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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [sparc/] [kernel/] [entry.S] - Rev 199
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/* $Id: entry.S,v 1.1.1.1 2001-09-10 07:44:02 simons Exp $
* arch/sparc/kernel/entry.S: Sparc trap low-level entry points.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#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>
#include <asm/winmacro.h>
#include <asm/signal.h>
#include <asm/asmmacro.h>
#define NR_SYSCALLS 255 /* 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
ENTER_SYSCALL
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
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, l0, l2)
wr %l0, 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, l1, l2, l3)
RESTORE_ALL
#ifdef CONFIG_BLK_DEV_FD
#ifdef TRACE_FLOPPY_HARDINT
/* Useful tracing */
.data
.align 4
.globl C_LABEL(floppy_hardint_trace)
C_LABEL(floppy_hardint_trace):
.skip 32
.globl C_LABEL(floppy_hardint_index)
C_LABEL(floppy_hardint_index):
.word 0
#endif
.text
.align 4
.globl C_LABEL(floppy_hardint)
C_LABEL(floppy_hardint):
/* Can only use regs %l3->%l7:
* %l3 -- base address of fdc registers
* %l4 -- pdma_vaddr
* %l5 -- scratch for ld/st address
* %l6 -- pdma_size
* %l7 -- floppy_softint
*/
#ifdef TRACE_FLOPPY_HARDINT
sethi %hi(C_LABEL(floppy_hardint_trace)), %l5
or %l5, %lo(C_LABEL(floppy_hardint_trace)), %l5
ld [%l5 + 32], %l7
add %l7, 1, %l7
and %l7, 31, %l7
st %l7, [%l5 + 32]
sub %l7, 1, %l7
and %l7, 31, %l7
add %l7, %l5, %l5
or %g0, 0xf, %l7
stb %l7, [%l5]
#endif
/* Do we have work to do? */
sethi %hi(C_LABEL(doing_pdma)), %l4
ld [%l4 + %lo(C_LABEL(doing_pdma))], %l4
cmp %l4, 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:
#ifdef TRACE_FLOPPY_HARDINT
sethi %hi(C_LABEL(floppy_hardint_trace)), %l5
or %l5, %lo(C_LABEL(floppy_hardint_trace)), %l5
ld [%l5 + 32], %l7
add %l7, 1, %l7
and %l7, 31, %l7
st %l7, [%l5 + 32]
sub %l7, 1, %l7
and %l7, 31, %l7
add %l7, %l5, %l5
ldub [%l3], %l7
stb %l7, [%l5]
#else
ldub [%l3], %l7
#endif
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), %l4
ld [%l4], %l4
set C_LABEL(sparc_cpu_model), %l5
ld [%l5], %l5
subcc %l5, 1, %g0 /* enum { sun4c = 1 }; */
be 1f
ldub [%l4], %l5
or %l5, 0xc2, %l5
stb %l5, [%l4]
andn %l5, 0x02, %l5
b 2f
nop
1:
or %l5, 0xf4, %l5
stb %l5, [%l4]
andn %l5, 0x04, %l5
2:
/* Kill some time so the bits set */
WRITE_PAUSE
WRITE_PAUSE
stb %l5, [%l4]
/* Prevent recursion */
sethi %hi(C_LABEL(doing_pdma)), %l4
b floppy_dosoftint
st %g0, [%l4 + %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)), %l4
st %g0, [%l4 + %lo(C_LABEL(doing_pdma))]
/* fall through... */
floppy_dosoftint:
rd %wim, %l3
SAVE_ALL
ENTER_IRQ
/* Set all IRQs off. */
or %l0, PSR_PIL, %l4
wr %l4, 0x0, %psr
wr %l4, PSR_ET, %psr
