st %l7, [%l5 + 0x04] ! next->prev = entry->prev
- st %l5, [%l7 + 0x00] ! entry->prev->next = next
- st %l4, [%l6 + 0x04] ! entry->prev = head
- ld [%l4 + 0x00], %l7 ! head->next
- st %l7, [%l6 + 0x00] ! entry->next = head->next
- st %l6, [%l7 + 0x04] ! head->next->prev = entry
- st %l6, [%l4 + 0x00] ! head->next = entry
- mov %l3, %l5 ! address = tmp
- 4:
- C_LABEL(num_context_patch1):
- mov 0x08, %l7
- ld [%l6 + 0x08], %l4
- ldub [%l6 + 0x0c], %l3
- or %l4, %l3, %l4 ! encode new vaddr/pseg into l4
- sethi %hi(AC_CONTEXT), %l3
- lduba [%l3] ASI_CONTROL, %l6
- /* Invalidate old mapping, instantiate new mapping,
- * for each context. Registers l6/l7 are live across
- * this loop.
- */
- 3: deccc %l7
- sethi %hi(AC_CONTEXT), %l3
- stba %l7, [%l3] ASI_CONTROL
- C_LABEL(invalid_segment_patch2):
- mov 0x7f, %l3
- stXa %l3, [%l5] ASI_SEGMAP
- andn %l4, 0x1ff, %l3
- bne 3b
- stXa %l4, [%l3] ASI_SEGMAP
- sethi %hi(AC_CONTEXT), %l3
- stba %l6, [%l3] ASI_CONTROL
- andn %l4, 0x1ff, %l5
- 1:
- sethi %hi(VMALLOC_START), %l4
- cmp %l5, %l4
- bgeu 1f
- mov 1 << (SUN4C_REAL_PGDIR_SHIFT - PAGE_SHIFT), %l7
- sethi %hi(KERNBASE), %l6
- sub %l5, %l6, %l4
- srl %l4, PAGE_SHIFT, %l4
- sethi %hi((SUN4C_PAGE_KERNEL & 0xf4000000)), %l3
- or %l3, %l4, %l3
- sethi %hi(PAGE_SIZE), %l4
- 2:
- sta %l3, [%l5] ASI_PTE
- deccc %l7
- inc %l3
- bne 2b
- add %l5, %l4, %l5
- b 7f
- sethi %hi(C_LABEL(sun4c_kernel_faults)), %l4
- 1:
- srl %l5, SUN4C_PGDIR_SHIFT, %l3
- sethi %hi(C_LABEL(swapper_pg_dir)), %l4
- or %l4, %lo(C_LABEL(swapper_pg_dir)), %l4
- sll %l3, 2, %l3
- ld [%l4 + %l3], %l4
- #ifndef CONFIG_SUN4
- and %l4, PAGE_MASK, %l4
- #else
- sethi %hi(PAGE_MASK), %l6
- and %l4, %l6, %l4
- #endif
- srl %l5, (PAGE_SHIFT - 2), %l6
- and %l6, ((SUN4C_PTRS_PER_PTE - 1) << 2), %l6
- add %l6, %l4, %l6
- sethi %hi(PAGE_SIZE), %l4
- 2:
- ld [%l6], %l3
- deccc %l7
- sta %l3, [%l5] ASI_PTE
- add %l6, 0x4, %l6
- bne 2b
- add %l5, %l4, %l5
- sethi %hi(C_LABEL(sun4c_kernel_faults)), %l4
- 7:
- ld [%l4 + %lo(C_LABEL(sun4c_kernel_faults))], %l3
- inc %l3
- st %l3, [%l4 + %lo(C_LABEL(sun4c_kernel_faults))]
- /* Restore condition codes */
- wr %l0, 0x0, %psr
- WRITE_PAUSE
- jmp %l1
- rett %l2
- sun4c_fault_fromuser:
- SAVE_ALL
- nop
-
- mov %l7, %o1 ! Decode the info from %l7
- mov %l7, %o2
- and %o1, 1, %o1 ! arg2 = text_faultp
- mov %l7, %o3
- and %o2, 2, %o2 ! arg3 = writep
- andn %o3, 0xfff, %o3 ! arg4 = faulting address
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- call C_LABEL(do_sun4c_fault)