WRITE_PAUSE
mov 11, %o0 ! floppy irq level
call C_LABEL(floppy_interrupt)
add %sp, REGWIN_SZ, %o1 ! struct pt_regs *regs
LEAVE_IRQ
RESTORE_ALL
#endif /* (CONFIG_BLK_DEV_FD) */
/* Bad trap handler */
.globl bad_trap_handler
bad_trap_handler:
SAVE_ALL
ENTER_SYSCALL
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
real_irq_entry:
SAVE_ALL
#ifdef __SMP__
cmp %l7, 9
bne 1f
nop
GET_PROCESSOR_MID(l4, l5)
set C_LABEL(sun4m_interrupts), %l5
ld [%l5], %l5
sethi %hi(0x02000000), %l6
sll %l4, 12, %l4
add %l5, %l4, %l5
ld [%l5], %l4
andcc %l4, %l6, %g0
be 1f
nop
b linux_trap_ipi9_sun4m
nop
1:
#endif
ENTER_IRQ
#ifdef __SMP__
cmp %l7, 13
bne 1f
nop
/* This is where we catch the level 13 reschedule soft-IRQ. */
GET_PROCESSOR_MID(o3, o2)
set C_LABEL(sun4m_interrupts), %l5
ld [%l5], %o5
sethi %hi(0x20000000), %o4
sll %o3, 12, %o3
add %o5, %o3, %o5
ld [%o5], %o1 ! read processor irq pending reg
andcc %o1, %o4, %g0
be 1f
nop
b linux_trap_ipi13_sun4m
nop
1:
#endif
/* start atomic operation with respect to software interrupts */
sethi %hi(C_LABEL(intr_count)), %l4
ld [%l4 + %lo(C_LABEL(intr_count))], %l5
add %l5, 0x1, %l5
st %l5, [%l4 + %lo(C_LABEL(intr_count))]
/* Enable traps w/IRQs off, so we can call c-code properly.
* Note how we are increasing PIL so we need to do two writes
* to work around a MicroSPARC bug of sorts.
*/
or %l0, PSR_PIL, %l4
wr %l4, 0x0, %psr
WRITE_PAUSE
wr %l4, PSR_ET, %psr
WRITE_PAUSE
mov %l7, %o0 ! irq level
call C_LABEL(handler_irq)
add %sp, REGWIN_SZ, %o1 ! pt_regs ptr
rie_checkbh:
sethi %hi(C_LABEL(intr_count)), %l4
ld [%l4 + %lo(C_LABEL(intr_count))], %l5
subcc %l5, 0x1, %l5
bne 2f /* IRQ within IRQ, get out of here... */
nop
sethi %hi(C_LABEL(bh_active)), %l3
ld [%l3 + %lo(C_LABEL(bh_active))], %g2
sethi %hi(C_LABEL(bh_mask)), %l3
ld [%l3 + %lo(C_LABEL(bh_mask))], %g3
andcc %g2, %g3, %g0
be 2f
nop
call C_LABEL(do_bottom_half)
nop
/* Try again... */
b rie_checkbh
nop
2:
st %l5, [%l4 + %lo(C_LABEL(intr_count))]
LEAVE_IRQ
RESTORE_ALL
/* This routine handles illegal instructions and privileged
* instruction attempts from user code.
*/
.align 4
.globl bad_instruction
bad_instruction:
SAVE_ALL
ENTER_SYSCALL
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
.align 4
.globl priv_instruction
priv_instruction:
SAVE_ALL
ENTER_SYSCALL
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:
SAVE_ALL
ENTER_SYSCALL
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_memaccess_unaligned)
mov %l0, %o3
RESTORE_ALL
/* This routine handles floating point disabled traps. */
.align 4
.globl fpd_trap_handler
fpd_trap_handler:
SAVE_ALL
ENTER_SYSCALL
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
ENTER_SYSCALL
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
ENTER_SYSCALL
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