- add %sp, REGWIN_SZ, %o0 ! arg1 = pt_regs ptr
- RESTORE_ALL
- .align 4
- .globl C_LABEL(srmmu_fault)
- C_LABEL(srmmu_fault):
- mov 0x400, %l5
- mov 0x300, %l4
- lda [%l5] ASI_M_MMUREGS, %l6 ! read sfar first
- lda [%l4] ASI_M_MMUREGS, %l5 ! read sfsr last
- andn %l6, 0xfff, %l6
- srl %l5, 6, %l5 ! and encode all info into l7
- and %l5, 2, %l5
- or %l5, %l6, %l6
- or %l6, %l7, %l7 ! l7 = [addr,write,txtfault]
- SAVE_ALL
- mov %l7, %o1
- mov %l7, %o2
- and %o1, 1, %o1 ! arg2 = text_faultp
- mov %l7, %o3
- and %o2, 2, %o2 ! arg3 = writep
- andn %o3, 0xfff, %o3 ! arg4 = faulting address
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- call C_LABEL(do_sparc_fault)
- add %sp, REGWIN_SZ, %o0 ! arg1 = pt_regs ptr
- RESTORE_ALL
- #ifdef CONFIG_SUNOS_EMUL
- /* SunOS uses syscall zero as the 'indirect syscall' it looks
- * like indir_syscall(scall_num, arg0, arg1, arg2...); etc.
- * This is complete brain damage.
- */
- .globl C_LABEL(sunos_indir)
- C_LABEL(sunos_indir):
- mov %o7, %l4
- cmp %o0, NR_SYSCALLS
- blu,a 1f
- sll %o0, 0x2, %o0
- sethi %hi(C_LABEL(sunos_nosys)), %l6
- b 2f
- or %l6, %lo(C_LABEL(sunos_nosys)), %l6
- 1:
- set C_LABEL(sunos_sys_table), %l7
- ld [%l7 + %o0], %l6
- 2:
- mov %o1, %o0
- mov %o2, %o1
- mov %o3, %o2
- mov %o4, %o3
- mov %o5, %o4
- call %l6
- mov %l4, %o7
- #endif
- .align 4
- .globl C_LABEL(sys_nis_syscall)
- C_LABEL(sys_nis_syscall):
- mov %o7, %l5
- add %sp, REGWIN_SZ, %o0 ! pt_regs *regs arg
- call C_LABEL(c_sys_nis_syscall)
- mov %l5, %o7
- .align 4
- .globl C_LABEL(sys_ptrace)
- C_LABEL(sys_ptrace):
- call C_LABEL(do_ptrace)
- add %sp, REGWIN_SZ, %o0
- ld [%curptr + AOFF_task_ptrace], %l5
- andcc %l5, 0x02, %g0
- be 1f
- nop
- call C_LABEL(syscall_trace)
- nop
- 1:
- RESTORE_ALL
- .align 4
- .globl C_LABEL(sys_execve)
- C_LABEL(sys_execve):
- mov %o7, %l5
- add %sp, REGWIN_SZ, %o0 ! pt_regs *regs arg
- call C_LABEL(sparc_execve)
- mov %l5, %o7
- .align 4
- .globl C_LABEL(sys_pipe)
- C_LABEL(sys_pipe):
- mov %o7, %l5
- add %sp, REGWIN_SZ, %o0 ! pt_regs *regs arg
- call C_LABEL(sparc_pipe)
- mov %l5, %o7
- .align 4
- .globl C_LABEL(sys_sigaltstack)
- C_LABEL(sys_sigaltstack):
- mov %o7, %l5
- mov %fp, %o2
- call C_LABEL(do_sigaltstack)
- mov %l5, %o7
- .align 4
- .globl C_LABEL(sys_sigstack)
- C_LABEL(sys_sigstack):
- mov %o7, %l5
- mov %fp, %o2
- call C_LABEL(do_sys_sigstack)
- mov %l5, %o7
- .align 4
- .globl C_LABEL(sys_sigpause)
- C_LABEL(sys_sigpause):
- /* Note: %o0 already has correct value... */
- call C_LABEL(do_sigpause)