ENTER_SYSCALL
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
ENTER_SYSCALL
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
ENTER_SYSCALL
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 Unimplemented FLUSH Exceptions. */
.align 4
.globl do_bad_flush
do_bad_flush:
SAVE_ALL
ENTER_SYSCALL
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_bad_flush)
mov %l0, %o3
RESTORE_ALL
/* This routine handles Co-Processor Exceptions. */
.align 4
.globl do_cp_exception
do_cp_exception:
SAVE_ALL
ENTER_SYSCALL
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
ENTER_SYSCALL
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
ENTER_SYSCALL
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
/* We get these for debugging routines using __builtin_return_address() */
dfw_kernel:
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 current %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
ENTER_SYSCALL
/* 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
#ifdef __SMP__
.align 4
.globl linux_trap_ipi9_sun4m
linux_trap_ipi9_sun4m:
sethi %hi(0x02000000), %o2
GET_PROCESSOR_MID(o0, o1)
set C_LABEL(sun4m_interrupts), %l5
ld [%l5], %o5
sll %o0, 12, %o0
add %o5, %o0, %o5
st %o2, [%o5 + 4]
WRITE_PAUSE
ld [%o5], %g0
WRITE_PAUSE
/* IRQ's off else we deadlock. */
or %l0, PSR_PIL, %l4
wr %l4, 0x0, %psr
WRITE_PAUSE
wr %l4, PSR_ET, %psr
WRITE_PAUSE
call C_LABEL(smp_message_irq)
nop
RESTORE_ALL_FASTIRQ
.align 4
.globl linux_trap_ipi13_sun4m
linux_trap_ipi13_sun4m:
/* NOTE: real_irq_entry saved state and grabbed klock already. */
/* start atomic operation with respect to software interrupts */
sethi %hi(C_LABEL(intr_count)), %l4
ld [%l4 + %lo(C_LABEL(intr_count))], %l5
add %l5, 0x1, %l5
st %l5, [%l4 + %lo(C_LABEL(intr_count))]
sethi %hi(0x20000000), %o2
GET_PROCESSOR_MID(o0, o1)
set C_LABEL(sun4m_interrupts), %l5
ld [%l5], %o5
sll %o0, 12, %o0
add %o5, %o0, %o5
st %o2, [%o5 + 4]
WRITE_PAUSE
ld [%o5], %g0
WRITE_PAUSE
/* IRQ's off else we deadlock. */
or %l0, PSR_PIL, %l4
wr %l4, 0x0, %psr
WRITE_PAUSE
wr %l4, PSR_ET, %psr
WRITE_PAUSE
call C_LABEL(smp_reschedule_irq)
nop
sethi %hi(C_LABEL(intr_count)), %l4
ld [%l4 + %lo(C_LABEL(intr_count))], %l5
sub %l5, 0x1, %l5
st %l5, [%l4 + %lo(C_LABEL(intr_count))]
LEAVE_IRQ
RESTORE_ALL
.align 4
.globl linux_trap_ipi15_sun4m
linux_trap_ipi15_sun4m:
SAVE_ALL
/* First check for hard NMI memory error. */
sethi %hi(0xf0000000), %o2
set C_LABEL(sun4m_interrupts), %l5
set 0x4000, %o3
ld [%l5], %l5
add %l5, %o3, %l5
ld [%l5], %l6
andcc %o2, %l6, %o2
be 1f
nop
/* Asynchronous fault, why you little ?!#&%@... */
sethi %hi(0x80000000), %o2
st %o2, [%l5 + 0xc]
WRITE_PAUSE
ld [%l5], %g0
WRITE_PAUSE
/* All interrupts are off... now safe to enable traps
* and call C-code.
*/
or %l0, PSR_PIL, %l4 ! I am very paranoid...
wr %l4, 0x0, %psr
WRITE_PAUSE
wr %l4, PSR_ET, %psr
WRITE_PAUSE
call C_LABEL(sun4m_nmi)
nop
sethi %hi(0x80000000), %o2
st %o2, [%l5 + 0x8]
WRITE_PAUSE
ld [%l5], %g0
WRITE_PAUSE
RESTORE_ALL_FASTIRQ
1:
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
st %o2, [%o5 + 4]
WRITE_PAUSE
ld [%o5], %g0
WRITE_PAUSE
/* IRQ's off else we deadlock. */
or %l0, PSR_PIL, %l4
wr %l4, 0x0, %psr
WRITE_PAUSE
wr %l4, PSR_ET, %psr
WRITE_PAUSE
call C_LABEL(smp_message_irq)
nop
RESTORE_ALL_FASTIRQ
#endif
.align 4
.globl sun4c_fault
sun4c_fault:
SAVE_ALL
ENTER_SYSCALL
/* XXX This needs to be scheduled better */
sethi %hi(AC_SYNC_ERR), %l4
add %l4, 0x4, %l5 ! AC_SYNC_VA in %l5
lda [%l5] ASI_CONTROL, %o3 /* Address */
lda [%l4] ASI_CONTROL, %l6
srl %l6, 15, %l6
and %l6, 1, %o2 /* Write? */
wr %l0, PSR_ET, %psr
WRITE_PAUSE
mov %l7, %o1 /* Text fault? */
call C_LABEL(do_sparc_fault)
add %sp, REGWIN_SZ, %o0 /* pt_regs */
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
ENTER_SYSCALL
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
/* 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):
ld [%sp + REGWIN_SZ + PT_I0], %g1
cmp %g1, NR_SYSCALLS
blu,a 1f
sll %g1, 0x2, %g1
set C_LABEL(sunos_nosys), %l6
b 2f
nop
1:
set C_LABEL(sunos_sys_table), %l7
ld [%l7 + %g1], %l6
2:
ld [%sp + REGWIN_SZ + PT_I1], %o0
ld [%sp + REGWIN_SZ + PT_I2], %o1
ld [%sp + REGWIN_SZ + PT_I3], %o2
mov %o7, %l5
ld [%sp + REGWIN_SZ + PT_I4], %o3
call %l6
ld [%sp + REGWIN_SZ + PT_I5], %o4
jmp %l5 + 0x8 /* so stupid... */
nop
/* Note how we really return to ret_syscall because we share the
* register window with our caller.
*/
.align 4
.globl C_LABEL(sys_ptrace)
C_LABEL(sys_ptrace):
call C_LABEL(do_ptrace)
add %sp, REGWIN_SZ, %o0
LOAD_CURRENT(l4, l5)
ld [%l4 + 0x14], %l5
andcc %l5, 0x20, %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
call C_LABEL(sparc_execve)
add %sp, REGWIN_SZ, %o0 ! pt_regs *regs arg
jmp %l5 + 0x8
nop
.align 4
.globl C_LABEL(sys_pipe)
C_LABEL(sys_pipe):
mov %o7, %l5
call C_LABEL(sparc_pipe)
add %sp, REGWIN_SZ, %o0 ! pt_regs *regs arg
jmp %l5 + 0x8
nop
.align 4
.globl C_LABEL(sys_sigpause)
C_LABEL(sys_sigpause):
ld [%sp + REGWIN_SZ + PT_I0], %o0
call C_LABEL(do_sigpause)
add %sp, REGWIN_SZ, %o1
LOAD_CURRENT(l4, l5)
ld [%l4 + 0x14], %l5
andcc %l5, 0x20, %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
LOAD_CURRENT(l4, l5)
ld [%l4 + 0x14], %l5
andcc %l5, 0x20, %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
LOAD_CURRENT(l4, l5)
ld [%l4 + 0x14], %l5
andcc %l5, 0x20, %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
/* 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_clone() instead.
*/
.align 4
.globl C_LABEL(sys_fork), C_LABEL(sys_vfork)
C_LABEL(sys_vfork):
C_LABEL(sys_fork):
mov %o7, %l5
/* Save the kernel state as of now. */
FLUSH_ALL_KERNEL_WINDOWS;
STORE_WINDOW(sp)
LOAD_CURRENT(g6, g5)
rd %psr, %g4
rd %wim, %g5
std %g4, [%g6 + THREAD_FORK_KPSR]
mov SIGCHLD, %o0 ! arg0: clone flags
ld [%sp + REGWIN_SZ + PT_FP], %o1 ! arg1: usp
call C_LABEL(do_fork)
add %sp, REGWIN_SZ, %o2 ! arg2: pt_regs ptr
jmp %l5 + 0x8
nop
/* Whee, kernel threads! */
.globl C_LABEL(sys_clone)
C_LABEL(sys_clone):
mov %o7, %l5
/* Save the kernel state as of now. */
FLUSH_ALL_KERNEL_WINDOWS;
STORE_WINDOW(sp)
LOAD_CURRENT(g6, g5)
rd %psr, %g4
rd %wim, %g5
std %g4, [%g6 + THREAD_FORK_KPSR]
ldd [%sp + REGWIN_SZ + PT_I0], %o0 ! arg0,1: flags,usp
cmp %o1, 0x0 ! Is new_usp NULL?