- add %sp, REGWIN_SZ, %o1
- ld [%curptr + AOFF_task_ptrace], %l5
- andcc %l5, 0x02, %g0
- be 1f
- nop
- call C_LABEL(syscall_trace)
- nop
- 1:
- /* We are returning to a signal handler. */
- RESTORE_ALL
- .align 4
- .globl C_LABEL(sys_sigsuspend)
- C_LABEL(sys_sigsuspend):
- call C_LABEL(do_sigsuspend)
- add %sp, REGWIN_SZ, %o0
- ld [%curptr + AOFF_task_ptrace], %l5
- andcc %l5, 0x02, %g0
- be 1f
- nop
- call C_LABEL(syscall_trace)
- nop
- 1:
- /* We are returning to a signal handler. */
- RESTORE_ALL
- .align 4
- .globl C_LABEL(sys_rt_sigsuspend)
- C_LABEL(sys_rt_sigsuspend):
- /* Note: %o0, %o1 already have correct value... */
- call C_LABEL(do_rt_sigsuspend)
- add %sp, REGWIN_SZ, %o2
- ld [%curptr + AOFF_task_ptrace], %l5
- andcc %l5, 0x02, %g0
- be 1f
- nop
- call C_LABEL(syscall_trace)
- nop
- 1:
- /* We are returning to a signal handler. */
- RESTORE_ALL
- .align 4
- .globl C_LABEL(sys_sigreturn)
- C_LABEL(sys_sigreturn):
- call C_LABEL(do_sigreturn)
- add %sp, REGWIN_SZ, %o0
- ld [%curptr + AOFF_task_ptrace], %l5
- andcc %l5, 0x02, %g0
- be 1f
- nop
- call C_LABEL(syscall_trace)
- nop
- 1:
- /* We don't want to muck with user registers like a
- * normal syscall, just return.
- */
- RESTORE_ALL
- .align 4
- .globl C_LABEL(sys_rt_sigreturn)
- C_LABEL(sys_rt_sigreturn):
- call C_LABEL(do_rt_sigreturn)
- add %sp, REGWIN_SZ, %o0
- ld [%curptr + AOFF_task_ptrace], %l5
- andcc %l5, 0x02, %g0
- be 1f
- nop
- call C_LABEL(syscall_trace)
- nop
- 1:
- /* We are returning to a signal handler. */
- RESTORE_ALL
- /* Now that we have a real sys_clone, sys_fork() is
- * implemented in terms of it. Our _real_ implementation
- * of SunOS vfork() will use sys_vfork().
- *
- * XXX These three should be consolidated into mostly shared
- * XXX code just like on sparc64... -DaveM
- */
- .align 4
- .globl C_LABEL(sys_fork), flush_patch_two
- C_LABEL(sys_fork):
- mov %o7, %l5
- flush_patch_two:
- FLUSH_ALL_KERNEL_WINDOWS;
- rd %psr, %g4
- WRITE_PAUSE
- mov SIGCHLD, %o0 ! arg0: clone flags
- rd %wim, %g5
- WRITE_PAUSE
- mov %fp, %o1 ! arg1: usp
- std %g4, [%curptr + AOFF_task_thread + AOFF_thread_fork_kpsr]
- add %sp, REGWIN_SZ, %o2 ! arg2: pt_regs ptr
- mov 0, %o3
- call C_LABEL(do_fork)
- mov %l5, %o7
-
- /* Whee, kernel threads! */
- .globl C_LABEL(sys_clone), flush_patch_three
- C_LABEL(sys_clone):
- mov %o7, %l5
- flush_patch_three:
- FLUSH_ALL_KERNEL_WINDOWS;
- rd %psr, %g4
- WRITE_PAUSE
- /* arg0,1: flags,usp -- loaded already */
- cmp %o1, 0x0 ! Is new_usp NULL?