be,a 1f
ld [%sp + REGWIN_SZ + PT_FP], %o1 ! yes, use current usp
1:
call C_LABEL(do_fork)
add %sp, REGWIN_SZ, %o2 ! arg2: pt_regs ptr
jmp %l5 + 0x8
nop
/* Linux native and SunOS system calls enter here... */
.align 4
.globl linux_sparc_syscall
linux_sparc_syscall:
/* While we are here trying to optimize our lives
* away, handle the easy bogus cases like a
* ni_syscall or sysnum > NR_SYSCALLS etc.
* In the cases where we cannot optimize the
* call inline we don't really lose anything
* performance wise because we are doing here
* things which we did anyway in the original
* routine. The only added complexity is a
* bit test, compare, and branch to decide
* if we need to save process state or not.
*/
/* XXX TODO: When we have ptrace working test
* XXX test for PF_TRACESYS in task flags.
*/
/* 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 syscall_is_too_hard
nop
1:
ld [%l7 + %l4], %l7
/* If bit-1 is set, this is a "fast" syscall.
* This is the _complete_ overhead of this optimization,
* and we save ourselves a load, so it evens out to nothing.
*/
andcc %l7, 0x1, %g0
be syscall_is_too_hard
andn %l7, 0x1, %l7
jmpl %l7, %g0
nop
.globl syscall_is_too_hard
syscall_is_too_hard:
rd %wim, %l3
SAVE_ALL
ENTER_SYSCALL
wr %l0, PSR_ET, %psr
WRITE_PAUSE
LOAD_CURRENT(l4, l5)
ld [%l4 + 0x14], %l5
andcc %l5, 0x20, %g0
be 2f
nop
call C_LABEL(syscall_trace)
nop
2:
ldd [%sp + REGWIN_SZ + PT_I0], %o0
st %o0, [%sp + REGWIN_SZ + PT_G0] ! for restarting syscalls
ldd [%sp + REGWIN_SZ + PT_I2], %o2
call %l7
ldd [%sp + REGWIN_SZ + PT_I4], %o4
st %o0, [%sp + REGWIN_SZ + PT_I0]
.globl C_LABEL(ret_sys_call)
C_LABEL(ret_sys_call):
ld [%sp + REGWIN_SZ + PT_I0], %o0
set PSR_C, %l6
cmp %o0, -ENOIOCTLCMD
bgeu 1f
ld [%sp + REGWIN_SZ + PT_PSR], %l5
/* System call success, clear Carry condition code. */
andn %l5, %l6, %l5
b 2f
st %l5, [%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
st %o0, [%sp + REGWIN_SZ + PT_I0]
or %l5, %l6, %l5
st %l5, [%sp + REGWIN_SZ + PT_PSR]
2:
LOAD_CURRENT(l4, l5)
ld [%l4 + 0x14], %l5
andcc %l5, 0x20, %g0
be 3f
nop
call C_LABEL(syscall_trace)
nop
/* Advance the pc and npc over the trap instruction. */
3:
ld [%sp + REGWIN_SZ + PT_NPC], %l1 /* pc = npc */
add %l1, 0x4, %l2 /* npc = npc+4 */
st %l1, [%sp + REGWIN_SZ + PT_PC]
st %l2, [%sp + REGWIN_SZ + PT_NPC]
RESTORE_ALL
/* Solaris system calls enter here... */
.align 4
.globl solaris_syscall
solaris_syscall:
/* While we are here trying to optimize our lives
* away, handle the easy bogus cases like a
* ni_syscall or sysnum > NR_SYSCALLS etc.
* In the cases where we cannot optimize the
* call inline we don't really lose anything
* performance wise because we are doing here
* things which we did anyway in the original
* routine. The only added complexity is a
* bit test, compare, and branch to decide
* if we need to save process state or not.
*/
/* XXX TODO: When we have ptrace working test
* XXX test for PF_TRACESYS in task flags.
*/
/* 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 solaris_is_too_hard
nop
1:
ld [%l7 + %l4], %l7
/* If bit-1 is set, this is a "fast" syscall.