- rd %wim, %g5
- WRITE_PAUSE
- be,a 1f
- mov %fp, %o1 ! yes, use callers usp
- andn %o1, 7, %o1 ! no, align to 8 bytes
- 1:
- std %g4, [%curptr + AOFF_task_thread + AOFF_thread_fork_kpsr]
- add %sp, REGWIN_SZ, %o2 ! arg2: pt_regs ptr
- mov 0, %o3
- call C_LABEL(do_fork)
- mov %l5, %o7
- /* Whee, real vfork! */
- .globl C_LABEL(sys_vfork), flush_patch_four
- C_LABEL(sys_vfork):
- flush_patch_four:
- FLUSH_ALL_KERNEL_WINDOWS;
- rd %psr, %g4
- WRITE_PAUSE
- rd %wim, %g5
- WRITE_PAUSE
- std %g4, [%curptr + AOFF_task_thread + AOFF_thread_fork_kpsr]
- sethi %hi(0x4000 | 0x0100 | SIGCHLD), %o0
- mov %fp, %o1
- or %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0
- sethi %hi(C_LABEL(do_fork)), %l1
- mov 0, %o3
- jmpl %l1 + %lo(C_LABEL(do_fork)), %g0
- add %sp, REGWIN_SZ, %o2
- .align 4
- linux_sparc_ni_syscall:
- sethi %hi(C_LABEL(sys_ni_syscall)), %l7
- b syscall_is_too_hard
- or %l7, %lo(C_LABEL(sys_ni_syscall)), %l7
- linux_fast_syscall:
- andn %l7, 3, %l7
- mov %i0, %o0
- mov %i1, %o1
- mov %i2, %o2
- jmpl %l7 + %g0, %g0
- mov %i3, %o3
- linux_syscall_trace:
- call C_LABEL(syscall_trace)
- nop
- mov %i0, %o0
- mov %i1, %o1
- mov %i2, %o2
- mov %i3, %o3
- b 2f
- mov %i4, %o4
- .globl C_LABEL(ret_from_fork)
- C_LABEL(ret_from_fork):
- call schedule_tail
- mov %g3, %o0
- b C_LABEL(ret_sys_call)
- ld [%sp + REGWIN_SZ + PT_I0], %o0
- /* Linux native and SunOS system calls enter here... */
- .align 4
- .globl linux_sparc_syscall
- linux_sparc_syscall:
- /* Direct access to user regs, must faster. */
- cmp %g1, NR_SYSCALLS
- bgeu linux_sparc_ni_syscall
- sll %g1, 2, %l4
- ld [%l7 + %l4], %l7
- andcc %l7, 1, %g0
- bne linux_fast_syscall
- /* Just do first insn from SAVE_ALL in the delay slot */
- .globl syscall_is_too_hard
- syscall_is_too_hard:
- SAVE_ALL_HEAD
- rd %wim, %l3
- wr %l0, PSR_ET, %psr
- mov %i0, %o0
- mov %i1, %o1
- mov %i2, %o2
- ld [%curptr + AOFF_task_ptrace], %l5
- mov %i3, %o3
- andcc %l5, 0x02, %g0
- mov %i4, %o4
- bne linux_syscall_trace
- mov %i0, %l5
- 2:
- call %l7
- mov %i5, %o5
- st %o0, [%sp + REGWIN_SZ + PT_I0]
- .globl C_LABEL(ret_sys_call)
- C_LABEL(ret_sys_call):
- ld [%curptr + AOFF_task_ptrace], %l6
- cmp %o0, -ENOIOCTLCMD
- ld [%sp + REGWIN_SZ + PT_PSR], %g3
- set PSR_C, %g2
- bgeu 1f
- andcc %l6, 0x02, %l6
- /* System call success, clear Carry condition code. */
- andn %g3, %g2, %g3
- clr %l6
- st %g3, [%sp + REGWIN_SZ + PT_PSR]
- bne linux_syscall_trace2
- ld [%sp + REGWIN_SZ + PT_NPC], %l1 /* pc = npc */
- add %l1, 0x4, %l2 /* npc = npc+4 */
- st %l1, [%sp + REGWIN_SZ + PT_PC]
- b ret_trap_entry
- st %l2, [%sp + REGWIN_SZ + PT_NPC]
- 1:
- /* System call failure, set Carry condition code.
- * Also, get abs(errno) to return to the process.
- */
- sub %g0, %o0, %o0
- or %g3, %g2, %g3
- st %o0, [%sp + REGWIN_SZ + PT_I0]
- mov 1, %l6
- st %g3, [%sp + REGWIN_SZ + PT_PSR]
- bne linux_syscall_trace2
- ld [%sp + REGWIN_SZ + PT_NPC], %l1 /* pc = npc */
- add %l1, 0x4, %l2 /* npc = npc+4 */
- st %l1, [%sp + REGWIN_SZ + PT_PC]
- b ret_trap_entry
- st %l2, [%sp + REGWIN_SZ + PT_NPC]
- linux_syscall_trace2:
- call C_LABEL(syscall_trace)
- add %l1, 0x4, %l2 /* npc = npc+4 */
- st %l1, [%sp + REGWIN_SZ + PT_PC]
- b ret_trap_entry
- st %l2, [%sp + REGWIN_SZ + PT_NPC]
- /*
- * Solaris system calls and indirect system calls enter here.
- *
- * I have named the solaris indirect syscalls like that because
- * it seems like Solaris has some fast path syscalls that can
- * be handled as indirect system calls. - mig
- */
- linux_syscall_for_solaris:
- sethi %hi(sys_call_table), %l7
- b linux_sparc_syscall
- or %l7, %lo(sys_call_table), %l7
-
- .align 4
- .globl solaris_syscall
- solaris_syscall:
- cmp %g1,59
- be linux_syscall_for_solaris
- cmp %g1,2
- be linux_syscall_for_solaris
- cmp %g1,42
- be linux_syscall_for_solaris
- cmp %g1,119
- be,a linux_syscall_for_solaris
- mov 2, %g1
- 1:
- SAVE_ALL_HEAD
- rd %wim, %l3
- wr %l0, PSR_ET, %psr
- nop
- nop
- mov %i0, %l5
- call C_LABEL(do_solaris_syscall)
- add %sp, REGWIN_SZ, %o0
- st %o0, [%sp + REGWIN_SZ + PT_I0]
- set PSR_C, %g2
- cmp %o0, -ENOIOCTLCMD
- bgeu 1f
- ld [%sp + REGWIN_SZ + PT_PSR], %g3
- /* System call success, clear Carry condition code. */
- andn %g3, %g2, %g3
- clr %l6
- b 2f
- st %g3, [%sp + REGWIN_SZ + PT_PSR]
- 1:
- /* System call failure, set Carry condition code.
- * Also, get abs(errno) to return to the process.
- */
- sub %g0, %o0, %o0
- mov 1, %l6
- st %o0, [%sp + REGWIN_SZ + PT_I0]
- or %g3, %g2, %g3
- st %g3, [%sp + REGWIN_SZ + PT_PSR]
- /* Advance the pc and npc over the trap instruction.
- * If the npc is unaligned (has a 1 in the lower byte), it means
- * the kernel does not want us to play magic (ie, skipping over
- * traps). Mainly when the Solaris code wants to set some PC and
- * nPC (setcontext).