* This is the _complete_ overhead of this optimization,
* and we save ourselves a load, so it evens out to nothing.
*/
andcc %l7, 0x1, %g0
be solaris_is_too_hard
andn %l7, 0x1, %l7
jmpl %l7, %g0
nop
.globl solaris_is_too_hard
solaris_is_too_hard:
rd %wim, %l3
SAVE_ALL
ENTER_SYSCALL
wr %l0, PSR_ET, %psr
WRITE_PAUSE
2:
ldd [%sp + REGWIN_SZ + PT_I0], %o0
st %o0, [%sp + REGWIN_SZ + PT_G0] ! for restarting syscalls
ldd [%sp + REGWIN_SZ + PT_I2], %o2
call %l7
ldd [%sp + REGWIN_SZ + PT_I4], %o4
st %o0, [%sp + REGWIN_SZ + PT_I0]
set PSR_C, %l6
cmp %o0, -ENOIOCTLCMD
bgeu 1f
ld [%sp + REGWIN_SZ + PT_PSR], %l5
/* System call success, clear Carry condition code. */
andn %l5, %l6, %l5
b 2f
st %l5, [%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
sethi %hi(C_LABEL(solaris_xlatb_rorl)), %o3
or %o3, %lo(C_LABEL(solaris_xlatb_rorl)), %o3
sll %o0, 2, %o0
ld [%o3 + %o0], %o0
st %o0, [%sp + REGWIN_SZ + PT_I0]
or %l5, %l6, %l5
st %l5, [%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]
st %l2, [%sp + REGWIN_SZ + PT_NPC]
RESTORE_ALL
/* {net, open}bsd system calls enter here... */
.align 4
.globl bsd_syscall
bsd_syscall:
/* While we are here trying to optimize our lives
* away, handle the easy bogus cases like a
* ni_syscall or sysnum > NR_SYSCALLS etc.
* In the cases where we cannot optimize the
* call inline we don't really lose anything
* performance wise because we are doing here
* things which we did anyway in the original
* routine. The only added complexity is a
* bit test, compare, and branch to decide
* if we need to save process state or not.
*/
/* XXX TODO: When we have ptrace working test
* XXX test for PF_TRACESYS in task flags.
*/
/* 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
/* If bit-1 is set, this is a "fast" syscall.
* This is the _complete_ overhead of this optimization,
* and we save ourselves a load, so it evens out to nothing.
*/
andcc %l7, 0x1, %g0
be bsd_is_too_hard
andn %l7, 0x1, %l7
jmpl %l7, %g0
nop
.globl bsd_is_too_hard
bsd_is_too_hard:
rd %wim, %l3
SAVE_ALL
ENTER_SYSCALL
wr %l0, PSR_ET, %psr
WRITE_PAUSE
2:
ldd [%sp + REGWIN_SZ + PT_I0], %o0
st %o0, [%sp + REGWIN_SZ + PT_G0] ! for restarting syscalls
ldd [%sp + REGWIN_SZ + PT_I2], %o2
call %l7
ldd [%sp + REGWIN_SZ + PT_I4], %o4
st %o0, [%sp + REGWIN_SZ + PT_I0]
set PSR_C, %l6
cmp %o0, -ENOIOCTLCMD
bgeu 1f
ld [%sp + REGWIN_SZ + PT_PSR], %l5
/* System call success, clear Carry condition code. */
andn %l5, %l6, %l5
b 2f
st %l5, [%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
st %o0, [%sp + REGWIN_SZ + PT_I0]
or %l5, %l6, %l5
st %l5, [%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]
st %l2, [%sp + REGWIN_SZ + PT_NPC]
RESTORE_ALL
/* 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 __SMP__
sethi %hi(C_LABEL(loops_per_sec)), %o3
call .umul
ld [%o3 + %lo(C_LABEL(loops_per_sec))], %o1
#else
GET_PROCESSOR_OFFSET(o4)
set C_LABEL(cpu_data), %o3
call .umul
ld [%o3 + %o4], %o1
#endif
cmp %o1, 0x0
1:
bne 1b
subcc %o1, 1, %o1
ret
restore
/* End of entry.S */
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