- */
- 2:
- ld [%sp + REGWIN_SZ + PT_NPC], %l1 /* pc = npc */
- andcc %l1, 1, %g0
- bne 1f
- add %l1, 0x4, %l2 /* npc = npc+4 */
- st %l1, [%sp + REGWIN_SZ + PT_PC]
- b ret_trap_entry
- st %l2, [%sp + REGWIN_SZ + PT_NPC]
- /* kernel knows what it is doing, fixup npc and continue */
- 1:
- sub %l1, 1, %l1
- b ret_trap_entry
- st %l1, [%sp + REGWIN_SZ + PT_NPC]
- #ifndef CONFIG_SUNOS_EMUL
- .align 4
- .globl sunos_syscall
- sunos_syscall:
- SAVE_ALL_HEAD
- rd %wim, %l3
- wr %l0, PSR_ET, %psr
- nop
- nop
- mov %i0, %l5
- call C_LABEL(do_sunos_syscall)
- add %sp, REGWIN_SZ, %o0
- #endif
- /* {net, open}bsd system calls enter here... */
- .align 4
- .globl bsd_syscall
- bsd_syscall:
- /* Direct access to user regs, must faster. */
- cmp %g1, NR_SYSCALLS
- blu,a 1f
- sll %g1, 2, %l4
- set C_LABEL(sys_ni_syscall), %l7
- b bsd_is_too_hard
- nop
- 1:
- ld [%l7 + %l4], %l7
- .globl bsd_is_too_hard
- bsd_is_too_hard:
- rd %wim, %l3
- SAVE_ALL
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- 2:
- mov %i0, %o0
- mov %i1, %o1
- mov %i2, %o2
- mov %i0, %l5
- mov %i3, %o3
- mov %i4, %o4
- call %l7
- mov %i5, %o5
- st %o0, [%sp + REGWIN_SZ + PT_I0]
- set PSR_C, %g2
- cmp %o0, -ENOIOCTLCMD
- bgeu 1f
- ld [%sp + REGWIN_SZ + PT_PSR], %g3
- /* System call success, clear Carry condition code. */
- andn %g3, %g2, %g3
- clr %l6
- b 2f
- st %g3, [%sp + REGWIN_SZ + PT_PSR]
- 1:
- /* System call failure, set Carry condition code.
- * Also, get abs(errno) to return to the process.
- */
- sub %g0, %o0, %o0
- #if 0 /* XXX todo XXX */
- sethi %hi(C_LABEL(bsd_xlatb_rorl), %o3
- or %o3, %lo(C_LABEL(bsd_xlatb_rorl)), %o3
- sll %o0, 2, %o0
- ld [%o3 + %o0], %o0
- #endif
- mov 1, %l6
- st %o0, [%sp + REGWIN_SZ + PT_I0]
- or %g3, %g2, %g3
- st %g3, [%sp + REGWIN_SZ + PT_PSR]
- /* Advance the pc and npc over the trap instruction. */
- 2:
- ld [%sp + REGWIN_SZ + PT_NPC], %l1 /* pc = npc */
- add %l1, 0x4, %l2 /* npc = npc+4 */
- st %l1, [%sp + REGWIN_SZ + PT_PC]
- b ret_trap_entry
- st %l2, [%sp + REGWIN_SZ + PT_NPC]
- /* Saving and restoring the FPU state is best done from lowlevel code.
- *
- * void fpsave(unsigned long *fpregs, unsigned long *fsr,
- * void *fpqueue, unsigned long *fpqdepth)
- */
- .globl C_LABEL(fpsave)
- C_LABEL(fpsave):
- st %fsr, [%o1] ! this can trap on us if fpu is in bogon state
- ld [%o1], %g1
- set 0x2000, %g4
- andcc %g1, %g4, %g0
- be 2f
- mov 0, %g2
- /* We have an fpqueue to save. */
- 1:
- std %fq, [%o2]
- fpsave_magic:
- st %fsr, [%o1]
- ld [%o1], %g3
- andcc %g3, %g4, %g0
- add %g2, 1, %g2
- bne 1b
- add %o2, 8, %o2
- 2:
- st %g2, [%o3]
- std %f0, [%o0 + 0x00]
- std %f2, [%o0 + 0x08]
- std %f4, [%o0 + 0x10]
- std %f6, [%o0 + 0x18]
- std %f8, [%o0 + 0x20]
- std %f10, [%o0 + 0x28]
- std %f12, [%o0 + 0x30]
- std %f14, [%o0 + 0x38]
- std %f16, [%o0 + 0x40]
- std %f18, [%o0 + 0x48]
- std %f20, [%o0 + 0x50]
- std %f22, [%o0 + 0x58]
- std %f24, [%o0 + 0x60]
- std %f26, [%o0 + 0x68]
- std %f28, [%o0 + 0x70]
- retl
- std %f30, [%o0 + 0x78]
- /* Thanks for Theo Deraadt and the authors of the Sprite/netbsd/openbsd
- * code for pointing out this possible deadlock, while we save state
- * above we could trap on the fsr store so our low level fpu trap
- * code has to know how to deal with this.
- */
- fpsave_catch:
- b fpsave_magic + 4
- st %fsr, [%o1]
- fpsave_catch2:
- b C_LABEL(fpsave) + 4
- st %fsr, [%o1]
- /* void fpload(unsigned long *fpregs, unsigned long *fsr); */
- .globl C_LABEL(fpload)
- C_LABEL(fpload):
- ldd [%o0 + 0x00], %f0
- ldd [%o0 + 0x08], %f2
- ldd [%o0 + 0x10], %f4
- ldd [%o0 + 0x18], %f6
- ldd [%o0 + 0x20], %f8
- ldd [%o0 + 0x28], %f10
- ldd [%o0 + 0x30], %f12
- ldd [%o0 + 0x38], %f14
- ldd [%o0 + 0x40], %f16
- ldd [%o0 + 0x48], %f18
- ldd [%o0 + 0x50], %f20
- ldd [%o0 + 0x58], %f22
- ldd [%o0 + 0x60], %f24
- ldd [%o0 + 0x68], %f26
- ldd [%o0 + 0x70], %f28
- ldd [%o0 + 0x78], %f30
- ld [%o1], %fsr
- retl
- nop
- .globl C_LABEL(udelay)
- C_LABEL(udelay):
- save %sp, -REGWIN_SZ, %sp
- mov %i0, %o0
- sethi %hi(0x10c6), %o1
- call .umul
- or %o1, %lo(0x10c6), %o1
- #ifndef CONFIG_SMP
- sethi %hi(C_LABEL(loops_per_jiffy)), %o3
- call .umul
- ld [%o3 + %lo(C_LABEL(loops_per_jiffy))], %o1
- #else
- GET_PROCESSOR_OFFSET(o4, o2)
- set C_LABEL(cpu_data), %o3
- call .umul
- ld [%o3 + %o4], %o1
- #endif
- call .umul
- mov 100, %o0
- cmp %o0, 0x0
- 1:
- bne 1b
- subcc %o0, 1, %o0
-
- ret
- restore
- /* Handle a software breakpoint */
- /* We have to inform parent that child has stopped */
- .align 4
- .globl breakpoint_trap
- breakpoint_trap:
- rd %wim,%l3
- SAVE_ALL
- wr %l0, PSR_ET, %psr
- WRITE_PAUSE
- st %i0, [%sp + REGWIN_SZ + PT_G0] ! for restarting syscalls
- call C_LABEL(sparc_breakpoint)
- add %sp, REGWIN_SZ, %o0
- RESTORE_ALL
- .align 4
- .globl C_LABEL(__handle_exception), flush_patch_exception
- C_LABEL(__handle_exception):
- flush_patch_exception:
- FLUSH_ALL_KERNEL_WINDOWS;
- ldd [%o0], %o6
- jmpl %o7 + 0xc, %g0 ! see asm-sparc/processor.h
- mov 1, %g1 ! signal EFAULT condition
- .align 4
- .globl C_LABEL(kill_user_windows), kuw_patch1_7win
- .globl kuw_patch1
- kuw_patch1_7win: sll %o3, 6, %o3
- /* No matter how much overhead this routine has in the worst
- * case scenerio, it is several times better than taking the
- * traps with the old method of just doing flush_user_windows().
- */
- C_LABEL(kill_user_windows):
- ld [%g6 + AOFF_task_thread + AOFF_thread_uwinmask], %o0 ! get current umask
- orcc %g0, %o0, %g0 ! if no bits set, we are done
- be 3f ! nothing to do
- rd %psr, %o5 ! must clear interrupts
- or %o5, PSR_PIL, %o4 ! or else that could change
- wr %o4, 0x0, %psr ! the uwinmask state
- WRITE_PAUSE ! burn them cycles
- 1:
- ld [%g6 + AOFF_task_thread + AOFF_thread_uwinmask], %o0 ! get consistant state
- orcc %g0, %o0, %g0 ! did an interrupt come in?
- be 4f ! yep, we are done
- rd %wim, %o3 ! get current wim
- srl %o3, 1, %o4 ! simulate a save
- kuw_patch1:
- sll %o3, 7, %o3 ! compute next wim
- or %o4, %o3, %o3 ! result
- andncc %o0, %o3, %o0 ! clean this bit in umask
- bne kuw_patch1 ! not done yet
- srl %o3, 1, %o4 ! begin another save simulation
- wr %o3, 0x0, %wim ! set the new wim
- st %g0, [%g6 + AOFF_task_thread + AOFF_thread_uwinmask] ! clear uwinmask
- 4:
- wr %o5, 0x0, %psr ! re-enable interrupts
- WRITE_PAUSE ! burn baby burn
- 3:
- retl ! return
- st %g0, [%g6 + AOFF_task_thread + AOFF_thread_w_saved] ! no windows saved
- .align 4
- .globl C_LABEL(restore_current)
- C_LABEL(restore_current):
- LOAD_CURRENT(g6, o0)
- retl
- nop
- #ifdef CONFIG_PCI
- #include <asm/pcic.h>
- .align 4
- .globl linux_trap_ipi15_pcic
- linux_trap_ipi15_pcic:
- rd %wim, %l3
- SAVE_ALL
- /*
- * First deactivate NMI
- * or we cannot drop ET, cannot get window spill traps.
- * The busy loop is necessary because the PIO error
- * sometimes does not go away quickly and we trap again.
- */
- sethi %hi(C_LABEL(pcic_regs)), %o1
- ld [%o1 + %lo(C_LABEL(pcic_regs))], %o2
- ! Get pending status for printouts later.
- ld [%o2 + PCI_SYS_INT_PENDING], %o0
- mov PCI_SYS_INT_PENDING_CLEAR_ALL, %o1
- stb %o1, [%o2 + PCI_SYS_INT_PENDING_CLEAR]
- 1:
- ld [%o2 + PCI_SYS_INT_PENDING], %o1
- andcc %o1, ((PCI_SYS_INT_PENDING_PIO|PCI_SYS_INT_PENDING_PCI)>>24), %g0
- bne 1b
- nop
- or %l0, PSR_PIL, %l4
- wr %l4, 0x0, %psr
- WRITE_PAUSE
- wr %l4, PSR_ET, %psr
- WRITE_PAUSE
- call C_LABEL(pcic_nmi)
- add %sp, REGWIN_SZ, %o1 ! struct pt_regs *regs
- RESTORE_ALL
- .globl C_LABEL(pcic_nmi_trap_patch)
- C_LABEL(pcic_nmi_trap_patch):
- sethi %hi(linux_trap_ipi15_pcic), %l3
- jmpl %l3 + %lo(linux_trap_ipi15_pcic), %g0
- rd %psr, %l0
- .word 0
- #endif /* CONFIG_PCI */
- /* End of entry.S */